/* ============================================
   ModelAny Landing Page Styles
   Theme: Light purple/blue gradient AI network
   ============================================ */

/* --- Design Tokens --- */
:root {
  /* Brand colors */
  --brand-primary: #6D5DFB;
  --brand-primary-dark: #5848E8;
  --brand-secondary: #55B8FF;
  --brand-accent: #8B7CFF;
  --brand-lavender: #EDE9FE;
  --brand-mist: #F8F7FF;

  /* Text */
  --ink: #1A1A2E;
  --ink-soft: #4A4A68;
  --ink-muted: #7A7A92;
  --ink-light: #9E9EB2;

  /* Surfaces */
  --surface: #FFFFFF;
  --surface-tint: #FAFAFFF8;
  --surface-soft: #F5F4FF;

  /* Borders */
  --border: #E8E5F5;
  --border-soft: #F0EEFA;

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #6D5DFB 0%, #8B7CFF 50%, #55B8FF 100%);
  --gradient-soft: linear-gradient(180deg, #F8F7FF 0%, #EDE9FE 100%);
  --gradient-hero-bg: linear-gradient(180deg, #FFFFFF 0%, #F8F7FF 40%, #EDE9FE 100%);
  --gradient-cta: linear-gradient(135deg, #EDE9FE 0%, #DCE9FF 50%, #D4E4FF 100%);
  --gradient-text: linear-gradient(135deg, #6D5DFB 0%, #55B8FF 100%);

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(109, 93, 251, 0.04);
  --shadow-sm: 0 2px 8px rgba(109, 93, 251, 0.06), 0 1px 2px rgba(109, 93, 251, 0.04);
  --shadow-md: 0 8px 24px rgba(109, 93, 251, 0.08), 0 2px 8px rgba(109, 93, 251, 0.05);
  --shadow-lg: 0 20px 48px rgba(109, 93, 251, 0.12), 0 8px 16px rgba(109, 93, 251, 0.06);
  --shadow-xl: 0 32px 64px rgba(109, 93, 251, 0.16), 0 16px 32px rgba(85, 184, 255, 0.08);
  --shadow-glow: 0 0 40px rgba(109, 93, 251, 0.25);

  /* Radii */
  --radius-sm: 12px;
  --radius-md: 16px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-pill: 999px;

  /* Layout */
  --container-max: 1200px;
  --container-pad: 24px;

  /* Transitions */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --dur-fast: 150ms;
  --dur: 250ms;
  --dur-slow: 400ms;

  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  color-scheme: light;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 72px;
}

body {
  font-family: inherit;
  background: var(--surface);
  color: var(--ink);
  line-height: 1.6;
  overflow-x: hidden;
}

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

img {
  display: block;
  max-width: 100%;
  height: auto;
}

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

ul {
  list-style: none;
}

/* --- Accessibility --- */
.skip-link {
  position: absolute;
  top: -100px;
  left: 0;
  z-index: 9999;
  padding: 12px 24px;
  background: var(--brand-primary);
  color: white;
  border-radius: 0 0 var(--radius-md) 0;
  font-weight: 600;
  transition: top var(--dur) var(--ease);
}

.skip-link:focus {
  top: 0;
}

:focus-visible {
  outline: 3px solid rgba(109, 93, 251, 0.5);
  outline-offset: 2px;
  border-radius: 4px;
}

/* --- Layout --- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad);
}

.section {
  padding: 96px 0;
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 64px;
}

.section-header h2 {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
  color: var(--ink);
}

.section-subtitle {
  font-size: 18px;
  color: var(--ink-soft);
  margin-bottom: 4px;
}

.section-subtitle-zh {
  font-size: 15px;
  color: var(--ink-muted);
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  font-size: 15px;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  transition: all var(--dur) var(--ease);
  white-space: nowrap;
  text-decoration: none;
}

