/*
 * 慢记官网探索稿 · 共享基础样式
 * 颜色一律来自 tokens.css。字体：正文系统无衬线，展示衬线只给「开场白」（design.md §6）。
 */
:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-serif: "Songti SC", "STSong", "Noto Serif SC", "Source Han Serif SC", "Source Han Serif CN", serif;
  --gutter: 16px;
  --max: 1120px;
  --radius-card: 28px;
  --radius-control: 15px;
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
}
@media (min-width: 720px) { :root { --gutter: 40px; } }

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; }
button { font: inherit; color: inherit; }
h1, h2, h3, p { margin: 0; }
h1, h2, h3 { text-wrap: balance; }
p { text-wrap: pretty; }

.serif { font-family: var(--font-serif); }
.num { font-variant-numeric: tabular-nums; }
.wrap { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 var(--gutter); }
.muted { color: var(--ink-muted); }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }

/* ---------- 玻璃：模糊 + 均匀半透明面色 + 发丝边 + 短软阴影（design.md §7.18.1） ---------- */
.glass {
  background: var(--glass-card-tint);
  border: 1px solid var(--glass-card-border);
  border-radius: var(--radius-card);
  box-shadow: 0 18px 40px -28px var(--glass-contact-shadow), 0 2px 6px -4px var(--glass-contact-shadow);
  -webkit-backdrop-filter: blur(22px);
  backdrop-filter: blur(22px);
}
.glass-strong {
  background: var(--glass-strong);
  border: 1px solid var(--glass-card-border);
  border-radius: var(--radius-card);
  -webkit-backdrop-filter: blur(22px);
  backdrop-filter: blur(22px);
}
@media (prefers-reduced-transparency: reduce) {
  .glass { background: var(--glass-fallback); -webkit-backdrop-filter: none; backdrop-filter: none; }
  .glass-strong { background: var(--glass-fallback-strong); -webkit-backdrop-filter: none; backdrop-filter: none; }
}

/* ---------- 按钮：primary / secondary / quiet 三级（design.md §7.8） ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 48px; padding: 0 22px;
  border-radius: var(--radius-control);
  font-size: 15px; font-weight: 600; letter-spacing: 0.01em;
  text-decoration: none; border: 1px solid transparent; cursor: pointer;
  transition: transform 120ms var(--ease-out), background-color 160ms ease, border-color 160ms ease;
}
.btn:active { transform: scale(0.985); }
.btn-primary { background: var(--accent-strong); color: var(--on-accent); }
.btn-secondary { background: var(--glass-strong); color: var(--ink); border-color: var(--glass-card-border); }
.btn-quiet { background: transparent; color: var(--accent-strong); padding: 0 8px; }
.btn:focus-visible, a:focus-visible, button:focus-visible { outline: 2px solid var(--ice); outline-offset: 3px; }
.btn .badge-note { font-weight: 500; opacity: 0.8; font-size: 13px; }

/* ---------- 「即将上架」：上架前的下载位。不是按钮，不可点，所以不用实心主色 ---------- */
.soon {
  display: inline-flex; align-items: center; gap: 10px;
  min-height: 52px; padding: 0 20px;
  border-radius: var(--radius-control);
  background: var(--glass-strong); border: 1px solid var(--glass-card-border); color: var(--ink);
  font-size: 15px; font-weight: 600; cursor: default; user-select: none; -webkit-user-select: none;
}
.soon i { flex: none; width: 8px; height: 8px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 22%, transparent); }
.soon small { font-size: 13px; font-weight: 500; color: var(--ink-muted); }
.soon.sm { min-height: 34px; padding: 0 12px; gap: 8px; border-radius: 12px; font-size: 13px; }
.soon.sm i { width: 6px; height: 6px; }

/* ---------- 顶栏 ---------- */
.site-nav {
  position: fixed; inset: 0 0 auto 0; z-index: 50;
  transition: background-color 220ms ease, border-color 220ms ease, -webkit-backdrop-filter 220ms ease, backdrop-filter 220ms ease;
  border-bottom: 1px solid transparent;
}
.site-nav .wrap { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.site-nav .brand { display: flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 600; font-size: 17px; }
.site-nav .brand img { width: 30px; height: 30px; border-radius: 8px; }
.site-nav nav { display: flex; align-items: center; gap: 4px; }
.site-nav nav a.link { display: none; text-decoration: none; font-size: 14px; font-weight: 500; padding: 10px 12px; border-radius: 10px; opacity: 0.86; }
.site-nav nav a.link:hover { opacity: 1; }
.site-nav .btn { min-height: 38px; padding: 0 14px; font-size: 14px; border-radius: 12px; }
@media (min-width: 720px) { .site-nav nav a.link { display: inline-flex; } }
.site-nav.is-solid {
  background: var(--glass-chrome);
  border-bottom-color: var(--divider);
  -webkit-backdrop-filter: blur(20px);
  backdrop-filter: blur(20px);
}
.site-nav.is-solid { color: var(--ink); }

/* ---------- 页脚 ---------- */
.site-footer { padding: 56px 0 40px; border-top: 1px solid var(--divider); font-size: 13px; color: var(--ink-muted); }
.site-footer .wrap { display: grid; gap: 28px; }
.site-footer .foot-brand { display: flex; align-items: center; gap: 12px; color: var(--ink); }
.site-footer .foot-brand img { width: 40px; height: 40px; border-radius: 10px; }
.site-footer .foot-brand strong { display: block; font-size: 16px; font-weight: 600; }
.site-footer .foot-links { display: flex; flex-wrap: wrap; gap: 6px 20px; }
.site-footer .foot-links a { text-decoration: none; color: var(--ink); font-weight: 500; padding: 6px 0; }
.site-footer .foot-legal { display: flex; flex-wrap: wrap; gap: 6px 16px; line-height: 1.7; }
.site-footer .foot-legal .placeholder { border-bottom: 1px dashed var(--stamp-edge); }
@media (min-width: 720px) {
  .site-footer .wrap { grid-template-columns: 1fr auto; align-items: start; }
  .site-footer .foot-legal { grid-column: 1 / -1; }
}

/* ---------- App 图标 ---------- */
.app-icon { border-radius: 22.5%; overflow: hidden; position: relative; }
.app-icon img { width: 100%; height: 100%; object-fit: cover; }
.icon-dark { display: none; }
:root[data-theme="dark"] .icon-light { display: none; }
:root[data-theme="dark"] .icon-dark { display: block; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .icon-light { display: none; }
  :root:not([data-theme="light"]) .icon-dark { display: block; }
}

/* ---------- 进入视口时一次性淡入（只动 transform / opacity） ---------- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity 700ms var(--ease-out), transform 700ms var(--ease-out); }
.reveal.is-in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  *, *::before, *::after { scroll-behavior: auto !important; }
}

/* ---------- 心芽 ---------- */
.sprout { display: block; overflow: visible; }
.sprout path { transition: fill 260ms ease, stroke 260ms ease; }
.sprout stop { transition: stop-color 260ms ease; }
@media (prefers-reduced-motion: reduce) {
  .sprout path, .sprout stop { transition: none; }
}