/* ============================================================
   白声机 · 宣传页样式 v2
   设计方向: 清新大自然 · 高清大图沉浸
   配色: 雾奶白 + 苔墨绿 + 森林绿 + 干草金
   结构: 大图 Hero → 亮色叙事 → 大图场景卡 → 瀑布沉浸段
         → 雨夜聆听对比段 → 声库 → 口碑墙
   参考: Calm / Rainy Mood / A Soft Murmur
   ============================================================ */
:root {
  --bg: #f4f0e6;            /* 雾奶白 */
  --bg-alt: #ebe6d8;
  --card: #fbf9f2;
  --ink: #22342a;           /* 苔墨绿 */
  --ink-dim: #55695d;
  --ink-faint: #8d9d90;
  --leaf: #6f9f4f;          /* 森林叶绿 */
  --leaf-deep: #4e7a36;
  --gold: #c9a25a;          /* 干草金 */
  --night: #101b16;         /* 深林夜 */
  --night-2: #16231d;
  --line: rgba(34, 52, 42, .1);
  --line-strong: rgba(34, 52, 42, .16);
  --shadow: 0 24px 60px rgba(34, 52, 42, .14);
  --radius: 26px;
  --serif: "Songti SC", "STSong", "Noto Serif SC", "Source Han Serif SC", serif;
  --sans: -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
h1, h2, h3, b { font-family: var(--serif); font-weight: 600; }

/* ---------- 通用 ---------- */
.eyebrow {
  font-size: 12px;
  letter-spacing: .35em;
  color: var(--leaf);
  text-transform: uppercase;
  margin-bottom: 18px;
  font-weight: 600;
}
.sec-title {
  font-size: clamp(30px, 5vw, 46px);
  margin-bottom: 26px;
  color: var(--ink);
}
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  height: 54px; padding: 0 30px; border-radius: 999px;
  font-size: 15px; letter-spacing: .1em; font-weight: 600;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
}
.btn:active { transform: scale(.97); }
.btn-primary { background: var(--leaf); color: #f6fbf2; box-shadow: 0 10px 26px rgba(111, 159, 79, .35); }
.btn-primary:hover { transform: translateY(-2px); background: var(--leaf-deep); box-shadow: 0 14px 34px rgba(111, 159, 79, .42); }
.btn-ghost { border: 1.5px solid rgba(34, 52, 42, .25); color: var(--ink); background: rgba(244, 240, 230, .55); backdrop-filter: blur(6px); }
.btn-ghost:hover { border-color: var(--leaf); color: var(--leaf-deep); }

/* ============================================================
   Hero · 全屏自然大图
   ============================================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex; flex-direction: column;
  padding: 0 6vw;
  overflow: hidden;
  isolation: isolate;
}
.hero-bg {
  position: absolute; inset: 0; z-index: -2;
  width: 100%; height: 100%;
  object-fit: cover;
}
.hero-veil {
  position: absolute; inset: 0; z-index: -1;
  background:
    linear-gradient(180deg, rgba(244, 240, 230, .78) 0%, rgba(244, 240, 230, .28) 30%, rgba(244, 240, 230, .05) 55%, rgba(244, 240, 230, .94) 96%);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  padding: 24px 0;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark {
  width: 42px; height: 42px; border-radius: 50%;
  background: radial-gradient(circle at 32% 30%, #a9ce8c, #4e7a36 72%);
  color: #f4f9ef; font-family: var(--serif); font-size: 21px;
  display: inline-flex; align-items: center; justify-content: center;
  box-shadow: 0 8px 20px rgba(78, 122, 54, .35);
}
.brand-name { font-family: var(--serif); font-size: 19px; letter-spacing: .2em; color: var(--ink); }
.nav-links { display: flex; gap: 34px; font-size: 14px; color: var(--ink-dim); font-weight: 500; }
.nav-links a { transition: color .2s; letter-spacing: .12em; }
.nav-links a:hover { color: var(--leaf-deep); }

