/* ============================================================
   林音 · 官网样式
   设计语言：来自森林的自然薄荷绿 × 苹果式克制高级感
   ============================================================ */

/* ---------- 设计令牌 ---------- */
:root {
  /* 品牌色（源自 Logo：青绿 + 黄喙） */
  --mint:        #3CC79A;
  --mint-deep:   #1F9C77;
  --mint-soft:   #EAF8F2;
  --teal:        #1F5C4E;
  --teal-deep:   #0E2B26;
  --sun:         #FFC94D;

  /* 文字 */
  --ink:         #0E2B26;
  --ink-2:       #2E4A43;
  --ink-3:       #5C726A;

  /* 背景 */
  --bg:          #FFFFFF;
  --bg-soft:     #F4FAF7;

  /* 圆角 */
  --r-btn: 999px;
  --r-card: 24px;
  --r-lg: 32px;
  --r-phone: 46px;

  /* 阴影 */
  --shadow-1: 0 1px 2px rgba(14,43,38,.05), 0 8px 24px rgba(14,43,38,.06);
  --shadow-2: 0 4px 12px rgba(14,43,38,.07), 0 20px 48px rgba(14,43,38,.10);
  --shadow-mint: 0 12px 34px rgba(31,156,119,.28);

  /* 字体 */
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text",
          "PingFang SC", "Helvetica Neue", "Microsoft YaHei", sans-serif;

  /* 版心 */
  --maxw: 1180px;
}

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

html { scroll-behavior: smooth; scroll-padding-top: 84px; }

body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { display: block; max-width: 100%; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }

.container { width: min(100% - 48px, var(--maxw)); margin-inline: auto; }

/* ---------- 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 30px;
  border-radius: var(--r-btn);
  font-size: 16px;
  font-weight: 600;
  line-height: 1;
  cursor: pointer;
  border: none;
  transition: transform .35s cubic-bezier(.2,.7,.3,1.2), box-shadow .35s ease, background .3s ease;
  white-space: nowrap;
}
.btn-primary {
  background: linear-gradient(135deg, #3CC79A 0%, #1F9C77 100%);
  color: #fff;
  box-shadow: var(--shadow-mint);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 18px 40px rgba(31,156,119,.36); }
.btn-ghost {
  background: rgba(255,255,255,.7);
  color: var(--teal-deep);
  border: 1.5px solid rgba(14,43,38,.14);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.btn-ghost:hover { background: #fff; border-color: rgba(14,43,38,.28); transform: translateY(-2px); }
.btn-sm { padding: 10px 20px; font-size: 14px; }

/* ============================================================
   导航栏
   ============================================================ */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  transition: background .4s ease, box-shadow .4s ease, backdrop-filter .4s ease;
}
.nav.scrolled {
  background: rgba(255,255,255,.82);
  backdrop-filter: blur(18px) saturate(180%);
  -webkit-backdrop-filter: blur(18px) saturate(180%);
  box-shadow: 0 1px 0 rgba(14,43,38,.06), 0 8px 28px rgba(14,43,38,.06);
}
.nav-inner {
  width: min(100% - 48px, var(--maxw));
  margin-inline: auto;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand-logo { width: 38px; height: 38px; border-radius: 11px; box-shadow: 0 2px 8px rgba(31,156,119,.22); }
.brand-name { font-size: 21px; font-weight: 700; letter-spacing: .02em; color: var(--teal-deep); }
.nav-links { display: flex; gap: 36px; }
.nav-link {
  font-size: 15px;
  font-weight: 500;
  color: var(--ink-2);
  position: relative;
  padding: 6px 0;
  transition: color .3s ease;
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 100%; height: 2px;
  border-radius: 2px;
  background: var(--mint);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .35s ease;
}
.nav-link:hover { color: var(--teal-deep); }
.nav-link:hover::after { transform: scaleX(1); }
.nav-right { display: flex; align-items: center; gap: 14px; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px; height: 44px;
  background: none; border: none;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  width: 22px; height: 2px;
  margin-inline: auto;
  background: var(--teal-deep);
  border-radius: 2px;
  transition: transform .35s ease, opacity .3s ease;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============================================================
   首屏 Hero
   ============================================================ */
.hero { position: relative; min-height: 100vh; display: flex; align-items: center; padding: 120px 0 80px; }
.hero-bg { position: absolute; inset: 0; overflow: hidden; }
.hero-bg img { width: 100%; height: 100%; object-fit: cover; }
.hero-overlay {
  position: absolute; inset: 0;
  background:
    linear-gradient(180deg, rgba(255,255,255,.92) 0%, rgba(244,250,247,.72) 40%, rgba(234,248,242,.62) 100%),
    linear-gradient(90deg, rgba(255,255,255,.55) 0%, rgba(255,255,255,0) 55%);
}
.hero-inner {
  position: relative;
  z-index: 2;
  width: min(100% - 48px, var(--maxw));
  margin-inline: auto;
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  align-items: center;
  gap: 48px;
}

