:root {
  --bg: #0a0a0c;
  --bg-soft: #121218;
  --bg-card: #1a1a22;
  --line: #2a2a35;
  --text: #f2f2f5;
  --muted: #a0a0b0;
  --accent: #e11d48;
  --accent-hover: #f43f5e;
  --gold: #f59e0b;
  --max: 1180px;
  --radius: 12px;
  --font: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --display: "Noto Serif SC", "Songti SC", "SimSun", serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  min-height: 100vh;
  background-image:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(225, 29, 72, 0.18), transparent),
    radial-gradient(ellipse 60% 40% at 100% 50%, rgba(245, 158, 11, 0.06), transparent);
}

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

a {
  color: var(--accent-hover);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: #fda4af;
}

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

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 10, 12, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--text);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.02em;
}

.logo img {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  object-fit: cover;
}

.logo span {
  background: linear-gradient(135deg, #fff 30%, #fda4af);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav a {
  color: var(--muted);
  padding: 0.45rem 0.85rem;
  border-radius: 8px;
  font-size: 0.95rem;
}

.nav a:hover,
.nav a.active {
  color: var(--text);
  background: var(--bg-card);
}

.menu-toggle {
  display: none;
  background: var(--bg-card);
  border: 1px solid var(--line);
  color: var(--text);
  width: 42px;
  height: 42px;
  border-radius: 10px;
  cursor: pointer;
  font-size: 1.25rem;
}

/* Hero */
.hero {
  padding: 3.5rem 0 2.5rem;
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 2.5rem;
  align-items: center;
}

.hero-badge {
  display: inline-block;
  font-size: 0.8rem;
  color: var(--accent-hover);
  border: 1px solid rgba(225, 29, 72, 0.4);
  background: rgba(225, 29, 72, 0.12);
  padding: 0.3rem 0.75rem;
  border-radius: 999px;
  margin-bottom: 1rem;
}

.hero h1 {
  font-family: var(--display);
  font-size: clamp(1.85rem, 4vw, 2.75rem);
  line-height: 1.25;
  margin-bottom: 1rem;
  font-weight: 700;
}

.hero h1 em {
  font-style: normal;
  color: var(--accent-hover);
}

.hero-lead {
  color: var(--muted);
  font-size: 1.05rem;
  margin-bottom: 1.5rem;
  max-width: 36em;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.75rem 1.35rem;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.95rem;
  border: none;
  cursor: pointer;
  transition: transform 0.15s, background 0.2s, box-shadow 0.2s;
}

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

.btn-primary {
  background: linear-gradient(135deg, var(--accent), #be123c);
  color: #fff;
  box-shadow: 0 8px 24px rgba(225, 29, 72, 0.35);
}

.btn-primary:hover {
  color: #fff;
  background: linear-gradient(135deg, var(--accent-hover), var(--accent));
}

.btn-ghost {
  background: var(--bg-card);
  color: var(--text);
  border: 1px solid var(--line);
}

.btn-ghost:hover {
  color: var(--text);
  border-color: var(--muted);
}

.hero-visual {
  position: relative;
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
  animation: floatIn 0.8s ease both;
}

.hero-visual img {
  width: 100%;
  aspect-ratio: 9 / 14;
  object-fit: cover;
  object-position: top;
  max-height: 520px;
}

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

/* Sections */
.section {
  padding: 3rem 0;
}

.section-alt {
  background: linear-gradient(180deg, transparent, rgba(26, 26, 34, 0.6), transparent);
}

.section-head {
  margin-bottom: 1.75rem;
  max-width: 42em;
}

.section-head h2 {
  font-family: var(--display);
  font-size: clamp(1.4rem, 3vw, 1.85rem);
  margin-bottom: 0.6rem;
  line-height: 1.3;
}

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

.section-head .anchor-links {
  margin-top: 0.75rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.chip {
  display: inline-block;
  padding: 0.25rem 0.7rem;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.82rem;
}

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

/* Grids */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.feature-item {
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.25rem;
  transition: border-color 0.2s, transform 0.2s;
}

.feature-item:hover {
  border-color: rgba(225, 29, 72, 0.45);
  transform: translateY(-2px);
}

.feature-item h3 {
  font-size: 1.05rem;
  margin-bottom: 0.5rem;
}

.feature-item p {
  color: var(--muted);
  font-size: 0.92rem;
}

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

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

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

.shot {
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color 0.2s, transform 0.2s;
}

.shot:hover {
  border-color: rgba(225, 29, 72, 0.5);
  transform: translateY(-3px);
}

.shot img {
  width: 100%;
  aspect-ratio: 9 / 16;
  object-fit: cover;
  object-position: top;
  background: #111;
}

.shot.wide img {
  aspect-ratio: 16 / 10;
  object-position: top center;
}

.shot figcaption {
  padding: 0.85rem 1rem 1rem;
}

.shot figcaption strong {
  display: block;
  font-size: 0.95rem;
  margin-bottom: 0.25rem;
}

.shot figcaption span {
  color: var(--muted);
  font-size: 0.82rem;
}

/* Split */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: center;
}

.split.reverse {
  direction: rtl;
}

.split.reverse > * {
  direction: ltr;
}

.split-media {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line);
}

.split-media img {
  width: 100%;
  aspect-ratio: 9 / 14;
  object-fit: cover;
  object-position: top;
  max-height: 480px;
}

