/* NihongoLab 公共设计系统：颜色、排版、按钮、卡片、导航。新页面统一引用本文件。 */
:root {
  color-scheme: light;
  --bg: #f4f7f6; --surface: #ffffff; --surface-2: #f0f5f3;
  --ink: #1d2b28; --muted: #62736e; --line: #dce6e2;
  --brand: #2f8f83; --brand-strong: #216e65; --brand-soft: #e2f3f0; --on-brand: #ffffff;
  --accent: #e8734f;
  --ok: #2b9a5a; --ok-strong: #1f7a46; --ok-soft: #e4f6ea;
  --bad: #d8504a; --bad-strong: #b23a35; --bad-soft: #fdebea;
  --warn: #a8791a; --warn-soft: #fff5dc;
  --radius: 14px; --radius-sm: 9px;
  --shadow: 0 1px 2px rgba(20, 50, 44, .06), 0 6px 18px rgba(20, 50, 44, .05);
  --font: "Segoe UI", system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-ja: "Yu Gothic UI", "Yu Gothic", "Hiragino Sans", "Noto Sans JP", "Meiryo", var(--font);
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0f1614; --surface: #18221f; --surface-2: #1f2b28;
  --ink: #e6efec; --muted: #9fb1ac; --line: #2f403b;
  --brand: #5cc0b2; --brand-strong: #8ad6ca; --brand-soft: #1e3531; --on-brand: #08201c;
  --accent: #f0906f;
  --ok: #6fcf97; --ok-strong: #93dfb2; --ok-soft: #1c3527;
  --bad: #f08a84; --bad-strong: #f6aaa5; --bad-soft: #3d2423;
  --warn: #e3c16a; --warn-soft: #352d18;
  --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 22px rgba(0, 0, 0, .25);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    color-scheme: dark;
    --bg: #0f1614; --surface: #18221f; --surface-2: #1f2b28;
    --ink: #e6efec; --muted: #9fb1ac; --line: #2f403b;
    --brand: #5cc0b2; --brand-strong: #8ad6ca; --brand-soft: #1e3531; --on-brand: #08201c;
    --accent: #f0906f;
    --ok: #6fcf97; --ok-strong: #93dfb2; --ok-soft: #1c3527;
    --bad: #f08a84; --bad-strong: #f6aaa5; --bad-soft: #3d2423;
    --warn: #e3c16a; --warn-soft: #352d18;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 22px rgba(0, 0, 0, .25);
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 15px/1.65 var(--font); }
a { color: var(--brand-strong); }
h1, h2, h3 { line-height: 1.3; margin: 0; text-wrap: balance; }
[lang="ja"], .ja { font-family: var(--font-ja); }
.hide { display: none !important; }
.muted { color: var(--muted); }
.num { font-variant-numeric: tabular-nums; }
:focus-visible { outline: 2px solid var(--brand); outline-offset: 2px; }

/* 页头与导航 */

.page { max-width: 1080px; margin: 0 auto; padding: 22px 16px 80px; }
.page-title { font-size: 24px; margin-bottom: 4px; }
.page-lead { color: var(--muted); margin: 0 0 18px; max-width: 62ch; }

/* 卡片 */
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow); }
.card + .card { margin-top: 14px; }
.card-title { font-size: 16px; margin-bottom: 12px; }

/* 按钮：底部加厚的实体感 */
.btn { font: inherit; font-weight: 700; font-size: 14.5px; display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 10px 18px; border-radius: 12px; border: 1px solid var(--brand-strong); border-bottom-width: 4px;
  background: var(--brand); color: var(--on-brand); cursor: pointer; text-decoration: none; transition: transform .06s, filter .12s; }
.btn:hover { filter: brightness(1.05); }
.btn:active { transform: translateY(2px); border-bottom-width: 2px; margin-top: 2px; }
.btn:disabled { opacity: .45; cursor: default; filter: none; }
.btn.ghost { background: var(--surface); color: var(--brand-strong); border-color: var(--line); }
.btn.ghost:hover { background: var(--surface-2); filter: none; }
.btn.ok { background: var(--ok); border-color: var(--ok-strong); }
.btn.bad { background: var(--bad); border-color: var(--bad-strong); }
.btn.sm { padding: 6px 12px; font-size: 13px; border-bottom-width: 3px; border-radius: 10px; }
.btn.block { width: 100%; }

/* 分段切换与筛选标签 */
.tabs { display: inline-flex; padding: 4px; gap: 4px; background: var(--surface-2); border-radius: 12px; border: 1px solid var(--line); max-width: 100%; overflow-x: auto; }
.tabs button { font: inherit; font-weight: 700; font-size: 14px; padding: 7px 16px; border: 0; border-radius: 9px; background: transparent; color: var(--muted); cursor: pointer; white-space: nowrap; }
.tabs button[aria-selected="true"] { background: var(--surface); color: var(--brand-strong); box-shadow: var(--shadow); }
.chips { display: flex; flex-wrap: wrap; gap: 7px; }
.chip { font: inherit; font-size: 13px; font-weight: 600; padding: 5px 12px; border-radius: 999px; border: 1px solid var(--line); background: var(--surface); color: var(--muted); cursor: pointer; }
.chip:hover { border-color: var(--brand); color: var(--ink); }
.chip[aria-pressed="true"] { background: var(--brand-soft); border-color: var(--brand); color: var(--brand-strong); }
.tag { display: inline-flex; align-items: center; font-size: 12px; font-weight: 700; padding: 2px 9px; border-radius: 999px; background: var(--surface-2); color: var(--muted); white-space: nowrap; }
.tag.brand { background: var(--brand-soft); color: var(--brand-strong); }
.tag.warn { background: var(--warn-soft); color: var(--warn); }
a.tag { text-decoration: none; }
a.tag:hover { text-decoration: underline; }

/* 表单 */
.field { display: flex; flex-direction: column; gap: 5px; font-size: 13px; color: var(--muted); font-weight: 600; }
.input, select.input { font: inherit; font-size: 14.5px; padding: 9px 12px; border: 1px solid var(--line); border-radius: var(--radius-sm); background: var(--surface); color: var(--ink); min-width: 0; }
.input:focus { outline: 2px solid var(--brand); outline-offset: 0; border-color: var(--brand); }

/* 进度条 */
.progress { height: 12px; border-radius: 999px; background: var(--surface-2); overflow: hidden; border: 1px solid var(--line); }
.progress > i { display: block; height: 100%; width: 0; border-radius: 999px; background: var(--ok); transition: width .3s ease; }

/* 数字统计 */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 10px; }
.stat { background: var(--surface-2); border-radius: var(--radius-sm); padding: 12px 14px; }
.stat b { display: block; font-size: 24px; line-height: 1.2; font-variant-numeric: tabular-nums; }
.stat span { font-size: 12.5px; color: var(--muted); }

.empty { text-align: center; color: var(--muted); padding: 36px 12px; }
.table-wrap { overflow-x: auto; }
table.grid { width: 100%; border-collapse: collapse; font-size: 14px; }
table.grid th, table.grid td { padding: 8px 10px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: middle; }
table.grid th { font-size: 12.5px; color: var(--muted); font-weight: 700; white-space: nowrap; }
table.grid td.r, table.grid th.r { text-align: right; font-variant-numeric: tabular-nums; }

@media (max-width: 640px) {
  .page { padding: 16px 12px 70px; }
  .card { padding: 14px; }
}
@media print {
  .site-header, .no-print { display: none !important; }
  body { background: #fff; color: #000; }
  .card { box-shadow: none; border: 0; padding: 0; }
}