:root {
  --bg: #0A0B1A;
  --bg-elevated: #0F1221;
  --bg-radial: radial-gradient(ellipse 160% 80% at 50% -10%, rgba(124,58,237,0.28) 0%, rgba(236,72,153,0.12) 30%, rgba(6,182,212,0.05) 55%, transparent 70%), radial-gradient(circle at 80% 50%, rgba(124,58,237,0.10), transparent 40%), #0A0B1A;
  --surface: rgba(255, 255, 255, 0.05);
  --surface-hover: rgba(255, 255, 255, 0.09);
  --text-primary: #F8FAFC;
  --text-secondary: rgba(248, 250, 252, 0.68);
  --text-tertiary: rgba(248, 250, 252, 0.42);
  --hairline: rgba(255, 255, 255, 0.10);
  --hairline-strong: rgba(255, 255, 255, 0.18);
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.35);
  --glow-violet: rgba(124, 58, 237, 0.45);
  --glow-pink: rgba(236, 72, 153, 0.35);
  --glow-cyan: rgba(6, 182, 212, 0.35);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.6;
}

/* 渐变背景固定在一个独立合成层上，滚动时不再整页重绘 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background: var(--bg-radial);
}

.mono {
  font-family: "JetBrains Mono", "SF Mono", Consolas, monospace;
}

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

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

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

ul, ol {
  list-style: none;
}

.container {
  width: min(1120px, calc(100% - 48px));
  margin: 0 auto;
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--hairline);
  color: var(--text-secondary);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.02em;
  font-family: "JetBrains Mono", monospace;
  text-transform: uppercase;
}

.gradient-text {
  background: linear-gradient(135deg, #7C3AED 0%, #EC4899 55%, #06B6D4 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 14px;
  font-weight: 600;
  font-size: 15px;
  transition: transform 200ms ease-out, opacity 200ms ease-out, box-shadow 200ms ease-out;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: linear-gradient(135deg, #7C3AED 0%, #EC4899 100%);
  color: #fff;
  box-shadow: 0 12px 32px rgba(124, 58, 237, 0.30);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 18px 42px rgba(124, 58, 237, 0.40);
}

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

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

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 700ms cubic-bezier(0.16, 1, 0.3, 1), transform 700ms cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.in-view {
  opacity: 1;
  transform: translateY(0);
}

/* Intro */
.intro-screen {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-radial);
  pointer-events: none;
  opacity: 1;
  transition: opacity 600ms ease-out, visibility 600ms ease-out;
}

.intro-screen.is-hidden {
  opacity: 0;
  visibility: hidden;
}

.intro-text {
  font-size: clamp(28px, 6vw, 64px);
  font-weight: 700;
  letter-spacing: -0.03em;
  text-align: center;
  background: linear-gradient(135deg, #7C3AED 0%, #EC4899 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 900ms ease-out, transform 900ms ease-out;
}

.intro-text.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Navigation */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  padding: 16px 0;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--hairline);
  backdrop-filter: blur(20px) saturate(140%);
  box-shadow: var(--shadow);
}

.nav-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.02em;
}

.nav-disclaimer {
  display: inline-flex;
  align-items: center;
  padding: 5px 12px;
  border-radius: 999px;
  background: rgba(124, 58, 237, 0.12);
  border: 1px solid rgba(124, 58, 237, 0.22);
  color: rgba(248, 250, 252, 0.78);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.01em;
  line-height: 1.4;
  max-width: 220px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-links a {
  padding: 8px 14px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color 200ms, background 200ms;
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.icon-btn {
  width: 40px;
  height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  background: var(--surface);
  border: 1px solid var(--hairline);
  color: var(--text-primary);
  transition: background 200ms, transform 150ms;
}

.icon-btn:hover {
  background: var(--surface-hover);
  transform: translateY(-1px);
}

.icon-btn svg {
  width: 20px;
  height: 20px;
  stroke-width: 2;
}

.menu-toggle {
  display: none;
}

/* Hero */
.hero {
  padding: 160px 0 90px;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
  gap: 56px;
}

.hero-content > * {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 800ms cubic-bezier(0.16, 1, 0.3, 1), transform 800ms cubic-bezier(0.16, 1, 0.3, 1);
}

body.ready .hero-content > * {
  opacity: 1;
  transform: translateY(0);
}

body.ready .hero-content > *:nth-child(1) { transition-delay: 0ms; }
body.ready .hero-content > *:nth-child(2) { transition-delay: 90ms; }
body.ready .hero-content > *:nth-child(3) { transition-delay: 180ms; }
body.ready .hero-content > *:nth-child(4) { transition-delay: 270ms; }
body.ready .hero-content > *:nth-child(5) { transition-delay: 360ms; }

