@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;600;700&family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&display=swap');

/* ==========================================================================
   Nova Explorer - Modern Landing Page Design System
   Crafted with vanilla CSS for maximum speed, precision & zero vibe-coded fluff
   ========================================================================== */

:root {
  /* Color Palette - Dark Engine (Default) */
  --bg-base: #060911;
  --bg-surface: #0c121e;
  --bg-elevated: #131c2e;
  --bg-card: #0f1728;
  --bg-card-hover: #162035;
  --bg-input: #090e18;

  --border-subtle: rgba(255, 255, 255, 0.07);
  --border-medium: rgba(255, 255, 255, 0.12);
  --border-strong: rgba(255, 255, 255, 0.22);
  --border-accent: rgba(6, 182, 212, 0.4);

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-subtle: #475569;

  --accent-cyan: #06b6d4;
  --accent-cyan-hover: #22d3ee;
  --accent-cyan-bg: rgba(6, 182, 212, 0.1);
  --accent-cyan-glow: rgba(6, 182, 212, 0.25);

  --accent-indigo: #6366f1;
  --accent-emerald: #10b981;
  --accent-emerald-bg: rgba(16, 185, 129, 0.1);
  --accent-amber: #f59e0b;
  --accent-rose: #f43f5e;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 14px -1px rgba(0, 0, 0, 0.4), 0 2px 6px -1px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 16px 36px -4px rgba(0, 0, 0, 0.5), 0 6px 16px -2px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 35px -5px rgba(6, 182, 212, 0.18);

  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;

  --radius-xs: 4px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  --transition-fast: 150ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-base: 240ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-smooth: 350ms cubic-bezier(0.16, 1, 0.3, 1);

  --grid-color: rgba(255, 255, 255, 0.035);
  --dot-color: rgba(255, 255, 255, 0.08);
}

[data-theme="light"] {
  --bg-base: #f8fafc;
  --bg-surface: #ffffff;
  --bg-elevated: #f1f5f9;
  --bg-card: #ffffff;
  --bg-card-hover: #f8fafc;
  --bg-input: #ffffff;

  --border-subtle: rgba(15, 23, 42, 0.08);
  --border-medium: rgba(15, 23, 42, 0.14);
  --border-strong: rgba(15, 23, 42, 0.26);
  --border-accent: rgba(8, 145, 178, 0.5);

  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --text-subtle: #94a3b8;

  --accent-cyan: #0891b2;
  --accent-cyan-hover: #0e7490;
  --accent-cyan-bg: rgba(8, 145, 178, 0.08);
  --accent-cyan-glow: rgba(8, 145, 178, 0.2);

  --accent-indigo: #4f46e5;
  --accent-emerald: #059669;
  --accent-emerald-bg: rgba(5, 150, 105, 0.08);
  --accent-amber: #d97706;
  --accent-rose: #e11d48;

  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 4px 16px -2px rgba(15, 23, 42, 0.08), 0 2px 6px -1px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 20px 40px -8px rgba(15, 23, 42, 0.12), 0 8px 16px -4px rgba(15, 23, 42, 0.06);
  --shadow-glow: 0 0 35px -5px rgba(8, 145, 178, 0.15);

  --grid-color: rgba(15, 23, 42, 0.04);
  --dot-color: rgba(15, 23, 42, 0.08);
}

/* ==========================================================================
   Global Reset & Base Layout
   ========================================================================== */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-sans);
  background-color: var(--bg-base);
  color: var(--text-primary);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 50% 0%, var(--accent-cyan-bg) 0%, transparent 45%),
    linear-gradient(to right, var(--grid-color) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-color) 1px, transparent 1px);
  background-size: 100% 100%, 48px 48px, 48px 48px;
  background-position: 0 0, -1px -1px, -1px -1px;
}

/* Container constraints */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.container-wide {
  width: 100%;
  max-width: 1360px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ==========================================================================
   Header & Navigation Bar
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(6, 9, 17, 0.85);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-subtle);
  transition: background-color var(--transition-base), border-color var(--transition-base);
}

[data-theme="light"] .site-header {
  background-color: rgba(248, 250, 252, 0.88);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.logo-group {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: inherit;
}

