/* ============================================================================
 * 默问 · 样式
 * 设计原则：安静、克制、把注意力留给文字本身
 * ==========================================================================*/

:root {
  --bg: #f6f4f1;
  --card: #fffdfa;
  --card-2: #faf7f3;
  --ink: #2e2b28;
  --ink-body: #3b3733;
  --ink-soft: #6f6a63;
  --ink-faint: #a09a91;
  --line: #e5e0d8;
  --line-soft: #efebe4;
  --accent: #4a6157;
  --accent-ink: #3d534a;
  --accent-wash: rgba(74, 97, 87, 0.09);
  --warn: #8a5a2b;
  --warn-wash: rgba(138, 90, 43, 0.10);
  --shadow: 0 1px 2px rgba(46, 43, 40, 0.04), 0 8px 24px rgba(46, 43, 40, 0.05);
  --radius: 14px;
  --serif: "Source Han Serif SC", "Songti SC", "SimSun", "Noto Serif CJK SC", Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei",
          "Source Han Sans SC", "Noto Sans CJK SC", "Helvetica Neue", Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16181a;
    --card: #1e2124;
    --card-2: #232629;
    --ink: #ddd9d3;
    --ink-body: #cfcbc5;
    --ink-soft: #97928b;
    --ink-faint: #7a756e;
    --line: #2c3034;
    --line-soft: #262a2d;
    --accent: #8fae9e;
    --accent-ink: #a8c4b5;
    --accent-wash: rgba(143, 174, 158, 0.12);
    --warn: #c79a63;
    --warn-wash: rgba(199, 154, 99, 0.12);
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.22);
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.shell {
  max-width: 720px;
  margin: 0 auto;
  padding: 40px 24px 8px;
}

/* ------------------------------------------------------------------ 顶栏 */
.topbar {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 18px;
}

.logo {
  margin: 0;
  font-family: var(--serif);
  font-size: 30px;
  font-weight: 600;
  letter-spacing: 0.14em;
  line-height: 1.1;
  color: var(--ink);
}

.tagline {
  margin: 6px 0 0;
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--ink-faint);
}

.daystamp {
  font-size: 13px;
  color: var(--ink-soft);
  letter-spacing: 0.04em;
  white-space: nowrap;
  padding-bottom: 4px;
}
.stamp-sep { margin: 0 6px; color: var(--ink-faint); }

/* ------------------------------------------------------------------ 标签页 */
.tabs {
  display: flex;
  gap: 4px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 22px;
}

.tab {
  appearance: none;
  border: 0;
  background: transparent;
  font-family: inherit;
  font-size: 14px;
  color: var(--ink-soft);
  padding: 9px 14px 10px;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: color 0.18s ease, border-color 0.18s ease;
}
.tab:hover { color: var(--ink); }
.tab.is-active {
  color: var(--accent-ink);
  border-bottom-color: var(--accent);
  font-weight: 500;
}
.tab em {
  font-style: normal;
  font-size: 11px;
  color: var(--accent);
  letter-spacing: 0;
}

/* ------------------------------------------------------------------ 提示条 */
.banner {
  margin: 0 0 18px;
  padding: 10px 14px;
  font-size: 13px;
  line-height: 1.6;
  border-radius: 10px;
  background: var(--accent-wash);
  color: var(--accent-ink);
}
.banner--warn {
  background: var(--warn-wash);
  color: var(--warn);
}

/* ------------------------------------------------------------------ 卡片 */
.view { animation: fade 0.28s ease both; }
@keyframes fade {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: none; }
}

.card {
  background: var(--card);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 30px 32px 22px;
}

.card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 18px;
}

.chip {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.08em;
  padding: 3px 10px;
  border-radius: 999px;
  background: var(--accent-wash);
  color: var(--accent-ink);
}
.chip--sm { font-size: 11px; padding: 2px 8px; }

.card-meta {
  font-size: 12.5px;
  color: var(--ink-faint);
  letter-spacing: 0.03em;
}

.question {
  margin: 0 0 22px;
  font-family: var(--serif);
  font-size: 23px;
  font-weight: 600;
  line-height: 1.72;
  letter-spacing: 0.01em;
  color: var(--ink);
}

.answer p {
  margin: 0 0 1.05em;
  font-size: 15.8px;
  line-height: 1.95;
  color: var(--ink-body);
  letter-spacing: 0.012em;
  text-align: justify;
}
.answer p:last-child { margin-bottom: 0; }
.answer p:first-child { color: var(--ink); }

.card--fallback .answer p { color: var(--ink-body); }

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.88em;
  padding: 1px 5px;
  border-radius: 5px;
  background: var(--card-2);
  border: 1px solid var(--line-soft);
  color: var(--ink-soft);
}

/* ------------------------------------------------------------------ 操作区 */
.actions {
  display: flex;
  gap: 8px;
  margin-top: 26px;
  padding-top: 16px;
  border-top: 1px solid var(--line-soft);
}

.act {
  appearance: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: inherit;
  font-size: 13.5px;
  color: var(--ink-soft);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 7px 15px 7px 12px;
  cursor: pointer;
  transition: color 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}
.act svg { width: 16px; height: 16px; display: block; }
.act:hover { color: var(--ink); border-color: var(--ink-faint); }
.act.is-on {
  color: var(--accent-ink);
  border-color: var(--accent);
  background: var(--accent-wash);
}
.act--danger:hover { color: var(--warn); border-color: var(--warn); }

