/* ==========================================================================
   高一數學銜接計畫 — 共用樣式
   視覺基調：方格紙 × 藍黑鋼筆 × 紅筆訂正
   ========================================================================== */

/* ---------- tokens ---------- */
:root {
  --paper:      #F5F7F5;
  --card:       #FFFFFF;
  --ink:        #17242E;   /* 藍黑鋼筆 */
  --ink-soft:   #4A5C66;
  --ink-faint:  #7C8C93;
  --rule:       #D3DDE0;
  --grid:       #DCE6E8;   /* 方格紙格線 */
  --fill:       #23596A;   /* 補洞：青墨 */
  --fill-bg:    #E7EFF1;
  --pre:        #9A5B2E;   /* 預習：赭石 */
  --pre-bg:     #F2EAE2;
  --mark:       #B4342A;   /* 訂正紅筆 */
  --shadow:     0 1px 2px rgba(23,36,46,.06), 0 8px 24px -12px rgba(23,36,46,.18);

  --serif: "Songti TC", "Noto Serif TC", "Source Han Serif TC", "PMingLiU", Georgia, serif;
  --sans:  "PingFang TC", "Noto Sans TC", "Heiti TC", "Microsoft JhengHei", system-ui, sans-serif;
  --mono:  ui-monospace, "SF Mono", Menlo, "Cascadia Mono", monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper:#131A1E; --card:#1A2429; --ink:#E6EDEF; --ink-soft:#A8B8BE; --ink-faint:#77878D;
    --rule:#2E3D44; --grid:#263239; --fill:#6FB3C4; --fill-bg:#1D3038; --pre:#D2A075;
    --pre-bg:#322822; --mark:#E0796D;
    --shadow:0 1px 2px rgba(0,0,0,.4), 0 8px 24px -12px rgba(0,0,0,.6);
  }
}
:root[data-theme="dark"] {
  --paper:#131A1E; --card:#1A2429; --ink:#E6EDEF; --ink-soft:#A8B8BE; --ink-faint:#77878D;
  --rule:#2E3D44; --grid:#263239; --fill:#6FB3C4; --fill-bg:#1D3038; --pre:#D2A075;
  --pre-bg:#322822; --mark:#E0796D;
  --shadow:0 1px 2px rgba(0,0,0,.4), 0 8px 24px -12px rgba(0,0,0,.6);
}
:root[data-theme="light"] {
  --paper:#F5F7F5; --card:#FFFFFF; --ink:#17242E; --ink-soft:#4A5C66; --ink-faint:#7C8C93;
  --rule:#D3DDE0; --grid:#DCE6E8; --fill:#23596A; --fill-bg:#E7EFF1; --pre:#9A5B2E;
  --pre-bg:#F2EAE2; --mark:#B4342A;
  --shadow:0 1px 2px rgba(23,36,46,.06), 0 8px 24px -12px rgba(23,36,46,.18);
}

/* ---------- reset & base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.75;
}
img { max-width: 100%; height: auto; }

h1, h2, h3, h4 { font-family: var(--serif); font-weight: 600; text-wrap: balance; line-height: 1.32; margin: 0; }
h1 { font-size: 30px; letter-spacing: .01em; }
h2 { font-size: 22px; }
h3 { font-size: 17px; }
p  { margin: 0; max-width: 66ch; }
a  { color: var(--fill); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { color: var(--mark); }
a:focus-visible, button:focus-visible { outline: 2px solid var(--fill); outline-offset: 2px; border-radius: 2px; }

.eyebrow {
  font-family: var(--mono); font-size: 11px; letter-spacing: .16em;
  text-transform: uppercase; color: var(--ink-faint);
}

/* ---------- layout ---------- */
.wrap { max-width: 1000px; margin: 0 auto; padding: 0 22px; }
main.wrap { padding-bottom: 90px; display: flex; flex-direction: column; gap: 40px; }
.stack { display: flex; flex-direction: column; gap: 14px; }
.stack-lg { display: flex; flex-direction: column; gap: 26px; }
.grid2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(285px, 1fr)); gap: 26px; }
.rule-top { border-top: 1px solid var(--rule); padding-top: 26px; }
.scroll { overflow-x: auto; }

