/* ==========================================================================
   五十音练习 — 样式表
   手机优先；不使用任何外部字体或 CDN，全部使用系统自带字体。
   ========================================================================== */

:root {
  /* 清爽温暖的浅色配色 */
  --bg: #fdfaf6;
  --bg-soft: #f6efe7;
  --surface: #ffffff;
  --surface-2: #fbf7f2;
  --border: #ece1d5;
  --border-2: #e2d5c6;
  --text: #2e2823;
  --text-2: #6b6058;
  --text-3: #a2988d;
  --primary: #e06b3f;
  --primary-d: #c4552b;
  --primary-soft: #fdece4;
  --teal: #2f8f80;
  --teal-soft: #e3f3f0;
  --ok: #2f9e63;
  --ok-soft: #e6f6ec;
  --bad: #cf4f46;
  --bad-soft: #fdecea;
  --warn: #b8811a;
  --warn-soft: #fdf3e0;
  --shadow: 0 1px 2px rgba(93, 72, 52, .05), 0 6px 18px rgba(93, 72, 52, .06);
  --shadow-lg: 0 -2px 24px rgba(93, 72, 52, .14);
  --radius: 16px;
  --radius-sm: 11px;
  --tap: 48px;

  --font-ui: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Noto Sans CJK SC", "Source Han Sans SC", sans-serif;
  --font-kana: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic", "Meiryo",
    "Noto Sans CJK JP", "Noto Sans JP", "Source Han Sans SC", "Microsoft YaHei", sans-serif;
  --font-kana-serif: "Hiragino Mincho ProN", "Yu Mincho", "Noto Serif CJK JP",
    "Noto Serif JP", "Songti SC", "SimSun", serif;
}

/* 假名字体可选：黑体 / 明朝体（均为系统字体） */
body[data-kana-font="serif"] {
  --font-kana: var(--font-kana-serif);
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

/* hidden 属性必须始终生效：弹层/提示条用的是 display:flex 等规则，
   若不加 !important，作者样式会盖掉浏览器默认的 [hidden]{display:none}，
   导致隐藏的遮罩层仍然拦截整页点击。 */
[hidden] { display: none !important; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-ui);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overscroll-behavior-y: none;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
  background-image: radial-gradient(120% 60% at 50% 0%, #fff6ee 0%, rgba(255, 246, 238, 0) 60%);
  background-repeat: no-repeat;
}

button { font-family: inherit; font-size: inherit; color: inherit; cursor: pointer; }

h1, h2, h3, h4 { margin: 0; font-weight: 700; line-height: 1.35; }

/* ---------- 顶栏 ---------- */

.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: max(10px, env(safe-area-inset-top)) 16px 10px;
  background: rgba(253, 250, 246, .92);
  backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid var(--border);
}

.topbar__title {
  font-size: 17px;
  letter-spacing: .02em;
}

.topbar__sub {
  font-size: 11px;
  color: var(--text-3);
  font-weight: 500;
}

.topbar__spacer { flex: 1; }

.chip {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  height: 26px;
  padding: 0 10px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 600;
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text-2);
  white-space: nowrap;
}

.chip--ok { background: var(--ok-soft); border-color: #cdebd9; color: #1f7a4b; }
.chip--off { background: var(--warn-soft); border-color: #f0dcb4; color: var(--warn); }

.dot { width: 7px; height: 7px; border-radius: 50%; background: currentColor; }

/* ---------- 主区域 ---------- */

main {
  flex: 1;
  padding: 16px 16px calc(84px + env(safe-area-inset-bottom));
  max-width: 720px;
  width: 100%;
  margin: 0 auto;
}

.view { display: none; animation: fade .18s ease; }
.view.is-active { display: block; }

@keyframes fade { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }

.section-title {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin: 22px 2px 10px;
  font-size: 14px;
  font-weight: 700;
  color: var(--text-2);
}
.section-title:first-child { margin-top: 4px; }
.section-title small { font-size: 11px; font-weight: 500; color: var(--text-3); }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow);
}
.card + .card { margin-top: 12px; }

.card--hero {
  background: linear-gradient(160deg, #fff5ee 0%, #ffffff 55%);
  border-color: #f2ded0;
}

/* ---------- 按钮 ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  min-height: var(--tap);
  padding: 0 18px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-2);
  background: var(--surface);
  color: var(--text);
  font-size: 15px;
  font-weight: 600;
  transition: transform .08s ease, background .15s ease, border-color .15s ease;
}
.btn:active { transform: scale(.975); }
.btn:disabled { opacity: .45; }