/* 左文案 */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 8px 16px;
  border-radius: var(--r-btn);
  background: rgba(255,255,255,.7);
  border: 1px solid rgba(31,156,119,.22);
  color: var(--mint-deep);
  font-size: 13.5px;
  font-weight: 600;
  letter-spacing: .04em;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.badge .dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--mint);
  box-shadow: 0 0 0 4px rgba(60,199,154,.18);
  animation: pulse 2.2s ease-in-out infinite;
}
@keyframes pulse {
  0%,100% { box-shadow: 0 0 0 3px rgba(60,199,154,.18); }
  50%     { box-shadow: 0 0 0 7px rgba(60,199,154,.05); }
}
.hero h1 {
  margin-top: 26px;
  font-size: clamp(42px, 5.6vw, 68px);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -.02em;
  color: var(--teal-deep);
}
.hero h1 em {
  font-style: normal;
  background: linear-gradient(120deg, #1F9C77 0%, #3CC79A 45%, #8FE3C4 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.lead {
  margin-top: 24px;
  font-size: 18px;
  line-height: 1.8;
  color: var(--ink-2);
  max-width: 480px;
}
.hero-cta { display: flex; gap: 16px; margin-top: 34px; flex-wrap: wrap; }
.hero-points {
  display: flex;
  gap: 24px;
  margin-top: 32px;
  color: var(--ink-3);
  font-size: 14px;
  font-weight: 500;
}
.hero-points li { display: flex; align-items: center; gap: 8px; }
.hero-points li::before {
  content: "";
  width: 5px; height: 5px; border-radius: 50%;
  background: var(--mint);
}

/* 右手机 */
.hero-phone { position: relative; display: flex; justify-content: center; }

.phone {
  width: min(330px, 84vw);
  aspect-ratio: 9 / 18.6;
  padding: 12px;
  border-radius: calc(var(--r-phone) + 8px);
  background: linear-gradient(160deg, #DFF3EA, #B8E6D4 55%, #8FD9C0);
  box-shadow:
    inset 0 0 0 1.5px rgba(255,255,255,.55),
    0 30px 70px rgba(14,43,38,.22),
    0 12px 30px rgba(14,43,38,.14);
  animation: floaty 6.5s ease-in-out infinite;
}
@keyframes floaty {
  0%,100% { transform: translateY(0) rotate(0deg); }
  50%     { transform: translateY(-14px) rotate(-.6deg); }
}
.phone-frame {
  width: 100%; height: 100%;
  border-radius: var(--r-phone);
  background: #fff;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: inset 0 0 0 1px rgba(14,43,38,.05);
}

/* 状态栏 */
.status-bar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 18px 6px;
  font-size: 12px; font-weight: 600;
  color: var(--teal-deep);
  background: #fff;
}
.sb-icons { letter-spacing: .5px; font-size: 11px; }

/* 聊天头部 */
.chat-header {
  display: flex; align-items: center; gap: 11px;
  padding: 10px 14px 12px;
  border-bottom: 1px solid rgba(14,43,38,.06);
  background: rgba(250,253,251,.92);
}
.ch-avatar { width: 34px; height: 34px; border-radius: 10px; }
.ch-info { display: flex; flex-direction: column; line-height: 1.25; }
.ch-name { font-size: 13.5px; font-weight: 700; color: var(--teal-deep); }
.ch-status { font-size: 10.5px; color: var(--mint-deep); display: flex; align-items: center; gap: 4px; }
.online-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--mint); }
.ch-more { margin-left: auto; color: var(--ink-3); letter-spacing: 1px; font-weight: 700; }

/* 聊天内容 */
.chat-body {
  flex: 1;
  padding: 16px 12px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: linear-gradient(180deg, #F7FCFA 0%, #F0F9F5 100%);
  overflow: hidden;
}
.msg { display: flex; align-items: flex-end; gap: 8px; animation: msgIn .5s ease both; }
.msg:nth-child(2) { animation-delay: .15s; }
.msg:nth-child(3) { animation-delay: .3s; }
.msg:nth-child(4) { animation-delay: .45s; }
.msg:nth-child(5) { animation-delay: .6s; }
.msg:nth-child(6) { animation-delay: .75s; }
@keyframes msgIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }
.row-in  { justify-content: flex-start; }
.row-out { justify-content: flex-end; }
.msg-avatar { width: 26px; height: 26px; border-radius: 8px; flex-shrink: 0; }
.bubble {
  max-width: 78%;
  padding: 10px 14px;
  font-size: 12.5px;
  line-height: 1.55;
  border-radius: 16px;
}
.bubble.in  { background: #fff; color: var(--ink-2); border: 1px solid rgba(14,43,38,.06); border-bottom-left-radius: 5px; box-shadow: 0 2px 6px rgba(14,43,38,.05); }
.bubble.out { background: linear-gradient(135deg, #3CC79A, #1F9C77); color: #fff; border-bottom-right-radius: 5px; box-shadow: 0 4px 12px rgba(31,156,119,.25); }

/* 语音气泡 */
.bubble.voice { display: flex; align-items: center; gap: 10px; padding: 11px 15px; }
.wave { display: flex; align-items: center; gap: 3px; height: 22px; }
.wave i {
  width: 3.5px;
  border-radius: 3px;
  background: currentColor;
  opacity: .9;
  animation: wv 1.1s ease-in-out infinite;
}
.wave i:nth-child(1){ animation-delay: 0s;   }
.wave i:nth-child(2){ animation-delay: .12s; }
.wave i:nth-child(3){ animation-delay: .24s; }
.wave i:nth-child(4){ animation-delay: .36s; }
.wave i:nth-child(5){ animation-delay: .05s; }
.wave i:nth-child(6){ animation-delay: .2s;  }
.wave i:nth-child(7){ animation-delay: .32s; }
.wave i:nth-child(8){ animation-delay: .42s; }
@keyframes wv {
  0%,100% { height: 5px; }
  50%     { height: 20px; }
}
.bubble.in.voice  { color: var(--mint-deep); }
.bubble.out.voice { color: #fff; }
.dur { font-size: 11px; font-weight: 600; opacity: .85; }

/* 正在输入 */
.typing { animation-delay: .9s; }
.typing-bubble {
  display: flex; align-items: center; gap: 4px;
  padding: 12px 15px;
  background: #fff;
  border: 1px solid rgba(14,43,38,.06);
  border-radius: 16px;
  border-bottom-left-radius: 5px;
}
.typing-bubble i {
  width: 5px; height: 5px; border-radius: 50%;
  background: var(--mint-deep);
  animation: ty 1.2s ease-in-out infinite;
}
.typing-bubble i:nth-child(2){ animation-delay: .15s; }
.typing-bubble i:nth-child(3){ animation-delay: .3s; }
@keyframes ty { 0%,100% { opacity: .3; transform: translateY(0); } 50% { opacity: 1; transform: translateY(-3px); } }

