:root {
  --indigo-700: #4338ca;
  --indigo-600: #4f46e5;
  --indigo-500: #6366f1;
  --blue-600: #2563eb;
  --blue-500: #3b82f6;
  --blue-400: #60a5fa;
  --blue-100: #dbeafe;
  --blue-50: #eff6ff;
  --ink: #111827;
  --muted: #6b7280;
  --line: #e5e7eb;
  --bg: #f5f7fa;
  --surface: #ffffff;
  --shadow: 0 18px 48px rgba(79, 70, 229, 0.12);
  --radius: 18px;
  --font-display: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --wrap: min(1120px, calc(100% - 2.5rem));
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  background:
    radial-gradient(900px 420px at 8% -8%, rgba(96, 165, 250, 0.22), transparent 55%),
    radial-gradient(700px 380px at 100% 0%, rgba(99, 102, 241, 0.14), transparent 50%),
    linear-gradient(180deg, #eef2ff 0%, var(--bg) 32%, #f8fafc 100%);
  min-height: 100vh;
}

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

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

.wrap {
  width: var(--wrap);
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(14px);
  background: rgba(255, 255, 255, 0.9);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-text strong {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.brand-text em {
  font-style: normal;
  font-size: 0.72rem;
  color: var(--blue-500);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-weight: 600;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.site-nav a {
  font-size: 0.95rem;
  color: var(--muted);
  transition: color 0.2s ease;
}

.site-nav a:hover {
  color: var(--indigo-600);
}

.nav-cta {
  padding: 0.45rem 0.9rem;
  border-radius: 999px;
  background: var(--indigo-600);
  color: #fff !important;
}

.nav-cta:hover {
  background: var(--indigo-700);
  color: #fff !important;
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  padding: 0;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 5px auto;
  background: var(--indigo-600);
  transition: transform 0.25s ease, opacity 0.2s ease;
}

.nav-toggle[aria-expanded="true"] span:first-child {
  transform: translateY(3.5px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:last-child {
  transform: translateY(-3.5px) rotate(-45deg);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  min-height: 48px;
  padding: 0.7rem 1.25rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, color 0.2s ease;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: linear-gradient(135deg, var(--blue-400), var(--indigo-600));
  color: #fff;
  box-shadow: 0 12px 28px rgba(79, 70, 229, 0.28);
}

.btn-primary:hover {
  box-shadow: 0 16px 36px rgba(79, 70, 229, 0.36);
}

.btn-ghost {
  background: #fff;
  border-color: var(--line);
  color: var(--indigo-600);
}

.btn-ghost-light {
  background: transparent;
  border-color: rgba(255, 255, 255, 0.45);
  color: #fff;
}

.btn-text {
  background: transparent;
  color: var(--indigo-600);
  min-height: auto;
  padding: 0.4rem 0.2rem;
  border-radius: 0;
  box-shadow: none;
}

.btn-text:hover {
  color: var(--blue-600);
  transform: none;
}

/* 首屏：产品亮点 */
.impact {
  position: relative;
  min-height: calc(100vh - 68px);
  display: flex;
  align-items: center;
  padding: clamp(2rem, 5vw, 3.5rem) 0 clamp(2.5rem, 6vw, 4rem);
  overflow: hidden;
}

.impact-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(900px 480px at 12% 0%, rgba(96, 165, 250, 0.35), transparent 55%),
    radial-gradient(700px 420px at 100% 20%, rgba(99, 102, 241, 0.22), transparent 50%),
    linear-gradient(180deg, #eef2ff 0%, #f5f7fa 70%, #ffffff 100%);
  pointer-events: none;
}

.impact-inner {
  position: relative;
  width: var(--wrap);
  margin-inline: auto;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: clamp(1.4rem, 3vw, 2rem);
}

.impact-copy {
  max-width: 40rem;
}

.impact-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 6vw, 4rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.12;
  color: var(--ink);
}

.impact-lead {
  margin: 0.85rem 0 0;
  max-width: 32rem;
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--muted);
}

