/* ============================================================
   BKNS Wiki Data Portal — Design System
   Style: Premium Glassmorphism Dashboard
   WCAG 2.2 AA Compliant
   ============================================================ */

/* === DESIGN TOKENS === */
:root {
  /* Primary Palette */
  --color-primary-50: #ecfeff;
  --color-primary-100: #cffafe;
  --color-primary-200: #a5f3fc;
  --color-primary-300: #67e8f9;
  --color-primary-400: #22d3ee;
  --color-primary-500: #06b6d4;
  --color-primary-600: #0891b2;
  --color-primary-700: #0e7490;
  --color-primary-800: #155e75;
  --color-primary-900: #164e63;

  /* Accent / Success */
  --color-accent: #10b981;
  --color-accent-hover: #059669;
  --color-success: #22c55e;
  --color-success-bg: rgba(34, 197, 94, 0.1);

  /* Warning / Error */
  --color-warning: #f59e0b;
  --color-warning-bg: rgba(245, 158, 11, 0.1);
  --color-error: #ef4444;
  --color-error-bg: rgba(239, 68, 68, 0.1);
  --color-info: #3b82f6;
  --color-info-bg: rgba(59, 130, 246, 0.1);

  /* Neutrals (Dark Theme) */
  --color-bg-deep: #030712;
  --color-bg: #0a1628;
  --color-bg-elevated: #111d33;
  --color-bg-card: rgba(17, 29, 51, 0.7);
  --color-bg-card-hover: rgba(17, 29, 51, 0.9);
  --color-bg-input: rgba(6, 12, 24, 0.6);
  --color-border: rgba(34, 211, 238, 0.15);
  --color-border-hover: rgba(34, 211, 238, 0.3);
  --color-border-focus: rgba(34, 211, 238, 0.6);
  --color-text: #f1f5f9;
  --color-text-secondary: #94a3b8;
  --color-text-muted: #64748b;
  --color-text-inverse: #0f172a;

  /* Glass */
  --glass-bg: rgba(17, 29, 51, 0.5);
  --glass-border: rgba(34, 211, 238, 0.12);
  --glass-blur: blur(16px);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;

  /* Typography */
  --font-heading: 'Space Grotesk', sans-serif;
  --font-body: 'DM Sans', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;

  --leading-tight: 1.25;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;

  /* Effects */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.25);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.3);
  --shadow-xl: 0 20px 50px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 20px rgba(34, 211, 238, 0.15);
  --shadow-glow-strong: 0 0 40px rgba(34, 211, 238, 0.25);

  /* Animation */
  --duration-micro: 100ms;
  --duration-fast: 150ms;
  --duration-normal: 250ms;
  --duration-slow: 400ms;
  --ease-enter: cubic-bezier(0, 0, 0.2, 1);
  --ease-exit: cubic-bezier(0.4, 0, 1, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-text);
  background: var(--color-bg-deep);
  min-height: 100dvh;
  overflow-x: hidden;
}

/* Animated background gradient */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(6, 182, 212, 0.08) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 20%, rgba(16, 185, 129, 0.06) 0%, transparent 50%),
    radial-gradient(ellipse at 40% 80%, rgba(59, 130, 246, 0.05) 0%, transparent 50%);
  z-index: -1;
  animation: bgShift 20s ease-in-out infinite;
}

@keyframes bgShift {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

a { color: var(--color-primary-400); text-decoration: none; }
a:hover { color: var(--color-primary-300); }

img { max-width: 100%; display: block; }

/* === TYPOGRAPHY === */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: var(--leading-tight);
  color: var(--color-text);
}

h1 { font-size: var(--text-4xl); }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-2xl); }

/* === BUTTONS === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  line-height: 1;
  border: 1px solid transparent;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-smooth);
  min-height: 44px;
  min-width: 44px;
  white-space: nowrap;
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

.btn:focus-visible {
  outline: 2px solid var(--color-primary-400);
  outline-offset: 2px;
}

.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary-500), var(--color-primary-600));
  color: white;
  box-shadow: 0 4px 15px rgba(6, 182, 212, 0.3);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--color-primary-400), var(--color-primary-500));
  box-shadow: 0 6px 20px rgba(6, 182, 212, 0.4);
  transform: translateY(-1px);
}