.split-body h3 {
  font-family: var(--display);
  font-size: 1.45rem;
  margin-bottom: 0.75rem;
}

.split-body p {
  color: var(--muted);
  margin-bottom: 0.9rem;
}

.split-body ul {
  margin: 0.75rem 0 1rem 1.2rem;
  color: var(--muted);
}

.split-body li {
  margin-bottom: 0.35rem;
}

/* Article / long SEO content */
.article {
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: clamp(1.25rem, 3vw, 2.25rem);
}

.article h2,
.article h3 {
  font-family: var(--display);
  margin: 1.75rem 0 0.75rem;
  line-height: 1.35;
}

.article h2:first-child {
  margin-top: 0;
}

.article p {
  color: #c8c8d4;
  margin-bottom: 1rem;
  text-align: justify;
}

.article ul,
.article ol {
  margin: 0 0 1rem 1.25rem;
  color: #c8c8d4;
}

.article li {
  margin-bottom: 0.4rem;
}

.toc {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 1rem 1.25rem;
  margin-bottom: 1.5rem;
}

.toc strong {
  display: block;
  margin-bottom: 0.5rem;
}

.toc ol {
  margin-left: 1.1rem;
  color: var(--muted);
}

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

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

/* FAQ */
.faq {
  display: grid;
  gap: 0.85rem;
}

.faq details {
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 1rem 1.15rem;
}

.faq summary {
  cursor: pointer;
  font-weight: 600;
  list-style: none;
}

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

.faq details[open] summary {
  color: var(--accent-hover);
  margin-bottom: 0.5rem;
}

.faq p {
  color: var(--muted);
  font-size: 0.95rem;
}

/* Page hero (inner pages) */
.page-hero {
  padding: 2.5rem 0 1.5rem;
  border-bottom: 1px solid var(--line);
  margin-bottom: 2rem;
}

.page-hero h1 {
  font-family: var(--display);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  margin-bottom: 0.5rem;
}

.page-hero p {
  color: var(--muted);
}

.breadcrumb {
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 0.75rem;
}

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

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

.prose {
  max-width: 820px;
}

.prose h2 {
  font-family: var(--display);
  font-size: 1.35rem;
  margin: 1.75rem 0 0.75rem;
}

.prose p,
.prose li {
  color: #c8c8d4;
  margin-bottom: 0.85rem;
}

.prose ul {
  margin-left: 1.25rem;
  margin-bottom: 1rem;
}

.prose .updated {
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
}

/* Error pages */
.error-page {
  min-height: 70vh;
  display: flex;
  align-items: center;
  text-align: center;
  padding: 3rem 0;
}

.error-page .code {
  font-family: var(--display);
  font-size: clamp(4rem, 12vw, 7rem);
  line-height: 1;
  background: linear-gradient(135deg, var(--accent), var(--gold));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: 0.5rem;
}

.error-page h1 {
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
}

.error-page p {
  color: var(--muted);
  margin-bottom: 1.5rem;
}

/* Footer */
.site-footer {
  margin-top: 3rem;
  border-top: 1px solid var(--line);
  background: #070709;
  padding: 2.5rem 0 1.5rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-brand {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
}

.footer-brand img {
  width: 48px;
  height: 48px;
  border-radius: 10px;
}

.footer-brand strong {
  display: block;
  margin-bottom: 0.35rem;
}

.footer-brand p {
  color: var(--muted);
  font-size: 0.9rem;
}

.footer-col h4 {
  margin-bottom: 0.75rem;
  font-size: 0.95rem;
}

.footer-col a {
  display: block;
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 0.45rem;
}

.footer-col a:hover {
  color: var(--accent-hover);
}

.footer-bottom {
  border-top: 1px solid var(--line);
  padding-top: 1.25rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem;
  color: var(--muted);
  font-size: 0.85rem;
}

.notice {
  margin-top: 1rem;
  padding: 0.85rem 1rem;
  background: rgba(245, 158, 11, 0.08);
  border: 1px solid rgba(245, 158, 11, 0.25);
  border-radius: 10px;
  color: #fcd34d;
  font-size: 0.88rem;
}

/* Animations */
@media (prefers-reduced-motion: no-preference) {
  .shot,
  .feature-item {
    animation: rise 0.6s ease both;
  }

  .shot:nth-child(2),
  .feature-item:nth-child(2) {
    animation-delay: 0.05s;
  }

  .shot:nth-child(3),
  .feature-item:nth-child(3) {
    animation-delay: 0.1s;
  }

  .shot:nth-child(4),
  .feature-item:nth-child(4) {
    animation-delay: 0.15s;
  }
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

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

  .split.reverse {
    direction: ltr;
  }

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

  .shot-grid,
  .shot-grid.cols-3 {
    grid-template-columns: 1fr 1fr;
  }

  .hero-visual img,
  .split-media img {
    max-height: 420px;
  }
}

@media (max-width: 720px) {
  .menu-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(10, 10, 12, 0.98);
    border-bottom: 1px solid var(--line);
    padding: 0.75rem 1rem 1rem;
    gap: 0.25rem;
  }

  .nav.open {
    display: flex;
  }

  .nav a {
    width: 100%;
    padding: 0.75rem 1rem;
  }

  .header-inner {
    position: relative;
  }

  .feature-grid,
  .shot-grid,
  .shot-grid.cols-3,
  .shot-grid.cols-2 {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 2rem;
  }

  .hero-actions {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .article p {
    text-align: left;
  }
}