/* ==========================================================================
   Twitter Character Counter - Design System & Styles
   Clean, modern, ultra-fast, responsive, dark/dim/light theme engine
   ========================================================================== */

/* Local Font Loading & Swap Modifier */
@supports (font-display: swap) {
  @font-face {
    font-family: 'Geist';
    font-style: normal;
    font-weight: 400 700;
    font-display: swap;
    src: local('Geist'), local('Inter'), local('Segoe UI'), local('Roboto'), local('Helvetica Neue'), sans-serif;
  }
}

:root,
[data-theme="light"] {
  /* Vercel Geist Light Theme */
  --bg-primary: #fafafa;
  --bg-secondary: #f2f2f2;
  --bg-card: #ffffff;
  --bg-card-hover: #fafafa;
  --bg-input: #ffffff;
  --bg-input-focus: #ffffff;
  --bg-subtle: #f5f5f5;
  --bg-hover: rgba(0, 0, 0, 0.04);
  --border-color: #ebebeb;
  --border-color-strong: rgba(0, 0, 0, 0.25);
  --border-focus: #171717;

  /* Typography Colors */
  --text-primary: #171717;
  --text-secondary: #4d4d4d;
  --text-muted: #8f8f8f;
  --text-faint: #a1a1a1;
  --text-inverted: #ffffff;

  /* Accent Colors */
  --accent-x: #171717;
  --accent-x-hover: #000000;
  --accent-x-subtle: rgba(23, 23, 23, 0.05);
  --accent-blue: #0070f3;
  --accent-blue-deep: #0761d1;
  --accent-blue-soft: #d3e5ff;
  --accent-sunset: #f5a623;
  --accent-green: #10b981;
  --accent-green-subtle: rgba(16, 185, 129, 0.1);
  --accent-gold: #f5a623;
  --accent-red: #ee0000;
  --accent-red-subtle: rgba(238, 0, 0, 0.1);

  /* Vercel Crisp Shadows & Hairlines */
  --shadow-button-dark: 0 0 0 1px #171717, 0 1px 2px rgba(0, 0, 0, 0.08);
  --shadow-button-light: 0 0 0 1px #ebebeb, 0 1px 2px rgba(0, 0, 0, 0.04);
  --glow-accent: rgba(0, 112, 243, 0.12) 0px 4px 16px;
  --glow-card: none;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.08);
  --glass-blur: blur(16px);

  /* Geometry & Fonts */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-pill: 100px;
  --radius-full: 9999px;
  --font-main: "Geist", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: "Geist Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  --transition-fast: 0.12s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-smooth: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.175, 0.885, 0.32, 1.275);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --container-max: 1060px;
}

/* Dark Theme - Vercel Pure Obsidian */
[data-theme="dark"] {
  --bg-primary: #000000;
  --bg-secondary: #0a0a0a;
  --bg-card: #0a0a0a;
  --bg-card-hover: #141414;
  --bg-input: #0a0a0a;
  --bg-input-focus: #111111;
  --bg-subtle: #111111;
  --bg-hover: rgba(255, 255, 255, 0.08);
  --border-color: #242424;
  --border-color-strong: rgba(255, 255, 255, 0.3);
  --border-focus: #ededed;
  --text-primary: #ededed;
  --text-secondary: #a1a1a1;
  --text-muted: #707070;
  --text-faint: #505050;
  --text-inverted: #000000;
  --accent-x: #ededed;
  --accent-x-hover: #ffffff;
  --accent-x-subtle: rgba(255, 255, 255, 0.08);
  --accent-blue: #0070f3;
  --accent-blue-deep: #3291ff;
  --shadow-button-dark: 0 0 0 1px #ededed, 0 1px 3px rgba(0, 0, 0, 0.4);
  --shadow-button-light: 0 0 0 1px #242424;
  --glow-accent: rgba(0, 112, 243, 0.2) 0px 4px 20px;
  --glow-card: none;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 14px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 10px 28px rgba(0, 0, 0, 0.6);
}

/* Dim Theme - Vercel Deep Charcoal */
[data-theme="dim"] {
  --bg-primary: #0c0d0e;
  --bg-secondary: #141618;
  --bg-card: #141618;
  --bg-card-hover: #1c1e22;
  --bg-input: #111315;
  --bg-input-focus: #181a1d;
  --bg-subtle: #181a1d;
  --bg-hover: rgba(255, 255, 255, 0.07);
  --border-color: #26292d;
  --border-color-strong: rgba(255, 255, 255, 0.25);
  --border-focus: #ededed;
  --text-primary: #ededed;
  --text-secondary: #9da3af;
  --text-muted: #6b7280;
  --text-faint: #4b5260;
  --shadow-button-dark: 0 0 0 1px #ededed;
  --glow-card: none;
  --shadow-lg: 0 10px 28px rgba(0, 0, 0, 0.5);
}

/* Reset & Defaults */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

/* Accessible Anchor Scroll Margin (Web Interface Guidelines) */
[id] {
  scroll-margin-top: 80px;
}

/* Skip Link for Keyboard Navigation */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  padding: 0.5rem 1rem;
  background: var(--text-primary);
  color: var(--text-inverted) !important;
  font-weight: 700;
  font-size: 0.85rem;
  border-radius: var(--radius-sm);
  z-index: 99999;
  text-decoration: none;
  transform: translateY(-200%);
  opacity: 0;
  pointer-events: none;
  transition: transform var(--transition-fast), opacity var(--transition-fast), top var(--transition-fast);
}

.skip-link:focus,
.skip-link:focus-visible {
  top: 1rem;
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
  outline: 2px solid var(--accent-blue);
  outline-offset: 2px;
}

body {
  font-family: var(--font-main);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  transition: background-color var(--transition-smooth), color var(--transition-smooth);
}

/* Ambient Radial Glow - Disabled for Flat Clean Minimalist Design */
.ambient-glow {
  display: none;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.25rem;
  position: relative;
  z-index: 1;
}

/* Typography Base - Tight Editorial Rhythm & Balanced Headings */
h1, h2, h3, h4 {
  color: var(--text-primary);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.22;
  text-wrap: balance;
}

/* Tabular Numerics for Real-Time Counters & Metrics (Eliminates Text Jitter) */
.primary-count-num,
.primary-count,
.count-readout,
.metric-val,
.metric-value,
.stat-big-num,
.meter-center-val,
.thread-card-count {
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum";
}

/* Universal Accessible Focus Rings */
:focus-visible {
  outline: 2px solid var(--accent-blue);
  outline-offset: 2px;
}

a {
  color: var(--accent-x);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  text-decoration: underline;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  user-select: none;
}

/* Reduced Motion Compliance */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ==========================================================================
   MINIMALIST HEADER & NAVIGATION
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: rgba(250, 250, 250, 0.85);
  border-bottom: 1px solid var(--border-color);
  transition: background-color var(--transition-smooth), border-color var(--transition-smooth);
}

[data-theme="dark"] .site-header {
  background: rgba(0, 0, 0, 0.85);
}
[data-theme="dim"] .site-header {
  background: rgba(12, 13, 14, 0.88);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
  gap: 1rem;
}

