/* 一筆一恩官網：一本攤開的活頁筆記本。
   色彩照設計代幣（Outputs/一筆一恩/設計交付-20260923/handoff/README.md）：白＋主藍＋天空藍，不另加顏色。
   筆記本元素：橫線、打孔、天空藍邊線、田字格、紙膠帶、手繪底線與刪除線。只有淺色（App 第一版沒有深色模式）。 */

/* @font-face 由 build.mjs 直接寫進每頁 <head>（首屏字與其餘字拆兩個檔，unicode-range 依實際字集產生） */

:root {
  --primary: #2A74B8;
  --sky: #8DC4EE;
  --deep: #1E4E7A;
  --text: #1E3A54;
  --text-2: #47688A;
  --text-3: #51718E; /* 設計代幣的輔助色 #6B8CA8 對白底只有 3.5:1，文字用加深版（白底 4.9、淡藍底 4.6，過 WCAG AA） */
  --faint: #9DB6CC;
  --mist: #F4F8FC;
  --tint: #EAF3FB;
  --line: #E3EDF6;
  --line-2: #D5E5F2;
  --rule: #E1ECF7;
  --ghost: #DCE9F5;
  --hole: #EEF3F8;
  --radius: 22px;
  --wrap: 1180px;
  --gutter: 20px;
  --rule-gap: 40px;
  --font: 'Iansui', 'PingFang TC', 'Noto Sans TC', 'Microsoft JhengHei', system-ui, sans-serif;
  color-scheme: light;
}
:lang(zh-Hans) { --font: 'PGKai', 'Iansui', 'PingFang SC', 'Noto Sans SC', 'Microsoft YaHei', system-ui, sans-serif; }

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body { margin: 0; background: #fff; color: var(--text); font-family: var(--font); font-size: 18px; line-height: 1.8; letter-spacing: .02em; -webkit-font-smoothing: antialiased; overflow-x: hidden; }
body:lang(en) { letter-spacing: 0; line-height: 1.7; }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--primary); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--deep); }
:focus-visible { outline: 3px solid var(--sky); outline-offset: 3px; border-radius: 8px; }
h1, h2, h3 { color: var(--text); font-weight: 700; line-height: 1.35; letter-spacing: .03em; margin: 0 0 .5em; }
:lang(en) h1, :lang(en) h2, :lang(en) h3 { letter-spacing: -.005em; }
h1 { font-size: clamp(34px, 5.2vw, 60px); }
h2 { font-size: clamp(27px, 3.4vw, 40px); }
h3 { font-size: 21px; }
p { margin: 0 0 1em; }
ul, ol { margin: 0; padding: 0; }
.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 var(--gutter); }
.narrow { max-width: 760px; }
.center { text-align: center; }
.muted { color: var(--text-3); }
.small { font-size: 15px; }
.fine { font-size: 15px; color: var(--text-3); }
.lead { font-size: clamp(19px, 2.1vw, 22px); color: var(--text-2); }
.skip { position: absolute; left: -999px; top: 8px; background: var(--primary); color: #fff; padding: 8px 16px; border-radius: 999px; z-index: 20; }
.skip:focus { left: 12px; }

/* ── 手繪線條 ── */
.doodle-arrow, .doodle-underline, .doodle-strike, .doodle-circle { fill: none; stroke: currentColor; stroke-linecap: round; stroke-linejoin: round; }
.ink-underline { position: relative; display: inline; white-space: normal; }
.ink-underline .doodle-underline { position: absolute; left: -2%; bottom: -.28em; width: 104%; height: .45em; color: var(--sky); stroke-width: 4; z-index: -1; }
.ink-underline { z-index: 0; }

/* ── 活頁紙：橫線＋打孔＋邊線 ── */
.paper { position: relative; background-color: #fff;
  background-image: linear-gradient(to bottom, transparent calc(var(--rule-gap) - 1px), var(--rule) calc(var(--rule-gap) - 1px));
  background-size: 100% var(--rule-gap); }
.paper::before { content: ''; position: absolute; top: 0; bottom: 0; left: 72px; width: 2px; background: var(--sky); opacity: .55; }
.paper::after { content: ''; position: absolute; top: 0; bottom: 0; left: 0; width: 56px;
  background: radial-gradient(circle at 28px 50%, var(--hole) 11px, #fff 12px, transparent 13px) 0 40px / 56px 180px repeat-y; }
@media (max-width: 700px) { .paper::before { left: 34px; } .paper::after { width: 26px; background: radial-gradient(circle at 12px 50%, var(--hole) 6px, transparent 7px) 0 30px / 26px 120px repeat-y; } }

