:root {
  --bg: #d7e4e8;
  --ink: #10242b;
  --mute: #4d676f;
  --line: #9bb4ba;
  --teal: #0f766e;
  --teal-2: #115e59;
  --paper: #f4f8f9;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  background:
    radial-gradient(700px 380px at 100% 0%, rgba(15, 118, 110, 0.16), transparent 55%),
    linear-gradient(180deg, #e7f1f3 0%, var(--bg) 40%, #cfdde1 100%);
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }

.w {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

.top {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(231, 241, 243, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.top-in {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 60px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}
.brand img { width: 40px; height: 40px; border-radius: 10px; }
.brand strong { display: block; font-size: 16px; font-weight: 900; }
.brand em {
  display: block;
  font-style: normal;
  font-size: 11px;
  color: var(--mute);
}
.get {
  background: var(--teal);
  color: #fff;
  font-weight: 800;
  font-size: 13px;
  padding: 9px 14px;
}

.head { margin-bottom: 24px; max-width: 560px; }
.head h2 {
  margin: 0 0 8px;
  font-family: Syne, "Noto Sans SC", sans-serif;
  font-size: clamp(26px, 3.4vw, 36px);
  font-weight: 800;
}
.head p {
  margin: 0;
  color: var(--mute);
  font-size: 15px;
  line-height: 1.75;
}

.btn-go,
.btn-line {
  display: inline-flex;
  align-items: center;
  padding: 12px 20px;
  font-size: 14px;
  font-weight: 800;
}
.btn-go { background: var(--teal); color: #fff; }
.btn-go:hover { background: var(--teal-2); }
.btn-line {
  border: 1px solid var(--ink);
  background: transparent;
}
.btn-line:hover { background: #fff; }

.open {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 32px;
  align-items: center;
  min-height: calc(100vh - 60px);
  max-height: 900px;
  padding: 36px 0 44px;
}
.open-copy { display: flex; flex-direction: column; justify-content: center; }
.eye {
  margin: 0 0 8px;
  color: var(--teal);
  font-weight: 800;
  letter-spacing: 0.12em;
  font-size: 13px;
}
.open h1 {
  margin: 0;
  font-family: Syne, "Noto Sans SC", sans-serif;
  font-size: clamp(52px, 8vw, 84px);
  font-weight: 800;
  line-height: 0.95;
}
.line {
  margin: 12px 0 0;
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 800;
  line-height: 1.25;
}
.line span {
  color: var(--teal);
  border-bottom: 3px solid rgba(15, 118, 110, 0.35);
}
.lead {
  margin: 16px 0 0;
  color: var(--mute);
  font-size: 15px;
  line-height: 1.8;
}
.acts { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 24px; }

.open-fig {
  margin: 0;
  background: #0e1a1c;
  border: 1px solid var(--ink);
  align-self: center;
  line-height: 0;
}
.open-fig img {
  width: 100%;
  height: auto;
  max-height: min(560px, calc(100vh - 140px));
  object-fit: contain;
  object-position: center top;
  display: block;
}

.shelf, .path, .play, .voice, .faq, .down {
  padding: 56px 0;
  border-top: 1px solid var(--line);
}

.shelf-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 12px;
  align-items: stretch;
}
.shelf-grid figure {
  margin: 0;
  background: var(--paper);
  border: 1px solid var(--ink);
  padding: 8px;
  display: flex;
  flex-direction: column;
}
.shelf-grid img {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: contain;
  object-position: center top;
  background: #0e1a1c;
  cursor: zoom-in;
}
.shelf-grid figcaption {
  padding: 10px 2px 4px;
  min-height: 52px;
}
.shelf-grid b { display: block; font-size: 14px; }
.shelf-grid span { font-size: 12px; color: var(--mute); }

.path-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}
.path-grid article {
  background: var(--paper);
  border: 1px solid var(--ink);
  border-top: 6px solid var(--teal);
  padding: 20px 18px;
}
.path-grid em {
  font-style: normal;
  font-family: Syne, sans-serif;
  font-size: 28px;
  color: var(--teal);
}
.path-grid h3 { margin: 8px 0; font-size: 18px; }
.path-grid p { margin: 0; color: var(--mute); font-size: 14px; line-height: 1.75; }

