/* ==================== CSS VARIABLES ==================== */
:root {
  /* Colors */
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-primary-light: #dbeafe;
  --color-primary-lighter: #eff6ff;

  --color-secondary: #6366f1;
  --color-secondary-dark: #4338ca;
  --color-secondary-light: #c7d2fe;
  --color-secondary-lighter: #eef2ff;

  --color-purple: #a855f7;
  --color-purple-light: #d8b4fe;
  --color-purple-lighter: #faf5ff;

  --color-text: #334155;
  --color-text-light: #64748b;
  --color-text-dark: #1e293b;

  --color-bg: #f8fafc;
  --color-bg-light: #f1f5f9;
  --color-border: #e2e8f0;
  --color-border-light: #cbd5e1;

  --color-amber: #f59e0b;
  --color-amber-bg: #fffbeb;
  --color-amber-border: #fbbf24;

  --color-rose: #e11d48;
  --color-rose-bg: #fff1f2;
  --color-rose-border: #fda4af;

  --color-green-bg: #f0fdf4;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 0.75rem;
  --spacing-lg: 1rem;
  --spacing-xl: 1.5rem;
  --spacing-2xl: 2rem;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 25px rgba(99, 102, 241, 0.1);
  --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

/* ==================== RESET & BASE ==================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
  line-height: 1.6;
  color: var(--color-text);
  background: linear-gradient(to bottom, var(--color-bg), #ffffff);
  min-height: 100vh;
}

/* ==================== HEADER ==================== */
.header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.header-container {
  max-width: 1152px;
  margin: 0 auto;
  padding: var(--spacing-lg);
}

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

.header-branding {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.header-logo { height: 2rem; }

.header-divider {
  border-left: 1px solid var(--color-border-light);
  height: 40px;
}

.header-title-section { padding-left: var(--spacing-lg); }

.header-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text-dark);
}

.header-title-accent { color: var(--color-primary); }

.header-subtitle {
  font-size: 0.875rem;
  color: var(--color-text-light);
  margin-top: 0.125rem;
  display: none;
}

/* Mobile Menu Button */
.mobile-menu-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text-light);
  border-radius: var(--radius-md);
  transition: background-color 0.2s;
}

.mobile-menu-btn:hover { background: var(--color-bg-light); }

.mobile-menu-icon { width: 20px; height: 20px; }
.mobile-menu-close-icon { display: none; }
.mobile-menu-btn.active .mobile-menu-icon:not(.mobile-menu-close-icon) { display: none; }
.mobile-menu-btn.active .mobile-menu-close-icon { display: block; }

/* ==================== NAVIGATION ==================== */
.desktop-nav {
  display: none;
  gap: var(--spacing-xs);
  margin-top: var(--spacing-lg);
  flex-wrap: wrap;
}

.nav-item,
.mobile-nav-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-light);
  background: none;
  border: none;
  cursor: pointer;
  transition: all 0.2s;
}

.nav-item:hover { background: var(--color-bg-light); }
.nav-item svg,
.mobile-nav-item svg { width: 16px; height: 16px; }

.nav-item.active {
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
}

.nav-item.editor-item.active,
.mobile-nav-item.editor-item.active {
  background: var(--color-secondary-lighter);
  color: var(--color-secondary-dark);
}

.badge {
  font-size: 0.75rem;
  padding: 0.375rem;
  background: var(--color-secondary-lighter);
  color: var(--color-secondary);
  border-radius: var(--radius-sm);
}

/* Mobile Navigation */
.mobile-nav {
  display: none;
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--color-bg-light);
  animation: slideDown 0.2s ease-out;
}

.mobile-nav.active { display: block; }

.mobile-nav-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-sm);
}

.mobile-nav-item {
  padding: 0.625rem var(--spacing-md);
  border-radius: var(--radius-md);
  background: var(--color-bg);
}

.mobile-nav-item.active {
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
}

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

/* ==================== MAIN CONTENT ==================== */
.main-content {
  max-width: 896px;
  margin: 0 auto;
  padding: var(--spacing-2xl) var(--spacing-lg);
}

