:root {
  --cream: #fff8eb;
  --cream-2: #fffdf8;
  --ink: #122042;
  --ink-soft: #2d3c63;
  --orange: #ff8a3d;
  --orange-soft: #ffe1c9;
  --purple: #b9a2ff;
  --purple-soft: #eee8ff;
  --blue-soft: #eaf0ff;
  --green-soft: #e6f7e9;
  --line: rgba(18, 32, 66, 0.12);
  --shadow: 0 20px 60px rgba(18, 32, 66, 0.12);
  --radius-xl: 30px;
  --radius-lg: 22px;
  --radius-md: 16px;
  --max: 1180px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(185, 162, 255, 0.25), transparent 32rem),
    radial-gradient(circle at top right, rgba(255, 138, 61, 0.18), transparent 28rem),
    var(--cream);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.75;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button, input, textarea { font: inherit; }
.skip-link {
  position: absolute;
  left: -999px;
  top: 10px;
  background: var(--ink);
  color: #fff;
  padding: 8px 14px;
  border-radius: 999px;
  z-index: 1000;
}
.skip-link:focus { left: 10px; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  backdrop-filter: blur(16px);
  background: rgba(255, 248, 235, 0.88);
  border-bottom: 1px solid var(--line);
}
.top-strip {
  max-width: var(--max);
  margin: 0 auto;
  padding: 8px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  font-size: 13px;
  color: var(--ink-soft);
}
.host-pill {
  background: rgba(255,255,255,.72);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px 10px;
}
.nav-wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}
.brand, .footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
}
.brand small {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--ink-soft);
  margin-top: -4px;
}
.main-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 6px;
}
.main-nav a {
  padding: 9px 13px;
  border-radius: 999px;
  color: var(--ink-soft);
  font-weight: 700;
  font-size: 15px;
}
.main-nav a:hover, .main-nav a.is-active {
  background: var(--ink);
  color: #fff;
}
.nav-toggle {
  display: none;
  border: 0;
  background: var(--ink);
  width: 44px;
  height: 44px;
  border-radius: 14px;
  padding: 10px;
}
.nav-toggle span {
  display: block;
  height: 2px;
  background: #fff;
  margin: 5px 0;
  border-radius: 2px;
}
.main { max-width: var(--max); margin: 0 auto; padding: 0 20px 70px; }
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(320px, .98fr);
  gap: 34px;
  align-items: center;
  padding: 54px 0 36px;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--ink);
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: 0 10px 30px rgba(18,32,66,.06);
  border-radius: 999px;
  padding: 7px 12px;
  font-weight: 800;
  font-size: 14px;
}
.hero h1, .page-hero h1 {
  font-size: clamp(36px, 6vw, 68px);
  line-height: 1.04;
  margin: 20px 0 18px;
  letter-spacing: -1.5px;
}
.hero p, .page-hero p {
  font-size: 18px;
  color: var(--ink-soft);
  margin: 0 0 22px;
}
.hero-actions, .action-row, .button-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 12px 18px;
  border-radius: 999px;
  font-weight: 800;
  border: 1px solid var(--line);
  cursor: pointer;
}
.btn-primary { background: var(--orange); color: #221102; border-color: transparent; box-shadow: 0 12px 30px rgba(255,138,61,.28); }
.btn-dark { background: var(--ink); color: #fff; border-color: transparent; }
.btn-light { background: #fff; color: var(--ink); }
.btn-ghost { background: rgba(255,255,255,.44); color: var(--ink); }
.hero-card, .surface-card, .feature-card, .playlist-card, .topic-card, .rating-card, .short-card, .faq-card, .form-card, .dynamic-card, .feed-card, .guide-card {
  background: rgba(255, 253, 248, 0.88);
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
}
.hero-card { padding: 20px; position: relative; overflow: hidden; }
.hero-card:before {
  content: "";
  position: absolute;
  inset: 18px auto auto 18px;
  width: 72px;
  height: 72px;
  background: var(--purple-soft);
  border-radius: 26px;
  transform: rotate(-8deg);
  z-index: -1;
}
.hero-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 18px;