/* ── 頁首 ── */
.top { position: sticky; top: 0; z-index: 10; background: rgba(255,255,255,.94); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); border-bottom: 1.5px solid var(--line); }
.top-row { display: flex; align-items: center; justify-content: space-between; min-height: 66px; gap: 16px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--primary); text-decoration: none; font-size: 22px; letter-spacing: .14em; white-space: nowrap; }
:lang(en) .brand { letter-spacing: .01em; }
.brand svg { width: 28px; height: 28px; flex: none; }
.nav { display: flex; align-items: center; gap: 26px; }
.nav ul { display: flex; gap: 22px; list-style: none; }
.nav a { color: var(--text-2); text-decoration: none; font-size: 17px; position: relative; }
.nav ul a::after { content: ''; position: absolute; left: -4px; right: -4px; bottom: -2px; height: 8px; background: var(--sky); opacity: 0; border-radius: 4px; transform: rotate(-1.5deg) scaleX(.6); transition: .2s; z-index: -1; }
.nav ul a:hover::after, .nav ul a[aria-current="page"]::after { opacity: .45; transform: rotate(-1.5deg) scaleX(1); }
.nav ul a[aria-current="page"] { color: var(--text); }
.langs { display: flex; gap: 2px; flex-wrap: wrap; }
.langs a { font-size: 14px; color: var(--text-3); text-decoration: none; padding: 3px 9px; border-radius: 999px; border: 1.5px solid transparent; }
.langs a[aria-current="true"] { color: var(--primary); border-color: var(--sky); }
.menu-btn { display: none; font: inherit; font-size: 16px; color: var(--primary); background: #fff; border: 1.5px solid var(--sky); border-radius: 999px; padding: 6px 18px; cursor: pointer; }
@media (max-width: 920px) {
  .menu-btn { display: inline-block; }
  .nav { display: none; position: absolute; left: 0; right: 0; top: 100%; background: #fff; border-bottom: 1.5px solid var(--line); padding: 8px var(--gutter) 20px; flex-direction: column; align-items: stretch; gap: 14px; }
  .nav.open { display: flex; }
  .nav ul { flex-direction: column; gap: 0; }
  .nav ul a { display: block; padding: 12px 4px; border-bottom: 1px dashed var(--line-2); font-size: 18px; }
  .nav ul a::after { display: none; }
}

.lang-hint:not([hidden]) { display: flex; justify-content: center; align-items: center; gap: 12px; flex-wrap: wrap; background: var(--tint); font-size: 15px; padding: 8px var(--gutter); }
.lang-hint a { font-weight: 700; color: var(--deep); }
.lang-hint button { font: inherit; font-size: 14px; background: none; border: 0; color: var(--text-3); cursor: pointer; }

/* ── 按鈕 ── */
.btn { display: inline-flex; align-items: center; gap: 10px; border-radius: 999px; padding: 12px 24px; font-size: 17px; text-decoration: none; border: 1.5px solid transparent; line-height: 1.3; }
.btn svg { width: 20px; height: 20px; flex: none; }
.btn-lg { padding: 15px 28px; font-size: 18px; }
.btn-primary { background: var(--primary); color: #fff; box-shadow: 0 3px 0 var(--deep); }
.btn-primary:hover { background: var(--deep); color: #fff; }
.btn-soon { background: #fff; color: var(--primary); border-color: var(--primary); box-shadow: 3px 3px 0 var(--sky); }
.cta-row { display: flex; gap: 12px; flex-wrap: wrap; margin: 30px 0 14px; }
.more { display: inline-flex; align-items: center; gap: 4px; text-decoration: none; }
.more svg { width: 18px; height: 18px; }

/* ── 字格 ── */
.cells { display: flex; flex-wrap: wrap; }
.cell { position: relative; display: inline-grid; place-items: center; width: 96px; height: 96px; border: 2px solid var(--sky); background: #fff; margin-left: -2px; flex: none; }
.cell:first-child { margin-left: 0; }
.cell::before, .cell::after { content: ''; position: absolute; pointer-events: none; }
.cell::before { left: 0; right: 0; top: 50%; border-top: 1.5px dashed var(--line-2); }
.cell::after { top: 0; bottom: 0; left: 50%; border-left: 1.5px dashed var(--line-2); }
.glyph { position: relative; z-index: 1; font-size: 66px; line-height: 1; color: var(--text); transform: rotate(var(--r, 0deg)); }
.glyph.ghost { color: var(--ghost); }
.canvas-cell { background: #fff; box-shadow: 0 0 0 4px var(--tint); z-index: 2; }
.canvas-cell .glyph.ghost { grid-area: 1 / 1; z-index: 1; }
.pad { position: absolute; inset: 0; width: 100%; height: 100%; z-index: 2; touch-action: none; cursor: crosshair; }

/* ── 首頁：主視覺 ── */
.hero { padding: 56px 0 96px; overflow: hidden; }
.hero-grid { position: relative; z-index: 1; display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, .75fr); gap: 56px; align-items: start; padding-left: 70px; }
.margin-note { color: var(--primary); font-size: 16px; letter-spacing: .18em; margin: 0 0 18px; }
:lang(en) .margin-note { letter-spacing: .06em; }
.hero h1 { font-size: clamp(32px, 5vw, 62px); line-height: 1.3; margin-bottom: 20px; }
.hero .lead { max-width: 30em; }
.try { margin: 34px 0 6px; }
.try-note { display: flex; align-items: center; gap: 10px; margin: 14px 0 0; color: var(--primary); font-size: 17px; }
.try-note .doodle-arrow { width: 54px; height: 32px; stroke-width: 3; transform: scaleY(-1) rotate(-10deg); color: var(--sky); }
.pad-clear { font: inherit; font-size: 15px; color: var(--text-3); background: none; border: 0; border-bottom: 1.5px dashed var(--line-2); padding: 0 2px; cursor: pointer; margin-left: 6px; }
.hero-art { position: relative; padding-top: 30px; justify-self: center; width: min(100%, 340px); }
.scribble-note { position: relative; margin: 26px 0 0 12px; color: var(--primary); font-size: 18px; transform: rotate(-3deg); }
.scribble-note::before { content: '↑'; display: inline-block; margin-right: 8px; font-size: 22px; color: var(--sky); }

/* ── 貼上去的截圖 ── */
.snap { position: relative; margin: 0; background: #fff; padding: 9px; border-radius: 38px; transform: rotate(var(--tilt, 0deg)); box-shadow: 0 1px 0 var(--line), 0 26px 50px -26px rgba(30,78,122,.45), 0 6px 14px -8px rgba(30,78,122,.2); }
.snap img { border-radius: 30px; border: 1px solid var(--line); }
.tape { position: absolute; z-index: 3; top: -16px; left: 50%; width: 112px; height: 32px; margin-left: -56px; background: rgba(141,196,238,.55); transform: rotate(-5deg);
  clip-path: polygon(3% 0, 97% 4%, 100% 22%, 96% 45%, 100% 70%, 97% 100%, 2% 96%, 0 74%, 4% 50%, 0 26%); }

/* ── 章節標題：左對齊＋頁碼 ── */
.sec-title { display: grid; grid-template-columns: auto 1fr; column-gap: 22px; align-items: baseline; max-width: 820px; margin-bottom: 48px; }
.sec-title h2 { margin: 0; }
.sec-title p { grid-column: 2; margin: 10px 0 0; color: var(--text-2); font-size: 19px; }
.sec-no { display: inline-block; color: var(--primary); font-size: 17px; letter-spacing: .08em; padding: 2px 10px; border: 1.5px solid var(--sky); border-radius: 999px; transform: rotate(-4deg) translateY(-6px); }

/* ── 三種寫法 ── */
.modes-sec { padding: 104px 0 88px; }
.specimens { list-style: none; display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; }
.specimens li { position: relative; }
.specimens h3 { margin: 22px 0 6px; }
.specimens p { color: var(--text-2); margin: 0; max-width: 20em; }
.cell.big { width: 156px; height: 156px; }
.cell.big .glyph { font-size: 110px; }
.specimens.wide .cell.big { width: auto; min-width: 156px; padding: 0 26px; }
.specimens.wide .cell.big .glyph { font-size: 76px; }
.specimens.wide .cell.big::after { display: none; }
.cell.trace .glyph { grid-area: 1 / 1; }
.cell.trace .glyph.half { color: var(--primary); clip-path: inset(0 0 52% 0); }
.cell.copy .model { position: absolute; top: 8px; left: 10px; font-size: 22px; color: var(--text-3); z-index: 1; }
.cell.type { background: var(--mist); }
.typed { position: relative; z-index: 1; font-size: 64px; line-height: 1; color: var(--text); display: inline-flex; align-items: center; }
.specimens.wide .typed { font-size: 52px; }
.caret { display: inline-block; width: 3px; height: .9em; background: var(--primary); margin-left: 4px; animation: blink 1.1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }

/* ── 剪貼簿 ── */
.scrap { padding: 72px 0 120px; background: var(--mist); position: relative; }
.scrap::before { content: ''; position: absolute; left: 0; right: 0; top: 0; height: 22px; background: radial-gradient(circle at 11px -3px, #fff 12px, transparent 13px) 0 0 / 22px 22px repeat-x; }
.scrap .sec-title { padding-top: 24px; }
.scrap-board { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); column-gap: 24px; align-items: start; }
.scrap-item { position: relative; }
.scrap-item .snap { max-width: 290px; }
.s1 { grid-column: 1 / 5; }
.s2 { grid-column: 5 / 9; margin-top: 110px; }
.s3 { grid-column: 9 / 13; margin-top: 30px; }
.s1 .snap { max-width: 320px; }
.sticky { position: relative; z-index: 4; margin: -120px 0 0 36px; max-width: 290px; background: #fff; border: 1.5px solid var(--sky); border-radius: 6px 18px 6px 18px; padding: 22px 22px 18px; transform: rotate(2deg); box-shadow: 6px 6px 0 var(--tint); }
.sticky.alt { transform: rotate(-2.5deg); margin-left: -18px; }
.sticky h3 { font-size: 20px; }
.sticky p { font-size: 16px; color: var(--text-2); margin: 0; }

/* ── 印記月曆 ── */
.marks-sec { padding: 110px 0 150px; }
.marks-sec .wrap { padding-left: 110px; }
.calendar { max-width: 820px; }
.cal-month { color: var(--primary); font-size: 22px; margin-bottom: 12px; }
.days { list-style: none; display: grid; grid-template-columns: repeat(10, 1fr); border-top: 2px solid var(--sky); border-left: 2px solid var(--sky); background: #fff; }
.day { position: relative; aspect-ratio: 1; border-right: 2px solid var(--sky); border-bottom: 2px solid var(--sky); }
.day .d { position: absolute; top: 4px; left: 7px; font-size: 13px; color: var(--text-3); }
.stamp { position: absolute; inset: 30% 24% 16% 28%; display: grid; place-items: center; border-radius: 50%; background: var(--sky); color: #fff; transform: rotate(-8deg); }
.day:nth-child(3n) .stamp { transform: rotate(12deg); inset: 32% 28% 14% 24%; }
.day:nth-child(5n+2) .stamp { background: var(--primary); }
.stamp svg { width: 60%; height: 60%; stroke-width: 12; }
.day.today .stamp { background: #fff; color: var(--primary); box-shadow: 0 0 0 2px var(--primary); }
.day.gap { background: repeating-linear-gradient(-45deg, #fff 0 6px, var(--mist) 6px 12px); }
.day.future { background: #fff; }
.gap-note { position: absolute; z-index: 3; top: calc(100% + 2px); left: 30%; width: 250px; display: flex; gap: 6px; align-items: flex-start; color: var(--primary); font-size: 17px; line-height: 1.5; pointer-events: none; }
.gap-note .doodle-arrow { flex: none; width: 34px; height: 46px; stroke-width: 3; color: var(--sky); transform: scaleY(-1); margin-top: -4px; }
.gap-note span { margin-top: 28px; transform: rotate(-2deg); background: #fff; padding: 0 4px; }

/* ── 這裡沒有 ── */
.nots { padding: 110px 0 100px; }
.nots-pre { color: var(--text-3); font-size: 20px; margin-bottom: 8px; }
.nots-list { list-style: none; display: flex; flex-wrap: wrap; gap: 6px 34px; margin-bottom: 26px; }
.struck { position: relative; font-size: clamp(34px, 5vw, 60px); color: var(--faint); line-height: 1.3; }
.struck .doodle-strike { position: absolute; left: -4%; top: 38%; width: 108%; height: 30%; color: var(--primary); stroke-width: 3.5; }
.nots-list li:nth-child(even) .doodle-strike { transform: scaleX(-1) rotate(2deg); }
.nots-post { font-size: clamp(28px, 3.6vw, 44px); color: var(--text); margin: 0 0 56px; }
.footnotes { list-style: none; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 28px 48px; max-width: 980px; border-top: 1.5px dashed var(--line-2); padding-top: 28px; }
.footnotes li { display: grid; grid-template-columns: 48px 1fr; gap: 16px; align-items: start; font-size: 16px; color: var(--text-2); }
.footnotes p { margin: 0; }
.fn-icon { width: 48px; height: 48px; display: grid; place-items: center; border: 1.5px solid var(--sky); border-radius: 50%; color: var(--primary); background: #fff; transform: rotate(-4deg); }
.footnotes li:nth-child(even) .fn-icon { transform: rotate(5deg); }
.fn-icon svg { width: 24px; height: 24px; }
.footnotes strong { display: block; color: var(--text); font-weight: 700; font-size: 17px; margin-bottom: 2px; }

/* ── 書架＋目錄 ── */
.library { padding: 96px 0 110px; background: var(--mist); }
.lib-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 80px; align-items: start; }
.sec-title.left { display: block; margin-bottom: 36px; }
.sec-title.left .sec-no { margin-bottom: 14px; }
.sec-title.left p { margin-top: 10px; }
.shelf { list-style: none; display: flex; align-items: flex-end; gap: 8px; height: 300px; padding: 0 12px; border-bottom: 10px solid var(--line-2); margin-bottom: 20px; }
.spine { writing-mode: vertical-rl; display: flex; justify-content: space-between; align-items: center; padding: 20px 0 16px; border-radius: 6px 6px 2px 2px; color: #fff; font-size: 22px; letter-spacing: .16em; box-shadow: inset -6px 0 0 rgba(0,0,0,.08); background-image: linear-gradient(to bottom, transparent 44px, rgba(255,255,255,.35) 44px, rgba(255,255,255,.35) 46px, transparent 46px); }
.spine-mark svg { width: 22px; height: 22px; stroke-width: 11; opacity: .8; }
.shelf-legend { margin: 0 0 18px; display: grid; gap: 6px; }
.shelf-legend div { display: grid; grid-template-columns: 70px 1fr; gap: 12px; font-size: 16px; }
.shelf-legend dt { color: var(--primary); }
.shelf-legend dd { margin: 0; color: var(--text); }
.shelf-legend dd span { color: var(--text-3); margin-left: 10px; font-size: 14px; }
.sp0 { width: 76px; height: 270px; background: var(--deep); }
.sp1 { width: 68px; height: 240px; background: var(--primary); }
.sp2 { width: 58px; height: 214px; background: #fff; color: var(--primary); border: 2px solid var(--sky); box-shadow: none; transform: rotate(-4deg); transform-origin: bottom left; margin-left: 10px; }
.sp3 { width: 62px; height: 226px; background: var(--sky); color: var(--deep); }
.toc { background: #fff; border-radius: 8px; padding: 40px 40px 30px; box-shadow: 0 1px 0 var(--line), 10px 10px 0 var(--tint); transform: rotate(.6deg); }
.toc h2 { font-size: clamp(24px, 2.6vw, 32px); }
.toc > p { color: var(--text-2); }
.toc-list { list-style: none; margin: 26px 0; counter-reset: toc; }
.toc-list li { display: flex; align-items: baseline; gap: 8px; padding: 10px 0; counter-increment: toc; }
.toc-list li::before { content: counter(toc); color: var(--primary); font-size: 15px; width: 22px; }
.toc-t { font-size: 20px; }
.toc-dots { flex: 1; border-bottom: 2.5px dotted var(--line-2); transform: translateY(-5px); min-width: 20px; }
.toc-d { color: var(--text-3); font-size: 16px; white-space: nowrap; }

/* ── 文章：索引卡 ── */
.notes-sec { padding: 100px 0; }
.cards { list-style: none; display: grid; grid-template-columns: repeat(auto-fill, minmax(290px, 1fr)); gap: 30px; }
.card { transform: rotate(var(--tilt, 0deg)); transition: transform .2s; }
.card:hover { transform: rotate(0deg) translateY(-3px); }
.card a { display: flex; flex-direction: column; height: 100%; background: #fff; border: 1.5px solid var(--line-2); border-radius: 4px; padding: 0 26px 22px; text-decoration: none; color: var(--text);
  background-image: linear-gradient(var(--sky), var(--sky)); background-size: 100% 2px; background-position: 0 54px; background-repeat: no-repeat;
  box-shadow: 4px 5px 0 var(--tint); }
.card-date { display: block; height: 54px; line-height: 54px; font-size: 14px; color: var(--text-3); letter-spacing: .08em; }
.card h3 { font-size: 20px; line-height: 1.5; margin: 28px 0 14px; }
.card p { color: var(--text-2); font-size: 16px; flex: 1; margin: 0; }
.card .more { color: var(--primary); font-size: 16px; margin-top: 10px; }
.draft { display: inline-block; align-self: flex-start; font-size: 12px; letter-spacing: .1em; color: #8A5A00; background: #FFF4DB; border-radius: 999px; padding: 2px 10px; margin: 14px 0 -26px; line-height: 1.6; }

/* ── 結尾 ── */
.closing { padding: 120px 0 130px; }
.closing.short { padding: 80px 0 90px; }
.closing-inner { padding-left: 110px; }
.closing h2 { font-size: clamp(34px, 5vw, 64px); margin-bottom: 20px; }
.closing p { color: var(--text-2); max-width: 34em; }

/* ── 內頁 ── */
.page-head { padding: 70px 0 44px; border-bottom: 1.5px solid var(--line); }
.page-head-inner { padding-left: 90px; max-width: 900px; }
.page-head h1 { font-size: clamp(34px, 4.6vw, 54px); margin-bottom: 24px; }
.page-head .lead { margin: 0; background: rgba(255,255,255,.85); }
.section { padding: 80px 0; }