.btn-success {
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-hover));
  color: white;
  box-shadow: 0 4px 15px rgba(16, 185, 129, 0.3);
}

.btn-success:hover {
  box-shadow: 0 6px 20px rgba(16, 185, 129, 0.4);
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
}

.btn-ghost:hover {
  background: var(--glass-bg);
  color: var(--color-text);
  border-color: var(--color-border-hover);
}

.btn-danger {
  background: linear-gradient(135deg, var(--color-error), #dc2626);
  color: white;
}

.btn-icon {
  padding: var(--space-2);
  min-width: 44px;
  min-height: 44px;
}

.btn .spinner {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

.btn[disabled] {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

/* === CARDS (Glassmorphism) === */
.card {
  background: var(--color-bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  box-shadow: var(--glass-shadow);
  transition: all var(--duration-normal) var(--ease-smooth);
}

.card:hover {
  border-color: var(--color-border-hover);
  box-shadow: var(--glass-shadow), var(--shadow-glow);
}

/* === INPUTS === */
.input-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.input-group label {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
}

.input {
  padding: var(--space-3) var(--space-4);
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background: var(--color-bg-input);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: all var(--duration-fast) var(--ease-smooth);
  min-height: 44px;
}

.input:focus {
  outline: none;
  border-color: var(--color-border-focus);
  box-shadow: 0 0 0 3px rgba(34, 211, 238, 0.1);
}

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

/* === LOGIN PAGE === */
.login-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100dvh;
  padding: var(--space-4);
}

.login-card {
  width: 100%;
  max-width: 420px;
  text-align: center;
}

.login-card .logo {
  font-size: var(--text-3xl);
  font-family: var(--font-heading);
  font-weight: 700;
  background: linear-gradient(135deg, var(--color-primary-400), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-2);
}

.login-card .subtitle {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  margin-bottom: var(--space-8);
}

.login-card .input-group {
  margin-bottom: var(--space-4);
  text-align: left;
}

.login-card .btn {
  width: 100%;
  margin-top: var(--space-4);
}

.login-error {
  background: var(--color-error-bg);
  color: var(--color-error);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  margin-bottom: var(--space-4);
  display: none;
  border: 1px solid rgba(239, 68, 68, 0.2);
}

.login-error.visible { display: block; }

/* === DASHBOARD LAYOUT === */
.app {
  display: none;
  min-height: 100dvh;
}

.app.active { display: block; }

.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 22, 40, 0.85);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--glass-border);
  padding: var(--space-4) var(--space-6);
}

.header-inner {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.header .brand {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.header .brand-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--color-primary-500), var(--color-accent));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-lg);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.main {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--space-6);
  display: grid;
  gap: var(--space-6);
}

/* Two-column on desktop */
@media (min-width: 1024px) {
  .main {
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto auto 1fr;
  }
  .stats-bar { grid-column: 1 / -1; }
  .upload-section { grid-column: 1; grid-row: 2 / 4; }
  .pipeline-section { grid-column: 2; grid-row: 2; }
  .files-section { grid-column: 2; grid-row: 3; }
}

@media (max-width: 1023px) {
  .main {
    grid-template-columns: 1fr;
  }
}

/* === STATS BAR === */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-4);
}

.stat-card {
  padding: var(--space-5);
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.stat-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-xl);
  flex-shrink: 0;
}

.stat-icon.cyan { background: rgba(6, 182, 212, 0.15); color: var(--color-primary-400); }
.stat-icon.green { background: rgba(16, 185, 129, 0.15); color: var(--color-accent); }
.stat-icon.blue { background: rgba(59, 130, 246, 0.15); color: var(--color-info); }
.stat-icon.amber { background: rgba(245, 158, 11, 0.15); color: var(--color-warning); }

.stat-content { flex: 1; min-width: 0; }

.stat-value {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: 700;
}

.stat-label {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

/* === UPLOAD ZONE === */
.upload-zone {
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-12) var(--space-6);
  text-align: center;
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-smooth);
  position: relative;
  overflow: hidden;
}

