/* ============================================================
中文自學網站 — 全站樣式
設計語言：Readwise 風格 — 靜謐紙白、襯線標題、一抹藍與螢光筆黃
============================================================ */

:root {
/* 色彩 token（Readwise Style Reference） */
--color-bg: #F1F5F8; /* Page Mist：偏藍的宣紙底色 */
--color-surface: #FFFFFF; /* Paper White：卡片底色 */
--color-surface-raised: #FFFFFF;
--color-ink: #1F1F1F; /* Ink：主要文字，近黑而非純黑 */
--color-ink-soft: #55595E; /* 次要文字，由 Deep Slate 調淡 */
--color-ink-faint: #8A9099; /* 弱化文字 */
--color-accent: #478CD0; /* Pen Blue：唯一的強調藍，取代硃紅 */
--color-accent-soft: #E8F1FB; /* Pen Blue 淺底 */
--color-jade: #2F855A; /* 沿用做「正確／可用」語境色，非原色板但保留功能位 */
--color-jade-soft: #E6F4EC;
--color-dusk: #2D2F33; /* Deep Slate：陰景/中性語境 */
--color-dusk-soft: #E9ECF1;
--color-error: #C0392B;
--color-error-soft: #FBEAE7;
--color-success: #2F855A;
--color-success-soft: #E6F4EC;
--color-border: #E2E8F0; /* hairline，由 Page Mist 家族推導 */
--color-divider: #E6EBF0;
--color-highlighter: #FFF7CA; /* Highlighter Yellow：螢光筆強調，網站的招牌視覺 */
--color-reader-orange: #FB9100; /* Reader Orange：極少量的徽章色 */
--color-true-black: #000000;

/* 字體：優先使用系統內建中西文字體，避免首屏依賴第三方字體網絡請求。 */
--font-display: "Charter", "Iowan Old Style", "Palatino Linotype", "Songti TC", "Noto Serif TC", "PMingLiU", serif;
--font-body: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", sans-serif;
--font-data: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", sans-serif;

/* 圓角 / 陰影：印刷卡片感，幾乎無陰影，改用 hairline 邊框分層 */
--radius-lg: 16px;
--radius-md: 10px;
--radius-sm: 10px;
--shadow-card: 0 2px 8px rgba(31,31,31,0.08);
--shadow-card-hover: 0 4px 14px rgba(31,31,31,0.10);
--shadow-pressed: inset 0 1px 3px rgba(31,31,31,0.10);

/* 間距（4px 基礎單位） */
--space-1: 4px; --space-2: 8px; --space-3: 12px; --space-4: 20px;
--space-5: 24px; --space-6: 40px; --space-7: 48px; --space-8: 64px;

--max-width: 880px;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

body {
margin: 0;
background: var(--color-bg);
color: var(--color-ink);
font-family: var(--font-body);
font-feature-settings: "tnum" on, "lnum" on;
letter-spacing: -0.02em;
line-height: 1.5;
-webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
button { font-family: inherit; }

/* ---------- 版面骨架 ---------- */
#app-header {
position: sticky; top: 0; z-index: 50;
background: rgba(255,255,255,0.9);
backdrop-filter: blur(10px);
border-bottom: 1px solid var(--color-border);
}

.header-inner {
max-width: var(--max-width);
margin: 0 auto;
padding: 14px var(--space-4);
display: flex; align-items: center; gap: var(--space-3);
}

.brand {
font-family: var(--font-display);
font-weight: 600;
font-size: 18px;
letter-spacing: normal;
color: var(--color-ink);
flex: 1;
display: flex;
align-items: baseline;
gap: 6px;
cursor: pointer;
}


.header-crumb {
font-size: 13px;
color: var(--color-ink-soft);
max-width: 55%;
overflow: hidden;
text-overflow: ellipsis;
white-space: nowrap;
}

#app-main {
max-width: var(--max-width);
margin: 0 auto;
padding: var(--space-5) var(--space-4) var(--space-8);
min-height: 60vh;
}

/* ---------- 卡片：印刷卡片，hairline 邊框，近乎無陰影 ---------- */
.card {
background: var(--color-surface);
border-radius: var(--radius-lg);
box-shadow: var(--shadow-card);
border: 1px solid var(--color-border);
padding: var(--space-4);
margin-bottom: var(--space-4);
}

.card-tight { padding: var(--space-3); }
.card-tappable { cursor: pointer; transition: transform .15s ease, box-shadow .15s ease; }
.card-tappable:hover { box-shadow: var(--shadow-card-hover); transform: translateY(-2px); }
.card-tappable:active { transform: translateY(0); box-shadow: var(--shadow-pressed); }

/* ---------- 標題：Charter 襯線體，緊排版 ---------- */
.page-title {
font-family: var(--font-display);
font-size: 29px;
font-weight: 400;
line-height: 1.13;
letter-spacing: normal;
margin: 0 0 var(--space-1);
color: var(--color-ink);
}

.page-subtitle {
font-size: 15px;
color: var(--color-ink-soft);
margin: 0 0 var(--space-5);
}

.section-title {
font-family: var(--font-display);
font-size: 22px;
font-weight: 600;
line-height: 1.25;
margin: 0 0 var(--space-3);
display: flex; align-items: center; gap: var(--space-2);
}

.section-title .seal {
display: inline-flex; align-items: center; justify-content: center;
width: 28px; height: 28px; border-radius: 8px;
background: var(--color-accent); color: #fff; font-size: 13px; font-weight: 700;
flex-shrink: 0;
font-family: var(--font-body);
}

/* ---------- 首頁：12篇地圖 ---------- */
.map-grid {
display: grid;
grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
gap: var(--space-4);
}

.map-card {
position: relative;
padding: var(--space-4);
}

.map-card .map-group { font-size: 12px; color: var(--color-ink-faint); margin-bottom: 2px; }
.map-card .map-title {
font-family: var(--font-display); font-size: 19px; font-weight: 600;
margin: 0 0 4px;
}

.map-card .map-author { font-size: 13px; color: var(--color-ink-soft); margin: 0; }
.badge {
position: absolute; top: var(--space-4); right: var(--space-4);
font-size: 11px; padding: 2px 8px; border-radius: 10px;
font-weight: 700; letter-spacing: -0.02em;
}

.badge-available { background: var(--color-jade-soft); color: var(--color-jade); }
.badge-soon { background: var(--color-dusk-soft); color: var(--color-ink-faint); }
.map-card.is-disabled { opacity: 0.6; cursor: default; }
.map-card.is-disabled:hover { transform: none; box-shadow: var(--shadow-card); }

/* ---------- 篇章首頁：模組列表 ---------- */
.module-grid {
display: grid;
grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
gap: var(--space-4);
}

.module-card { display: flex; gap: var(--space-3); align-items: flex-start; }
.module-icon {
width: 36px; height: 36px; border-radius: var(--radius-sm);
background: var(--color-accent); color: #fff;
display: flex; align-items: center; justify-content: center;
font-size: 16px; flex-shrink: 0;
}

.module-name { font-weight: 700; font-size: 16px; margin: 0 0 2px; }
.module-desc { font-size: 13px; color: var(--color-ink-soft); margin: 0; }

.cross-text-banner {
border: 1px dashed var(--color-border);
border-radius: var(--radius-md);
padding: var(--space-3) var(--space-4);
font-size: 13px;
color: var(--color-ink-soft);
background: var(--color-bg);
margin: var(--space-2) 0 var(--space-5);
}

/* ---------- 原文段落 ---------- */
.text-passage {
font-family: var(--font-display);
font-size: 19px;
line-height: 2.1;
letter-spacing: normal;
}

.text-passage .term {
cursor: pointer;
background: var(--color-highlighter);
border-bottom: none;
color: var(--color-ink);
border-radius: 2px;
padding: 0 1px;
}

.text-passage .term:hover { background: #FFEE9C; }
.para-summary {
margin-top: var(--space-3);
font-size: 13px;
color: var(--color-ink-soft);
background: var(--color-bg);
border: 1px solid var(--color-border);
border-radius: var(--radius-sm);
padding: var(--space-3);
font-family: var(--font-body);
}

.para-nav { display: flex; gap: var(--space-2); flex-wrap: wrap; margin-bottom: var(--space-4); }
.para-nav button {
border: 1px solid var(--color-border); background: var(--color-surface);
border-radius: var(--radius-sm); padding: 6px 14px; font-size: 13px; cursor: pointer;
color: var(--color-ink-soft); font-family: var(--font-body); font-weight: 600;
}

.para-nav button.is-active { background: var(--color-accent); border-color: var(--color-accent); color: #fff; }

/* ---------- 注釋彈窗 ---------- */
.annotation-popover {
position: fixed; z-index: 200;
max-width: 300px;
background: var(--color-ink);
color: #fff;
padding: var(--space-3) var(--space-4);
border-radius: var(--radius-md);
font-size: 14px;
line-height: 1.6;
box-shadow: 0 10px 30px rgba(0,0,0,0.25);
font-family: var(--font-body);
}

.annotation-popover .term-name { font-weight: 700; color: var(--color-highlighter); margin-bottom: 4px; font-family: var(--font-display); font-size: 16px; }
.annotation-popover .reading { font-size: 12px; opacity: 0.7; margin-bottom: 4px; }
.annotation-backdrop { position: fixed; inset: 0; z-index: 199; }

/* ---------- 按鈕：單一實心藍色主按鈕，其餘皆為 ghost/text ---------- */
.btn {
display: inline-flex; align-items: center; justify-content: center; gap: 6px;
border-radius: var(--radius-lg);
padding: 10px 24px;
font-size: 14px; font-weight: 600;
letter-spacing: -0.02em;
border: 1px solid transparent;
cursor: pointer;
font-family: var(--font-body);
transition: opacity .15s ease, transform .1s ease;
}

.btn:active { transform: scale(0.97); }
.btn-primary { background: var(--color-accent); color: #fff; }
.btn-primary:hover { opacity: 0.92; }
.btn-primary:disabled { background: #C7D6E8; color: #fff; cursor: not-allowed; }
.btn-secondary { background: var(--color-surface); color: var(--color-ink); border-color: var(--color-true-black); border-width: 1px; }
.btn-secondary:hover { background: var(--color-bg); }
.btn-ghost { background: transparent; color: var(--color-ink-soft); }
.btn-ghost:hover { color: var(--color-ink); }
.btn-block { width: 100%; }
.btn-row { display: flex; gap: var(--space-3); flex-wrap: wrap; margin-top: var(--space-4); }

/* ---------- 底部固定導覽（題目頁） ---------- */
.quiz-nav-bar {
position: sticky; bottom: 0; z-index: 40;
background: rgba(255,255,255,0.92);
backdrop-filter: blur(10px);
border-top: 1px solid var(--color-border);
padding: var(--space-3) var(--space-4);
margin: var(--space-6) calc(var(--space-4) * -1) 0;
}

.quiz-nav-inner {
max-width: var(--max-width); margin: 0 auto;
display: flex; align-items: center; justify-content: space-between; gap: var(--space-2);
flex-wrap: wrap;
}

.quiz-nav-group { display: flex; gap: var(--space-2); flex-wrap: wrap; }
.quiz-progress-label { font-size: 13px; color: var(--color-ink-soft); }

/* ---------- 題目卡 ---------- */
.q-meta-row { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: var(--space-3); }
.tag {
font-size: 11px; padding: 2px 8px; border-radius: 10px;
background: var(--color-dusk-soft); color: var(--color-dusk); font-weight: 700;
font-family: var(--font-body); letter-spacing: -0.02em;
}

.tag-score { background: var(--color-accent-soft); color: var(--color-accent); }
.q-stem { font-size: 17px; font-weight: 700; margin: 0 0 var(--space-4); line-height: 1.5; letter-spacing: -0.02em; }
.q-quote {
font-family: var(--font-display); font-size: 16px; line-height: 1.9;
background: var(--color-bg); border-left: 3px solid var(--color-accent);
padding: var(--space-3) var(--space-4); margin-bottom: var(--space-4); border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.option-list { display: flex; flex-direction: column; gap: var(--space-2); }
.option-item {
display: flex; align-items: center; gap: var(--space-3);
border: 1px solid var(--color-border); border-radius: var(--radius-md);
padding: var(--space-3) var(--space-4); cursor: pointer;
font-size: 15px; background: var(--color-surface);
transition: border-color .15s, background .15s;
font-family: var(--font-body);
}

.option-item:hover { border-color: var(--color-accent); }
.option-key {
width: 26px; height: 26px; border-radius: 50%;
border: 1.5px solid var(--color-border); flex-shrink: 0;
display: flex; align-items: center; justify-content: center;
font-size: 12px; font-weight: 700; color: var(--color-ink-soft);
font-family: var(--font-body);
}

.option-item.is-selected { border-color: var(--color-accent); background: var(--color-accent-soft); }
.option-item.is-selected .option-key { background: var(--color-accent); border-color: var(--color-accent); color: #fff; }
.option-item.is-correct { border-color: var(--color-success); background: var(--color-success-soft); }
.option-item.is-correct .option-key { background: var(--color-success); border-color: var(--color-success); color: #fff; }
.option-item.is-wrong { border-color: var(--color-error); background: var(--color-error-soft); }
.option-item.is-wrong .option-key { background: var(--color-error); border-color: var(--color-error); color: #fff; }
.option-item.is-locked { cursor: default; }

textarea.answer-input, input.answer-input {
width: 100%; border: 1px solid var(--color-border); border-radius: var(--radius-md);
padding: var(--space-3); font-size: 15px; font-family: var(--font-body); color: var(--color-ink);
background: var(--color-surface);
}

textarea.answer-input { min-height: 120px; resize: vertical; line-height: 1.5; }
textarea.answer-input:focus, input.answer-input:focus { outline: 2px solid var(--color-accent); border-color: transparent; }

table.fill-table { width: 100%; border-collapse: collapse; margin-bottom: var(--space-3); }
table.fill-table th, table.fill-table td {
border: 1px solid var(--color-border); padding: var(--space-3); font-size: 14px; text-align: left; vertical-align: top;
font-family: var(--font-body);
}

table.fill-table th { background: var(--color-bg); font-weight: 700; }
table.fill-table td.blank-cell textarea { width: 100%; min-height: 60px; border: 1px dashed var(--color-border); border-radius: var(--radius-sm); padding: var(--space-2); font-size: 14px; font-family: var(--font-body); }

/* ---------- 解析卡 ---------- */
.reveal-panel {
margin-top: var(--space-5);
border-radius: var(--radius-md);
padding: var(--space-4);
background: var(--color-success-soft);
border: 1px solid #C9E6D5;
}

.reveal-panel.is-incorrect { background: var(--color-error-soft); border-color: #F0C9C2; }
.reveal-row { margin-bottom: var(--space-2); font-size: 14px; }
.reveal-row b { font-weight: 700; }
.reveal-label { display: block; font-size: 11px; font-weight: 700; color: var(--color-ink-soft); text-transform: uppercase; letter-spacing: -0.02em; margin-bottom: 3px; }
.reveal-explanation { font-size: 14px; line-height: 1.8; white-space: pre-wrap; }
.scoring-elements { margin: 0; padding-left: 18px; font-size: 14px; line-height: 1.9; }

/* ---------- 我的掌握 ---------- */
.stat-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: var(--space-3); }
.stat-card { text-align: center; padding: var(--space-4) var(--space-2); }
.stat-value { font-family: var(--font-display); font-size: 29px; font-weight: 600; color: var(--color-accent); }
.stat-label { font-size: 12px; color: var(--color-ink-soft); margin-top: 4px; }
.bar-track { height: 8px; border-radius: 999px; background: var(--color-divider); overflow: hidden; margin-top: 6px; }
.bar-fill { height: 100%; background: var(--color-accent); border-radius: 999px; }

/* ---------- 提示 / 空狀態 / 錯誤 ---------- */
.empty-state { text-align: center; padding: var(--space-7) var(--space-4); color: var(--color-ink-soft); }
.error-banner {
background: var(--color-error-soft); color: var(--color-error);
border: 1px solid #F0C9C2; border-radius: var(--radius-md);
padding: var(--space-4); font-size: 14px; line-height: 1.7;
font-family: var(--font-data);
}

.loading-state { text-align: center; padding: var(--space-7); color: var(--color-ink-faint); font-size: 14px; }

/* ---------- 頁尾返回列 ---------- */
.footer-nav { display: flex; gap: var(--space-3); margin-top: var(--space-6); flex-wrap: wrap; }

/* ---------- 遮字 / 重組 ---------- */
.blank-token { display: inline-block; min-width: 1.4em; border-bottom: 2px solid var(--color-accent); text-align: center; }
.reorder-list { display: flex; flex-wrap: wrap; gap: var(--space-2); }
.reorder-chip {
border: 1px solid var(--color-border); border-radius: var(--radius-sm);
padding: 8px 12px; cursor: grab; background: var(--color-surface);
font-family: var(--font-display); font-size: 16px;
}

.reorder-chip.is-placed { opacity: 0.35; cursor: default; }
.reorder-slots { display: flex; flex-wrap: wrap; gap: var(--space-2); margin: var(--space-3) 0; min-height: 46px;
border: 1px dashed var(--color-border); border-radius: var(--radius-sm); padding: var(--space-2); }

/* ---------- 作者與背景卡片（details/summary） ---------- */
details.card summary {
font-family: var(--font-body);
}
details.card summary::-webkit-details-marker { display: none; }

@media (max-width: 640px) {
.page-title { font-size: 24px; }
.card { padding: var(--space-3); }
.header-crumb { display: none; }
}

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


/* ---------- Accessibility / keyboard interaction ---------- */
:where(a, button, input, textarea, select, [tabindex]):focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 3px;
}

button.option-item {
  width: 100%;
  min-height: 44px;
  text-align: left;
  font: inherit;
  color: inherit;
}

button.option-item:disabled {
  cursor: default;
  opacity: 1;
}

.text-passage button.term {
  appearance: none;
  display: inline;
  margin: 0;
  border: 0;
  font: inherit;
  line-height: inherit;
  letter-spacing: inherit;
}

.annotation-popover { position: fixed; }
.annotation-close {
  position: absolute;
  top: 6px;
  right: 8px;
  width: 32px;
  height: 32px;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: #fff;
  cursor: pointer;
  font-size: 22px;
  line-height: 1;
}
.annotation-close:hover { background: rgba(255,255,255,0.12); }

.reorder-chip[data-chip] {
  min-height: 44px;
  font: inherit;
  color: inherit;
  cursor: pointer;
}

.para-nav button,
.tf-btn,
.tf-btn-single,
.match-multi-btn {
  min-height: 44px;
}

@media (pointer: coarse) {
  .btn { min-height: 44px; }
}

/* ===== UI 2.0: modern editorial learning product ===== */
:root {
  --color-bg: #F4F3EF;
  --color-surface: #FCFCFA;
  --color-surface-raised: #FFFFFF;
  --color-ink: #17221F;
  --color-ink-soft: #596561;
  --color-ink-faint: #8A938F;
  --color-accent: #174940;
  --color-accent-strong: #0D3832;
  --color-accent-soft: #E2EFEA;
  --color-jade: #24705F;
  --color-jade-soft: #E3F1EC;
  --color-reader-orange: #B75F47;
  --color-coral-soft: #F4E5DF;
  --color-gold: #B88A4A;
  --color-border: rgba(45, 68, 62, .13);
  --color-divider: rgba(45, 68, 62, .10);
  --color-highlighter: #F2E4A9;
  --shadow-card: 0 8px 24px rgba(32, 50, 45, .045), 0 1px 2px rgba(32, 50, 45, .05);
  --shadow-card-hover: 0 18px 42px rgba(32, 50, 45, .10), 0 2px 8px rgba(32, 50, 45, .05);
  --radius-lg: 20px;
  --radius-md: 14px;
  --max-width: 1120px;
}

html { scroll-behavior: smooth; }
body {
  min-height: 100vh;
  background:
    radial-gradient(58rem 34rem at -4% -8%, rgba(112, 172, 152, .17), transparent 62%),
    radial-gradient(46rem 30rem at 104% 7%, rgba(196, 108, 77, .11), transparent 62%),
    linear-gradient(180deg, #F8F7F3 0%, var(--color-bg) 42%, #F3F1EC 100%);
  background-attachment: fixed;
}
::selection { background: rgba(183, 95, 71, .19); }
a, button { -webkit-tap-highlight-color: transparent; }
a:focus-visible, button:focus-visible, summary:focus-visible {
  outline: 3px solid rgba(183, 95, 71, .34);
  outline-offset: 3px;
}

/* Floating glass navigation */
#app-header {
  top: 0;
  padding: 12px 14px 0;
  background: transparent;
  border-bottom: 0;
  backdrop-filter: none;
  pointer-events: none;
}
.header-inner {
  min-height: 60px;
  padding: 10px 12px;
  border: 1px solid rgba(59, 77, 71, .12);
  border-radius: 19px;
  background: rgba(252, 252, 250, .78);
  box-shadow: 0 12px 34px rgba(31, 47, 42, .07), inset 0 1px 0 rgba(255,255,255,.72);
  backdrop-filter: blur(22px) saturate(145%);
  -webkit-backdrop-filter: blur(22px) saturate(145%);
  pointer-events: auto;
}
.brand {
  flex: 0 0 auto;
  align-items: center;
  gap: 9px;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 800;
  letter-spacing: -.01em;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 3px;
  margin-left: 10px;
  padding: 3px;
  border-radius: 12px;
  background: rgba(23,73,64,.045);
}
.header-nav-link {
  min-height: 34px;
  display: inline-flex;
  align-items: center;
  padding: 7px 12px;
  border-radius: 9px;
  color: var(--color-ink-soft);
  font-size: 12px;
  font-weight: 750;
  transition: background .16s ease, color .16s ease, transform .16s ease;
}
.header-nav-link:hover {
  background: rgba(255,255,255,.78);
  color: var(--color-accent);
  transform: translateY(-1px);
}
.header-crumb {
  margin-left: auto;
  max-width: 30%;
  padding: 0 8px;
  color: var(--color-ink-faint);
  font-size: 12px;
}
#app-main { padding-top: 34px; }

/* Global surfaces: cleaner depth, not a forest of borders */
.card {
  border-color: var(--color-border);
  background: rgba(252,252,250,.87);
  box-shadow: var(--shadow-card);
}
.card-tappable {
  transition: transform .18s cubic-bezier(.2,.8,.2,1), box-shadow .18s ease, border-color .18s ease, background .18s ease;
}
.card-tappable:hover {
  transform: translateY(-3px);
  border-color: rgba(23,73,64,.22);
  box-shadow: var(--shadow-card-hover);
}
.btn {
  min-height: 42px;
  border-radius: 13px;
  padding: 10px 18px;
  transition: transform .14s cubic-bezier(.2,.8,.2,1), box-shadow .16s ease, background .16s ease, color .16s ease, opacity .16s ease;
}
.btn-primary {
  background: linear-gradient(145deg, #1D5A50, var(--color-accent-strong));
  box-shadow: 0 9px 19px rgba(13,56,50,.15), inset 0 1px 0 rgba(255,255,255,.14);
}
.btn-primary:hover { opacity: 1; transform: translateY(-1px); box-shadow: 0 13px 24px rgba(13,56,50,.20); }
.btn-secondary { border-color: rgba(23,34,31,.28); }

.section-kicker,
.home-kicker,
.unit-kicker,
.home-action-eyebrow {
  margin: 0;
  color: var(--color-reader-orange);
  font-size: 11px;
  font-weight: 850;
  letter-spacing: .13em;
  text-transform: uppercase;
}

/* Home: split editorial hero */
.home-hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(310px, .88fr);
  align-items: center;
  gap: clamp(34px, 6vw, 74px);
  max-width: none;
  padding: 56px 0 62px;
  border-bottom: 0;
}
.home-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  left: -90px;
  top: 10px;
  width: 310px;
  height: 310px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(111,171,151,.12), rgba(111,171,151,0) 68%);
  filter: blur(2px);
  pointer-events: none;
}
.home-kicker-row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.home-edition-pill,
.unit-mode-pill {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  padding: 5px 9px;
  border: 1px solid rgba(23,73,64,.12);
  border-radius: 999px;
  background: rgba(255,255,255,.55);
  color: var(--color-accent);
  font-family: var(--font-data);
  font-size: 9px;
  font-weight: 850;
  letter-spacing: .13em;
}
.home-title {
  max-width: 700px;
  margin: 16px 0 22px;
  font-size: clamp(46px, 5.4vw, 74px);
  font-weight: 540;
  line-height: 1.035;
  letter-spacing: -.045em;
}
.home-title span {
  display: block;
  margin-top: 7px;
  color: var(--color-accent);
}
.home-lead {
  max-width: 650px;
  margin: 0;
  color: var(--color-ink-soft);
  font-size: 16px;
  line-height: 1.85;
}
.home-hero-chips {
  display: flex;
  gap: 7px;
  flex-wrap: wrap;
  margin-top: 25px;
}
.home-hero-chips span {
  padding: 7px 11px;
  border: 1px solid rgba(23,73,64,.10);
  border-radius: 999px;
  background: rgba(255,255,255,.49);
  color: #52605C;
  font-size: 11px;
  font-weight: 700;
}
.home-hero-visual {
  position: relative;
  overflow: hidden;
  min-height: 356px;
  padding: 24px;
  border: 1px solid rgba(23,73,64,.12);
  border-radius: 30px;
  background:
    radial-gradient(circle at 90% 2%, rgba(183,95,71,.15), transparent 35%),
    linear-gradient(145deg, rgba(255,255,255,.91), rgba(231,240,236,.76));
  box-shadow: 0 28px 70px rgba(37,55,49,.10), inset 0 1px 0 rgba(255,255,255,.72);
}
.home-hero-visual::after {
  content: "";
  position: absolute;
  right: -55px;
  bottom: -72px;
  width: 190px;
  height: 190px;
  border: 1px solid rgba(23,73,64,.10);
  border-radius: 50%;
  box-shadow: 0 0 0 34px rgba(23,73,64,.025), 0 0 0 68px rgba(23,73,64,.018);
  pointer-events: none;
}
.hero-visual-head {
  position: relative;
  z-index: 1;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 22px;
}
.hero-visual-head > div { display: grid; gap: 5px; }
.hero-visual-label {
  color: var(--color-reader-orange);
  font-family: var(--font-data);
  font-size: 9px;
  font-weight: 850;
  letter-spacing: .15em;
}
.hero-visual-head strong {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 650;
}
.hero-unit-count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 54px;
  height: 30px;
  border-radius: 999px;
  background: var(--color-accent);
  color: #fff;
  font-size: 11px;
  font-weight: 800;
}
.hero-path-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}
.hero-path-step {
  min-height: 102px;
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-rows: auto auto;
  align-items: center;
  column-gap: 11px;
  padding: 15px;
  border: 1px solid rgba(23,73,64,.09);
  border-radius: 17px;
  background: rgba(255,255,255,.61);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.72);
}
.hero-path-step > span {
  grid-row: 1 / span 2;
  color: rgba(23,73,64,.48);
  font-family: var(--font-data);
  font-size: 9px;
  font-weight: 850;
}
.hero-path-step strong {
  color: var(--color-accent);
  font-family: var(--font-display);
  font-size: 27px;
  line-height: 1;
}
.hero-path-step small { color: var(--color-ink-soft); font-size: 11px; }
.hero-visual-note {
  position: relative;
  z-index: 1;
  margin: 18px 0 0;
  color: var(--color-ink-faint);
  font-size: 10px;
  line-height: 1.55;
}

/* Home action bento */
.home-action-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, .65fr);
  gap: 15px;
  margin: 2px 0 70px;
}
.home-action-card {
  position: relative;
  overflow: hidden;
  min-height: 252px;
  padding: 30px;
  border-radius: 28px;
}
.home-action-primary {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  background:
    radial-gradient(circle at 86% 8%, rgba(255,255,255,.16), transparent 30%),
    linear-gradient(135deg, #1D594F 0%, #0E3A34 100%);
  color: #FEFDF9;
  border: 0;
  box-shadow: 0 22px 50px rgba(13,56,50,.16), inset 0 1px 0 rgba(255,255,255,.15);
}
.home-action-primary::after {
  content: "";
  position: absolute;
  right: -70px;
  bottom: -105px;
  width: 260px;
  height: 260px;
  border: 1px solid rgba(255,255,255,.11);
  border-radius: 50%;
  box-shadow: 0 0 0 42px rgba(255,255,255,.035), 0 0 0 84px rgba(255,255,255,.02);
}
.home-action-primary > * { position: relative; z-index: 1; }
.home-action-primary .home-action-eyebrow { color: #BFDAD1; }
.home-action-primary .home-action-meta { color: #D9E7E2; }
.home-action-primary .home-action-copy { color: rgba(255,255,255,.74); }
.home-action-secondary {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: start;
  gap: 18px;
  border: 1px solid rgba(23,73,64,.11);
  background: rgba(252,252,250,.74);
  box-shadow: 0 15px 38px rgba(37,55,49,.055), inset 0 1px 0 rgba(255,255,255,.72);
}
.home-action-symbol {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 15px;
  background: var(--color-accent-soft);
  color: var(--color-accent);
  font-family: var(--font-display);
  font-size: 18px;
  box-shadow: inset 0 0 0 1px rgba(23,73,64,.08);
}
.home-action-title {
  margin: 8px 0 4px;
  font-family: var(--font-display);
  font-size: 29px;
  font-weight: 650;
  line-height: 1.16;
}
.home-action-meta { margin: 0 0 16px; font-size: 13px; }
.home-action-copy {
  max-width: 540px;
  margin: 12px 0 22px;
  color: var(--color-ink-soft);
  font-size: 14px;
  line-height: 1.75;
}
.home-action-button {
  margin-top: auto;
  border: 1px solid rgba(255,255,255,.18);
  border-radius: 13px;
  background: rgba(255,255,255,.96);
  color: var(--color-accent-strong);
  box-shadow: 0 10px 22px rgba(0,0,0,.09);
}
.home-action-button:hover { transform: translateY(-2px); }
.home-text-link {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  gap: 8px;
  color: var(--color-accent);
  font-size: 13px;
  font-weight: 800;
}
.home-text-link:hover { text-decoration: none; transform: translateX(2px); }
.home-curriculum { margin-bottom: 42px; }
.home-section-heading,
.unit-section-heading {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 34px;
  margin-bottom: 22px;
}
.home-section-heading h2,
.unit-section-heading h2,
.cross-text-panel h2,
.next-step-panel h2 {
  margin: 5px 0 0;
  font-family: var(--font-display);
  font-size: 29px;
  font-weight: 650;
  line-height: 1.22;
}
.home-section-heading > p,
.unit-section-heading > p {
  max-width: 400px;
  margin: 0;
  color: var(--color-ink-soft);
  font-size: 12px;
  line-height: 1.7;
}

/* Curriculum: a clean 4 × n modern collection grid */
.map-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}
.map-card {
  position: relative;
  min-height: 184px;
  margin: 0;
  padding: 20px;
  overflow: hidden;
  border: 1px solid rgba(23,73,64,.105);
  border-radius: 20px;
  background: rgba(252,252,250,.72);
  box-shadow: 0 9px 25px rgba(36,52,47,.035), inset 0 1px 0 rgba(255,255,255,.7);
}
.map-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), rgba(23,73,64,0));
  opacity: 0;
  transition: opacity .18s ease;
}
.map-card.card-tappable:hover::before { opacity: 1; }
.map-card.card-tappable:hover {
  transform: translateY(-4px);
  border-color: rgba(23,73,64,.20);
  background: rgba(255,255,255,.93);
  box-shadow: 0 20px 40px rgba(31,48,43,.085);
}
.map-card-top {
  display: flex;
  min-height: 31px;
  justify-content: space-between;
  align-items: flex-start;
  gap: 9px;
  margin-bottom: 23px;
}
.map-card-meta { display: flex; align-items: center; gap: 8px; min-width: 0; }
.map-sequence {
  color: rgba(23,73,64,.43);
  font-family: var(--font-data);
  font-size: 9px;
  font-weight: 850;
  letter-spacing: .10em;
}
.map-card .map-group {
  margin: 0;
  color: var(--color-reader-orange);
  font-size: 9px;
  font-weight: 850;
  letter-spacing: .08em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.map-card .badge {
  position: static;
  flex: none;
  padding: 3px 7px;
  font-size: 9px;
}
.map-card .map-title {
  max-width: 88%;
  margin: 0 0 7px;
  font-size: 22px;
  font-weight: 650;
  line-height: 1.21;
}
.map-card .map-author { font-size: 12px; }
.map-arrow {
  position: absolute;
  right: 19px;
  bottom: 18px;
  display: grid;
  place-items: center;
  width: 31px;
  height: 31px;
  border-radius: 50%;
  background: rgba(23,73,64,.06);
  color: var(--color-accent);
  font-size: 14px;
  transition: transform .18s ease, background .18s ease;
}
.map-card:hover .map-arrow { transform: translateX(2px); background: var(--color-accent-soft); }

/* Unit hero: a distinctive editorial object instead of a plain heading */
.unit-hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 42px;
  align-items: center;
  min-height: 330px;
  margin: 10px 0 20px;
  padding: 42px 44px;
  overflow: hidden;
  border: 1px solid rgba(23,73,64,.11);
  border-radius: 32px;
  background:
    radial-gradient(circle at 92% 8%, rgba(183,95,71,.12), transparent 31%),
    linear-gradient(140deg, rgba(255,255,255,.90), rgba(230,239,235,.76));
  box-shadow: 0 26px 65px rgba(34,51,45,.085), inset 0 1px 0 rgba(255,255,255,.76);
}
.unit-hero::before {
  content: "";
  position: absolute;
  left: -100px;
  bottom: -150px;
  width: 340px;
  height: 340px;
  border: 1px solid rgba(23,73,64,.07);
  border-radius: 50%;
  box-shadow: 0 0 0 48px rgba(23,73,64,.018), 0 0 0 96px rgba(23,73,64,.012);
}
.unit-hero-copy { position: relative; z-index: 1; }
.unit-meta-row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.unit-title {
  margin: 13px 0 10px;
  font-size: clamp(48px, 6.8vw, 76px);
  font-weight: 540;
  line-height: 1.02;
  letter-spacing: -.05em;
}
.unit-author { margin: 0; color: var(--color-ink-soft); font-size: 15px; }
.unit-flow-mini {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 28px;
  color: var(--color-ink-soft);
  font-size: 11px;
  font-weight: 700;
}
.unit-flow-mini span {
  padding: 6px 9px;
  border: 1px solid rgba(23,73,64,.10);
  border-radius: 999px;
  background: rgba(255,255,255,.56);
}
.unit-flow-mini i { color: rgba(23,73,64,.36); font-style: normal; }
.unit-hero-art {
  position: relative;
  z-index: 1;
  min-height: 230px;
  display: grid;
  place-items: center;
}
.unit-monogram {
  position: relative;
  z-index: 2;
  display: grid;
  place-items: center;
  width: 142px;
  height: 142px;
  border-radius: 38px;
  background: linear-gradient(145deg, #215F54, #103A34);
  color: #FFFDF8;
  box-shadow: 0 24px 48px rgba(13,56,50,.20), inset 0 1px 0 rgba(255,255,255,.18);
  font-family: var(--font-display);
  font-size: 72px;
  font-weight: 500;
  transform: rotate(-3deg);
}
.unit-art-orbit {
  position: absolute;
  border: 1px solid rgba(23,73,64,.12);
  border-radius: 50%;
}
.orbit-one { width: 206px; height: 206px; }
.orbit-two { width: 260px; height: 260px; opacity: .58; }
.unit-art-caption {
  position: absolute;
  z-index: 3;
  bottom: 0;
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(255,255,255,.72);
  color: var(--color-reader-orange);
  font-size: 9px;
  font-weight: 850;
  letter-spacing: .16em;
  box-shadow: 0 5px 16px rgba(39,54,49,.06);
}

/* Next step is the second focal surface */
.next-step-panel {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 30px;
  align-items: center;
  margin: 18px 0 62px;
  padding: 28px 30px 28px 34px;
  overflow: hidden;
  border: 0;
  border-radius: 24px;
  background:
    radial-gradient(circle at 96% 4%, rgba(255,255,255,.14), transparent 28%),
    linear-gradient(135deg, #1A5249, #0D3832);
  color: #FFFDF9;
  box-shadow: 0 18px 42px rgba(13,56,50,.14), inset 0 1px 0 rgba(255,255,255,.14);
}
.next-step-panel::before {
  content: "NEXT";
  position: absolute;
  right: 28px;
  top: -18px;
  color: rgba(255,255,255,.055);
  font-family: var(--font-data);
  font-size: 74px;
  font-weight: 900;
  letter-spacing: -.05em;
}
.next-step-panel .section-kicker { color: #BFD9D1; }
.next-step-panel h2 { color: #FFFDF9; }
.next-step-reason { max-width: 720px; margin: 9px 0 5px; color: rgba(255,255,255,.88); line-height: 1.7; }
.next-step-note { max-width: 760px; margin: 0; color: rgba(255,255,255,.55); font-size: 10px; line-height: 1.6; }
.next-step-button {
  position: relative;
  z-index: 1;
  white-space: nowrap;
  border: 1px solid rgba(255,255,255,.18);
  background: rgba(255,255,255,.96);
  color: var(--color-accent-strong);
  box-shadow: 0 10px 20px rgba(0,0,0,.10);
}
.next-step-button:hover { color: var(--color-accent-strong); background: #fff; }

/* Real Bento module hierarchy */
.unit-section { margin: 0 0 64px; }
.unit-section-heading.compact { margin-bottom: 18px; }
.module-grid-core {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  grid-auto-rows: minmax(124px, auto);
  grid-auto-flow: dense;
  gap: 12px;
}
.module-grid-practice { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
.module-card {
  position: relative;
  min-height: 138px;
  margin: 0;
  padding: 22px 50px 22px 20px;
  overflow: hidden;
  align-items: center;
  gap: 14px;
  border: 1px solid rgba(23,73,64,.105);
  border-radius: 22px;
  background: rgba(252,252,250,.76);
  box-shadow: 0 9px 24px rgba(33,49,44,.035), inset 0 1px 0 rgba(255,255,255,.68);
}
.module-card.card-tappable:hover {
  transform: translateY(-3px);
  border-color: rgba(23,73,64,.20);
  background: rgba(255,255,255,.94);
  box-shadow: 0 19px 40px rgba(31,48,43,.085);
}
.module-grid-core .module-card { grid-column: span 6; }
.module-grid-core .module-card-text {
  grid-column: span 7;
  grid-row: span 2;
  min-height: 288px;
}
.module-grid-core .module-card-words,
.module-grid-core .module-card-comprehension { grid-column: span 5; }
.module-card-featured {
  align-items: flex-end;
  padding: 28px;
  background:
    radial-gradient(circle at 85% 15%, rgba(255,255,255,.13), transparent 30%),
    linear-gradient(145deg, #1E5B51, #0E3A34);
  border-color: transparent;
  color: #FFFDF8;
  box-shadow: 0 20px 44px rgba(13,56,50,.14), inset 0 1px 0 rgba(255,255,255,.14);
}
.module-card-featured.card-tappable:hover {
  background: linear-gradient(145deg, #24665A, #103F38);
  border-color: transparent;
  box-shadow: 0 25px 50px rgba(13,56,50,.19);
}
.module-order {
  position: absolute;
  top: 15px;
  right: 17px;
  color: rgba(23,73,64,.39);
  font-family: var(--font-data);
  font-size: 9px;
  font-weight: 850;
  letter-spacing: .10em;
}
.module-icon {
  width: 42px;
  height: 42px;
  border: 1px solid rgba(23,73,64,.12);
  border-radius: 14px;
  background: var(--color-accent-soft);
  color: var(--color-accent);
  font-family: var(--font-display);
  font-size: 16px;
  box-shadow: inset 0 1px 0 rgba(255,255,255,.65);
}
.module-card-featured .module-icon {
  width: 54px;
  height: 54px;
  border-color: rgba(255,255,255,.16);
  background: rgba(255,255,255,.10);
  color: #fff;
  font-size: 20px;
  box-shadow: none;
}
.module-copy { min-width: 0; }
.module-name {
  margin-bottom: 5px;
  color: var(--color-ink);
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 650;
}
.module-desc { font-size: 12px; line-height: 1.55; }
.module-card-featured .module-name { color: #fff; font-size: 28px; }
.module-card-featured .module-desc { max-width: 360px; color: rgba(255,255,255,.69); font-size: 13px; }
.module-card-featured .module-order { color: rgba(255,255,255,.45); }
.module-arrow {
  position: absolute;
  right: 18px;
  bottom: 18px;
  display: grid;
  place-items: center;
  width: 31px;
  height: 31px;
  border-radius: 50%;
  background: rgba(23,73,64,.055);
  color: var(--color-accent);
  transition: transform .18s ease, background .18s ease;
}
.module-card-featured .module-arrow { background: rgba(255,255,255,.10); color: #fff; }
.module-card:hover .module-arrow { transform: translateX(2px); background: var(--color-accent-soft); }
.module-card-featured:hover .module-arrow { background: rgba(255,255,255,.16); }
.module-card-challenge { background: linear-gradient(145deg, rgba(244,229,223,.88), rgba(252,252,250,.82)); }
.module-card-progress { background: linear-gradient(145deg, rgba(226,239,234,.88), rgba(252,252,250,.82)); }
.background-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.background-grid .card {
  margin: 0;
  border-radius: 20px;
  background: rgba(252,252,250,.65);
  box-shadow: 0 7px 20px rgba(34,50,45,.025);
}
.background-grid summary { color: var(--color-accent); }
.unit-background-section { margin-bottom: 46px; }
.cross-text-panel {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 30px;
  padding: 24px 27px;
  border: 1px solid rgba(23,73,64,.10);
  border-radius: 20px;
  background: rgba(255,255,255,.45);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.65);
}
.cross-text-panel h2 { font-size: 23px; }
.cross-text-panel p:not(.section-kicker) { margin: 7px 0 0; color: var(--color-ink-soft); font-size: 12px; }
.unit-footer-nav { margin-top: 32px; }

/* Gentle route-level entrance; reduced-motion users get no animation. */
.home-hero,
.home-action-grid,
.home-curriculum,
.unit-hero,
.next-step-panel,
.unit-section,
.cross-text-panel {
  animation: ui-surface-in .42s cubic-bezier(.2,.75,.2,1) both;
}
.home-action-grid,
.next-step-panel { animation-delay: .035s; }
.home-curriculum,
.unit-section { animation-delay: .065s; }
@keyframes ui-surface-in {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 960px) {
  .home-hero { grid-template-columns: 1fr; gap: 30px; padding-top: 38px; }
  .home-hero-copy { max-width: 800px; }
  .home-hero-visual { min-height: 0; }
  .home-action-grid { grid-template-columns: 1fr; margin-bottom: 54px; }
  .home-action-card { min-height: 0; }
  .map-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .unit-hero { grid-template-columns: minmax(0, 1fr) 220px; padding: 34px; }
  .unit-monogram { width: 124px; height: 124px; font-size: 62px; }
  .orbit-one { width: 180px; height: 180px; }
  .orbit-two { width: 222px; height: 222px; }
  .module-grid-core .module-card-text { grid-column: span 12; grid-row: auto; min-height: 218px; }
  .module-grid-core .module-card-words,
  .module-grid-core .module-card-comprehension,
  .module-grid-core .module-card-analysis,
  .module-grid-core .module-card-theme { grid-column: span 6; }
}

@media (max-width: 760px) {
  #app-header { padding: 9px 9px 0; }
  .header-inner { min-height: 54px; padding: 8px 9px; border-radius: 16px; }
  .header-crumb { display: none; }
  .brand-copy { font-size: 14px; }
  .header-nav { margin-left: auto; }
  #app-main { padding-top: 25px; }
  .home-title { font-size: clamp(42px, 11vw, 60px); }
  .home-section-heading,
  .unit-section-heading { align-items: flex-start; flex-direction: column; gap: 9px; }
  .unit-hero { grid-template-columns: 1fr; min-height: 0; gap: 26px; }
  .unit-hero-art { min-height: 190px; }
  .next-step-panel { grid-template-columns: 1fr; gap: 20px; }
  .next-step-button { justify-self: start; }
  .module-grid-practice { grid-template-columns: 1fr; }
}

@media (max-width: 560px) {
  .header-inner { padding: 8px; }
  .brand { gap: 7px; }
  
  .header-nav-link { min-height: 31px; padding: 6px 8px; font-size: 11px; }
  #app-main { padding-left: 16px; padding-right: 16px; }
  .quiz-nav-bar { margin-left: -16px; margin-right: -16px; }
  .home-hero { padding: 30px 0 40px; }
  .home-edition-pill { display: none; }
  .home-title { margin-top: 12px; font-size: 42px; line-height: 1.07; }
  .home-lead { font-size: 14px; line-height: 1.75; }
  .home-hero-chips { margin-top: 20px; }
  .home-hero-visual { padding: 17px; border-radius: 24px; }
  .hero-path-step { min-height: 78px; padding: 10px; }
  .hero-path-step strong { font-size: 22px; }
  .hero-path-step small { font-size: 10px; }
  .hero-visual-head { margin-bottom: 15px; }
  .hero-visual-head strong { font-size: 17px; }
  .hero-visual-note { display: none; }
  .home-action-card { padding: 23px; border-radius: 23px; }
  .home-action-secondary { grid-template-columns: 1fr; }
  .home-action-title { font-size: 25px; }
  .map-grid { grid-template-columns: 1fr; }
  .map-card { min-height: 158px; }
  .unit-hero { margin-top: 4px; padding: 26px 23px 23px; border-radius: 25px; }
  .unit-title { font-size: 46px; }
  .unit-flow-mini i { display: none; }
  .unit-hero-art { min-height: 170px; }
  .unit-monogram { width: 108px; height: 108px; border-radius: 30px; font-size: 54px; }
  .orbit-one { width: 154px; height: 154px; }
  .orbit-two { width: 190px; height: 190px; }
  .next-step-panel { margin-bottom: 48px; padding: 24px; border-radius: 21px; }
  .next-step-panel::before { font-size: 56px; right: 14px; }
  .unit-section { margin-bottom: 48px; }
  .module-grid-core { grid-template-columns: 1fr; }
  .module-grid-core .module-card,
  .module-grid-core .module-card-text,
  .module-grid-core .module-card-words,
  .module-grid-core .module-card-comprehension,
  .module-grid-core .module-card-analysis,
  .module-grid-core .module-card-theme { grid-column: auto; grid-row: auto; }
  .module-card { min-height: 116px; }
  .module-card-featured { min-height: 190px; align-items: flex-end; }
  .background-grid { grid-template-columns: 1fr; }
  .cross-text-panel { align-items: flex-start; flex-direction: column; gap: 10px; padding: 21px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .card-tappable,
  .btn,
  .header-nav-link,
  .map-arrow,
  .module-arrow,
  .home-hero,
  .home-action-grid,
  .home-curriculum,
  .unit-hero,
  .next-step-panel,
  .unit-section,
  .cross-text-panel {
    animation: none !important;
    transition: none !important;
  }
}

/* ============================================================
   Launch polish — 品牌 chrome、狀態頁、mobile header、motion
   ============================================================ */
::selection { background: rgba(184,89,64,.18); color: var(--color-ink); }

.skip-link {
  position: fixed;
  left: 14px;
  top: 10px;
  z-index: 1000;
  transform: translateY(-150%);
  padding: 9px 13px;
  border-radius: 999px;
  background: var(--color-accent-strong);
  color: #fff;
  font-size: 12px;
  font-weight: 800;
  transition: transform .16s ease;
}
.skip-link:focus { transform: translateY(0); }

.brand { align-items: center; gap: 10px; min-width: 0; }
.brand-mark-image {
  display: block;
  width: 36px;
  height: 36px;
  flex: 0 0 36px;
  border-radius: 12px;
  box-shadow: 0 7px 18px rgba(13,56,50,.14);
}
.brand-copy-group { display: flex; flex-direction: column; min-width: 0; line-height: 1; }
.brand-word { font-family: var(--font-display); font-size: 18px; font-weight: 760; letter-spacing: -.035em; }
.brand-tagline { margin-top: 4px; color: var(--color-ink-faint); font-family: var(--font-data); font-size: 7px; font-weight: 850; letter-spacing: .18em; }
.header-crumb:empty { display: none; }
.header-nav-link {
  position: relative;
  transition: background .16s ease, color .16s ease, transform .16s ease;
}
.header-nav-link[aria-current="page"] {
  background: rgba(23,73,64,.09);
  color: var(--color-accent-strong);
}
.header-nav-link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 3px;
  width: 12px;
  height: 2px;
  transform: translateX(-50%);
  border-radius: 999px;
  background: var(--color-reader-orange);
}

.loading-state.launch-loading {
  min-height: min(52vh, 420px);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 48px 20px;
  text-align: left;
  color: var(--color-ink);
}
.launch-loading > div { display: grid; gap: 4px; }
.launch-loading strong { font-family: var(--font-display); font-size: 18px; font-weight: 720; letter-spacing: -.025em; }
.launch-loading small { color: var(--color-ink-faint); font-size: 11px; }
.loading-mark {
  position: relative;
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  flex: 0 0 46px;
  border-radius: 15px;
  background: var(--color-accent);
  color: #fff;
  font-family: var(--font-display);
  font-weight: 800;
  box-shadow: 0 14px 30px rgba(23,73,64,.15);
}
.loading-mark::after {
  content: "";
  position: absolute;
  inset: -6px;
  border: 1px solid rgba(23,73,64,.16);
  border-top-color: var(--color-reader-orange);
  border-radius: 19px;
  animation: launch-spin 1.4s linear infinite;
}
@keyframes launch-spin { to { transform: rotate(360deg); } }

.launch-state {
  position: relative;
  overflow: hidden;
  max-width: 720px;
  margin: 54px auto 0;
  padding: clamp(30px, 6vw, 54px);
  border: 1px solid rgba(23,73,64,.12);
  border-radius: 30px;
  background:
    radial-gradient(circle at 92% 10%, rgba(184,89,64,.10), transparent 28%),
    linear-gradient(145deg, rgba(255,255,255,.92), rgba(246,242,232,.78));
  box-shadow: 0 28px 70px rgba(31,48,43,.08);
}
.launch-state::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(rgba(23,73,64,.025) 1px, transparent 1px), linear-gradient(90deg, rgba(23,73,64,.025) 1px, transparent 1px);
  background-size: 28px 28px;
  mask-image: linear-gradient(to bottom, #000, transparent 72%);
}
.launch-state > * { position: relative; z-index: 1; }
.launch-state-kicker { margin: 0 0 10px; color: var(--color-reader-orange); font-family: var(--font-data); font-size: 9px; font-weight: 900; letter-spacing: .18em; }
.launch-state .page-title { max-width: 560px; margin-bottom: 14px; font-size: clamp(32px, 6vw, 48px); letter-spacing: -.055em; }
.launch-state-copy { max-width: 590px; margin: 0; color: var(--color-ink-soft); font-size: 14px; line-height: 1.8; }
.launch-state-help { margin: 14px 0 0; color: var(--color-ink-faint); font-size: 11px; line-height: 1.7; }
.launch-state-actions { display: flex; gap: 9px; flex-wrap: wrap; margin-top: 26px; }
.launch-state-mark {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  margin-bottom: 22px;
  border-radius: 16px;
  background: var(--color-error-soft);
  color: var(--color-error);
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 800;
}
.launch-state-code {
  margin-bottom: 18px;
  color: rgba(23,73,64,.11);
  font-family: var(--font-display);
  font-size: clamp(66px, 14vw, 112px);
  font-weight: 800;
  line-height: .8;
  letter-spacing: -.08em;
}

.empty-state {
  border: 1px dashed rgba(23,73,64,.16);
  border-radius: 20px;
  background: rgba(255,255,255,.5);
}
.noscript-state {
  max-width: 720px;
  margin: 24px auto;
  padding: 16px 18px;
  border-radius: 14px;
  background: #fff4e8;
  color: #6f4b2c;
  font-size: 13px;
}

:where(a, button, input, textarea, select, [tabindex]):focus-visible {
  outline: 3px solid rgba(184,89,64,.36);
  outline-offset: 3px;
}

@media (max-width: 680px) {
  #app-header { background: rgba(250,248,243,.92); }
  .header-inner { padding: 9px 14px 8px; gap: 8px; flex-wrap: wrap; }
  .brand { flex: 1 1 auto; gap: 8px; }
  .brand-mark-image { width: 32px; height: 32px; flex-basis: 32px; border-radius: 10px; }
  .brand-word { font-size: 17px; }
  .brand-tagline { display: none; }
  .header-nav { flex: 0 0 auto; gap: 3px; }
  .header-nav-link { min-height: 36px; padding: 0 11px; border-radius: 999px; font-size: 11px; }
  .header-crumb { order: 3; flex: 1 0 100%; max-width: none; padding: 3px 2px 0 40px; font-size: 10px; }
  .launch-state { margin-top: 28px; padding: 28px 22px; border-radius: 24px; }
  .launch-state .page-title { font-size: clamp(30px, 10vw, 40px); }
  .launch-state-actions .btn { flex: 1 1 150px; }
  .loading-state.launch-loading { min-height: 46vh; padding-inline: 10px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto !important; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}