.btn--primary {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
  box-shadow: 0 4px 14px rgba(224, 107, 63, .28);
}
.btn--primary:active { background: var(--primary-d); }

.btn--soft { background: var(--primary-soft); border-color: #f6d8c7; color: var(--primary-d); }
.btn--teal { background: var(--teal-soft); border-color: #c8e6e0; color: #1f7265; }
.btn--ghost { background: transparent; border-color: transparent; color: var(--text-2); }
.btn--danger { background: var(--bad-soft); border-color: #f3cdc9; color: var(--bad); }
.btn--block { width: 100%; }
.btn--lg { min-height: 58px; font-size: 17px; border-radius: 14px; }
/* 小号按钮也要保证单手可点，不低于 42px */
.btn--sm { min-height: 42px; padding: 0 13px; font-size: 13.5px; border-radius: 11px; }

.btn-row { display: flex; gap: 10px; flex-wrap: wrap; }
.btn-row > .btn { flex: 1 1 130px; }

/* ---------- 首页 ---------- */

.hero-title { font-size: 21px; margin-bottom: 6px; }
.hero-desc { font-size: 13.5px; color: var(--text-2); margin: 0 0 14px; }

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 14px;
}

.stat-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-top: 12px;
}

.stat {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 8px;
  text-align: center;
}
.stat__num { font-size: 20px; font-weight: 700; letter-spacing: -.01em; }
.stat__num small { font-size: 11px; font-weight: 600; color: var(--text-3); }
.stat__label { font-size: 11px; color: var(--text-3); margin-top: 1px; }

.progress {
  height: 8px;
  border-radius: 999px;
  background: var(--bg-soft);
  overflow: hidden;
  margin-top: 10px;
}
.progress__bar {
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--primary) 0%, #ef9166 100%);
  transition: width .3s ease;
}

.kv { display: flex; justify-content: space-between; gap: 12px; font-size: 13.5px; padding: 7px 0; }
.kv + .kv { border-top: 1px dashed var(--border); }
/* 标签不换行、不收缩；所有 .kv__k 文案都刻意保持简短。
   文案较长的设置项改用下面的 .setting 堆叠布局，避免把卡片撑宽。 */
.kv__k { color: var(--text-2); flex: 0 0 auto; white-space: nowrap; }
.kv__v { font-weight: 600; text-align: right; flex: 1 1 auto; min-width: 0; overflow-wrap: anywhere; }

/* 堆叠式设置行：标题 + 说明在上，控件在右 */
.setting { display: flex; align-items: flex-start; gap: 12px; padding: 9px 0; }
.setting + .setting { border-top: 1px dashed var(--border); }
.setting__main { flex: 1 1 auto; min-width: 0; }
.setting__title { font-size: 13.5px; color: var(--text-2); }
.setting__desc { font-size: 11px; color: var(--text-3); margin-top: 3px; line-height: 1.5; }
.setting__ctrl { flex: 0 0 auto; display: flex; align-items: center; gap: 6px; }

/* ---------- 五十音表 ---------- */

.seg {
  display: flex;
  gap: 4px;
  padding: 4px;
  background: var(--bg-soft);
  border-radius: 12px;
  margin-bottom: 12px;
}
.seg__btn {
  flex: 1;
  min-height: 40px;
  border: 0;
  border-radius: 9px;
  background: transparent;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-2);
}
.seg__btn.is-on {
  background: var(--surface);
  color: var(--primary-d);
  box-shadow: 0 1px 3px rgba(93, 72, 52, .12);
}

.kana-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 4px;
  table-layout: fixed;
}
.kana-table th {
  font-size: 10px;
  font-weight: 600;
  color: var(--text-3);
  padding-bottom: 2px;
}
.kana-table th.row-head {
  font-size: 10.5px;
  color: var(--text-2);
  width: 34px;
}

.kana-cell {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1.08;
  min-height: 46px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1px;
  padding: 2px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  transition: transform .08s ease, background .15s ease;
}
.kana-cell:active { transform: scale(.95); }
.kana-cell__kana {
  font-family: var(--font-kana);
  font-size: 23px;
  font-weight: 500;
  line-height: 1.05;
}
.kana-cell__romaji { font-size: 9.5px; color: var(--text-3); letter-spacing: .02em; }

.kana-cell--empty {
  background: #f7f2eb;
  border-style: dashed;
  border-color: #ece1d5;
  pointer-events: none;
}

