/* ======================================================
   GrayHomebrew – D&D 5e 2024 Homebrew Rules
   Premium Fantasy Theme with Warm Parchment Design
   ====================================================== */

/* --- CSS Variables --- */
:root {
  --color-bg: #1a1410;
  --color-bg-warm: #231c14;
  --color-surface: #2a2218;
  --color-surface-hover: #342a1e;
  --color-card: #2e251b;
  --color-card-hover: #3a2f22;
  --color-border: #5a4a36;
  --color-border-light: #7a6a52;
  --color-primary: #c0392b;
  --color-primary-dark: #962d22;
  --color-primary-light: #e74c3c;
  --color-gold: #d4a54a;
  --color-gold-dark: #b8912e;
  --color-gold-light: #f0c86e;
  --color-text: #e8dcc8;
  --color-text-secondary: #b8a890;
  --color-text-muted: #8a7c6a;
  --color-text-heading: #f5e6c8;
  --color-accent-blue: #4a8fb8;
  --color-accent-green: #5a9a6a;
  --color-accent-purple: #8a6aaa;
  --color-tag-bg: rgba(212, 165, 74, 0.12);
  --color-tag-text: #d4a54a;
  --color-scrollbar: #5a4a36;
  --color-scrollbar-hover: #7a6a52;
  --shadow-card: 0 2px 12px rgba(0, 0, 0, 0.3), 0 1px 3px rgba(0, 0, 0, 0.2);
  --shadow-card-hover: 0 8px 30px rgba(0, 0, 0, 0.4), 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-nav: 0 2px 20px rgba(0, 0, 0, 0.4);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --font-body: 'Noto Serif SC', 'Microsoft YaHei', 'SimSun', serif;
  --font-heading: 'Noto Serif SC', 'Microsoft YaHei', serif;
  --font-mono: 'Fira Code', 'Consolas', monospace;
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
  --transition-slow: 0.4s ease;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  min-height: 100vh;
  overflow-x: hidden;
}

/* Subtle parchment texture overlay */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(212, 165, 74, 0.03) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 20%, rgba(192, 57, 43, 0.02) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 80%, rgba(212, 165, 74, 0.02) 0%, transparent 60%);
  pointer-events: none;
  z-index: 0;
}

/* --- Scrollbar --- */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--color-bg); }
::-webkit-scrollbar-thumb { background: var(--color-scrollbar); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--color-scrollbar-hover); }

/* --- Layout --- */
.app-container {
  display: flex;
  min-height: 100vh;
  position: relative;
  z-index: 1;
}

/* --- Sidebar --- */
.sidebar {
  width: 280px;
  min-width: 280px;
  background: var(--color-bg-warm);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  height: 100vh;
  position: sticky;
  top: 0;
  z-index: 10;
  transition: transform var(--transition-normal);
}

.sidebar-header {
  padding: 24px 20px;
  border-bottom: 1px solid var(--color-border);
  text-align: center;
}

.sidebar-logo {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-gold);
  letter-spacing: 0.05em;
  line-height: 1.4;
  text-shadow: 0 1px 4px rgba(212, 165, 74, 0.2);
}

.sidebar-logo small {
  display: block;
  font-size: 0.7rem;
  font-weight: 400;
  color: var(--color-text-muted);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-top: 4px;
}

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: 12px 0;
}

.nav-section {
  padding: 0 12px;
  margin-bottom: 8px;
}

.nav-section-title {
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  padding: 12px 12px 6px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 14px;
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-size: 0.88rem;
  user-select: none;
  text-decoration: none;
}

.nav-item:hover {
  background: var(--color-surface);
  color: var(--color-text);
}

.nav-item.active {
  background: rgba(192, 57, 43, 0.15);
  color: var(--color-gold);
  font-weight: 500;
}

.nav-item .nav-icon {
  width: 20px;
  text-align: center;
  font-size: 1rem;
  flex-shrink: 0;
}

.nav-item .nav-count {
  margin-left: auto;
  font-size: 0.72rem;
  color: var(--color-text-muted);
  background: rgba(255, 255, 255, 0.05);
  padding: 1px 7px;
  border-radius: 10px;
}

/* --- Main Content --- */
.main-content {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

/* --- Top Bar --- */
.top-bar {
  position: sticky;
  top: 0;
  z-index: 5;
  background: rgba(26, 20, 16, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  padding: 14px 32px;
  display: flex;
  align-items: center;
  gap: 16px;
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-text);
  font-size: 1.4rem;
  cursor: pointer;
  padding: 4px;
}

