:root {
  --ink: #12100e;
  --ink-2: #191512;
  --ink-3: #221c17;
  --line: rgba(201, 162, 113, 0.16);
  --warm: #c9a271;
  --warm-2: #e0bd8f;
  --paper: #f2ede4;
  --muted: #8f887b;
  --red: #a63e1e;
}

* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  margin: 0;
  background: var(--ink);
  color: var(--paper);
  font: 15px/1.75 'Microsoft YaHei UI', 'Segoe UI', system-ui, -apple-system, sans-serif;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a {
  color: var(--warm);
  text-decoration: none;
}
a:hover {
  color: var(--warm-2);
}
img {
  max-width: 100%;
  display: block;
}
.wrap {
  width: min(1080px, calc(100% - 48px));
  margin: 0 auto;
}

/* ---------- 顶栏 ---------- */
header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(12px);
  background: rgba(18, 16, 14, 0.82);
  border-bottom: 1px solid var(--line);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 17px;
  letter-spacing: 0.2em;
  color: var(--warm);
}
.brand i {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: radial-gradient(circle at 34% 30%, #b5804a, #4a2a17 70%);
  box-shadow: inset 0 0 6px rgba(0, 0, 0, 0.6), 0 0 12px rgba(201, 162, 113, 0.25);
  flex: none;
}
.nav nav {
  display: flex;
  gap: 26px;
  font-size: 13px;
  color: var(--muted);
}
.nav nav a {
  color: var(--muted);
}
.nav nav a:hover {
  color: var(--warm);
}

/* ---------- 通用 ---------- */
section {
  padding: 76px 0;
  border-bottom: 1px solid rgba(201, 162, 113, 0.07);
}
h2 {
  font-size: 24px;
  font-weight: 500;
  margin: 0 0 10px;
  letter-spacing: 0.04em;
}
.lead {
  color: var(--muted);
  font-size: 14px;
  margin: 0 0 32px;
}
.eyebrow {
  color: var(--warm);
  font-size: 12px;
  letter-spacing: 0.28em;
  margin-bottom: 12px;
}

/* ---------- 首屏 ---------- */
.hero {
  padding: 96px 0 84px;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
  background: radial-gradient(ellipse 60% 50% at 72% 40%, rgba(166, 62, 30, 0.13), transparent 70%);
}
.hero h1 {
  font-size: 44px;
  line-height: 1.28;
  font-weight: 600;
  margin: 0 0 20px;
  letter-spacing: 0.01em;
}
.hero h1 em {
  font-style: normal;
  color: var(--warm);
}
.hero p {
  color: var(--muted);
  font-size: 15px;
  margin: 0 0 30px;
  max-width: 30em;
}
.cta {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  align-items: center;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 10px;
  border: 1px solid var(--line);
  color: var(--paper);
  font-size: 14px;
  transition: all 160ms ease;
}
.btn.primary {
  background: linear-gradient(180deg, #c9a271, #a67f4c);
  border-color: transparent;
  color: #201712;
  font-weight: 600;
  box-shadow: 0 8px 24px rgba(201, 162, 113, 0.18);
}
.btn.primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 12px 28px rgba(201, 162, 113, 0.26);
}
.btn:hover {
  border-color: rgba(201, 162, 113, 0.5);
}
.btn[aria-disabled='true'] {
  opacity: 0.55;
  cursor: not-allowed;
}
.note {
  color: var(--muted);
  font-size: 12px;
  margin-top: 14px;
}
.hero-visual {
  position: relative;
}
.hero-visual img {
  /* 透明渲染图：不加底色、不加边框，直接叠在页面背景上 */
  filter: drop-shadow(0 28px 52px rgba(0, 0, 0, 0.55));
}
.hero-visual::after {
  /* 核桃背后的暖色光晕 */
  content: '';
  position: absolute;
  inset: 8% 6% -12% 6%;
  background: radial-gradient(ellipse at 50% 55%, rgba(201, 162, 113, 0.22), transparent 68%);
  filter: blur(26px);
  z-index: -1;
  pointer-events: none;
}

/* ---------- 卖点 ---------- */
.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.card {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 24px 22px;
  background: linear-gradient(180deg, rgba(201, 162, 113, 0.05), transparent 55%);
}
.card .ico {
  font-size: 20px;
  margin-bottom: 12px;
}
.card h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 500;
}
.card p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.75;
}

/* ---------- 图组 ---------- */
.shots {
  display: grid;
  gap: 18px;
}
.shots img {
  border-radius: 14px;
  border: 1px solid var(--line);
}
.caption {
  color: var(--muted);
  font-size: 12px;
  margin-top: 10px;
  text-align: center;
}

/* ---------- 隐私 ---------- */
.privacy-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}
.pitem {
  display: flex;
  gap: 14px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--ink-2);
}
.pitem .tick {
  color: var(--warm);
  font-size: 16px;
  line-height: 1.5;
}
.pitem h4 {
  margin: 0 0 6px;
  font-size: 14px;
  font-weight: 500;
}
.pitem p {
  margin: 0;
  color: var(--muted);
  font-size: 12.5px;
  line-height: 1.7;
}

/* ---------- FAQ ---------- */
details {
  border-bottom: 1px solid rgba(201, 162, 113, 0.1);
  padding: 18px 0;
}
summary {
  cursor: pointer;
  font-size: 14.5px;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
summary::-webkit-details-marker {
  display: none;
}
summary::after {
  content: '+';
  color: var(--warm);
  font-size: 18px;
}
details[open] summary::after {
  content: '−';
}
details p {
  color: var(--muted);
  font-size: 13px;
  margin: 12px 0 0;
  line-height: 1.8;
}

/* ---------- 下载 ---------- */
.dl {
  text-align: center;
  background: radial-gradient(ellipse 50% 70% at 50% 0%, rgba(201, 162, 113, 0.1), transparent 70%);
}
.dl h2 {
  font-size: 28px;
  margin-bottom: 14px;
}
.dl p {
  color: var(--muted);
  font-size: 14px;
  margin: 0 0 28px;
}

/* ---------- 页脚 ---------- */
footer {
  padding: 40px 0 56px;
  color: var(--muted);
  font-size: 12.5px;
}
footer .row {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
  align-items: center;
}
footer .links {
  display: flex;
  gap: 20px;
}
footer .beian {
  margin-top: 18px;
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  font-size: 12px;
}
footer .beian a {
  color: var(--muted);
}
footer .beian a:hover {
  color: var(--warm);
}

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
    padding: 64px 0;
  }
  .hero h1 {
    font-size: 32px;
  }
  .cards,
  .privacy-grid {
    grid-template-columns: 1fr;
  }
  .nav nav {
    display: none;
  }
  section {
    padding: 56px 0;
  }
}