.hero-inner { flex: 1; display: flex; flex-direction: column; justify-content: center; max-width: 1080px; padding: 40px 0 70px; }
.hero-title {
  font-size: clamp(46px, 8vw, 96px);
  line-height: 1.16;
  letter-spacing: .08em;
  color: #16281d;
  font-weight: 700;
  text-shadow:
    0 1px 2px rgba(244, 240, 230, .9),
    0 6px 26px rgba(244, 240, 230, .72);
}
.hero-sub {
  margin-top: 22px; max-width: 520px;
  font-size: clamp(15px, 2vw, 18px); color: #1e3126;
  text-shadow: 0 1px 10px rgba(244, 240, 230, .85);
  font-weight: 600;
}
.hero-cta { display: flex; gap: 18px; margin-top: 36px; flex-wrap: wrap; }

.hero-stats {
  display: flex; gap: clamp(26px, 6vw, 72px);
  margin-top: 56px; padding: 26px 34px;
  background: rgba(244, 240, 230, .72);
  border: 1px solid rgba(34, 52, 42, .08);
  border-radius: var(--radius);
  backdrop-filter: blur(10px);
  box-shadow: 0 18px 48px rgba(34, 52, 42, .12);
  flex-wrap: wrap;
}
.hero-stats dt {
  font-family: var(--serif); font-size: clamp(28px, 4vw, 40px);
  color: var(--leaf-deep); letter-spacing: .02em;
}
.hero-stats dd { font-size: 13px; color: var(--ink-dim); letter-spacing: .08em; }

/* ============================================================
   理念 · 亮色叙事
   ============================================================ */
.idea { padding: 110px 6vw 40px; }
.idea-inner { max-width: 1080px; margin: 0 auto; }
.idea-lead { max-width: 720px; color: var(--ink-dim); font-size: clamp(15px, 2vw, 18px); margin-bottom: 56px; }
.idea-lead em { color: var(--leaf-deep); font-style: normal; font-weight: 600; }

.idea-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px;
}
.idea-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 40px 34px;
  position: relative;
  transition: transform .25s ease, box-shadow .25s ease;
}
.idea-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.card-num {
  font-family: var(--serif); font-size: 14px; letter-spacing: .2em;
  color: var(--gold); display: block; margin-bottom: 22px;
}
.idea-card h3 { font-size: 24px; margin-bottom: 14px; color: var(--ink); }
.idea-card p { color: var(--ink-dim); font-size: 14px; }

/* 实地采声大图带 */
.field-band {
  max-width: 1240px; margin: 90px auto 0;
  display: grid; grid-template-columns: 1.2fr 1fr;
  border-radius: 34px; overflow: hidden;
  background: var(--card);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.field-band img { width: 100%; height: 100%; min-height: 320px; object-fit: cover; }
.field-band figcaption {
  padding: clamp(30px, 4vw, 60px);
  display: flex; flex-direction: column; justify-content: center;
}
.field-chip {
  align-self: flex-start;
  font-size: 11px; letter-spacing: .3em;
  color: var(--leaf-deep); background: rgba(111, 159, 79, .12);
  padding: 7px 14px; border-radius: 999px;
  margin-bottom: 22px; font-weight: 600;
}
.field-band figcaption b { font-size: clamp(24px, 3vw, 34px); line-height: 1.4; margin-bottom: 16px; color: var(--ink); }
.field-band figcaption p { color: var(--ink-dim); font-size: 15px; }

/* ============================================================
   场景 · 大图卡片
   ============================================================ */
.scenes { padding: 110px 6vw 20px; }
.scenes-inner { max-width: 1240px; margin: 0 auto; }
.scene-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px;
}
.scene-cell {
  position: relative;
  aspect-ratio: 4 / 4.6;
  border-radius: 30px; overflow: hidden;
  cursor: pointer;
  border: none; text-align: left; color: #fff;
  background-size: cover; background-position: center;
  box-shadow: 0 18px 44px rgba(34, 52, 42, .18);
  transition: transform .28s ease, box-shadow .28s ease;
  display: flex; align-items: flex-end;
  padding: 0;
}
.scene-cell:hover {
  transform: translateY(-8px) scale(1.01);
  box-shadow: 0 30px 64px rgba(34, 52, 42, .26);
}
.scene-cell::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(16, 27, 22, 0) 40%, rgba(16, 27, 22, .72) 100%);
}
.scene-cell .scene-info {
  position: relative; z-index: 1;
  padding: 26px 26px 30px;
  width: 100%;
}
.scene-ico { font-size: 30px; display: block; margin-bottom: 10px; filter: drop-shadow(0 2px 8px rgba(0,0,0,.4)); }
.scene-cell h3 { font-size: 26px; margin-bottom: 6px; letter-spacing: .05em; }
.scene-cell p { font-size: 14px; opacity: .88; letter-spacing: .04em; }