.btn-pill {
  border-radius: var(--radius-pill);
}

.btn-primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: 0 4px 16px rgba(109, 93, 251, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(109, 93, 251, 0.4);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background: var(--surface);
  color: var(--ink);
  border: 1.5px solid var(--border);
  box-shadow: var(--shadow-xs);
}

.btn-secondary:hover {
  border-color: var(--brand-accent);
  background: var(--brand-mist);
  transform: translateY(-2px);
}

.btn-large {
  padding: 16px 36px;
  font-size: 17px;
}

/* --- Gradient Text --- */
.gradient-text {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

/* --- Header / Nav --- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid rgba(232, 229, 245, 0.6);
  transition: all var(--dur) var(--ease);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 20px;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.brand-icon {
  border-radius: var(--radius-sm);
  box-shadow: 0 4px 12px rgba(109, 93, 251, 0.2);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-menu a {
  font-size: 15px;
  font-weight: 500;
  color: var(--ink-soft);
  transition: color var(--dur) var(--ease);
  position: relative;
}

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

.nav-menu a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-primary);
  border-radius: 2px;
  transform: scaleX(0);
  transition: transform var(--dur) var(--ease);
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
  transform: scaleX(1);
}

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

.nav-cta {
  padding: 10px 20px;
  font-size: 14px;
}

.nav-download {
  display: none;
}

.menu-open {
  overflow: hidden;
}

.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
}

.menu-bar {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--ink);
  border-radius: 2px;
  transition: all var(--dur) var(--ease);
}

.menu-toggle[aria-expanded="true"] .menu-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] .menu-bar:nth-child(2) {
  opacity: 0;
}

.menu-toggle[aria-expanded="true"] .menu-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* --- Hero --- */
.hero {
  position: relative;
  padding: 120px 0 80px;
  background: var(--gradient-hero-bg);
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.hero-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.5;
}

.hero-blob-1 {
  width: 500px;
  height: 500px;
  top: -100px;
  right: -100px;
  background: radial-gradient(circle, rgba(139, 124, 255, 0.4), transparent 70%);
}

.hero-blob-2 {
  width: 400px;
  height: 400px;
  bottom: -80px;
  left: -80px;
  background: radial-gradient(circle, rgba(85, 184, 255, 0.3), transparent 70%);
}

.hero-blob-3 {
  width: 300px;
  height: 300px;
  top: 40%;
  left: 40%;
  background: radial-gradient(circle, rgba(237, 233, 254, 0.6), transparent 70%);
}

.hero-container {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.hero-content {
  max-width: 560px;
}

.eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--brand-primary);
  background: var(--brand-lavender);
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  margin-bottom: 4px;
}

.eyebrow-zh {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--ink-muted);
  margin-bottom: 16px;
}

.hero-content h1 {
  font-size: clamp(36px, 5.5vw, 56px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 12px;
  color: var(--ink);
}

.hero-subtitle-zh {
  font-size: clamp(20px, 2.5vw, 26px);
  font-weight: 600;
  color: var(--ink-soft);
  margin-bottom: 20px;
}

.hero-description {
  font-size: 17px;
  color: var(--ink-soft);
  margin-bottom: 8px;
  line-height: 1.65;
}

.hero-description-zh {
  font-size: 15px;
  color: var(--ink-muted);
  margin-bottom: 32px;
}

.hero-cta {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.install-availability {
  margin-top: 16px;
  font-size: 13px;
  color: var(--ink-muted);
}

.install-availability span {
  display: inline-block;
  padding: 2px 7px;
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  background: var(--surface-tint);
  color: var(--ink-soft);
  font-size: 11px;
  font-weight: 600;
}

/* --- Hero Visual: Interactive Launcher --- */
.hero-visual {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1;
  max-width: 520px;
  margin: 0 auto;
}

.launcher-card {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 320px;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.8);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl), var(--shadow-glow);
  z-index: 3;
  overflow: hidden;
}

