/* 墨痕 —— 稿紙與墨。
   視覺基底：宣紙暖白、墨黑、朱砂。方格稿紙的格線是全站的結構母題。 */

:root {
  --paper: #f6f1e6;
  --paper-deep: #efe7d7;
  --paper-card: #fdfaf3;
  --grid: #cfc4ac;
  --grid-soft: #e3dac6;
  --ink: #23201b;
  --ink-soft: #5a5347;
  --ink-faint: #8b8270;
  --cinnabar: #a8341f;
  --cinnabar-soft: #c86b52;
  --indigo: #35506b;
  --jade: #4a6b52;
  --radius: 4px;
  --serif: "Songti TC", "Noto Serif TC", "Source Han Serif TC", "PMingLiU", "MingLiU", Georgia, serif;
  --sans: "PingFang TC", "Noto Sans TC", "Heiti TC", -apple-system, system-ui, sans-serif;
  --shadow: 0 1px 2px rgba(35, 32, 27, .08), 0 8px 24px -14px rgba(35, 32, 27, .35);
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #17161a;
    --paper-deep: #101013;
    --paper-card: #1f1e23;
    --grid: #3a3740;
    --grid-soft: #2a2830;
    --ink: #e8e2d6;
    --ink-soft: #b6b0a4;
    --ink-faint: #857f74;
    --cinnabar: #e0765c;
    --cinnabar-soft: #c86b52;
    --indigo: #8fb2d4;
    --jade: #8fbf9c;
    --shadow: 0 1px 2px rgba(0, 0, 0, .5), 0 10px 30px -16px rgba(0, 0, 0, .8);
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--paper);
  /* 稿紙格線：極淡，只在大面積留白處看得出來 */
  background-image:
    linear-gradient(var(--grid-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-soft) 1px, transparent 1px);
  background-size: 34px 34px;
  background-position: -1px -1px;
  color: var(--ink);
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.85;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: var(--cinnabar); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--ink); }

.skip {
  position: absolute; left: -9999px; top: 0; z-index: 100;
  background: var(--ink); color: var(--paper); padding: .6rem 1rem;
}
.skip:focus { left: 0; }

/* ---------------------------------------------------------------- 版頭 */
.site-head {
  position: sticky; top: 0; z-index: 30;
  display: flex; align-items: center; gap: 1.5rem;
  padding: .7rem clamp(1rem, 4vw, 2.5rem);
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--grid);
}
.brand { display: flex; align-items: center; gap: .7rem; text-decoration: none; color: inherit; }
.brand-seal {
  display: grid; place-items: center;
  width: 2.6rem; height: 2.6rem;
  background: var(--cinnabar); color: #fdfaf3;
  font-size: .78rem; line-height: 1.05; letter-spacing: .04em;
  writing-mode: vertical-rl;
  border-radius: 2px;
  box-shadow: inset 0 0 0 1px rgba(253, 250, 243, .35);
}
.brand-text strong { display: block; font-size: 1.05rem; letter-spacing: .18em; }
.brand-text small { display: block; font-size: .72rem; color: var(--ink-faint); letter-spacing: .1em; }

.site-nav { display: flex; gap: .2rem; margin-left: auto; flex-wrap: wrap; }
.site-nav a {
  padding: .35rem .75rem; border-radius: var(--radius);
  color: var(--ink-soft); text-decoration: none; font-size: .93rem; letter-spacing: .08em;
}
.site-nav a:hover { background: var(--paper-deep); color: var(--ink); }
.site-nav a[aria-current="page"] { color: var(--cinnabar); box-shadow: inset 0 -2px 0 var(--cinnabar); }

/* ---------------------------------------------------------------- 版面 */
.view { flex: 1; width: 100%; max-width: 1180px; margin: 0 auto; padding: clamp(1.2rem, 4vw, 2.6rem) clamp(1rem, 4vw, 2.5rem) 4rem; }
.view.wide { max-width: 1600px; }

h1, h2, h3, h4 { font-weight: 600; line-height: 1.4; margin: 0 0 .6rem; }
h1 { font-size: clamp(1.6rem, 4vw, 2.3rem); letter-spacing: .06em; }
h2 { font-size: 1.3rem; letter-spacing: .05em; }
h3 { font-size: 1.05rem; letter-spacing: .04em; }

.lede { color: var(--ink-soft); max-width: 44rem; }
.muted { color: var(--ink-faint); }
.small { font-size: .85rem; }

.rule { border: 0; border-top: 1px solid var(--grid); margin: 2.2rem 0; }

.card {
  background: var(--paper-card);
  border: 1px solid var(--grid);
  border-radius: var(--radius);
  padding: 1.1rem 1.2rem;
  box-shadow: var(--shadow);
}