.spec { display: grid; grid-template-columns: 260px 1fr; gap: 32px; padding: 40px 0; border-bottom: 1.5px dashed var(--line-2); }
.spec:first-child { padding-top: 0; }
.spec h2 { font-size: 26px; display: flex; flex-direction: column; align-items: flex-start; gap: 10px; }
.spec h2 .sec-no { transform: rotate(-4deg); font-size: 15px; }
.spec dl { margin: 0; display: grid; grid-template-columns: repeat(2, 1fr); gap: 26px 40px; }
.spec dt { font-size: 19px; margin-bottom: 4px; }
.spec dt::before { content: '✓'; color: var(--primary); margin-right: 8px; }
.spec dd { margin: 0; color: var(--text-2); font-size: 16px; }
.shots { display: grid; grid-template-columns: repeat(4, 1fr); gap: 34px; margin-top: 80px; }

.faq details { border-bottom: 1.5px dashed var(--line-2); }
.faq summary { list-style: none; cursor: pointer; padding: 22px 48px 22px 0; font-size: 20px; position: relative; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::before { content: 'Q'; color: var(--primary); margin-right: 14px; font-size: 18px; }
.faq summary::after { content: '+'; position: absolute; right: 6px; top: 50%; transform: translateY(-50%); width: 32px; height: 32px; display: grid; place-items: center; border: 1.5px solid var(--sky); border-radius: 50%; color: var(--primary); transition: transform .2s; }
.faq details[open] summary::after { transform: translateY(-50%) rotate(45deg); }
.faq .answer { padding: 0 0 22px 32px; color: var(--text-2); }
.faq .answer p { margin: 0; }
.contact-line { margin-top: 44px; text-align: center; }
.mail { display: inline-flex; align-items: center; gap: 8px; text-decoration: none; word-break: break-all; }
.mail svg { width: 20px; height: 20px; flex: none; }
.mail.big { font-size: clamp(19px, 2.6vw, 26px); margin: 4px 0 12px; }

.contact-card { position: relative; background: #fff; border: 1.5px solid var(--sky); border-radius: 6px 20px 6px 20px; padding: 34px 32px 28px; margin: 20px 0 52px; box-shadow: 8px 8px 0 var(--tint); transform: rotate(-.6deg); }
.contact-card::before { content: ''; position: absolute; top: -15px; left: 40px; width: 100px; height: 30px; background: rgba(141,196,238,.55); transform: rotate(-4deg); }
.contact-card h2 { font-size: 22px; }
.contact-card p { margin: 0; }
.topic { padding: 30px 0; border-bottom: 1.5px dashed var(--line-2); }
.topic h2 { font-size: 23px; }
.topic p { color: var(--text-2); margin: 0; }
.steps { list-style: none; counter-reset: s; color: var(--text-2); }
.steps li { counter-increment: s; position: relative; padding-left: 42px; margin: 12px 0; }
.steps li::before { content: counter(s); position: absolute; left: 0; top: 1px; width: 28px; height: 28px; display: grid; place-items: center; border: 1.5px solid var(--sky); border-radius: 50%; color: var(--primary); font-size: 15px; }

.prose { font-size: 19px; }
.prose h2 { font-size: 27px; margin-top: 1.8em; }
.prose p, .prose li { color: var(--text-2); }
.prose ul, .prose ol { padding-left: 1.3em; margin: 0 0 1em; }
.prose li { margin: 6px 0; }
.prose li::marker { color: var(--sky); }
.prose strong { color: var(--text); font-weight: 700; }
.credits { margin: 22px 0; border-top: 1.5px solid var(--line-2); }
.credits div { display: grid; grid-template-columns: 250px 1fr; gap: 20px; padding: 14px 0; border-bottom: 1.5px dashed var(--line-2); }
.credits dt { color: var(--text); font-size: 17px; }
.credits dd { margin: 0; color: var(--text-2); font-size: 16px; }

.article { padding-bottom: 60px; }
.article-head { padding-top: 56px; padding-bottom: 12px; }
.article-head h1 { font-size: clamp(30px, 4.2vw, 46px); margin-top: 18px; }
.back { font-size: 16px; text-decoration: none; }
.back::before { content: '← '; }
.nf-wrap { display: grid; gap: 48px; }
.nf h2 { font-size: 26px; }

