/* ==================================================================
   食品分析數據品管與量測不確定度教學網站 — 共用樣式
   ================================================================== */
:root {
  --c-primary: #0F4C81;      /* 經典藍 */
  --c-primary-2: #1565C0;
  --c-accent: #F6A21D;       /* 橘 */
  --c-green: #2E7D32;
  --c-red: #C62828;
  --c-bg: #F4F7FB;
  --c-card: #FFFFFF;
  --c-ink: #1F2937;
  --c-muted: #64748B;
  --c-line: #E2E8F0;
  --radius: 14px;
  --shadow: 0 2px 10px rgba(15, 40, 80, .08);
  --mono: "Cascadia Code", "Consolas", "JetBrains Mono", monospace;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--c-bg); color: var(--c-ink);
  font-family: "Segoe UI", "Microsoft JhengHei", "PingFang TC", sans-serif;
  line-height: 1.85; font-size: 16.5px;
}

/* ---------- 頂部導覽 ---------- */
.topbar {
  position: sticky; top: 0; z-index: 50;
  background: linear-gradient(90deg, var(--c-primary), var(--c-primary-2));
  color: #fff; box-shadow: var(--shadow);
}
.topbar .inner {
  max-width: 1180px; margin: 0 auto; padding: 10px 18px;
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
}
.brand { font-weight: 700; font-size: 1.05rem; color: #fff; text-decoration: none; white-space: nowrap; }
.brand small { display: block; font-weight: 400; opacity: .8; font-size: .72rem; letter-spacing: .5px; }
.topnav { display: flex; gap: 2px; flex-wrap: wrap; }
.topnav a {
  color: #E3EDF8; text-decoration: none; font-size: .88rem;
  padding: 4px 10px; border-radius: 8px; transition: .15s;
}
.topnav a:hover { background: rgba(255,255,255,.18); color: #fff; }
.topnav a.active { background: var(--c-accent); color: #1a1a1a; font-weight: 600; }

/* ---------- 版面 ---------- */
main { max-width: 1180px; margin: 0 auto; padding: 26px 18px 60px; }
.crumbs { color: var(--c-muted); font-size: .85rem; margin-bottom: 6px; }
h1 {
  font-size: 2rem; line-height: 1.3; margin: 6px 0 4px;
  color: var(--c-primary);
}
h1 .en { display: block; font-size: .95rem; color: var(--c-muted); font-weight: 400; margin-top: 4px; }
.lede { font-size: 1.08rem; color: var(--c-ink); line-height: 1.7; margin: 10px 0 14px;
  padding: 12px 16px; background: #F4F8FC; border-left: 4px solid var(--c-primary); border-radius: 0 10px 10px 0; }
h2 {
  margin: 2.2em 0 .6em; padding-left: 12px;
  border-left: 6px solid var(--c-accent); font-size: 1.45rem; color: #123;
}
h3 { margin: 1.6em 0 .4em; font-size: 1.15rem; color: var(--c-primary-2); }
p { margin: .6em 0; }
strong { color: #0c3a5f; }
hr { border: none; border-top: 1px dashed var(--c-line); margin: 2em 0; }

/* ---------- 卡片與提示框 ---------- */
.card {
  background: var(--c-card); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 20px 24px; margin: 18px 0;
}
.goals {
  background: linear-gradient(135deg, #E8F1FB, #F0F7FF);
  border: 1px solid #C9DDF3; border-radius: var(--radius);
  padding: 14px 20px; margin: 16px 0;
}
.goals b { color: var(--c-primary); }
.callout {
  border-radius: var(--radius); padding: 14px 18px; margin: 16px 0;
  border-left: 6px solid var(--c-primary-2); background: #EEF5FE;
}
.callout.warn { border-color: var(--c-accent); background: #FEF6E7; }
.callout.danger { border-color: var(--c-red); background: #FDECEC; }
.callout.ok { border-color: var(--c-green); background: #EDF7EE; }
.callout .t { font-weight: 700; margin-right: 6px; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
@media (max-width: 860px) { .grid2 { grid-template-columns: 1fr; } }

