:root {
  --bg: #FAF0E6;
  --bg-2: #F3E9DD;
  --surface: #FFFCF7;
  --surface-2: #F5EBE0;
  --border: #E4D5C3;
  --text: #2C2420;
  --text-dim: #7A6A5C;
  --accent: #B5651D;
  --accent-2: #8B5E3C;
  --accent-3: #C97B4A;
  --gradient: linear-gradient(135deg, #B5651D 0%, #8B5E3C 50%, #C97B4A 100%);
  --radius: 14px;
  --radius-sm: 8px;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --mono: 'JetBrains Mono', monospace;
}


* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}


/* ===== 系列首页：三本书 ===== */

.series-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 40px;
}

.series-card {
  display: flex;
  flex-direction: column;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
  overflow: hidden;
  transition: all 0.3s;
}

.series-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 16px 40px rgba(44, 36, 32, 0.12);
}

.series-card-featured {
  border-color: var(--accent);
  box-shadow: 0 8px 30px rgba(181, 101, 29, 0.15);
}

.series-cover {
  position: relative;
  height: 180px;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
}

.series-cover-mark {
  font-size: 44px;
  color: #ffffff;
}

.series-cover-badge {
  position: absolute;
  top: 12px;
  right: 12px;
  padding: 4px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.9);
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.03em;
}

.series-body {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 24px;
  flex: 1;
}

.series-status {
  margin-bottom: 4px;
}

.series-title {
  font-size: 19px;
  font-weight: 700;
  line-height: 1.3;
}

.series-sub {
  font-size: 14px;
  color: var(--text-dim);
  line-height: 1.55;
  flex: 1;
}

.series-actions {
  margin-top: 8px;
}

/* ===== 为什么是这个系列 ===== */

.why-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 40px;
}

.why-card {
  padding: 32px;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
  transition: all 0.3s;
}

.why-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
}

.why-icon {
  font-size: 32px;
  margin-bottom: 16px;
}

.why-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 12px;
}

.why-card p {
  font-size: 15px;
  color: var(--text-dim);
  line-height: 1.65;
}

.why-card code {
  font-family: var(--mono);
  font-size: 13px;
  background: var(--surface-2);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--accent);
}

/* 背景粒子画布 */
#bg-canvas {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  z-index: -1;
  opacity: 0.7;
}

/* 导航 */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  background: rgba(250, 240, 230, 0.85);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
  font-size: 18px;
}

.logo-mark {
  color: var(--accent);
  font-size: 20px;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.accent { color: var(--accent); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-links a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: color 0.2s;
}

.nav-links a:hover { color: var(--text); }

.nav-cta {
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 700 !important;
}

/* Hero */
.hero {
  min-height: auto;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  align-items: center;
  gap: 60px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 120px 24px 80px;
}

.badge {
  display: inline-block;
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 13px;
  color: var(--text-dim);
  margin-bottom: 24px;
  background: var(--surface);
}

.hero-title {
  font-size: clamp(32px, 3.5vw, 60px);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}

.gradient-text {
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 18px;
  color: var(--text-dim);
  max-width: 560px;
  margin-bottom: 36px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 15px;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: all 0.2s;
  font-family: var(--font);
}

.btn-primary {
  background: var(--gradient);
  color: #ffffff;
  box-shadow: 0 6px 20px rgba(181, 101, 29, 0.25);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(181, 101, 29, 0.35);
}

.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.btn-full { width: 100%; }

.hero-stats {
  display: flex;
  gap: 40px;
}

.stat { display: flex; flex-direction: column; }

.stat-num {
  font-size: 28px;
  font-weight: 800;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat-label {
  font-size: 13px;
  color: var(--text-dim);
}

/* Hero 矩阵动画 */
.hero-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

.matrix-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 8px;
  width: 100%;
  max-width: 360px;
}

.matrix-cell {
  aspect-ratio: 1;
  border-radius: 6px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  transition: all 0.3s;
}
/*
.matrix-cell.active {
  background: var(--gradient);
  border-color: transparent;
  box-shadow: 0 0 16px rgba(181, 101, 29, 0.25);
}
*/
.matrix-cell.active {
  background: linear-gradient(135deg, #E8A04B 0%, #D97B2E 50%, #C96A1F 100%);
  border-color: transparent;
  box-shadow: 0 0 20px rgba(217, 123, 46, 0.45);
}


/* Section 通用 */
.section { padding: 100px 0; }
.section-dark { background: var(--bg-2); }

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section-title {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.section-sub {
  color: var(--text-dim);
  font-size: 17px;
  margin-bottom: 48px;
  max-width: 640px;
}

/* 目标读者 */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 40px;
}

.card {
  padding: 32px;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
}

.card h3 {
  font-size: 18px;
  margin-bottom: 20px;
  font-weight: 700;
}

.card ul { list-style: none; }

.card li {
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
  color: var(--text-dim);
  font-size: 15px;
}

.card li:last-child { border-bottom: none; }

.card-yes { border-color: rgba(0, 229, 255, 0.3); }
.card-no { border-color: rgba(255, 45, 149, 0.2); }

/* 目录 */
.toc-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 40px;
}

.toc-item {
  display: flex;
  gap: 20px;
  padding: 24px;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
  transition: all 0.3s;
}

.toc-item:hover {
  border-color: var(--accent);
  transform: translateX(4px);
}

.toc-num {
  font-family: var(--mono);
  font-size: 14px;
  color: var(--accent);
  font-weight: 700;
}

.toc-item h4 {
  font-size: 16px;
  margin-bottom: 4px;
}

.toc-item p {
  font-size: 14px;
  color: var(--text-dim);
}

.toc-item code {
  font-family: var(--mono);
  font-size: 13px;
  background: var(--surface-2);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--accent);
}

/* 免费试读 */
.sample-box {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  padding: 60px;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

.sample-box::before {
  content: '';
  position: absolute;
  top: -50%; right: -50%;
  width: 100%; height: 100%;
  background: radial-gradient(circle, rgba(124, 92, 255, 0.15), transparent 70%);
  pointer-events: none;
}

.sample-text h2 {
  font-size: 32px;
  margin-bottom: 16px;
  font-weight: 800;
}

.sample-text p {
  color: var(--text-dim);
  margin-bottom: 28px;
}

.subscribe-form {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.subscribe-form input {
  flex: 1;
  min-width: 220px;
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  font-family: var(--font);
  outline: none;
  transition: border-color 0.2s;
}

.subscribe-form input:focus {
  border-color: var(--accent);
}

.form-note {
  margin-top: 14px;
  font-size: 14px;
  color: var(--accent);
  min-height: 20px;
}

.code-card {
  border-radius: var(--radius);
  background: var(--surface-2);
  border: 1px solid var(--border);
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(44, 36, 32, 0.08);
}

.code-header {
  display: flex;
  gap: 8px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  background: var(--surface-2);
}

.code-header span {
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--border);
}

.code-header span:nth-child(1) { background: #ff5f57; }
.code-header span:nth-child(2) { background: #febc2e; }
.code-header span:nth-child(3) { background: #28c840; }

.code-card pre {
  padding: 24px;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-dim);
  overflow-x: auto;
}

.code-card code { color: var(--accent); }

/* 用户评价 */
.testimonial-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 40px;
}

.testimonial {
  padding: 28px;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
  transition: all 0.3s;
}

.testimonial:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
}

.testimonial-content {
  font-size: 15px;
  color: var(--text);
  margin-bottom: 20px;
  line-height: 1.7;
}

.testimonial-author {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.testimonial-author strong {
  font-size: 14px;
  color: var(--text);
}

.testimonial-author span {
  font-size: 13px;
  color: var(--text-dim);
}

/* 购买 */
.buy-box {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 60px;
  align-items: center;
  padding: 60px;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

.buy-box::before {
  content: '';
  position: absolute;
  top: -30%; left: -30%;
  width: 80%; height: 80%;
  background: radial-gradient(circle, rgba(0, 229, 255, 0.12), transparent 70%);
  pointer-events: none;
}

.buy-info h2 {
  font-size: 32px;
  font-weight: 800;
  margin-bottom: 12px;
}

.buy-sub {
  color: var(--text-dim);
  margin-bottom: 28px;
  font-size: 16px;
}

.buy-features {
  list-style: none;
}

.buy-features li {
  padding: 10px 0;
  color: var(--text-dim);
  font-size: 15px;
  border-bottom: 1px solid var(--border);
}

.buy-features li:last-child { border-bottom: none; }

.buy-card {
  padding: 32px;
  border-radius: var(--radius);
  background: var(--bg);
  border: 1px solid var(--border);
  text-align: center;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
}

.price-tag {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 12px;
  margin-bottom: 8px;
}

.price-launch {
  font-size: 48px;
  font-weight: 800;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.price-original {
  font-size: 20px;
  color: var(--text-dim);
  text-decoration: line-through;
}

.price-note {
  font-size: 14px;
  color: var(--accent);
  margin-bottom: 24px;
}

.buy-guarantee {
  margin-top: 16px;
  font-size: 13px;
  color: var(--text-dim);
}

/* 作者 */
.author-box {
  display: flex;
  gap: 40px;
  align-items: center;
  padding: 60px;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
}

.author-avatar {
  flex-shrink: 0;
  width: 100px;
  height: 100px;
  border-radius: 50%;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 40px;
  color: #ffffff;
  font-weight: 800;
}

.author-text h2 {
  font-size: 28px;
  font-weight: 800;
  margin-bottom: 16px;
}

.author-text p {
  color: var(--text-dim);
  margin-bottom: 12px;
  font-size: 16px;
}

.author-text strong { color: var(--text); }

/* 页脚 */
.footer {
  padding: 60px 0 40px;
  border-top: 1px solid var(--border);
  background: var(--bg-2);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  text-align: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
}

.footer-links {
  display: flex;
  gap: 28px;
}

.footer-links a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.2s;
}

.footer-links a:hover { color: var(--accent); }

.footer-copy {
  font-size: 13px;
  color: var(--text-dim);
}

/* More from Matrix Intuition */
.book-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 40px;
}

.book-card {
  display: flex;
  gap: 24px;
  padding: 28px;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
  transition: all 0.3s;
}

.book-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
}

.book-card-soon {
  opacity: 0.75;
}

.book-card-soon:hover {
  opacity: 1;
}

.book-cover {
  flex-shrink: 0;
  width: 80px;
  height: 110px;
  border-radius: 8px;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 10px 30px rgba(0, 229, 255, 0.2);
}

.book-cover-mark {
  font-size: 28px;
  color: #ffffff;
}

.book-body {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.book-status {
  margin-bottom: 4px;
}

.badge-live,
.badge-soon {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
}

.badge-live {
  background: rgba(0, 229, 255, 0.12);
  color: var(--accent);
  border: 1px solid rgba(0, 229, 255, 0.3);
}

.badge-soon {
  background: rgba(124, 92, 255, 0.12);
  color: var(--accent-2);
  border: 1px solid rgba(124, 92, 255, 0.3);
}

.book-title {
  font-size: 18px;
  font-weight: 700;
  line-height: 1.3;
}

.book-sub {
  font-size: 14px;
  color: var(--text-dim);
  line-height: 1.5;
  margin-bottom: 8px;
}

.btn-sm {
  padding: 8px 16px;
  font-size: 14px;
  align-self: flex-start;
}

/* Coming Soon 购买卡片 */
.buy-card-soon {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.soon-label {
  display: inline-block;
  align-self: center;
  padding: 6px 18px;
  border-radius: 999px;
  background: rgba(124, 92, 255, 0.12);
  border: 1px solid rgba(124, 92, 255, 0.4);
  color: var(--accent-2);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.soon-desc {
  text-align: center;
  color: var(--text-dim);
  font-size: 14px;
  line-height: 1.6;
}