/* ---------- site header ---------- */
.site-head {
  border-bottom: 1px solid var(--rule);
  background: var(--card);
  position: sticky; top: 0; z-index: 10;
}
.site-head .wrap {
  display: flex; align-items: center; gap: 10px 26px; flex-wrap: wrap;
  padding-top: 13px; padding-bottom: 13px;
}
.brand {
  font-family: var(--serif); font-size: 16.5px; font-weight: 600;
  color: var(--ink); text-decoration: none; white-space: nowrap;
}
.brand:hover { color: var(--ink); }
.brand .dot { color: var(--mark); }
.site-nav { display: flex; gap: 18px; flex-wrap: wrap; margin-right: auto; }
.site-nav a {
  font-size: 13.5px; color: var(--ink-soft); text-decoration: none;
  padding-bottom: 2px; border-bottom: 1.5px solid transparent;
}
.site-nav a:hover { color: var(--ink); border-bottom-color: var(--rule); }
.site-nav a[aria-current="page"] { color: var(--ink); border-bottom-color: var(--mark); font-weight: 600; }

.theme-btn {
  font: inherit; font-size: 12px; font-family: var(--mono);
  background: none; color: var(--ink-faint); border: 1px solid var(--rule);
  border-radius: 2px; padding: 4px 10px; cursor: pointer; white-space: nowrap;
}
.theme-btn:hover { color: var(--ink); border-color: var(--ink-faint); }

/* ---------- page hero ---------- */
.hero { padding-top: 46px; display: flex; flex-direction: column; gap: 13px; }
.hero .lede { font-size: 17px; color: var(--ink-soft); max-width: 60ch; }
.hero-rule { border-bottom: 2px solid var(--ink); padding-bottom: 16px; }

/* ---------- cards ---------- */
.card {
  background: var(--card); border: 1px solid var(--rule); border-radius: 3px;
  padding: 22px 24px; display: flex; flex-direction: column; gap: 11px;
}
.card.accent-fill { border-left: 3px solid var(--fill); }
.card.accent-pre  { border-left: 3px solid var(--pre); }
.card.accent-mark { border-left: 3px solid var(--mark); }

/* ---------- tables ---------- */
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; padding: 9px 11px; border-bottom: 1px solid var(--rule); vertical-align: top; }
thead th {
  font-family: var(--mono); font-size: 10.5px; letter-spacing: .1em; text-transform: uppercase;
  color: var(--ink-faint); font-weight: 500; border-bottom: 1.5px solid var(--ink); white-space: nowrap;
}
td.num, th.num { font-family: var(--mono); font-variant-numeric: tabular-nums; white-space: nowrap; }
tbody tr:last-child td { border-bottom: none; }

/* fill-in rows */
.track td { height: 26px; }
.track td.blank {
  background-image: linear-gradient(to right, var(--grid) 0 100%);
  background-size: 100% 1px; background-position: 0 100%; background-repeat: no-repeat;
}

/* ---------- lists ---------- */
ul, ol { padding-left: 1.2em; margin: 0; display: flex; flex-direction: column; gap: 7px; }
li::marker { color: var(--ink-faint); }

/* ---------- inline bits ---------- */
.tag {
  display: inline-block; font-family: var(--mono); font-size: 10px; letter-spacing: .08em;
  padding: 2px 7px; border-radius: 2px; background: var(--fill-bg); color: var(--fill); white-space: nowrap;
}
.tag.pre  { background: var(--pre-bg); color: var(--pre); }
.tag.mark { background: transparent; color: var(--mark); border: 1px solid currentColor; }

.callout {
  border-left: 3px solid var(--mark); padding: 10px 0 10px 16px;
  font-size: 14.5px; color: var(--ink-soft);
}
.callout b { color: var(--ink); }

.swatch { display: inline-block; width: 10px; height: 10px; border-radius: 1px; vertical-align: -1px; margin-right: 6px; }
.legend { display: flex; flex-wrap: wrap; gap: 7px 24px; font-size: 12.5px; color: var(--ink-soft); }
.legend b { font-weight: 600; color: var(--ink); }

.btn {
  font: inherit; font-size: 14px; font-family: var(--sans);
  background: var(--ink); color: var(--paper); border: none; border-radius: 2px;
  padding: 10px 20px; cursor: pointer; text-decoration: none; display: inline-block;
}
.btn:hover { opacity: .87; color: var(--paper); }
.btn.ghost { background: none; color: var(--ink); border: 1px solid var(--rule); }
.btn.ghost:hover { border-color: var(--ink-faint); opacity: 1; }
.btn-row { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
.hint { font-size: 13px; color: var(--ink-faint); }

sup { font-size: .72em; vertical-align: super; line-height: 0; }
.rad { text-decoration: overline; text-decoration-thickness: 1px; }
.math { font-family: var(--mono); font-size: 13.5px; }

/* ---------- calendar ---------- */
.cal { display: grid; grid-template-columns: 36px repeat(7, 1fr); gap: 3px; }
.cal .dow {
  grid-column: 2 / -1; display: grid; grid-template-columns: repeat(7, 1fr); gap: 3px;
  font-family: var(--mono); font-size: 10px; letter-spacing: .12em; color: var(--ink-faint);
  text-align: center; padding-bottom: 3px;
}
.wk-label {
  display: flex; align-items: center; justify-content: center;
  font-family: var(--mono); font-size: 10px; letter-spacing: .1em; color: var(--ink-faint);
  writing-mode: vertical-rl; padding: 4px 0;
}
.day {
  border: 1px solid var(--rule); border-radius: 2px; padding: 6px 7px 7px;
  min-height: 104px; display: flex; flex-direction: column; gap: 4px;
  background-color: var(--card);
  background-image: linear-gradient(var(--grid) 1px, transparent 1px);
  background-size: 100% 13px; background-position: 0 24px;
}
.day .d { font-family: var(--mono); font-size: 13.5px; font-weight: 600; font-variant-numeric: tabular-nums; line-height: 1; }
.day .d span { font-size: 10px; font-weight: 400; color: var(--ink-faint); margin-left: 3px; }
.day .t { font-size: 12px; font-weight: 600; line-height: 1.35; }
.day .n { font-size: 11px; color: var(--ink-soft); line-height: 1.38; }
.day .box { margin-top: auto; display: flex; gap: 4px; font-family: var(--mono); font-size: 9px; color: var(--ink-faint); }
.day .box i { font-style: normal; border: 1px solid var(--rule); border-radius: 1px; padding: 1px 4px; }
.day.w-fill { border-left: 3px solid var(--fill); }
.day.w-pre  { border-left: 3px solid var(--pre); }
.day.rest   { background-color: var(--fill-bg); }
.day.rest.w-pre { background-color: var(--pre-bg); }
.day.key .d, .day.key .t { color: var(--mark); }

/* ---------- hand-plot graph paper ---------- */
.plot { display: grid; grid-template-columns: 42px 1fr; gap: 0 9px; }
.plot .yax {
  display: flex; flex-direction: column; justify-content: space-between;
  font-family: var(--mono); font-size: 10px; color: var(--ink-faint); text-align: right;
}
.plot .grid-area {
  height: 155px; border: 1px solid var(--rule); background-color: var(--card);
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 100% 25px, 3.3333% 100%;
}
.plot .xax {
  grid-column: 2; display: flex; justify-content: space-between;
  font-family: var(--mono); font-size: 10px; color: var(--ink-faint); padding-top: 4px;
}

