/* ==========================================================================
   Loadin Official Website — Spatial Glassmorphism & High-Performance Design
   Theme Support: Black (Dark Graphite) & White (Clean Daylight)
   ========================================================================== */

:root,
[data-theme="black"] {
  --font-sans: "Pretendard Variable", "Pretendard", -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", "Cascadia Mono", Consolas, monospace;

  --bg-body: #0C0C0E;
  --bg-surface: #141417;
  --bg-surface-elevated: #1B1B1F;
  --bg-surface-glass: rgba(20, 20, 24, 0.72);
  --bg-surface-glass-border: rgba(255, 255, 255, 0.08);

  --border-subtle: rgba(255, 255, 255, 0.07);
  --border-medium: rgba(255, 255, 255, 0.12);
  --border-strong: rgba(255, 255, 255, 0.22);

  --text-primary: #F5F5F7;
  --text-secondary: #A1A1A8;
  --text-muted: #6E6E75;

  --accent-blue: #0A84FF;
  --accent-blue-hover: #2997FF;
  --accent-blue-glow: rgba(10, 132, 255, 0.28);
  --accent-cyan: #5AC8FA;
  --accent-green: #30D158;
  --accent-orange: #FF9F0A;
  --accent-purple: #BF5AF2;

  --code-bg: #111114;
  --code-border: rgba(255, 255, 255, 0.08);

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 8px 28px rgba(0, 0, 0, 0.55);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.75);

  --mesh-glow-1: rgba(10, 132, 255, 0.14);
  --mesh-glow-2: rgba(90, 200, 250, 0.08);

  --card-gradient: linear-gradient(180deg, rgba(255, 255, 255, 0.035) 0%, rgba(255, 255, 255, 0.01) 100%);
  --badge-bg: rgba(10, 132, 255, 0.12);
  --badge-text: #5AC8FA;
  --badge-border: rgba(10, 132, 255, 0.3);
}

[data-theme="white"] {
  --bg-body: #FBFBFD;
  --bg-surface: #FFFFFF;
  --bg-surface-elevated: #F2F2F7;
  --bg-surface-glass: rgba(255, 255, 255, 0.82);
  --bg-surface-glass-border: rgba(0, 0, 0, 0.08);

  --border-subtle: rgba(0, 0, 0, 0.06);
  --border-medium: rgba(0, 0, 0, 0.12);
  --border-strong: rgba(0, 0, 0, 0.22);

  --text-primary: #1D1D1F;
  --text-secondary: #515154;
  --text-muted: #86868B;

  --accent-blue: #0071E3;
  --accent-blue-hover: #0077ED;
  --accent-blue-glow: rgba(0, 113, 227, 0.18);
  --accent-cyan: #0288D1;
  --accent-green: #28CD41;
  --accent-orange: #FF9500;
  --accent-purple: #AF52DE;

  --code-bg: #F4F4F8;
  --code-border: rgba(0, 0, 0, 0.08);

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.12);

  --mesh-glow-1: rgba(0, 113, 227, 0.08);
  --mesh-glow-2: rgba(90, 200, 250, 0.06);

  --card-gradient: linear-gradient(180deg, rgba(255, 255, 255, 0.9) 0%, rgba(246, 246, 249, 0.8) 100%);
  --badge-bg: rgba(0, 113, 227, 0.08);
  --badge-text: #0071E3;
  --badge-border: rgba(0, 113, 227, 0.22);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-body);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background-color 0.25s cubic-bezier(0.16, 1, 0.3, 1), color 0.25s ease;
  position: relative;
}

/* Unified Minimalist Pill Scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: rgba(140, 140, 150, 0.3);
  border-radius: 999px;
  border: 2px solid transparent;
  background-clip: padding-box;
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(140, 140, 150, 0.5);
}

a {
  color: inherit;
  text-decoration: none;
}

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

/* ==========================================================================
   Background Ambient Mesh
   ========================================================================== */
.ambient-mesh {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.mesh-glow-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.8;
  transform: translateZ(0);
}

