:root {
  --bg: #f5f3ef;
  --surface: #ffffff;
  --surface-alt: #fcfbf9;
  --text: #2c241b;
  --muted: #857567;
  --line: #e3ddd7;
  --brand: #a47c5c;
  --brand-dark: #7a5a40;
  --soft-brand: #f9f4f0;
  --dark-panel: #261f1a;
  --dark-text: #f5f3ef;
  --shadow: 0 8px 30px rgba(100, 80, 60, 0.08);
  --radius: 28px;
  --content-max: 1360px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    linear-gradient(180deg, #fdfbf8 0%, #f5f3ef 180px, #f5f3ef 100%);
  color: var(--text);
  font-family: "SF Pro Display", "PingFang TC", "Microsoft JhengHei", "Noto Sans TC", sans-serif;
}

a {
  color: inherit;
  text-decoration: none;
}

.apple-page {
  width: min(var(--content-max), calc(100vw - 32px));
  margin: 0 auto;
  padding: 12px 0 56px;
}

.site-ribbon {
  position: sticky;
  top: 0;
  z-index: 20;
  margin-bottom: 16px;
  backdrop-filter: blur(14px);
}

.ribbon-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 52px;
  padding: 0 18px;
  border-radius: 18px;
  background: rgba(253, 252, 250, 0.88);
  border: 1px solid rgba(227, 221, 215, 0.75);
}

.ribbon-brand {
  font-size: 0.95rem;
  font-weight: 600;
}

.ribbon-meta {
  font-size: 0.9rem;
  color: var(--muted);
}

.hero-panel {
  margin-bottom: 18px;
  padding: 76px 32px 72px;
  border-radius: 34px;
  background:
    radial-gradient(circle at top center, rgba(164, 124, 92, 0.15), transparent 34%),
    linear-gradient(180deg, #ffffff 0%, #faf8f5 100%);
  text-align: center;
  box-shadow: var(--shadow);
}

.hero-kicker {
  margin: 0 0 14px;
  color: var(--brand);
  font-size: 1.05rem;
  font-weight: 600;
}

.hero-panel h1 {
  margin: 0;
  font-size: clamp(2.8rem, 6vw, 5.4rem);
  line-height: 1.04;
  letter-spacing: -0.05em;
}

.hero-subtitle {
  width: min(760px, 100%);
  margin: 18px auto 0;
  color: var(--muted);
  font-size: clamp(1.1rem, 2.4vw, 1.6rem);
  line-height: 1.5;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 28px;
}

.hero-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 148px;
  padding: 12px 20px;
  border-radius: 999px;
  font-size: 1rem;
  font-weight: 600;
}

.hero-button.primary {
  background: var(--brand);
  color: #fff;
}

.hero-button.primary:hover {
  background: var(--brand-dark);
}

.hero-button.secondary {
  background: #fff;
  color: var(--brand);
  border: 1px solid rgba(164, 124, 92, 0.25);
}

.chapter-strip {
  display: flex;
  gap: 12px;
  overflow-x: auto;
  padding: 6px 4px 18px;
  margin-bottom: 8px;
}

.chapter-chip {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(227, 221, 215, 0.8);
  box-shadow: var(--shadow);
}

.chapter-chip span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 999px;
  background: var(--soft-brand);
  color: var(--brand);
  font-size: 0.82rem;
  font-weight: 700;
}

.chapter-chip strong {
  white-space: nowrap;
  font-size: 0.95rem;
  font-weight: 600;
}

.panel-stack {
  display: grid;
  gap: 18px;
}

.chapter-panel {
  min-height: 560px;
  padding: 48px 48px 42px;
  border-radius: 34px;
  background: var(--surface);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.panel-0 {
  background:
    radial-gradient(circle at top right, rgba(164, 124, 92, 0.12), transparent 24%),
    linear-gradient(180deg, #ffffff 0%, #faf8f5 100%);
}

.panel-1 {
  background:
    radial-gradient(circle at top center, rgba(164, 124, 92, 0.08), transparent 22%),
    linear-gradient(180deg, #ffffff 0%, #fcfbf9 100%);
}

