/* 「我知道」 主站样式 —— 简约 · 有呼吸感 */
:root {
  --bg: #FAF9F6;
  --card: #FFFFFF;
  --line: #ECE8E2;
  --ink: #2B2723;
  --ink-2: #5B544C;
  --ink-3: #766D64;
  --accent: #BC5446;
  --accent-ink: #B04E40;
  --accent-soft: #FFF3EE;
  --ok: #6FA57B;
  --radius: 16px;
  --shadow: 0 2px 12px rgba(43, 39, 35, 0.05);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -webkit-text-size-adjust: 100%;
}
.wrap { max-width: 860px; margin: 0 auto; padding: 0 24px; }

/* 顶栏 */
header.site {
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
  background: rgba(250, 249, 246, 0.9);
  backdrop-filter: blur(6px);
  position: sticky; top: 0; z-index: 20;
}
header.site .wrap { display: flex; align-items: baseline; justify-content: space-between; }
.logo { font-size: 20px; font-weight: 800; letter-spacing: 1px; }
.logo small { font-size: 12px; font-weight: 400; color: var(--ink-3); margin-left: 8px; letter-spacing: 0; }
nav a { color: var(--ink-2); text-decoration: none; font-size: 14px; margin-left: 20px; cursor: pointer; }
nav a:hover { color: var(--accent); }

/* Hero */
.hero { padding: 72px 0 48px; text-align: center; }
.hero h1 { font-size: 40px; font-weight: 800; letter-spacing: 2px; }
.hero .tagline { margin-top: 12px; color: var(--ink-2); font-size: 16px; }
.btn {
  border: none; cursor: pointer; font-size: 15px; border-radius: 999px;
  padding: 12px 28px; transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
  font-family: inherit;
}
.btn:active { transform: scale(.97); }
.btn-primary { background: var(--accent); color: #fff; box-shadow: 0 4px 16px rgba(188, 84, 70, .28); }
.btn-primary:hover { background: #A94B3E; }
.btn-ghost { background: var(--card); color: var(--ink); border: 1px solid var(--line); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }
.btn-sm { padding: 8px 18px; font-size: 14px; }

/* 区块标题 */
.sec-title { font-size: 15px; font-weight: 700; color: var(--ink-3); margin: 40px 0 16px; letter-spacing: 1px; }

/* 板块筛选 chips */
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  border: 1px solid var(--line); background: var(--card); color: var(--ink-2);
  border-radius: 999px; padding: 8px 18px; font-size: 14px; cursor: pointer; font-family: inherit;
  transition: all .18s ease;
}
.chip:hover { border-color: var(--accent); color: var(--accent); }
.chip.on { background: var(--accent); border-color: var(--accent); color: #fff; }

/* 板块卡片网格 */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 16px; }
.cat-card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px; cursor: pointer; transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}
.cat-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: var(--accent); }
.cat-card .name { font-size: 17px; font-weight: 700; }
.cat-card .meta { margin-top: 6px; font-size: 13px; color: var(--ink-3); }
.dots { margin-top: 12px; display: flex; gap: 4px; }
.dots i { width: 8px; height: 8px; border-radius: 50%; display: inline-block; background: var(--line); }
.dots i.浅 { background: #E8B58A; }
.dots i.中 { background: var(--accent); }
.dots i.深 { background: #7A4B3F; }

/* 题目卡片 */
.q-card {
  background: var(--card); border: 1px solid var(--line); border-radius: 20px;
  padding: 44px 40px; margin-top: 20px; box-shadow: var(--shadow); min-height: 320px;
  display: flex; flex-direction: column; justify-content: center;
}
.q-top { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.q-tag {
  font-size: 13px; background: var(--accent-soft); color: var(--accent-ink);
  border-radius: 999px; padding: 4px 14px; font-weight: 600;
}
.q-depth { font-size: 13px; color: var(--ink-3); }
.q-label { font-size: 13px; color: var(--ink-3); margin-top: 28px; letter-spacing: 1px; }
.q-scenario { font-size: 17px; color: var(--ink-2); margin-top: 6px; }
.q-question { font-size: 22px; font-weight: 700; margin-top: 14px; line-height: 1.6; }
.q-tags { margin-top: 20px; display: flex; gap: 6px; flex-wrap: wrap; }
.q-tags span { font-size: 12px; color: var(--ink-3); background: var(--bg); border-radius: 999px; padding: 3px 10px; }
.q-actions { margin-top: 32px; display: flex; gap: 10px; flex-wrap: wrap; }
.q-actions .btn { padding: 9px 20px; font-size: 14px; }
.q-empty { text-align: center; color: var(--ink-3); padding: 60px 0; }
.btn-fav.on { background: var(--accent-soft); color: var(--accent); border-color: var(--accent); }

/* 我的记录 */
.tabs { display: flex; gap: 8px; margin-bottom: 16px; flex-wrap: wrap; }
.list { display: flex; flex-direction: column; gap: 10px; }
.list-item {
  background: var(--card); border: 1px solid var(--line); border-radius: 16px;
  padding: 14px 18px; font-size: 14px; color: var(--ink-2); display: flex; gap: 12px;
  justify-content: space-between; align-items: center;
}
.list-item .lt { font-size: 12px; color: var(--ink-3); white-space: nowrap; }
.list-item .link { color: var(--accent); cursor: pointer; font-size: 13px; white-space: nowrap; }
.empty { color: var(--ink-3); font-size: 14px; padding: 20px 0; }