/* 输入栏 */
.chat-input {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 14px;
  background: #fff;
  border-top: 1px solid rgba(14,43,38,.06);
}
.ci-plus { color: var(--ink-3); font-size: 16px; }
.ci-field {
  flex: 1;
  font-size: 12px;
  color: var(--ink-3);
  background: var(--mint-soft);
  padding: 8px 12px;
  border-radius: 999px;
}
.ci-mic {
  width: 30px; height: 30px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, #3CC79A, #1F9C77);
  color: #fff; font-size: 13px;
  border-radius: 50%;
  box-shadow: 0 3px 8px rgba(31,156,119,.3);
}
.ci-mic svg { width: 15px; height: 15px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }

/* 悬浮卡片 */
.float-card {
  position: absolute;
  display: flex; align-items: center; gap: 10px;
  padding: 11px 16px;
  border-radius: 18px;
  background: rgba(255,255,255,.78);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid rgba(255,255,255,.7);
  box-shadow: var(--shadow-2);
  z-index: 5;
}
.fc-a { top: 8%; left: -4%; animation: drift 7s ease-in-out infinite; }
.fc-b { bottom: 14%; right: -6%; animation: drift 8s ease-in-out infinite reverse; }
@keyframes drift { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }
.fc-ico {
  width: 34px; height: 34px;
  display: grid; place-items: center;
  border-radius: 11px;
  background: linear-gradient(135deg, #3CC79A, #1F9C77);
  color: #fff; font-size: 16px;
}
.fc-ico svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.fc-leaf { background: linear-gradient(135deg, #FFD977, #FFC94D); color: #7a5a00; }
.fc-text { display: flex; flex-direction: column; line-height: 1.3; }
.fc-title { font-size: 12.5px; font-weight: 700; color: var(--teal-deep); white-space: nowrap; }
.fc-meta { font-size: 10.5px; color: var(--ink-3); white-space: nowrap; }

/* 首屏底部渐隐 */
.hero-fade {
  position: absolute; left: 0; right: 0; bottom: 0; height: 90px;
  background: linear-gradient(180deg, rgba(255,255,255,0), rgba(255,255,255,1));
  z-index: 3;
}

/* ============================================================
   三大承诺
   ============================================================ */
.promises { padding: 64px 0 40px; background: #fff; }
.promise-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.promise {
  padding: 34px 30px;
  border-radius: var(--r-card);
  background: var(--bg-soft);
  border: 1px solid rgba(14,43,38,.05);
  transition: transform .4s ease, box-shadow .4s ease;
}
.promise:hover { transform: translateY(-6px); box-shadow: var(--shadow-2); }
.promise .pi { width: 34px; height: 34px; fill: none; stroke: var(--mint-deep); stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; margin-bottom: 18px; }
.promise h3 { font-size: 19px; font-weight: 700; margin-bottom: 8px; color: var(--teal-deep); }
.promise p { font-size: 14.5px; color: var(--ink-3); line-height: 1.7; }

/* ============================================================
   功能特性
   ============================================================ */
.features { padding: 96px 0; background: var(--bg); }
.sec-head { text-align: center; max-width: 640px; margin: 0 auto 56px; }
.sec-tag {
  display: inline-block;
  font-size: 13px; font-weight: 700; letter-spacing: .1em;
  color: var(--mint-deep);
  background: var(--mint-soft);
  padding: 6px 14px;
  border-radius: var(--r-btn);
  margin-bottom: 18px;
}
.sec-head h2 { font-size: clamp(32px, 4vw, 44px); font-weight: 800; letter-spacing: -.01em; color: var(--teal-deep); line-height: 1.2; }
.sec-head p { margin-top: 14px; font-size: 17px; color: var(--ink-3); }