}
.metric {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 14px;
}
.metric strong { display: block; font-size: 22px; line-height: 1.1; }
.metric span { color: var(--ink-soft); font-size: 13px; }
.note, .data-note {
  color: var(--ink-soft);
  font-size: 14px;
}
.data-note {
  padding: 10px 12px;
  border-radius: 14px;
  background: rgba(255,255,255,.66);
  border: 1px dashed rgba(18,32,66,.18);
}
.section { padding: 34px 0; }
.section-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 18px;
  margin-bottom: 20px;
}
.section-head h2 { font-size: clamp(26px, 3vw, 40px); line-height: 1.15; margin: 0; }
.section-head p { margin: 8px 0 0; color: var(--ink-soft); max-width: 700px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.surface-card, .feature-card, .topic-card, .rating-card, .short-card, .faq-card, .form-card, .dynamic-card, .feed-card, .guide-card { padding: 22px; }
.feature-card img, .topic-card img, .guide-card img { margin-bottom: 16px; border-radius: 20px; }
.feature-card h3, .playlist-card h3, .topic-card h3, .rating-card h3, .short-card h3, .faq-card h3, .surface-card h3, .feed-card h3, .guide-card h3 { margin: 0 0 8px; font-size: 21px; }
.feature-card p, .playlist-card p, .topic-card p, .rating-card p, .short-card p, .faq-card p, .surface-card p, .feed-card p, .guide-card p { margin: 0; color: var(--ink-soft); }
.tags { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0; }
.tag {
  display: inline-flex;
  padding: 5px 10px;
  background: var(--blue-soft);
  border-radius: 999px;
  color: var(--ink);
  font-size: 13px;
  font-weight: 800;
}
.tag.orange { background: var(--orange-soft); }
.tag.purple { background: var(--purple-soft); }
.tag.green { background: var(--green-soft); }
.playlist-card { overflow: hidden; }
.playlist-card .cover { width: 100%; height: 190px; object-fit: cover; border-radius: 26px 26px 10px 10px; }
.playlist-body { padding: 18px; }
.card-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 15px;
}
.like-btn, .save-btn, .share-btn {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  border-radius: 999px;
  padding: 8px 12px;
  cursor: pointer;
  font-weight: 800;
}
.like-btn.is-selected, .save-btn.is-selected, .share-btn.is-selected { background: var(--ink); color: #fff; }
.topic-card { position: relative; overflow: hidden; }
.topic-card:after {
  content: "";
  position: absolute;
  right: -30px;
  top: -30px;
  width: 110px;
  height: 110px;
  border-radius: 50%;
  background: rgba(255,138,61,.18);
}
.topic-meta, .rating-meta, .short-meta, .feed-meta {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
  color: var(--ink-soft);
  font-size: 14px;
  margin-top: 12px;
}
.stars { color: #ff9b31; letter-spacing: 1px; font-size: 18px; }
.rating-big { font-size: 40px; font-weight: 900; line-height: 1; }
.avatar-row { display: flex; align-items: center; margin: 14px 0 0; }
.avatar-row img, .comment img, .feed-user img { width: 38px; height: 38px; border-radius: 50%; border: 2px solid #fff; box-shadow: 0 8px 18px rgba(18,32,66,.14); }
.avatar-row img + img { margin-left: -10px; }
.comment-list { display: grid; gap: 14px; }
.comment {
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 12px;
  align-items: start;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 14px;
}
.comment-bubble strong { display: block; }
.comment-bubble p { margin: 4px 0 0; color: var(--ink-soft); }
.challenge {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 24px;
  align-items: center;
  padding: 24px;
}
.challenge img { border-radius: 24px; }
.progress {
  height: 12px;
  background: rgba(18,32,66,.1);
  border-radius: 999px;
  overflow: hidden;
  margin: 14px 0;
}
.progress span { display: block; height: 100%; width: var(--value, 60%); background: linear-gradient(90deg, var(--orange), var(--purple)); border-radius: inherit; }
.page-hero {
  padding: 54px 0 30px;
  display: grid;
  grid-template-columns: 1fr .72fr;
