/* ==========================================================================
   THANHCA.XUANDUC.NET - CORE STYLESHEET
   Design System: Marian Blue, Church Gold Accent, Clean Modern Typography
   Full Dark Mode Support for Choir Performance
   ========================================================================== */

:root {
  /* Light Theme Palette */
  --bg-page: #f8fafc;
  --bg-card: #ffffff;
  --bg-secondary: #f1f5f9;
  --border-color: #e2e8f0;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --text-light: #94a3b8;

  /* Church / Marian Identity Colors */
  --marian-blue: #1d4ed8;
  --marian-blue-dark: #1e3a8a;
  --marian-blue-light: #eff6ff;
  --marian-blue-border: #bfdbfe;
  
  --gold-accent: #d97706;
  --gold-light: #fef3c7;
  --gold-border: #fde68a;

  --success-color: #16a34a;
  --danger-color: #dc2626;

  /* Typography */
  --font-main: 'Lexend', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-music: 'Newsreader', Georgia, serif;

  /* Elevations & Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
  --shadow-modal: 0 20px 25px -5px rgba(0, 0, 0, 0.2), 0 8px 10px -6px rgba(0, 0, 0, 0.1);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
}

/* Dark Mode Theme */
[data-theme="dark"] {
  --bg-page: #0b0f19;
  --bg-card: #131b2e;
  --bg-secondary: #1a243b;
  --border-color: #23314e;
  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --text-light: #64748b;

  --marian-blue: #3b82f6;
  --marian-blue-dark: #60a5fa;
  --marian-blue-light: #172554;
  --marian-blue-border: #1e3a8a;

  --gold-accent: #f59e0b;
  --gold-light: #451a03;
  --gold-border: #78350f;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.6);
}

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

html {
  font-family: var(--font-main);
  background-color: var(--bg-page);
  color: var(--text-main);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* Container */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 16px;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  backdrop-filter: blur(12px);
  transition: background-color var(--transition-normal);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* Logo Brand - Dung chung voi trang chu Giao Xu Xuan Duc */
.brand-logo-wrap {
  position: relative;
  display: inline-flex;
  align-items: center;
  height: 44px;
}

.brand-logo-gradient {
  display: inline-block;
  height: 44px;
  width: 145px;
  background: linear-gradient(135deg, #1C246B 0%, #212B78 30%, #0D50A2 70%, #1E88E5 100%);
  -webkit-mask: url('https://xuanduc.net/wp-content/uploads/2021/09/matSAU-1-1.png') no-repeat center left / contain;
  mask: url('https://xuanduc.net/wp-content/uploads/2021/09/matSAU-1-1.png') no-repeat center left / contain;
  transition: all var(--transition-fast);
}

[data-theme="dark"] .brand-logo-gradient {
  background: linear-gradient(135deg, #60a5fa 0%, #93c5fd 50%, #e2e8f0 100%);
}

.brand-logo-img {
  display: none;
  height: 44px;
  width: auto;
  max-width: 145px;
  object-fit: contain;
}

@supports not ((-webkit-mask: paint) or (mask: paint)) {
  .brand-logo-gradient {
    display: none;
  }
  .brand-logo-img {
    display: block;
  }
}

.brand-link:hover .brand-logo-gradient {
  transform: scale(1.02);
  filter: brightness(1.12);
}

.brand-info {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--marian-blue);
  line-height: 1.2;
}

[data-theme="dark"] .brand-title {
  color: #60a5fa;
}

.brand-sub {
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.btn-header {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  font-size: 13px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  transition: all var(--transition-fast);
}

.btn-header:hover {
  background: var(--marian-blue-light);
  border-color: var(--marian-blue-border);
  color: var(--marian-blue);
}

.theme-toggle-btn {
  width: 38px;
  height: 38px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  font-size: 13px;
  font-weight: 600;
  transition: all var(--transition-fast);
}

.theme-toggle-btn:hover {
  background: var(--gold-light);
  border-color: var(--gold-border);
  color: var(--gold-accent);
}

/* Hero Section */
.hero-section {
  background: linear-gradient(180deg, var(--bg-card) 0%, var(--bg-page) 100%);
  padding: 32px 0 24px;
  border-bottom: 1px solid var(--border-color);
}

.hero-content {
  text-align: center;
  max-width: 760px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  background: var(--marian-blue-light);
  color: var(--marian-blue);
  border: 1px solid var(--marian-blue-border);
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 12px;
}

.hero-title {
  font-size: 28px;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 8px;
  letter-spacing: -0.5px;
}

.hero-desc {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 24px;
}

/* Search Box Component */
.search-wrapper {
  position: relative;
  background: var(--bg-card);
  border: 2px solid var(--marian-blue-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: 6px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: all var(--transition-fast);
}

.search-wrapper:focus-within {
  border-color: var(--marian-blue);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.15);
}

