:root {
  --bg:      #fdf7ee;
  --card:    #fffdf9;
  --ink:     #2b2a26;
  --ink2:    #4a4740;
  --muted:   #857f74;
  --line:    #e6ddcd;
  --accent:  #d9702f;
  --accent2: #2f8f83;
  --acc-bg:  #fdeee3;
  --ok:      #3d8a4f;
  --warn-bg: #fdf4e0;
  --warn-ln: #d19a2f;
  --zhuyin:  #6f675c;   /* 注音專用：比 --muted 深，小字才讀得清楚 */
  --radius: 14px;
  --shadow: 0 1px 2px rgba(40,30,10,.05), 0 6px 18px rgba(40,30,10,.06);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #191b1f; --card: #22252a; --ink: #e9e6df; --ink2: #cbc7bf;
    --muted: #948e84; --line: #343941; --acc-bg: #33261e;
    --warn-bg: #33290f; --shadow: 0 1px 2px rgba(0,0,0,.3), 0 6px 18px rgba(0,0,0,.35); --zhuyin: #a49d92;
  }
}
:root[data-theme="dark"] {
  --bg: #191b1f; --card: #22252a; --ink: #e9e6df; --ink2: #cbc7bf;
  --muted: #948e84; --line: #343941; --acc-bg: #33261e;
  --warn-bg: #33290f; --shadow: 0 1px 2px rgba(0,0,0,.3), 0 6px 18px rgba(0,0,0,.35); --zhuyin: #a49d92;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 4.2rem; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", -apple-system,
               BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  font-size: 17px;
  line-height: 2;
  letter-spacing: .01em;
}

.wrap { max-width: 980px; margin: 0 auto; padding: 0 1.15rem; }

/* ── Hero ─────────────────────────────── */
.hero {
  background: linear-gradient(155deg, #f2a35a 0%, #d9702f 48%, #b8542a 100%);
  color: #fff8ef;
  padding: 3rem 0 2.5rem;
}
.hero .kicker {
  margin: 0 0 .6rem; font-size: .8rem; letter-spacing: .16em;
  font-weight: 700; color: #ffe6cc;
}
.hero h1 {
  margin: 0 0 .9rem; font-weight: 800;
  font-size: clamp(1.9rem, 6vw, 2.9rem); line-height: 1.3;
}
.hero .lede { margin: 0 0 1.5rem; color: #fff1e0; font-size: clamp(.98rem, 2.2vw, 1.06rem); }
.hero .lede strong { color: #fff; }

.progress {
  background: rgba(255,255,255,.16);
  border: 1px solid rgba(255,255,255,.28);
  border-radius: var(--radius);
  padding: .85rem 1rem;
  max-width: 30rem;
  line-height: 1.5;
}
.plevel { display: flex; align-items: center; gap: .75rem; margin-bottom: .6rem; }
.pbadge { font-size: 1.7rem; line-height: 1; }
.plevel strong { display: block; font-size: 1.02rem; }
.plevel span { font-size: .84rem; color: #ffe6cc; }
.pbar { height: 9px; background: rgba(255,255,255,.22); border-radius: 99px; overflow: hidden; }
.pfill { height: 100%; width: 0; background: #fff; border-radius: 99px; transition: width .35s ease; }

/* ── 導覽 ─────────────────────────────── */
.toc {
  position: sticky; top: 0; z-index: 40;
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.toc .wrap {
  display: flex; gap: .25rem; overflow-x: auto; scrollbar-width: none;
  padding-top: .4rem; padding-bottom: .4rem;
}
.toc .wrap::-webkit-scrollbar { display: none; }
.toc a {
  flex: 0 0 auto; padding: .3rem .7rem; border-radius: 99px;
  color: var(--ink2); text-decoration: none; font-size: .9rem; font-weight: 600; white-space: nowrap;
}
.toc a:hover { background: var(--acc-bg); color: var(--accent); }

/* ── 區塊 ─────────────────────────────── */
main { padding-bottom: 2rem; }
section { padding: 2.5rem 0; border-bottom: 1px solid var(--line); }

h2 {
  margin: 0 0 1rem; font-size: clamp(1.3rem, 3.5vw, 1.6rem); line-height: 1.5;
  position: relative; padding-left: .8rem; font-weight: 800;
}
h2::before {
  content: ""; position: absolute; left: 0; top: .32em;
  width: 5px; height: 1em; border-radius: 3px; background: var(--accent);
}
h3 { font-size: 1.05rem; margin: 0 0 .5rem; font-weight: 700; }
p { margin: 0 0 1rem; }
b, strong { font-weight: 700; }
b { color: var(--accent); }
.intro, .dim { color: var(--muted); }
.note {
  font-size: .9rem; color: var(--muted);
  border-left: 3px solid var(--line); padding-left: .8rem;
}
.small { font-size: .85rem; color: var(--muted); line-height: 1.8; }