/* ---------- 公式 ---------- */
.formula {
  background: #F8FAFD; border: 1px solid var(--c-line);
  border-radius: 10px; padding: 12px 16px; margin: 14px 0;
  text-align: center; font-size: 1.12rem;
  font-family: Cambria, "Times New Roman", "STIX Two Math", serif;
  overflow-x: auto;
}
.formula .note { display: block; font-size: .82rem; color: var(--c-muted);
  font-family: "Segoe UI", "Microsoft JhengHei", sans-serif; margin-top: 4px; }
.frac { display: inline-block; vertical-align: middle; text-align: center; margin: 0 3px; }
.frac .num { display: block; padding: 0 6px; border-bottom: 1.5px solid var(--c-ink); }
.frac .den { display: block; padding: 0 6px; }
/* 根號：√ 後面接 .rad 內容，用 border-top 畫出跨整段的根號橫線 */
.rad { display: inline-block; border-top: 1.5px solid var(--c-ink);
  padding: 0 3px; margin-top: -1px; }
var { font-style: italic; font-family: inherit; }

/* ---------- 表格 ---------- */
table { border-collapse: collapse; width: 100%; margin: 14px 0; background: #fff;
  border-radius: 10px; overflow: hidden; font-size: .95rem; }
th { background: var(--c-primary); color: #fff; padding: 9px 12px; text-align: left; }
td { padding: 8px 12px; border-bottom: 1px solid var(--c-line); }
tr:nth-child(even) td { background: #F6F9FD; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }
.hl td { background: #FFF8E8 !important; }

/* ---------- R 程式碼區塊 ---------- */
.rcodewrap { margin: 18px 0; border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow); background: #0F2233; }
.rcodehead {
  display: flex; align-items: center; gap: 10px;
  background: #16324B; color: #BFD7EE; padding: 8px 14px; font-size: .85rem;
}
.rcodehead .fname { font-family: var(--mono); color: #8FD3FF; }
.rcodehead .spacer { flex: 1; }
.rcodehead button {
  background: var(--c-accent); border: none; color: #1a1a1a;
  padding: 4px 12px; border-radius: 7px; cursor: pointer; font-size: .8rem;
  font-weight: 600;
}
.rcodehead button.ghost { background: #2A4A68; color: #D8E9F8; }
.rcodehead button:hover { filter: brightness(1.1); }
pre.rcode {
  margin: 0; padding: 16px 18px; overflow-x: auto;
  color: #DCEBF7; font-family: var(--mono); font-size: .86rem; line-height: 1.65;
  tab-size: 2;
}
pre.rcode .cm { color: #7FA3BF; }        /* 註解 */
pre.rcode .st { color: #A5D6A7; }        /* 字串 */
pre.rcode .kw { color: #FFCC80; }        /* 關鍵字/函數 */
pre.rcode .out { color: #9FCBEA; font-style: italic; }

/* ---------- R 執行輸出（console 風） ---------- */
.rout { margin: 2px 0 20px; border-radius: 10px; overflow: hidden;
  box-shadow: var(--shadow); background: #0A1B29; }
.routhead { display: flex; align-items: center; gap: 8px;
  background: #10283C; color: #9FC4DE; padding: 6px 14px; font-size: .82rem;
  border-bottom: 1px solid #16324B; }
.routhead .dot { width: 9px; height: 9px; border-radius: 50%; background: #4CAF7D; }
.routhead .term { font-family: var(--mono); color: #7FB6D9; }
.routhead .spacer { flex: 1; }
.routhead .tag { background: #16324B; padding: 1px 9px; border-radius: 9px; font-size: .75rem; }
pre.rout-body { margin: 0; padding: 13px 18px; overflow-x: auto;
  color: #E6F1FA; font-family: var(--mono); font-size: .86rem; line-height: 1.7; tab-size: 2; }
pre.rout-body .prompt { color: #6FD3A7; font-weight: 700; }