.launcher-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-soft);
}

.launcher-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--border);
}

.launcher-dot:nth-child(1) { background: #FF5F57; }
.launcher-dot:nth-child(2) { background: #FEBC2E; }
.launcher-dot:nth-child(3) { background: #28C840; }

.launcher-title {
  margin-left: auto;
  font-size: 13px;
  font-weight: 600;
  color: var(--ink-muted);
}

.launcher-body {
  padding: 20px;
}

.launcher-input-wrap {
  position: relative;
  margin-bottom: 16px;
}

.launcher-input {
  width: 100%;
  min-height: 72px;
  padding: 14px 16px;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-md);
  font-size: 14px;
  color: var(--ink);
  outline: none;
  transition: border-color var(--dur) var(--ease);
  cursor: text;
}

.launcher-input:focus {
  border-color: var(--brand-accent);
  box-shadow: 0 0 0 3px rgba(109, 93, 251, 0.1);
}

.launcher-counter {
  position: absolute;
  bottom: 8px;
  right: 12px;
  font-size: 11px;
  color: var(--ink-light);
}

.launcher-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 16px;
}

.chip {
  padding: 5px 12px;
  font-size: 12px;
  font-weight: 500;
  border-radius: var(--radius-pill);
  background: var(--surface-soft);
  color: var(--ink-muted);
  border: 1px solid var(--border);
  transition: all var(--dur) var(--ease);
}

.chip:hover {
  border-color: var(--brand-accent);
}

.chip.active {
  background: var(--brand-lavender);
  color: var(--brand-primary-dark);
  border-color: var(--brand-accent);
  font-weight: 600;
}

.launcher-send {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 12px 20px;
  background: var(--gradient-primary);
  color: white;
  font-weight: 600;
  font-size: 14px;
  border-radius: var(--radius-pill);
  box-shadow: 0 4px 16px rgba(109, 93, 251, 0.3);
  transition: all var(--dur) var(--ease);
}

.launcher-send:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(109, 93, 251, 0.4);
}

.launcher-send:active {
  transform: translateY(0);
}

.launcher-send:disabled {
  cursor: not-allowed;
  background: var(--border);
  box-shadow: none;
  color: var(--ink-muted);
  transform: none;
}

.launcher-send.sending {
  background: var(--brand-accent);
  pointer-events: none;
}

.launcher-send.sending #launcher-send-label {
  font-size: 0;
}

.launcher-send.sending #launcher-send-label::after {
  content: 'Launching…';
  font-size: 14px;
}

/* --- Orbiting Model Nodes --- */
.orbit-container {
  position: absolute;
  inset: 0;
  z-index: 1;
}

.orbit-lines {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.orbit-lines line {
  stroke: url(#orbit-gradient);
  stroke-width: 1.5;
  stroke-dasharray: 4 4;
  opacity: 0;
  transition: opacity var(--dur-slow) var(--ease);
}

.orbit-container.active .orbit-lines line {
  opacity: 0.5;
  animation: dash-flow 2s linear infinite;
}

@keyframes dash-flow {
  to { stroke-dashoffset: -16; }
}

.orbit-node {
  position: absolute;
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: white;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  border: 2px solid white;
  transition: transform var(--dur-slow) var(--ease-out), box-shadow var(--dur) var(--ease);
  z-index: 2;
}

.orbit-node img {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  object-fit: contain;
}

.orbit-node:hover {
  box-shadow: var(--shadow-lg);
  z-index: 4;
}

.orbit-node.inactive {
  filter: grayscale(1);
  opacity: 0.32;
  box-shadow: var(--shadow-xs);
}

