:root {
  --bg: #0d1020;
  --bg-alt: #131a31;
  --panel: rgba(18, 24, 48, 0.88);
  --panel-strong: #18203d;
  --text: #f7f3ec;
  --muted: #beb8cc;
  --line: rgba(255, 255, 255, 0.12);
  --accent: #ff7a59;
  --accent-2: #7f67ff;
  --accent-3: #ffca55;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  --radius: 22px;
  --radius-sm: 16px;
  --max: 1180px;
  color-scheme: dark;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(255, 122, 89, 0.22), transparent 28%),
    radial-gradient(circle at top right, rgba(127, 103, 255, 0.18), transparent 26%),
    linear-gradient(180deg, #0b0f1d 0%, #11162a 50%, #090b13 100%);
}

body.index-page {
  background:
    radial-gradient(circle at 15% 15%, rgba(255, 202, 85, 0.18), transparent 23%),
    radial-gradient(circle at 85% 10%, rgba(127, 103, 255, 0.22), transparent 28%),
    linear-gradient(180deg, #090d18 0%, #13162a 46%, #090b13 100%);
}

body.guide-page {
  background:
    radial-gradient(circle at 20% 20%, rgba(255, 122, 89, 0.18), transparent 24%),
    radial-gradient(circle at 80% 18%, rgba(255, 202, 85, 0.18), transparent 24%),
    linear-gradient(180deg, #0b1020 0%, #141c34 52%, #090b13 100%);
}

body.faq-page {
  background:
    radial-gradient(circle at 25% 18%, rgba(127, 103, 255, 0.18), transparent 24%),
    radial-gradient(circle at 78% 12%, rgba(255, 122, 89, 0.18), transparent 24%),
    linear-gradient(180deg, #070b16 0%, #12182e 54%, #080a12 100%);
}

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

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

.site-header,
.section,
.site-footer {
  width: min(var(--max), calc(100% - 32px));
  margin-left: auto;
  margin-right: auto;
}

.site-header {
  position: sticky;
  top: 14px;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 18px;
  margin-top: 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(10, 14, 28, 0.82);
  backdrop-filter: blur(18px);
  box-shadow: var(--shadow);
}

.brand-link {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.brand-logo {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  box-shadow: 0 10px 26px rgba(255, 122, 89, 0.28);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.brand-text strong {
  font-size: 1.02rem;
  letter-spacing: 0.02em;
}

.brand-text small {
  color: var(--muted);
  margin-top: 4px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
}

.site-nav a {
  padding: 10px 14px;
  border-radius: 999px;
  color: var(--muted);
  transition: 0.2s ease;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--text);
  background: rgba(255, 255, 255, 0.08);
}

.nav-toggle {
  display: none;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--text);
  border-radius: 999px;
  padding: 10px 14px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 20px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 700;
  letter-spacing: 0.02em;
  transition: transform 0.2s ease, background 0.2s ease, border-color 0.2s ease;
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.18);
}

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

.btn-primary {
  color: #15121a;
  background: linear-gradient(135deg, #ffca55, #ff7a59 52%, #ff5f8d);
}

.btn-ghost {
  border-color: rgba(255, 255, 255, 0.16);
  background: rgba(255, 255, 255, 0.05);
}

.btn-sm {
  padding: 10px 16px;
  min-height: 42px;
}

.btn-large {
  padding: 16px 26px;
  min-width: 170px;
}

.section {
  padding: 36px 0;
}

.hero,
.page-hero {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 28px;
  align-items: center;
  padding-top: 28px;
}

.eyebrow,
.kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
  color: #ffdd9a;
  font-size: 0.92rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero h1,
.page-hero h1 {
  margin: 0;
  font-size: clamp(2.4rem, 4vw, 4.8rem);
  line-height: 0.98;
  letter-spacing: -0.03em;
}

.lead {
  margin: 18px 0 0;
  color: #e9e5d8;
  font-size: 1.06rem;
  line-height: 1.9;
  max-width: 60ch;
}

.hero-actions,
.split-links,
.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-actions {
  margin-top: 24px;
}

.chip-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 0;
  margin: 24px 0 0;
}

.chip-list li {
  padding: 10px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: #f3efe6;
}

.hero-visual,
.page-hero-panel {
  position: relative;
}

.device-frame,
.page-hero-panel {
  padding: 18px;
  border-radius: calc(var(--radius) + 10px);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.03));
  border: 1px solid rgba(255, 255, 255, 0.14);
  box-shadow: var(--shadow);
}

.device-frame img,
.page-hero-panel img {
  width: 100%;
  border-radius: 18px;
}

.floating-card {
  position: absolute;
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 170px;
  padding: 14px 16px;
  border-radius: 18px;
  background: rgba(11, 15, 28, 0.92);
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: var(--shadow);
  animation: float 5s ease-in-out infinite;
}

.floating-card span,
.stat-card span {
  color: var(--muted);
  font-size: 0.94rem;
}

.floating-card strong {
  font-size: 1.2rem;
}

.floating-card small {
  color: #ffdd9a;
}

.floating-card-a {
  top: 18px;
  left: -10px;
}

.floating-card-b {
  right: 0;
  bottom: 24px;
  animation-delay: -2s;
}

.stats-section {
  padding-top: 18px;
}

.section-heading {
  margin-bottom: 18px;
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(1.5rem, 2.2vw, 2.4rem);
}