.grid { display: grid; gap: 1rem; }
.grid.cols { grid-template-columns: repeat(auto-fill, minmax(258px, 1fr)); }

.tag {
  display: inline-block; padding: .1rem .5rem; margin: 0 .25rem .3rem 0;
  font-family: var(--sans); font-size: .74rem; letter-spacing: .06em;
  border: 1px solid var(--grid); border-radius: 999px; color: var(--ink-soft);
  background: var(--paper);
}
.tag.on { background: var(--cinnabar); border-color: var(--cinnabar); color: #fdfaf3; }
.tag.stage-verified { border-color: var(--jade); color: var(--jade); }
.tag.stage-corrected { border-color: var(--indigo); color: var(--indigo); }
.tag.stage-raw { border-color: var(--ink-faint); }
.tag.stage-none { border-style: dashed; }

button, .btn {
  font-family: var(--sans); font-size: .9rem; letter-spacing: .05em;
  padding: .45rem 1rem; border-radius: var(--radius);
  border: 1px solid var(--grid); background: var(--paper-card); color: var(--ink);
  cursor: pointer;
}
button:hover, .btn:hover { border-color: var(--ink-faint); }
button.primary { background: var(--cinnabar); border-color: var(--cinnabar); color: #fdfaf3; }
button.primary:hover { background: #8d2b1a; }
button[disabled] { opacity: .5; cursor: not-allowed; }
button.on { background: var(--ink); border-color: var(--ink); color: var(--paper); }

input[type="text"], input[type="search"], textarea, select {
  font-family: var(--serif); font-size: 1rem;
  padding: .5rem .7rem; width: 100%;
  background: var(--paper-card); color: var(--ink);
  border: 1px solid var(--grid); border-radius: var(--radius);
}
textarea { line-height: 1.7; resize: vertical; }

/* ---------------------------------------------------------------- 首頁 */
.hero { display: grid; gap: 1.6rem; grid-template-columns: minmax(0, 1fr) auto; align-items: start; margin-bottom: 2rem; }
@media (max-width: 800px) { .hero { grid-template-columns: 1fr; } }
.hero-vertical {
  writing-mode: vertical-rl; font-size: 1.05rem; letter-spacing: .35em;
  color: var(--ink-faint); border-right: 1px solid var(--grid); padding-right: .8rem;
  max-height: 15rem;
}
.stat-row { display: flex; flex-wrap: wrap; gap: 1.6rem; margin: 1.4rem 0; }
.stat b { display: block; font-size: 1.9rem; line-height: 1.1; letter-spacing: .02em; }
.stat span { font-family: var(--sans); font-size: .78rem; color: var(--ink-faint); letter-spacing: .1em; }

/* ---------------------------------------------------------------- 年表 */
.timeline { display: grid; gap: .5rem; }
.tl-row {
  display: grid; grid-template-columns: 5.6rem 1fr auto; gap: 1rem; align-items: baseline;
  padding: .55rem .8rem; border-bottom: 1px dashed var(--grid);
  text-decoration: none; color: inherit;
}
.tl-row:hover { background: var(--paper-card); }
.tl-year { font-family: var(--sans); font-size: .84rem; color: var(--cinnabar); letter-spacing: .05em; }
.tl-titles { color: var(--ink-soft); font-size: .95rem; }
.tl-count { font-family: var(--sans); font-size: .78rem; color: var(--ink-faint); white-space: nowrap; }

/* ---------------------------------------------------------------- 佳作卡 */
.essay-card { display: flex; flex-direction: column; gap: .5rem; text-decoration: none; color: inherit; overflow: hidden; }
.essay-card:hover { border-color: var(--ink-faint); }
.essay-thumb {
  aspect-ratio: 16 / 9; background: var(--paper-deep) center/cover no-repeat;
  border: 1px solid var(--grid-soft); border-radius: 2px;
  filter: saturate(.82);
}
.essay-card h3 { margin: 0; font-size: 1rem; }
.essay-card .excerpt { font-size: .9rem; color: var(--ink-soft); line-height: 1.7; }
.essay-card .official { font-size: .82rem; color: var(--ink-faint); border-left: 2px solid var(--cinnabar-soft); padding-left: .6rem; }

/* ---------------------------------------------------------------- 閱讀模式 */
.reader { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); gap: 1.4rem; align-items: start; }
@media (max-width: 960px) { .reader { grid-template-columns: 1fr; } }

