/* ==========================================================
   TRẠM ĐỌC - CSS TYPOGRAPHY & CHẾ ĐỘ ĐỌC TRUYỆN THƯ GIÃN
   HỖ TRỢ ĐỌC NỘI DUNG TỪ FILE MARKDOWN (.MD)
   ========================================================== */

:root {
  /* Biến màu chủ đạo mặc định (Sepia / Vàng ấm) */
  --bg-primary: #f7f1e3;
  --bg-secondary: #eee5d0;
  --bg-header: rgba(247, 241, 227, 0.94);
  --text-primary: #403223;
  --text-secondary: #746452;
  --accent-color: #9c5c24;
  --border-color: #decfae;
  --quote-bg: #efe4ca;
  --card-bg: #fffbf2;
  --shadow-sm: 0 2px 8px rgba(90, 70, 45, 0.08);

  /* Phông chữ */
  --font-serif: "Lora", Georgia, Cambria, serif;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --current-font: var(--font-serif);
  --font-size: 19px;
  --line-height: 1.85;
}

/* Chế độ Sáng (Light) */
[data-theme="light"] {
  --bg-primary: #fcfcfc;
  --bg-secondary: #f0f2f5;
  --bg-header: rgba(252, 252, 252, 0.95);
  --text-primary: #212529;
  --text-secondary: #6c757d;
  --accent-color: #2b6cb0;
  --border-color: #e2e8f0;
  --quote-bg: #f8fafc;
  --card-bg: #ffffff;
  --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.05);
}

/* Chế độ Ban đêm (Dark) */
[data-theme="dark"] {
  --bg-primary: #18191c;
  --bg-secondary: #22242a;
  --bg-header: rgba(24, 25, 28, 0.95);
  --text-primary: #dedede;
  --text-secondary: #9aa0a6;
  --accent-color: #e2a03f;
  --border-color: #31353e;
  --quote-bg: #212329;
  --card-bg: #1f2026;
  --shadow-sm: 0 4px 16px rgba(0, 0, 0, 0.35);
}

/* Áp dụng phông chữ */
[data-font="sans"] {
  --current-font: var(--font-sans);
}
[data-font="serif"] {
  --current-font: var(--font-serif);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  transition: background-color 0.25s ease, color 0.25s ease, border-color 0.25s ease;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--current-font);
  font-size: var(--font-size);
  line-height: var(--line-height);
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Thanh tiến độ đọc trên đỉnh màn hình */
.read-progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: var(--accent-color);
  z-index: 1001;
  transition: width 0.1s ease;
}

/* ==========================================================
   HEADER & THANH ĐIỀU KHIỂN
   ========================================================== */
.reader-header {
  position: sticky;
  top: 0;
  background: var(--bg-header);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  padding: 10px 20px;
}

.header-inner {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.site-title {
  text-decoration: none;
  font-family: "Playfair Display", Georgia, serif;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.01em;
  white-space: nowrap;
}

/* Danh sách chọn chương */
.chapter-dropdown-wrapper {
  flex: 1;
  max-width: 320px;
}

.chapter-select {
  width: 100%;
  padding: 6px 12px;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  outline: none;
  cursor: pointer;
}

.reader-toolbar {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

/* Nút công cụ chung */
.tool-btn {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 5px 10px;
  font-size: 0.85rem;
  font-family: var(--font-sans);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 500;
}

.tool-btn:hover {
  filter: brightness(0.96);
}

.control-group {
  display: inline-flex;
  align-items: center;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  overflow: hidden;
}

.control-group .tool-btn {
  border: none;
  border-radius: 0;
  padding: 5px 10px;
}

.font-size-label {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  padding: 0 6px;
  color: var(--text-secondary);
  min-width: 44px;
  text-align: center;
}

/* Đổi chủ đề màu (Theme Switcher) */
.theme-switcher {
  display: inline-flex;
  gap: 5px;
  padding: 2px 4px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 20px;
}

.theme-btn {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 1px solid rgba(0, 0, 0, 0.15);
  cursor: pointer;
}

.theme-btn.active {
  box-shadow: 0 0 0 2px var(--accent-color);
}

.theme-light { background: #fdfdfd; }
.theme-sepia { background: #f7f1e3; }
.theme-dark  { background: #1f2024; border-color: #444; }

/* Nút nhạc nền */
.music-toggle-btn {
  gap: 5px;
  background: var(--card-bg);
  border-color: var(--accent-color);
  color: var(--accent-color);
}

.music-toggle-btn.active {
  background: var(--accent-color);
  color: #ffffff;
}

/* ==========================================================
   KHUNG NHẠC NỀN AMBIENT DRAWER
   ========================================================== */
.ambient-drawer {
  max-width: 820px;
  margin: 18px auto 0;
  padding: 0 20px;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.ambient-drawer.collapsed {
  display: none;
}

.ambient-inner {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 14px 18px;
  box-shadow: var(--shadow-sm);
}

.ambient-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.ambient-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.pulse-indicator {
  width: 8px;
  height: 8px;
  background: #10b981;
  border-radius: 50%;
  box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 6px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.ambient-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.sub-btn {
  background: none;
  border: 1px dashed var(--border-color);
  color: var(--text-secondary);
  padding: 3px 8px;
  border-radius: 6px;
  font-size: 0.78rem;
  font-family: var(--font-sans);
  cursor: pointer;
}

