:root {
  --paper: #f5f1e8;
  --paper-2: #efe8d8;
  --ink: #2b2620;
  --ink-soft: #6b6253;
  --cinnabar: #9e3d2e;
  --gold: #b8893b;
  --line: #d9cfb8;
  --maxw: 530px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { -webkit-text-size-adjust: 100%; }

body {
  font-family: "Noto Serif SC", "Songti SC", "STSong", "SimSun", serif;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.7;
  background-image:
    radial-gradient(circle at 20% 10%, rgba(184,137,59,.06), transparent 40%),
    radial-gradient(circle at 80% 90%, rgba(158,61,46,.05), transparent 40%);
}

/* 顶栏 */
.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  background: rgba(245,241,232,.9);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
}
.brand {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: .15em;
  color: var(--cinnabar);
}
.nav-dl {
  text-decoration: none;
  font-size: .9rem;
  color: var(--gold);
  border: 1px solid var(--gold);
  border-radius: 999px;
  padding: 4px 16px;
}

main { max-width: var(--maxw); margin: 0 auto; padding: 0 18px; }

/* Hero */
.hero {
  text-align: center;
  padding: 48px 0 36px;
}
.logo-img {
  width: 160px;
  height: auto;
  margin: 0 auto 18px;
  display: block;
}

.hero h1 {
  font-size: 2.6rem;
  letter-spacing: .35em;
  text-indent: .35em;
  color: var(--ink);
  margin-bottom: 10px;
}
.slogan {
  color: var(--ink-soft);
  font-size: 1rem;
  letter-spacing: .08em;
  margin-bottom: 26px;
}
.version { margin-top: 14px; font-size: .8rem; color: var(--ink-soft); }

/* 按钮 */
.btn-primary {
  display: inline-block;
  text-decoration: none;
  background: linear-gradient(135deg, var(--cinnabar), #7d2c20);
  color: #f7efe2;
  font-size: 1.05rem;
  letter-spacing: .1em;
  padding: 13px 38px;
  border-radius: 999px;
  box-shadow: 0 6px 18px rgba(158,61,46,.28);
  transition: transform .15s ease, box-shadow .15s ease;
}
.btn-primary:active { transform: translateY(1px); box-shadow: 0 3px 10px rgba(158,61,46,.25); }

/* 区块标题 */
h2 {
  text-align: center;
  font-size: 1.4rem;
  letter-spacing: .2em;
  text-indent: .2em;
  color: var(--ink);
  margin: 8px 0 22px;
  position: relative;
}
h2::after {
  content: "";
  display: block;
  width: 40px;
  height: 3px;
  margin: 12px auto 0;
  background: var(--gold);
  border-radius: 2px;
}

/* 功能网格 */
.features { padding: 30px 0; }
.feat-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}
.feat-card {
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 18px 16px;
  text-align: center;
}
.feat-ico {
  font-size: 1.6rem;
  color: var(--gold);
  margin-bottom: 8px;
}
.feat-card h3 {
  font-size: 0.95rem;
  letter-spacing: .08em;
  margin-bottom: 8px;
  color: var(--cinnabar);
}
.feat-card p {
  font-size: .82rem;
  color: var(--ink-soft);
  line-height: 1.6;
}

/* 下载区 */
.download {
  padding: 30px 0 44px;
  text-align: center;
}
.dl-tip { color: var(--ink-soft); font-size: .9rem; margin-bottom: 20px; }
.dl-meta { margin-top: 16px; font-size: .8rem; color: var(--ink-soft); }
.qr-wrap { margin: 22px auto 0; text-align: center; }
.qr {
  display: inline-block;
  padding: 10px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: 0 4px 14px rgba(43,38,32,.08);
}
.qr img, .qr canvas { display: block; }
.qr-tip { margin-top: 10px; font-size: .8rem; color: var(--ink-soft); }
.dl-ios { margin-top: 10px; font-size: .85rem; color: var(--ink-soft); }
.dl-note { margin-top: 18px; font-size: .72rem; color: #a89c84; }

/* 页脚 */
footer {
  border-top: 1px solid var(--line);
  padding: 22px 18px 36px;
  text-align: center;
  background: var(--paper-2);
}
.disclaimer { font-size: .74rem; color: #a89c84; line-height: 1.7; }
.copyright { margin-top: 12px; font-size: .74rem; color: #b3a890; letter-spacing: .1em; }

@media (min-width: 560px) {
  .feat-grid { grid-template-columns: 1fr 1fr 1fr; }
}