.soon-desc strong {
  color: var(--accent);
}

/* ===== /books 系列页 ===== */

.page-header {
  padding: 140px 0 60px;
  background: var(--bg-2);
  border-bottom: 1px solid var(--border);
}

.page-title {
  font-size: clamp(34px, 5vw, 56px);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin: 20px 0 16px;
}

.page-sub {
  color: var(--text-dim);
  font-size: 17px;
  max-width: 640px;
  line-height: 1.7;
}

.page-stats {
  margin-top: 36px;
}

/* 书列表 */
.books-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.book-row {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 32px;
  padding: 32px;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
  transition: all 0.3s;
  align-items: center;
}

.book-row:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
}

.book-row-soon {
  opacity: 0.85;
}

.book-row-soon:hover {
  opacity: 1;
}

/* 封面 */
.book-row-cover {
  position: relative;
  /*width: 140px; 原先图片太小，同时修改上面：grid-template-columns: 140px 1fr;
  height: 190px;*/
  width: 240px;
  height: 340px;
  border-radius: 10px;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 16px 40px rgba(0, 229, 255, 0.2);
}

.book-cover-mark {
  font-size: 40px;
  color: #ffffff;
}

.book-cover-badge {
  position: absolute;
  top: 10px;
  right: 10px;
  padding: 3px 9px;
  border-radius: 999px;
  background: rgba(5, 6, 10, 0.75);
  color: var(--accent);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

/* 内容 */
.book-row-body {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.book-status {
  margin-bottom: 2px;
}

.book-row-title {
  font-size: 24px;
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.01em;
}

.book-row-sub {
  color: var(--text-dim);
  font-size: 15px;
  line-height: 1.6;
  max-width: 640px;
}

.book-row-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 8px;
}

.book-row-price {
  font-size: 15px;
  font-weight: 700;
  color: var(--accent);
}

/* 空状态 */
.empty-state {
  text-align: center;
  color: var(--text-dim);
  padding: 60px 0;
}

/* 底部 CTA */
.cta-box {
  text-align: center;
  max-width: 640px;
  margin: 0 auto;
}

.cta-box h2 {
  font-size: clamp(26px, 3.5vw, 36px);
  font-weight: 800;
  margin-bottom: 16px;
}

.cta-box p {
  color: var(--text-dim);
  font-size: 16px;
  line-height: 1.7;
  margin-bottom: 28px;
}

.cta-box strong {
  color: var(--text);
}

.cta-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ===== Blog ===== */

.post-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.post-card {
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
  transition: all 0.3s;
  overflow: hidden;
}

.post-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.post-card:hover .post-thumb img {
  transform: scale(1.04);
}

/* 文章卡片：左图右文 */
.post-link {
  display: flex;
  align-items: stretch;
  gap: 20px;
  padding: 20px;
  text-decoration: none;
  color: inherit;
}

/* 缩略图 */
.post-thumb {
  flex-shrink: 0;
  width: 200px;
  min-height: 150px;
  overflow: hidden;
  /*border-radius: var(--radius) 0 0 var(--radius);*/
  border-radius: 10px;
  background: var(--surface-2);
}

.post-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.3s ease;
}

/* 文字区 */
.post-body {
  flex: 1;
  /*padding: 24px 28px;*/
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  min-width: 0;
}

.post-date {
  font-size: 13px;
  color: var(--accent);
  font-family: var(--mono);
  letter-spacing: 0.02em;
}

.post-title {
  font-size: 22px;
  font-weight: 700;
  margin: 8px 0 8px;
  line-height: 1.3;
}

.post-desc {
  color: var(--text-dim);
  font-size: 15px;
  line-height: 1.6;
}

.post-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 14px;
}

.post-tag {
  padding: 3px 10px;
  border-radius: 999px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  font-size: 12px;
  color: var(--text-dim);
}