.hero-title {
  font-size: clamp(64px, 11vw, 120px);
  font-weight: 800;
  letter-spacing: -0.05em;
  line-height: 0.95;
  margin: 18px 0 22px;
}

.page-hero-title {
  font-size: clamp(42px, 7vw, 80px);
  line-height: 1.05;
}

.page-hero-grid {
  grid-template-columns: 1fr;
  text-align: center;
  justify-items: center;
}

.page-hero-grid .hero-content {
  max-width: 760px;
}

.page2-hero {
  padding-bottom: 30px;
}

.page2-features {
  padding-top: 30px;
}

.app-title-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  flex-wrap: wrap;
  margin: 18px 0 0;
}

.app-title-icon {
  width: 64px;
  height: 64px;
  border-radius: 18px;
  box-shadow: 0 18px 50px rgba(124, 58, 237, 0.28);
  object-fit: cover;
}

.app-title-name {
  font-size: clamp(32px, 7vw, 56px);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.05;
  margin: 0;
}

.app-hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-top: 28px;
  flex-wrap: wrap;
}

.liquid-glass-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 22px;
  border-radius: 20px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--hairline);
  box-shadow: var(--shadow);
  backdrop-filter: blur(20px) saturate(140%);
  -webkit-backdrop-filter: blur(20px) saturate(140%);
  cursor: pointer;
  transition: transform 200ms, background 200ms, border-color 200ms, box-shadow 200ms;
}

.liquid-glass-btn:hover {
  background: rgba(255, 255, 255, 0.10);
  border-color: var(--hairline-strong);
  transform: translateY(-2px);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.40);
}

.liquid-glass-btn:active {
  transform: scale(0.97);
}

.liquid-glass-btn-primary {
  background: linear-gradient(135deg, rgba(124, 58, 237, 0.20), rgba(236, 72, 153, 0.16));
}

.liquid-glass-btn-primary:hover {
  background: linear-gradient(135deg, rgba(124, 58, 237, 0.28), rgba(236, 72, 153, 0.22));
}

.liquid-glass-btn svg {
  width: 18px;
  height: 18px;
}

.details-modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 300ms ease-out, visibility 300ms ease-out;
}

.details-modal.open {
  opacity: 1;
  visibility: visible;
}

.details-modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(10, 11, 26, 0.75);
  backdrop-filter: blur(4px);
  cursor: pointer;
}

.details-modal-panel {
  position: relative;
  width: 100%;
  max-width: 760px;
  max-height: 86vh;
  overflow-y: auto;
  padding: 36px;
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--hairline);
  box-shadow: var(--shadow);
  backdrop-filter: blur(20px) saturate(140%);
  -webkit-backdrop-filter: blur(20px) saturate(140%);
  transform: scale(0.96) translateY(10px);
  transition: transform 300ms cubic-bezier(0.16, 1, 0.3, 1);
}

.details-modal.open .details-modal-panel {
  transform: scale(1) translateY(0);
}

.details-modal-close {
  position: absolute;
  top: 18px;
  right: 18px;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: color 200ms, background 200ms, border-color 200ms, transform 200ms;
}

.details-modal-close:hover {
  color: var(--text-primary);
  background: var(--surface);
  border-color: var(--hairline);
  transform: rotate(90deg);
}

.details-modal-close svg {
  width: 20px;
  height: 20px;
}

.details-modal-header {
  text-align: center;
  margin-bottom: 28px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--hairline);
}

.details-modal-title {
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0 0 8px;
}

.details-modal-subtitle {
  font-size: 14px;
  color: var(--text-secondary);
  margin: 0;
}

.details-modal-body p {
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.85;
  margin-bottom: 18px;
}

.details-modal-body p:last-child {
  margin-bottom: 0;
}

.details-modal-body strong {
  color: var(--text-primary);
  font-weight: 650;
}

@media (max-width: 768px) {
  .app-hero-actions {
    margin-top: 22px;
    gap: 12px;
  }
  .liquid-glass-btn {
    padding: 11px 20px;
    font-size: 14px;
    border-radius: 18px;
  }
  .details-modal {
    padding: 16px;
  }
  .details-modal-panel {
    padding: 26px 22px;
    border-radius: 20px;
  }
  .details-modal-title {
    font-size: 22px;
  }
  .details-modal-body p {
    font-size: 14px;
  }
}

