/* 糖心Vlog APP - tangx.quest */
:root {
  --bg: #0c0c0e;
  --bg-elevated: #16161a;
  --bg-card: #1c1c22;
  --text: #f2f2f4;
  --text-muted: #a8a8b3;
  --accent: #e11d48;
  --accent-soft: #fb7185;
  --accent-dark: #be123c;
  --line: rgba(255, 255, 255, 0.08);
  --radius: 12px;
  --max: 1120px;
  --font-display: "ZCOOL XiaoWei", "Noto Serif SC", serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background:
    radial-gradient(ellipse 80% 50% at 10% -10%, rgba(225, 29, 72, 0.18), transparent 55%),
    radial-gradient(ellipse 60% 40% at 90% 0%, rgba(251, 113, 133, 0.1), transparent 50%),
    linear-gradient(180deg, #121218 0%, var(--bg) 28%, #0a0a0c 100%);
  background-attachment: fixed;
  color: var(--text);
  line-height: 1.75;
  font-size: 16px;
  min-height: 100vh;
}

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

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

a:hover {
  color: #fff;
}

ul,
ol {
  padding-left: 1.25rem;
}

li {
  margin: 0.35rem 0;
}

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

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(12, 12, 14, 0.88);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}

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

.brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  color: #fff;
  font-family: var(--font-display);
  font-size: 1.35rem;
  letter-spacing: 0.02em;
  flex-shrink: 0;
}

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

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

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1.1rem;
  align-items: center;
}

.nav a {
  color: var(--text-muted);
  font-size: 0.95rem;
  position: relative;
}

.nav a:hover,
.nav a.active {
  color: #fff;
}

.nav a.active::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -6px;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
}

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

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

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 2.5rem;
  align-items: center;
}

.hero-badge {
  display: inline-block;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--accent-soft);
  border: 1px solid rgba(225, 29, 72, 0.35);
  background: rgba(225, 29, 72, 0.12);
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  margin-bottom: 1rem;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 4vw, 2.75rem);
  line-height: 1.25;
  font-weight: 400;
  margin-bottom: 1rem;
  color: #fff;
}

.hero-lead {
  color: var(--text-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: 0.85rem 1.4rem;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.95rem;
  border: none;
  cursor: pointer;
  transition: transform 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
}

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

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: #fff;
  box-shadow: 0 10px 28px rgba(225, 29, 72, 0.35);
}

.btn-primary:hover {
  color: #fff;
}

.btn-ghost {
  background: transparent;
  color: #fff;
  border: 1px solid var(--line);
}

.btn-ghost:hover {
  border-color: rgba(255, 255, 255, 0.28);
  color: #fff;
}

.hero-visual {
  position: relative;
}

.hero-visual img {
  width: 100%;
  border-radius: 16px;
  border: 1px solid var(--line);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
  animation: floatIn 0.9s ease both;
}

.hero-visual::after {
  content: "";
  position: absolute;
  inset: auto -8% -12% 20%;
  height: 40%;
  background: radial-gradient(ellipse, rgba(225, 29, 72, 0.35), transparent 70%);
  z-index: -1;
  pointer-events: none;
}

@keyframes floatIn {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Sections */
.section {
  padding: 3.25rem 0;
}

.section-alt {
  background: rgba(255, 255, 255, 0.02);
  border-block: 1px solid var(--line);
}

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

.section-head h2 {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 400;
  color: #fff;
  margin-bottom: 0.65rem;
}

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

.prose {
  color: var(--text-muted);
}

.prose h2,
.prose h3 {
  color: #fff;
  font-family: var(--font-display);
  font-weight: 400;
  margin: 1.75rem 0 0.75rem;
}

.prose h2 {
  font-size: 1.55rem;
}

.prose h3 {
  font-size: 1.2rem;
}

.prose p {
  margin-bottom: 1rem;
}

.prose strong {
  color: #fff;
  font-weight: 600;
}

/* Feature / category grids */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.15rem;
}

.feature-item {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.35rem;
  transition: border-color 0.2s ease, transform 0.25s ease;
  animation: fadeUp 0.6s ease both;
}

.feature-item:hover {
  border-color: rgba(225, 29, 72, 0.4);
  transform: translateY(-3px);
}

