/* 版面：活潑插畫風。頂部導覽 + 左文右圖 hero + 單欄章節卡 + 左右兩欄計算機 */
:root {
  --bg: #EEF6FF;
  --card: #FFFFFF;
  --ink: #1B2A4A;
  --muted: #55627F;
  --line: #1B2A4A;
  --coral: #FF6B5B;
  --sun: #FFC93C;
  --mint: #2FA37F;
  --mint-soft: #D5F5EA;
  --violet: #7C6CF0;
  --wrong: #FFE1DD;
  --up: #E5484D;      /* 台灣習慣：紅漲 */
  --down: #1FA971;    /* 台灣習慣：綠跌 */
  --ma5: #7C6CF0;
  --ma20: #F59E0B;
  --grid: #D5DEEE;
  --font-display: "Huninn", "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  --font-body: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", system-ui, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #121A2E; --card: #1C2744; --ink: #EEF2FF; --muted: #A5B0CC; --line: #0A1020;
    --mint: #3CC9A0; --mint-soft: #1B3B3A; --wrong: #4A2530; --grid: #2C3A5E; --ma5: #A79BFF; color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #121A2E; --card: #1C2744; --ink: #EEF2FF; --muted: #A5B0CC; --line: #0A1020;
  --mint: #3CC9A0; --mint-soft: #1B3B3A; --wrong: #4A2530; --grid: #2C3A5E; --ma5: #A79BFF; color-scheme: dark;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 76px; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 400 17px/1.8 var(--font-body);
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
}
img { max-width: 100%; height: auto; }
h1, h2, h3 { font-family: var(--font-display); line-height: 1.35; text-wrap: balance; margin: 0; }
:focus-visible { outline: 3px solid var(--violet); outline-offset: 3px; border-radius: 6px; }

.topbar, main, footer { max-width: 1040px; margin-inline: auto; }
.topbar {
  position: sticky; top: 0; z-index: 5; display: flex; flex-wrap: wrap; gap: 8px 24px;
  align-items: center; justify-content: space-between; padding: 12px 0; background: var(--bg);
}
.brand { display: flex; align-items: center; gap: 8px; font: 700 20px var(--font-display); color: var(--ink); text-decoration: none; }
.topbar nav { display: flex; gap: 20px; flex-wrap: wrap; }
.topbar nav a { color: var(--ink); text-decoration: none; font-weight: 500; font-size: 15px; }
.topbar nav a:hover { color: var(--coral); }

.hero { display: grid; grid-template-columns: 1.1fr .9fr; gap: 24px; align-items: center; padding-block: 24px 56px; }
.hero > * { min-width: 0; }
.tag { display: inline-block; margin: 0 0 12px; padding: 2px 14px; background: var(--sun); border: 3px solid var(--line); border-radius: 99px; font-weight: 700; font-size: 14px; color: #1B2A4A; transform: rotate(-2deg); }
.hero h1 { font-size: clamp(32px, 5.6vw, 52px); }
.hero h1 em { font-style: normal; background: linear-gradient(transparent 62%, var(--sun) 62%); }
.lead { font-size: 18px; color: var(--muted); max-width: 34em; margin: 16px 0 24px; }
.cta { display: flex; flex-wrap: wrap; gap: 12px; }
.btn {
  display: inline-block; padding: 10px 22px; border: 3px solid var(--line); border-radius: 14px;
  background: var(--coral); color: #fff; font: 700 16px var(--font-body); text-decoration: none; cursor: pointer;
  box-shadow: 4px 4px 0 var(--line); transition: transform .12s, box-shadow .12s;
}
.btn:hover { transform: translate(2px, 2px); box-shadow: 2px 2px 0 var(--line); }
.btn.ghost { background: var(--card); color: var(--ink); }
.progress { margin-top: 28px; max-width: 360px; }
.bar { height: 16px; border: 3px solid var(--line); border-radius: 99px; background: var(--card); overflow: hidden; }
.bar span { display: block; height: 100%; width: 0; background: var(--mint); transition: width .4s; }
.progress p { margin: 6px 0 0; font-size: 14px; color: var(--muted); }
.hero-img { width: 100%; }