/* Brand Logo */
.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.94rem;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: -0.02em;
  flex-shrink: 0;
  transition: opacity var(--transition-fast);
}

.brand-logo:hover {
  text-decoration: none;
  opacity: 0.8;
}

.brand-logo-x {
  fill: currentColor;
  flex-shrink: 0;
}

.brand-text {
  font-size: 0.94rem;
  font-weight: 700;
  color: var(--text-primary);
  white-space: nowrap;
}

/* Desktop Navigation */
.desktop-nav {
  display: none;
  align-items: center;
  gap: 0.25rem;
  margin-left: 0.5rem;
}

@media (min-width: 900px) {
  .desktop-nav {
    display: flex;
  }
}

.desktop-nav .nav-link {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  padding: 0.32rem 0.65rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.desktop-nav .nav-link:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
  text-decoration: none;
}

.desktop-nav .nav-link.active {
  background: var(--text-primary);
  color: var(--text-inverted) !important;
  font-weight: 600;
  box-shadow: var(--shadow-button-dark);
}

/* Header Actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: auto;
  flex-shrink: 0;
}

.btn-header-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  background: var(--text-primary);
  color: var(--text-inverted) !important;
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-sm);
  text-decoration: none;
  box-shadow: var(--shadow-button-dark);
  transition: transform 0.12s var(--ease-spring), opacity var(--transition-fast);
  white-space: nowrap;
}

.btn-header-cta:hover {
  opacity: 0.88;
  text-decoration: none;
}

.btn-header-cta:active {
  transform: scale(0.97);
  opacity: 0.8;
}

/* Language Selector Dropdown */
.lang-selector {
  position: relative;
}

.lang-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  background: transparent;
  border: 1px solid var(--border-color);
  padding: 0.32rem 0.55rem;
  border-radius: var(--radius-full);
  font-size: 0.76rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: transform 0.12s var(--ease-spring), color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
}

.lang-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-focus);
  background: var(--bg-hover);
}

.lang-btn:active {
  transform: scale(0.95);
}

.lang-cur-code {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.lang-caret {
  transition: transform var(--transition-fast);
}

.lang-btn[aria-expanded="true"] .lang-caret {
  transform: rotate(180deg);
}

.lang-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  width: 155px;
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.35rem;
  box-shadow: var(--shadow-lg);
  display: none;
  flex-direction: column;
  gap: 2px;
  z-index: 1000;
}

.lang-dropdown.show {
  display: flex;
}

.lang-option {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.55rem;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.lang-option:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  text-decoration: none;
}

.lang-option.active {
  background: rgba(29, 155, 240, 0.12);
  color: var(--accent-x);
  font-weight: 700;
}

/* Minimalist Single Theme Toggle Button */
.theme-toggle-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  padding: 0;
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  color: var(--text-secondary);
  cursor: pointer;
  transition: transform 0.12s var(--ease-spring), color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
}

.theme-toggle-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-focus);
  background: var(--bg-hover);
}

.theme-toggle-btn:active {
  transform: scale(0.92);
}

.theme-icon-dark, .theme-icon-light {
  display: none;
}

[data-theme="dark"] .theme-icon-light,
[data-theme="dim"] .theme-icon-light {
  display: block;
}

[data-theme="light"] .theme-icon-dark {
  display: block;
}

/* Mobile Hamburger Toggle */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 4px;
  width: 36px;
  height: 36px;
  padding: 6px;
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  cursor: pointer;
  transition: transform 0.12s var(--ease-spring), background var(--transition-fast), border-color var(--transition-fast);
}

.mobile-menu-toggle:active {
  transform: scale(0.92);
}

@media (max-width: 959px) {
  .mobile-menu-toggle {
    display: flex;
  }
}

.hamburger-bar {
  width: 18px;
  height: 2px;
  background-color: currentColor;
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger-bar:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}
.mobile-menu-toggle[aria-expanded="true"] .hamburger-bar:nth-child(2) {
  opacity: 0;
}
.mobile-menu-toggle[aria-expanded="true"] .hamburger-bar:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* ==========================================================================
   MOBILE NAVIGATION DRAWER & ACCESSIBLE OVERLAY (Requirements 109-113)
   ========================================================================== */

/* Prevent scroll when drawer is open */
body.drawer-open {
  overflow: hidden !important;
  touch-action: none;
}

/* Backdrop Overlay */
.mobile-drawer-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 1999;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s cubic-bezier(0.16, 1, 0.3, 1), visibility 0.25s;
}

.mobile-drawer-backdrop.open {
  opacity: 1;
  visibility: visible;
}

/* Accessible Slide-In Side Drawer */
.mobile-drawer {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(85vw, 360px);
  height: 100%;
  height: 100dvh;
  background: var(--bg-primary);
  border-left: 1px solid var(--border-color);
  box-shadow: -8px 0 32px rgba(0, 0, 0, 0.5);
  z-index: 2000;
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  visibility: hidden;
  pointer-events: none;
  transition: transform 0.28s cubic-bezier(0.16, 1, 0.3, 1), visibility 0.28s;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  outline: none;
}

.mobile-drawer.open {
  transform: translateX(0);
  visibility: visible;
  pointer-events: auto;
}

/* Drawer Header */
.mobile-drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 1.15rem;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-card);
  position: sticky;
  top: 0;
  z-index: 10;
  flex-shrink: 0;
}

.mobile-drawer-close {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  min-width: 44px;
  min-height: 44px;
  border-radius: var(--radius-full);
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.mobile-drawer-close:hover,
.mobile-drawer-close:focus-visible {
  background: var(--bg-hover);
  border-color: var(--accent-x);
  color: var(--accent-x);
  outline: 2px solid var(--accent-x);
}

.mobile-drawer-close:active {
  transform: scale(0.92);
}

/* Drawer Inner Body */
.mobile-drawer-inner {
  padding: 1.15rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  flex: 1;
}

/* Drawer Prominent CTA (Thumb Friendly) */
.mobile-drawer-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  min-height: 48px;
  padding: 0.75rem 1rem;
  background: var(--accent-x);
  color: #ffffff !important;
  font-weight: 700;
  font-size: 0.95rem;
  border-radius: var(--radius-md);
  text-decoration: none;
  box-shadow: 0 4px 14px rgba(29, 155, 240, 0.35);
  transition: all var(--transition-fast);
}

.mobile-drawer-cta:hover,
.mobile-drawer-cta:focus-visible {
  opacity: 0.95;
  transform: translateY(-1px);
  text-decoration: none;
  outline: 2px solid #ffffff;
}

.mobile-drawer-cta:active {
  transform: scale(0.98);
}

.m-cta-icon {
  font-size: 1.15rem;
}

/* Thumb-Friendly Navigation Links (Requirement 110) */
.mobile-nav {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.mobile-nav-link {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  min-height: 48px;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-primary);
  text-decoration: none;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  transition: all var(--transition-fast);
}

.mobile-nav-link:hover,
.mobile-nav-link:focus-visible {
  background: var(--bg-hover);
  border-color: var(--accent-x);
  color: var(--accent-x);
  text-decoration: none;
  outline: 2px solid var(--accent-x);
}