.search-input-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 8px;
}

.search-icon-symbol {
  font-size: 18px;
  font-weight: 700;
  color: var(--marian-blue);
}

.search-input {
  flex-grow: 1;
  border: none;
  background: transparent;
  font-size: 16px;
  font-weight: 500;
  color: var(--text-main);
  outline: none;
  font-family: inherit;
}

.search-input::placeholder {
  color: var(--text-light);
  font-weight: 400;
}

.search-clear-btn {
  font-size: 12px;
  font-weight: 600;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  color: var(--text-muted);
  display: none;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.search-clear-btn.is-visible {
  display: inline-block;
}

.search-clear-btn:hover {
  background: var(--border-color);
  color: var(--text-main);
}

.search-submit-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 18px;
  font-size: 13.5px;
  font-weight: 700;
  border-radius: var(--radius-sm);
  background: var(--marian-blue);
  color: #ffffff;
  border: 1px solid transparent;
  transition: all var(--transition-fast);
  white-space: nowrap;
  letter-spacing: 0.2px;
  box-shadow: 0 2px 6px rgba(37, 99, 235, 0.25);
  cursor: pointer;
}

.search-submit-btn:hover:not(:disabled) {
  background: var(--marian-blue-dark);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.35);
  transform: translateY(-1px);
}

.search-submit-btn:active:not(:disabled) {
  transform: translateY(0);
}

.search-submit-btn:disabled,
.search-submit-btn.is-loading {
  opacity: 0.75;
  cursor: wait;
  background: #64748b !important;
  box-shadow: none !important;
  transform: none !important;
}

.search-options-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border-color);
  padding-top: 8px;
  font-size: 12.5px;
  gap: 8px;
  flex-wrap: wrap;
}

.search-types {
  display: flex;
  align-items: center;
  gap: 6px;
}

.search-type-label {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  color: var(--text-muted);
  font-weight: 500;
  cursor: pointer;
  user-select: none;
  transition: all var(--transition-fast);
}

.search-type-label:has(input:checked) {
  background: var(--marian-blue);
  color: #ffffff;
  font-weight: 600;
}

.search-type-label input {
  display: none;
}

.search-stats-text {
  font-size: 12px;
  color: var(--text-muted);
}

/* Alphabet Quick Filter */
.alphabet-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  flex-wrap: wrap;
  margin-top: 18px;
  padding: 6px 0;
}

.alpha-btn {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  color: var(--text-muted);
  border: 1px solid var(--border-color);
  transition: all var(--transition-fast);
}

.alpha-btn:hover,
.alpha-btn.is-active {
  background: var(--marian-blue);
  color: #ffffff;
  border-color: var(--marian-blue);
}

/* Category Filter Tags */
.filter-tabs-section {
  padding: 16px 0 8px;
}

.filter-pills-wrap {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 8px;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.filter-pill {
  white-space: nowrap;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: 500;
  background: var(--bg-card);
  color: var(--text-muted);
  border: 1px solid var(--border-color);
  transition: all var(--transition-fast);
}

.filter-pill:hover {
  background: var(--bg-secondary);
  color: var(--text-main);
}

.filter-pill.is-active {
  background: var(--marian-blue);
  color: #ffffff;
  border-color: var(--marian-blue);
  font-weight: 600;
  box-shadow: var(--shadow-sm);
}

/* Main Content Layout */
.main-content {
  flex-grow: 1;
  padding: 16px 0 40px;
}

.section-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

.section-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 6px;
}

.result-counter {
  font-size: 12px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background: var(--marian-blue-light);
  color: var(--marian-blue);
  border: 1px solid var(--marian-blue-border);
}

/* Songs Grid */
.songs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 16px;
}

@media (max-width: 640px) {
  .songs-grid {
    grid-template-columns: 1fr;
  }
}

/* Song Card */
.song-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 12px;
  transition: all var(--transition-fast);
  position: relative;
}

.song-card:hover {
  border-color: var(--marian-blue-border);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.song-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 8px;
}

.song-card-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--marian-blue);
  line-height: 1.35;
  cursor: pointer;
  flex-grow: 1;
}

[data-theme="dark"] .song-card-title {
  color: #60a5fa;
}

.song-card-title:hover {
  text-decoration: underline;
}

.btn-bookmark {
  color: var(--text-light);
  font-size: 18px;
  line-height: 1;
  padding: 4px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.btn-bookmark:hover,
.btn-bookmark.is-bookmarked {
  color: var(--gold-accent);
}

.song-meta-row {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  font-size: 12px;
}

.song-composer-tag {
  color: var(--text-muted);
  font-weight: 600;
}

.song-composer-tag a {
  color: var(--text-main);
  text-decoration: underline dotted;
}