.logo-icon {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  box-shadow: 0 2px 8px var(--accent-cyan-glow);
}

.brand-text {
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 8px;
}

.version-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  padding: 2px 7px;
  border-radius: var(--radius-full);
  background: var(--accent-cyan-bg);
  color: var(--accent-cyan);
  border: 1px solid var(--border-accent);
}

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

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
  transition: color var(--transition-fast);
}

.nav-link:hover {
  color: var(--text-primary);
}

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

.theme-toggle-btn {
  background: transparent;
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

.theme-toggle-btn svg {
  width: 18px;
  height: 18px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-sans);
  font-size: 0.92rem;
  font-weight: 600;
  padding: 9px 18px;
  border-radius: var(--radius-md);
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-base);
  border: 1px solid transparent;
}

.btn-sm {
  padding: 6px 14px;
  font-size: 0.84rem;
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: 13px 26px;
  font-size: 1.02rem;
  border-radius: var(--radius-md);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-cyan) 0%, #0284c7 100%);
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.15);
  box-shadow: 0 4px 14px var(--accent-cyan-glow);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--accent-cyan-hover) 0%, #0369a1 100%);
  box-shadow: 0 6px 20px var(--accent-cyan-glow);
  transform: translateY(-1px);
}

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

.btn-secondary:hover {
  background: var(--bg-elevated);
  border-color: var(--border-strong);
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
}

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

/* ==========================================================================
   Hero Section
   ========================================================================== */

.hero-section {
  padding: 72px 0 84px 0;
  text-align: center;
  position: relative;
}

.announcement-chip {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 5px 14px;
  border-radius: var(--radius-full);
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  font-size: 0.82rem;
  color: var(--text-secondary);
  text-decoration: none;
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

.announcement-chip:hover {
  border-color: var(--accent-cyan);
  color: var(--text-primary);
  transform: translateY(-1px);
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent-cyan);
  position: relative;
}

.pulse-dot::after {
  content: '';
  position: absolute;
  top: -3px;
  left: -3px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background-color: var(--accent-cyan);
  opacity: 0.4;
  animation: pulse-ring 2s infinite cubic-bezier(0.215, 0.61, 0.355, 1);
}

@keyframes pulse-ring {
  0% { transform: scale(0.6); opacity: 0.8; }
  100% { transform: scale(1.6); opacity: 0; }
}

.hero-title {
  font-size: clamp(2.4rem, 5.2vw, 4.2rem);
  font-weight: 800;
  letter-spacing: -0.035em;
  line-height: 1.1;
  max-width: 980px;
  margin: 0 auto 20px auto;
  color: var(--text-primary);
}

.hero-title .gradient-text {
  background: linear-gradient(135deg, var(--text-primary) 30%, var(--accent-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--text-secondary);
  max-width: 760px;
  margin: 0 auto 36px auto;
  line-height: 1.6;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 32px;
}

.terminal-install-bar {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  background: var(--bg-input);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  padding: 8px 16px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-secondary);
  box-shadow: var(--shadow-sm);
}

.terminal-prompt {
  color: var(--accent-cyan);
  user-select: none;
}

.copy-cmd-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  padding: 4px;
  border-radius: var(--radius-xs);
  transition: all var(--transition-fast);
}

.copy-cmd-btn:hover {
  color: var(--text-primary);
  background: var(--bg-surface);
}

/* ==========================================================================
   Metrics Bar
   ========================================================================== */

.metrics-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin: 0 auto 56px auto;
  max-width: 1040px;
}

.metric-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  text-align: left;
  transition: all var(--transition-base);
}

.metric-card:hover {
  border-color: var(--border-medium);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.metric-number {
  font-family: var(--font-mono);
  font-size: 1.65rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--accent-cyan);
  margin-bottom: 4px;
}

.metric-label {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.metric-sub {
  font-size: 0.76rem;
  color: var(--text-muted);
}

/* ==========================================================================
   Interactive Hero Product Showcase (Interactive Replica)
   ========================================================================== */

.showcase-container {
  margin: 0 auto 96px auto;
  max-width: 1240px;
}

.showcase-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 16px;
  padding: 0 4px;
}