.play-grid {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 28px;
  align-items: center;
}
.play-grid figure {
  margin: 0;
  border: 1px solid var(--ink);
  background: var(--paper);
  padding: 8px;
}
.play-grid img { width: 100%; height: auto; object-fit: contain; cursor: zoom-in; }
.play-copy h3 { margin: 0 0 10px; font-size: 22px; }
.play-copy p { margin: 0 0 14px; color: var(--mute); font-size: 15px; line-height: 1.75; }
.play-copy ul { margin: 0; padding-left: 18px; color: var(--ink); font-size: 14px; line-height: 1.8; }

.voice-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.voice-grid article {
  background: var(--paper);
  border: 1px solid var(--ink);
  border-left: 4px solid var(--teal);
  padding: 16px;
}
.voice-grid header {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
  font-size: 13px;
}
.voice-grid time { color: var(--mute); font-size: 12px; }
.voice-grid p { margin: 0; font-size: 14px; line-height: 1.75; }

.faq-list {
  border: 1px solid var(--ink);
  background: var(--paper);
  max-width: 820px;
}
.faq-list details { border-bottom: 1px solid var(--line); }
.faq-list details:last-child { border-bottom: 0; }
.faq-list summary {
  cursor: pointer;
  list-style: none;
  padding: 14px 16px;
  font-weight: 800;
}
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list details[open] summary { color: var(--teal); }
.faq-list p {
  margin: 0;
  padding: 0 16px 14px;
  color: var(--mute);
  font-size: 14px;
  line-height: 1.75;
}

.down-box {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 22px;
  align-items: stretch;
  background: var(--paper);
  border: 1px solid var(--ink);
  padding: 16px;
}
.down-box figure { margin: 0; }
.down-box img { width: 100%; height: auto; object-fit: contain; }
.down-packs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.down-packs article {
  border: 1px solid var(--ink);
  padding: 16px;
  display: flex;
  flex-direction: column;
}
.down-box h3 { margin: 0 0 8px; }
.down-box p { margin: 0 0 16px; color: var(--mute); line-height: 1.75; font-size: 14px; }
.down-packs .btn-go,
.down-packs .btn-line { align-self: flex-start; margin-top: auto; }

.foot {
  border-top: 1px solid var(--ink);
  padding: 24px 0 96px;
  font-size: 12px;
  color: var(--mute);
}
.foot p { margin: 0 0 6px; }

.dock {
  position: fixed;
  right: 16px;
  bottom: 16px;
  z-index: 30;
  background: var(--teal);
  color: #fff;
  font-weight: 900;
  padding: 12px 16px;
  font-size: 13px;
}

.glass {
  position: fixed;
  inset: 0;
  z-index: 40;
  background: rgba(16, 36, 43, 0.92);
  display: grid;
  place-items: center;
  padding: 20px;
}
.glass[hidden] { display: none; }
.glass img {
  max-width: min(92vw, 480px);
  max-height: 86vh;
  width: auto;
  height: auto;
  object-fit: contain;
}
.glass button {
  position: absolute;
  top: 16px;
  right: 16px;
  border: 1px solid #fff;
  background: transparent;
  color: #fff;
  padding: 8px 12px;
}

@media (max-width: 960px) {
  .open {
    grid-template-columns: 1fr;
    min-height: auto;
    max-height: none;
  }
  .open-fig img { max-height: 420px; }
  .shelf-grid { grid-template-columns: repeat(3, 1fr); }
  .path-grid, .play-grid, .voice-grid, .down-box, .down-packs { grid-template-columns: 1fr; }
  .play-grid figure, .down-box figure { max-width: 280px; }
}

@media (max-width: 640px) {
  .shelf-grid { grid-template-columns: 1fr 1fr; }
  .open h1 { font-size: clamp(44px, 16vw, 64px); }
}