.highlight {
  background: var(--acc-bg); border-left: 5px solid var(--accent);
  border-radius: 0 var(--radius) var(--radius) 0; padding: 1rem 1.1rem; margin-bottom: 1.2rem;
}
.highlight p:last-child { margin-bottom: 0; }

.steps { display: grid; gap: .7rem; margin-bottom: 1rem; }
.step { display: flex; gap: .8rem; align-items: flex-start; }
.step .n {
  flex: 0 0 auto; width: 1.9rem; height: 1.9rem; margin-top: .35rem;
  display: grid; place-items: center; border-radius: 50%;
  background: var(--accent); color: #fff; font-weight: 800; font-size: .95rem;
}
.step p { margin: 0; }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: .8rem; }
.card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: .9rem 1rem;
}
.card h3 { color: var(--accent2); }
.card p { margin: 0; font-size: .94rem; }

.plain, .rules { list-style: none; padding: 0; margin: 0; }
.plain li, .rules li {
  padding: .55rem 0 .55rem 1.6rem; position: relative; border-bottom: 1px solid var(--line);
}
.plain li:last-child, .rules li:last-child { border-bottom: 0; }
.plain li::before { content: "▸"; position: absolute; left: .3rem; color: var(--accent); }
.rules li::before { content: "✓"; position: absolute; left: .2rem; color: var(--ok); font-weight: 700; }

/* ── 徽章 ─────────────────────────────── */
.badges { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: .65rem; }
.badge {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: .8rem .6rem; text-align: center; opacity: .45; filter: grayscale(1);
  transition: opacity .2s, filter .2s, border-color .2s;
}
.badge.got { opacity: 1; filter: none; border-color: var(--accent); }
.bi { display: block; font-size: 1.8rem; line-height: 1.2; }
.bn { display: block; font-weight: 700; font-size: .92rem; line-height: 1.4; }
.bh { display: block; font-size: .76rem; color: var(--muted); line-height: 1.45; margin-top: .15rem; }

.reset {
  grid-column: 1 / -1; justify-self: start; margin-top: .4rem;
  font: inherit; font-size: .85rem; padding: .35rem .9rem;
  background: transparent; color: var(--muted);
  border: 1px solid var(--line); border-radius: 99px; cursor: pointer;
}
.reset:hover { border-color: var(--accent); color: var(--accent); }

/* ── 各科 ─────────────────────────────── */
.subj { padding: 2.5rem 0; border-bottom: 1px solid var(--line); }
.shead { display: flex; align-items: center; gap: .6rem; margin-bottom: .5rem; }
.shead h2 { margin: 0; padding-left: 0; flex: 1; }
.shead h2::before { display: none; }
.sicon { font-size: 1.6rem; line-height: 1; }
.extra {
  font-size: .7rem; vertical-align: middle; padding: .1rem .5rem; border-radius: 99px;
  background: var(--acc-bg); color: var(--accent); font-weight: 700; letter-spacing: .05em;
}
.scount {
  font-size: .85rem; color: var(--muted); font-variant-numeric: tabular-nums;
  border: 1px solid var(--line); border-radius: 99px; padding: .1rem .6rem;
}
.lead { color: var(--ink2); font-size: .96rem; margin-bottom: 1.2rem; }

.group { margin-bottom: 1.4rem; }
.group h3 { color: var(--accent2); display: flex; align-items: baseline; gap: .5rem; flex-wrap: wrap; }
.gnote { font-size: .8rem; color: var(--muted); font-weight: 400; }

.reslist { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: .6rem; }

.res {
  display: flex; gap: .6rem; align-items: flex-start;
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: .8rem .9rem; text-decoration: none; color: inherit;
  transition: border-color .15s, transform .15s, box-shadow .15s;
}
.res:hover { border-color: var(--accent); transform: translateY(-2px); box-shadow: var(--shadow); }