/* Position 8 nodes around the circle */
.orbit-node-1 { top: 0%; left: 50%; transform: translate(-50%, 0); }
.orbit-node-2 { top: 15%; left: 85%; transform: translate(-50%, 0); }
.orbit-node-3 { top: 50%; left: 95%; transform: translate(-50%, -50%); }
.orbit-node-4 { top: 85%; left: 85%; transform: translate(-50%, -50%); }
.orbit-node-5 { top: 95%; left: 50%; transform: translate(-50%, -50%); }
.orbit-node-6 { top: 85%; left: 15%; transform: translate(-50%, -50%); }
.orbit-node-7 { top: 50%; left: 5%; transform: translate(-50%, -50%); }
.orbit-node-8 { top: 15%; left: 15%; transform: translate(-50%, 0); }

.orbit-node-1:hover { transform: translate(-50%, 0) scale(1.12); }
.orbit-node-2:hover { transform: translate(-50%, 0) scale(1.12); }
.orbit-node-3:hover { transform: translate(-50%, -50%) scale(1.12); }
.orbit-node-4:hover { transform: translate(-50%, -50%) scale(1.12); }
.orbit-node-5:hover { transform: translate(-50%, -50%) scale(1.12); }
.orbit-node-6:hover { transform: translate(-50%, -50%) scale(1.12); }
.orbit-node-7:hover { transform: translate(-50%, -50%) scale(1.12); }
.orbit-node-8:hover { transform: translate(-50%, 0) scale(1.12); }

/* Pulse animation when sending */
.orbit-node.pulse {
  animation: node-pulse 0.6s var(--ease-out);
}

@keyframes node-pulse {
  0% { transform: translate(-50%, -50%) scale(1); box-shadow: var(--shadow-md); }
  50% { transform: translate(-50%, -50%) scale(1.2); box-shadow: 0 0 30px rgba(109, 93, 251, 0.5), var(--shadow-lg); }
  100% { transform: translate(-50%, -50%) scale(1); box-shadow: var(--shadow-md); }
}

.orbit-node-1.pulse { animation: node-pulse-1 0.6s var(--ease-out); }
.orbit-node-2.pulse { animation: node-pulse-2 0.6s var(--ease-out); }
.orbit-node-8.pulse { animation: node-pulse-8 0.6s var(--ease-out); }

@keyframes node-pulse-1 {
  0%, 100% { transform: translate(-50%, 0) scale(1); }
  50% { transform: translate(-50%, 0) scale(1.2); box-shadow: 0 0 30px rgba(109, 93, 251, 0.5); }
}
@keyframes node-pulse-2 {
  0%, 100% { transform: translate(-50%, 0) scale(1); }
  50% { transform: translate(-50%, 0) scale(1.2); box-shadow: 0 0 30px rgba(109, 93, 251, 0.5); }
}
@keyframes node-pulse-8 {
  0%, 100% { transform: translate(-50%, 0) scale(1); }
  50% { transform: translate(-50%, 0) scale(1.2); box-shadow: 0 0 30px rgba(109, 93, 251, 0.5); }
}

/* --- Trust Bar --- */
.trust-bar {
  padding: 32px 0;
  background: var(--surface);
  border-bottom: 1px solid var(--border-soft);
}

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

.trust-items {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
}

.trust-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--ink-soft);
}

.trust-item svg {
  color: var(--brand-primary);
}

.github-stats {
  display: flex;
  align-items: center;
  gap: 16px;
}

.github-stat-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-pill);
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  transition: all var(--dur) var(--ease);
  box-shadow: var(--shadow-xs);
}

.github-stat-link:hover {
  border-color: var(--brand-accent);
  background: var(--brand-mist);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.github-stat-link svg {
  color: var(--ink);
}

.github-stat-label {
  min-width: 60px;
}

.github-stat-loading {
  display: inline-block;
  width: 14px;
  height: 14px;
  border: 2px solid var(--border);
  border-top-color: var(--brand-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.github-stat-count {
  font-weight: 700;
  color: var(--brand-primary);
}

/* --- Features --- */
.features {
  background: var(--gradient-soft);
}

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

.feature-card {
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: var(--radius-xl);
  padding: 32px 28px;
  box-shadow: var(--shadow-sm);
  transition: all var(--dur) var(--ease);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(139, 124, 255, 0.3);
}

