:root {
  --paper: #f4f2ec;
  --paper-deep: #e8e4da;
  --ink: #183033;
  --muted: #5e6e6d;
  --teal: #0d766e;
  --teal-soft: #d9ece7;
  --coral: #ed6a4b;
  --line: rgba(24, 48, 51, 0.16);
}

* {
  box-sizing: border-box;
}

html {
  background: var(--paper);
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Noto Sans SC", "Microsoft YaHei", "PingFang SC", sans-serif;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.top-rule {
  height: 6px;
  background: linear-gradient(90deg, var(--teal) 0 70%, var(--coral) 70% 100%);
}

.site-header,
main,
.site-footer {
  width: min(1180px, calc(100% - 48px));
  margin-inline: auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 76px;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 34px;
  height: 34px;
  color: #fff;
  background: var(--teal);
  border-radius: 50%;
  place-items: center;
  font-size: 15px;
}

.duration {
  padding: 6px 12px;
  color: var(--teal);
  background: var(--teal-soft);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 700;
}

.video-section {
  padding: 58px 0 0;
}

.heading-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(260px, 0.6fr);
  column-gap: 48px;
  align-items: end;
  margin-bottom: 28px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--coral);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.12em;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 0;
  font-family: "Songti SC", "SimSun", serif;
  font-size: clamp(38px, 5vw, 66px);
  font-weight: 700;
  letter-spacing: 0;
  line-height: 1.12;
}

.intro {
  max-width: 420px;
  margin: 0;
  color: var(--muted);
  font-size: 16px;
}

.player-shell {
  position: relative;
  overflow: hidden;
  background: #122527;
  border-radius: 8px;
  box-shadow: 0 24px 60px rgba(24, 48, 51, 0.14);
}

.video-player {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #122527;
  object-fit: contain;
}

.player-status {
  position: absolute;
  top: 16px;
  left: 16px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 11px;
  color: #fff;
  background: rgba(10, 27, 29, 0.76);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 999px;
  font-size: 12px;
  line-height: 1;
  pointer-events: none;
  transition: opacity 240ms ease, transform 240ms ease;
}

.player-status.is-ready {
  opacity: 0;
  transform: translateY(-4px);
}

.player-status.is-error {
  background: rgba(132, 44, 30, 0.88);
}

.status-dot {
  width: 7px;
  height: 7px;
  background: #f6bf4f;
  border-radius: 50%;
}

.is-ready .status-dot {
  background: #79d2a9;
}

.guidance-band {
  margin-top: 76px;
  padding: 52px 0 56px;
  background: var(--ink);
}

.guidance-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  width: min(1180px, calc(100% - 48px));
  margin-inline: auto;
}

.guidance-grid article {
  min-height: 170px;
  padding: 0 38px;
  color: #f7f5ef;
  border-left: 1px solid rgba(255, 255, 255, 0.18);
}

.guidance-grid article:first-child {
  padding-left: 0;
  border-left: 0;
}

.guidance-grid article:last-child {
  padding-right: 0;
}

.section-number {
  display: block;
  margin-bottom: 18px;
  color: #79d2a9;
  font-family: Georgia, serif;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.guidance-grid h2 {
  margin-bottom: 8px;
  font-family: "Songti SC", "SimSun", serif;
  font-size: 25px;
  line-height: 1.3;
}

.guidance-grid p {
  margin-bottom: 0;
  color: rgba(247, 245, 239, 0.72);
  font-size: 14px;
}

.about-band {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(310px, 0.75fr);
  gap: 80px;
  align-items: center;
  padding: 82px 0 86px;
}

.about-copy h2 {
  max-width: 620px;
  margin-bottom: 18px;
  font-family: "Songti SC", "SimSun", serif;
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1.25;
}

.about-copy p {
  max-width: 680px;
  color: var(--muted);
  font-size: 16px;
}

.notice {
  padding-left: 18px;
  border-left: 3px solid var(--coral);
}

.share-panel {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 24px;
  align-items: center;
  padding: 22px;
  background: #fffdf8;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.share-panel img {
  display: block;
  width: 150px;
  height: 150px;
}

.share-panel strong,
.share-panel span {
  display: block;
}

.share-panel strong {
  margin-bottom: 8px;
  font-size: 21px;
}

.share-panel span {
  color: var(--muted);
  font-size: 14px;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  padding: 20px 0 30px;
  color: var(--muted);
  border-top: 1px solid var(--line);
  font-size: 12px;
}

@media (max-width: 820px) {
  .site-header,
  main,
  .site-footer,
  .guidance-grid {
    width: min(100% - 32px, 1180px);
  }

  .site-header {
    min-height: 64px;
  }

  .video-section {
    padding-top: 34px;
  }

  .heading-wrap {
    display: block;
    margin-bottom: 20px;
  }

  h1 {
    margin-bottom: 14px;
    font-size: clamp(35px, 10vw, 54px);
  }

  .player-shell {
    margin-inline: -16px;
    border-radius: 0;
  }

  .player-status {
    top: 10px;
    left: 10px;
  }

  .guidance-band {
    margin-top: 50px;
    padding: 38px 0;
  }

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

  .guidance-grid article,
  .guidance-grid article:first-child,
  .guidance-grid article:last-child {
    min-height: 0;
    padding: 24px 0;
    border-top: 1px solid rgba(255, 255, 255, 0.16);
    border-left: 0;
  }

  .guidance-grid article:first-child {
    padding-top: 0;
    border-top: 0;
  }

  .guidance-grid article:last-child {
    padding-bottom: 0;
  }

  .section-number {
    margin-bottom: 10px;
  }

  .about-band {
    grid-template-columns: 1fr;
    gap: 36px;
    padding: 54px 0 60px;
  }

  .share-panel {
    grid-template-columns: 116px 1fr;
  }

  .share-panel img {
    width: 116px;
    height: 116px;
  }
}

@media (max-width: 420px) {
  .brand {
    font-size: 13px;
  }

  .brand-mark {
    width: 30px;
    height: 30px;
  }

  .duration {
    padding: 5px 9px;
    font-size: 11px;
  }

  .share-panel {
    grid-template-columns: 96px 1fr;
    gap: 18px;
    padding: 16px;
  }

  .share-panel img {
    width: 96px;
    height: 96px;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    scroll-behavior: auto !important;
    transition: none !important;
  }
}