.panel-2 {
  background:
    linear-gradient(180deg, #3d3128 0%, #261f1a 100%);
  color: var(--dark-text);
}

.panel-2 .panel-kicker,
.panel-2 h2,
.panel-2 .panel-body h3 {
  color: #fff;
}

.panel-2 .panel-body,
.panel-2 .panel-body p,
.panel-2 .panel-body li,
.panel-2 .panel-body blockquote {
  color: rgba(255, 255, 255, 0.88);
}

.panel-2 .panel-body blockquote {
  background: rgba(255, 255, 255, 0.06);
  border-left-color: rgba(255, 255, 255, 0.22);
}

.panel-3 {
  background:
    linear-gradient(180deg, #ffffff 0%, #fcf9f5 100%);
}

.panel-header {
  margin-bottom: 24px;
  text-align: center;
}

.panel-kicker {
  margin: 0 0 10px;
  color: var(--brand);
  font-size: 1rem;
  font-weight: 600;
}

.panel-header h2 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.4rem);
  line-height: 1.08;
  letter-spacing: -0.04em;
}

.panel-body {
  width: min(900px, 100%);
  margin: 0 auto;
}

.panel-body > * {
  margin: 0;
}

.panel-body h2 {
  margin-top: 36px;
  font-size: 2rem;
  line-height: 1.15;
  letter-spacing: -0.03em;
}

.panel-body h3 {
  margin-top: 28px;
  color: var(--brand-dark);
  font-size: 1.35rem;
  line-height: 1.25;
}

.panel-body p,
.panel-body ul,
.panel-body ol,
.panel-body blockquote,
.panel-body pre,
.panel-body table,
.panel-body hr {
  margin-top: 18px;
}

.panel-body p,
.panel-body li {
  font-size: 1.08rem;
  line-height: 1.9;
}

.panel-body ul,
.panel-body ol {
  padding-left: 24px;
}

.panel-body li + li {
  margin-top: 8px;
}

.panel-body blockquote {
  padding: 18px 20px;
  border-left: 4px solid rgba(164, 124, 92, 0.3);
  border-radius: 18px;
  background: rgba(249, 246, 242, 0.86);
}

.panel-body code {
  padding: 2px 6px;
  border-radius: 8px;
  background: rgba(44, 36, 27, 0.06);
}

.panel-body pre {
  overflow-x: auto;
  padding: 18px 20px;
  border-radius: 20px;
  background: var(--dark-panel);
  color: #f5f3ef;
}

.panel-body pre code {
  padding: 0;
  background: transparent;
  color: inherit;
}

.panel-body table {
  width: 100%;
  border-collapse: collapse;
}

.panel-body th,
.panel-body td {
  padding: 12px 14px;
  border: 1px solid rgba(227, 221, 215, 0.7);
  text-align: left;
}

.panel-body hr {
  border: 0;
  border-top: 1px solid rgba(227, 221, 215, 0.7);
}

.panel-body img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: 16px;
  margin-top: 18px;
}

.panel-body figure {
  display: block;
  margin: 18px 0 0;
}

.panel-body figure img {
  margin-top: 0;
}

.panel-body figcaption {
  margin-top: 8px;
  text-align: center;
  font-size: 0.92rem;
  color: var(--muted);
  font-style: italic;
  line-height: 1.5;
}

.panel-body p:has(> img:only-child) {
  margin-top: 18px;
}

.panel-body p:has(> img:only-child) + p > em:only-child {
  display: block;
  margin-top: 6px;
  text-align: center;
  font-size: 0.92rem;
  color: var(--muted);
}

.page-footer {
  padding: 28px 12px 0;
  text-align: center;
  color: var(--muted);
  font-size: 0.95rem;
}

@media (max-width: 980px) {
  .apple-page {
    width: min(100vw - 24px, 100%);
    padding-top: 10px;
  }

  .ribbon-inner {
    padding: 0 14px;
  }

  .hero-panel,
  .chapter-panel {
    padding-left: 24px;
    padding-right: 24px;
  }

  .panel-body {
    width: 100%;
  }
}

@media (max-width: 720px) {
  .apple-page {
    width: calc(100vw - 16px);
    padding-bottom: 36px;
  }

  .site-ribbon {
    position: static;
  }

  .ribbon-inner {
    min-height: 46px;
    border-radius: 14px;
  }

  .hero-panel {
    padding: 54px 20px 48px;
    border-radius: 26px;
  }

  .chapter-strip {
    padding-bottom: 12px;
  }

  .chapter-panel {
    min-height: 0;
    padding: 34px 20px 30px;
    border-radius: 26px;
  }

  .panel-header h2 {
    font-size: 2rem;
  }

  .panel-body p,
  .panel-body li {
    font-size: 1rem;
  }
}

/* Language Toggles */
.lang-toggles {
  display: flex;
  background: rgba(227, 221, 215, 0.4);
  padding: 3px;
  border-radius: 8px;
  margin-left: auto;
}
.lang-btn {
  background: transparent;
  border: none;
  border-radius: 6px;
  padding: 4px 10px;
  font-size: 0.8rem;
  color: var(--muted);
  cursor: pointer;
  font-weight: 500;
  transition: all 0.2s;
}
.lang-btn:hover {
  color: var(--text);
}
.lang-btn.active {
  background: #fff;
  color: var(--text);
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

/* Bilingual Styles */
.en {
  position: relative;
  padding-right: 36px;
  color: #7a5a40;
  font-family: "Georgia", "Times New Roman", serif;
  margin-top: 4px !important;
}
.en p, .en li {
  font-family: inherit;
}
.panel-2 .en {
  color: rgba(255, 255, 255, 0.55);
}

/* Toggle Logic */
body.lang-zh-only .en {
  display: none !important;
}

body.lang-en-only .panel-body > p:not(.en),
body.lang-en-only .panel-body > ul:not(.en),
body.lang-en-only .panel-body > ol:not(.en),
body.lang-en-only .panel-body > blockquote:not(.en) {
  display: none !important;
}

/* TTS Button Styles */
.tts-btn {
  position: absolute;
  top: 0;
  right: 0;
  background: transparent;
  border: none;
  font-size: 1.1rem;
  color: var(--brand);
  opacity: 0.6;
  cursor: pointer;
  transition: all 0.2s ease;
  padding: 4px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.tts-btn:hover {
  opacity: 1;
  transform: scale(1.1);
  background: rgba(164, 124, 92, 0.1);
}
.tts-btn.playing {
  opacity: 1;
  color: var(--blue, #0071e3);
  animation: pulse 1.5s infinite;
}

@keyframes pulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.15); }
  100% { transform: scale(1); }
}

/* Locked Chapter Styles */
.chapter-chip.locked {
  opacity: 0.6;
  background: rgba(230, 230, 235, 0.82);
  border: 1px dashed rgba(210, 210, 215, 0.8);
  cursor: pointer;
}
.chapter-chip.locked span {
  background: transparent;
  font-size: 1.1rem;
}

/* Purchase CTA Panel */
.panel-buy {
  text-align: center;
  background: radial-gradient(circle at top center, rgba(164, 124, 92, 0.18), transparent 50%), linear-gradient(180deg, #fffaf1 0%, #ffffff 100%);
  border: 2px solid rgba(164, 124, 92, 0.2);
  padding: 64px 32px;
}
.panel-buy .panel-kicker {
  font-size: 1.2rem;
}
.panel-buy .buy-message {
  font-size: 1.15rem;
  color: var(--muted);
  max-width: 600px;
  margin: 24px auto 36px;
  line-height: 1.8;
}
.panel-buy .buy-btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 18px 42px;
  background: var(--brand);
  color: #fff;
  font-size: 1.25rem;
  font-weight: bold;
  border-radius: 999px;
  text-decoration: none;
  box-shadow: 0 12px 24px rgba(164, 124, 92, 0.25);
  transition: all 0.3s ease;
}
.panel-buy .buy-btn:hover {
  transform: translateY(-4px) scale(1.02);
  box-shadow: 0 16px 32px rgba(164, 124, 92, 0.35);
  background: var(--brand-dark);
}