.upload-zone::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at center, rgba(6, 182, 212, 0.05), transparent 70%);
  opacity: 0;
  transition: opacity var(--duration-normal) var(--ease-smooth);
}

.upload-zone:hover,
.upload-zone.drag-over {
  border-color: var(--color-primary-400);
  background: rgba(6, 182, 212, 0.03);
  box-shadow: var(--shadow-glow);
}

.upload-zone:hover::before,
.upload-zone.drag-over::before {
  opacity: 1;
}

.upload-zone.drag-over {
  transform: scale(1.01);
  border-style: solid;
}

.upload-icon {
  font-size: 3rem;
  margin-bottom: var(--space-4);
  opacity: 0.7;
  transition: opacity var(--duration-normal);
}

.upload-zone:hover .upload-icon { opacity: 1; }

.upload-title {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  margin-bottom: var(--space-2);
}

.upload-desc {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  margin-bottom: var(--space-4);
}

.upload-formats {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-2);
}

.format-tag {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  background: rgba(6, 182, 212, 0.1);
  border: 1px solid rgba(6, 182, 212, 0.2);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-primary-300);
  font-family: var(--font-mono);
}

/* === FILE QUEUE === */
.file-queue {
  margin-top: var(--space-4);
}

.file-queue-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--color-bg-elevated);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-2);
  animation: fadeSlideUp var(--duration-normal) var(--ease-enter);
}

.file-queue-item .file-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-sm);
  font-weight: 700;
  flex-shrink: 0;
}

.file-icon.pdf { background: rgba(239, 68, 68, 0.15); color: var(--color-error); }
.file-icon.doc { background: rgba(59, 130, 246, 0.15); color: var(--color-info); }
.file-icon.xls { background: rgba(34, 197, 94, 0.15); color: var(--color-success); }
.file-icon.md  { background: rgba(168, 85, 247, 0.15); color: #a855f7; }
.file-icon.txt { background: rgba(148, 163, 184, 0.15); color: var(--color-text-secondary); }
.file-icon.img { background: rgba(245, 158, 11, 0.15); color: var(--color-warning); }

.file-queue-item .file-info {
  flex: 1;
  min-width: 0;
}

.file-queue-item .file-name {
  font-size: var(--text-sm);
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.file-queue-item .file-size {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.file-queue-item .progress-bar {
  width: 100%;
  height: 4px;
  background: var(--color-bg-deep);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-top: var(--space-1);
}

.file-queue-item .progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary-500), var(--color-accent));
  border-radius: var(--radius-full);
  transition: width var(--duration-slow) var(--ease-smooth);
  width: 0%;
}

.file-queue-item .remove-btn {
  background: none;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  padding: var(--space-1);
  border-radius: var(--radius-sm);
  min-width: 28px;
  min-height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--duration-fast);
}

.file-queue-item .remove-btn:hover {
  color: var(--color-error);
  background: var(--color-error-bg);
}

/* Upload actions */
.upload-actions {
  display: flex;
  gap: var(--space-3);
  margin-top: var(--space-4);
  flex-wrap: wrap;
}

.upload-actions .btn {
  flex: 1;
  min-width: 140px;
}

/* === PIPELINE SECTION === */
.pipeline-status-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.pipeline-status-badge.idle {
  background: rgba(100, 116, 139, 0.15);
  color: var(--color-text-secondary);
}

.pipeline-status-badge.running {
  background: rgba(34, 211, 238, 0.15);
  color: var(--color-primary-400);
}

.pipeline-status-badge.success {
  background: rgba(34, 197, 94, 0.15);
  color: var(--color-success);
}

.pipeline-status-badge.failed {
  background: rgba(239, 68, 68, 0.15);
  color: var(--color-error);
}

.pipeline-status-badge .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: currentColor;
}

.pipeline-status-badge.running .dot {
  animation: pulse 1.5s ease-in-out infinite;
}

.pipeline-actions {
  display: flex;
  gap: var(--space-3);
  margin-top: var(--space-4);
  flex-wrap: wrap;
}

.pipeline-info {
  margin-top: var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.pipeline-info dt {
  font-weight: 500;
  color: var(--color-text-secondary);
}

.pipeline-info dd {
  margin-bottom: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
}