.wrap { padding-block: 40px; }
h2 { font-size: clamp(26px, 4vw, 34px); }
.sub { color: var(--muted); margin: 6px 0 24px; }

/* chapters */
.chapters { display: grid; gap: 16px; }
.chapter { background: var(--card); border: 3px solid var(--line); border-radius: 20px; box-shadow: 5px 5px 0 var(--line); overflow: hidden; }
.chapter summary { display: flex; align-items: center; gap: 16px; padding: 14px 18px; cursor: pointer; list-style: none; }
.chapter summary::-webkit-details-marker { display: none; }
.chapter summary img { width: 60px; height: 60px; flex: none; }
.chapter .head { flex: 1; min-width: 0; }
.chapter .num { font-size: 13px; font-weight: 700; color: var(--violet); letter-spacing: .08em; }
.chapter h3 { font-size: 21px; }
.chapter .state { flex: none; font-size: 13px; font-weight: 700; padding: 2px 12px; border-radius: 99px; background: var(--bg); border: 2px solid var(--line); }
.chapter.done .state { background: var(--mint-soft); color: var(--mint); }
.chapter .body { padding: 4px 22px 24px; border-top: 3px dashed var(--bg); }
.chapter .intro { color: var(--muted); }
.points { display: grid; gap: 12px; padding: 0; margin: 16px 0 0; list-style: none; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.points li { background: var(--bg); border-radius: 14px; padding: 12px 16px; min-width: 0; }
.points b { display: block; font-family: var(--font-display); font-size: 17px; margin-bottom: 2px; }
.points span { font-size: 15.5px; line-height: 1.7; }
.tip { margin: 18px 0 0; padding: 12px 16px; background: var(--sun); color: #1B2A4A; border-radius: 14px; border: 3px solid var(--line); font-size: 15.5px; }

.quiz { margin-top: 24px; padding-top: 16px; border-top: 3px dashed var(--bg); }
.quiz h4 { margin: 0 0 12px; font: 700 18px var(--font-display); }
.q { margin-bottom: 18px; }
.q p { margin: 0 0 8px; font-weight: 700; }
.opts { display: grid; gap: 8px; }
.opt { text-align: left; padding: 10px 14px; border: 2px solid var(--line); border-radius: 12px; background: var(--card); color: var(--ink); font: 400 16px/1.6 var(--font-body); cursor: pointer; }
.opt:hover:not(:disabled) { background: var(--bg); }
.opt.right { background: var(--mint-soft); border-color: var(--mint); }
.opt.wrong { background: var(--wrong); border-color: var(--coral); }
.opt:disabled { cursor: default; }
.why { margin: 8px 0 0; font-size: 15px; color: var(--muted); }
.finish { margin-top: 8px; font-weight: 700; color: var(--mint); }