.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.feature {
  padding: 34px 28px;
  border-radius: var(--r-card);
  background: #fff;
  border: 1px solid rgba(14,43,38,.07);
  transition: transform .4s ease, box-shadow .4s ease, border-color .4s ease;
  position: relative;
  overflow: hidden;
}
.feature::before {
  content: "";
  position: absolute; top: 0; left: 0; right: 0; height: 4px;
  background: linear-gradient(90deg, #3CC79A, #8FE3C4);
  opacity: 0; transition: opacity .4s ease;
}
.feature:hover { transform: translateY(-6px); box-shadow: var(--shadow-2); border-color: rgba(60,199,154,.3); }
.feature:hover::before { opacity: 1; }
.f-ico {
  display: grid; place-items: center;
  width: 54px; height: 54px;
  border-radius: 16px;
  background: var(--mint-soft);
  margin-bottom: 22px;
  transition: transform .4s ease;
}
.feature:hover .f-ico { transform: scale(1.06) rotate(-3deg); }
.f-ico svg { width: 26px; height: 26px; fill: none; stroke: var(--mint-deep); stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.feature h3 { font-size: 19px; font-weight: 700; margin-bottom: 10px; color: var(--teal-deep); }
.feature p { font-size: 14.5px; color: var(--ink-3); line-height: 1.75; }

/* ============================================================
   设计展示
   ============================================================ */
.design { padding: 96px 0; background: var(--bg-soft); }
.design-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 64px;
}
.design-copy h2 { font-size: clamp(30px, 3.6vw, 42px); font-weight: 800; letter-spacing: -.01em; color: var(--teal-deep); line-height: 1.22; margin-bottom: 20px; }
.design-copy > p { font-size: 16.5px; color: var(--ink-2); line-height: 1.8; max-width: 480px; }
.design-list { margin-top: 28px; display: flex; flex-direction: column; gap: 14px; }
.design-list li { display: flex; align-items: center; gap: 12px; font-size: 15px; color: var(--ink-2); font-weight: 500; }
.design-list i { color: var(--mint-deep); font-style: normal; font-size: 17px; }
.design-list .dl-check { display: grid; place-items: center; width: 20px; height: 20px; }
.design-list .dl-check svg { width: 16px; height: 16px; fill: none; stroke: var(--mint-deep); stroke-width: 2.2; stroke-linecap: round; stroke-linejoin: round; }

.design-visual {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.design-card {
  display: flex; align-items: center; gap: 14px;
  background: #fff;
  border-radius: 20px;
  padding: 20px;
  box-shadow: var(--shadow-1);
  border: 1px solid rgba(14,43,38,.05);
  transition: transform .4s ease, box-shadow .4s ease;
}
.design-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-2); }
.dc-swatch { width: 44px; height: 44px; border-radius: 14px; flex-shrink: 0; }
.dc-swatch.mint  { background: linear-gradient(135deg, #8FE3C4, #3CC79A); }
.dc-swatch.teal  { background: linear-gradient(135deg, #2E7A66, #1F5C4E); }
.dc-swatch.sun   { background: linear-gradient(135deg, #FFE29A, #FFC94D); }
.dc-swatch.night { background: linear-gradient(135deg, #1C4A41, #0E2B26); }
.dc-info { display: flex; flex-direction: column; line-height: 1.35; }
.dc-info b { font-size: 15px; color: var(--teal-deep); }
.dc-info i { font-style: normal; font-size: 12.5px; color: var(--ink-3); }
.design-card:nth-child(2) { transform: translateY(22px); }
.design-card:nth-child(2):hover { transform: translateY(18px); }
.design-card:nth-child(3) { transform: translateY(10px); }
.design-card:nth-child(3):hover { transform: translateY(6px); }