/* ---------- 圖片 ---------- */
.figure { text-align: center; margin: 20px 0; overflow-x: auto; -webkit-overflow-scrolling: touch; }
.figure img { max-width: 100%; border-radius: 10px; box-shadow: var(--shadow); background: #fff; }
.figure .cap { color: var(--c-muted); font-size: .88rem; margin-top: 8px; }
@media (max-width: 768px) {
  .figure img.wide-img { max-width: none; width: 700px; margin: 0 auto; display: block; }
}

/* ---------- 測驗 ---------- */
.quizbox {
  background: var(--c-card); border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 22px 26px; margin: 26px 0;
}
.quizbox h2 { margin-top: 0; }
.qitem { margin: 18px 0; padding: 14px 16px; border: 1px solid var(--c-line); border-radius: 12px; }
.qitem .qtext { font-weight: 600; margin-bottom: 8px; }
.qitem label { display: block; padding: 7px 12px; border-radius: 8px; cursor: pointer; margin: 3px 0; }
.qitem label:hover { background: #F0F6FF; }
.qitem input { margin-right: 8px; }
.qitem.correct label.sel { background: #E3F5E5; outline: 2px solid var(--c-green); }
.qitem.wrong label.sel { background: #FDE8E8; outline: 2px solid var(--c-red); }
.qitem .exp {
  display: none; margin-top: 10px; padding: 10px 14px;
  background: #FFF9EC; border-left: 4px solid var(--c-accent);
  border-radius: 8px; font-size: .93rem;
}
.qitem.answered .exp { display: block; }
.qbtn {
  background: var(--c-primary-2); color: #fff; border: none; font-size: 1rem;
  padding: 10px 26px; border-radius: 10px; cursor: pointer; font-weight: 600;
}
.qbtn:hover { background: var(--c-primary); }
.qscore { font-size: 1.15rem; font-weight: 700; margin-top: 14px; }
.qscore.good { color: var(--c-green); }
.qscore.mid { color: var(--c-accent); }
.qscore.low { color: var(--c-red); }
/* 測驗 v2：學號閘門、把握程度、數值題、回溯題、我還不懂的地方 */
.quizpre { border-left: 6px solid var(--c-accent); }
.qgate { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin: 6px 0 14px; }
.qgate-l { font-weight: 600; }
.qgate .qsid, .qnum-in {
  font: inherit; padding: 8px 12px; border: 2px solid var(--c-line); border-radius: 10px; width: 12em; max-width: 100%;
}
.qgate .qsid:focus, .qnum-in:focus, .qmuddy textarea:focus { outline: none; border-color: var(--c-primary-2); }
.qgate-err { color: var(--c-red); font-size: .9rem; flex-basis: 100%; min-height: 1em; }
.qnote { flex-basis: 100%; margin: 0; font-size: .85rem; color: var(--c-muted); line-height: 1.6; }
.qwho { font-weight: 600; color: var(--c-primary); }
.qlink {
  background: none; border: none; padding: 0; font: inherit; font-size: .88rem;
  color: var(--c-primary-2); text-decoration: underline; cursor: pointer;
}
.qitem label.key { outline: 2px solid var(--c-green); background: #E3F5E5; }
.qitem .qnum { display: block; }
.qitem .qnum:hover { background: none; }
.qkey { margin-top: 8px; font-weight: 600; color: var(--c-green); }
.qconf { display: flex; align-items: center; flex-wrap: wrap; gap: 4px; margin-top: 8px; font-size: .85rem; color: var(--c-muted); }
.qitem .qconf label {
  display: inline-block; margin: 0; padding: 2px 10px; border: 1px solid var(--c-line); border-radius: 999px;
}
.qitem .qconf label:has(input:checked) { background: #D6E7F8; border-color: var(--c-primary-2); color: var(--c-primary); }
.qitem .qconf input { margin-right: 4px; }
.qspaced { margin: 26px 0 0; font-size: 1.05rem; color: var(--c-primary); }
.qwarn { color: #8A5A00; font-size: .92rem; margin: 6px 0; min-height: 1em; }
.qbtn.ghost { background: #fff; color: var(--c-primary-2); border: 2px solid var(--c-primary-2); padding: 7px 18px; font-size: .92rem; }
.qbtn.ghost:hover { background: #F0F6FF; }
.qmuddy { margin-top: 26px; padding-top: 18px; border-top: 1px dashed var(--c-line); }
.qmuddy textarea {
  display: block; width: 100%; margin: 8px 0; padding: 10px 12px; font: inherit;
  border: 2px solid var(--c-line); border-radius: 10px; resize: vertical;
}
.qmuddy-msg, .qsync { font-size: .88rem; color: var(--c-muted); }
.qfoot { margin-top: 16px; }
.qbtn:focus-visible, .qlink:focus-visible, .qitem input:focus-visible, .navtoggle:focus-visible {
  outline: 3px solid var(--c-accent); outline-offset: 2px;
}

