/* ========================================
   心有山海 - 在线阅读器样式 v3.0
   高级视觉效果版本
   ======================================== */

/* --- CSS Variables --- */
:root {
  --color-bg: #0f0f0f;
  --color-surface: #1a1a1a;
  --color-surface-alt: #222222;
  --color-text: #f5f0e6;
  --color-text-muted: #9a8a7a;
  --color-gold: #c9a962;
  --color-gold-light: #e0c878;
  --color-gold-dark: #a08040;
  --color-border: rgba(201, 169, 98, 0.2);
  --color-border-light: rgba(201, 169, 98, 0.1);
  --font-heading: "Noto Serif SC", serif;
  --font-body: "Noto Serif SC", serif;
  --font-calligraphy: "Ma Shan Zheng", cursive;
  --font-size-base: 18px;
  --line-height-base: 2;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-gold: 0 4px 20px rgba(201, 169, 98, 0.2);
  --shadow-gold-lg: 0 8px 40px rgba(201, 169, 98, 0.3);
  --shadow-glow: 0 0 40px rgba(201, 169, 98, 0.1);
  --transition-fast: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 亮色主题 */
.theme-light {
  --color-bg: #f8f4ed;
  --color-surface: #ffffff;
  --color-surface-alt: #f5f0e6;
  --color-text: #1a1a1a;
  --color-text-muted: #666;
  --color-border: rgba(0, 0, 0, 0.1);
  --color-border-light: rgba(0, 0, 0, 0.05);
}

/* 护眼主题 */
.theme-sepia {
  --color-bg: #f4ecd8;
  --color-surface: #faf5e6;
  --color-surface-alt: #f0e8d0;
  --color-text: #3d3d3d;
  --color-text-muted: #5a5a5a;
  --color-border: rgba(139, 115, 85, 0.25);
  --color-border-light: rgba(139, 115, 85, 0.1);
}

/* --- Base --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: var(--font-size-base);
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: var(--line-height-base);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* 噪点纹理 */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image:
    radial-gradient(circle at 20% 30%, rgba(201, 169, 98, 0.03) 0%, transparent 40%),
    radial-gradient(circle at 80% 70%, rgba(201, 169, 98, 0.02) 0%, transparent 40%);
  pointer-events: none;
  z-index: 0;
}

body::after {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 400 400' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
  opacity: 0.02;
  pointer-events: none;
  z-index: 0;
}

/* --- Page System --- */
.page {
  display: none;
  min-height: 100vh;
}

.page.active {
  display: block;
  animation: pageIn 0.5s ease;
}

@keyframes pageIn {
  from {
    opacity: 0;
    transform: translateX(20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* --- Cover Page --- */
.cover-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.cover-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 30% 20%, rgba(201, 169, 98, 0.05) 0%, transparent 50%),
    radial-gradient(ellipse at 70% 80%, rgba(201, 169, 98, 0.03) 0%, transparent 50%);
}

/* 双层装饰边框 */
.cover-bg::before {
  content: '';
  position: absolute;
  inset: 50px;
  border: 1px solid rgba(201, 169, 98, 0.12);
}

.cover-bg::after {
  content: '';
  position: absolute;
  inset: 100px;
  border: 1px solid rgba(201, 169, 98, 0.06);
}

/* 旋转装饰圆环 */
.cover-decoration {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 500px;
  height: 500px;
  border: 1px solid rgba(201, 169, 98, 0.04);
  border-radius: 50%;
  animation: rotate 80s linear infinite;
  pointer-events: none;
}

@keyframes rotate {
  from { transform: translate(-50%, -50%) rotate(0deg); }
  to { transform: translate(-50%, -50%) rotate(360deg); }
}

.cover-decoration::before {
  content: '';
  position: absolute;
  inset: 40px;
  border: 1px solid rgba(201, 169, 98, 0.06);
  border-radius: 50%;
  animation: rotate 60s linear infinite reverse;
}