.tick {
  flex: 0 0 auto; width: 1.15rem; height: 1.15rem; margin-top: .42rem;
  border: 2px solid var(--line); border-radius: 50%;
}
.res.done .tick { background: var(--ok); border-color: var(--ok); position: relative; }
.res.done .tick::after {
  content: ""; position: absolute; left: 50%; top: 46%;
  width: .3rem; height: .55rem; border: solid #fff; border-width: 0 2px 2px 0;
  transform: translate(-50%, -55%) rotate(45deg);
}
.res.done { border-color: color-mix(in srgb, var(--ok) 45%, var(--line)); }

.rbody { flex: 1; min-width: 0; }
.rt { display: block; font-weight: 700; font-size: 1rem; line-height: 1.6; }
.rd { display: block; font-size: .9rem; line-height: 1.85; color: var(--ink2); margin-top: .15rem; }
.rw {
  display: block; font-size: .82rem; line-height: 1.7; margin-top: .45rem;
  background: var(--warn-bg); border-left: 3px solid var(--warn-ln);
  padding: .3rem .6rem; border-radius: 0 6px 6px 0; color: var(--ink2);
}
.rtags { display: flex; flex-wrap: wrap; gap: .3rem; margin-top: .5rem; }
.tag {
  font-size: .74rem; padding: .08rem .5rem; border-radius: 99px;
  border: 1px solid var(--line); color: var(--muted); line-height: 1.7;
}
.tag.acc { color: var(--ok); border-color: color-mix(in srgb, var(--ok) 40%, var(--line)); }
.tag.acc.need { color: var(--warn-ln); border-color: color-mix(in srgb, var(--warn-ln) 45%, var(--line)); }

/* ── 純文字網址 ───────────────────────── */
.urlbox { display: grid; gap: .8rem; }
.ublock { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: .8rem 1rem; }
.ublock h4 { margin: 0 0 .4rem; font-size: .95rem; color: var(--accent2); }
.ublock pre {
  margin: 0; white-space: pre-wrap; word-break: break-all;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: .8rem; line-height: 1.75; color: var(--ink2);
}

/* ── 頁尾 ─────────────────────────────── */
footer { padding: 2rem 0 4.5rem; text-align: center; border-top: 1px solid var(--line); }
footer p { margin: 0 0 .5rem; }
footer a { color: var(--accent); }
.counter strong { color: var(--accent); font-size: 1.05rem; }

/* ── 浮動按鈕 ─────────────────────────── */
.fabs { position: fixed; right: 1rem; bottom: 1rem; z-index: 50; display: flex; flex-direction: column; gap: .5rem; }
.fab {
  padding: .55rem 1rem; border: 2px solid var(--accent); border-radius: 99px;
  background: var(--card); color: var(--accent);
  font: inherit; font-size: .88rem; font-weight: 700; cursor: pointer;
  box-shadow: 0 3px 12px rgba(0,0,0,.18); white-space: nowrap;
}
.fab:hover { background: var(--accent); color: #fff; }

/* ── 注音（直式，符號在右、聲調再右，輕聲置頂） ── */
ruby {
  display: inline-flex; align-items: center; vertical-align: baseline;
  line-height: 1; ruby-position: inter-character;
}
rt {
  position: relative; display: block;
  margin-left: .1em; padding-right: .6em;
  font-size: .34em; font-weight: 400; line-height: 1.06;
  color: var(--zhuyin); text-align: left; user-select: none;
}
.zy-s { display: block; writing-mode: vertical-lr; text-orientation: upright; letter-spacing: -.04em; }
.zy-t { position: absolute; right: .02em; top: 50%; transform: translateY(-45%); }
.zy-t-light { right: auto; left: 50%; top: -.9em; transform: translateX(-90%); }

/* 深橘底上灰色注音的對比只有 1.19，幾乎看不見 */
.hero rt { color: rgba(255, 255, 255, .92); }

body.zhuyin-off ruby { display: inline; }
body.zhuyin-off rt { display: none; }

/* ── 響應式 ───────────────────────────── */
@media (max-width: 560px) {
  body { font-size: 16px; }
  .hero { padding: 2.25rem 0 2rem; }
  section, .subj { padding: 2rem 0; }
  .reslist { grid-template-columns: 1fr; }
  .badges { grid-template-columns: repeat(auto-fill, minmax(118px, 1fr)); }
  .fabs { right: .6rem; bottom: .6rem; }
  .fab { padding: .45rem .8rem; font-size: .82rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}