.stats-grid,
.feature-grid,
.showcase-grid,
.faq-mini-grid {
  display: grid;
  gap: 16px;
}

.stats-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.stat-card,
.feature-card,
.showcase-card,
.split-card,
.faq-mini-item,
.faq-item,
.cta-panel {
  border-radius: var(--radius);
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(14, 18, 35, 0.84);
  box-shadow: var(--shadow);
}

.stat-card {
  padding: 20px;
}

.stat-card strong {
  display: block;
  margin-bottom: 8px;
  font-size: 1.4rem;
}

.feature-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.feature-card {
  padding: 22px;
  min-height: 180px;
}

.feature-card h3,
.faq-item summary,
.faq-mini-item summary {
  margin: 0 0 10px;
  font-size: 1.1rem;
}

.feature-card p,
.split-card p,
.faq-item p,
.faq-mini-item p,
.showcase-card figcaption,
.site-footer p {
  color: var(--muted);
  line-height: 1.85;
}

.showcase-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.showcase-card {
  margin: 0;
  overflow: hidden;
}

.showcase-card img {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
}

.showcase-card figcaption {
  padding: 16px 18px 18px;
}

.split-section {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.split-card {
  padding: 24px;
}

.split-card.accent {
  background:
    radial-gradient(circle at top right, rgba(255, 122, 89, 0.12), transparent 35%),
    rgba(14, 18, 35, 0.92);
}

.split-card blockquote {
  margin: 14px 0 0;
  padding: 16px 18px;
  border-left: 4px solid var(--accent-3);
  background: rgba(255, 255, 255, 0.05);
  border-radius: 0 16px 16px 0;
  color: #f5ecd6;
  line-height: 1.8;
}

.faq-preview .faq-mini-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.faq-mini-item,
.faq-item {
  padding: 18px 20px;
}

.faq-mini-item summary,
.faq-item summary {
  list-style: none;
  cursor: pointer;
  font-weight: 700;
}

.faq-mini-item summary::-webkit-details-marker,
.faq-item summary::-webkit-details-marker {
  display: none;
}

.cta-panel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 24px 26px;
  background:
    linear-gradient(135deg, rgba(255, 202, 85, 0.16), rgba(255, 122, 89, 0.12)),
    rgba(14, 18, 35, 0.9);
}

.page-hero {
  padding-top: 30px;
}

.page-hero-panel {
  max-width: 520px;
  justify-self: end;
}

.timeline {
  display: grid;
  gap: 14px;
}

.timeline-item {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 16px;
  align-items: start;
  padding: 18px 20px;
  border-radius: var(--radius);
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(14, 18, 35, 0.84);
  box-shadow: var(--shadow);
}

.timeline-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  border-radius: 18px;
  font-weight: 800;
  font-size: 1.1rem;
  background: linear-gradient(135deg, rgba(255, 202, 85, 0.95), rgba(255, 122, 89, 0.95));
  color: #16131b;
}

.timeline-item h3 {
  margin: 0 0 8px;
}

.timeline-item p {
  margin: 0;
  color: var(--muted);
  line-height: 1.85;
}

.faq-list {
  display: grid;
  gap: 14px;
}

.faq-item {
  overflow: hidden;
}

.faq-item p {
  margin: 0;
}

.faq-item[open] summary {
  margin-bottom: 12px;
}

.site-footer {
  padding: 18px 0 36px;
}

.site-footer .footer-links {
  margin-bottom: 14px;
}

.site-footer p {
  margin: 6px 0 0;
}

.btn-primary:focus-visible,
.btn-ghost:focus-visible,
.site-nav a:focus-visible,
.nav-toggle:focus-visible,
.faq-item summary:focus-visible,
.faq-mini-item summary:focus-visible {
  outline: 3px solid rgba(255, 202, 85, 0.7);
  outline-offset: 3px;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

@media (max-width: 1080px) {
  .hero,
  .page-hero,
  .split-section,
  .cta-panel {
    grid-template-columns: 1fr;
  }

  .cta-panel {
    display: grid;
  }

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

  .page-hero-panel {
    justify-self: start;
  }
}

@media (max-width: 760px) {
  .site-header {
    border-radius: 24px;
    padding: 12px 14px;
    flex-wrap: wrap;
  }

  .nav-toggle {
    display: inline-flex;
    order: 2;
    margin-left: auto;
  }

  .site-nav {
    display: none;
    width: 100%;
    order: 4;
    margin-left: 0;
    flex-direction: column;
    align-items: stretch;
  }

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

  .site-nav a {
    width: 100%;
  }

  .site-header > .btn {
    order: 3;
  }

  .hero,
  .page-hero {
    grid-template-columns: 1fr;
  }

  .showcase-grid,
  .feature-grid,
  .stats-grid,
  .faq-preview .faq-mini-grid {
    grid-template-columns: 1fr;
  }

  .timeline-item {
    grid-template-columns: 1fr;
  }

  .timeline-num {
    width: 56px;
    height: 56px;
  }

  .floating-card {
    min-width: 146px;
    padding: 12px 14px;
  }

  .floating-card-a {
    left: 0;
  }

  .floating-card-b {
    right: 0;
  }

  .hero h1,
  .page-hero h1 {
    font-size: clamp(2rem, 10vw, 3.2rem);
  }
}