.showcase-mode-pills {
  display: flex;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 4px;
  gap: 4px;
}

.mode-pill {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all var(--transition-fast);
}

.mode-pill.active {
  background: var(--accent-cyan);
  color: #ffffff;
  box-shadow: 0 2px 8px var(--accent-cyan-glow);
}

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

/* The Realistic Window Frame */
.mockup-window {
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  overflow: hidden;
  transition: all var(--transition-smooth);
}

.mockup-titlebar {
  height: 42px;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 14px;
  user-select: none;
}

.mockup-traffic-lights {
  display: flex;
  align-items: center;
  gap: 8px;
}

.traffic-light {
  width: 11px;
  height: 11px;
  border-radius: 50%;
}

.traffic-light.close { background: #ef4444; }
.traffic-light.min { background: #f59e0b; }
.traffic-light.max { background: #10b981; }

.mockup-tabs {
  display: flex;
  align-items: center;
  gap: 4px;
  height: 100%;
}

.mockup-tab {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  font-weight: 500;
  padding: 4px 12px;
  height: 32px;
  border-radius: var(--radius-xs);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.mockup-tab.active {
  background: var(--bg-card);
  color: var(--text-primary);
  border-top: 2px solid var(--accent-cyan);
  font-weight: 600;
}

.mockup-actions {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--text-muted);
}

.mockup-action-btn {
  background: transparent;
  border: none;
  color: inherit;
  padding: 4px 6px;
  border-radius: var(--radius-xs);
  cursor: pointer;
  display: flex;
  align-items: center;
}

.mockup-action-btn:hover {
  color: var(--text-primary);
  background: var(--bg-elevated);
}

/* Mockup Body: Explorer layout */
.mockup-body {
  display: grid;
  grid-template-columns: 210px 1fr;
  min-height: 480px;
  background: var(--bg-card);
}

/* Sidebar */
.mockup-sidebar {
  background: var(--bg-surface);
  border-right: 1px solid var(--border-subtle);
  padding: 14px 10px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.sidebar-section-title {
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  padding: 0 8px 4px 8px;
}

.sidebar-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.sidebar-item {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 6px 10px;
  border-radius: var(--radius-xs);
  font-size: 0.82rem;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.sidebar-item:hover, .sidebar-item.active {
  background: var(--bg-elevated);
  color: var(--text-primary);
}

.sidebar-item.active {
  color: var(--accent-cyan);
  font-weight: 600;
}

.drive-bar-mini {
  height: 4px;
  border-radius: 2px;
  background: var(--border-medium);
  width: 100%;
  margin-top: 4px;
  overflow: hidden;
}

.drive-bar-fill {
  height: 100%;
  background: var(--accent-cyan);
  width: 68%;
}

/* Main Content Area in Mockup */
.mockup-main {
  display: flex;
  flex-direction: column;
}

.mockup-addressbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border-subtle);
  background: var(--bg-card);
}

.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.crumb {
  padding: 2px 6px;
  border-radius: var(--radius-xs);
  cursor: pointer;
}

.crumb:hover {
  background: var(--bg-elevated);
  color: var(--text-primary);
}

.crumb-active {
  color: var(--accent-cyan);
  font-weight: 600;
}

.mockup-search-input {
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 4px 10px;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  color: var(--text-primary);
  width: 180px;
  outline: none;
  transition: border-color var(--transition-fast);
}

.mockup-search-input:focus {
  border-color: var(--accent-cyan);
}

/* Dual Panes Grid */
.mockup-panes-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  flex: 1;
  border-bottom: 1px solid var(--border-subtle);
}

.mockup-panes-grid.single-mode {
  grid-template-columns: 1fr;
}

.mockup-pane {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.mockup-pane:first-child {
  border-right: 1px solid var(--border-subtle);
}

.pane-header-strip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 14px;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
}

.file-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8rem;
  text-align: left;
}

.file-table th {
  padding: 6px 12px;
  font-weight: 600;
  font-size: 0.72rem;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border-subtle);
}

.file-table td {
  padding: 7px 12px;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-secondary);
}

.file-row {
  cursor: pointer;
  transition: background var(--transition-fast);
}