/* chart lessons */
.lesson { margin-bottom: 20px; }
.lesson h3 { font-size: 22px; margin-bottom: 6px; }
.lesson > p { margin: 0 0 14px; color: var(--muted); }
.candle-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; align-items: center; }
.candle-grid > * { min-width: 0; }
.candle-view svg { width: 100%; max-width: 240px; height: auto; display: block; margin-inline: auto; }
.read { margin: 10px 0 0; padding: 10px 14px; background: var(--bg); border-radius: 12px; font-size: 15.5px; line-height: 1.7; }
.toggles { display: flex; flex-wrap: wrap; gap: 8px 20px; margin-bottom: 8px; }
.panel .toggles label { margin: 0; font-size: 15px; }
.chart-scroll { overflow-x: auto; }
#demoChart { width: 100%; min-width: 520px; height: auto; display: block; }
#demoChart text, #candleSvg text { fill: var(--muted); font-size: 11px; font-family: var(--font-body); }
#demoChart .hit { fill: transparent; cursor: pointer; }
#demoChart .hit:hover { fill: rgba(124, 108, 240, .14); }
#demoChart .sel { fill: none; stroke: var(--ink); stroke-width: 1.5; stroke-dasharray: 3 2; }
.legend { list-style: none; padding: 0; margin: 12px 0 0; display: grid; gap: 4px 20px; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); font-size: 14.5px; }
.sw { display: inline-block; width: 14px; height: 14px; margin-right: 8px; border-radius: 3px; vertical-align: -2px; border: 2px solid var(--line); }
.sw.up { background: var(--up); } .sw.down { background: var(--down); }
.sw.ma5 { background: var(--ma5); } .sw.ma20 { background: var(--ma20); }
.read-grid { display: grid; gap: 20px; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); margin-bottom: 20px; }
.read-grid > * { min-width: 0; }
.read-grid h3 { font-size: 19px; margin-bottom: 8px; }
.plain { margin: 0; padding-left: 1.1em; display: grid; gap: 8px; font-size: 15.5px; line-height: 1.7; }

/* calculator */
.calc-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 20px; }
.calc-grid > * { min-width: 0; }
.panel { background: var(--card); border: 3px solid var(--line); border-radius: 20px; padding: 22px; box-shadow: 5px 5px 0 var(--line); }
.panel label { display: block; margin-bottom: 16px; font-weight: 500; }
.panel label:last-child { margin-bottom: 0; }
input[type="number"], input[type="search"] {
  display: block; width: 100%; margin-top: 4px; padding: 8px 12px; border: 2px solid var(--line);
  border-radius: 10px; background: var(--bg); color: var(--ink); font: 500 18px var(--font-body);
}
input[type="range"] { display: block; width: 100%; margin-top: 8px; accent-color: var(--coral); }
.big-label { margin: 0; color: var(--muted); font-size: 14px; }
.big { margin: 0; font: 700 clamp(30px, 5vw, 42px) var(--font-display); font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }
.result dl { margin: 12px 0; display: grid; gap: 4px; }
.result dl div { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.result dt { color: var(--muted); }
.result dd { margin: 0; font-weight: 700; font-variant-numeric: tabular-nums; }
.dot { display: inline-block; width: 12px; height: 12px; border-radius: 4px; margin-right: 8px; border: 2px solid var(--line); }
.c1 { background: var(--sun); } .c2 { background: var(--coral); }
#chart { width: 100%; height: auto; display: block; }
#chart text { fill: var(--muted); font-size: 11px; font-family: var(--font-body); }
.note { font-size: 14px; color: var(--muted); margin: 8px 0 0; }

/* glossary */
.search span { font-weight: 700; margin-right: 8px; }
.search { display: block; max-width: 420px; margin-bottom: 20px; }
.terms { display: grid; gap: 12px; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); margin: 0; }
.term { background: var(--card); border: 3px solid var(--line); border-radius: 16px; padding: 12px 16px; min-width: 0; }
.term dt { font: 700 18px var(--font-display); }
.term dt small { font: 400 13px var(--font-body); color: var(--violet); margin-left: 6px; }
.term dd { margin: 4px 0 0; font-size: 15.5px; line-height: 1.7; }

footer { padding-block: 32px 48px; color: var(--muted); font-size: 14px; }
footer p { margin: 0 0 12px; }
.link { background: none; border: 0; padding: 0; color: var(--muted); text-decoration: underline; cursor: pointer; font: inherit; }

@media (max-width: 760px) {
  body { font-size: 16px; }
  .hero, .calc-grid, .candle-grid { grid-template-columns: 1fr; }
  .hero-img { max-width: 360px; margin-inline: auto; }
  .chapter summary { gap: 12px; padding: 12px; }
  .chapter summary img { width: 48px; height: 48px; }
  .chapter .state { display: none; }
  .chapter.done .num::after { content: " ✓ 已完成"; color: var(--mint); }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}