/* ==================== HERO BANNER ==================== */
.hero-banner {
  text-align: center;
  padding: var(--spacing-lg) 0 var(--spacing-2xl);
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: var(--spacing-xl);
}

.hero-badge svg { width: 16px; height: 16px; }

.hero-title {
  font-size: 1.875rem;
  font-weight: 700;
  color: var(--color-text-dark);
  margin-bottom: var(--spacing-lg);
}

.hero-description {
  font-size: 1.125rem;
  color: var(--color-text-light);
  max-width: 672px;
  margin: 0 auto;
}

/* ==================== SECTION CARDS ==================== */
.section-card {
  background: white;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: var(--spacing-2xl);
  scroll-margin-top: 6rem;
}

.section-card-editor {
  border: 2px solid #a5b4fc;
  box-shadow: var(--shadow-lg);
}

.section-content { padding: var(--spacing-2xl); }

.section-content-editor {
  background: linear-gradient(to bottom right, var(--color-secondary-lighter), var(--color-purple-lighter), #ffffff);
}

.section-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
}

.section-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-lg);
  background: var(--color-primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.section-icon svg {
  width: 24px;
  height: 24px;
  color: var(--color-primary);
}

.section-icon-editor {
  background: linear-gradient(to bottom right, var(--color-secondary), var(--color-purple));
  box-shadow: 0 4px 6px rgba(99, 102, 241, 0.3);
}

.section-icon-editor svg { color: white; }

.section-title {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-text-dark);
}

.section-subtitle-editor {
  font-size: 0.875rem;
  color: var(--color-secondary);
  font-weight: 500;
  margin-top: 0.125rem;
}

/* Editor Banner */
.editor-banner {
  background: linear-gradient(to right, var(--color-secondary), var(--color-purple));
  color: white;
  padding: var(--spacing-md) var(--spacing-lg);
  font-size: 0.875rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.editor-banner-content {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.editor-banner-content svg { width: 20px; height: 20px; }

.editor-banner-badge {
  background: rgba(255, 255, 255, 0.2);
  color: white;
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  border: 1px solid rgba(255, 255, 255, 0.3);
}

/* ==================== TEXT CONTENT ==================== */
.text-content {
  color: var(--color-text-light);
  margin-bottom: var(--spacing-lg);
  line-height: 1.7;
}

/* ==================== STEP LIST ==================== */
.step-list {
  list-style: none;
  margin: var(--spacing-lg) 0;
}

.step-item {
  display: flex;
  gap: var(--spacing-md);
  align-items: flex-start;
  margin-bottom: var(--spacing-md);
}

.step-number {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--color-primary-light);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  font-weight: 600;
}

.step-text {
  color: var(--color-text-light);
  padding-top: 0.125rem;
}

/* ==================== INFO & TIP BOXES ==================== */
.info-box,
.tip-box {
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.info-box-blue,
.tip-box {
  background: var(--color-amber-bg);
  border: 1px solid var(--color-amber-border);
}

.tip-box-info {
  background: var(--color-primary-light);
  border: 1px solid #93c5fd;
}

.info-box-title {
  font-weight: 600;
  color: #1e3a8a;
  margin-bottom: var(--spacing-sm);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.info-box-title svg { width: 16px; height: 16px; }

.info-box-text {
  font-size: 0.875rem;
  color: var(--color-text);
  margin-bottom: var(--spacing-sm);
}

.info-box-list {
  font-size: 0.875rem;
  color: var(--color-text);
  list-style: none;
}

.info-box-list li { margin-bottom: var(--spacing-xs); }

.tip-box-content {
  display: flex;
  gap: var(--spacing-md);
}

.tip-icon {
  width: 20px;
  height: 20px;
  color: var(--color-amber);
  flex-shrink: 0;
  margin-top: 0.125rem;
}

.tip-icon-info { color: var(--color-primary); }

.tip-text {
  font-size: 0.875rem;
  color: var(--color-text);
}

.tip-list { list-style: none; }

.tip-list li {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
}

.tip-list li:last-child { margin-bottom: 0; }

.inline-icon {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  margin-top: 0.125rem;
}

.inline-code {
  background: white;
  padding: 0.125rem 0.375rem;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-family: monospace;
}