.feature-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--gradient-primary);
  color: white;
  margin-bottom: 20px;
  box-shadow: 0 4px 12px rgba(109, 93, 251, 0.25);
}

.feature-card h3 {
  font-size: 19px;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--ink);
}

.feature-card p {
  font-size: 15px;
  color: var(--ink-soft);
  margin-bottom: 8px;
  line-height: 1.6;
}

.feature-zh {
  font-size: 13px;
  color: var(--ink-muted);
  margin-top: 8px;
}

/* --- How It Works --- */
.how-it-works {
  background: var(--surface);
}

.steps {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 0;
  margin-bottom: 64px;
  flex-wrap: wrap;
}

.step {
  flex: 1;
  min-width: 240px;
  max-width: 320px;
  text-align: center;
  padding: 0 24px;
  border-radius: var(--radius-lg);
  transition: background var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.step:hover,
.step:focus-visible,
.step.is-active {
  background: var(--surface-soft);
  transform: translateY(-4px);
  box-shadow: 0 0 0 3px rgba(109, 93, 251, 0.18);
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--gradient-primary);
  color: white;
  font-size: 22px;
  font-weight: 800;
  margin-bottom: 20px;
  box-shadow: 0 4px 16px rgba(109, 93, 251, 0.3);
}

.step-content h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--ink);
}

.step-content p {
  font-size: 15px;
  color: var(--ink-soft);
  margin-bottom: 4px;
}

.step-zh {
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  margin-top: 12px;
}

.step-zh-desc {
  font-size: 13px;
  color: var(--ink-muted);
}

.step-connector {
  flex: 0 0 60px;
  height: 2px;
  background: linear-gradient(90deg, var(--brand-accent), var(--brand-secondary));
  margin-top: 28px;
  opacity: 0.4;
  border-radius: 2px;
}

/* --- Popup Mockup --- */
.popup-mockup {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  max-width: 420px;
  margin: 0 auto;
}

.mockup-window {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  overflow: hidden;
}

.mockup-titlebar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: var(--surface-soft);
  border-bottom: 1px solid var(--border-soft);
}

.mockup-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.mockup-dot:nth-child(1) { background: #FF5F57; }
.mockup-dot:nth-child(2) { background: #FEBC2E; }
.mockup-dot:nth-child(3) { background: #28C840; }

.mockup-tab-label {
  margin-left: auto;
  font-size: 12px;
  font-weight: 600;
  color: var(--ink-muted);
}

.mockup-body {
  padding: 20px;
}

.mockup-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.mockup-brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.mockup-logo {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  background: var(--gradient-primary);
  box-shadow: 0 4px 12px rgba(109, 93, 251, 0.3);
}

.mockup-brand strong {
  display: block;
  font-size: 14px;
  color: var(--ink);
}

.mockup-brand small {
  font-size: 11px;
  color: var(--ink-muted);
}

.mockup-gear {
  font-size: 18px;
  color: var(--ink-light);
}

.mockup-input {
  width: 100%;
  padding: 14px 16px;
  background: var(--surface-soft);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-md);
  font-size: 14px;
  color: var(--ink);
  margin-bottom: 14px;
}

.mockup-input.is-highlighted,
.mockup-models.is-highlighted,
.mockup-send.is-highlighted {
  box-shadow: 0 0 0 3px rgba(109, 93, 251, 0.18), var(--shadow-sm);
}

.mockup-models {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 14px;
}

.mockup-model-chip {
  padding: 4px 10px;
  font-size: 12px;
  font-weight: 500;
  border-radius: var(--radius-pill);
  background: var(--surface-soft);
  color: var(--ink-muted);
  border: 1px solid var(--border);
}

.mockup-model-chip.selected {
  background: var(--brand-lavender);
  color: var(--brand-primary-dark);
  border-color: var(--brand-accent);
}