.mobile-nav-link:active {
  transform: scale(0.98);
  background: var(--bg-hover);
}

.mobile-nav-link .m-icon {
  font-size: 1.15rem;
  flex-shrink: 0;
}

.mobile-nav-link .m-text {
  flex: 1;
  text-align: left;
}

.mobile-nav-link .m-chevron {
  color: var(--text-muted);
  flex-shrink: 0;
}

.mobile-drawer-divider {
  height: 1px;
  background: var(--border-color);
  margin: 0.15rem 0;
}

.mobile-drawer-section {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.mobile-drawer-label {
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

/* Mobile Language Grid */
.mobile-lang-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.45rem;
}

.mobile-lang-pill {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  min-height: 44px;
  padding: 0.5rem 0.65rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.mobile-lang-pill:hover,
.mobile-lang-pill:focus-visible {
  border-color: var(--border-focus);
  color: var(--text-primary);
  text-decoration: none;
  outline: 2px solid var(--accent-x);
}

.mobile-lang-pill.active {
  border-color: var(--accent-x);
  background: rgba(29, 155, 240, 0.12);
  color: var(--accent-x);
  font-weight: 700;
}

.mobile-lang-pill:active {
  transform: scale(0.96);
}

/* Mobile Theme Switcher */
.mobile-theme-switcher {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.45rem;
}

.m-theme-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  min-height: 44px;
  padding: 0.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.m-theme-btn:hover,
.m-theme-btn:focus-visible {
  border-color: var(--accent-x);
  color: var(--text-primary);
  outline: 2px solid var(--accent-x);
}

.m-theme-btn.active {
  border-color: var(--accent-x);
  background: rgba(29, 155, 240, 0.12);
  color: var(--accent-x);
  font-weight: 700;
}

.m-theme-btn:active {
  transform: scale(0.96);
}

/* ==========================================================================
   HERO & TOOL SECTION (Ultra Optimized for Immediate Above-the-Fold Visibility)
   ========================================================================== */
.hero-section {
  padding: 0.85rem 0 0.35rem;
  text-align: center;
}

@media (max-width: 640px) {
  .hero-section {
    padding: 0.5rem 0 0.2rem;
  }
}

.hero-title {
  font-size: clamp(1.6rem, 3.4vw, 2.35rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  margin-bottom: 0.25rem;
  color: var(--text-primary);
  line-height: 1.15;
}

.hero-subtitle {
  font-size: clamp(0.85rem, 1.6vw, 1.02rem);
  color: var(--text-secondary);
  max-width: 720px;
  margin: 0 auto;
  line-height: 1.4;
}

@media (max-width: 640px) {
  .hero-title {
    font-size: 1.45rem;
    margin-bottom: 0.15rem;
  }
  .hero-subtitle {
    font-size: 0.82rem;
    line-height: 1.35;
  }
}

/* ==========================================================================
   CORE TWITTER CHARACTER COUNTER TOOL
   ========================================================================== */
/* ==========================================================================
   2-COLUMN COMPOSER & LIVE 𝕏 POST PREVIEW ARCHITECTURE
   ========================================================================== */
.tool-section {
  margin: 0.85rem 0 3rem;
}

@media (max-width: 640px) {
  .tool-section {
    margin: 0.5rem 0 2rem;
  }
}

.composer-preview-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.95fr;
  gap: 1.5rem;
  align-items: start;
}

@media (max-width: 1023px) {
  .composer-preview-grid {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }
}

/* Card Base Structure */
.counter-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: border-color var(--transition-smooth), box-shadow var(--transition-smooth);
}

.composer-card {
  display: flex;
  flex-direction: column;
}

/* Card Header */
.tool-card-header {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-card);
  gap: 0.5rem;
}

.tool-title-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.composer-icon {
  color: var(--text-muted);
}

.tool-heading-text {
  font-weight: 700;
  font-size: 0.88rem;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.mode-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  background: var(--bg-hover);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  white-space: nowrap;
}

/* Composer Toolbar & Presets */
.preset-bar {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  margin-bottom: 0.85rem;
  overflow-x: auto;
  scrollbar-width: none;
  padding: 2px 0;
}

.preset-bar::-webkit-scrollbar {
  display: none;
}

.composer-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.55rem 0.85rem;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-card);
  flex-wrap: wrap;
}

.preset-pills-group {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  overflow-x: auto;
  scrollbar-width: none;
}

.preset-pills-group::-webkit-scrollbar {
  display: none;
}

.preset-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.3rem 0.65rem;
  border-radius: var(--radius-sm);
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-secondary);
  font-size: 0.78rem;
  font-weight: 500;
  white-space: nowrap;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.preset-pill:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.preset-pill.active {
  background: var(--bg-hover);
  border-color: var(--border-color-strong);
  color: var(--text-primary);
  font-weight: 600;
}

.toolbar-actions-group {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  margin-left: auto;
}

.btn-tool {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.32rem 0.65rem;
  font-size: 0.78rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-tool:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
  border-color: var(--border-color-strong);
}

.btn-tool:active {
  transform: scale(0.96);
}

/* Textarea & Highlights Container */
.editor-container {
  position: relative;
  min-height: 180px;
  background: var(--bg-card);
}

.composer-card:focus-within,
.counter-card:focus-within {
  border-color: var(--border-color-strong);
}

.editor-backdrop {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 1rem 1.15rem;
  overflow: hidden;
  pointer-events: none;
  z-index: 1;
}

.editor-highlights {
  font-family: var(--font-main);
  font-size: 1.05rem;
  line-height: 1.55;
  color: transparent;
  white-space: pre-wrap;
  word-break: break-word;
}

.highlight-overflow {
  background-color: rgba(239, 68, 68, 0.25);
  color: transparent;
  border-radius: 3px;
  box-shadow: 0 0 0 1px rgba(239, 68, 68, 0.45);
}

.tweet-textarea {
  position: relative;
  z-index: 2;
  width: 100%;
  min-height: 180px;
  background: transparent;
  color: var(--text-primary);
  font-family: var(--font-main);
  font-size: 1.05rem;
  line-height: 1.55;
  padding: 1rem 1.15rem;
  border: none;
  resize: vertical;
  outline: none;
}

.tweet-textarea::placeholder {
  color: var(--text-muted);
}

/* Floating Smart Suggestion Indicator */
.smart-suggestion-pill {
  position: absolute;
  right: 1rem;
  bottom: 1rem;
  z-index: 5;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.25rem 0.55rem;
  border-radius: var(--radius-full);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-md);
  cursor: pointer;
  color: var(--accent-sunset);
  font-size: 0.74rem;
  font-weight: 700;
  transition: transform 0.12s var(--ease-spring);
}

.smart-suggestion-pill:hover {
  transform: scale(1.05);
}

/* Composer Card Footer */
.composer-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.65rem 1rem;
  border-top: 1px solid var(--border-color);
  background: var(--bg-card);
  gap: 0.75rem;
  flex-wrap: wrap;
}