.code-snippet {
  background: var(--color-bg-light);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  color: var(--color-primary);
  font-family: monospace;
  font-size: 0.875rem;
  flex-shrink: 0;
}

.simple-list {
  list-style: none;
  font-size: 0.875rem;
  color: var(--color-text-light);
}

.simple-list li { margin-bottom: var(--spacing-xs); }

/* ==================== FEATURE GRID ==================== */
.feature-grid {
  display: grid;
  gap: var(--spacing-lg);
  margin: var(--spacing-xl) 0;
}

.feature-item {
  display: flex;
  gap: var(--spacing-lg);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  background: var(--color-bg);
  transition: background 0.2s;
}

.feature-item:hover { background: var(--color-bg-light); }

.feature-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: white;
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.feature-icon svg {
  width: 20px;
  height: 20px;
  color: var(--color-primary);
}

.feature-title {
  font-weight: 500;
  color: var(--color-text-dark);
  margin-bottom: var(--spacing-xs);
}

.feature-description {
  font-size: 0.875rem;
  color: var(--color-text-light);
}

/* ==================== VIEW MODES & SHARING ==================== */
.view-modes-grid,
.sharing-grid,
.metadata-types-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
  margin: var(--spacing-xl) 0;
}

.view-mode-card,
.sharing-card {
  padding: var(--spacing-lg);
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  text-align: center;
  transition: all 0.2s;
}

.view-mode-card:hover {
  background: var(--color-bg-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.view-mode-icon,
.sharing-icon {
  width: 32px;
  height: 32px;
  color: var(--color-primary);
  margin: 0 auto var(--spacing-md);
}

.view-mode-title,
.sharing-title {
  font-weight: 600;
  color: var(--color-text-dark);
  margin-bottom: var(--spacing-sm);
}

.view-mode-description,
.sharing-description {
  font-size: 0.875rem;
  color: var(--color-text-light);
}

.sharing-card { text-align: left; }
.sharing-icon { margin: 0 0 var(--spacing-md) 0; }

/* ==================== SUBSECTION ==================== */
.subsection { margin: var(--spacing-xl) 0; }

.subsection-title {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-weight: 600;
  color: var(--color-text-dark);
  margin-top: 2.5rem;
  margin-bottom: 1.25rem;
  padding-bottom: var(--spacing-md);
  border-bottom: 2px solid var(--color-border);
}

.subsection-icon {
  width: 20px;
  height: 20px;
  color: var(--color-primary);
}

/* ==================== EDITOR DIVIDER ==================== */
.editor-divider {
  position: relative;
  padding: 3rem 0;
  margin: var(--spacing-2xl) 0;
}

.editor-divider-line {
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-secondary-light);
}

.editor-divider-badge {
  position: relative;
  max-width: fit-content;
  margin: 0 auto;
  background: linear-gradient(to right, var(--color-secondary), var(--color-purple));
  padding: var(--spacing-lg) var(--spacing-2xl);
  color: white;
  border-radius: 16px;
  box-shadow: 0 10px 25px rgba(99, 102, 241, 0.3);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  border: 2px solid white;
}

.editor-divider-badge svg { width: 24px; height: 24px; }

.editor-divider-title {
  font-weight: 700;
  font-size: 1.125rem;
}

.editor-divider-subtitle {
  font-size: 0.75rem;
  color: var(--color-secondary-lighter);
}

/* ==================== EDITOR FEATURE BOX ==================== */
.editor-feature-box {
  background: linear-gradient(to right, var(--color-amber-bg), #fffbeb);
  border: 2px solid var(--color-amber-border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  margin: var(--spacing-xl) 0;
}

.editor-feature-content {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
}

.editor-feature-icon {
  width: 20px;
  height: 20px;
  color: var(--color-amber);
  flex-shrink: 0;
  margin-top: 0.125rem;
}

.editor-feature-title {
  font-weight: 600;
  color: #312e81;
  margin-bottom: var(--spacing-sm);
}