/* 手機版：章節導覽收合 */
.navtoggle { display: none; }
@media (max-width: 900px) {
  .navtoggle {
    display: inline-block; margin-left: auto; font: inherit; font-size: .9rem; font-weight: 600;
    background: rgba(255,255,255,.16); color: #fff; border: 1px solid rgba(255,255,255,.4);
    border-radius: 8px; padding: 5px 12px; cursor: pointer;
  }
  .topnav { display: none; flex-basis: 100%; }
  .topnav.open { display: flex; }
  .topnav a { flex: 1 1 45%; padding: 8px 10px; }
}

/* ---------- 上下頁 ---------- */
.pager { display: flex; justify-content: space-between; margin-top: 34px; gap: 12px; }
.pager a {
  text-decoration: none; color: var(--c-primary-2); font-weight: 600;
  background: #fff; padding: 12px 18px; border-radius: 12px; box-shadow: var(--shadow);
  max-width: 48%;
}
.pager a:hover { color: var(--c-accent); }
.pager a small { display: block; color: var(--c-muted); font-weight: 400; }

footer { text-align: center; color: var(--c-muted); font-size: .85rem; padding: 30px 0 40px; }
.badge { display: inline-block; background: var(--c-accent); color: #1a1a1a;
  border-radius: 999px; font-size: .75rem; padding: 2px 10px; font-weight: 700; vertical-align: middle; }
.badge.blue { background: #D6E7F8; color: var(--c-primary); }
.tag-row { display: flex; gap: 8px; flex-wrap: wrap; margin: 10px 0; }
.kbd { font-family: var(--mono); background: #EEF2F7; border: 1px solid var(--c-line);
  border-bottom-width: 2px; border-radius: 6px; padding: 0 6px; font-size: .85em; }

/* 首頁章節卡 */
.chapgrid { display: grid; grid-template-columns: repeat(auto-fill, minmax(255px, 1fr)); gap: 16px; }
.chapcard {
  background: #fff; border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 18px 20px; text-decoration: none; color: var(--c-ink);
  border-top: 5px solid var(--c-primary-2); transition: .15s; display: block;
}
.chapcard:hover { transform: translateY(-3px); box-shadow: 0 6px 18px rgba(15,40,80,.14); }
.chapcard .no { color: var(--c-accent); font-weight: 800; font-size: .9rem; }
.chapcard h3 { margin: 4px 0 6px; font-size: 1.05rem; }
.chapcard p { color: var(--c-muted); font-size: .86rem; margin: 0; }
.chapcard.part2 { border-top-color: var(--c-green); }
.chapcard.part3 { border-top-color: var(--c-red); }
.chapcard.part1b { border-top-color: var(--c-accent); }
.chapcard.part4 { border-top-color: #6A3FA0; }
@media print { .topbar, .pager, footer { display: none; } body { background: #fff; } }

/* 參考文獻 */
ol.refs { padding-left: 22px; font-size: .93rem; }
ol.refs li { margin: 8px 0; }
ol.refs a { color: var(--c-primary-2); word-break: break-all; }

sub, sup { font-size: 0.8em; line-height: 0; position: relative; vertical-align: baseline; }
sub { bottom: -0.25em; }
sup { top: -0.4em; }

/* Excel 活頁簿下載 */
.xldl { margin: 8px 0 12px; }
.xlbtn { display: inline-block; background: #1D6F42; color: #fff; text-decoration: none; font-weight: 600;
  padding: 6px 14px; border-radius: 8px; margin-right: 8px; }
.xlbtn:hover { background: #155232; }