/* === FILE BROWSER === */
.files-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.files-tabs {
  display: flex;
  gap: var(--space-1);
  background: var(--color-bg-input);
  padding: var(--space-1);
  border-radius: var(--radius-lg);
}

.files-tab {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  border: none;
  background: transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--duration-fast);
  min-height: 36px;
  font-family: var(--font-body);
}

.files-tab:hover { color: var(--color-text); }

.files-tab.active {
  background: var(--color-bg-elevated);
  color: var(--color-primary-400);
  box-shadow: var(--shadow-sm);
}

.files-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

.files-table th {
  text-align: left;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--color-border);
}

.files-table td {
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid rgba(34, 211, 238, 0.06);
  vertical-align: middle;
}

.files-table tr {
  transition: background var(--duration-fast);
}

.files-table tbody tr:hover {
  background: rgba(6, 182, 212, 0.03);
}

.files-table .file-name-cell {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.files-table .file-name-text {
  max-width: 200px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.files-table .file-date {
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
}

.files-table .file-size-cell {
  color: var(--color-text-secondary);
  font-family: var(--font-mono);
}

.file-actions-cell {
  display: flex;
  gap: var(--space-1);
}

.files-empty {
  padding: var(--space-12);
  text-align: center;
  color: var(--color-text-muted);
}

/* Pagination */
.files-pagination {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

/* === TOAST NOTIFICATIONS === */
.toast-container {
  position: fixed;
  top: var(--space-4);
  right: var(--space-4);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  max-width: 420px;
  width: 100%;
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-4);
  background: var(--color-bg-elevated);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  animation: toastEnter var(--duration-normal) var(--ease-spring);
  pointer-events: auto;
}

.toast.removing {
  animation: toastExit var(--duration-fast) var(--ease-exit) forwards;
}

.toast-icon { font-size: var(--text-xl); flex-shrink: 0; }
.toast.success .toast-icon { color: var(--color-success); }
.toast.error .toast-icon { color: var(--color-error); }
.toast.warning .toast-icon { color: var(--color-warning); }
.toast.info .toast-icon { color: var(--color-info); }

.toast-content { flex: 1; }
.toast-title { font-weight: 600; font-size: var(--text-sm); }
.toast-message { font-size: var(--text-xs); color: var(--color-text-muted); margin-top: var(--space-1); }

.toast-close {
  background: none;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  padding: var(--space-1);
  font-size: var(--text-lg);
  line-height: 1;
  min-width: 28px;
  min-height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  transition: all var(--duration-fast);
}

.toast-close:hover {
  color: var(--color-text);
  background: rgba(255,255,255,0.05);
}

/* === MODAL / CONFIRMATION DIALOG === */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(3, 7, 18, 0.8);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 500;
  padding: var(--space-4);
  opacity: 0;
  visibility: hidden;
  transition: all var(--duration-normal);
}

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

.modal {
  width: 100%;
  max-width: 480px;
  transform: scale(0.95) translateY(10px);
  transition: transform var(--duration-normal) var(--ease-spring);
}

.modal-overlay.active .modal {
  transform: scale(1) translateY(0);
}

.modal h3 {
  margin-bottom: var(--space-3);
}

.modal-message {
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  margin-bottom: var(--space-6);
}

.modal-actions {
  display: flex;
  gap: var(--space-3);
  justify-content: flex-end;
}

/* === SECTION HEADINGS === */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-4);
}

.section-title {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* === ANIMATIONS === */
@keyframes fadeSlideUp {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes toastEnter {
  from { opacity: 0; transform: translateX(100%); }
  to   { opacity: 1; transform: translateX(0); }
}

@keyframes toastExit {
  from { opacity: 1; transform: translateX(0); }
  to   { opacity: 0; transform: translateX(100%); }
}

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

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

@keyframes shimmer {
  0%   { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

.skeleton {
  background: linear-gradient(90deg,
    var(--color-bg-elevated) 25%,
    rgba(34, 211, 238, 0.05) 50%,
    var(--color-bg-elevated) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-md);
}

.fade-in {
  animation: fadeSlideUp var(--duration-normal) var(--ease-enter);
}

/* === SCROLLBAR === */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--color-border-hover);
}