.impact-metrics {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.impact-metrics li {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: clamp(1.1rem, 2.5vw, 1.5rem);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid #e0e7ff;
  box-shadow: 0 16px 40px rgba(79, 70, 229, 0.1);
}

.impact-metrics strong {
  font-size: clamp(2rem, 4.5vw, 2.75rem);
  font-weight: 700;
  line-height: 1;
  color: var(--indigo-600);
  letter-spacing: -0.02em;
}

.impact-metrics span {
  font-size: clamp(0.95rem, 1.6vw, 1.1rem);
  font-weight: 600;
  color: var(--ink);
}

.impact-metrics em {
  font-style: normal;
  font-size: 0.85rem;
  color: var(--muted);
  line-height: 1.4;
}

.impact-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1rem;
}

.impact-more {
  align-self: flex-start;
  font-size: 0.9rem;
  color: var(--indigo-600);
  font-weight: 600;
}

.impact-more:hover {
  color: var(--blue-600);
}

.hero {
  position: relative;
  padding: clamp(2.5rem, 6vw, 5rem) 0 clamp(3rem, 7vw, 5.5rem);
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(120deg, rgba(219, 234, 254, 0.7), transparent 42%),
    repeating-linear-gradient(
      -18deg,
      rgba(79, 70, 229, 0.03) 0 2px,
      transparent 2px 14px
    );
  pointer-events: none;
}

.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: center;
}

.eyebrow {
  margin: 0 0 0.75rem;
  color: var(--blue-600);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.08em;
}

.brand-hero {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 7vw, 4.4rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.1;
  color: var(--ink);
}

.hero-lead {
  margin: 1rem 0 1.75rem;
  max-width: 28rem;
  font-size: clamp(1.05rem, 2.2vw, 1.2rem);
  color: var(--muted);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1rem;
}

.hero-visual {
  display: flex;
  justify-content: center;
  align-items: flex-start;
}

.hero-carousel {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  width: min(220px, 42vw);
}

.phone-frame {
  width: min(260px, 72vw);
  border-radius: 28px;
  padding: 10px;
  background: linear-gradient(160deg, #1e293b, #0f172a);
  box-shadow: var(--shadow);
}

.phone-frame img {
  width: 100%;
  border-radius: 20px;
  display: block;
  background: #f5f7fa;
}

.phone-frame-hero {
  width: 100%;
  padding: 8px;
  border-radius: 24px;
}

.phone-frame-hero .carousel-viewport {
  position: relative;
  overflow: hidden;
  border-radius: 18px;
  aspect-ratio: 460 / 920;
  background: #f5f7fa;
}

.phone-frame-hero .carousel-track {
  position: absolute;
  inset: 0;
}

.phone-frame-hero .carousel-track img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
  border-radius: 18px;
  opacity: 0;
  transform: translateX(12px);
  transition: opacity 0.45s ease, transform 0.45s ease;
  pointer-events: none;
}

.phone-frame-hero .carousel-track img.is-active {
  opacity: 1;
  transform: none;
  pointer-events: auto;
  z-index: 1;
}

.carousel-meta {
  width: 100%;
  text-align: center;
}

.carousel-caption {
  margin: 0 0 0.45rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--muted);
}

.carousel-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
}

.carousel-btn {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--indigo-600);
  font-size: 1.2rem;
  line-height: 1;
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease;
}

.carousel-btn:hover {
  background: var(--blue-50);
  border-color: #c7d2fe;
}

.carousel-dots {
  display: flex;
  gap: 6px;
  align-items: center;
}

.carousel-dots button {
  width: 7px;
  height: 7px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: #cbd5e1;
  cursor: pointer;
  transition: transform 0.2s ease, background 0.2s ease;
}

.carousel-dots button.is-active {
  background: var(--indigo-600);
  transform: scale(1.25);
}

.showcase {
  background: linear-gradient(180deg, rgba(79, 70, 229, 0.05), transparent 40%);
}

.showcase-phones {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1.25rem;
  align-items: start;
}