/* ---------- 章內小遊戲（assets/js/games.js） ---------- */
.gamebox {
  background: var(--c-card); border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 20px 24px; margin: 26px 0; border-top: 5px solid #6A3FA0;
}
.gamehead { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 4px; }
.gamehead h3 { margin: 0; font-size: 1.2rem; color: #4A2A80; }
.badge.game { background: #EFE6FA; color: #4A2A80; }
.gwho { flex-basis: 100%; font-size: .86rem; color: var(--c-muted); }
.gintro { margin: 6px 0 10px; }
.gpanel { margin-top: 16px; padding: 14px 16px; border-radius: 12px; background: #F7F4FC; border: 1px solid #E3D9F3; }
.gpanel h4 { margin: 0 0 8px; color: #4A2A80; font-size: 1.05rem; }
.gpanel table { margin: 8px 0 12px; }
.gctrl { display: flex; gap: 10px 18px; flex-wrap: wrap; align-items: center; margin: 8px 0; font-size: .93rem; }
.gctrl select { font: inherit; padding: 4px 8px; border: 2px solid var(--c-line); border-radius: 8px; background: #fff; }
.gctrl label { display: inline-flex; align-items: center; gap: 4px; }
.gsvg { width: 100%; height: auto; display: block; background: #fff; border-radius: 10px; border: 1px solid var(--c-line); margin: 8px 0; }
.gstats { display: grid; grid-template-columns: repeat(auto-fit, minmax(110px, 1fr)); gap: 8px; margin: 10px 0; }
.gstat { background: #fff; border: 1px solid var(--c-line); border-radius: 10px; padding: 6px 10px; text-align: center; }
.gstat b { display: block; font-size: 1.25rem; color: var(--c-primary); font-variant-numeric: tabular-nums; }
.gstat span { font-size: .78rem; color: var(--c-muted); }
.gstat.bad b { color: var(--c-red); }
.gstat.ok b { color: var(--c-green); }
.gsvgwrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.gtablewrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.gtablewrap table { min-width: 340px; }
.gtable { font-size: .9rem; }
.gtable td, .gtable th { padding: 5px 10px; }
.gverdict { font-weight: 600; margin: 10px 0 4px; }
.gbtn-row { display: flex; gap: 10px; flex-wrap: wrap; margin: 10px 0; }
.gamebox .qitem input[type=checkbox] { margin-right: 8px; }
@media (max-width: 600px) { .gamebox, .gpanel { padding-left: 14px; padding-right: 14px; } }
.gchips { display: flex; gap: 8px; flex-wrap: wrap; margin: 6px 0 10px; }
.gchip {
  font: inherit; font-variant-numeric: tabular-nums; padding: 4px 12px; border-radius: 999px; cursor: pointer;
  background: #fff; border: 2px solid var(--c-line); color: var(--c-ink);
}
.gchip:hover { border-color: var(--c-primary-2); }
.gchip.sel { background: #FFF1D6; border-color: var(--c-accent); font-weight: 700; }
.gchip.key { outline: 2px solid var(--c-green); outline-offset: 1px; }
.gchip:disabled { cursor: default; }
.gdec { display: flex; flex-wrap: wrap; gap: 4px 14px; margin: 4px 0; }
.gamebox .gdec label { display: inline-flex; align-items: center; margin: 0; padding: 5px 10px; }
.qkeybox { margin-top: 8px; }
.qkeybox table { margin: 0 0 8px; }
.qkeybox th { width: 9em; background: #EEF2F7; color: var(--c-ink); text-align: left; font-weight: 600; }
.ggrid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 8px 0; }
@media (max-width: 700px) { .ggrid2 { grid-template-columns: 1fr; } }
.gslider { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin: 10px 0 4px; font-weight: 600; }
.gslider input[type=range] { flex: 1 1 200px; max-width: 420px; accent-color: var(--c-primary-2); }
.gslider output { font-variant-numeric: tabular-nums; color: var(--c-primary); min-width: 6.5em; }
.gcardinfo { display: block; font-weight: 400; color: var(--c-ink); margin-top: 4px; }