/* ---------- diagnostic paper ---------- */
.qsec { display: flex; flex-direction: column; gap: 10px; break-inside: avoid; }
.qsec-head { display: flex; align-items: baseline; gap: 12px; border-bottom: 1px solid var(--ink); padding-bottom: 5px; }
.qsec-head .meta { font-family: var(--mono); font-size: 10.5px; color: var(--ink-faint); margin-left: auto; }
.qlist {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 5px 26px; list-style: none; padding: 0; font-size: 14px;
}
.qlist li { display: flex; gap: 8px; padding: 2px 0; }
.qlist .id { font-family: var(--mono); font-size: 11.5px; color: var(--ink-faint); flex: none; padding-top: 2px; }
.ans { font-size: 13px; }
/* 答案固定三欄 —— 交給 .grid2 的話，列印寬度下只排得下兩欄，整塊會被拉長超過一頁 */
.ans-cols { display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px 26px; }
@media (max-width: 640px) { .ans-cols { grid-template-columns: repeat(2, 1fr); } }

/* ---------- footer ---------- */
.site-foot {
  border-top: 1px solid var(--rule); margin-top: 20px;
  font-size: 13px; color: var(--ink-faint);
}
.site-foot .wrap { padding-top: 26px; padding-bottom: 46px; display: flex; flex-direction: column; gap: 8px; }

/* ---------- printable sheets ---------- */
.sheet {
  background: var(--card); border: 1px solid var(--rule); border-radius: 3px;
  box-shadow: var(--shadow); padding: 30px 30px 34px;
  display: flex; flex-direction: column; gap: 20px;
}
.sheet-head { border-bottom: 2px solid var(--ink); padding-bottom: 12px; display: flex; flex-direction: column; gap: 5px; }
.sheet-head .sub { color: var(--ink-soft); font-size: 14px; }
.sheet table { font-size: 12.5px; }
.sheet th, .sheet td { padding: 6px 8px; }
.sheet ul, .sheet ol { font-size: 13px; gap: 5px; }
.sheet p { font-size: 13px; }
.sheet .qlist { font-size: 13px; gap: 4px 22px; grid-template-columns: repeat(auto-fit, minmax(215px, 1fr)); }
.sheet .math { font-size: 12.5px; }
.sheet .day { min-height: 96px; }

/* ---------- print ---------- */
@page { size: A4; margin: 11mm; }
@media print {
  :root {
    --paper:#fff; --card:#fff; --ink:#000; --ink-soft:#333; --ink-faint:#666;
    --rule:#B8C4C8; --grid:#E2E8EA; --fill:#1B4C5B; --fill-bg:#EDF3F4;
    --pre:#7E4A22; --pre-bg:#F5EEE7; --mark:#9C2A20; --shadow:none;
  }
  * { -webkit-print-color-adjust: exact; print-color-adjust: exact; }
  body { font-size: 10.2pt; background: #fff; }
  .wrap, main.wrap { max-width: none; padding: 0; gap: 0; }
  .site-head, .site-foot, .no-print { display: none !important; }
  .sheet {
    border: none; box-shadow: none; padding: 0;
    break-after: page; page-break-after: always;
  }
  .sheet:last-child { break-after: auto; page-break-after: auto; }
  h1 { font-size: 17pt; } h2 { font-size: 13pt; } h3 { font-size: 10.5pt; }
  .day { min-height: 82px; }
  .qsec { page-break-inside: avoid; }
  /* 收緊需要手寫的表格與方格圖，讓每張 sheet 剛好落在一頁 A4 */
  .track td { height: 23px; }
  .plot .grid-area { height: 110px; background-size: 100% 22px, 3.3333% 100%; }
  a { color: #000; text-decoration: none; }
}

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

/* ---------- responsive ---------- */
@media (max-width: 720px) {
  body { font-size: 15px; }
  h1 { font-size: 25px; }
  .cal { grid-template-columns: 1fr; }
  .cal .dow { display: none; }
  .wk-label {
    writing-mode: horizontal-tb; justify-content: flex-start;
    padding: 14px 0 3px; letter-spacing: .14em; font-weight: 600; color: var(--ink);
  }
  .day { min-height: auto; }
  .site-head { position: static; }
  .sheet { padding: 20px 17px 24px; }
}