/* Profile page */
.profile-hero {
  padding: 150px 0 40px;
}

.profile-card {
  position: relative;
  border-radius: 28px;
  overflow: hidden;
  background: var(--surface);
  border: 1px solid var(--hairline);
  box-shadow: var(--shadow);
}

.profile-cover {
  position: relative;
  width: 100%;
  height: 260px;
  overflow: hidden;
}

.profile-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.profile-cover::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, rgba(10,11,26,0.25) 0%, rgba(10,11,26,0.65) 100%);
}

.profile-content {
  position: relative;
  display: flex;
  align-items: flex-end;
  gap: 24px;
  padding: 0 40px 40px;
  margin-top: -60px;
}

.profile-avatar-wrap {
  position: relative;
  flex-shrink: 0;
  width: 120px;
  height: 120px;
  border-radius: 50%;
  padding: 4px;
  background: linear-gradient(135deg, #7C3AED, #EC4899);
  box-shadow: 0 16px 50px rgba(0, 0, 0, 0.35);
}

.profile-avatar {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--bg);
  background: var(--bg-elevated);
}

.profile-info {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-bottom: 6px;
}

.profile-name {
  font-size: clamp(32px, 6vw, 56px);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.05;
  margin: 0;
}

.profile-alias {
  font-size: 0.55em;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: 0;
}

.profile-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  align-self: flex-start;
  padding: 8px 16px;
  border-radius: 999px;
  background: rgba(124, 58, 237, 0.12);
  border: 1px solid rgba(124, 58, 237, 0.25);
  color: rgba(248, 250, 252, 0.9);
  font-size: 14px;
  font-weight: 600;
}

.profile-tag svg {
  width: 16px;
  height: 16px;
  color: #A78BFA;
}

.quote-section {
  padding: 40px 0 100px;
}

.quote-card {
  text-align: center;
  padding: 40px;
  border-radius: 28px;
  background: var(--surface);
  border: 1px solid var(--hairline);
  font-size: clamp(18px, 2.4vw, 24px);
  line-height: 1.65;
  font-weight: 500;
  color: var(--text-secondary);
  box-shadow: var(--shadow);
}

@media (max-width: 768px) {
  .profile-hero {
    padding-top: 120px;
  }
  .profile-cover {
    height: 200px;
  }
  .profile-content {
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 0 24px 32px;
    margin-top: -50px;
    gap: 18px;
  }
  .profile-avatar-wrap {
    width: 100px;
    height: 100px;
  }
  .profile-tag {
    align-self: center;
  }
  .quote-card {
    padding: 28px 24px;
  }
}

.screenshot-marquee {
  padding: 40px 0 80px;
  overflow: hidden;
}

.marquee-track {
  display: flex;
  width: max-content;
  animation: marquee 45s linear infinite;
  animation-play-state: running !important;
}

.marquee-group {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 0 9px;
}

.marquee-group img {
  height: 620px;
  width: auto;
  border-radius: 24px;
  box-shadow: 0 22px 60px rgba(0, 0, 0, 0.40);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--hairline);
  object-fit: cover;
  cursor: zoom-in;
  image-rendering: -webkit-optimize-contrast;
  image-rendering: crisp-edges;
  transition: transform 250ms cubic-bezier(0.16, 1, 0.3, 1), box-shadow 250ms, opacity 250ms;
  will-change: transform;
}

.marquee-group img:hover {
  opacity: 1 !important;
  transform: scale(1.045);
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.55), 0 0 0 1px rgba(124, 58, 237, 0.35);
  z-index: 2;
}

@keyframes marquee {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

@media (max-width: 768px) {
  .marquee-group img {
    height: 460px;
  }

  .app-title-row {
    gap: 14px;
  }

  .app-title-icon {
    width: 52px;
    height: 52px;
    border-radius: 14px;
  }
}

.hero-subtitle {
  font-size: clamp(18px, 2.2vw, 22px);
  color: var(--text-secondary);
  max-width: 480px;
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 38px;
}