.footer-count-group {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

/* Counter Banner (Subpage Dedicated Tools) */
.counter-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.15rem;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-card);
  gap: 1rem;
  flex-wrap: wrap;
}

.counter-main-group {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

/* Meter Wrapper & SVG Progress Ring (Universal sizing for home & subpages) */
.meter-wrapper,
.meter-wrapper-sm {
  position: relative;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.meter-wrapper .circular-meter,
.meter-wrapper-sm .circular-meter {
  transform: rotate(-90deg);
  width: 32px !important;
  height: 32px !important;
  max-width: 32px !important;
  max-height: 32px !important;
  display: block;
}

.meter-wrapper .meter-bg,
.meter-wrapper-sm .meter-bg {
  stroke: var(--bg-hover);
  stroke-width: 5;
}

.meter-wrapper .meter-progress,
.meter-wrapper-sm .meter-progress {
  stroke: var(--text-primary);
  stroke-width: 5;
  stroke-linecap: round;
  stroke-dasharray: 175.9;
  stroke-dashoffset: 175.9;
  transition: stroke-dashoffset 0.2s var(--ease-out), stroke 0.2s ease;
}

.meter-wrapper-sm {
  width: 28px;
  height: 28px;
}

.meter-wrapper-sm .circular-meter {
  width: 28px !important;
  height: 28px !important;
  max-width: 28px !important;
  max-height: 28px !important;
}

.counter-text-block {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.count-numbers-row {
  display: flex;
  align-items: baseline;
  gap: 0.35rem;
  font-family: var(--font-mono);
}

.primary-count {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  line-height: 1.1;
}

.count-divider {
  font-size: 0.82rem;
  color: var(--text-muted);
  font-weight: 500;
}

.remaining-status {
  font-size: 0.78rem;
  font-weight: 600;
}

.banner-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: auto;
}

.btn-copy-main {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.45rem 1rem;
  font-size: 0.82rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  background: var(--text-primary);
  color: var(--text-inverted) !important;
  border: none;
  cursor: pointer;
  box-shadow: var(--shadow-button-dark);
  transition: transform 0.12s var(--ease-spring), opacity var(--transition-fast);
}

.btn-copy-main:hover {
  opacity: 0.88;
  text-decoration: none;
}

.btn-copy-main:active {
  transform: scale(0.96);
}

.count-readout {
  display: flex;
  align-items: baseline;
  gap: 0.3rem;
  font-family: var(--font-mono);
}

.primary-count-num {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.count-divider-slash {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.count-remaining-text {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent-green);
  margin-left: 0.25rem;
}

.status-safe { color: var(--accent-green); }
.status-warning { color: var(--accent-gold); }
.status-overflow { color: var(--accent-red); }

.footer-actions-group {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  margin-left: auto;
}

.btn-copy-action {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.4rem 0.85rem;
  font-size: 0.82rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  background: var(--bg-hover);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-copy-action:hover {
  background: var(--border-color);
}

.btn-copy-action:active {
  transform: scale(0.96);
}

.btn-post-x {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.4rem 0.95rem;
  font-size: 0.82rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  background: #1d9bf0;
  color: #ffffff !important;
  border: none;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: transform 0.12s var(--ease-spring), opacity var(--transition-fast);
}

.btn-post-x:hover {
  opacity: 0.9;
  text-decoration: none;
}

.btn-post-x:active {
  transform: scale(0.96);
}

/* Inline Metrics Row Below Composer */
.inline-metrics-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 0.85rem;
  font-size: 0.78rem;
  color: var(--text-secondary);
  flex-wrap: wrap;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  margin-top: 0.75rem;
  box-shadow: var(--shadow-sm);
}

.inline-metric {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-sm);
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
}

.metric-key {
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.74rem;
}

.metric-val {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
  font-size: 0.78rem;
}

.metric-urls .metric-val {
  color: #0284c7;
}

.metric-dot {
  display: none !important;
}

/* Subpage Real-Time Metrics Grid */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 0.5rem;
  padding: 0.85rem 1.15rem;
  border-top: 1px solid var(--border-color);
  background: var(--bg-card);
}

@media (max-width: 768px) {
  .metrics-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 0.65rem;
  }
}

@media (max-width: 480px) {
  .metrics-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.metric-box {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.metric-label {
  font-size: 0.68rem;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.metric-value {
  font-family: var(--font-mono);
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
}

.counter-footer {
  padding: 0.55rem 1.15rem;
  border-top: 1px solid var(--border-color);
  background: var(--bg-card);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-note {
  font-size: 0.74rem;
  color: var(--text-muted);
}

/* ==========================================================================
   RIGHT COLUMN: LIVE POST PREVIEW MOCKUP
   ========================================================================== */
.preview-card {
  display: flex;
  flex-direction: column;
}

.preview-card-header {
  padding: 0.65rem 1rem;
}

.preview-header-controls {
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.btn-tool-sm {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.25rem 0.55rem;
  font-size: 0.76rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  background: var(--bg-hover);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  cursor: pointer;
}

.btn-tool-sm:hover {
  color: var(--text-primary);
}

.device-switcher {
  display: flex;
  align-items: center;
  background: var(--bg-hover);
  border-radius: var(--radius-sm);
  padding: 2px;
  border: 1px solid var(--border-color);
}

.device-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: 4px;
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.device-btn.active {
  background: var(--bg-card);
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
}

.verified-toggle-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.25rem 0.55rem;
  border-radius: var(--radius-full);
  font-size: 0.74rem;
  font-weight: 600;
  background: var(--bg-hover);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.verified-toggle-btn.active {
  background: rgba(29, 155, 240, 0.12);
  color: #1d9bf0;
  border-color: rgba(29, 155, 240, 0.35);
}

/* 𝕏 Tweet Feed Mockup */
.preview-feed-wrap {
  padding: 1.15rem;
  background: var(--bg-card);
  min-height: 200px;
  transition: all 0.25s ease;
}

.preview-feed-wrap.mobile-view {
  display: flex;
  justify-content: center;
}

.preview-feed-wrap.mobile-view .tweet-mockup-body {
  max-width: 340px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.85rem;
}

.tweet-mockup-body {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.mockup-author-row {
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
}

.mockup-avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: linear-gradient(135deg, #3b82f6, #1d4ed8);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.95rem;
  flex-shrink: 0;
}

.mockup-author-meta {
  display: flex;
  flex-direction: column;
}

.author-name-line {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex-wrap: wrap;
  font-size: 0.88rem;
  line-height: 1.25;
}

.author-display-name {
  font-weight: 700;
  color: var(--text-primary);
}

.author-verified-icon {
  display: inline-flex;
  align-items: center;
}

.author-handle, .post-time, .author-sep {
  color: var(--text-muted);
  font-size: 0.82rem;
}

.mockup-post-content {
  font-size: 0.96rem;
  line-height: 1.55;
  color: var(--text-primary);
  word-break: break-word;
  white-space: pre-wrap;
}

.preview-link, .preview-hashtag, .preview-mention {
  color: #1d9bf0;
  text-decoration: none;
  font-weight: 500;
}