/* === RESPONSIVE === */
@media (max-width: 640px) {
  .header-inner { padding: var(--space-3); }
  .main { padding: var(--space-4); }
  .card { padding: var(--space-4); }
  .upload-zone { padding: var(--space-8) var(--space-4); }
  .stats-bar { grid-template-columns: repeat(2, 1fr); }
  .stat-card { padding: var(--space-3); }
  .stat-icon { width: 40px; height: 40px; font-size: var(--text-lg); }
  .stat-value { font-size: var(--text-xl); }
  .files-table th:nth-child(3),
  .files-table td:nth-child(3) { display: none; }
}

/* === ACCESSIBILITY === */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
  body::before { animation: none; }
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Skip to content */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-primary-500);
  color: white;
  padding: var(--space-2) var(--space-4);
  z-index: 999;
  transition: top var(--duration-fast);
}

.skip-link:focus {
  top: 0;
}

/* Focus visible polyfill */
:focus:not(:focus-visible) {
  outline: none;
}

:focus-visible {
  outline: 2px solid var(--color-primary-400);
  outline-offset: 2px;
}

/* ============================================================
   MAIN NAVIGATION TABS
   ============================================================ */
.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav-tab {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--color-text-secondary);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

.nav-tab:hover {
  color: var(--color-text);
  background: rgba(34, 211, 238, 0.08);
  border-color: var(--color-border);
}

.nav-tab.active {
  color: var(--color-primary-400);
  background: rgba(34, 211, 238, 0.12);
  border-color: var(--color-border-hover);
}

.nav-tab svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

/* ============================================================
   WIKI EDITOR LAYOUT
   ============================================================ */
.wiki-page {
  display: flex;
  height: calc(100vh - 64px);
  overflow: hidden;
  gap: 0;
}

/* ============================================================
   WIKI SIDEBAR
   ============================================================ */
.wiki-sidebar {
  width: 240px;
  flex-shrink: 0;
  background: var(--color-bg-elevated);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.wiki-sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-4) var(--space-3);
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
}

.wiki-sidebar-title {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  margin: 0;
}

.wiki-sidebar-title svg {
  width: 16px;
  height: 16px;
  color: var(--color-primary-400);
}

.wiki-page-list {
  list-style: none;
  padding: var(--space-2) 0;
  margin: 0;
  overflow-y: auto;
  flex: 1;
}

.wiki-page-list-empty {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-6);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.wiki-page-item {
  padding: var(--space-3) var(--space-4);
  cursor: pointer;
  border-left: 3px solid transparent;
  transition: all 0.15s;
  outline: none;
}

.wiki-page-item:hover {
  background: rgba(34, 211, 238, 0.06);
  border-left-color: var(--color-border-hover);
}

.wiki-page-item.active {
  background: rgba(34, 211, 238, 0.1);
  border-left-color: var(--color-primary-400);
}

.wiki-page-item:focus-visible {
  background: rgba(34, 211, 238, 0.08);
  outline: 1px solid var(--color-primary-400);
  outline-offset: -2px;
}

.wiki-page-missing {
  opacity: 0.45;
  cursor: not-allowed;
}

.wiki-page-item-name {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: var(--space-1);
}

.wiki-page-item-icon {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
  color: var(--color-text-muted);
}

.wiki-page-item.active .wiki-page-item-icon {
  color: var(--color-primary-400);
}

.wiki-page-item-meta {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  margin-bottom: var(--space-1);
}

.wiki-page-item-date {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

/* ============================================================
   WIKI BADGES
   ============================================================ */
.wiki-badge {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  padding: 2px var(--space-2);
  border-radius: var(--radius-full);
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1.4;
}

.wiki-badge svg {
  width: 10px;
  height: 10px;
}

.badge-success {
  background: var(--color-success-bg);
  color: var(--color-success);
  border: 1px solid rgba(34, 197, 94, 0.2);
}

.badge-warning {
  background: var(--color-warning-bg);
  color: var(--color-warning);
  border: 1px solid rgba(245, 158, 11, 0.2);
}

.badge-error {
  background: var(--color-error-bg);
  color: var(--color-error);
  border: 1px solid rgba(239, 68, 68, 0.2);
}