.mockup-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 0;
  margin-bottom: 14px;
  font-size: 13px;
  color: var(--ink-soft);
}

.mockup-switch {
  width: 36px;
  height: 20px;
  border-radius: var(--radius-pill);
  background: var(--brand-primary);
  position: relative;
}

.mockup-switch::after {
  content: '';
  position: absolute;
  top: 2px;
  right: 2px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: white;
  box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

.mockup-send {
  display: block;
  width: 100%;
  padding: 12px;
  background: var(--gradient-primary);
  color: white;
  font-weight: 600;
  font-size: 14px;
  border-radius: var(--radius-pill);
  box-shadow: 0 4px 12px rgba(109, 93, 251, 0.3);
}

.mockup-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
}

.mockup-tab-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  font-size: 12px;
  font-weight: 500;
  color: var(--ink-soft);
  box-shadow: var(--shadow-xs);
}

.mockup-tab-color {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

/* --- Models Grid --- */
.models {
  background: var(--gradient-soft);
}

.models-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.model-card {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 32px 20px;
  text-align: center;
  box-shadow: var(--shadow-xs);
  transition: all var(--dur) var(--ease);
}

.model-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(139, 124, 255, 0.3);
}

.model-card img {
  width: 64px;
  height: 64px;
  margin: 0 auto 16px;
  border-radius: var(--radius-md);
  object-fit: contain;
}

.model-card h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 4px;
  color: var(--ink);
}

.model-card p {
  font-size: 13px;
  color: var(--ink-muted);
}

/* --- Use Cases --- */
.use-cases {
  background: var(--surface);
}

.usecases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
}

.usecase-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 32px 28px;
  box-shadow: var(--shadow-xs);
  transition: all var(--dur) var(--ease);
}

.usecase-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(85, 184, 255, 0.3);
}

.usecase-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--brand-lavender);
  color: var(--brand-primary);
  margin-bottom: 16px;
}

.usecase-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--ink);
}

.usecase-card p {
  font-size: 14px;
  color: var(--ink-soft);
  margin-bottom: 4px;
}

.usecase-zh {
  font-size: 13px;
  color: var(--ink-muted);
  margin-top: 8px;
}

/* --- Privacy --- */
.privacy {
  background: var(--gradient-soft);
}

.privacy-card {
  max-width: 720px;
  margin: 0 auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 48px 40px;
  text-align: center;
  box-shadow: var(--shadow-md);
}

.privacy-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  border-radius: var(--radius-lg);
  background: var(--gradient-primary);
  color: white;
  margin-bottom: 24px;
  box-shadow: 0 8px 24px rgba(109, 93, 251, 0.25);
}

.privacy-card h2 {
  font-size: 28px;
  font-weight: 800;
  margin-bottom: 8px;
  color: var(--ink);
}

.privacy-subtitle-zh {
  font-size: 16px;
  color: var(--ink-muted);
  margin-bottom: 28px;
}

.privacy-list {
  text-align: left;
  margin-bottom: 28px;
}

.privacy-list li {
  padding: 14px 0;
  border-bottom: 1px solid var(--border-soft);
}

.privacy-list li:last-child {
  border-bottom: none;
}

.privacy-list p {
  font-size: 15px;
  color: var(--ink-soft);
}

.privacy-zh {
  font-size: 13px;
  color: var(--ink-muted);
  margin-top: 4px;
}

.privacy-link {
  margin-top: 8px;
}

/* --- Final CTA --- */
.final-cta {
  position: relative;
  padding: 96px 0;
  overflow: hidden;
}

.cta-bg {
  position: absolute;
  inset: 0;
  background: var(--gradient-cta);
  z-index: 0;
}

.cta-bg::before {
  content: '';
  position: absolute;
  top: -50%;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(139, 124, 255, 0.15), transparent 70%);
  border-radius: 50%;
}