.preview-link:hover, .preview-hashtag:hover, .preview-mention:hover {
  text-decoration: underline;
}

/* Tweet Engagement Bar Mockup */
.mockup-engagement-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.85rem;
  border-top: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 0.76rem;
}

.engagement-item {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  cursor: default;
}

.engagement-actions-right {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.icon-action-btn {
  color: var(--text-muted);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 2px;
}

/* Preview Card Bottom CTAs */
.preview-card-bottom-cta {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.75rem 1rem;
  border-top: 1px solid var(--border-color);
  background: var(--bg-card);
}

.btn-copy-preview-wide {
  flex: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.55rem 1rem;
  border-radius: var(--radius-sm);
  background: var(--bg-hover);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-size: 0.84rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-copy-preview-wide:hover {
  background: var(--border-color);
}

.btn-post-x-wide {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.55rem 1.15rem;
  border-radius: var(--radius-sm);
  background: #1d9bf0;
  color: #ffffff !important;
  font-size: 0.84rem;
  font-weight: 700;
  cursor: pointer;
  border: none;
  box-shadow: var(--shadow-sm);
  transition: transform 0.12s var(--ease-spring), opacity var(--transition-fast);
}

.btn-post-x-wide:hover {
  opacity: 0.9;
  text-decoration: none;
}

.btn-tool-sm:active {
  transform: scale(0.95);
}

.thread-cards-grid {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.thread-empty-box {
  padding: 1.5rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.88rem;
  background: var(--bg-card);
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-md);
}

.thread-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.85rem 1rem;
  transition: border-color var(--transition-fast), transform var(--transition-fast);
}

.thread-card:hover {
  border-color: var(--accent-x);
  transform: translateY(-1px);
}

.thread-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.55rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border-color);
}

.thread-card-num {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 700;
  color: var(--text-primary);
}

.thread-card-count {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-muted);
}

.thread-card-count.over-limit {
  color: var(--accent-red);
  font-weight: 700;
}

.btn-copy-chunk {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.74rem;
  font-weight: 600;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-pill);
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-copy-chunk:hover {
  background: var(--accent-x);
  border-color: var(--accent-x);
  color: #ffffff;
}

.btn-copy-chunk:active {
  transform: scale(0.94);
}

.thread-card-body {
  font-size: 0.92rem;
  line-height: 1.55;
  color: var(--text-primary);
  white-space: pre-wrap;
  word-break: break-word;
}

.btn-tool.active {
  background: var(--accent-x-subtle);
  border-color: var(--accent-x);
  color: var(--accent-x);
}

/* ==========================================================================
   SEO CONTENT ARTICLE & SECTIONS
   ========================================================================== */
.seo-content-article {
  display: flex;
  flex-direction: column;
  gap: 3.5rem;
  margin-bottom: 5rem;
}

.content-block h2 {
  font-size: clamp(1.6rem, 3vw, 2.1rem);
  font-weight: 800;
  margin-bottom: 1rem;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.content-block p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  line-height: 1.75;
  margin-bottom: 1.1rem;
}

.content-block strong {
  color: var(--text-primary);
}

/* Step Cards */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  transition: border-color var(--transition-fast);
}

.step-card:hover {
  border-color: var(--accent-x);
}

.step-number {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--accent-x-subtle);
  color: var(--accent-x);
  border: 1px solid rgba(29, 155, 240, 0.3);
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.95rem;
}

.step-content h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.35rem;
}

.step-content p {
  font-size: 0.9rem;
  line-height: 1.5;
  margin-bottom: 0;
}

/* ==========================================================================
   TABLES & DATA MATRICES (Universal Clean Vercel Style)
   ========================================================================== */
table,
.specs-table,
.article-data-table,
.comparison-table,
.data-table,
.proximity-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
}

.table-wrapper,
.specs-table-wrapper,
.proximity-table-wrap,
.proximity-table-responsive,
.article-data-table-wrapper,
.article-table-container {
  margin: 1.5rem 0 2rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow-x: auto;
  background: var(--bg-card);
  box-shadow: var(--shadow-sm);
}

.proximity-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 1.15rem;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-subtle);
}

.proximity-title {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

.proximity-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text-muted);
  background: var(--bg-hover);
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
}

table thead th,
.specs-table th,
.article-data-table th,
.comparison-table th,
.data-table th,
.proximity-table th {
  background: var(--bg-subtle);
  padding: 0.85rem 1.15rem;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border-color);
  white-space: nowrap;
}

table tbody td,
.specs-table td,
.article-data-table td,
.comparison-table td,
.data-table td,
.proximity-table td {
  padding: 0.95rem 1.15rem;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-secondary);
  vertical-align: middle;
  line-height: 1.5;
}

table tbody tr:last-child td,
.specs-table tbody tr:last-child td,
.article-data-table tbody tr:last-child td,
.comparison-table tbody tr:last-child td,
.data-table tbody tr:last-child td,
.proximity-table tbody tr:last-child td {
  border-bottom: none;
}

table tbody tr:hover,
.specs-table tbody tr:hover,
.article-data-table tbody tr:hover,
.comparison-table tbody tr:hover,
.data-table tbody tr:hover,
.proximity-table tbody tr:hover {
  background: var(--bg-hover);
}

table td strong,
.specs-table td strong,
.article-data-table td strong {
  color: var(--text-primary);
  font-weight: 600;
}

table code,
.specs-table code,
.article-data-table code,
.data-table code {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  background: var(--bg-subtle);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
}

/* Weight Badge Pills */
.weight-badge,
.unit-badge {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 700;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  white-space: nowrap;
}

.weight-badge.weight-1,
.unit-badge.badge-blue {
  background: rgba(29, 155, 240, 0.1);
  color: #1d9bf0;
  border: 1px solid rgba(29, 155, 240, 0.25);
}

.weight-badge.weight-2,
.unit-badge.badge-green {
  background: rgba(16, 185, 129, 0.1);
  color: #10b981;
  border: 1px solid rgba(16, 185, 129, 0.25);
}

.unit-badge.badge-purple {
  background: rgba(139, 92, 246, 0.1);
  color: #8b5cf6;
  border: 1px solid rgba(139, 92, 246, 0.25);
}

.weight-badge.weight-url {
  background: rgba(245, 158, 11, 0.1);
  color: #f59e0b;
  border: 1px solid rgba(245, 158, 11, 0.25);
}

/* Strategy Grid */
.strategies-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
  margin: 1.75rem 0 2rem;
}

.strategy-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.35rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  transition: border-color var(--transition-fast);
}

.strategy-card:hover {
  border-color: var(--border-color-strong);
}

.strategy-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-x);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.strategy-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

.strategy-card p {
  font-size: 0.9rem;
  line-height: 1.55;
  color: var(--text-secondary);
  margin: 0;
}

.strategy-card code {
  font-family: var(--font-mono);
  background: var(--bg-subtle);
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
  font-size: 0.85rem;
  color: var(--accent-x);
}

/* Clean Terminal / Code-Diff Style Comparison */
.diff-container {
  margin: 2rem 0;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.diff-header {
  padding: 0.85rem 1.25rem;
  background: var(--bg-subtle);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.diff-header h3 {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