.orb-primary {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--mesh-glow-1) 0%, transparent 70%);
  top: -120px;
  left: 50%;
  transform: translateX(-50%);
}

.orb-secondary {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, var(--mesh-glow-2) 0%, transparent 70%);
  top: 40%;
  right: -100px;
}

.orb-tertiary {
  width: 550px;
  height: 550px;
  background: radial-gradient(circle, var(--mesh-glow-1) 0%, transparent 70%);
  bottom: 10%;
  left: -150px;
}

/* ==========================================================================
   Layout Containers
   ========================================================================== */
.container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

section {
  padding: 96px 0;
  position: relative;
  z-index: 1;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  background: var(--bg-surface-glass);
  border-bottom: 1px solid var(--border-subtle);
  transition: all 0.25s ease;
}

.site-header.scrolled {
  background: var(--bg-surface-glass);
  box-shadow: var(--shadow-sm);
  border-bottom-color: var(--border-medium);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

.brand-logo-img {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  display: block;
}

.brand-version-badge {
  font-size: 0.72rem;
  font-family: var(--font-mono);
  font-weight: 600;
  padding: 2px 7px;
  border-radius: 6px;
  background: var(--badge-bg);
  color: var(--badge-text);
  border: 1px solid var(--badge-border);
  transition: all 0.2s;
}

.brand-version-badge:hover {
  background: var(--accent-blue);
  color: #FFFFFF;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  font-size: 0.94rem;
  color: var(--text-secondary);
  font-weight: 500;
  transition: color 0.2s ease;
  position: relative;
  padding: 6px 0;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.icon-btn {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  transition: all 0.2s ease;
}

.icon-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-medium);
  transform: translateY(-1px);
}

.lang-btn {
  font-size: 0.82rem;
  font-weight: 600;
  padding: 0 10px;
  width: auto;
  min-width: 42px;
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent-blue);
  color: #FFFFFF !important;
  font-size: 0.88rem;
  font-weight: 600;
  padding: 8px 18px;
  border-radius: 10px;
  transition: all 0.2s ease;
  box-shadow: 0 4px 14px var(--accent-blue-glow);
}

.nav-cta:hover {
  background: var(--accent-blue-hover);
  transform: translateY(-1px);
}

.mobile-menu-btn {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
}

/* ==========================================================================
   Buttons & UI Elements
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-weight: 600;
  padding: 12px 24px;
  border-radius: 12px;
  font-size: 0.96rem;
  transition: all 0.22s cubic-bezier(0.16, 1, 0.3, 1);
  text-decoration: none;
  cursor: pointer;
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent-blue);
  color: #FFFFFF;
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: 0 6px 20px var(--accent-blue-glow);
}

.btn-primary:hover {
  background: var(--accent-blue-hover);
  transform: translateY(-2px);
  box-shadow: 0 10px 28px var(--accent-blue-glow);
}

.btn-secondary {
  background: var(--bg-surface-elevated);
  color: var(--text-primary);
  border: 1px solid var(--border-medium);
}

.btn-secondary:hover {
  border-color: var(--border-strong);
  background: var(--bg-surface);
  transform: translateY(-2px);
}

.btn-outline {
  border: 1px solid var(--border-medium);
  color: var(--text-secondary);
}

.btn-outline:hover {
  border-color: var(--accent-blue);
  color: var(--accent-blue);
}

.btn-lg {
  padding: 15px 30px;
  font-size: 1.05rem;
  border-radius: 14px;
}

.btn-sm {
  padding: 8px 14px;
  font-size: 0.84rem;
  border-radius: 8px;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 4px 12px;
  border-radius: 999px;
  background: var(--badge-bg);
  color: var(--badge-text);
  border: 1px solid var(--badge-border);
  margin-bottom: 16px;
}

.section-head {
  text-align: center;
  max-width: 780px;
  margin: 0 auto 56px;
}