/* Mockup */
.mockup-stage {
  perspective: 1200px;
  opacity: 0;
  transform: translateY(40px) rotateY(-8deg);
  transition: opacity 900ms cubic-bezier(0.16, 1, 0.3, 1) 420ms, transform 900ms cubic-bezier(0.16, 1, 0.3, 1) 420ms;
}

body.ready .mockup-stage {
  opacity: 1;
  transform: translateY(0) rotateY(0);
}

.mockup-card {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 10.5;
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--hairline);
  box-shadow: 0 40px 100px rgba(0, 0, 0, 0.45), inset 0 1px 0 rgba(255,255,255,0.08);
  will-change: transform;
  transform-style: preserve-3d;
  transform: rotateX(18deg) rotateY(-14deg) rotateZ(0deg);
  animation: mockupFloat 6s ease-in-out infinite;
}

.mockup-card::before {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: 25px;
  padding: 1px;
  background: linear-gradient(135deg, rgba(124,58,237,0.6), rgba(236,72,153,0.35), rgba(6,182,212,0.25));
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}

.mockup-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 18px 22px;
  border-bottom: 1px solid var(--hairline);
}

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

.dot:first-child { background: #EC4899; }
.dot:nth-child(2) { background: #7C3AED; }
.dot:nth-child(3) { background: #06B6D4; }

.mockup-body {
  padding: 28px;
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 24px;
  height: calc(100% - 60px);
}

.mockup-left {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.mockup-kicker {
  font-family: "JetBrains Mono", monospace;
  font-size: 11px;
  color: var(--text-tertiary);
  letter-spacing: 0.08em;
}

.mockup-headline {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
}

.code-stack {
  margin-top: 14px;
  display: flex;
  flex-direction: column;
  gap: 3px;
  font-size: 11px;
  line-height: 1.45;
  color: var(--text-secondary);
  opacity: 0.85;
}

.code-line {
  white-space: nowrap;
}

.code-indent {
  padding-left: 12px;
}

.code-violet { color: #A78BFA; }
.code-pink { color: #F472B6; }
.code-cyan { color: #22D3EE; }

.mockup-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: auto;
}

.avatar-group {
  display: flex;
}

.avatar-group img {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 2px solid var(--bg-elevated);
  margin-left: -10px;
  object-fit: cover;
}

.avatar-group img:first-child {
  margin-left: 0;
}

.mockup-right {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.metric {
  flex: 1;
  border-radius: 16px;
  background: var(--surface);
  border: 1px solid var(--hairline);
  padding: 16px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.metric-label {
  font-size: 12px;
  color: var(--text-secondary);
}

.metric-value {
  font-size: 26px;
  font-weight: 700;
}

.metric-code {
  display: inline-block;
  margin-left: 6px;
  font-size: 11px;
  color: var(--text-tertiary);
  vertical-align: middle;
}

.metric-cursor {
  display: inline-block;
  width: 2px;
  height: 0.9em;
  background: #EC4899;
  margin-left: 4px;
  vertical-align: baseline;
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

.metric-bar {
  height: 6px;
  border-radius: 999px;
  background: var(--hairline);
  overflow: hidden;
  margin-top: 10px;
}

.metric-fill {
  height: 100%;
  width: 78%;
  border-radius: 999px;
  background: linear-gradient(90deg, #7C3AED, #EC4899);
}

/* Features */
.features {
  padding: 100px 0;
}

.section-head {
  text-align: center;
  max-width: 620px;
  margin: 0 auto 64px;
}

.section-title {
  font-size: clamp(34px, 5vw, 52px);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.1;
  margin: 18px 0 14px;
}

.section-desc {
  color: var(--text-secondary);
  font-size: 18px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.feature-card {
  padding: 28px;
  border-radius: 22px;
  background: var(--surface);
  border: 1px solid var(--hairline);
  transition: transform 300ms cubic-bezier(0.16, 1, 0.3, 1), background 200ms, border-color 200ms, box-shadow 300ms;
}

.feature-card:hover {
  transform: translateY(-8px);
  background: var(--surface-hover);
  border-color: var(--hairline-strong);
  box-shadow: 0 28px 60px rgba(0, 0, 0, 0.25);
}

.feature-card.dev-card {
  cursor: pointer;
}

.feature-card.dev-card:active {
  transform: translateY(-4px) scale(0.99);
}

.feature-icon {
  width: 46px;
  height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 14px;
  margin-bottom: 20px;
  background: rgba(124, 58, 237, 0.12);
  color: #A78BFA;
}