/* ==================== TAGS & METADATA ==================== */
.tags-best-practices {
  background: linear-gradient(to bottom right, var(--color-green-bg), #dcfce7);
  border: 2px solid var(--color-secondary-light);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  margin: var(--spacing-xl) 0;
}

.tags-best-practices-title {
  font-weight: 600;
  color: #312e81;
  margin-bottom: var(--spacing-md);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.tags-best-practices-title svg { width: 20px; height: 20px; }

.tags-examples-section { margin-bottom: var(--spacing-md); }

.tags-examples-label {
  font-size: 0.875rem;
  color: var(--color-text);
  margin-bottom: var(--spacing-sm);
}

.tags-examples {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.tag-badge {
  background: white;
  color: #4f46e5;
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: 6px;
  font-size: 0.75rem;
  border: 2px solid var(--color-secondary-light);
  box-shadow: var(--shadow-sm);
}

.tags-best-practices-list {
  list-style: none;
  font-size: 0.875rem;
  color: var(--color-text);
}

.tags-best-practices-list li { margin-bottom: var(--spacing-xs); }

.tag-warning-item {
  display: flex;
  gap: var(--spacing-md);
  align-items: flex-start;
  background: var(--color-rose-bg);
  border: 1px solid var(--color-rose-border);
  color: #9f1239;
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  margin: var(--spacing-md) 0;
  font-size: 0.875rem;
  line-height: 1.5;
  list-style: none;
}

.tag-warning-item i {
  width: 20px;
  height: 20px;
  color: var(--color-rose);
  flex-shrink: 0;
  margin-top: 0.125rem;
}

.tag-warning-item .inline-code {
  background: #fff;
  border: 1px solid #fecdd3;
  color: #be123c;
}

/* Metadata Types */
.metadata-types-grid { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }

.metadata-type-card {
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
}

.metadata-type-indigo {
  background: linear-gradient(to bottom right, var(--color-secondary-lighter), #ffffff);
  border: 2px solid var(--color-secondary-light);
}

.metadata-type-purple {
  background: linear-gradient(to bottom right, var(--color-purple-lighter), #ffffff);
  border: 2px solid var(--color-purple-light);
}

.metadata-type-icon {
  width: 24px;
  height: 24px;
  margin-bottom: var(--spacing-sm);
}

.metadata-type-indigo .metadata-type-icon { color: var(--color-secondary); }
.metadata-type-purple .metadata-type-icon { color: var(--color-purple); }

.metadata-type-title {
  font-weight: 600;
  color: var(--color-text-dark);
  margin-bottom: var(--spacing-sm);
}

.metadata-type-description {
  font-size: 0.875rem;
  color: var(--color-text-light);
}

.metadata-type-description code {
  font-size: 0.75rem;
  background: white;
  padding: 0.125rem 0.375rem;
  border-radius: var(--radius-sm);
}

/* ==================== STYLED BOX SYSTEM ==================== */
.styled-box {
  padding: 1.25rem;
  border-radius: var(--radius-lg);
  margin: var(--spacing-xl) 0;
  border: 1px solid transparent;
  transition: transform 0.2s, box-shadow 0.2s;
}

.styled-box.interactive:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.styled-box-title {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  font-weight: 600;
  font-size: 1rem;
  margin-bottom: var(--spacing-md);
}

.styled-box-title svg { width: 20px; height: 20px; }
.styled-box > *:last-child { margin-bottom: 0; }

/* Box Color Themes */
.box-green {
  background-color: var(--color-green-bg);
  border-color: #86efac;
  border: 1px solid #16a34a;
}

.box-green .styled-box-title { color: #166534; }
.box-green .styled-box-title svg { color: #16a34a; }

.box-rose {
  background-color: var(--color-rose-bg);
  border-color: var(--color-rose-border);
  border: 1px solid var(--color-rose);
}

.box-rose .styled-box-title { color: #9f1239; }
.box-rose .styled-box-title svg { color: var(--color-rose); }

/* ==================== IMAGE MODAL ==================== */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background-color: rgba(15, 23, 42, 0.9);
  backdrop-filter: blur(5px);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  padding: var(--spacing-2xl);
}

.modal-backdrop.active {
  opacity: 1;
  visibility: visible;
}

.modal-content-wrapper {
  position: relative;
  max-width: 100%;
  max-height: 100%;
}