.diff-label-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-pill);
  background: var(--bg-input);
  color: var(--text-muted);
  border: 1px solid var(--border-color);
}

.diff-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
}

@media (max-width: 720px) {
  .diff-grid {
    grid-template-columns: 1fr;
  }
}

.diff-pane {
  padding: 1.35rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.diff-pane-before {
  border-right: 1px solid var(--border-color);
  background: rgba(244, 33, 46, 0.02);
}

@media (max-width: 720px) {
  .diff-pane-before {
    border-right: none;
    border-bottom: 1px solid var(--border-color);
  }
}

.diff-pane-after {
  background: rgba(0, 186, 124, 0.02);
}

.diff-pane-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.diff-pane-title {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.diff-status-pill {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 700;
  padding: 0.15rem 0.55rem;
  border-radius: var(--radius-pill);
}

.diff-status-pill.danger {
  background: var(--accent-red-subtle);
  color: var(--accent-red);
  border: 1px solid rgba(244, 33, 46, 0.25);
}

.diff-status-pill.success {
  background: var(--accent-green-subtle);
  color: var(--accent-green);
  border: 1px solid rgba(0, 186, 124, 0.25);
}

.diff-content {
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--text-primary);
  margin: 0;
}

.diff-strike {
  background: rgba(244, 33, 46, 0.12);
  color: var(--accent-red);
  text-decoration: line-through;
  padding: 0 0.2rem;
  border-radius: 2px;
}

.diff-bullet {
  display: block;
  margin: 0.35rem 0;
  color: var(--text-primary);
}

/* Modern FAQ Accordion */
.faq-accordion {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  margin-top: 1.5rem;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.faq-item:hover {
  border-color: var(--border-color-strong);
}

.faq-btn {
  width: 100%;
  text-align: left;
  padding: 1.15rem 1.35rem;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.faq-chevron {
  transition: transform var(--transition-smooth);
  flex-shrink: 0;
  fill: var(--text-secondary);
}

.faq-btn[aria-expanded="true"] .faq-chevron {
  transform: rotate(180deg);
  fill: var(--accent-x);
}

.faq-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.faq-inner {
  padding: 0 1.35rem 1.25rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

.faq-inner ul {
  margin: 0.65rem 0 0 1.25rem;
}

.faq-inner li {
  margin-bottom: 0.35rem;
}

/* Toast */
.toast-container {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  pointer-events: none;
}

.toast {
  background: var(--bg-card);
  border: 1px solid var(--accent-x);
  color: var(--text-primary);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  box-shadow: var(--glow-card);
  backdrop-filter: var(--glass-blur);
  font-size: 0.875rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  pointer-events: auto;
  animation: toastIn 0.25s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes toastIn {
  from { opacity: 0; transform: translateY(20px) scale(0.9); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.toast.hide {
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.25s ease;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ==========================================================================
   Language Selector Dropdown
   ========================================================================== */
.lang-selector {
  position: relative;
  display: inline-block;
}

.lang-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-full);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  transition: all var(--transition-fast);
}

.lang-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-hover);
  background: var(--bg-hover);
}

.lang-dropdown {
  position: absolute;
  top: calc(100% + 0.4rem);
  right: 0;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
  backdrop-filter: var(--glass-blur);
  padding: 0.4rem 0;
  min-width: 150px;
  z-index: 100;
  display: none;
  flex-direction: column;
}

.lang-dropdown.show {
  display: flex;
  animation: fadeInDown 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

.lang-option {
  padding: 0.5rem 1rem;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.lang-option:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.lang-option.active {
  color: var(--accent-x);
  font-weight: 700;
  background: rgba(29, 155, 240, 0.08);
}

/* ==========================================================================
   Subpages Layout & Prose Typography (About, Guidelines, Legal, Sitemap)
   ========================================================================== */
.subpage-container {
  max-width: 900px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 5rem;
}

.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
  font-family: var(--font-mono);
}

.breadcrumbs a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.breadcrumbs a:hover {
  color: var(--accent-x);
}

.page-hero {
  margin-bottom: 2.5rem;
}

.page-hero h1 {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 0.75rem;
  line-height: 1.15;
}

.page-hero p.lead {
  font-size: 1.15rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.prose-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
  line-height: 1.8;
  color: var(--text-secondary);
  font-size: 1rem;
}

.prose-card h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-top: 2rem;
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.5rem;
}

.prose-card h2:first-of-type {
  margin-top: 0;
}

.prose-card h3 {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
}

.prose-card p {
  margin-bottom: 1.25rem;
}

.prose-card ul, .prose-card ol {
  margin-bottom: 1.25rem;
  padding-left: 1.5rem;
}

.prose-card li {
  margin-bottom: 0.5rem;
}

.prose-card a {
  color: var(--accent-x);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.prose-card a:hover {
  color: #fff;
}

.prose-card strong {
  color: var(--text-primary);
}

.prose-card blockquote {
  border-left: 3px solid var(--accent-x);
  margin: 1.5rem 0;
  padding: 0.75rem 1.25rem;
  background: var(--bg-input);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-style: italic;
}

/* Contact Form */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  margin-bottom: 1.25rem;
}

@media (max-width: 640px) {
  .contact-grid {
    grid-template-columns: 1fr;
  }
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-bottom: 1.25rem;
}

.form-group label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-primary);
}

.form-input, .form-textarea {
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-family: var(--font-main);
  font-size: 0.95rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color var(--transition-fast);
}

.form-input:focus, .form-textarea:focus {
  border-color: var(--accent-x);
  box-shadow: 0 0 0 2px rgba(29, 155, 240, 0.2);
}

.form-textarea {
  min-height: 140px;
  resize: vertical;
}

.btn-submit {
  background: var(--text-primary);
  color: var(--bg-body);
  border: none;
  font-family: var(--font-main);
  font-size: 0.95rem;
  font-weight: 700;
  padding: 0.8rem 1.75rem;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-submit:hover {
  background: var(--accent-x);
  color: #fff;
  transform: translateY(-1px);
}

/* Sitemap Grid */
.sitemap-columns {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 2rem;
  margin-top: 1.5rem;
}

.sitemap-category h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border-color);
}

.sitemap-category ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.sitemap-category a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: color var(--transition-fast);
}

.sitemap-category a:hover {
  color: var(--accent-x);
}

/* ==========================================================================
   Header CTA & In-Content CTA Banners
   ========================================================================== */
.btn-header-cta {
  background: rgba(29, 155, 240, 0.12);
  border: 1px solid rgba(29, 155, 240, 0.35);
  color: var(--text-primary);
  font-family: var(--font-main);
  font-size: 0.82rem;
  font-weight: 700;
  padding: 0.45rem 0.95rem;
  border-radius: var(--radius-full);
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.btn-header-cta:hover {
  background: var(--accent-x);
  border-color: var(--accent-x);
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(29, 155, 240, 0.35);
  transform: translateY(-1px);
}

@media (max-width: 640px) {
  .btn-header-cta span {
    display: none;
  }
  .btn-header-cta {
    padding: 0.45rem;
  }
}