.feature-card:nth-child(3n+2) .feature-icon {
  background: rgba(236, 72, 153, 0.12);
  color: #F472B6;
}

.feature-card:nth-child(3n+3) .feature-icon {
  background: rgba(6, 182, 212, 0.12);
  color: #22D3EE;
}

.feature-icon svg {
  width: 24px;
  height: 24px;
  stroke-width: 1.8;
}

.feature-icon img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 12px;
}

.feature-title {
  font-size: 17px;
  font-weight: 650;
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}

.feature-text {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* feature-card-link：让整张 feature-card 可点击跳转 */
.feature-card-link {
  display: contents;
  color: inherit;
  text-decoration: none;
}

.feature-card-link:hover .feature-card {
  border-color: rgba(124, 58, 237, 0.4);
  transform: translateY(-3px);
}

.feature-card-link:active .feature-card {
  transform: translateY(-1px);
}

.dev-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-top: 14px;
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  background: linear-gradient(90deg, #4ADE80, #38BDF8);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  transition: opacity 200ms, transform 200ms;
}

.dev-link:hover {
  opacity: 0.85;
}

.dev-link span {
  transition: transform 200ms;
}

.dev-link:hover span {
  transform: translateX(3px);
}

/* Testimonials */
.testimonials {
  padding: 100px 0;
  overflow: hidden;
}

.carousel-wrap {
  position: relative;
  margin-top: 60px;
}

.carousel-viewport {
  overflow: hidden;
  border-radius: 28px;
}

.carousel-track {
  display: flex;
  transition: transform 500ms cubic-bezier(0.16, 1, 0.3, 1);
  cursor: grab;
}

.carousel-track.is-dragging {
  cursor: grabbing;
  transition: none;
}

.testimonial-card {
  flex: 0 0 100%;
  padding: 44px;
  border-radius: 28px;
  background: var(--surface);
  border: 1px solid var(--hairline);
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 32px;
  align-items: center;
  user-select: none;
}

.testimonial-avatar {
  width: 160px;
  height: 160px;
  border-radius: 24px;
  object-fit: cover;
  border: 1px solid var(--hairline);
  box-shadow: 0 20px 50px rgba(0,0,0,0.25);
}

.testimonial-quote {
  font-size: clamp(20px, 2.4vw, 26px);
  line-height: 1.55;
  font-weight: 500;
  letter-spacing: -0.01em;
  margin-bottom: 26px;
}

.testimonial-stars {
  display: flex;
  gap: 4px;
  margin-bottom: 18px;
  color: #FBBF24;
}

.testimonial-stars svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
  stroke: currentColor;
  stroke-width: 1.5;
}

.testimonial-name {
  font-weight: 700;
  font-size: 16px;
  margin-bottom: 2px;
}

.testimonial-role {
  font-size: 14px;
  color: var(--text-secondary);
}

.carousel-dots {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-top: 28px;
}

.carousel-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--hairline-strong);
  transition: transform 200ms, background 200ms;
}

.carousel-dot.active {
  background: linear-gradient(135deg, #7C3AED, #EC4899);
  transform: scale(1.2);
}

/* Footer */
.footer {
  padding: 80px 0 40px;
  border-top: 1px solid var(--hairline);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 48px;
  align-items: start;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 20px;
  margin-bottom: 14px;
}

.footer-copy {
  color: var(--text-secondary);
  font-size: 15px;
  max-width: 340px;
  line-height: 1.65;
}

.subscribe {
  border-radius: 22px;
  background: var(--surface);
  border: 1px solid var(--hairline);
  padding: 28px;
}

.subscribe-title {
  font-size: 17px;
  font-weight: 650;
  margin-bottom: 6px;
}

.subscribe-desc {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 18px;
}

.subscribe-form {
  display: flex;
  gap: 10px;
}

.subscribe-input {
  flex: 1;
  min-width: 0;
  padding: 12px 16px;
  border-radius: 12px;
  border: 1px solid var(--hairline);
  background: var(--bg-elevated);
  color: var(--text-primary);
  font-size: 14px;
  outline: none;
  transition: border-color 200ms, box-shadow 200ms;
}

.subscribe-input:focus {
  border-color: #7C3AED;
  box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.15);
}