.modal-image {
  max-width: 100%;
  max-height: 90vh;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xl);
  transform: scale(0.95);
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.modal-backdrop.active .modal-image { transform: scale(1); }

.modal-close {
  position: absolute;
  top: 20px;
  right: 20px;
  background: rgba(255, 255, 255, 0.1);
  border: none;
  border-radius: 50%;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: white;
  transition: background 0.2s;
  z-index: 10000;
}

.modal-close:hover { background: rgba(255, 255, 255, 0.25); }
.modal-close svg { width: 24px; height: 24px; }

.subsection img,
.step-text img {
  cursor: zoom-in;
  transition: transform 0.2s;
}

.subsection img:hover,
.step-text img:hover { opacity: 0.9; }

/* ==================== ZOOM HINT ==================== */
.zoom-hint {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  margin-top: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
  font-size: 0.75rem;
  color: var(--color-text-light);
  font-weight: 500;
  user-select: none;
}

.zoom-hint::before {
  content: '';
  display: block;
  width: 14px;
  height: 14px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Ccircle cx='11' cy='11' r='8'%3E%3C/circle%3E%3Cline x1='21' y1='21' x2='16.65' y2='16.65'%3E%3C/line%3E%3Cline x1='11' y1='8' x2='11' y2='14'%3E%3C/line%3E%3Cline x1='8' y1='11' x2='14' y2='11'%3E%3C/line%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
}

/* ==================== TERMINOLOGY SECTION ==================== */
.terminology-list {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-top: var(--spacing-lg);
}

.term-item {
  display: flex;
  border-bottom: 1px solid var(--color-border);
  background: white;
}

.term-item:last-child { border-bottom: none; }
.term-item:nth-child(even) { background: var(--color-bg); }

.term-name {
  flex: 0 0 200px;
  padding: var(--spacing-lg);
  font-weight: 600;
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  border-right: 1px solid var(--color-border);
}

.term-name svg {
  width: 16px;
  height: 16px;
  color: var(--color-text-light);
}

.term-def {
  flex: 1;
  padding: var(--spacing-lg);
  font-size: 0.9375rem;
  color: #475569;
  line-height: 1.5;
}

/* ==================== FOOTER ==================== */
.footer {
  background: #0f172a;
  color: #94a3b8;
  padding: 3rem 0;
}

.footer-container {
  max-width: 1152px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-xl);
}

.footer-brand { text-align: center; }

.footer-brand-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  justify-content: center;
  margin-bottom: var(--spacing-sm);
}

.footer-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.footer-icon svg {
  width: 20px;
  height: 20px;
  color: white;
}

.footer-brand-name {
  color: white;
  font-weight: 600;
  font-size: 1.125rem;
}

.footer-links {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
  font-size: 0.875rem;
}

.footer-link {
  color: #94a3b8;
  text-decoration: none;
  transition: color 0.2s;
}

.footer-link:hover { color: white; }

/* ==================== RESPONSIVE ==================== */
@media (min-width: 640px) {
  .header-subtitle { display: block; }
}

@media (min-width: 768px) {
  .header-logo { height: 2.5rem; }
  .header-title { font-size: 1.25rem; }
  .mobile-menu-btn { display: none; }
  .desktop-nav { display: flex; }
  .mobile-nav { display: none !important; }
  .main-content { padding: 3rem var(--spacing-lg); }
  .hero-title { font-size: 2.25rem; }
  .section-content { padding: 2.5rem; }
  .footer-content { flex-direction: row; }
  .footer-brand { text-align: left; }
  .footer-brand-header { justify-content: flex-start; }
}

@media (max-width: 767px) {
  .sharing-grid,
  .metadata-types-grid { grid-template-columns: 1fr; }

  .term-item { flex-direction: column; }
  .term-name {
    flex: none;
    background: var(--color-bg-light);
    padding: var(--spacing-md) var(--spacing-lg);
    border-right: none;
    border-bottom: 1px solid var(--color-border);
    color: #0f172a;
  }
  .term-def { padding: var(--spacing-lg); }
}