.song-composer-tag a:hover {
  color: var(--marian-blue);
}

.song-category-badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 4px;
  background: var(--bg-secondary);
  color: var(--text-muted);
  border: 1px solid var(--border-color);
}

.song-first-verse {
  font-family: var(--font-music);
  font-style: italic;
  font-size: 14.5px;
  color: var(--text-muted);
  line-height: 1.45;
  background: var(--bg-secondary);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--marian-blue);
}

.song-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 8px;
  border-top: 1px solid var(--border-color);
  gap: 8px;
}

.btn-view-pdf {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--marian-blue);
  color: #ffffff;
  font-size: 13px;
  font-weight: 600;
  padding: 7px 14px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.btn-view-pdf:hover {
  background: var(--marian-blue-dark);
}

.btn-download-pdf {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-secondary);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  font-size: 13px;
  font-weight: 600;
  padding: 7px 12px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.btn-download-pdf:hover {
  background: var(--gold-light);
  border-color: var(--gold-border);
  color: var(--gold-accent);
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  background: var(--bg-card);
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-lg);
  grid-column: 1 / -1;
}

.empty-state-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 6px;
}

.empty-state-desc {
  font-size: 13.5px;
  color: var(--text-muted);
  max-width: 480px;
  margin: 0 auto 16px;
}

/* PDF Modal Viewer */
.pdf-modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(6px);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 12px;
}

.pdf-modal-overlay.is-active {
  display: flex;
}

.pdf-modal-container {
  width: 100%;
  max-width: 960px;
  height: 94vh;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-modal);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.pdf-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 18px;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  gap: 12px;
}

.pdf-modal-title-box {
  min-width: 0;
}

.pdf-modal-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.pdf-modal-subtitle {
  font-size: 12px;
  color: var(--text-muted);
}

.pdf-toolbar {
  display: flex;
  align-items: center;
  gap: 6px;
}

.pdf-tool-btn {
  padding: 6px 10px;
  font-size: 12.5px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  transition: all var(--transition-fast);
}

.pdf-tool-btn:hover {
  background: var(--border-color);
}

.pdf-tool-btn.btn-invert.is-inverted {
  background: var(--gold-accent);
  color: #ffffff;
  border-color: var(--gold-accent);
}

.pdf-modal-body {
  flex-grow: 1;
  background: #525659;
  position: relative;
  overflow: hidden;
}

.pdf-modal-body iframe,
.pdf-modal-body embed {
  width: 100%;
  height: 100%;
  border: none;
}

.pdf-modal-body.is-inverted iframe,
.pdf-modal-body.is-inverted embed {
  filter: invert(0.9) hue-rotate(180deg);
}

/* Footer */
.site-footer {
  background: var(--bg-card);
  border-top: 1px solid var(--border-color);
  padding: 24px 0;
  margin-top: auto;
  font-size: 13px;
  color: var(--text-muted);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-links a {
  color: var(--marian-blue);
  font-weight: 500;
  margin-left: 14px;
}

.footer-links a:hover {
  text-decoration: underline;
}

/* Trang thai dang tim kiem tren server (Loading State) */
.search-loading-box {
  grid-column: 1 / -1;
  text-align: center;
  padding: 48px 20px;
  background: var(--bg-card);
  border: 1px dashed var(--marian-blue-border);
  border-radius: var(--radius-lg);
  margin: 16px 0;
}

.search-spinner {
  width: 38px;
  height: 38px;
  margin: 0 auto 16px;
  border: 3.5px solid var(--border-color);
  border-top-color: var(--marian-blue);
  border-radius: 50%;
  animation: xd-spin 0.8s linear infinite;
}

@keyframes xd-spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.search-loading-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 6px;
}

.search-loading-desc {
  font-size: 13.5px;
  color: var(--text-muted);
}

/* Responsive Media Queries */
@media (max-width: 768px) {
  .header-inner {
    height: 58px;
  }

  .brand-logo-gradient,
  .brand-logo-img {
    height: 36px;
    width: 115px;
  }

  .brand-title {
    font-size: 14.5px;
  }

  .brand-sub {
    font-size: 9.5px;
  }

  .search-input-row {
    flex-wrap: wrap;
    gap: 8px;
  }

  .search-input {
    width: 100%;
    order: 1;
    font-size: 15px;
  }

  .search-icon-symbol {
    order: 0;
  }

  .search-clear-btn {
    order: 2;
    padding: 6px 12px;
  }

  .search-submit-btn {
    order: 3;
    width: 100%;
    padding: 10px 16px;
    font-size: 14px;
    margin-top: 4px;
  }

  .btn-header {
    padding: 6px 10px;
    font-size: 12px;
  }

  .theme-toggle-btn {
    width: 34px;
    height: 34px;
  }
}

@media (max-width: 480px) {
  .brand-sub {
    display: none;
  }
}