.search-container {
  flex: 1;
  max-width: 560px;
  position: relative;
}

.search-input {
  width: 100%;
  padding: 10px 16px 10px 42px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 0.92rem;
  outline: none;
  transition: all var(--transition-fast);
}

.search-input::placeholder {
  color: var(--color-text-muted);
}

.search-input:focus {
  border-color: var(--color-gold-dark);
  box-shadow: 0 0 0 3px rgba(212, 165, 74, 0.1);
}

.search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-muted);
  font-size: 0.95rem;
  pointer-events: none;
}

.search-shortcut {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-muted);
  font-size: 0.68rem;
  background: rgba(255, 255, 255, 0.05);
  padding: 2px 8px;
  border-radius: 4px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  pointer-events: none;
}

.filter-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.filter-chip {
  padding: 5px 14px;
  border-radius: 20px;
  font-size: 0.78rem;
  cursor: pointer;
  border: 1px solid var(--color-border);
  background: transparent;
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
  user-select: none;
}

.filter-chip:hover {
  border-color: var(--color-gold-dark);
  color: var(--color-gold);
}

.filter-chip.active {
  background: rgba(212, 165, 74, 0.15);
  border-color: var(--color-gold-dark);
  color: var(--color-gold);
}

/* --- Page Content --- */
.page-content {
  flex: 1;
  padding: 32px;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

.page-title {
  font-family: var(--font-heading);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--color-text-heading);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.page-title .title-icon {
  font-size: 1.5rem;
}

.page-subtitle {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 28px;
}

.results-info {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  margin-bottom: 20px;
}

/* --- Feat Cards --- */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
  gap: 20px;
}

.feat-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 0;
  overflow: hidden;
  transition: all var(--transition-normal);
  cursor: default;
}

.feat-card:hover {
  border-color: var(--color-gold-dark);
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-2px);
}

.feat-card-header {
  padding: 18px 22px 14px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  position: relative;
}

.feat-card-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-gold));
  opacity: 0.8;
}

.feat-card.type-origin .feat-card-header::before {
  background: linear-gradient(90deg, #5a9a6a, #7ac28a);
}

.feat-card.type-general .feat-card-header::before {
  background: linear-gradient(90deg, var(--color-accent-blue), #6ab8e8);
}

.feat-card.type-class .feat-card-header::before {
  background: linear-gradient(90deg, var(--color-primary), var(--color-gold));
}

.feat-card.type-epic .feat-card-header::before {
  background: linear-gradient(90deg, var(--color-accent-purple), #b08ada);
}

.feat-name {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-text-heading);
  margin-bottom: 6px;
}

.feat-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.feat-type-badge {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 2px 10px;
  border-radius: 10px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge-origin { background: rgba(90, 154, 106, 0.2); color: #7ac28a; }
.badge-general { background: rgba(74, 143, 184, 0.2); color: #6ab8e8; }
.badge-class { background: rgba(192, 57, 43, 0.2); color: #e87a6e; }
.badge-epic { background: rgba(138, 106, 170, 0.2); color: #b08ada; }

.feat-prerequisite {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  font-style: italic;
}

.feat-card-body {
  padding: 16px 22px 20px;
}

.feat-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}

.feat-tag {
  font-size: 0.7rem;
  padding: 2px 8px;
  border-radius: 4px;
  background: var(--color-tag-bg);
  color: var(--color-tag-text);
}

.benefit-item {
  margin-bottom: 12px;
}

.benefit-item:last-child {
  margin-bottom: 0;
}

.benefit-name {
  font-weight: 700;
  color: var(--color-gold);
  font-size: 0.88rem;
  margin-bottom: 2px;
}

.benefit-text {
  font-size: 0.86rem;
  color: var(--color-text-secondary);
  line-height: 1.65;
}

/* --- Rule Cards --- */
.rule-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 0;
  overflow: hidden;
  margin-bottom: 20px;
  transition: all var(--transition-normal);
}

.rule-card:hover {
  border-color: var(--color-border-light);
  box-shadow: var(--shadow-card);
}

.rule-card-header {
  padding: 16px 22px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  user-select: none;
}

.rule-card-header::before {
  content: '';
  width: 4px;
  height: 24px;
  border-radius: 2px;
  background: var(--color-primary);
  flex-shrink: 0;
}

.rule-title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text-heading);
  flex: 1;
}

.rule-category-badge {
  font-size: 0.7rem;
  padding: 2px 10px;
  border-radius: 10px;
  background: rgba(212, 165, 74, 0.12);
  color: var(--color-gold);
}

.rule-toggle {
  color: var(--color-text-muted);
  transition: transform var(--transition-fast);
  font-size: 0.85rem;
}