.reader-toolbar {
  display: flex; flex-wrap: wrap; gap: .4rem; align-items: center;
  margin-bottom: 1rem; padding-bottom: .8rem; border-bottom: 1px solid var(--grid);
}
.reader-toolbar .spacer { margin-left: auto; }

.plate { position: sticky; top: 4.6rem; }
.plate-scroll { max-height: calc(100vh - 7rem); overflow: auto; border: 1px solid var(--grid); border-radius: var(--radius); background: var(--paper-card); }
.plate-scroll img { display: block; width: 100%; height: auto; transition: width .18s ease; }
.plate-scroll.zoom img { width: 220%; max-width: none; }
.plate-caption { font-family: var(--sans); font-size: .76rem; color: var(--ink-faint); padding-top: .4rem; }

.transcript { background: var(--paper-card); border: 1px solid var(--grid); border-radius: var(--radius); padding: 1.3rem 1.4rem; }
.transcript p { margin: 0 0 1.1rem; text-indent: 2em; }
.transcript p:last-child { margin-bottom: 0; }

.transcript.vertical {
  writing-mode: vertical-rl;
  height: min(72vh, 44rem);
  overflow-x: auto; overflow-y: hidden;
  line-height: 2.1;
  letter-spacing: .06em;
  background-image: linear-gradient(90deg, var(--grid-soft) 1px, transparent 1px);
  background-size: 2.1em 100%;
}
.transcript.vertical p { text-indent: 2em; margin: 0 0 1.4em 0; }

.unc { color: var(--cinnabar); border-bottom: 1px dotted var(--cinnabar); }
.illegible { color: var(--ink-faint); background: var(--paper-deep); padding: 0 .15em; }

.panel { margin-top: 1.4rem; }
.panel h3 { display: flex; align-items: baseline; gap: .6rem; }
.panel h3::after { content: ""; flex: 1; border-top: 1px solid var(--grid); }
.official-note { white-space: pre-wrap; background: var(--paper-card); border-left: 3px solid var(--cinnabar); padding: .9rem 1.1rem; border-radius: 0 var(--radius) var(--radius) 0; }

/* ---------------------------------------------------------------- 分析 */
.analysis-block { border: 1px solid var(--grid); border-radius: var(--radius); padding: 1rem 1.15rem; background: var(--paper-card); margin-bottom: 1rem; }
.analysis-block h4 { color: var(--cinnabar); letter-spacing: .12em; font-size: .85rem; font-family: var(--sans); margin-bottom: .6rem; }
.quote { border-left: 2px solid var(--grid); padding-left: .8rem; color: var(--ink-soft); margin: .4rem 0; }
.quote.ungrounded { border-left-color: var(--cinnabar); }
.link-pair { display: grid; gap: .35rem; padding: .7rem 0; border-bottom: 1px dashed var(--grid); }
.link-pair:last-child { border-bottom: 0; }
.link-pair .official-side { color: var(--cinnabar); font-size: .92rem; }
.link-pair .evidence-side { color: var(--ink); font-size: .95rem; }
.link-pair .explain { color: var(--ink-faint); font-size: .87rem; }

/* ---------------------------------------------------------------- 問學 */
.ask-out { white-space: pre-wrap; line-height: 1.9; }
.ask-out h3 { margin-top: 1.2rem; }
.chip-row { display: flex; flex-wrap: wrap; gap: .4rem; margin: .6rem 0 1rem; }

.notice { border: 1px dashed var(--cinnabar-soft); border-radius: var(--radius); padding: .7rem .9rem; color: var(--ink-soft); font-size: .88rem; }
.spinner { display: inline-block; width: .85em; height: .85em; border: 2px solid var(--grid); border-top-color: var(--cinnabar); border-radius: 50%; animation: spin .7s linear infinite; vertical-align: -.1em; }
@keyframes spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { .spinner { animation: none; } .plate-scroll img { transition: none; } }

/* ---------------------------------------------------------------- 頁尾 */
.site-foot {
  border-top: 1px solid var(--grid); padding: 1.4rem clamp(1rem, 4vw, 2.5rem) 2.4rem;
  font-size: .82rem; color: var(--ink-faint); font-family: var(--sans); line-height: 1.7;
}
.site-foot p { margin: .2rem 0; max-width: 60rem; }

table.plain { width: 100%; border-collapse: collapse; font-size: .9rem; }
table.plain th, table.plain td { text-align: left; padding: .45rem .6rem; border-bottom: 1px solid var(--grid); vertical-align: top; }
table.plain th { font-family: var(--sans); font-size: .78rem; color: var(--ink-faint); letter-spacing: .08em; font-weight: 500; }

.scroll-x { overflow-x: auto; }