.file-row:hover {
  background: var(--bg-elevated);
  color: var(--text-primary);
}

.file-row.selected {
  background: var(--accent-cyan-bg);
  color: var(--accent-cyan);
  font-weight: 600;
}

.file-name-cell {
  display: flex;
  align-items: center;
  gap: 8px;
}

.file-icon {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

/* Super Transfer Banner (in Transfer View) */
.transfer-progress-card {
  margin: 14px;
  padding: 16px;
  background: var(--bg-surface);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.transfer-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

.transfer-title {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.transfer-speed {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent-emerald);
}

.transfer-bar-track {
  height: 6px;
  background: var(--bg-elevated);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 8px;
}

.transfer-bar-fill {
  height: 100%;
  width: 64%;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-emerald));
  animation: pulse-transfer 2s infinite ease-in-out;
}

@keyframes pulse-transfer {
  0% { opacity: 0.85; }
  50% { opacity: 1; }
  100% { opacity: 0.85; }
}

.transfer-stats-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.74rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* QuickLook Overlay in Mockup */
.mockup-quicklook-overlay {
  margin: 16px;
  padding: 16px;
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  display: flex;
  gap: 16px;
}

.quicklook-preview-box {
  width: 180px;
  height: 180px;
  background: var(--bg-base);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-cyan);
}

.quicklook-info {
  flex: 1;
}

.quicklook-title {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.quicklook-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent-cyan);
  background: var(--accent-cyan-bg);
  padding: 2px 6px;
  border-radius: var(--radius-xs);
  margin-bottom: 12px;
}

.quicklook-code-snippet {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  background: var(--bg-base);
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  line-height: 1.45;
  border: 1px solid var(--border-subtle);
}

/* Status bar */
.mockup-statusbar {
  height: 28px;
  background: var(--bg-surface);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 14px;
  font-size: 0.74rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* ==========================================================================
   Engineering Feature Grid (Clean, Editorial, Concrete)
   ========================================================================== */

.section {
  padding: 84px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 56px auto;
}

.section-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent-cyan);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(2rem, 3.4vw, 2.75rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: 14px;
  line-height: 1.15;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: all var(--transition-base);
  position: relative;
  display: flex;
  flex-direction: column;
}

.feature-card:hover {
  border-color: var(--border-medium);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.feature-card.featured-card {
  grid-column: span 2;
  background: linear-gradient(145deg, var(--bg-surface) 0%, var(--bg-card) 100%);
  border-color: var(--border-medium);
}

.feature-icon-box {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--accent-cyan-bg);
  border: 1px solid var(--border-accent);
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.feature-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  margin-bottom: 10px;
}

.feature-desc {
  font-size: 0.94rem;
  color: var(--text-secondary);
  line-height: 1.55;
  margin-bottom: 20px;
  flex: 1;
}

.feature-spec-list {
  list-style: none;
  border-top: 1px solid var(--border-subtle);
  padding-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

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

.spec-check {
  color: var(--accent-emerald);
  font-weight: bold;
}

/* ==========================================================================
   Benchmark Matrix Table
   ========================================================================== */

.benchmark-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 36px 32px;
  box-shadow: var(--shadow-md);
  overflow-x: auto;
}

.benchmark-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 640px;
}

.benchmark-table th {
  padding: 14px 18px;
  text-align: left;
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border-medium);
}

.benchmark-table th.highlight-col {
  color: var(--accent-cyan);
  background: var(--accent-cyan-bg);
  border-top-left-radius: var(--radius-sm);
  border-top-right-radius: var(--radius-sm);
}

.benchmark-table td {
  padding: 16px 18px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-subtle);
}

.benchmark-table td.highlight-col {
  background: var(--accent-cyan-bg);
  font-weight: 600;
  color: var(--text-primary);
}

.benchmark-badge-win {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--accent-emerald);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* ==========================================================================
   Keyboard Shortcut Matrix
   ========================================================================== */

.shortcut-filter-group {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}

.shortcut-filter-btn {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.shortcut-filter-btn.active, .shortcut-filter-btn:hover {
  border-color: var(--accent-cyan);
  color: var(--text-primary);
  background: var(--accent-cyan-bg);
}