/* 单篇文章页 */
.post-page {
  padding: 120px 0 80px;
}

.post-container {
  max-width: 1200px;
}

.back-link {
  display: inline-block;
  color: var(--text-dim);
  text-decoration: none;
  font-size: 14px;
  margin-bottom: 32px;
  transition: color 0.2s;
}

.back-link:hover {
  color: var(--accent);
}

.post-header {
  margin-bottom: 40px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--border);
}

.post-title-lg {
  font-size: clamp(30px, 4.5vw, 46px);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 12px 0 16px;
}

.post-lead {
  font-size: 18px;
  color: var(--text-dim);
  line-height: 1.7;
}

/* 正文排版 */
.post-content {
  font-size: 17px;
  line-height: 1.85;
  color: var(--text);
}

.post-content h2 {
  font-size: 26px;
  font-weight: 700;
  margin: 48px 0 16px;
  color: var(--text);
}

.post-content h3 {
  font-size: 20px;
  font-weight: 700;
  margin: 36px 0 12px;
  color: var(--text);
}

.post-content p {
  margin-bottom: 20px;
}

.post-content a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.post-content ul,
.post-content ol {
  margin: 0 0 20px 24px;
}

.post-content li {
  margin-bottom: 8px;
}

.post-content code {
  font-family: var(--mono);
  font-size: 0.9em;
  background: var(--surface-2);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--accent);
}

.post-content pre {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 20px;
  overflow-x: auto;
  margin-bottom: 24px;
}

.post-content pre code {
  background: none;
  padding: 0;
  color: var(--text);
  font-size: 14px;
}

.post-content blockquote {
  border-left: 3px solid var(--accent);
  padding-left: 20px;
  margin: 24px 0;
  color: var(--text-dim);
  font-style: italic;
}

.post-content table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 24px;
}

.post-content th,
.post-content td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  text-align: left;
  font-size: 15px;
}

.post-content th {
  color: var(--accent);
  font-weight: 600;
}

/* 文章页脚 */
.post-footer {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
  color: var(--text-dim);
  font-size: 15px;
  line-height: 1.7;
}

.post-footer a {
  color: var(--accent);
}

/* 相关文章 */
.related-posts {
  margin-top: 64px;
}

.related-posts h3 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 20px;
}

.book-cover-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 10px;
  display: block;
}

@media (max-width: 900px) {
  .post-page {
    padding: 90px 0 60px;
  }
}


/* 响应式 */
@media (max-width: 900px) {
  .book-row {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .book-row-cover {
    margin: 0 auto;
  }

  .book-row-actions {
    justify-content: center;
  }
}

/* 响应式 */
@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
    text-align: center;
    padding-top: 100px;
  }

  .hero-subtitle { margin-left: auto; margin-right: auto; }
  .hero-actions { justify-content: center; }
  .hero-stats { justify-content: center; }
  .hero-visual { display: none; }

  .two-col,
  .toc-grid,
  .testimonial-grid,
  .sample-box,
  .buy-box {
    grid-template-columns: 1fr;
  }

  .sample-box,
  .buy-box,
  .author-box {
    padding: 32px;
  }

  .author-box {
    flex-direction: column;
    text-align: center;
  }

  .nav-links { display: none; }

  .section { padding: 60px 0; }

   .book-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 900px) {
  .post-thumb {
    display: none;
  }

  .post-link {
    padding: 24px;
    gap: 0;
  }

  .post-body {
    padding: 0;
  }
}

/* 响应式 */
@media (max-width: 900px) {
  .series-grid,
  .why-grid {
    grid-template-columns: 1fr;
  }

  .series-cover {
    height: 140px;
  }
}


/* ===== 评论 ===== */

.comment-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin: 32px 0;
}

.comment {
  padding: 20px 24px;
  border-radius: var(--radius-sm);
  background: var(--surface);
  border: 1px solid var(--border);
}

.comment-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
}

.comment-head strong {
  font-size: 14px;
  color: var(--text);
}

.comment-head time {
  font-size: 12px;
  color: var(--text-dim);
  font-family: var(--mono);
}