.rule-card.open .rule-toggle {
  transform: rotate(180deg);
}

.rule-card-body {
  padding: 0 22px 20px;
  font-size: 0.88rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  display: none;
}

.rule-card.open .rule-card-body {
  display: block;
}

.rule-card-body strong {
  color: var(--color-gold);
  font-weight: 600;
}

/* --- Home Page --- */
.home-hero {
  text-align: center;
  padding: 60px 20px 40px;
}

.home-hero h1 {
  font-family: var(--font-heading);
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--color-gold);
  margin-bottom: 12px;
  text-shadow: 0 2px 12px rgba(212, 165, 74, 0.15);
}

.home-hero p {
  font-size: 1rem;
  color: var(--color-text-muted);
  max-width: 500px;
  margin: 0 auto;
}

.home-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 16px;
  max-width: 700px;
  margin: 40px auto;
}

.stat-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  text-align: center;
  transition: all var(--transition-fast);
}

.stat-card:hover {
  border-color: var(--color-gold-dark);
  transform: translateY(-2px);
}

.stat-number {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-gold);
  line-height: 1.2;
}

.stat-label {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  margin-top: 4px;
}

.home-quick-nav {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 16px;
  max-width: 900px;
  margin: 0 auto;
  padding: 0 20px;
}

.quick-nav-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  cursor: pointer;
  transition: all var(--transition-normal);
  text-decoration: none;
  color: inherit;
}

.quick-nav-card:hover {
  border-color: var(--color-gold-dark);
  box-shadow: var(--shadow-card);
  transform: translateY(-2px);
}

.quick-nav-icon {
  font-size: 1.8rem;
  margin-bottom: 10px;
}

.quick-nav-title {
  font-weight: 700;
  color: var(--color-text-heading);
  margin-bottom: 4px;
}

.quick-nav-desc {
  font-size: 0.82rem;
  color: var(--color-text-muted);
}

/* --- Loading & Empty --- */
.loading-spinner {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 60px;
}

.spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-gold);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--color-text-muted);
}

.empty-state-icon {
  font-size: 3rem;
  margin-bottom: 16px;
  opacity: 0.4;
}

.empty-state-text {
  font-size: 1rem;
  margin-bottom: 8px;
}

.empty-state-hint {
  font-size: 0.82rem;
}

/* --- Back to Top --- */
.back-to-top {
  position: fixed;
  bottom: 28px;
  right: 28px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  border: none;
  cursor: pointer;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  box-shadow: 0 4px 16px rgba(192, 57, 43, 0.3);
  z-index: 50;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: var(--color-primary-light);
  transform: translateY(-3px);
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .cards-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    transform: translateX(-100%);
    z-index: 100;
    box-shadow: none;
  }

  .sidebar.open {
    transform: translateX(0);
    box-shadow: 4px 0 30px rgba(0, 0, 0, 0.5);
  }

  .sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 99;
  }

  .sidebar-overlay.visible {
    display: block;
  }

  .menu-toggle {
    display: block;
  }

  .top-bar {
    padding: 12px 16px;
  }

  .page-content {
    padding: 20px 16px;
  }

  .page-title {
    font-size: 1.4rem;
  }

  .home-hero h1 {
    font-size: 1.8rem;
  }

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

  .filter-bar {
    overflow-x: auto;
    flex-wrap: nowrap;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  .filter-bar::-webkit-scrollbar { display: none; }

  .filter-chip {
    white-space: nowrap;
    flex-shrink: 0;
  }
}

/* --- Highlight for search --- */
mark {
  background: rgba(212, 165, 74, 0.3);
  color: var(--color-text);
  border-radius: 2px;
  padding: 0 2px;
}

/* --- Animation --- */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.fade-in {
  animation: fadeIn 0.3s ease forwards;
}

.cards-grid .feat-card {
  animation: fadeIn 0.3s ease forwards;
}

.cards-grid .feat-card:nth-child(2) { animation-delay: 0.03s; }
.cards-grid .feat-card:nth-child(3) { animation-delay: 0.06s; }
.cards-grid .feat-card:nth-child(4) { animation-delay: 0.09s; }
.cards-grid .feat-card:nth-child(5) { animation-delay: 0.12s; }
.cards-grid .feat-card:nth-child(6) { animation-delay: 0.15s; }

/* --- Print --- */
@media print {
  .sidebar, .top-bar, .back-to-top { display: none; }
  .main-content { margin: 0; }
  .page-content { max-width: 100%; padding: 0; }
  .feat-card { break-inside: avoid; page-break-inside: avoid; box-shadow: none; border: 1px solid #ccc; }
  body { background: #fff; color: #333; }
  .feat-name { color: #800000; }
  .benefit-name { color: #b8912e; }
}