.shot-phone,
.shot-desktop {
  margin: 0;
}

.shot-phone {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.85rem;
}

.shot-phone .phone-frame {
  width: 100%;
  max-width: 220px;
}

.shot-phone figcaption,
.shot-desktop figcaption {
  text-align: center;
  display: grid;
  gap: 0.25rem;
}

.shot-phone figcaption strong,
.shot-desktop figcaption strong {
  font-size: 1rem;
  color: var(--ink);
}

.shot-phone figcaption span,
.shot-desktop figcaption span {
  font-size: 0.85rem;
  color: var(--muted);
}

.shot-desktop {
  margin-top: 2.5rem;
}

.desktop-frame {
  border-radius: 16px;
  overflow: hidden;
  background: #0f172a;
  box-shadow: var(--shadow);
  border: 1px solid #e5e7eb;
}

.desktop-bar {
  display: flex;
  gap: 6px;
  padding: 10px 14px;
  background: #1e293b;
}

.desktop-bar span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #64748b;
}

.desktop-bar span:nth-child(1) { background: #f87171; }
.desktop-bar span:nth-child(2) { background: #fbbf24; }
.desktop-bar span:nth-child(3) { background: #34d399; }

.desktop-frame img {
  width: 100%;
  display: block;
  background: #f5f7fa;
}

.shot-desktop figcaption {
  margin-top: 1rem;
}

/* Features */

.section {
  padding: clamp(3.5rem, 8vw, 5.5rem) 0;
}

.section-head {
  max-width: 36rem;
  margin-bottom: 2.25rem;
}

.section-head h2 {
  margin: 0 0 0.6rem;
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3.5vw, 2.2rem);
  font-weight: 700;
  color: var(--ink);
}

.section-head p {
  margin: 0;
  color: var(--muted);
}

.scene-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.scene-list li {
  padding: 1.4rem 1.35rem 1.5rem;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--line);
  box-shadow: 0 8px 24px rgba(17, 24, 39, 0.04);
}

.scene-tag {
  display: inline-block;
  margin-bottom: 0.7rem;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  background: var(--blue-50);
  color: var(--blue-600);
  font-size: 0.75rem;
  font-weight: 600;
}

.scene-list strong {
  display: block;
  margin-bottom: 0.45rem;
  font-size: 1.1rem;
}

.scene-list p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.features {
  background: linear-gradient(180deg, rgba(79, 70, 229, 0.04), transparent 45%);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.feature-grid article {
  padding: 1.5rem;
  border-radius: var(--radius);
  background: #fff;
  border: 1px solid var(--line);
}

.feature-grid img {
  margin-bottom: 0.9rem;
}

.feature-grid h3 {
  margin: 0 0 0.45rem;
  font-size: 1.1rem;
  color: var(--ink);
}

.feature-grid p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.flow-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.85rem;
}

.flow-steps li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem 1.25rem;
  align-items: start;
  padding: 1.2rem 1.3rem;
  border-radius: var(--radius);
  background: #fff;
  border: 1px solid var(--line);
}

.step-num {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--indigo-600);
  line-height: 1;
  min-width: 2.4rem;
}

.flow-steps h3 {
  margin: 0 0 0.35rem;
  font-size: 1.05rem;
}

.flow-steps p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.entry-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.entry-card {
  padding: 1.75rem;
  border-radius: calc(var(--radius) + 4px);
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.entry-card-accent {
  background: linear-gradient(160deg, #60a5fa 0%, #4f46e5 100%);
  color: #eff6ff;
  border-color: transparent;
}

.entry-card-accent p,
.entry-card-accent .entry-label {
  color: rgba(239, 246, 255, 0.88);
}

.entry-label {
  margin: 0 0 0.5rem;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--blue-600);
}

.entry-card h3 {
  margin: 0 0 0.7rem;
  font-size: 1.5rem;
  font-weight: 700;
}

.entry-card > p {
  margin: 0 0 1.1rem;
}

.entry-hint {
  margin: 0 !important;
  padding: 0.75rem 0.9rem;
  border-radius: 12px;
  background: var(--blue-50);
  color: var(--blue-600) !important;
  font-size: 0.9rem;
}