.section-title {
  font-size: 2.6rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.22;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 1.12rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* Glass Panel Utility */
.glass-panel {
  background: var(--bg-surface);
  background-image: var(--card-gradient);
  border: 1px solid var(--bg-surface-glass-border);
  border-radius: 20px;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: var(--shadow-sm);
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.glass-panel:hover {
  border-color: var(--border-medium);
  box-shadow: var(--shadow-md);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero-section {
  padding-top: 150px;
  padding-bottom: 72px;
  text-align: center;
  position: relative;
}

.hero-title {
  font-size: clamp(2.6rem, 5.2vw, 4.4rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.15;
  margin-bottom: 24px;
  max-width: 960px;
  margin-left: auto;
  margin-right: auto;
}

.hero-title .gradient-text {
  background: linear-gradient(135deg, #0A84FF 10%, #5AC8FA 60%, #30D158 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: clamp(1.1rem, 2vw, 1.3rem);
  color: var(--text-secondary);
  max-width: 780px;
  margin: 0 auto 36px;
  line-height: 1.6;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 20px;
}

.hero-meta-badges {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 18px;
  color: var(--text-muted);
  font-size: 0.88rem;
  font-family: var(--font-sans);
  margin-bottom: 60px;
}

.hero-meta-badges span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* ==========================================================================
   Hero Desktop App Showcase Mockup
   ========================================================================== */
.mockup-wrapper {
  max-width: 1040px;
  margin: 0 auto;
  perspective: 1200px;
}

.desktop-app-window {
  border-radius: 16px;
  border: 1px solid var(--border-medium);
  background: var(--bg-surface);
  box-shadow: 0 30px 90px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(255, 255, 255, 0.05);
  overflow: hidden;
  text-align: left;
  transform: rotateX(2deg);
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.4s ease;
}

.desktop-app-window:hover {
  transform: rotateX(0deg) translateY(-4px);
  box-shadow: 0 36px 110px rgba(0, 0, 0, 0.65), 0 0 40px var(--accent-blue-glow);
}

.window-titlebar {
  height: 44px;
  background: rgba(18, 18, 22, 0.8);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
}

[data-theme="white"] .window-titlebar {
  background: rgba(240, 240, 245, 0.85);
}

.window-controls {
  display: flex;
  align-items: center;
  gap: 8px;
}

.win-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}
.dot-close { background: #FF5F56; }
.dot-min { background: #FFBD2E; }
.dot-max { background: #27C93F; }

.window-title-text {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.window-stats {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-green);
  display: flex;
  align-items: center;
  gap: 6px;
}

.app-canvas {
  display: grid;
  grid-template-columns: 240px 1fr;
  min-height: 480px;
}

.app-sidebar {
  background: rgba(15, 15, 18, 0.6);
  border-right: 1px solid var(--border-subtle);
  padding: 18px 12px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

[data-theme="white"] .app-sidebar {
  background: rgba(245, 245, 248, 0.7);
}

.sidebar-menu {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.sidebar-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border-radius: 8px;
  font-size: 0.88rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.sidebar-item.active {
  background: var(--bg-surface-elevated);
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
}

.sidebar-count {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  padding: 1px 7px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
}

.sidebar-bottom-spec {
  padding: 12px;
  background: var(--bg-surface-elevated);
  border-radius: 10px;
  border: 1px solid var(--border-subtle);
  font-size: 0.76rem;
}

.spec-title {
  color: var(--text-muted);
  margin-bottom: 4px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.spec-value {
  font-family: var(--font-mono);
  color: var(--accent-blue);
  font-weight: 600;
}

.app-main-content {
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.app-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.search-fake {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 0.84rem;
  color: var(--text-muted);
  width: 260px;
}

.active-download-card {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-medium);
  border-radius: 14px;
  padding: 20px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
}

.file-row-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 14px;
}

.file-icon-box {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: rgba(10, 132, 255, 0.12);
  color: var(--accent-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}