.badge-muted {
  background: rgba(100, 116, 139, 0.15);
  color: var(--color-text-secondary);
  border: 1px solid rgba(100, 116, 139, 0.2);
}

/* ============================================================
   WIKI EDITOR MAIN
   ============================================================ */
.wiki-editor-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--color-bg);
}

.wiki-empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  gap: var(--space-4);
  color: var(--color-text-muted);
  text-align: center;
  padding: var(--space-12);
}

.wiki-empty-icon {
  width: 72px;
  height: 72px;
  border-radius: var(--radius-2xl);
  background: rgba(34, 211, 238, 0.08);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary-500);
}

.wiki-empty-icon svg {
  width: 36px;
  height: 36px;
}

.wiki-empty-state h3 {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  color: var(--color-text-secondary);
  margin: 0;
}

.wiki-empty-state p {
  font-size: var(--text-sm);
  max-width: 320px;
  line-height: var(--leading-relaxed);
  margin: 0;
}

.wiki-editor-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* ============================================================
   WIKI EDITOR HEADER
   ============================================================ */
.wiki-editor-header {
  flex-shrink: 0;
  padding: var(--space-3) var(--space-5);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg-elevated);
}

.wiki-editor-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-3);
  flex-wrap: wrap;
  gap: var(--space-2);
}

.wiki-breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-sm);
}

.wiki-breadcrumb-root,
.wiki-breadcrumb-file {
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
}

.wiki-breadcrumb-current {
  color: var(--color-primary-400);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 600;
}

.wiki-breadcrumb-sep {
  width: 12px;
  height: 12px;
  color: var(--color-text-muted);
  flex-shrink: 0;
}

.wiki-editor-badges {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.wiki-toolbar {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.wiki-view-toggle {
  display: flex;
  align-items: center;
  background: var(--color-bg-input);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.wiki-view-btn {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  background: transparent;
  border: none;
  border-right: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
}

.wiki-view-btn:last-child { border-right: none; }

.wiki-view-btn svg {
  width: 13px;
  height: 13px;
}

.wiki-view-btn:hover {
  background: rgba(34, 211, 238, 0.08);
  color: var(--color-text);
}

.wiki-view-btn.active {
  background: rgba(34, 211, 238, 0.15);
  color: var(--color-primary-400);
}

.wiki-toolbar-sep {
  width: 1px;
  height: 20px;
  background: var(--color-border);
  margin: 0 var(--space-1);
}

.wiki-word-count,
.wiki-char-count {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  white-space: nowrap;
}

.wiki-save-status {
  font-size: var(--text-xs);
  font-weight: 500;
  min-width: 80px;
  transition: color 0.3s;
}

.wiki-save-status.dirty { color: var(--color-warning); }
.wiki-save-status.saved { color: var(--color-success); }
.wiki-save-status.saving { color: var(--color-primary-400); }

/* ============================================================
   WIKI SPLIT PANE
   ============================================================ */
.wiki-split-pane {
  flex: 1;
  display: flex;
  overflow: hidden;
  min-height: 0;
}

.wiki-edit-pane {
  flex: 0 0 50%;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border-right: 1px solid var(--color-border);
  min-width: 200px;
}

.wiki-preview-pane {
  flex: 0 0 49.5%;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 200px;
}

.wiki-pane-label {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: var(--color-bg-elevated);
  border-bottom: 1px solid var(--color-border);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  flex-shrink: 0;
}

.wiki-pane-label svg { width: 12px; height: 12px; }

.wiki-textarea {
  flex: 1;
  width: 100%;
  background: var(--color-bg-deep);
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.7;
  padding: var(--space-5);
  border: none;
  resize: none;
  outline: none;
  overflow-y: auto;
  tab-size: 2;
  white-space: pre-wrap;
  word-break: break-word;
}

.wiki-textarea::placeholder { color: var(--color-text-muted); }
.wiki-textarea:disabled { opacity: 0.5; cursor: not-allowed; }

.wiki-preview-content {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-5) var(--space-6);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: var(--leading-relaxed);
  font-family: var(--font-body);
  font-size: var(--text-sm);
}