.kana-cell--practiced { background: var(--ok-soft); border-color: #cfe9da; }
.kana-cell--weak { background: var(--warn-soft); border-color: #f0dcb4; }
.kana-cell--wrong { background: var(--bad-soft); border-color: #f3cdc9; }

.kana-cell__mark {
  position: absolute;
  top: 3px;
  right: 4px;
  font-size: 9px;
  font-weight: 700;
  line-height: 1;
}
.kana-cell--practiced .kana-cell__mark { color: #1f7a4b; }
.kana-cell--weak .kana-cell__mark { color: var(--warn); }
.kana-cell--wrong .kana-cell__mark { color: var(--bad); }

.legend { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 12px; font-size: 11px; color: var(--text-3); }
.legend span { display: inline-flex; align-items: center; gap: 5px; }
.legend i { width: 11px; height: 11px; border-radius: 3px; border: 1px solid var(--border-2); display: inline-block; }

.row-practice { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px; }
.row-practice .btn { justify-content: flex-start; padding: 0 12px; font-size: 13.5px; }
.row-practice .btn small { color: var(--text-3); font-weight: 500; font-family: var(--font-kana); }

/* ---------- 测验 ---------- */

.quiz-progress {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  color: var(--text-2);
  margin-bottom: 10px;
}
.quiz-progress .progress { flex: 1; margin: 0; }

.question-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 16px;
  text-align: center;
  box-shadow: var(--shadow);
}
.question-hint { font-size: 12px; color: var(--text-3); margin-bottom: 6px; }
.question-main {
  font-family: var(--font-kana);
  font-size: 92px;
  line-height: 1.15;
  font-weight: 500;
  letter-spacing: .02em;
}
.question-main--romaji {
  font-family: var(--font-ui);
  font-size: 52px;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--primary-d);
}

.options { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 14px; }
.option {
  min-height: 62px;
  border-radius: 14px;
  border: 1.5px solid var(--border-2);
  background: var(--surface);
  font-size: 20px;
  font-weight: 600;
  font-family: var(--font-kana);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: transform .08s ease, background .15s ease, border-color .15s ease;
}
.option--romaji { font-family: var(--font-ui); font-size: 19px; letter-spacing: .01em; }
.option:active { transform: scale(.97); }
.option:disabled { cursor: default; }
.option.is-correct { background: var(--ok-soft); border-color: var(--ok); color: #1c6e45; }
.option.is-wrong { background: var(--bad-soft); border-color: var(--bad); color: #a83c34; }
.option.is-dim { opacity: .5; }

.feedback {
  margin-top: 14px;
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  font-size: 14px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 10px;
}
.feedback--ok { background: var(--ok-soft); color: #1c6e45; }
.feedback--bad { background: var(--bad-soft); color: #a83c34; }
.feedback__answer { font-family: var(--font-kana); font-size: 19px; }

.result-score {
  font-size: 44px;
  font-weight: 700;
  letter-spacing: -.02em;
  text-align: center;
}
.result-score small { font-size: 18px; color: var(--text-3); font-weight: 600; }

/* ---------- 列表 ---------- */

.list { display: flex; flex-direction: column; }
.list-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 2px;
  border-bottom: 1px solid var(--border);
}
.list-item:last-child { border-bottom: 0; }
.list-item__kana {
  font-family: var(--font-kana);
  font-size: 26px;
  width: 46px;
  text-align: center;
  flex: none;
}
.list-item__body { flex: 1; min-width: 0; }
.list-item__title { font-size: 14px; font-weight: 600; }
.list-item__sub { font-size: 11.5px; color: var(--text-3); }
.list-item__right { font-size: 12px; color: var(--text-2); text-align: right; flex: none; }

.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 700;
  background: var(--bg-soft);
  color: var(--text-3);
}
.badge--ok { background: var(--ok-soft); color: #1c6e45; }
.badge--bad { background: var(--bad-soft); color: #a83c34; }
.badge--warn { background: var(--warn-soft); color: var(--warn); }
.badge--none { background: var(--bg-soft); color: var(--text-3); }

.empty {
  text-align: center;
  color: var(--text-3);
  font-size: 13.5px;
  padding: 26px 12px;
}

/* 每日记录条形图 */
.days { display: flex; align-items: flex-end; gap: 5px; height: 76px; margin-top: 6px; }
/* min-width:0 很关键：否则 flex 子项不会收缩到内容宽度以下，
   14 个日期标签会把整行撑宽，造成页面横向溢出、移动端布局视口被撑大。 */
.day { flex: 1 1 0; min-width: 0; display: flex; flex-direction: column; align-items: center; gap: 4px; height: 100%; justify-content: flex-end; }
.day__bar {
  width: 100%;
  min-height: 3px;
  border-radius: 4px 4px 2px 2px;
  background: var(--primary);
  opacity: .85;
}
.day__bar--zero { background: var(--bg-soft); }
.day__label { font-size: 9px; color: var(--text-3); white-space: nowrap; }

