/* ===== 「小小珍藏」官网样式 —— 暖纸手绘风（与 App 主题一致） ===== */

:root {
  --cream-paper: #F7F3EA;   /* 页面背景 */
  --warm-white:  #FFFCF7;   /* 卡片 */
  --trunk-brown: #986342;   /* 主色 / 强调 */
  --trunk-dark:  #7C4F33;   /* 主色按压态 */
  --dark-coffee: #40372F;   /* 标题正文 */
  --grey-brown:  #786C60;   /* 辅助文字 */
  --paper-edge:  #E5DDD0;   /* 分隔线 / 细边框 */
  --warm-beige:  #EDE4D7;   /* 柔和底色块 */
  --soft-green:  #68755D;   /* 点缀绿 */
  --radius-lg: 28px;
  --radius-md: 20px;
  --shadow-card: 0 6px 24px rgba(64, 55, 47, 0.08);
  --shadow-hover: 0 10px 32px rgba(64, 55, 47, 0.14);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei",
               -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--cream-paper);
  color: var(--dark-coffee);
  line-height: 1.7;
}

/* ===== 导航 ===== */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(247, 243, 234, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--paper-edge);
}

.nav-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--dark-coffee);
}

.brand-logo { width: 40px; height: 40px; object-fit: contain; }

.brand-name { font-size: 1.2rem; font-weight: 700; letter-spacing: 0.05em; }

.brand-sub {
  font-size: 0.8rem;
  color: var(--grey-brown);
  margin-top: 3px;
}

.nav-links { display: flex; gap: 28px; }

.nav-links a {
  text-decoration: none;
  color: var(--dark-coffee);
  font-size: 0.95rem;
  padding: 4px 2px;
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}

.nav-links a:hover {
  color: var(--trunk-brown);
  border-bottom-color: var(--trunk-brown);
}

/* ===== Hero ===== */
.hero { padding: 72px 24px 80px; }

.hero-inner {
  max-width: 1080px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 48px;
  align-items: center;
}

.hero h1 {
  font-size: 2.6rem;
  line-height: 1.35;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.accent { color: var(--trunk-brown); }

.hero-desc {
  margin-top: 20px;
  color: var(--grey-brown);
  font-size: 1.05rem;
  max-width: 46em;
}

.hero-badges {
  margin-top: 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.badge {
  background: var(--warm-beige);
  border: 1px solid var(--paper-edge);
  color: var(--dark-coffee);
  font-size: 0.85rem;
  padding: 6px 14px;
  border-radius: 999px;
}

.hero-actions {
  margin-top: 32px;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.hero-art { text-align: center; }

.hero-art img {
  width: 100%;
  max-width: 420px;
  filter: drop-shadow(0 16px 28px rgba(64, 55, 47, 0.18));
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 999px;
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: transform 0.15s, box-shadow 0.2s, background 0.2s;
}

.btn-primary {
  background: var(--trunk-brown);
  color: var(--warm-white);
  box-shadow: 0 6px 16px rgba(152, 99, 66, 0.35);
}

.btn-primary:hover {
  background: var(--trunk-dark);
  transform: translateY(-2px);
  box-shadow: 0 10px 22px rgba(152, 99, 66, 0.4);
}

.btn-ghost {
  background: transparent;
  color: var(--trunk-brown);
  border: 1.5px solid var(--trunk-brown);
}

.btn-ghost:hover { background: rgba(152, 99, 66, 0.08); }

.btn-disabled {
  background: var(--warm-beige);
  color: var(--grey-brown);
  cursor: not-allowed;
}

/* ===== 通用区块 ===== */
.section {
  max-width: 1080px;
  margin: 0 auto;
  padding: 72px 24px;
}

.section-title {
  font-size: 2rem;
  font-weight: 800;
  text-align: center;
}

.section-sub {
  text-align: center;
  color: var(--grey-brown);
  margin-top: 10px;
}

/* ===== 功能卡片 ===== */
.feature-grid {
  margin-top: 48px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}