.cta-container {
  position: relative;
  z-index: 1;
  text-align: center;
}

.cta-container h2 {
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
  color: var(--ink);
}

.cta-subtitle-zh {
  font-size: 20px;
  color: var(--ink-soft);
  margin-bottom: 32px;
}

/* --- Footer --- */
.site-footer {
  padding: 40px 0;
  background: var(--surface);
  border-top: 1px solid var(--border-soft);
}

.footer-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  text-align: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 18px;
  color: var(--ink);
}

.footer-logo {
  border-radius: var(--radius-sm);
}

.footer-tagline {
  font-size: 14px;
  color: var(--ink-muted);
  font-style: italic;
}

.footer-links {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  justify-content: center;
}

.footer-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--ink-soft);
  transition: color var(--dur) var(--ease);
}

.footer-links a:hover {
  color: var(--brand-primary);
}

/* --- Scroll Reveal Animation --- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Responsive: Tablet (768px) --- */
@media (max-width: 968px) {
  .hero-container {
    grid-template-columns: 1fr;
    gap: 64px;
    text-align: center;
  }

  .hero-content {
    max-width: 100%;
    margin: 0 auto;
  }

  .hero-cta {
    justify-content: center;
  }

  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .models-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .usecases-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .steps {
    flex-direction: column;
    align-items: center;
    gap: 32px;
  }

  .step-connector {
    width: 2px;
    height: 40px;
    flex: none;
    margin: 0;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    padding: 20px var(--container-pad);
    gap: 16px;
    transform: translateY(-120%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--dur) var(--ease);
  }

  .nav-menu.open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-menu a {
    font-size: 16px;
    padding: 8px 0;
  }

  .nav-menu .nav-download {
    display: inline-flex;
    width: 100%;
    margin-top: 4px;
  }

  .menu-toggle {
    display: flex;
  }

  .nav-cta {
    display: none;
  }

  .section {
    padding: 64px 0;
  }

  .section-header {
    margin-bottom: 40px;
  }

  .hero {
    padding: 100px 0 60px;
  }

  .hero-visual {
    max-width: 420px;
    aspect-ratio: 4 / 3;
  }

  .trust-container {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .trust-items {
    justify-content: center;
    gap: 20px;
  }

  .launcher-card {
    width: 280px;
  }

  .orbit-node {
    width: 48px;
    height: 48px;
  }

  .orbit-node img {
    width: 30px;
    height: 30px;
  }
}

/* --- Responsive: Mobile (375px) --- */
@media (max-width: 480px) {
  :root {
    --container-pad: 16px;
  }

  .hero-content h1 {
    font-size: 32px;
  }

  .hero-subtitle-zh {
    font-size: 18px;
  }

  .hero-description {
    font-size: 15px;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .models-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .model-card {
    padding: 24px 16px;
  }

  .model-card img {
    width: 48px;
    height: 48px;
  }

  .usecases-grid {
    grid-template-columns: 1fr;
  }

  .privacy-card {
    padding: 32px 24px;
  }

  .step {
    padding: 0 8px;
    min-width: 0;
  }

  .launcher-card {
    width: 260px;
  }

  .btn {
    padding: 10px 20px;
    font-size: 14px;
  }

  .hero-cta {
    flex-direction: column;
    width: 100%;
  }

  .hero-cta .btn {
    width: 100%;
  }

  .hero-visual {
    aspect-ratio: auto;
    height: 310px;
  }

  .orbit-container {
    opacity: 0.55;
    transform: scale(0.82);
  }

  .final-cta {
    padding: 64px 0;
  }

  .final-cta .btn-large {
    width: min(100%, 360px);
    white-space: normal;
  }

  .footer-links {
    gap: 16px;
  }
}

/* --- Reduced Motion --- */
@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;
  }

  .orbit-container.active .orbit-lines line {
    animation: none;
    opacity: 0.5;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}