/* 自定义问题表单 */
.custom-form { display: grid; gap: 12px; margin-top: 16px; }
.custom-form .row { display: flex; gap: 12px; flex-wrap: wrap; }
input, select, textarea {
  font-family: inherit; font-size: 14px; color: var(--ink);
  border: 1px solid var(--line); border-radius: 12px; padding: 11px 14px; background: var(--card);
  outline: none; transition: border-color .18s ease;
}
input:focus, select:focus, textarea:focus { border-color: var(--accent); }
::placeholder { color: var(--ink-3); opacity: 1; }
/* 键盘焦点可见性 */
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
input:focus-visible, select:focus-visible, textarea:focus-visible { outline: none; }
textarea { resize: vertical; min-height: 70px; }
.flex1 { flex: 1; min-width: 0; }
.full { width: 100%; }

/* 弹窗 */
.modal-mask {
  position: fixed; inset: 0; background: rgba(43, 39, 35, .4); z-index: 50;
  display: flex; align-items: center; justify-content: center; padding: 20px;
  opacity: 0; pointer-events: none; transition: opacity .2s ease;
}
.modal-mask.open { opacity: 1; pointer-events: auto; }
.modal {
  background: var(--bg); border-radius: 20px; max-width: 560px; width: 100%;
  max-height: 88vh; overflow: auto; padding: 28px;
}
.modal h3 { font-size: 17px; margin-bottom: 16px; }
.modal .foot { margin-top: 20px; display: flex; gap: 10px; justify-content: flex-end; flex-wrap: wrap; }
.pack-opts { display: grid; gap: 8px; }
.pack-opt {
  display: flex; align-items: center; gap: 10px; background: var(--card);
  border: 1px solid var(--line); border-radius: 12px; padding: 12px 16px; cursor: pointer;
}
.pack-opt input { accent-color: var(--accent); width: 16px; height: 16px; }
.pack-opt.on { border-color: var(--accent); background: var(--accent-soft); }

/* 分享卡片 */
.share-stage {
  background: #fff; border-radius: 16px; padding: 16px; display: flex; justify-content: center;
  border: 1px solid var(--line);
}
.share-card {
  width: 100%; max-width: 320px; background: #fff; border-radius: 12px; padding: 28px 24px 22px;
  display: flex; flex-direction: column; box-shadow: 0 2px 10px rgba(0,0,0,.06);
}
.share-card .sc-head { display: flex; align-items: baseline; justify-content: space-between; font-size: 13px; color: var(--ink-3); }
.share-card .sc-body { flex: 1; display: flex; flex-direction: column; justify-content: center; padding: 28px 0; }
.share-card .sc-cat { font-size: 12px; color: var(--accent-ink); background: var(--accent-soft); border-radius: 999px; padding: 3px 12px; width: fit-content; }
.share-card .sc-scenario { font-size: 14px; color: var(--ink-2); margin-top: 18px; }
.share-card .sc-question { font-size: 18px; font-weight: 700; line-height: 1.6; margin-top: 10px; }
.share-card .sc-foot { display: flex; align-items: flex-end; justify-content: space-between; gap: 12px; }
.share-card .sc-site { font-size: 15px; font-weight: 800; letter-spacing: 1px; }
.share-card .sc-slogan { font-size: 11px; color: var(--ink-3); margin-top: 2px; }
.share-card .sc-qr { text-align: center; }
.share-card .sc-qr img { width: 76px; height: 76px; display: block; }
.share-card .sc-qr span { font-size: 10px; color: var(--ink-3); }

/* Toast */
.toast {
  position: fixed; left: 50%; bottom: 40px; transform: translateX(-50%) translateY(20px);
  background: var(--ink); color: #fff; font-size: 14px; padding: 10px 22px; border-radius: 999px;
  opacity: 0; pointer-events: none; transition: all .25s ease; z-index: 99;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

footer.site { margin-top: 80px; padding: 28px 0 48px; border-top: 1px solid var(--line); text-align: center; color: var(--ink-3); font-size: 13px; }

@media (max-width: 560px) {
  header.site { padding: 14px 0; }
  .logo small { display: none; }
  nav a { margin-left: 14px; font-size: 13px; }
  .hero { padding: 44px 0 30px; }
  .hero h1 { font-size: 30px; }
  .hero .tagline { font-size: 15px; }
  .q-card { padding: 28px 22px; min-height: 240px; margin-top: 14px; }
  .q-question { font-size: 19px; }
  .q-label { margin-top: 20px; }
  .q-actions { margin-top: 24px; }
  .chip { padding: 11px 18px; }
  .modal-mask { padding: 14px; }
  .modal { padding: 22px; border-radius: 20px; }
  .share-stage { padding: 12px; }
  input, select, textarea { font-size: 16px; }
  .list-item { flex-wrap: wrap; }
}
@media (max-width: 380px) {
  .custom-form .row { flex-direction: column; }
  nav a { margin-left: 10px; }
}

/* 尊重系统"减少动态效果"设置 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
    scroll-behavior: auto !important;
  }
}

/* v2：板块折叠 + 空状态按钮 */
.cat-collapse { margin-top: 40px; }
.cat-toggle {
  width: 100%; display: flex; align-items: center; justify-content: space-between;
  background: var(--card); border: 1px solid var(--line); border-radius: 16px;
  padding: 15px 20px; font-size: 15px; font-weight: 700; color: var(--ink);
  cursor: pointer; font-family: inherit;
}
.cat-toggle:hover { border-color: var(--accent); color: var(--accent); }
.cat-toggle .chev { color: var(--ink-3); transition: transform .2s ease; font-size: 13px; }
.cat-collapse.collapsed .cat-panel { display: none; }
.cat-collapse.collapsed .chev { transform: rotate(-90deg); }
.cat-panel { margin-top: 14px; }
.q-empty p { margin-bottom: 18px; font-size: 15px; color: var(--ink-2); }
.q-empty-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }