/* ===== Poker Therapy — 設計系統 ===== */
/* 配色：溫暖治療室風 — 與 Mental Game 的冷色技術風形成對照 */

:root {
  /* 底色 — 羊皮紙/舊書 */
  --bg-primary: #F5EDD9;
  --bg-secondary: #EFE5CD;
  --bg-elevated: #FAF4E4;
  --bg-darker: #E8DBBE;

  /* 主色 — 深森林綠 (心理治療、智慧) */
  --green-deep: #1F3A2E;
  --green-mid: #2D5A48;
  --green-soft: #5B8A77;

  /* 暖色 — 赭石/琥珀 (溫度、燈光) */
  --amber: #C9A04E;
  --amber-deep: #8E6D2E;
  --terracotta: #B85C3F;
  --terracotta-soft: #D78A6B;

  /* 警示 — 誤觸發 (Misfire) */
  --misfire: #A93926;
  --misfire-soft: #D87560;

  /* 重接 — Rewire (好的解讀) */
  --rewire: #3E7C5A;
  --rewire-soft: #7AAE92;

  /* 文字 */
  --ink: #2A2520;
  --ink-soft: #5A4F40;
  --ink-muted: #8A7E6A;
  --paper: #FAF6EA;

  /* 邊線 */
  --border: #C8B898;
  --border-soft: #DCD0B0;

  /* 字型 */
  --font-serif: "Noto Serif TC", "Noto Serif SC", "Source Han Serif", Georgia, serif;
  --font-sans: "Noto Sans TC", "Noto Sans SC", -apple-system, "Helvetica Neue", sans-serif;
  --font-display: "Cormorant Garamond", "Noto Serif TC", "Source Han Serif", serif;

  /* 陰影 */
  --shadow-sm: 0 1px 2px rgba(42, 37, 32, 0.08);
  --shadow-md: 0 4px 12px rgba(42, 37, 32, 0.10);
  --shadow-lg: 0 8px 28px rgba(42, 37, 32, 0.14);
  --shadow-paper: 0 2px 0 rgba(200, 184, 152, 0.4), 0 6px 16px rgba(42, 37, 32, 0.08);

  /* 圓角 */
  --r-sm: 4px;
  --r-md: 8px;
  --r-lg: 14px;
  --r-xl: 22px;
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink);
  background: var(--bg-primary);
  background-image:
    radial-gradient(circle at 15% 10%, rgba(201, 160, 78, 0.08), transparent 50%),
    radial-gradient(circle at 85% 80%, rgba(184, 92, 63, 0.06), transparent 50%),
    repeating-linear-gradient(
      45deg,
      transparent 0,
      transparent 2px,
      rgba(168, 140, 90, 0.018) 2px,
      rgba(168, 140, 90, 0.018) 3px
    );
  min-height: 100vh;
}

img { max-width: 100%; display: block; }
a { color: var(--green-mid); text-decoration: none; transition: all 0.2s ease; }
a:hover { color: var(--terracotta); }

/* ===== 排版 ===== */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--green-deep);
  letter-spacing: -0.01em;
  line-height: 1.25;
}

h1 { font-size: clamp(2.2rem, 5vw, 3.6rem); }
h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); margin-top: 3rem; }
h3 { font-size: clamp(1.2rem, 2vw, 1.5rem); margin-top: 2rem; color: var(--green-mid); }
h4 { font-size: 1.1rem; color: var(--amber-deep); }

p { margin: 1rem 0; color: var(--ink); }

blockquote {
  margin: 1.5rem 0;
  padding: 1rem 1.5rem;
  border-left: 4px solid var(--amber);
  background: var(--bg-elevated);
  font-style: italic;
  color: var(--ink-soft);
  border-radius: 0 var(--r-md) var(--r-md) 0;
}

code, .mono {
  font-family: "SF Mono", "JetBrains Mono", Menlo, monospace;
  font-size: 0.9em;
  background: var(--bg-darker);
  padding: 0.1em 0.4em;
  border-radius: var(--r-sm);
}

/* ===== Layout ===== */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
}
.container-narrow {
  max-width: 780px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ===== Header / Nav ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(245, 237, 217, 0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-soft);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  max-width: 1100px;
  margin: 0 auto;
  gap: 1rem;
}
.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-display);
  font-size: 1.05rem;
  color: var(--green-deep);
  font-weight: 600;
}
.nav-brand-mark {
  width: 32px; height: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--green-deep), var(--green-mid));
  display: grid;
  place-items: center;
  color: var(--amber);
  font-weight: 700;
  font-size: 0.95rem;
  box-shadow: var(--shadow-sm);
}
.nav-links {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  flex-wrap: wrap;
}
.nav-link {
  padding: 0.4rem 0.8rem;
  font-size: 0.92rem;
  color: var(--ink-soft);
  border-radius: var(--r-md);
}
.nav-link:hover, .nav-link.active {
  color: var(--green-deep);
  background: var(--bg-darker);
}

/* 語言切換 */
.lang-toggle {
  display: inline-flex;
  border: 1px solid var(--border);
  border-radius: 999px;
  overflow: hidden;
  background: var(--bg-elevated);
  font-size: 0.85rem;
  font-family: var(--font-sans);
}
.lang-toggle button {
  border: 0;
  padding: 0.35rem 0.85rem;
  background: transparent;
  cursor: pointer;
  color: var(--ink-muted);
  font-weight: 500;
  transition: all 0.2s;
  font-family: inherit;
}
.lang-toggle button.active {
  background: var(--green-deep);
  color: var(--amber);
}
.lang-toggle button:not(.active):hover {
  color: var(--green-mid);
}

/* ===== Hero ===== */
.hero {
  padding: 4rem 0 3rem;
  text-align: center;
  position: relative;
}
.hero-eyebrow {
  display: inline-block;
  padding: 0.3rem 1rem;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--amber-deep);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 999px;
  margin-bottom: 1.5rem;
}
.hero-title {
  margin: 0 0 1rem;
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.02em;
}
.hero-subtitle {
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  color: var(--ink-soft);
  max-width: 640px;
  margin: 0 auto 2rem;
  font-weight: 400;
  line-height: 1.55;
}
.hero-meta {
  display: flex;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
  font-size: 0.9rem;
  color: var(--ink-muted);
  font-family: var(--font-serif);
}
.hero-meta span strong {
  color: var(--green-mid);
  font-weight: 600;
}

/* ===== Card 系統 ===== */
.card {
  background: var(--paper);
  border: 1px solid var(--border-soft);
  border-radius: var(--r-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-paper);
  transition: transform 0.25s, box-shadow 0.25s;
}
.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
  margin: 2rem 0;
}

.chapter-card {
  display: block;
  background: var(--paper);
  border: 1px solid var(--border-soft);
  border-radius: var(--r-lg);
  padding: 1.75rem;
  text-decoration: none;
  color: inherit;
  position: relative;
  overflow: hidden;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: var(--shadow-sm);
}
.chapter-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 60%, rgba(201, 160, 78, 0.06));
  pointer-events: none;
}
.chapter-card:hover {
  transform: translateY(-4px);
  border-color: var(--amber);
  box-shadow: var(--shadow-lg);
}
.chapter-num {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  color: var(--amber-deep);
  text-transform: uppercase;
  font-weight: 600;
  margin-bottom: 0.5rem;
}
.chapter-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--green-deep);
  margin: 0 0 0.75rem;
  line-height: 1.3;
}
.chapter-desc {
  color: var(--ink-soft);
  font-size: 0.95rem;
  line-height: 1.6;
  margin: 0;
}
.chapter-tags {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
  margin-top: 1rem;
}
.tag {
  font-size: 0.72rem;
  padding: 0.2rem 0.6rem;
  background: var(--bg-darker);
  color: var(--ink-soft);
  border-radius: 999px;
  font-weight: 500;
}

/* ===== Concept Box (重要概念) ===== */
.concept {
  margin: 2rem 0;
  padding: 1.5rem 1.75rem;
  background: linear-gradient(135deg, var(--bg-elevated), var(--paper));
  border: 1px solid var(--border-soft);
  border-left: 5px solid var(--amber);
  border-radius: var(--r-md);
  position: relative;
}
.concept-label {
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--amber-deep);
  margin-bottom: 0.5rem;
}
.concept-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  margin: 0 0 0.5rem;
  color: var(--green-deep);
}
.concept p:last-child { margin-bottom: 0; }

/* 警示版本 */
.concept.warn { border-left-color: var(--misfire); }
.concept.warn .concept-label { color: var(--misfire); }

/* 修復版本 */
.concept.fix { border-left-color: var(--rewire); }
.concept.fix .concept-label { color: var(--rewire); }

/* ===== Rewire Diagram (核心視覺) ===== */
.rewire-diagram {
  margin: 2.5rem 0;
  padding: 1.75rem;
  background: var(--bg-elevated);
  border-radius: var(--r-lg);
  border: 1px dashed var(--border);
}
.rewire-diagram-title {
  text-align: center;
  font-family: var(--font-display);
  font-size: 1.05rem;
  color: var(--ink-soft);
  margin: 0 0 1.5rem;
  letter-spacing: 0.05em;
}

.flow {
  display: grid;
  gap: 0.5rem;
  align-items: stretch;
}
@media (min-width: 700px) {
  .flow.three { grid-template-columns: 1fr auto 1fr auto 1fr; align-items: center; }
}
.flow-box {
  padding: 1rem 1.2rem;
  border-radius: var(--r-md);
  text-align: center;
  font-size: 0.92rem;
  line-height: 1.5;
  border: 2px solid;
}
.flow-box .label {
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-weight: 700;
  display: block;
  margin-bottom: 0.4rem;
  opacity: 0.8;
}
.flow-box.trigger {
  background: var(--bg-darker);
  border-color: var(--ink-muted);
  color: var(--ink);
}
.flow-box.bad {
  background: rgba(169, 57, 38, 0.1);
  border-color: var(--misfire);
  color: var(--misfire);
}
.flow-box.action-bad {
  background: rgba(184, 92, 63, 0.1);
  border-color: var(--terracotta);
  color: var(--terracotta);
}
.flow-box.good {
  background: rgba(62, 124, 90, 0.1);
  border-color: var(--rewire);
  color: var(--rewire);
}
.flow-box.action-good {
  background: rgba(91, 138, 119, 0.12);
  border-color: var(--green-mid);
  color: var(--green-deep);
}
.flow-arrow {
  display: grid;
  place-items: center;
  color: var(--ink-muted);
  font-size: 1.4rem;
  padding: 0 0.4rem;
}
.flow-arrow.down { transform: rotate(90deg); }
@media (min-width: 700px) {
  .flow-arrow.down { transform: none; }
}

.rewire-pair {
  display: grid;
  gap: 1.5rem;
  margin-top: 1.5rem;
}
@media (min-width: 800px) {
  .rewire-pair { grid-template-columns: 1fr 1fr; gap: 2rem; }
}
.rewire-side {
  padding: 1.25rem;
  border-radius: var(--r-md);
}
.rewire-side.before {
  background: rgba(169, 57, 38, 0.05);
  border: 1px solid rgba(169, 57, 38, 0.3);
}
.rewire-side.after {
  background: rgba(62, 124, 90, 0.05);
  border: 1px solid rgba(62, 124, 90, 0.3);
}
.rewire-side h4 {
  margin-top: 0;
  font-size: 0.8rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
.rewire-side.before h4 { color: var(--misfire); }
.rewire-side.after h4 { color: var(--rewire); }

/* ===== Sections ===== */
section { padding: 2rem 0; }
.section-eyebrow {
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--amber-deep);
  margin-bottom: 0.5rem;
}

/* ===== Lists ===== */
.styled-list {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0;
}
.styled-list li {
  padding: 0.6rem 0 0.6rem 2rem;
  position: relative;
  border-bottom: 1px dashed var(--border-soft);
}
.styled-list li:last-child { border-bottom: 0; }
.styled-list li::before {
  content: '◆';
  position: absolute;
  left: 0.5rem;
  top: 0.6rem;
  color: var(--amber);
  font-size: 0.85rem;
}

/* 步驟列表 */
.step-list {
  counter-reset: step;
  list-style: none;
  padding: 0;
}
.step-list li {
  counter-increment: step;
  padding: 1rem 1rem 1rem 3.5rem;
  position: relative;
  margin-bottom: 0.75rem;
  background: var(--paper);
  border: 1px solid var(--border-soft);
  border-radius: var(--r-md);
}
.step-list li::before {
  content: counter(step);
  position: absolute;
  left: 1rem;
  top: 1rem;
  width: 1.8rem; height: 1.8rem;
  background: var(--green-deep);
  color: var(--amber);
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-weight: 700;
  font-family: var(--font-display);
}

/* ===== Quote / Callout ===== */
.callout-quote {
  margin: 2rem 0;
  padding: 1.75rem 2rem;
  background: linear-gradient(135deg, var(--green-deep), var(--green-mid));
  color: var(--paper);
  border-radius: var(--r-lg);
  position: relative;
  font-family: var(--font-display);
  font-size: 1.2rem;
  line-height: 1.5;
}
.callout-quote::before {
  content: '"';
  position: absolute;
  left: 1rem; top: -0.5rem;
  font-size: 5rem;
  color: var(--amber);
  opacity: 0.5;
  font-family: Georgia, serif;
}
.callout-quote cite {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-style: normal;
  margin-top: 0.75rem;
  color: var(--amber);
  letter-spacing: 0.05em;
}

/* ===== Footer ===== */
.site-footer {
  margin-top: 5rem;
  padding: 3rem 0 2rem;
  background: var(--green-deep);
  color: var(--bg-secondary);
}
.site-footer .container {
  display: grid;
  gap: 2rem;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}
.site-footer h4 {
  color: var(--amber);
  font-size: 0.85rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  margin: 0 0 0.75rem;
}
.site-footer a {
  color: var(--bg-secondary);
  display: block;
  padding: 0.2rem 0;
  font-size: 0.92rem;
  opacity: 0.85;
}
.site-footer a:hover { color: var(--amber); opacity: 1; }
.footer-attribution {
  border-top: 1px solid rgba(245, 237, 217, 0.15);
  margin-top: 2rem;
  padding-top: 1.5rem;
  text-align: center;
  font-size: 0.85rem;
  opacity: 0.75;
  grid-column: 1 / -1;
}
.footer-attribution strong { color: var(--amber); }

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--r-md);
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  transition: all 0.2s;
}
.btn-primary {
  background: var(--green-deep);
  color: var(--amber);
}
.btn-primary:hover {
  background: var(--green-mid);
  color: var(--paper);
  transform: translateY(-1px);
}
.btn-outline {
  border-color: var(--border);
  color: var(--green-deep);
  background: transparent;
}
.btn-outline:hover {
  background: var(--bg-elevated);
  border-color: var(--amber);
}

/* Chapter navigation */
.chapter-nav {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin: 4rem 0 2rem;
  padding: 1.5rem 0;
  border-top: 1px solid var(--border-soft);
  border-bottom: 1px solid var(--border-soft);
  flex-wrap: wrap;
}
.chapter-nav a {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: var(--ink-soft);
  flex: 1;
  min-width: 140px;
  padding: 0.75rem;
  border-radius: var(--r-md);
  transition: background 0.2s;
}
.chapter-nav a:hover { background: var(--bg-elevated); color: var(--green-deep); }
.chapter-nav a small {
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-muted);
}
.chapter-nav a strong {
  font-family: var(--font-display);
  font-size: 1.1rem;
  color: var(--green-deep);
  margin-top: 0.2rem;
}
.chapter-nav .next { text-align: right; align-items: flex-end; }

/* ===== TOC Panel ===== */
.toc-panel {
  background: var(--paper);
  border: 1px solid var(--border-soft);
  border-radius: var(--r-lg);
  padding: 1.5rem;
  margin: 2rem 0;
}
.toc-panel h3 {
  margin-top: 0;
  font-size: 0.85rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--amber-deep);
}
.toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
  counter-reset: toc;
}
.toc-list li {
  counter-increment: toc;
  padding: 0.4rem 0;
  border-bottom: 1px dashed var(--border-soft);
}
.toc-list li:last-child { border: 0; }
.toc-list a {
  display: flex;
  gap: 0.75rem;
  align-items: baseline;
  color: var(--ink);
}
.toc-list a::before {
  content: counter(toc, decimal-leading-zero);
  color: var(--amber-deep);
  font-family: var(--font-display);
  font-weight: 600;
  min-width: 2rem;
}
.toc-list a:hover { color: var(--terracotta); }

/* ===== Flashcards ===== */
.flashcard-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
  margin: 2rem 0;
}
.flashcard {
  perspective: 1000px;
  height: 220px;
  cursor: pointer;
}
.flashcard-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  transform-style: preserve-3d;
}
.flashcard.flipped .flashcard-inner { transform: rotateY(180deg); }
.flashcard-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: var(--r-lg);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-paper);
}
.flashcard-front {
  background: linear-gradient(135deg, var(--paper), var(--bg-elevated));
  text-align: center;
}
.flashcard-back {
  background: linear-gradient(135deg, var(--green-deep), var(--green-mid));
  color: var(--paper);
  transform: rotateY(180deg);
  font-size: 0.92rem;
  line-height: 1.6;
  overflow-y: auto;
}
.flashcard-back strong { color: var(--amber); }
.flashcard-back p, .flashcard-back small { color: var(--paper); }
.flashcard-cat {
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--amber-deep);
  font-weight: 700;
  margin-bottom: 0.5rem;
}
.flashcard-q {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--green-deep);
  line-height: 1.3;
  margin: 0;
}
.flashcard-hint {
  margin-top: 0.75rem;
  font-size: 0.75rem;
  color: var(--ink-muted);
  letter-spacing: 0.05em;
}
.flashcard-controls {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin: 2rem 0 1rem;
  flex-wrap: wrap;
}
.filter-pill {
  padding: 0.4rem 1rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--paper);
  color: var(--ink-soft);
  cursor: pointer;
  font-size: 0.85rem;
  font-family: inherit;
  transition: all 0.2s;
}
.filter-pill.active {
  background: var(--green-deep);
  color: var(--amber);
  border-color: var(--green-deep);
}
.filter-pill:hover:not(.active) {
  border-color: var(--amber);
  color: var(--green-deep);
}

/* ===== Inline visual aids ===== */
.icon-bubble {
  display: inline-grid;
  place-items: center;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--bg-elevated);
  color: var(--green-deep);
  border: 2px solid var(--amber);
  margin-bottom: 0.75rem;
}

.attribution-banner {
  margin: 2rem 0;
  padding: 1rem 1.25rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border-soft);
  border-radius: var(--r-md);
  font-size: 0.9rem;
  color: var(--ink-soft);
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.attribution-banner strong { color: var(--green-deep); }

/* ===== Responsive ===== */
@media (max-width: 640px) {
  .nav { padding: 0.75rem 1rem; }
  .nav-links { gap: 0; }
  .nav-link { padding: 0.3rem 0.5rem; font-size: 0.85rem; }
  .hero { padding: 2.5rem 0 2rem; }
  h1 { font-size: 2rem; }
}

/* ===== Library 頁專用 ===== */
.library-hero {
  padding: 5rem 0 3rem;
  text-align: center;
  background:
    radial-gradient(circle at 30% 20%, rgba(201, 160, 78, 0.15), transparent 60%),
    radial-gradient(circle at 70% 70%, rgba(184, 92, 63, 0.10), transparent 60%);
}
.library-hero h1 {
  font-size: clamp(2.6rem, 6vw, 4.5rem);
  margin-bottom: 0.75rem;
}
.library-hero .tagline {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.15rem;
  color: var(--ink-soft);
}

.book-shelf {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  margin: 3rem 0;
}
.book-card {
  display: flex;
  flex-direction: column;
  background: var(--paper);
  border: 1px solid var(--border-soft);
  border-radius: var(--r-lg);
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: var(--shadow-paper);
}
.book-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.book-cover {
  height: 200px;
  display: grid;
  place-items: center;
  position: relative;
  overflow: hidden;
}
.book-cover.therapy {
  background: linear-gradient(135deg, #1F3A2E, #2D5A48);
}
.book-cover.mental-game {
  background: linear-gradient(135deg, #1A1A2E, #16213E);
}
.book-cover-title {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 600;
  color: var(--amber);
  text-align: center;
  padding: 0 1rem;
  z-index: 2;
  line-height: 1.2;
}
.book-cover-deco {
  position: absolute;
  font-size: 8rem;
  opacity: 0.08;
  font-family: serif;
  z-index: 1;
}
.book-info {
  padding: 1.5rem;
}
.book-info h3 {
  margin: 0 0 0.5rem;
  font-size: 1.25rem;
}
.book-info .author {
  font-size: 0.85rem;
  color: var(--ink-muted);
  margin-bottom: 0.75rem;
  font-family: var(--font-display);
  font-style: italic;
}
.book-info p {
  font-size: 0.92rem;
  color: var(--ink-soft);
  line-height: 1.55;
  margin: 0 0 1rem;
}
.book-meta {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 0.75rem;
}
.book-meta .tag.featured {
  background: var(--amber);
  color: var(--ink);
  font-weight: 700;
}
.book-action {
  font-size: 0.9rem;
  color: var(--green-mid);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.book-card:hover .book-action { color: var(--terracotta); }

/* "即將推出" 卡 */
.book-card.coming-soon {
  opacity: 0.7;
  cursor: not-allowed;
}
.book-card.coming-soon:hover { transform: none; }
.book-cover.coming { background: linear-gradient(135deg, #5A4F40, #8A7E6A); }

/* SVG diagrams */
.svg-figure {
  margin: 2rem auto;
  max-width: 100%;
  display: block;
}
.svg-figure-caption {
  text-align: center;
  font-style: italic;
  color: var(--ink-muted);
  font-size: 0.85rem;
  margin-top: 0.5rem;
}

/* 頂部進度條 */
.reading-progress {
  position: fixed;
  top: 0; left: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--amber), var(--terracotta));
  width: 0%;
  z-index: 1000;
  transition: width 0.1s;
}