.file-info {
  margin-left: 14px;
  flex: 1;
}

.file-name {
  font-weight: 600;
  font-size: 0.98rem;
  margin-bottom: 2px;
}

.file-submeta {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
}

.download-speed-badge {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent-blue);
}

/* Multi-Segment Visual Rail inside mockup */
.segments-rail-wrap {
  margin: 16px 0 12px;
}

.rail-label-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.78rem;
  font-family: var(--font-mono);
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.segmented-progress-bar {
  display: flex;
  gap: 3px;
  height: 12px;
  border-radius: 6px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.05);
  padding: 2px;
}

[data-theme="white"] .segmented-progress-bar {
  background: rgba(0, 0, 0, 0.05);
}

.seg-chunk {
  height: 100%;
  border-radius: 3px;
  background: var(--accent-blue);
  transition: width 0.3s ease;
  position: relative;
}

.seg-chunk.streaming {
  background: linear-gradient(90deg, var(--accent-blue) 0%, var(--accent-cyan) 100%);
  animation: pulse-stream 1.5s infinite alternate;
}

.seg-chunk.done {
  background: var(--accent-green);
}

@keyframes pulse-stream {
  0% { filter: brightness(0.9); }
  100% { filter: brightness(1.25); }
}

.seg-threads-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.76rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* ==========================================================================
   Simulator Section (Interactive Dynamic Work-Stealing)
   ========================================================================== */
.sim-container {
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: 20px;
  padding: 32px;
  box-shadow: var(--shadow-md);
}

.sim-control-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 28px;
}

.sim-status-group {
  display: flex;
  align-items: center;
  gap: 16px;
}

.sim-speed-counter {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--accent-blue);
}

.sim-grid-compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  margin-bottom: 28px;
}

.sim-card {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 14px;
  padding: 24px;
  position: relative;
  overflow: hidden;
}

.sim-card.loadin-card {
  border-color: rgba(10, 132, 255, 0.35);
  box-shadow: 0 0 24px rgba(10, 132, 255, 0.08);
}

.sim-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
}

.sim-card-title {
  font-size: 1.05rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
}

.sim-threads-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 20px;
}

.thread-row {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.thread-header {
  display: flex;
  justify-content: space-between;
  font-size: 0.78rem;
  font-family: var(--font-mono);
  color: var(--text-secondary);
}

.thread-bar-track {
  height: 8px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 4px;
  overflow: hidden;
  position: relative;
}

[data-theme="white"] .thread-bar-track {
  background: rgba(0, 0, 0, 0.06);
}

.thread-bar-fill {
  height: 100%;
  width: 0%;
  border-radius: 4px;
  background: var(--accent-blue);
  transition: width 0.15s linear;
}

.thread-bar-fill.stalled {
  background: var(--accent-orange);
}

.thread-bar-fill.stolen {
  background: var(--accent-purple);
}

.thread-bar-fill.complete {
  background: var(--accent-green);
}

.sim-result-badge {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  font-weight: 600;
  padding: 10px 14px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.sim-log-terminal {
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  border-radius: 12px;
  padding: 14px 18px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-secondary);
  height: 110px;
  overflow-y: auto;
  line-height: 1.6;
}

.log-entry-stealing {
  color: var(--accent-cyan);
}
.log-entry-success {
  color: var(--accent-green);
}
.log-entry-warn {
  color: var(--accent-orange);
}

/* ==========================================================================
   Hardware Spec Advisor Section
   ========================================================================== */
.spec-advisor-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: 20px;
  padding: 36px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px;
  align-items: center;
}

.spec-info-col h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.spec-info-col p {
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.spec-detected-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.spec-chip {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  padding: 14px 18px;
  border-radius: 12px;
}

.spec-chip-label {
  font-size: 0.76rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: 4px;
}

.spec-chip-value {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  font-family: var(--font-mono);
}

.spec-result-col {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-medium);
  border-radius: 16px;
  padding: 28px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.spec-result-highlight {
  font-size: 3.5rem;
  font-weight: 800;
  font-family: var(--font-mono);
  color: var(--accent-blue);
  line-height: 1;
  margin: 12px 0 6px;
}