/* ── 頁尾：封底 ── */
.foot { background: var(--deep); color: rgba(255,255,255,.8); padding: 60px 0 44px; font-size: 16px; }
.foot a { color: #fff; }
.foot .brand { color: #fff; font-size: 19px; margin-bottom: 8px; }
.foot .muted { color: rgba(255,255,255,.65); }
.foot-grid { display: grid; grid-template-columns: 1.2fr 1fr 1.2fr; gap: 40px; }
.foot-links { list-style: none; display: grid; gap: 8px; }
.foot-links a { color: rgba(255,255,255,.85); text-decoration: none; }
.foot-links a:hover { color: #fff; text-decoration: underline; }
.foot-meta { display: grid; gap: 14px; align-content: start; justify-items: start; }
.foot-meta p { margin: 0; }
.foot .langs a { color: rgba(255,255,255,.7); }
.foot .langs a[aria-current="true"] { color: #fff; border-color: rgba(255,255,255,.5); }

/* ── 窄螢幕 ── */
@media (max-width: 960px) {
  .hero-grid { grid-template-columns: 1fr; padding-left: 50px; gap: 40px; }
  .hero-art { width: min(72%, 300px); }
  .specimens { grid-template-columns: 1fr; gap: 44px; }
  .scrap-board { grid-template-columns: 1fr; row-gap: 40px; }
  .s1, .s2, .s3 { grid-column: 1; margin-top: 0; }
  .scrap-item .snap, .s1 .snap { max-width: 280px; }
  .s2 .snap { margin-left: auto; }
  .s2 .sticky { margin: -110px auto 0 0; }
  .sticky.alt { margin-left: 30px; }
  .lib-grid { grid-template-columns: 1fr; gap: 64px; }
  .spec { grid-template-columns: 1fr; gap: 18px; }
  .spec dl { grid-template-columns: 1fr; gap: 18px; }
  .shots { grid-template-columns: repeat(2, 1fr); gap: 24px; }
  .foot-grid { grid-template-columns: 1fr; gap: 28px; }
  .footnotes { grid-template-columns: 1fr; }
  .marks-sec .wrap, .closing-inner { padding-left: 60px; }
  .page-head-inner { padding-left: 50px; }
}
@media (max-width: 700px) {
  body { font-size: 17px; }
  .hero { padding: 36px 0 70px; }
  .hero-grid { padding-left: 50px; }
  .page-head-inner { padding-left: 32px; }
  .marks-sec .wrap, .closing-inner { padding-left: 42px; }
  .cell { width: 64px; height: 64px; }
  .glyph { font-size: 44px; }
  .cell.big { width: 128px; height: 128px; }
  .cell.big .glyph { font-size: 88px; }
  .sec-title { grid-template-columns: 1fr; }
  .sec-title .sec-no { justify-self: start; margin-bottom: 12px; }
  .sec-title p { grid-column: 1; }
  .modes-sec, .nots, .notes-sec { padding: 72px 0; }
  .nots-post { font-size: 25px; }
  .marks-sec { padding: 72px 0 130px; }
  .days { grid-template-columns: repeat(5, 1fr); }
  .gap-note { left: 30%; width: 190px; font-size: 15px; }
  .shelf { height: 250px; gap: 6px; padding: 0 4px; }
  .sp0 { width: 60px; height: 236px; } .sp1 { width: 54px; height: 210px; } .sp2 { width: 48px; height: 190px; } .sp3 { width: 50px; height: 200px; }
  .spine { font-size: 15px; }
  .toc { padding: 28px 22px 20px; }
  .closing { padding: 80px 0 90px; }
  .contact-card { padding: 28px 20px 22px; }
  .btn-lg { padding: 13px 22px; font-size: 17px; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } .caret { animation: none; } .card, .nav ul a::after { transition: none; } }

/* ── 捲動進場動畫：只在有 JS 時生效（html.js），沒 JS 內容照常顯示；首屏不做，避免拖慢 LCP ── */
.js .rv { opacity: 0; translate: 0 26px; transition: opacity .7s ease, translate .7s cubic-bezier(.2,.7,.2,1); transition-delay: calc(var(--i, 0) * 90ms); }
.js .rv.is-in { opacity: 1; translate: 0 0; }
.js .rv-draw path { stroke-dasharray: 1; stroke-dashoffset: 1; transition: stroke-dashoffset .9s ease .25s; }
.js .is-in .rv-draw path, .js .rv-draw.is-in path { stroke-dashoffset: 0; }
.js .nots-list li:nth-child(2) .doodle-strike path { transition-delay: .45s; }
.js .nots-list li:nth-child(3) .doodle-strike path { transition-delay: .65s; }
.js .nots-list li:nth-child(4) .doodle-strike path { transition-delay: .85s; }
.js .nots-list li:nth-child(5) .doodle-strike path { transition-delay: 1.05s; }
.js .days .stamp { opacity: 0; scale: 1.8; transition: opacity .25s, scale .35s cubic-bezier(.3,1.6,.5,1); transition-delay: calc(var(--n, 0) * 45ms + .2s); }
.js .calendar.is-in .stamp { opacity: 1; scale: 1; }
.js .shelf .spine { translate: 0 40px; opacity: 0; transition: translate .6s cubic-bezier(.2,.8,.2,1), opacity .4s; transition-delay: calc(var(--i, 0) * 110ms); }
.js .shelf.is-in .spine { translate: 0 0; opacity: 1; }
.js .snap.rv { translate: 0 44px; }
.js .snap.rv.is-in { translate: 0 0; }
@media (prefers-reduced-motion: reduce) {
  .js .rv, .js .days .stamp, .js .shelf .spine { opacity: 1; translate: none; scale: none; transition: none; }
  .js .rv-draw path { stroke-dashoffset: 0; transition: none; }
}