.cover-decoration::after {
  content: '';
  position: absolute;
  inset: 80px;
  border: 1px solid rgba(201, 169, 98, 0.03);
  border-radius: 50%;
  animation: rotate 100s linear infinite;
}

.cover-content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 48px;
}

.cover-badge {
  display: inline-block;
  font-size: 0.75rem;
  color: var(--color-gold);
  letter-spacing: 0.4em;
  margin-bottom: 28px;
  padding: 10px 28px;
  border: 1px solid var(--color-gold);
  position: relative;
  overflow: hidden;
}

/* 徽章光泽扫过 */
.cover-badge::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(201, 169, 98, 0.2), transparent);
  animation: shimmer 3s infinite;
}

@keyframes shimmer {
  0% { left: -100%; }
  100% { left: 100%; }
}

.cover-title {
  font-family: var(--font-calligraphy);
  font-size: 6rem;
  color: var(--color-gold);
  letter-spacing: 0.35em;
  margin-bottom: 20px;
  text-shadow: 0 0 80px rgba(201, 169, 98, 0.3);
  animation: fadeInUp 1s ease-out;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(40px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 768px) {
  .cover-title { font-size: 3.5rem; letter-spacing: 0.2em; }
  .cover-bg::before { inset: 30px; }
  .cover-bg::after { inset: 60px; }
  .cover-decoration { width: 300px; height: 300px; }
}

.cover-subtitle {
  font-size: 1.35rem;
  color: var(--color-text);
  margin-bottom: 28px;
  letter-spacing: 0.1em;
  animation: fadeInUp 1s ease-out 0.2s backwards;
}

.cover-divider {
  width: 120px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-gold), transparent);
  margin: 40px auto;
  position: relative;
  animation: fadeInUp 1s ease-out 0.4s backwards;
}

.cover-divider::before {
  content: '◆';
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  color: var(--color-gold);
  font-size: 0.625rem;
  background: var(--color-bg);
  padding: 0 16px;
}

.cover-desc {
  font-size: 1rem;
  color: var(--color-text-muted);
  margin-bottom: 48px;
  line-height: 2.2;
  animation: fadeInUp 1s ease-out 0.6s backwards;
}

.cover-btn {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  padding: 18px 48px;
  background: linear-gradient(135deg, var(--color-gold) 0%, var(--color-gold-dark) 100%);
  color: #1a1a1a;
  border: none;
  font-family: var(--font-heading);
  font-size: 1.0625rem;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: var(--transition-base);
  position: relative;
  overflow: hidden;
  animation: fadeInUp 1s ease-out 0.8s backwards;
}

.cover-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
  transition: 0.5s;
}

.cover-btn:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-gold-lg);
}

.cover-btn:hover::before {
  left: 100%;
}

.cover-quote {
  margin-top: 56px;
  font-family: var(--font-calligraphy);
  font-size: 1.125rem;
  color: var(--color-gold);
  opacity: 0.85;
  animation: fadeInUp 1s ease-out 1s backwards;
}

/* --- TOC Page --- */
.toc-page {
  background: var(--color-bg);
}

.toc-header {
  position: sticky;
  top: 0;
  background: rgba(15, 15, 15, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: 24px;
  display: flex;
  align-items: center;
  gap: 20px;
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
}

.toc-back {
  background: none;
  border: 1px solid var(--color-border);
  color: var(--color-gold);
  cursor: pointer;
  padding: 10px;
  border-radius: 4px;
  transition: var(--transition-base);
}

.toc-back:hover {
  background: rgba(201, 169, 98, 0.1);
  border-color: var(--color-gold);
}

.toc-header h2 {
  font-family: var(--font-calligraphy);
  font-size: 1.75rem;
  color: var(--color-gold);
  letter-spacing: 0.1em;
}

.toc-content {
  padding: 32px 24px;
  max-width: 640px;
  margin: 0 auto;
}

.toc-section {
  margin-bottom: 8px;
}

.toc-section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 0;
  cursor: pointer;
  border-bottom: 1px solid var(--color-border-light);
  transition: var(--transition-base);
}

.toc-section-header:hover {
  background: rgba(201, 169, 98, 0.03);
  padding-left: 8px;
}

.toc-section-title {
  font-size: 1rem;
  color: var(--color-text);
  letter-spacing: 0.05em;
}

.toc-section-count {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  background: rgba(201, 169, 98, 0.1);
  padding: 4px 10px;
  border-radius: 10px;
}

.toc-items {
  display: none;
  padding-left: 20px;
}

.toc-section.expanded .toc-items {
  display: block;
  animation: slideDown 0.3s ease;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.toc-item {
  display: flex;
  align-items: center;
  padding: 14px 0;
  border-bottom: 1px solid rgba(201, 169, 98, 0.08);
  cursor: pointer;
  transition: var(--transition-base);
}

.toc-item:hover {
  background: rgba(201, 169, 98, 0.05);
  padding-left: 12px;
}

.toc-item-num {
  font-size: 0.8125rem;
  color: var(--color-gold);
  width: 70px;
  flex-shrink: 0;
  font-weight: 500;
}

.toc-item-title {
  flex: 1;
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  transition: var(--transition-base);
}

.toc-item:hover .toc-item-title {
  color: var(--color-text);
}

.toc-item svg {
  color: var(--color-text-muted);
  opacity: 0.4;
  transition: var(--transition-base);
}

.toc-item:hover svg {
  opacity: 0.8;
  color: var(--color-gold);
}

/* --- Reader Page --- */
.reader-page {
  background: var(--color-bg);
}

.reader-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 60px;
  background: rgba(15, 15, 15, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
}

.reader-back, .reader-settings {
  background: none;
  border: 1px solid var(--color-border);
  color: var(--color-gold);
  cursor: pointer;
  padding: 10px;
  border-radius: 4px;
  transition: var(--transition-base);
}

.reader-back:hover, .reader-settings:hover {
  background: rgba(201, 169, 98, 0.1);
  border-color: var(--color-gold);
}

.reader-title {
  font-family: var(--font-calligraphy);
  font-size: 1.25rem;
  color: var(--color-gold);
  text-align: center;
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  padding: 0 20px;
  letter-spacing: 0.05em;
}

/* --- Reader Content --- */
.reader-content {
  max-width: 720px;
  margin: 0 auto;
  padding: 150px 28px 110px;
  font-size: 1rem;
  line-height: var(--line-height-base);
  position: relative;
  z-index: 1;
}

/* 章节标题装饰 */
.reader-content h1 {
  font-family: var(--font-calligraphy);
  font-size: 2.5rem;
  color: var(--color-gold);
  text-align: center;
  margin-bottom: 20px;
  letter-spacing: 0.2em;
  text-shadow: 0 0 60px rgba(201, 169, 98, 0.3);
  position: relative;
  padding-bottom: 20px;
}

.reader-content h1::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-gold), transparent);
}

.reader-content .chapter-subtitle {
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.9375rem;
  margin-bottom: 40px;
  letter-spacing: 0.05em;
}

.reader-content .chapter-divider {
  width: 100px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-gold), transparent);
  margin: 40px auto;
  position: relative;
}

.reader-content .chapter-divider::before {
  content: '◆';
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  color: var(--color-gold);
  font-size: 0.5rem;
  background: var(--color-bg);
  padding: 0 12px;
}

.reader-content .chapter-quote {
  background: linear-gradient(135deg, rgba(201, 169, 98, 0.08) 0%, rgba(201, 169, 98, 0.04) 100%);
  border-left: 3px solid var(--color-gold);
  padding: 24px 28px;
  margin: 40px 0;
  font-style: italic;
  color: var(--color-text);
  position: relative;
  border-radius: 0 8px 8px 0;
}

.reader-content .chapter-quote::before {
  content: '"';
  position: absolute;
  top: -8px;
  left: 20px;
  font-size: 3rem;
  color: var(--color-gold);
  opacity: 0.25;
  font-family: serif;
}

.reader-content h2 {
  font-family: var(--font-calligraphy);
  font-size: 1.625rem;
  color: var(--color-gold);
  margin: 56px 0 28px;
  position: relative;
  padding-left: 24px;
}

.reader-content h2::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 28px;
  background: linear-gradient(180deg, var(--color-gold-dark), var(--color-gold));
  border-radius: 2px;
}

.reader-content h3 {
  font-size: 1.125rem;
  color: var(--color-text);
  margin: 36px 0 20px;
}

.reader-content p {
  margin-bottom: 1.75em;
  text-align: justify;
  color: var(--color-text);
}

.reader-content strong {
  color: var(--color-gold);
}

.reader-content ul, .reader-content ol {
  margin: 1.75em 0;
  padding-left: 2em;
}

.reader-content li {
  margin-bottom: 0.875em;
  color: var(--color-text);
}

.reader-content li::marker {
  color: var(--color-gold);
}

/* --- Reader Navigation --- */
.reader-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(15, 15, 15, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  border-top: 1px solid var(--color-border);
}

.reader-nav-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  background: none;
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  cursor: pointer;
  padding: 10px 18px;
  font-size: 0.875rem;
  border-radius: 4px;
  transition: var(--transition-base);
}

.reader-nav-btn:hover {
  color: var(--color-gold);
  border-color: var(--color-gold);
  background: rgba(201, 169, 98, 0.05);
}

.reader-nav-btn.toc-btn {
  background: rgba(201, 169, 98, 0.1);
  border-color: var(--color-gold);
  color: var(--color-gold);
}

.reader-nav-btn.toc-btn:hover {
  background: rgba(201, 169, 98, 0.2);
}

/* --- Settings Panel --- */
.settings-panel {
  position: fixed;
  top: 0;
  right: -320px;
  width: 320px;
  height: 100vh;
  background: rgba(20, 20, 20, 0.98);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-left: 1px solid var(--color-border);
  z-index: 200;
  transition: right 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: -10px 0 40px rgba(0, 0, 0, 0.4);
}

.settings-panel.open {
  right: 0;
}

.settings-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px;
  border-bottom: 1px solid var(--color-border);
}

.settings-header h3 {
  font-family: var(--font-calligraphy);
  color: var(--color-gold);
  font-size: 1.25rem;
  letter-spacing: 0.05em;
}

.settings-header button {
  background: none;
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: 1rem;
  cursor: pointer;
  width: 36px;
  height: 36px;
  border-radius: 4px;
  transition: var(--transition-base);
}

.settings-header button:hover {
  background: rgba(201, 169, 98, 0.1);
  border-color: var(--color-gold);
  color: var(--color-gold);
}

.settings-content {
  padding: 24px;
}

.setting-group {
  margin-bottom: 28px;
}

.setting-group label {
  display: block;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: 14px;
  letter-spacing: 0.05em;
}

.font-size-options,
.theme-options,
.line-height-options {
  display: flex;
  gap: 10px;
}

.font-size-options button,
.theme-options button,
.line-height-options button {
  flex: 1;
  padding: 12px;
  background: rgba(201, 169, 98, 0.08);
  border: 1px solid transparent;
  color: var(--color-text);
  cursor: pointer;
  font-size: 0.875rem;
  border-radius: 4px;
  transition: var(--transition-base);
}

.font-size-options button:hover,
.theme-options button:hover,
.line-height-options button:hover {
  background: rgba(201, 169, 98, 0.15);
}

.font-size-options button.active,
.theme-options button.active,
.line-height-options button.active {
  border-color: var(--color-gold);
  color: var(--color-gold);
  background: rgba(201, 169, 98, 0.15);
}

/* --- Font Size Variants --- */
.font-small { --font-size-base: 16px; }
.font-medium { --font-size-base: 18px; }
.font-large { --font-size-base: 21px; }

/* --- Line Height Variants --- */
.line-compact { --line-height-base: 1.75; }
.line-normal { --line-height-base: 2; }
.line-loose { --line-height-base: 2.4; }

/* --- Media Section --- */
.media-section {
  background: var(--color-surface);
  border-radius: 12px;
  padding: 24px;
  margin-bottom: 36px;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.media-tabs {
  display: flex;
  gap: 12px;
  margin-bottom: 20px;
}

.media-tab {
  flex: 1;
  padding: 14px 20px;
  background: rgba(201, 169, 98, 0.08);
  border: 1px solid transparent;
  color: var(--color-text);
  cursor: pointer;
  font-size: 0.9375rem;
  border-radius: 8px;
  transition: var(--transition-base);
  font-family: var(--font-body);
}

.media-tab:hover {
  background: rgba(201, 169, 98, 0.15);
}

.media-tab.active {
  border-color: var(--color-gold);
  color: var(--color-gold);
  background: rgba(201, 169, 98, 0.12);
}

.media-content {
  margin-top: 20px;
}

.audio-container,
.video-container {
  background: rgba(0, 0, 0, 0.25);
  border-radius: 10px;
  padding: 20px;
}

.audio-container audio,
.video-container video {
  border-radius: 8px;
  width: 100%;
}

.media-note {
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.875rem;
  margin-top: 14px;
  margin-bottom: 0;
}

.download-section {
  display: flex;
  gap: 12px;
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--color-border-light);
}

.download-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 20px;
  background: rgba(201, 169, 98, 0.1);
  border: 1px solid var(--color-gold);
  color: var(--color-gold);
  text-decoration: none;
  border-radius: 8px;
  font-size: 0.9375rem;
  transition: var(--transition-base);
  font-family: var(--font-body);
  position: relative;
  overflow: hidden;
}

.download-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(201, 169, 98, 0.2), transparent);
  transition: 0.5s;
}

.download-btn:hover {
  background: rgba(201, 169, 98, 0.2);
  transform: translateY(-2px);
  box-shadow: var(--shadow-gold);
}

.download-btn:hover::before {
  left: 100%;
}

/* --- Home Link --- */
.home-link {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--color-gold);
  text-decoration: none;
  font-size: 0.9375rem;
  padding: 14px 20px;
  background: rgba(201, 169, 98, 0.08);
  border-radius: 8px;
  transition: var(--transition-base);
  border: 1px solid transparent;
}

.home-link:hover {
  background: rgba(201, 169, 98, 0.15);
  border-color: var(--color-gold);
}

/* --- User Status --- */
#userStatus {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 100;
}

.user-info {
  display: flex;
  align-items: center;
  gap: 12px;
  background: rgba(25, 25, 25, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: 10px 18px;
  border-radius: 28px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: var(--transition-base);
}

.user-info:hover {
  border-color: rgba(255, 255, 255, 0.2);
}

.user-info.vip {
  border-color: var(--color-gold);
  background: rgba(201, 169, 98, 0.1);
  box-shadow: var(--shadow-glow);
}

.user-avatar {
  font-size: 1.375rem;
}

.user-name {
  color: #fff;
  font-size: 0.9375rem;
}

.user-badge {
  padding: 3px 10px;
  border-radius: 12px;
  font-size: 0.75rem;
  font-weight: 500;
}

.user-badge.guest {
  background: rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.7);
}

.user-badge.member {
  background: rgba(74, 222, 128, 0.2);
  color: #4ade80;
}

.user-badge.vip {
  background: linear-gradient(135deg, var(--color-gold), #a88a4a);
  color: #1a1a1a;
}

.logout-btn {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: rgba(255, 255, 255, 0.6);
  padding: 5px 14px;
  border-radius: 14px;
  font-size: 0.8125rem;
  cursor: pointer;
  transition: var(--transition-base);
}

.logout-btn:hover {
  border-color: #ef4444;
  color: #ef4444;
}

.login-link {
  display: block;
  background: linear-gradient(135deg, var(--color-gold), #a88a4a);
  color: #1a1a1a;
  text-decoration: none;
  padding: 10px 24px;
  border-radius: 24px;
  font-size: 0.9375rem;
  font-weight: 500;
  transition: var(--transition-base);
  box-shadow: var(--shadow-gold);
}

.login-link:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-gold-lg);
}

/* --- Locked Content --- */
.locked-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 48px;
  background: linear-gradient(135deg, rgba(0, 0, 0, 0.3) 0%, rgba(0, 0, 0, 0.2) 100%);
  border-radius: 12px;
  border: 1px dashed var(--color-border);
}

.locked-content .lock-icon {
  font-size: 3.5rem;
  margin-bottom: 20px;
  opacity: 0.6;
}

.locked-content p {
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 24px;
  text-align: center;
}

.upgrade-btn {
  background: linear-gradient(135deg, var(--color-gold), #a88a4a);
  color: #1a1a1a;
  border: none;
  padding: 14px 36px;
  border-radius: 28px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-base);
  box-shadow: var(--shadow-gold);
}

.upgrade-btn:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-gold-lg);
}

.upgrade-btn.small {
  padding: 10px 20px;
  font-size: 0.9375rem;
}

/* --- Locked Download --- */
.download-section.locked {
  padding: 0;
}

.locked-download {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  padding: 20px;
  background: rgba(0, 0, 0, 0.2);
  border-radius: 8px;
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.9375rem;
  border: 1px dashed var(--color-border);
}

.locked-download .lock-icon {
  font-size: 1.125rem;
}

/* --- Upgrade Modal --- */
.upgrade-modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.upgrade-modal-content {
  background: linear-gradient(145deg, #1e1e1e, #252525);
  border: 1px solid var(--color-gold);
  border-radius: 16px;
  padding: 40px;
  text-align: center;
  max-width: 380px;
  box-shadow: var(--shadow-lg), var(--shadow-gold-lg);
  animation: modalIn 0.3s ease;
}

@keyframes modalIn {
  from {
    opacity: 0;
    transform: scale(0.9) translateY(20px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

.upgrade-modal-content h3 {
  color: var(--color-gold);
  font-size: 1.625rem;
  margin-bottom: 20px;
  font-family: var(--font-calligraphy);
}

.upgrade-modal-content p {
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 14px;
  line-height: 1.8;
}

.upgrade-hint {
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.875rem;
}

.upgrade-actions {
  display: flex;
  gap: 14px;
  margin-top: 28px;
}

.btn-upgrade {
  flex: 1;
  background: linear-gradient(135deg, var(--color-gold), #a88a4a);
  color: #1a1a1a;
  border: none;
  padding: 14px;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-base);
}

.btn-upgrade:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-gold);
}

.btn-cancel {
  flex: 1;
  background: transparent;
  color: rgba(255, 255, 255, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.2);
  padding: 14px;
  border-radius: 8px;
  font-size: 1rem;
  cursor: pointer;
  transition: var(--transition-base);
}

.btn-cancel:hover {
  border-color: rgba(255, 255, 255, 0.4);
  color: #fff;
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .reader-content {
    padding: 150px 20px 110px;
  }

  .cover-content {
    padding: 32px 20px;
  }

  .toc-content {
    padding: 24px 16px;
  }

  .settings-panel {
    width: 100%;
    right: -100%;
  }

  .user-info {
    padding: 8px 14px;
  }

  .user-name {
    display: none;
  }
}

/* --- Smooth Scrollbar --- */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg);
}

::-webkit-scrollbar-thumb {
  background: rgba(201, 169, 98, 0.3);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(201, 169, 98, 0.5);
}

/* --- Selection --- */
::selection {
  background: rgba(201, 169, 98, 0.3);
  color: var(--color-text);
}