.spec-result-sub {
  font-size: 0.92rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.spec-slider-box {
  text-align: left;
  margin-top: 16px;
}

.slider-label-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  font-family: var(--font-mono);
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.range-slider {
  width: 100%;
  accent-color: var(--accent-blue);
  cursor: pointer;
}

/* ==========================================================================
   Features Bento Grid
   ========================================================================== */
.bento-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.bento-card {
  padding: 32px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
}

.bento-col-span-2 {
  grid-column: span 2;
}

.bento-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: rgba(10, 132, 255, 0.12);
  color: var(--accent-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.bento-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.bento-desc {
  font-size: 0.96rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.bento-code-snippet {
  margin-top: 20px;
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  padding: 12px 16px;
  border-radius: 10px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-cyan);
  overflow-x: auto;
}

/* ==========================================================================
   Benchmark & Comparison Table
   ========================================================================== */
.benchmark-table-wrap {
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: 18px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.benchmark-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.benchmark-table th,
.benchmark-table td {
  padding: 18px 24px;
  border-bottom: 1px solid var(--border-subtle);
}

.benchmark-table th {
  background: var(--bg-surface-elevated);
  font-weight: 700;
  font-size: 0.88rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.benchmark-table td {
  font-size: 0.94rem;
}

.benchmark-table tr.highlight-row {
  background: rgba(10, 132, 255, 0.05);
}

.benchmark-table tr.highlight-row td {
  color: var(--text-primary);
  font-weight: 600;
}

.pill-fast {
  background: rgba(48, 209, 88, 0.15);
  color: var(--accent-green);
  border: 1px solid rgba(48, 209, 88, 0.3);
  padding: 3px 8px;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
}

/* ==========================================================================
   Browser Extension Section
   ========================================================================== */
.extension-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px;
  align-items: center;
}

.extension-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 12px;
}

.ext-tab-btn {
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: all 0.2s;
}

.ext-tab-btn.active {
  background: var(--bg-surface-elevated);
  color: var(--accent-blue);
  border: 1px solid var(--border-medium);
}

.steps-list {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.step-card {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.step-number {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--accent-blue);
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  flex-shrink: 0;
}

.step-content h4 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.step-content p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.code-copy-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  padding: 4px 10px;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  margin-top: 6px;
  cursor: pointer;
  color: var(--accent-cyan);
}

/* ==========================================================================
   Download Hub Section (High-Contrast Segmented Controller)
   ========================================================================== */
.os-tabs-wrap {
  display: flex;
  justify-content: center;
  align-items: center;
  margin: 0 auto 48px auto;
  max-width: 640px;
  width: 100%;
  clear: both;
}

.os-tabs-nav {
  display: flex;
  width: 100%;
  padding: 6px;
  border-radius: 999px;
  background: #1C1C22;
  border: 1px solid rgba(255, 255, 255, 0.16);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  gap: 6px;
}

[data-theme="white"] .os-tabs-nav {
  background: #EBEBF0;
  border: 1px solid rgba(0, 0, 0, 0.14);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

.os-tab-btn {
  flex: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 20px;
  border-radius: 999px;
  font-size: 0.96rem;
  font-weight: 700;
  border: none;
  outline: none;
  background: transparent;
  color: #A1A1AA;
  cursor: pointer;
  transition: all 0.22s cubic-bezier(0.16, 1, 0.3, 1);
  white-space: nowrap;
}

[data-theme="white"] .os-tab-btn {
  color: #52525B;
}

.os-tab-btn:hover {
  color: #FFFFFF;
  background: rgba(255, 255, 255, 0.08);
}

[data-theme="white"] .os-tab-btn:hover {
  color: #18181B;
  background: rgba(0, 0, 0, 0.05);
}

.os-tab-btn.active {
  background: var(--accent-blue) !important;
  color: #FFFFFF !important;
  box-shadow: 0 4px 18px rgba(10, 132, 255, 0.45) !important;
}