/* ------------------------------------------------------- 前一天 / 后一天 */
.daynav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 14px;
}

.ghost {
  appearance: none;
  font-family: inherit;
  font-size: 13px;
  color: var(--ink-soft);
  background: transparent;
  border: 0;
  padding: 8px 4px;
  cursor: pointer;
  transition: color 0.18s ease;
}
.ghost:hover:not([disabled]) { color: var(--accent-ink); }
.ghost[disabled] { color: var(--ink-faint); opacity: 0.5; cursor: default; }

.daynav-hint {
  font-size: 12.5px;
  color: var(--ink-faint);
  letter-spacing: 0.04em;
}

/* ------------------------------------------------------------------ 列表 */
.list-head { margin-bottom: 14px; }
.list-head h2 {
  margin: 0 0 4px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--ink);
}
.list-head p {
  margin: 0;
  font-size: 12.5px;
  color: var(--ink-faint);
}

.list { list-style: none; margin: 0; padding: 0; }

.row {
  display: flex;
  align-items: stretch;
  gap: 4px;
  border-bottom: 1px solid var(--line-soft);
}
.row:first-child { border-top: 1px solid var(--line-soft); }

.row-main {
  appearance: none;
  flex: 1;
  display: flex;
  gap: 16px;
  align-items: baseline;
  text-align: left;
  background: transparent;
  border: 0;
  font-family: inherit;
  padding: 15px 6px;
  cursor: pointer;
  transition: background 0.16s ease;
}
.row-main:hover { background: var(--card-2); }

.row-date {
  flex: 0 0 84px;
  font-size: 12.5px;
  color: var(--ink-faint);
  letter-spacing: 0.03em;
  padding-top: 2px;
}
.row-date em {
  display: block;
  font-style: normal;
  font-size: 11px;
  color: var(--ink-faint);
  opacity: 0.75;
}

.row-body { flex: 1; min-width: 0; }
.row-q {
  display: block;
  margin-top: 5px;
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--ink-body);
}
.row.is-fav .row-date::before {
  content: "♥";
  color: var(--accent);
  margin-right: 5px;
}

.row-del {
  appearance: none;
  background: transparent;
  border: 0;
  font-family: inherit;
  font-size: 18px;
  line-height: 1;
  color: var(--ink-faint);
  width: 34px;
  cursor: pointer;
  transition: color 0.16s ease;
}
.row-del:hover { color: var(--warn); }

.more {
  display: flex;
  justify-content: center;
  padding: 18px 0 4px;
}
.more .ghost {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 7px 18px;
}

.empty {
  padding: 40px 8px;
  text-align: center;
  color: var(--ink-soft);
}
.empty p { margin: 0 0 8px; font-size: 14px; }
.empty p:last-child { color: var(--ink-faint); font-size: 13px; }

/* ------------------------------------------------------------------ 关于 */
.card--about h2 {
  margin: 0 0 14px;
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.04em;
}
.card--about h3 {
  margin: 24px 0 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: 0.04em;
}
.card--about p {
  margin: 0 0 10px;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--ink-body);
}

.stats {
  display: flex;
  gap: 32px;
  margin: 20px 0 4px;
  padding: 16px 0;
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}
.stats div { display: flex; flex-direction: column; gap: 3px; }
.stats dt {
  font-size: 12px;
  color: var(--ink-faint);
  letter-spacing: 0.06em;
}
.stats dd {
  margin: 0;
  font-family: var(--serif);
  font-size: 19px;
  color: var(--accent-ink);
}

/* ------------------------------------------------------------------ 页脚 */
.footer {
  margin: 34px 0 40px;
  text-align: center;
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
}

/* ------------------------------------------------------------------ 气泡 */
.toast {
  position: fixed;
  left: 50%;
  bottom: 34px;
  transform: translateX(-50%);
  background: rgba(38, 36, 33, 0.94);
  color: #f2efe9;
  font-size: 13px;
  letter-spacing: 0.04em;
  padding: 9px 18px;
  border-radius: 999px;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.18);
  z-index: 50;
}
@media (prefers-color-scheme: dark) {
  .toast { background: rgba(228, 224, 216, 0.95); color: #23262a; }
}

/* ------------------------------------------------------------------ 移动端 */
@media (max-width: 600px) {
  .shell { padding: 26px 16px 8px; }
  .logo { font-size: 25px; }
  .topbar { align-items: center; }
  .daystamp { font-size: 12px; }
  .tabs { gap: 0; justify-content: space-between; }
  .tab { padding: 9px 6px 10px; font-size: 13.5px; }
  .card { padding: 24px 20px 18px; border-radius: 12px; }
  .question { font-size: 20px; line-height: 1.7; margin-bottom: 18px; }
  .answer p { font-size: 15.2px; line-height: 1.9; }
  .row-main { gap: 12px; padding: 14px 4px; }
  .row-date { flex: 0 0 62px; }
  .row-q { font-size: 14px; }
  .stats { gap: 22px; }
  .footer { margin: 26px 0 30px; }
}