/* 手機點擊目標至少 24px（Lighthouse 無障礙檢查） */
.foot-links a { display: inline-block; padding: 5px 0; }
.back { display: inline-block; padding: 6px 0; }
.foot .mail, .foot .langs a { padding-top: 5px; padding-bottom: 5px; }

/* ── 手機版調整 ── */
.swipe-hint { display: none; }
@media (max-width: 700px) {
  .hero h1 { font-size: clamp(24px, 6.9vw, 34px); }
  .hero-art { width: min(64%, 240px); padding-top: 18px; }
  .scribble-note { font-size: 16px; }
  /* 三種寫法：字格在左、說明在右 */
  .specimens { gap: 30px; }
  .specimens li { display: grid; grid-template-columns: 104px 1fr; column-gap: 18px; align-items: start; }
  .specimens .cell.big { width: 104px; height: 104px; grid-row: 1 / span 2; }
  .specimens .cell.big .glyph { font-size: 70px; }
  .specimens.wide .cell.big { min-width: 104px; padding: 0 10px; }
  .specimens.wide .cell.big .glyph, .specimens.wide .typed { font-size: 34px; }
  .typed { font-size: 44px; }
  .cell.copy .model { font-size: 16px; top: 4px; left: 6px; }
  .specimens h3 { margin: 0 0 4px; font-size: 19px; }
  .specimens p { font-size: 15.5px; }
  /* 剪貼簿：左右滑的卡片列 */
  .scrap { padding-bottom: 72px; }
  .scrap-board { display: flex; gap: 22px; overflow-x: auto; scroll-snap-type: x mandatory; -webkit-overflow-scrolling: touch; scrollbar-width: none;
    margin: 0 calc(-1 * var(--gutter)); padding: 26px var(--gutter) 34px; }
  .scrap-board::-webkit-scrollbar { display: none; }
  .scrap-item { flex: 0 0 min(66%, 280px); scroll-snap-align: center; }
  .s1, .s2, .s3 { margin-top: 0; }
  .scrap-item .snap, .s1 .snap { max-width: none; margin: 0 auto; }
  .sticky, .s2 .sticky, .sticky.alt { margin: -90px 0 0 14px; max-width: none; padding: 16px 16px 14px; }
  .sticky h3 { font-size: 17px; }
  .sticky p { font-size: 14.5px; }
  .swipe-hint { display: flex; align-items: center; justify-content: flex-end; gap: 8px; margin: 4px 0 0; color: var(--primary); font-size: 15px; }
  .swipe-hint .doodle-arrow { width: 40px; height: 24px; stroke-width: 3; color: var(--sky); }
  .shelf-legend div { grid-template-columns: 64px 1fr; }
  .shelf-legend dd span { display: block; margin: 0; }
}

.prose table { width: 100%; border-collapse: collapse; margin: 18px 0 26px; font-size: 16px; display: block; overflow-x: auto; }
.prose th, .prose td { text-align: left; padding: 10px 14px 10px 0; border-bottom: 1.5px dashed var(--line-2); color: var(--text-2); vertical-align: top; min-width: 90px; }
.prose th { color: var(--text); border-bottom: 2px solid var(--sky); font-weight: 700; white-space: nowrap; }
.related { margin-top: 56px; padding-top: 28px; border-top: 1.5px dashed var(--line-2); }
.related h2 { font-size: 22px; margin: 0 0 14px; }
.related ul { list-style: none; padding: 0; }
.related li { margin: 8px 0; }
.related a { text-decoration: none; }
.related a::before { content: '→ '; color: var(--sky); }
.crumbs { font-size: 15px; color: var(--text-3); margin: 0; }
.crumbs a { text-decoration: none; }
.crumbs span { margin: 0 6px; color: var(--faint); }