.design-panel {
  grid-column: 1 / -1;
  margin-top: 12px;
  background: var(--teal-deep);
  border-radius: 24px;
  padding: 26px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
}
.dp-chip {
  font-size: 13px; font-weight: 600;
  color: #DFF3EA;
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.14);
  padding: 7px 14px;
  border-radius: var(--r-btn);
}
.dp-wave { display: flex; align-items: center; gap: 4px; height: 28px; }
.dp-wave i {
  width: 4px; border-radius: 4px;
  background: linear-gradient(180deg, #3CC79A, #8FE3C4);
  animation: wv 1.3s ease-in-out infinite;
}
.dp-wave i:nth-child(2n){ animation-delay: .2s; }
.dp-wave i:nth-child(3n){ animation-delay: .4s; }

/* ============================================================
   品牌故事
   ============================================================ */
.story { position: relative; padding: 120px 0; overflow: hidden; }
.story-bg { position: absolute; inset: 0; }
.story-bg img { width: 100%; height: 100%; object-fit: cover; }
.story-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(90deg, rgba(14,43,38,.72) 0%, rgba(14,43,38,.30) 55%, rgba(14,43,38,.12) 100%);
}
.story-inner { position: relative; z-index: 2; display: flex; justify-content: flex-start; }
.story-card {
  max-width: 560px;
  padding: 46px;
  border-radius: var(--r-lg);
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid rgba(255,255,255,.65);
  box-shadow: 0 24px 60px rgba(14,43,38,.22);
}
.story-card h2 { font-size: clamp(28px, 3.4vw, 38px); font-weight: 800; letter-spacing: -.01em; color: var(--teal-deep); margin-bottom: 18px; }
.story-card p { font-size: 16px; color: var(--ink-2); line-height: 1.85; margin-bottom: 14px; }
.story-card strong { color: var(--mint-deep); }
.story-card .btn { margin-top: 12px; }

/* ============================================================
   下载行动
   ============================================================ */
.download { position: relative; padding: 130px 0; overflow: hidden; }
.dl-bg { position: absolute; inset: 0; }
.dl-bg img { width: 100%; height: 100%; object-fit: cover; }
.dl-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(14,43,38,.55) 0%, rgba(14,43,38,.78) 100%);
}
.dl-inner {
  position: relative; z-index: 2;
  display: grid;
  grid-template-columns: 1.2fr .8fr;
  align-items: center;
  gap: 60px;
}
.dl-copy h2 { font-size: clamp(32px, 4.4vw, 50px); font-weight: 800; letter-spacing: -.01em; color: #fff; line-height: 1.15; }
.dl-copy > p { margin-top: 16px; font-size: 18px; color: rgba(255,255,255,.82); }
.dl-btns { display: flex; gap: 16px; margin-top: 36px; flex-wrap: wrap; }
.btn-store {
  display: inline-flex; align-items: center; gap: 12px;
  padding: 12px 22px;
  border-radius: 16px;
  background: rgba(255,255,255,.14);
  border: 1px solid rgba(255,255,255,.24);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: background .3s ease, transform .35s ease;
}
.btn-store:hover { background: rgba(255,255,255,.24); transform: translateY(-3px); }
.bs-ico { width: 26px; height: 26px; fill: none; stroke: #fff; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.bs-txt { display: flex; flex-direction: column; line-height: 1.15; color: #fff; font-size: 16px; font-weight: 700; text-align: left; }
.bs-txt small { font-size: 11px; font-weight: 500; color: rgba(255,255,255,.72); margin-bottom: 3px; }
.dl-note { display: block; margin-top: 24px; font-size: 13.5px; color: rgba(255,255,255,.66); letter-spacing: .03em; }

/* 内测下载按钮 */
.dl-tag { background: rgba(255,255,255,.14); color: #DFF3EA; border: 1px solid rgba(255,255,255,.2); margin-bottom: 22px; }
.btn-store-active {
  background: linear-gradient(135deg, #3CC79A, #1F9C77);
  border: 1px solid rgba(255,255,255,.3);
  box-shadow: 0 10px 30px rgba(31,156,119,.4);
}
.btn-store-active:hover { background: linear-gradient(135deg, #48D4A8, #24AD85); transform: translateY(-3px); box-shadow: 0 14px 36px rgba(31,156,119,.5); }
.btn-store:disabled { opacity: .55; cursor: not-allowed; filter: saturate(.55); }
.btn-store:disabled:hover { transform: none; background: rgba(255,255,255,.14); }