/* In-Content CTA Banner */
.content-cta-banner {
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.75rem 2rem;
  margin: 2.5rem 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.25rem;
  box-shadow: var(--shadow-sm);
}

.content-cta-info h3 {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
}

.content-cta-info p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin: 0;
  line-height: 1.4;
}

.btn-cta-action {
  background: var(--accent-x);
  color: #ffffff;
  font-family: var(--font-main);
  font-size: 0.9rem;
  font-weight: 700;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-full);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  white-space: nowrap;
  transition: all var(--transition-fast);
}

.btn-cta-action:hover {
  background: #1a8cd8;
  color: #ffffff;
  transform: translateY(-2px);
}

/* Bottom of Every Page Global CTA Banner */
.bottom-global-cta {
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 3.5rem 2rem;
  text-align: center;
  margin: 4rem auto 2rem;
  max-width: 900px;
  box-shadow: var(--shadow-sm);
}

.bottom-global-cta h2 {
  font-size: clamp(1.6rem, 3.5vw, 2.25rem);
  font-weight: 800;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.bottom-global-cta p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 620px;
  margin: 0 auto 1.75rem;
  line-height: 1.55;
}

.bottom-global-cta .btn-cta-large {
  background: #0f1419;
  color: #ffffff;
  font-family: var(--font-main);
  font-size: 1.05rem;
  font-weight: 800;
  padding: 0.9rem 2.25rem;
  border-radius: var(--radius-full);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  transition: all var(--transition-fast);
}

[data-theme="dark"] .bottom-global-cta .btn-cta-large {
  background: #ffffff;
  color: #000000;
}

.bottom-global-cta .btn-cta-large:hover {
  background: var(--accent-x);
  color: #ffffff;
  transform: translateY(-2px);
}

/* ==========================================================================
   SITE FOOTER (Ultra-Modern Multi-Column SaaS Design)
   ========================================================================== */
.site-footer {
  position: relative;
  background: var(--bg-subtle);
  border-top: 1px solid var(--border-color);
  padding: 4.5rem 0 2.5rem;
  margin-top: auto;
  color: var(--text-secondary);
  overflow: hidden;
  transition: background-color var(--transition-smooth), border-color var(--transition-smooth);
}

[data-theme="dim"] .site-footer {
  background: var(--bg-subtle);
}

[data-theme="light"] .site-footer {
  background: var(--bg-subtle);
  border-top-color: var(--border-color);
}

.footer-ambient-glow {
  display: none;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  margin-bottom: 3.5rem;
}

@media (min-width: 640px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
  }
}

@media (min-width: 992px) {
  .footer-grid {
    grid-template-columns: 1.6fr 1fr 1fr 1fr;
    gap: 3rem;
  }
}

.footer-col-brand {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

@media (min-width: 640px) and (max-width: 991px) {
  .footer-col-brand {
    grid-column: span 2;
  }
}

.footer-logo {
  font-size: 1.15rem;
}

.footer-desc {
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--text-secondary);
  max-width: 360px;
}

.footer-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.25rem;
}

.trust-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.76rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-full);
}

.trust-badge svg {
  color: var(--accent-x);
}

.badge-dot-live {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: #00ba7c;
  box-shadow: 0 0 6px #00ba7c;
}

.footer-col-title {
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--text-primary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 1.15rem;
}

.footer-nav-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.footer-nav-list li a {
  font-size: 0.88rem;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast), transform var(--transition-fast);
  display: inline-block;
}

.footer-nav-list li a:hover {
  color: var(--accent-x);
  transform: translateX(2px);
  text-decoration: none;
}

.footer-lang-grid {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.footer-lang-link {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
  text-decoration: none;
  padding: 0.2rem 0;
  transition: color var(--transition-fast);
}

.footer-lang-link:hover {
  color: var(--accent-x);
  text-decoration: none;
}

.footer-lang-link.active {
  color: var(--accent-x);
  font-weight: 700;
}

.f-flag {
  font-size: 0.95rem;
}

.footer-bottom-bar {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
  align-items: center;
  justify-content: space-between;
}

@media (min-width: 768px) {
  .footer-bottom-bar {
    flex-direction: row;
  }
}

.footer-legal-copy {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  text-align: center;
}

@media (min-width: 768px) {
  .footer-legal-copy {
    text-align: left;
  }
}

.footer-disclaimer {
  font-size: 0.74rem;
  color: var(--text-muted);
  opacity: 0.85;
}

.back-to-top {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.45rem 0.95rem;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.back-to-top:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--border-focus);
  transform: translateY(-2px);
  text-decoration: none;
}

/* ==========================================================================
   MOBILE VIEW POLISH (< 600px)
   ========================================================================== */
@media (max-width: 599px) {
  .header-inner {
    height: 56px;
  }

  .brand-name {
    font-size: 1rem;
  }

  .btn-header-cta {
    padding: 0.4rem 0.7rem;
    font-size: 0.76rem;
  }

  .lang-btn {
    padding: 0.35rem 0.5rem;
  }

  .lang-cur-code {
    display: none;
  }

  .site-footer {
    padding: 3.5rem 0 2rem;
  }

  .footer-bottom-bar {
    text-align: center;
    gap: 1.5rem;
  }
}

/* ==========================================================================
   Deferred Semantic Element Paint (Sub-150ms FCP Optimization)
   ========================================================================== */
.deferred-paint {
  content-visibility: auto;
  contain-intrinsic-size: 1px 600px;
}

/* ==========================================================================
   Zero-JS NoScript Fallback Framework
   ========================================================================== */
.noscript-banner {
  margin-bottom: 24px;
  padding: 18px 24px;
  background: rgba(255, 122, 23, 0.08);
  border: 1px solid rgba(255, 122, 23, 0.3);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  line-height: 1.6;
}

.noscript-banner h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--accent-sunset);
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.noscript-banner p {
  font-size: 14px;
  color: var(--text-secondary);
  margin: 0;
}

/* ==========================================================================
   Breadcrumbs Component
   ========================================================================== */
.breadcrumbs-nav {
  margin-bottom: 24px;
  padding: 8px 0;
}

.breadcrumbs-list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 13px;
  color: var(--text-muted);
}

.breadcrumbs-list li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.breadcrumbs-list a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.breadcrumbs-list a:hover {
  color: var(--accent-x);
}

.breadcrumbs-separator {
  color: var(--text-muted);
  opacity: 0.6;
}

.breadcrumbs-current {
  color: var(--text-primary);
  font-weight: 600;
}

/* ==========================================================================
   Blog Listing Styles
   ========================================================================== */
.blog-hero {
  text-align: center;
  padding: 32px 0 40px;
  max-width: 760px;
  margin: 0 auto;
}

.blog-hero-title {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.blog-hero-subtitle {
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-secondary);
}

.blog-filter-bar {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 40px;
}

.blog-filter-pill {
  padding: 8px 18px;
  font-size: 13px;
  font-weight: 600;
  border-radius: var(--radius-pill);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.blog-filter-pill:hover,
.blog-filter-pill.active {
  background: var(--text-primary);
  color: var(--text-inverted);
  border-color: var(--text-primary);
}