/* ============================================================
   中段 · 瀑布大图叙事
   ============================================================ */
.zen-band {
  position: relative; min-height: 66vh;
  margin-top: 120px;
  display: flex; align-items: center;
  isolation: isolate;
  overflow: hidden;
}
.zen-bg { position: absolute; inset: 0; z-index: -2; width: 100%; height: 100%; object-fit: cover; }
.zen-veil {
  position: absolute; inset: 0; z-index: -1;
  background: linear-gradient(90deg, rgba(16, 27, 22, .82) 0%, rgba(16, 27, 22, .45) 55%, rgba(16, 27, 22, .2) 100%);
}
.zen-inner { max-width: 1080px; margin: 0 auto; width: 100%; padding: 120px 6vw; }
.zen-eyebrow { color: #d7e4c9; }
.zen-title { font-size: clamp(34px, 6vw, 64px); color: #eef4e6; line-height: 1.25; margin-bottom: 22px; letter-spacing: .06em; }
.zen-text { max-width: 520px; color: rgba(238, 244, 230, .85); font-size: 16px; }

/* ============================================================
   聆听体验 · 雨夜沉浸对比段
   ============================================================ */
.experience {
  position: relative;
  padding: 130px 6vw;
  color: #e8efe1;
  isolation: isolate;
  overflow: hidden;
}
.exp-bg { position: absolute; inset: 0; z-index: -2; width: 100%; height: 100%; object-fit: cover; }
.exp-veil {
  position: absolute; inset: 0; z-index: -1;
  background: linear-gradient(180deg, rgba(16, 27, 22, .82), rgba(16, 27, 22, .78) 60%, rgba(16, 27, 22, .9));
}
.experience-inner { max-width: 1080px; margin: 0 auto; }
.experience .eyebrow { color: #d7e4c9; }
.experience .sec-title { color: #eef4e6; }

.player-overview {
  display: grid; grid-template-columns: 1.15fr 1fr; gap: 40px; align-items: center;
  margin-top: 40px;
}
.player-panel {
  background: rgba(24, 37, 30, .55);
  border: 1px solid rgba(236, 244, 226, .16);
  border-radius: 34px;
  padding: 48px 40px;
  backdrop-filter: blur(14px);
  box-shadow: 0 30px 70px rgba(0,0,0,.35);
  position: relative;
}
.wave {
  display: flex; align-items: center; justify-content: center; gap: 7px;
  height: 66px; margin-bottom: 30px;
}
.wave i {
  width: 5px; height: 14px; border-radius: 99px;
  background: #9fc47e;
  transition: height .18s ease;
}
.wave.playing i { animation: bounce 1s ease-in-out infinite; }
.wave.playing i:nth-child(2n) { animation-delay: .15s; }
.wave.playing i:nth-child(3n) { animation-delay: .3s; }
.wave.playing i:nth-child(5n) { animation-delay: .45s; }
@keyframes bounce {
  0%, 100% { height: 14px; }
  50% { height: 54px; }
}
.now-playing { margin-bottom: 34px; text-align: center; }
.np-name { display: block; font-family: var(--serif); font-size: 26px; letter-spacing: .04em; color: #f2f6e8; margin-bottom: 6px; }
.np-detail { font-size: 13px; color: rgba(236, 244, 226, .6); letter-spacing: .1em; }
.play-btn, .close-btn {
  border: none; cursor: pointer; font-size: 16px;
  display: inline-flex; align-items: center; justify-content: center;
  transition: transform .15s ease;
}
.play-btn {
  width: 84px; height: 84px; border-radius: 50%;
  background: radial-gradient(circle at 34% 30%, #b7d69a, #6f9f4f 70%);
  color: #14200f; font-size: 26px;
  box-shadow: 0 14px 36px rgba(151, 198, 122, .4);
  display: flex; margin: 0 auto 0; justify-content: center;
}
.play-btn:hover { transform: scale(1.06); }
.close-btn {
  position: absolute; top: 22px; right: 22px;
  width: 40px; height: 40px; border-radius: 50%;
  background: rgba(236, 244, 226, .12); color: rgba(236, 244, 226, .8);
}
.close-btn:hover { transform: rotate(90deg); }