.subscribe-input::placeholder {
  color: var(--text-tertiary);
}

.subscribe-btn {
  padding: 12px 22px;
  border-radius: 12px;
  background: linear-gradient(135deg, #7C3AED, #EC4899);
  color: #fff;
  font-weight: 600;
  font-size: 14px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: opacity 200ms, transform 150ms;
}

.subscribe-btn:hover {
  transform: translateY(-1px);
}

.subscribe-btn:disabled {
  opacity: 0.65;
  cursor: not-allowed;
}

.spinner {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255,255,255,0.35);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 700ms linear infinite;
}

.footer-legal {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--hairline);
  display: flex;
  justify-content: space-between;
  color: var(--text-tertiary);
  font-size: 13px;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  opacity: 0;
  z-index: 90;
  pointer-events: none;
  transition: opacity 300ms ease-out, transform 300ms ease-out;
}

.toast.visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.toast-inner {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 22px;
  border-radius: 999px;
  background: rgba(10, 11, 26, 0.92);
  border: 1px solid rgba(255,255,255,0.12);
  color: #fff;
  font-size: 14px;
  font-weight: 500;
  box-shadow: 0 16px 40px rgba(0,0,0,0.30);
  backdrop-filter: blur(12px);
}

.toast-inner svg {
  width: 18px;
  height: 18px;
  color: #22D3EE;
}

/* Lightbox */
.lightbox-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(10, 11, 26, 0.92);
  backdrop-filter: blur(14px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 300ms ease-out, visibility 300ms ease-out;
}

.lightbox-overlay.open {
  opacity: 1;
  visibility: visible;
}

.lightbox-img {
  max-height: 86vh;
  max-width: 100%;
  width: auto;
  height: auto;
  border-radius: 22px;
  box-shadow: 0 40px 100px rgba(0, 0, 0, 0.55);
  border: 1px solid var(--hairline);
  transform: scale(0.94);
  transition: transform 300ms cubic-bezier(0.16, 1, 0.3, 1);
}

.lightbox-overlay.open .lightbox-img {
  transform: scale(1);
}

.lightbox-close {
  position: absolute;
  top: 22px;
  right: 22px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--hairline);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background 200ms, transform 150ms;
}

.lightbox-close:hover {
  background: rgba(255, 255, 255, 0.14);
  transform: rotate(90deg);
}

.lightbox-close svg {
  width: 22px;
  height: 22px;
}

@media (max-width: 768px) {
  .lightbox-overlay {
    padding: 16px;
  }
  .lightbox-img {
    max-height: 78vh;
    border-radius: 16px;
  }
}

/* Animations */
@keyframes mockupFloat {
  0%, 100% { transform: rotateX(18deg) rotateY(-14deg) translateY(0); }
  50% { transform: rotateX(18deg) rotateY(-14deg) translateY(-12px); }
}

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

/* 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;
  }
  .intro-screen {
    display: none;
  }
  .reveal,
  .hero-content > *,
  .mockup-stage {
    opacity: 1;
    transform: none;
  }
}

/* Responsive */
@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 52px;
  }
  .mockup-card {
    transform: rotateX(12deg) rotateY(-8deg);
  }
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .testimonial-card {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 24px;
  }
  .testimonial-avatar {
    margin: 0 auto;
  }
  .testimonial-stars {
    justify-content: center;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .nav-links, .nav-actions .btn {
    display: none;
  }
  .menu-toggle {
    display: inline-flex;
  }
  .nav.is-open .nav-links {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 74px;
    left: 0;
    right: 0;
    background: var(--surface);
    border: 1px solid var(--hairline);
    border-radius: 18px;
    padding: 12px;
    box-shadow: var(--shadow);
    backdrop-filter: blur(18px);
  }
  .nav.is-open .nav-actions {
    display: none;
  }
  .nav-disclaimer {
    display: none;
  }
  .hero {
    padding-top: 120px;
  }
  .feature-grid {
    grid-template-columns: 1fr;
  }
  .hero-actions {
    flex-direction: column;
  }
  .hero-actions .btn {
    width: 100%;
  }
  .mockup-body {
    grid-template-columns: 1fr;
    padding: 20px;
  }
  .mockup-headline {
    font-size: 20px;
  }
  .subscribe-form {
    flex-direction: column;
  }
  .subscribe-form .subscribe-btn {
    width: 100%;
    justify-content: center;
  }
  .testimonial-card {
    padding: 28px;
  }
  .testimonial-avatar {
    width: 120px;
    height: 120px;
  }
}