.os-tab-btn svg {
  flex-shrink: 0;
  transition: transform 0.2s ease;
}

.os-tab-btn.active svg {
  transform: scale(1.08);
}

.download-cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 40px;
  width: 100%;
  clear: both;
}

.dl-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: 20px;
  padding: 32px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  margin-top: 0;
}

.dl-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-blue);
  box-shadow: 0 16px 48px var(--accent-blue-glow);
}

.dl-card.recommended {
  border-color: var(--accent-blue);
  background: linear-gradient(180deg, rgba(10, 132, 255, 0.08) 0%, var(--bg-surface) 60%);
}

.card-top-badge {
  position: absolute;
  top: 16px;
  right: 16px;
  background: var(--accent-blue);
  color: #FFFFFF;
  font-size: 0.74rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.dl-card-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--bg-surface-elevated);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-blue);
  margin-bottom: 20px;
}

.dl-card-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.dl-card-fileinfo {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.dl-card-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 28px;
}

.dl-card-features li {
  font-size: 0.9rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.dl-card-features li svg {
  color: var(--accent-green);
  flex-shrink: 0;
}

/* Hash verification pill */
.hash-verify-box {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 14px;
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.hash-label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.hash-code {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-cyan);
  word-break: break-all;
}

/* ==========================================================================
   FAQ Section
   ========================================================================== */
.faq-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.faq-item {
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: 16px;
  padding: 24px;
  cursor: pointer;
  transition: all 0.2s ease;
}

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

.faq-question {
  font-size: 1.05rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.faq-answer {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-top: 12px;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-surface);
  padding: 64px 0 36px;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 36px;
  margin-bottom: 48px;
}

.footer-brand-col {
  max-width: 320px;
}

.footer-desc {
  margin-top: 12px;
  line-height: 1.6;
  color: var(--text-muted);
}

.footer-links-grid {
  display: flex;
  gap: 64px;
  flex-wrap: wrap;
}

.footer-col h5 {
  color: var(--text-primary);
  font-weight: 600;
  margin-bottom: 16px;
  font-size: 0.94rem;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col a:hover {
  color: var(--accent-blue);
}

.footer-bottom {
  border-top: 1px solid var(--border-subtle);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ==========================================================================
   404 Page Specifics
   ========================================================================== */
.error-page-body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.error-card {
  max-width: 520px;
  padding: 48px;
  text-align: center;
}

.error-badge {
  font-family: var(--font-mono);
  font-size: 0.84rem;
  font-weight: 700;
  color: var(--accent-orange);
  margin-bottom: 16px;
  letter-spacing: 0.08em;
}

.error-title {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 14px;
}

.error-desc {
  color: var(--text-secondary);
  margin-bottom: 32px;
}

.error-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
}

/* ==========================================================================
   Responsive Media Queries
   ========================================================================== */
@media (max-width: 1024px) {
  .app-canvas {
    grid-template-columns: 1fr;
  }
  .app-sidebar {
    display: none;
  }
  .bento-grid {
    grid-template-columns: 1fr 1fr;
  }
  .bento-col-span-2 {
    grid-column: span 2;
  }
  .spec-advisor-box,
  .sim-grid-compare,
  .extension-container {
    grid-template-columns: 1fr;
  }
  .download-cards-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .os-tabs-nav {
    border-radius: 18px;
    flex-direction: column;
    padding: 6px;
  }
  .os-tab-btn {
    width: 100%;
    padding: 11px 16px;
    font-size: 0.9rem;
    border-radius: 12px;
  }
  .nav-links,
  .nav-actions .nav-cta {
    display: none;
  }
  .mobile-menu-btn {
    display: flex;
  }
  .bento-grid {
    grid-template-columns: 1fr;
  }
  .bento-col-span-2 {
    grid-column: span 1;
  }
  .faq-grid {
    grid-template-columns: 1fr;
  }
  .hero-title {
    font-size: 2.3rem;
  }
  .section-title {
    font-size: 2rem;
  }
}