.comment-body {
  font-size: 15px;
  color: var(--text-dim);
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
}

/* 提交表单 */
.comment-form {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 24px;
  max-width: 640px;
}

.comment-form input,
.comment-form textarea {
  width: 100%;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  font-family: var(--font);
  outline: none;
  transition: border-color 0.2s;
}

.comment-form textarea {
  min-height: 100px;
  resize: vertical;
}

.comment-form input:focus,
.comment-form textarea:focus {
  border-color: var(--accent);
}

.comment-form button {
  align-self: flex-start;
}

.hero-svg {
  width: 100%;
  max-width: 560px;
  height: auto;
  display: block;
  border-radius: var(--radius);
  box-shadow: 0 16px 48px rgba(44, 36, 32, 0.15);
}

/* 让右侧整体更宽一点，容纳图和字 */
.hero-visual-stacked {
  display: flex;
  flex-direction: column;
  gap: 24px;
  max-width: 540px; /* 控制一下最大宽度，避免太宽 */
}

.hero-svg-wrap {
  width: 100%;
}

.hero-svg {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius);
  box-shadow: 0 16px 48px rgba(44, 36, 32, 0.15);
}

/* 解说文字的样式 */
.hero-svg-caption {
  padding: 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 8px 24px rgba(44, 36, 32, 0.05);
}

.hero-svg-caption h4 {
  font-size: 15px;
  font-weight: 800;
  color: var(--accent);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.hero-svg-caption p {
  font-size: 14px;
  color: var(--text-dim);
  line-height: 1.6;
  margin: 0;
}

.hero-svg-caption code,
 .hero-subtitle code{
  font-family: var(--mono);
  font-size: 13px;
  color: var(--accent);
  background: var(--surface-2);
  padding: 2px 4px;
  border-radius: 4px;
}

.hero-svg-caption strong {
  color: var(--text);
}

/* ===== 回到顶部按钮 ===== */
.back-to-top {
  position: fixed;
  bottom: 40px;
  right: 40px;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--surface);
  color: var(--accent);
  border: 1px solid var(--border);
  box-shadow: 0 10px 30px rgba(44, 36, 32, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all 0.3s ease;
}

/* 当添加了 .show 类时显示 */
.back-to-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* 鼠标悬浮效果 */
.back-to-top:hover {
  background: var(--gradient);
  color: #ffffff;
  border-color: transparent;
  transform: translateY(-4px);
  box-shadow: 0 15px 35px rgba(181, 101, 29, 0.25);
}

/* 手机端调整位置，避免挡住内容 */
@media (max-width: 900px) {
  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 44px;
    height: 44px;
  }
}

/* ===== FAQ 折叠面板 ===== */
.faq-section {
  max-width: 800px;
  margin: 0 auto;
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 32px;
}

.faq-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: all 0.3s;
}

/* 问题标题区域 */
.faq-item summary {
  padding: 20px 24px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  list-style: none; /* 隐藏默认的三角箭头 */
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* 自定义右侧的 + 号 */
.faq-item summary::after {
  content: "+";
  font-size: 20px;
  color: var(--accent);
  font-weight: 400;
  transition: transform 0.3s;
}

/* 展开时的样式 */
.faq-item[open] {
  border-color: var(--accent);
  box-shadow: 0 8px 24px rgba(44, 36, 32, 0.08);
}

.faq-item[open] summary::after {
  transform: rotate(45deg); /* + 号旋转成 x */
}

/* 隐藏浏览器默认的小三角 (针对 Safari) */
.faq-item summary::-webkit-details-marker {
  display: none;
}

/* 答案内容区域 */
.faq-content {
  padding: 0 24px 20px;
  color: var(--text-dim);
  line-height: 1.7;
  font-size: 15px;
}

.author-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover; /* 保证图片完美填充圆形，不拉伸变形 */
  border-radius: 50%; /* 让图片自身也是圆形 */
}