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

.feature-item p {
  color: var(--text-muted);
  font-size: 0.94rem;
}

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

.shot-card {
  background: var(--bg-elevated);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform 0.25s ease, border-color 0.2s ease;
}

.shot-card:hover {
  transform: translateY(-4px);
  border-color: rgba(251, 113, 133, 0.35);
}

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

.shot-card figcaption {
  padding: 0.85rem 0.95rem 1rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

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

.shot-grid.wide .shot-card img {
  aspect-ratio: 3 / 4;
}

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

.split img {
  border-radius: var(--radius);
  border: 1px solid var(--line);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.35);
}

.split.reverse .split-text {
  order: 2;
}

.split.reverse .split-media {
  order: 1;
}

/* FAQ */
.faq-list details {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 1rem 1.15rem;
  margin-bottom: 0.75rem;
}

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

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

.faq-list summary::before {
  content: "+";
  color: var(--accent-soft);
  margin-right: 0.6rem;
  font-weight: 700;
}

.faq-list details[open] summary::before {
  content: "−";
}

.faq-list details p {
  margin-top: 0.75rem;
  color: var(--text-muted);
}

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

.page-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3.5vw, 2.3rem);
  font-weight: 400;
  color: #fff;
  margin-bottom: 0.5rem;
}

.breadcrumb {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 0.75rem;
}

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

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

.page-body {
  padding: 2.5rem 0 3.5rem;
}

.legal-box {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.75rem 1.5rem;
}

/* Error pages */
.error-page {
  min-height: 70vh;
  display: flex;
  align-items: center;
  text-align: center;
  padding: 4rem 0;
}

.error-page .code {
  font-family: var(--font-display);
  font-size: clamp(4rem, 12vw, 7rem);
  line-height: 1;
  background: linear-gradient(135deg, #fff, var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: 0.75rem;
}

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

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

/* Footer */
.site-footer {
  border-top: 1px solid var(--line);
  background: #09090b;
  padding: 2.5rem 0 1.5rem;
  margin-top: 2rem;
}

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

.footer-brand {
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: #fff;
  margin-bottom: 0.65rem;
}

.footer-grid p,
.footer-grid a {
  color: var(--text-muted);
  font-size: 0.92rem;
}

.footer-grid h4 {
  color: #fff;
  font-size: 0.95rem;
  margin-bottom: 0.85rem;
  font-weight: 600;
}

.footer-links {
  list-style: none;
  padding: 0;
}

.footer-links a {
  display: inline-block;
  padding: 0.25rem 0;
}

.footer-bottom {
  border-top: 1px solid var(--line);
  padding-top: 1.15rem;
  color: #6e6e78;
  font-size: 0.85rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
  justify-content: space-between;
}

.toc {
  background: var(--bg-elevated);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.15rem 1.25rem;
  margin: 1.5rem 0;
}

.toc h3 {
  color: #fff;
  font-size: 1rem;
  margin-bottom: 0.65rem;
}

.toc ol {
  margin: 0;
  color: var(--text-muted);
}

.keyword-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}

.keyword-cloud a {
  background: rgba(225, 29, 72, 0.12);
  border: 1px solid rgba(225, 29, 72, 0.25);
  color: var(--accent-soft);
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  font-size: 0.85rem;
}

.keyword-cloud a:hover {
  background: rgba(225, 29, 72, 0.25);
  color: #fff;
}

/* Mobile */
@media (max-width: 900px) {
  .hero-grid,
  .split,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .split.reverse .split-text,
  .split.reverse .split-media {
    order: unset;
  }

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

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

  .nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .nav {
    display: none;
    position: absolute;
    left: 1rem;
    right: 1rem;
    top: calc(100% + 0.35rem);
    background: var(--bg-elevated);
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 0.85rem 1rem;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.85rem;
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.45);
  }

  .nav.open {
    display: flex;
  }

  .nav a.active::after {
    display: none;
  }

  .header-inner {
    position: relative;
  }
}

@media (max-width: 560px) {
  .feature-grid {
    grid-template-columns: 1fr;
  }

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

  .hero {
    padding-top: 2rem;
  }

  .hero-actions {
    width: 100%;
  }

  .hero-actions .btn {
    flex: 1 1 100%;
  }

  .footer-bottom {
    flex-direction: column;
  }
}