  gap: 30px;
  align-items: center;
}
.page-hero .hero-card img { border-radius: 24px; }
.pill-list { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.pill-list span { background: #fff; border: 1px solid var(--line); border-radius: 999px; padding: 8px 12px; font-weight: 800; }
.timeline { display: grid; gap: 14px; }
.timeline-item {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 16px;
  padding: 18px;
  border-radius: 22px;
  background: #fff;
  border: 1px solid var(--line);
}
.timeline-item strong { color: var(--orange); }
.filter-bar { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 20px; }
.filter-bar button {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  padding: 9px 14px;
  font-weight: 800;
  cursor: pointer;
}
.filter-bar button.is-active { background: var(--ink); color: #fff; }
.score-list { display: grid; gap: 12px; }
.score-line { display: grid; grid-template-columns: 1fr 120px 44px; align-items: center; gap: 12px; }
.score-line .bar { height: 10px; border-radius: 999px; background: rgba(18,32,66,.1); overflow: hidden; }
.score-line .bar span { display: block; height: 100%; border-radius: inherit; background: linear-gradient(90deg, var(--purple), var(--orange)); width: var(--score); }
.video-frame {
  aspect-ratio: 16 / 9;
  border-radius: 24px;
  overflow: hidden;
  background: linear-gradient(135deg, var(--ink), #4d3f91);
  display: grid;
  place-items: center;
  color: #fff;
  margin-bottom: 14px;
  position: relative;
}
.video-frame:before {
  content: "";
  width: 68px;
  height: 68px;
  border-radius: 50%;
  background: rgba(255,255,255,.18);
  border: 1px solid rgba(255,255,255,.36);
}
.video-frame:after {
  content: "";
  position: absolute;
  border-left: 18px solid #fff;
  border-top: 12px solid transparent;
  border-bottom: 12px solid transparent;
  transform: translateX(3px);
}
.contact-grid { display: grid; grid-template-columns: .95fr 1.05fr; gap: 20px; align-items: start; }
.form-grid { display: grid; gap: 12px; }
.form-grid label { font-weight: 800; }
.form-grid input, .form-grid textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #fff;
  padding: 12px 14px;
  color: var(--ink);
}
.form-grid textarea { min-height: 140px; resize: vertical; }
.alert-box {
  padding: 16px;
  border-radius: 18px;
  background: var(--purple-soft);
  color: var(--ink-soft);
  margin-top: 14px;
}
.site-footer {
  background: var(--ink);
  color: #fff;
  padding: 46px 20px 20px;
}
.footer-grid {
  max-width: var(--max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.45fr .7fr .7fr 1fr;
  gap: 24px;
}
.footer-grid p, .footer-grid a { color: rgba(255,255,255,.76); }
.footer-grid a { display: block; margin: 8px 0; }
.footer-grid h3 { margin: 0 0 10px; }
.footer-note { font-size: 14px; }
.footer-bottom {
  max-width: var(--max);
  margin: 28px auto 0;
  padding-top: 18px;
  border-top: 1px solid rgba(255,255,255,.14);
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  color: rgba(255,255,255,.66);
  font-size: 14px;
}
@media (max-width: 980px) {
  .hero, .page-hero, .challenge, .contact-grid { grid-template-columns: 1fr; }
  .grid-4, .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 760px) {
  .top-strip { flex-direction: column; align-items: flex-start; }
  .nav-toggle { display: block; }
  .main-nav {
    display: none;
    position: absolute;
    left: 20px;
    right: 20px;
    top: 112px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 24px;
    padding: 12px;
    box-shadow: var(--shadow);
  }
  .main-nav.is-open { display: grid; }
  .main-nav a { width: 100%; }
  .hero { padding-top: 34px; }
  .hero-metrics, .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .section-head { display: block; }
  .challenge { padding: 18px; }
  .timeline-item { grid-template-columns: 1fr; }
  .score-line { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero-actions .btn, .button-row .btn, .action-row .btn { width: 100%; }
}