.filter-row { display: flex; gap: 6px; margin-bottom: 10px; flex-wrap: wrap; }
.filter-row .btn { flex: 1 1 auto; }

/* ---------- 底部导航 ---------- */

.tabbar {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 40;
  display: flex;
  padding: 6px 4px calc(6px + env(safe-area-inset-bottom));
  background: rgba(255, 255, 255, .96);
  backdrop-filter: saturate(160%) blur(12px);
  border-top: 1px solid var(--border);
}
.tabbar__btn {
  flex: 1;
  min-height: 52px;
  border: 0;
  background: transparent;
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-3);
}
.tabbar__btn .tabbar__dot {
  width: 18px;
  height: 3px;
  border-radius: 999px;
  background: currentColor;
  opacity: .22;
}
.tabbar__btn.is-on { color: var(--primary-d); }
.tabbar__btn.is-on .tabbar__dot { opacity: 1; }
.tabbar__count {
  position: absolute;
  transform: translate(16px, -18px);
  min-width: 16px;
  height: 16px;
  padding: 0 4px;
  border-radius: 999px;
  background: var(--bad);
  color: #fff;
  font-size: 10px;
  line-height: 16px;
  font-weight: 700;
}

/* ---------- 底部弹层 ---------- */

.sheet-backdrop {
  position: fixed;
  inset: 0;
  z-index: 60;
  background: rgba(46, 40, 35, .38);
  display: flex;
  align-items: flex-end;
  animation: fade .15s ease;
}
.sheet {
  width: 100%;
  max-height: 86dvh;
  overflow-y: auto;
  background: var(--surface);
  border-radius: 20px 20px 0 0;
  padding: 8px 18px calc(20px + env(safe-area-inset-bottom));
  box-shadow: var(--shadow-lg);
  animation: sheet-up .22s cubic-bezier(.2, .8, .3, 1);
}
@keyframes sheet-up { from { transform: translateY(24px); } to { transform: none; } }
.sheet__grab { width: 38px; height: 4px; border-radius: 999px; background: var(--border-2); margin: 6px auto 14px; }
.sheet__title { font-size: 17px; margin-bottom: 4px; }
.sheet__desc { font-size: 12.5px; color: var(--text-3); margin: 0 0 14px; }

.big-kana {
  font-family: var(--font-kana);
  font-size: 76px;
  line-height: 1.1;
  text-align: center;
  font-weight: 500;
}

/* ---------- 提示条 ---------- */

.toast {
  position: fixed;
  left: 50%;
  bottom: calc(96px + env(safe-area-inset-bottom));
  transform: translateX(-50%);
  z-index: 80;
  max-width: min(92vw, 460px);
  padding: 11px 16px;
  border-radius: 12px;
  background: rgba(46, 40, 35, .93);
  color: #fff;
  font-size: 13px;
  line-height: 1.5;
  text-align: center;
  box-shadow: 0 8px 24px rgba(0, 0, 0, .18);
  animation: fade .15s ease;
}
.toast--ok { background: rgba(31, 122, 75, .95); }
.toast--bad { background: rgba(168, 60, 52, .95); }

.notice {
  font-size: 12.5px;
  color: var(--text-2);
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-left: 3px solid var(--teal);
  border-radius: 10px;
  padding: 10px 12px;
  margin-top: 12px;
}
.notice--warn { border-left-color: var(--warn); background: var(--warn-soft); border-color: #f0dcb4; }

.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;
}

/* ---------- 桌面端微调 ---------- */

@media (min-width: 560px) {
  .options { grid-template-columns: repeat(4, 1fr); }
  /* 宽屏下格子改为固定高度，避免 aspect-ratio 把表格拉得过高 */
  .kana-cell { aspect-ratio: auto; height: 74px; }
  .kana-cell__kana { font-size: 27px; }
  .kana-cell__romaji { font-size: 10.5px; }
  .row-practice { grid-template-columns: repeat(3, 1fr); }
  .filter-row .btn { flex: 0 1 auto; }
}

@media (min-width: 900px) {
  main { padding-top: 24px; }
  .stat-row { grid-template-columns: repeat(6, 1fr); }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}