.feature-list { display: flex; flex-direction: column; gap: 22px; }
.feat {
  display: flex; gap: 18px; align-items: flex-start;
  background: rgba(24, 37, 30, .42);
  border: 1px solid rgba(236, 244, 226, .12);
  border-radius: 22px; padding: 24px 26px;
  backdrop-filter: blur(8px);
}
.feat-ico { font-size: 22px; color: #b7d69a; line-height: 1.4; }
.feat h4 { font-size: 17px; color: #f2f6e8; margin-bottom: 4px; letter-spacing: .04em; }
.feat p { font-size: 13px; color: rgba(236, 244, 226, .6); }

/* ============================================================
   声库
   ============================================================ */
.library { padding: 110px 6vw 90px; }
.library-inner { max-width: 1240px; margin: 0 auto; }
.cat-filter { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 34px; }
.cat-chip {
  border: 1px solid var(--line-strong); background: var(--card);
  color: var(--ink-dim); border-radius: 999px;
  padding: 9px 20px; font-size: 13px; letter-spacing: .06em; cursor: pointer;
  transition: all .18s ease;
}
.cat-chip:hover { border-color: var(--leaf); color: var(--leaf-deep); }
.cat-chip.on { background: var(--leaf); border-color: var(--leaf); color: #f4f9ef; }
.sound-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 16px;
}
.sound-cell {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 20px 20px 18px;
  cursor: pointer; text-align: left;
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
  display: flex; flex-direction: column; gap: 6px;
}
.sound-cell:hover { transform: translateY(-4px); box-shadow: 0 16px 36px rgba(34, 52, 42, .14); border-color: rgba(111, 159, 79, .4); }
.sound-cell strong { font-family: var(--serif); font-size: 17px; color: var(--ink); letter-spacing: .03em; }
.sound-cell span { font-size: 12px; color: var(--ink-faint); }
.sound-cell .s-dur { font-style: normal; color: var(--leaf-deep); }
.sound-cell.playing { background: rgba(111, 159, 79, .14); border-color: var(--leaf); }
.library-note { text-align: center; margin-top: 36px; color: var(--ink-faint); font-size: 13px; letter-spacing: .1em; }

/* ============================================================
   口碑
   ============================================================ */
.voices { padding: 40px 6vw 120px; }
.voices-inner { max-width: 1240px; margin: 0 auto; }
.voices-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.voice {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 26px;
  padding: 34px 30px;
  font-style: normal;
}
.voice p { font-family: var(--serif); font-size: 16px; line-height: 1.9; color: var(--ink); margin-bottom: 22px; }
.voice cite { font-size: 12px; color: var(--ink-faint); letter-spacing: .08em; font-style: normal; }

/* ============================================================
   Footer
   ============================================================ */
.footer {
  background: linear-gradient(180deg, #16231d, #101b16);
  color: rgba(236, 244, 226, .8);
  text-align: center; padding: 70px 6vw 80px;
}
.footer-brand { justify-content: center; margin-bottom: 18px; }
.footer .brand-name { color: #eef4e6; }
.footer p { font-size: 14px; letter-spacing: .1em; margin-bottom: 12px; }
.footer .footer-legal { font-size: 11px; color: rgba(236, 244, 226, .45); max-width: 640px; margin: 18px auto 30px; line-height: 1.8; }
.back-top {
  display: inline-block;
  border: 1px solid rgba(236, 244, 226, .25);
  border-radius: 999px; padding: 10px 24px;
  font-size: 13px; letter-spacing: .1em;
  transition: all .18s ease;
}
.back-top:hover { background: rgba(236, 244, 226, .1); }

/* ============================================================
   入场动效
   ============================================================ */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 900px) {
  .idea-grid, .scene-grid, .voices-grid { grid-template-columns: repeat(2, 1fr); }
  .field-band { grid-template-columns: 1fr; }
  .player-overview { grid-template-columns: 1fr; }
}
@media (max-width: 620px) {
  .idea-grid, .scene-grid, .voices-grid { grid-template-columns: 1fr; }
  .nav-links { display: none; }
  .hero-stats { gap: 22px; }
}