.entry-card-accent .btn-primary {
  background: #fff;
  color: var(--indigo-600);
  box-shadow: none;
}

.contact {
  padding-bottom: clamp(4rem, 9vw, 6rem);
}

.contact-panel {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: clamp(1.75rem, 4vw, 2.5rem);
  border-radius: 24px;
  background:
    radial-gradient(480px 200px at 100% 0%, rgba(96, 165, 250, 0.35), transparent 55%),
    linear-gradient(135deg, #4f46e5, #1e3a8a);
  color: #eff6ff;
  box-shadow: var(--shadow);
}

.contact-panel h2 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
}

.contact-panel p {
  margin: 0;
  max-width: 34rem;
  color: rgba(239, 246, 255, 0.85);
}

.contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 2rem 0 2.5rem;
  background: rgba(255, 255, 255, 0.75);
}

.footer-inner {
  display: grid;
  gap: 0.45rem;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-size: 1.05rem;
  font-weight: 700;
}

.footer-inner > p {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.footer-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem 0.7rem;
  align-items: center;
}

.footer-meta a:hover {
  color: var(--indigo-600);
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

.reveal-delay {
  transition-delay: 0.12s;
}

.hero-copy.reveal.is-visible .brand-hero {
  animation: brandRise 0.85s cubic-bezier(0.2, 0.8, 0.2, 1) both;
}

@keyframes brandRise {
  from {
    opacity: 0;
    transform: translateY(16px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .reveal,
  .reveal-delay,
  .btn {
    transition: none !important;
    animation: none !important;
    opacity: 1 !important;
    transform: none !important;
  }
}

@media (max-width: 900px) {
  .hero-grid,
  .scene-list,
  .feature-grid,
  .entry-grid {
    grid-template-columns: 1fr;
  }

  .showcase-phones {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hero-carousel {
    width: min(180px, 48vw);
  }

  .hero {
    padding-top: 1.5rem;
    padding-bottom: 2rem;
  }

  .impact {
    min-height: auto;
    padding: 1.75rem 0 2.25rem;
  }

  .impact-metrics {
    gap: 0.65rem;
  }

  .impact-metrics li {
    padding: 0.95rem 0.85rem;
    border-radius: 16px;
  }

  .impact-metrics em {
    display: none;
  }
}

@media (max-width: 760px) {
  :root {
    --wrap: min(1120px, calc(100% - 1.5rem));
  }

  .nav-toggle {
    display: inline-block;
  }

  .site-nav {
    position: absolute;
    top: calc(100% + 1px);
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0.75rem 1rem 1rem;
    background: rgba(255, 255, 255, 0.98);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 16px 30px rgba(17, 24, 39, 0.08);
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav a {
    padding: 0.85rem 0.4rem;
    border-bottom: 1px solid #f3f4f6;
  }

  .site-nav .nav-cta {
    margin-top: 0.5rem;
    text-align: center;
    border-bottom: 0;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .btn {
    width: 100%;
  }

  .btn-text {
    width: auto;
    align-self: flex-start;
  }

  .contact-actions {
    width: 100%;
  }

  .contact-actions .btn {
    flex: 1 1 auto;
  }

  .hero-carousel {
    width: min(150px, 42vw);
  }

  .hero-grid {
    gap: 1rem;
  }

  .brand-hero {
    font-size: clamp(2.1rem, 9vw, 2.8rem);
  }

  .hero-lead {
    margin: 0.7rem 0 1.1rem;
    font-size: 0.98rem;
  }

  .impact-metrics {
    grid-template-columns: 1fr;
  }

  .impact-title {
    font-size: clamp(2rem, 9vw, 2.6rem);
  }

  .impact-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .impact-actions .btn {
    width: 100%;
  }

  .impact-actions .btn-text {
    width: auto;
    align-self: flex-start;
  }

  .phone-frame-hero .carousel-viewport {
    aspect-ratio: 460 / 860;
  }

  .showcase-phones {
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
  }

  .shot-phone .phone-frame {
    max-width: none;
  }
}