.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 28px;
  margin-bottom: 60px;
}

.blog-card {
  display: flex;
  flex-direction: column;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  text-decoration: none;
  transition: transform var(--transition-smooth), box-shadow var(--transition-smooth), border-color var(--transition-smooth);
}

.blog-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-x);
  box-shadow: var(--shadow-lg);
}

.blog-card-header {
  padding: 24px 24px 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.blog-card-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-radius: var(--radius-pill);
  background: var(--accent-x-subtle);
  color: var(--accent-x);
  border: 1px solid rgba(29, 155, 240, 0.25);
}

.blog-card-badge.badge-green {
  background: var(--accent-green-subtle);
  color: var(--accent-green);
  border-color: rgba(0, 186, 124, 0.25);
}

.blog-card-readtime {
  font-size: 12px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 4px;
}

.blog-card-body {
  padding: 0 24px 20px;
  flex: 1;
}

.blog-card-title {
  font-size: 19px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.35;
  margin-bottom: 10px;
  transition: color var(--transition-fast);
}

.blog-card:hover .blog-card-title {
  color: var(--accent-x);
}

.blog-card-excerpt {
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-secondary);
  margin: 0;
}

.blog-card-footer {
  padding: 16px 24px 20px;
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-muted);
}

.blog-card-author {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  color: var(--text-primary);
}

.blog-author-avatar {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--accent-x-subtle);
  color: var(--accent-x);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  font-weight: 800;
}

.blog-card-arrow {
  color: var(--accent-x);
  display: flex;
  align-items: center;
  gap: 4px;
  font-weight: 600;
  transition: transform var(--transition-fast);
}

.blog-card:hover .blog-card-arrow {
  transform: translateX(4px);
}

/* ==========================================================================
   Single Blog Post & Article Layout
   ========================================================================== */
.article-wrapper {
  max-width: 820px;
  margin: 0 auto;
  padding: 20px 0 60px;
}

.article-header {
  margin-bottom: 36px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-color);
}

.article-category-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.article-main-title {
  font-size: clamp(2rem, 4.5vw, 2.85rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: 20px;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 18px;
  font-size: 13px;
  color: var(--text-secondary);
}

.article-meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.article-review-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  background: var(--accent-green-subtle);
  color: var(--accent-green);
  font-weight: 600;
  font-size: 12px;
  border: 1px solid rgba(0, 186, 124, 0.25);
}

.article-body {
  font-size: 16px;
  line-height: 1.75;
  color: var(--text-secondary);
}

.article-body h2 {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  margin: 44px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

.article-body h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 28px 0 12px;
}

.article-body p {
  margin-bottom: 20px;
}

.article-body strong {
  color: var(--text-primary);
}

.article-body ul,
.article-body ol {
  margin: 0 0 24px 24px;
  padding: 0;
}

.article-body li {
  margin-bottom: 8px;
}

.article-body code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  padding: 2px 6px;
  background: var(--bg-input);
  border-radius: 4px;
  color: var(--accent-x);
  border: 1px solid var(--border-color);
}

.article-callout {
  padding: 20px 24px;
  margin: 28px 0;
  background: var(--bg-secondary);
  border-left: 4px solid var(--accent-x);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  color: var(--text-primary);
}

.article-callout h4 {
  font-size: 15px;
  font-weight: 700;
  color: var(--accent-x);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.article-callout p {
  margin: 0;
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.article-author-card {
  margin-top: 48px;
  padding: 28px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

.author-card-avatar {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--accent-x-subtle);
  color: var(--accent-x);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 800;
  flex-shrink: 0;
}

.author-card-info h4 {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.author-card-info p {
  font-size: 13px;
  line-height: 1.55;
  color: var(--text-secondary);
  margin: 0;
}

/* Direct Answer (BLUF) Box */
.direct-answer-box {
  margin: 18px 0 24px;
  padding: 16px 20px;
  background: var(--bg-card);
  border-left: 4px solid var(--accent-x);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  border-top: 1px solid var(--border-color);
  border-right: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  font-size: 15.5px;
  line-height: 1.6;
  color: var(--text-primary);
}

.direct-answer-box strong {
  color: var(--accent-x);
  font-weight: 700;
}

/* Stats Callout Grid */
.stats-callout-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  margin: 28px 0;
}

.stat-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px 16px;
  text-align: center;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.stat-box:hover {
  transform: translateY(-2px);
  border-color: var(--accent-x);
}

.stat-big-num {
  font-size: clamp(1.9rem, 3.2vw, 2.5rem);
  font-weight: 800;
  color: var(--accent-x);
  line-height: 1.1;
  margin-bottom: 6px;
  letter-spacing: -0.02em;
}

.stat-desc {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.stat-sub {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.4;
}

/* Expert Quotation Card */
.expert-quote-card {
  margin: 32px 0;
  padding: 24px 28px;
  background: var(--bg-card);
  border-left: 4px solid var(--accent-x);
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
  border-top: 1px solid var(--border-color);
  border-right: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  position: relative;
}

.quote-text {
  font-size: 15px;
  font-style: italic;
  line-height: 1.65;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.quote-author-row {
  display: flex;
  align-items: center;
  gap: 14px;
}

.quote-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--accent-x-subtle);
  color: var(--accent-x);
  font-weight: 800;
  font-size: 15px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  border: 1px solid rgba(29, 155, 240, 0.25);
}

.quote-author-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.quote-author-name {
  font-weight: 700;
  font-size: 14px;
  color: var(--text-primary);
}

.quote-author-role {
  font-size: 12px;
  color: var(--text-muted);
}

/* Article Data & Comparison Tables */
.article-table-container {
  margin: 28px 0;
  overflow-x: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  box-shadow: var(--shadow-sm);
  -webkit-overflow-scrolling: touch;
}

.article-data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
  text-align: left;
  min-width: 580px;
}

.article-data-table th {
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-weight: 700;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-color);
  white-space: nowrap;
}

.article-data-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-secondary);
  line-height: 1.5;
  vertical-align: middle;
}

.article-data-table tbody tr:last-child td {
  border-bottom: none;
}

.article-data-table tbody tr:hover td {
  background: var(--bg-hover);
}

.table-tag {
  display: inline-block;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.table-tag-primary {
  background: var(--accent-x-subtle);
  color: var(--accent-x);
}

.table-tag-green {
  background: var(--accent-green-subtle);
  color: var(--accent-green);
}

.table-tag-warn {
  background: rgba(255, 122, 0, 0.12);
  color: var(--accent-orange);
}

/* Citations & References Box */
.citations-box {
  margin: 44px 0 28px;
  padding: 26px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
}

.citations-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.citations-list {
  list-style: decimal;
  margin: 0 0 0 20px;
  padding: 0;
  font-size: 13.5px;
  color: var(--text-secondary);
  line-height: 1.7;
}

.citations-list li {
  margin-bottom: 10px;
}

.citation-source {
  font-weight: 700;
  color: var(--text-primary);
}

.citation-link {
  color: var(--accent-x);
  text-decoration: underline;
  word-break: break-all;
}