/* Markdown rendered styles */
.wiki-preview-content h1,
.wiki-preview-content h2,
.wiki-preview-content h3,
.wiki-preview-content h4 {
  font-family: var(--font-heading);
  color: var(--color-text);
  margin-top: var(--space-8);
  margin-bottom: var(--space-3);
  line-height: var(--leading-tight);
}

.wiki-preview-content h1 {
  font-size: var(--text-2xl);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: var(--space-2);
}
.wiki-preview-content h2 { font-size: var(--text-xl); color: var(--color-primary-300); }
.wiki-preview-content h3 { font-size: var(--text-lg); }
.wiki-preview-content h4 { font-size: var(--text-base); color: var(--color-text-secondary); }

.wiki-preview-content p {
  margin: 0 0 var(--space-4);
  color: var(--color-text-secondary);
}

.wiki-preview-content a {
  color: var(--color-primary-400);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.wiki-preview-content strong { color: var(--color-text); font-weight: 600; }
.wiki-preview-content em { color: var(--color-text-secondary); }

.wiki-preview-content code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: rgba(34, 211, 238, 0.08);
  color: var(--color-primary-300);
  padding: 1px 6px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(34, 211, 238, 0.12);
}

.wiki-preview-content pre {
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  overflow-x: auto;
  margin-bottom: var(--space-4);
}

.wiki-preview-content pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: var(--text-sm);
  color: var(--color-text);
}

.wiki-preview-content blockquote {
  border-left: 3px solid var(--color-primary-500);
  margin: var(--space-4) 0;
  padding: var(--space-2) var(--space-4);
  background: rgba(34, 211, 238, 0.04);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  color: var(--color-text-secondary);
}

.wiki-preview-content ul,
.wiki-preview-content ol {
  padding-left: var(--space-6);
  margin-bottom: var(--space-4);
  color: var(--color-text-secondary);
}

.wiki-preview-content li { margin-bottom: var(--space-1); }

.wiki-preview-content hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-6) 0;
}

.wiki-preview-content table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
  margin-bottom: var(--space-6);
  overflow-x: auto;
  display: block;
}

.wiki-preview-content thead {
  background: rgba(34, 211, 238, 0.08);
}

.wiki-preview-content th {
  padding: var(--space-2) var(--space-3);
  text-align: left;
  font-weight: 600;
  color: var(--color-primary-300);
  border-bottom: 2px solid var(--color-border-hover);
  white-space: nowrap;
}

.wiki-preview-content td {
  padding: var(--space-2) var(--space-3);
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-secondary);
}

.wiki-preview-content tr:hover td {
  background: rgba(34, 211, 238, 0.03);
}

.wiki-preview-loading,
.wiki-preview-error {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  padding: var(--space-12);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.wiki-preview-error { color: var(--color-error); }

.wiki-resize-handle {
  flex-shrink: 0;
  width: 5px;
  background: var(--color-border);
  cursor: col-resize;
  transition: background 0.15s;
}

.wiki-resize-handle:hover,
.wiki-resize-handle:active {
  background: var(--color-primary-500);
}

/* ============================================================
   WIKI BACKUPS DRAWER
   ============================================================ */
.wiki-backups-drawer {
  flex-shrink: 0;
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-elevated);
  max-height: 220px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.wiki-backups-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
}

.wiki-backups-header h4 {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-secondary);
  margin: 0;
}

.wiki-backups-header svg { width: 14px; height: 14px; }

.wiki-backups-list {
  list-style: none;
  padding: var(--space-2) 0;
  margin: 0;
  overflow-y: auto;
}

.wiki-backups-empty {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-5);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.wiki-backup-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-5);
  transition: background 0.15s;
}

.wiki-backup-item:hover { background: rgba(34, 211, 238, 0.04); }

.wiki-backup-icon {
  width: 16px;
  height: 16px;
  color: var(--color-text-muted);
  flex-shrink: 0;
}

.wiki-backup-info { flex: 1; min-width: 0; }

.wiki-backup-name {
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  color: var(--color-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.wiki-backup-meta {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

/* Spin animation */
@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* Small button size */
.btn-sm {
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
}

.btn-sm svg {
  width: 13px;
  height: 13px;
}