.shortcuts-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.shortcut-item {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: all var(--transition-base);
}

.shortcut-item:hover {
  border-color: var(--border-medium);
  transform: translateY(-2px);
}

.shortcut-keys {
  display: flex;
  gap: 4px;
}

kbd {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 600;
  padding: 4px 8px;
  border-radius: var(--radius-xs);
  background: var(--bg-elevated);
  border: 1px solid var(--border-medium);
  box-shadow: 0 2px 0 var(--border-strong);
  color: var(--text-primary);
}

.shortcut-label {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
}

/* ==========================================================================
   Architecture & Tech Stack Breakdown
   ========================================================================== */

.arch-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.arch-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
  text-align: left;
}

.arch-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent-cyan);
  font-weight: 600;
  margin-bottom: 8px;
}

.arch-name {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.arch-detail {
  font-size: 0.86rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ==========================================================================
   Download Section / Cards
   ========================================================================== */

.downloads-wrapper {
  background: linear-gradient(180deg, var(--bg-surface) 0%, var(--bg-card) 100%);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-xl);
  padding: 56px 48px;
  text-align: center;
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
}

.downloads-wrapper::before {
  content: '';
  position: absolute;
  top: -50px;
  right: -50px;
  width: 250px;
  height: 250px;
  background: radial-gradient(circle, var(--accent-cyan-glow) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.download-options-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin: 40px 0 32px 0;
  text-align: left;
}

.download-card {
  background: var(--bg-base);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-base);
}

.download-card:hover {
  border-color: var(--accent-cyan);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.download-card.primary-installer {
  border-color: var(--border-accent);
  background: linear-gradient(160deg, var(--bg-base) 0%, var(--bg-elevated) 100%);
}

.download-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--accent-emerald);
  background: var(--accent-emerald-bg);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  align-self: flex-start;
  margin-bottom: 14px;
}

.download-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.download-fileinfo {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.download-card-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 24px;
  flex: 1;
}

/* ==========================================================================
   App-Based Modals (No native alerts/prompts)
   ========================================================================== */

.app-modal-backdrop {
  position: fixed;
  inset: 0;
  background-color: rgba(6, 9, 17, 0.75);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}

.app-modal-backdrop.open {
  opacity: 1;
  pointer-events: auto;
}

.app-modal {
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-xl);
  width: 100%;
  max-width: 560px;
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  transform: scale(0.96);
  transition: transform var(--transition-base);
  overflow: hidden;
}

.app-modal-backdrop.open .app-modal {
  transform: scale(1);
}

.app-modal-header {
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.app-modal-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
}

.app-modal-close-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
  border-radius: var(--radius-xs);
  display: flex;
  align-items: center;
  justify-content: center;
}

.app-modal-close-btn:hover {
  color: var(--text-primary);
  background: var(--bg-elevated);
}

.app-modal-body {
  padding: 24px;
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.app-modal-footer {
  padding: 16px 24px;
  background: var(--bg-elevated);
  border-top: 1px solid var(--border-subtle);
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
  border-top: 1px solid var(--border-subtle);
  padding: 56px 0 40px 0;
  background: var(--bg-surface);
  font-size: 0.88rem;
  color: var(--text-muted);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 24px;
}

.footer-nav {
  display: flex;
  gap: 24px;
  list-style: none;
}

.footer-nav a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-nav a:hover {
  color: var(--text-primary);
}

/* ==========================================================================
   Responsive Adaptations
   ========================================================================== */

@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .feature-card.featured-card {
    grid-column: span 2;
  }
  .arch-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .download-options-grid {
    grid-template-columns: 1fr;
  }
  .metrics-row {
    grid-template-columns: repeat(2, 1fr);
  }
  .shortcuts-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .feature-card.featured-card {
    grid-column: span 1;
  }
  .mockup-body {
    grid-template-columns: 1fr;
  }
  .mockup-sidebar {
    display: none;
  }
  .mockup-panes-grid {
    grid-template-columns: 1fr;
  }
  .mockup-pane:last-child {
    display: none;
  }
  .shortcuts-grid {
    grid-template-columns: 1fr;
  }
  .metrics-row {
    grid-template-columns: 1fr;
  }
  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}