:root {
  --bg: #f7f5f2;
  --bg-alt: #efeae3;
  --surface: #ffffff;
  --ink: #1a1c1e;
  --muted: #5c636a;
  --line: #ddd6cc;
  --brand: #c43d5a;
  --brand-dark: #9e2f47;
  --accent: #0f6b6b;
  --accent-soft: #e6f3f3;
  --shadow: 0 10px 30px rgba(26, 28, 30, 0.08);
  --radius: 14px;
  --max: 1120px;
  --font-display: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(196, 61, 90, 0.08), transparent 35%),
    radial-gradient(circle at top right, rgba(15, 107, 107, 0.08), transparent 30%),
    linear-gradient(180deg, #fbf9f6 0%, var(--bg) 40%, #f3efe9 100%);
  line-height: 1.75;
  min-height: 100vh;
}

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

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  color: var(--brand);
}

.container {
  width: min(100% - 2rem, var(--max));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  background: rgba(247, 245, 242, 0.92);
  border-bottom: 1px solid rgba(221, 214, 204, 0.8);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--ink);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.02em;
}

.logo img {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  object-fit: cover;
}

.nav {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.nav a {
  color: var(--ink);
  padding: 0.45rem 0.75rem;
  border-radius: 999px;
  font-size: 0.95rem;
}

.nav a:hover,
.nav a.active {
  background: var(--accent-soft);
  color: var(--accent);
}

.menu-toggle {
  display: none;
  border: 1px solid var(--line);
  background: var(--surface);
  border-radius: 10px;
  width: 42px;
  height: 42px;
  padding: 0;
  cursor: pointer;
  color: var(--ink);
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
}

.menu-toggle-bar {
  display: block;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

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

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

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

.hero {
  padding: 3.2rem 0 2rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 2rem;
  align-items: center;
}

.eyebrow {
  display: inline-block;
  color: var(--brand);
  font-weight: 700;
  letter-spacing: 0.08em;
  font-size: 0.82rem;
  margin-bottom: 0.8rem;
}

.hero h1 {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 4vw, 2.8rem);
  line-height: 1.25;
  letter-spacing: -0.02em;
}

.hero-lead {
  font-size: 1.05rem;
  color: var(--muted);
  margin: 0 0 1.4rem;
  max-width: 36rem;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1.2rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.8rem 1.25rem;
  border-radius: 12px;
  font-weight: 700;
  border: 1px solid transparent;
  transition: 0.2s ease;
}

.btn-primary {
  background: var(--brand);
  color: #fff;
}

.btn-primary:hover {
  background: var(--brand-dark);
  color: #fff;
}

.btn-secondary {
  background: var(--surface);
  border-color: var(--line);
  color: var(--ink);
}

.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.hero-visual {
  position: relative;
}

.hero-visual img {
  width: 100%;
  border-radius: 18px;
  box-shadow: var(--shadow);
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.section {
  padding: 2.8rem 0;
}

.section-alt {
  background: rgba(255, 255, 255, 0.55);
  border-block: 1px solid rgba(221, 214, 204, 0.55);
}

.section-head {
  margin-bottom: 1.5rem;
  max-width: 46rem;
}

.section-head h2 {
  margin: 0 0 0.7rem;
  font-size: clamp(1.45rem, 2.5vw, 1.9rem);
  line-height: 1.3;
}

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

.prose {
  max-width: 48rem;
}

.prose p {
  margin: 0 0 1rem;
  color: #2b3036;
}

.prose h2,
.prose h3 {
  margin: 1.8rem 0 0.8rem;
  line-height: 1.35;
}

.prose ul,
.prose ol {
  margin: 0 0 1.1rem;
  padding-left: 1.2rem;
}

.prose li {
  margin-bottom: 0.45rem;
}

.feature-grid,
.channel-grid,
.shot-grid,
.card-grid {
  display: grid;
  gap: 1rem;
}

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

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

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

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

.feature-card,
.channel-card,
.content-card,
.info-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.feature-card,
.info-card {
  padding: 1.2rem;
}

.feature-card h3,
.channel-card h3,
.content-card h3,
.info-card h3 {
  margin: 0 0 0.55rem;
  font-size: 1.05rem;
}

.feature-card p,
.channel-card p,
.content-card p,
.info-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.channel-card img,
.content-card img,
.shot-card img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.channel-card,
.content-card,
.shot-card {
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.channel-card:hover,
.content-card:hover,
.shot-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 14px 34px rgba(26, 28, 30, 0.12);
}

.channel-card .body,
.content-card .body {
  padding: 0.95rem 1rem 1.1rem;
}

.shot-card {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--surface);
}

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.4rem;
  align-items: center;
}

.split img {
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  width: 100%;
  aspect-ratio: 16 / 11;
  object-fit: cover;
}

.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

.step {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.1rem;
}

.step-num {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 700;
  margin-bottom: 0.7rem;
}

.faq details {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.9rem 1rem;
  margin-bottom: 0.7rem;
}

.faq summary {
  cursor: pointer;
  font-weight: 700;
}

.faq p {
  margin: 0.7rem 0 0;
  color: var(--muted);
}

.breadcrumb {
  padding: 1.1rem 0 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.breadcrumb a {
  color: var(--muted);
}

.page-hero {
  padding: 1.6rem 0 0.4rem;
}

.page-hero h1 {
  margin: 0 0 0.7rem;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
}

.page-hero p {
  margin: 0;
  color: var(--muted);
  max-width: 42rem;
}

.legal {
  padding: 1.2rem 0 3rem;
}

.legal .panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.4rem 1.5rem;
  box-shadow: var(--shadow);
}

.error-page {
  min-height: 70vh;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 3rem 1rem;
}

.error-page h1 {
  margin: 0 0 0.6rem;
  font-size: clamp(2rem, 6vw, 3.4rem);
}

.error-page p {
  color: var(--muted);
  margin: 0 0 1.3rem;
}

.site-footer {
  margin-top: 2rem;
  background: #17191b;
  color: #d7dde3;
  padding: 2.4rem 0 1.6rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.site-footer a {
  color: #d7dde3;
}

.site-footer a:hover {
  color: #fff;
}

.site-footer h3 {
  margin: 0 0 0.8rem;
  font-size: 1rem;
  color: #fff;
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding-top: 1rem;
  font-size: 0.9rem;
  color: #9aa3ab;
}

.keywords {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 1rem;
}

.keywords span,
.keywords a {
  display: inline-block;
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  background: var(--bg-alt);
  border: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.86rem;
}

.toc {
  background: var(--accent-soft);
  border: 1px solid #cfe5e5;
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
  margin: 1.2rem 0 1.6rem;
}

.toc h2 {
  margin: 0 0 0.6rem;
  font-size: 1rem;
}

.toc ol {
  margin: 0;
  padding-left: 1.1rem;
}

.toc a {
  color: var(--ink);
}

@media (max-width: 960px) {
  .hero-grid,
  .split,
  .card-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .feature-grid,
  .channel-grid,
  .shot-grid,
  .steps {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 720px) {
  .menu-toggle {
    display: inline-flex;
  }

  .nav {
    display: none;
    position: absolute;
    left: 1rem;
    right: 1rem;
    top: 68px;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 0.6rem;
    flex-direction: column;
    align-items: stretch;
    box-shadow: var(--shadow);
  }

  .nav.open {
    display: flex;
  }

  .nav a {
    padding: 0.75rem 0.9rem;
  }

  .feature-grid,
  .channel-grid,
  .shot-grid,
  .steps {
    grid-template-columns: 1fr;
  }

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