.card {
  background: var(--warm-white);
  border: 1px solid var(--paper-edge);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  box-shadow: var(--shadow-card);
  transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.card-icon {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-md);
  background: var(--warm-beige);
  color: var(--trunk-brown);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.card h3 {
  font-size: 1.25rem;
  margin-bottom: 12px;
}

.card p {
  color: var(--grey-brown);
  font-size: 0.95rem;
}

/* ===== 隐私区块 ===== */
.privacy-inner {
  background: var(--warm-white);
  border: 1px solid var(--paper-edge);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 56px 48px;
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 40px;
  align-items: center;
}

.privacy .section-title { text-align: left; }

.privacy-list {
  list-style: none;
  margin-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.privacy-list li {
  position: relative;
  padding-left: 24px;
  color: var(--grey-brown);
}

.privacy-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--soft-green);
}

.privacy-list strong { color: var(--dark-coffee); }

.privacy-badge-box { display: flex; justify-content: center; }

.lock-card {
  background: var(--warm-beige);
  border: 2px dashed var(--paper-edge);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  text-align: center;
  color: var(--trunk-brown);
  font-weight: 600;
}

.lock-card p { margin-top: 16px; color: var(--dark-coffee); }

/* ===== 下载区块 ===== */
.download-grid {
  margin-top: 48px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 360px));
  justify-content: center;
  gap: 24px;
}

.download-card {
  background: var(--warm-white);
  border: 1px solid var(--paper-edge);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 40px 32px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}

.download-card--disabled { opacity: 0.75; }

.platform {
  color: var(--trunk-brown);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.platform h3 { color: var(--dark-coffee); font-size: 1.3rem; }

.download-card > p { color: var(--grey-brown); font-size: 0.92rem; }

.btn-download { margin-top: 6px; }

.download-note { font-size: 0.82rem; color: var(--grey-brown); }

.download-card .download-meta {
  color: var(--trunk-dark);
  font-size: 1rem;
  font-weight: 600;
}

.download-card .download-note { font-size: 0.82rem; }

.download-card .download-status,
.download-card .download-browser-tip {
  padding: 12px 16px;
  border-radius: 12px;
  background: var(--warm-beige);
  color: var(--dark-coffee);
  font-size: 0.85rem;
}

.download-help {
  width: 100%;
  margin-top: 6px;
  padding-top: 16px;
  border-top: 1px solid var(--paper-edge);
  text-align: left;
  color: var(--grey-brown);
  font-size: 0.85rem;
}

.download-help summary {
  cursor: pointer;
  color: var(--trunk-dark);
  font-weight: 600;
}

.download-help ol { padding-left: 20px; margin-top: 14px; }
.download-help li + li { margin-top: 8px; }
.download-help p { margin-top: 14px; }
.download-help a { display: inline-block; margin-top: 12px; color: var(--trunk-dark); }

.btn:focus-visible, .download-help summary:focus-visible, .download-help a:focus-visible {
  outline: 3px solid var(--soft-green);
  outline-offset: 4px;
}

.download-card--disabled { align-self: start; }

/* ===== 页脚 ===== */
.footer {
  border-top: 1px solid var(--paper-edge);
  background: var(--warm-beige);
  margin-top: 48px;
}

.footer-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 40px 24px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
}

.footer-logo { width: 32px; height: 32px; object-fit: contain; }

.footer-copy { color: var(--grey-brown); font-size: 0.88rem; }

.footer-icp a {
  color: var(--grey-brown);
  font-size: 0.82rem;
  text-decoration: none;
}

.footer-icp a:hover { color: var(--trunk-brown); text-decoration: underline; }

/* ===== 响应式 ===== */
@media (max-width: 860px) {
  .hero-inner { grid-template-columns: 1fr; text-align: center; }
  .hero-art { order: -1; }
  .hero-art img { max-width: 280px; }
  .hero-badges, .hero-actions { justify-content: center; }
  .hero h1 { font-size: 2rem; }

  .privacy-inner { grid-template-columns: 1fr; padding: 40px 28px; }
  .download-grid { grid-template-columns: 1fr; }

  .nav-links { gap: 18px; }
  .brand-sub { display: none; }
}