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

.close-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 1rem;
  padding: 2px 6px;
}

.embed-wrapper {
  border-radius: 8px;
  overflow: hidden;
  background: #000;
}

.embed-wrapper iframe {
  display: block;
}

/* Khung chỉnh sửa link nhạc */
.embed-editor {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border-color);
}

.embed-editor.hidden {
  display: none;
}

.editor-help {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.editor-input-group {
  display: flex;
  gap: 8px;
  margin-bottom: 10px;
}

.editor-input-group input {
  flex: 1;
  padding: 7px 12px;
  font-size: 0.85rem;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
}

.primary-btn {
  background: var(--accent-color);
  color: #fff;
  border: none;
  padding: 7px 14px;
  border-radius: 6px;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  cursor: pointer;
}

.preset-links {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  color: var(--text-secondary);
  flex-wrap: wrap;
}

.preset-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 3px 8px;
  border-radius: 4px;
  font-size: 0.75rem;
  cursor: pointer;
}

/* ==========================================================
   NỘI DUNG ĐỌC TRUYỆN DỊCH TỪ MARKDOWN
   ========================================================== */
.reader-container {
  flex: 1;
  max-width: 740px;
  width: 100%;
  margin: 30px auto;
  padding: 0 24px;
}

.story-header {
  margin-bottom: 30px;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 20px;
}

.story-category {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-color);
  font-weight: 600;
  margin-bottom: 8px;
}

.story-meta {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--text-secondary);
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
}

.bullet {
  opacity: 0.5;
}

/* Tiêu đề tự sinh từ Markdown # và ## */
.story-content h1 {
  font-family: "Playfair Display", Georgia, serif;
  font-size: clamp(2rem, 5vw, 2.75rem);
  font-weight: 600;
  line-height: 1.25;
  margin: 0.5em 0 1em;
  text-align: center;
  letter-spacing: -0.01em;
  color: var(--text-primary);
}

.story-content h2 {
  font-family: "Playfair Display", Georgia, serif;
  font-size: 1.45rem;
  margin: 2.2em 0 0.8em;
  line-height: 1.35;
  color: var(--accent-color);
  border-left: 3px solid var(--accent-color);
  padding-left: 12px;
}

.story-content h3 {
  font-family: "Playfair Display", Georgia, serif;
  font-size: 1.2rem;
  margin: 1.8em 0 0.6em;
  color: var(--text-primary);
}

/* Các đoạn văn trong truyện */
.story-content p {
  margin-bottom: 1.6em;
  text-align: justify;
  text-justify: inter-word;
  word-break: break-word;
}

/* Chữ cái đầu dòng to phong cách sách in (Dropcap) cho đoạn đầu */
.story-content > p:first-of-type::first-letter {
  font-family: "Playfair Display", Georgia, serif;
  float: left;
  font-size: 3.4em;
  line-height: 0.8;
  padding-top: 4px;
  padding-right: 10px;
  padding-bottom: 4px;
  color: var(--accent-color);
  font-weight: 600;
}

/* Khung trích dẫn từ Markdown > quote */
.story-content blockquote {
  background: var(--quote-bg);
  border-left: 4px solid var(--accent-color);
  padding: 16px 20px;
  margin: 2em 0;
  border-radius: 0 8px 8px 0;
  font-style: italic;
  color: var(--text-primary);
}

.story-content blockquote p {
  margin-bottom: 0;
}

.story-content hr {
  border: 0;
  height: 1px;
  background: var(--border-color);
  margin: 2.5em 0;
}

.story-content ul, .story-content ol {
  margin: 1.2em 0 1.6em 1.6em;
}

.story-content li {
  margin-bottom: 0.5em;
}

/* Trạng thái tải */
.loading-state {
  text-align: center;
  padding: 60px 0;
  font-family: var(--font-sans);
  color: var(--text-secondary);
}

/* ==========================================================
   ĐIỀU HƯỚNG CHƯƠNG & FOOTER
   ========================================================== */
.chapter-navigation {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 48px;
  padding: 20px 0;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.nav-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 8px 16px;
  border-radius: 6px;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  cursor: pointer;
  text-decoration: none;
}

.nav-btn:hover:not(:disabled) {
  background: var(--accent-color);
  color: #fff;
  border-color: var(--accent-color);
}

.nav-btn:disabled, .nav-btn.disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.chapter-indicator {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.site-footer {
  text-align: center;
  padding: 30px 20px;
  font-family: var(--font-sans);
  font-size: 0.8rem;
  color: var(--text-secondary);
  border-top: 1px solid var(--border-color);
  background: var(--bg-secondary);
}

.site-footer a {
  color: var(--accent-color);
  text-decoration: none;
}

.sub-note {
  margin-top: 4px;
  opacity: 0.8;
}

/* Responsive trên điện thoại */
@media (max-width: 768px) {
  :root {
    --font-size: 17.5px;
    --line-height: 1.75;
  }
  .header-inner {
    justify-content: center;
  }
  .chapter-dropdown-wrapper {
    order: 3;
    max-width: 100%;
    width: 100%;
  }
  .reader-toolbar {
    justify-content: center;
  }
  .story-content p {
    text-align: left;
  }
}