.dl-qr { display: flex; justify-content: center; }
.qr-box {
  width: 190px;
  background: #fff;
  border-radius: 26px;
  padding: 24px 22px 20px;
  text-align: center;
  box-shadow: 0 24px 60px rgba(0,0,0,.35);
}
.qr { width: 132px; height: 132px; margin: 0 auto; display: block; }
.qr-img { width: 140px; height: 140px; margin: 0 auto; display: block; border-radius: 10px; }
.qr-note { display: block; margin-top: 14px; font-size: 13px; font-weight: 600; color: var(--teal-deep); }

/* ============================================================
   页脚
   ============================================================ */
.footer { background: var(--teal-deep); padding: 70px 0 0; color: rgba(255,255,255,.75); }
.footer-inner { display: flex; justify-content: space-between; gap: 40px; flex-wrap: wrap; padding-bottom: 46px; }
.footer-brand { max-width: 280px; }
.footer-brand .brand { margin-bottom: 14px; }
.footer-brand .brand-name { color: #fff; }
.footer-brand p { font-size: 14px; line-height: 1.7; color: rgba(255,255,255,.6); }
.footer-links { display: flex; gap: 70px; flex-wrap: wrap; }
.fcol h4 { font-size: 14px; font-weight: 700; color: #fff; margin-bottom: 16px; }
.fcol a { display: block; font-size: 14px; color: rgba(255,255,255,.62); margin-bottom: 11px; transition: color .3s ease; }
.fcol a:hover { color: #fff; }
.footer-bottom {
  display: flex; align-items: center; justify-content: space-between;
  padding: 22px 0;
  border-top: 1px solid rgba(255,255,255,.1);
  font-size: 13px; color: rgba(255,255,255,.45);
}
.fb-moto { letter-spacing: .12em; }

/* ============================================================
   滚动入场动画
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity .8s cubic-bezier(.2,.65,.3,1), transform .8s cubic-bezier(.2,.65,.3,1);
  will-change: opacity, transform;
}
.reveal.in { opacity: 1; transform: none; }

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1024px) {
  .hero-inner { grid-template-columns: 1fr; gap: 70px; text-align: center; }
  .hero-copy .lead { margin-inline: auto; }
  .hero-cta, .hero-points { justify-content: center; }
  .hero { min-height: auto; padding-top: 130px; }
  .promise-grid { grid-template-columns: 1fr 1fr; }
  .feature-grid { grid-template-columns: 1fr 1fr; }
  .design-grid { grid-template-columns: 1fr; gap: 48px; }
  .design-copy { text-align: center; }
  .design-copy > p { margin-inline: auto; }
  .design-list { align-items: center; }
  .dl-inner { grid-template-columns: 1fr; text-align: center; justify-items: center; gap: 44px; }
  .dl-btns { justify-content: center; }
  .fc-a { left: 0; }
  .fc-b { right: 0; }
}

@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 72px; left: 0; right: 0;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 20px 24px 28px;
    background: rgba(255,255,255,.96);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    box-shadow: 0 20px 40px rgba(14,43,38,.1);
    transform: translateY(-140%);
    opacity: 0;
    transition: transform .45s ease, opacity .35s ease;
    border-radius: 0 0 24px 24px;
  }
  .nav-links.open { transform: translateY(0); opacity: 1; }
  .nav-link { font-size: 17px; padding: 10px 0; }
  .nav-toggle { display: flex; }
  .nav-right .btn { display: none; }
  .promise-grid, .feature-grid { grid-template-columns: 1fr; }
  .story-card { padding: 34px 26px; }
  .footer-inner { flex-direction: column; }
  .footer-links { gap: 34px; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
  .fc-a { top: 2%; left: 2%; }
  .fc-b { bottom: 6%; right: 2%; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
}