/* ============================================================
   Theme B — 清辉科技 Crystal Tech
   AI共创工坊 Design System v5.0
   ============================================================ */

/* --- Design Tokens --- */
:root {
  /* Primary */
  --b-primary: #5b6af0;
  --b-primary-light: #f0f1ff;
  --b-primary-hover: #4a5ae0;
  --b-primary-dark: #3b4cd0;
  --b-primary-subtle: rgba(91,106,240,0.06);

  /* Secondary */
  --b-secondary: #00b894;
  --b-secondary-light: #e6faf5;
  --b-secondary-hover: #00a381;

  /* Neutrals */
  --b-bg: #f8f9fc;
  --b-surface: #ffffff;
  --b-border: #edf0f5;
  --b-border-hover: #d1d5db;
  --b-text: #111827;
  --b-text-secondary: #6b7280;
  --b-text-muted: #9ca3af;
  --b-text-inverse: #ffffff;

  /* Semantic */
  --b-success: #10b981;
  --b-success-light: #d1fae5;
  --b-success-text: #065f46;
  --b-warning: #f59e0b;
  --b-warning-light: #fef3c7;
  --b-warning-text: #92400e;
  --b-danger: #ef4444;
  --b-danger-light: #fee2e2;
  --b-danger-text: #991b1b;
  --b-info: #3b82f6;
  --b-info-light: #dbeafe;
  --b-info-text: #1e40af;

  /* Radius */
  --b-radius-sm: 6px;
  --b-radius: 10px;
  --b-radius-lg: 14px;
  --b-radius-xl: 18px;
  --b-radius-full: 9999px;

  /* Shadows */
  --b-shadow-xs: 0 1px 2px rgba(0,0,0,0.03);
  --b-shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
  --b-shadow: 0 2px 8px rgba(0,0,0,0.06);
  --b-shadow-md: 0 4px 16px rgba(0,0,0,0.08);
  --b-shadow-lg: 0 8px 32px rgba(0,0,0,0.1);

  /* Transitions */
  --b-transition: 0.2s ease;
  --b-transition-slow: 0.3s ease;

  /* Typography */
  --b-font: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --b-font-mono: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;

  /* Layout */
  --b-sidebar-width: 220px;
  --b-topbar-height: 56px;
}

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

body {
  margin: 0;
  font-family: var(--b-font);
  background: var(--b-bg);
  color: var(--b-text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.5;
}

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

/* Scrollbar */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--b-border-hover); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--b-text-muted); }

::selection { background: var(--b-primary-light); color: var(--b-primary); }

/* ============================================================
   TOPBAR
   ============================================================ */
.topbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--b-topbar-height);
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(12px) saturate(180%);
  -webkit-backdrop-filter: blur(12px) saturate(180%);
  border-bottom: 1px solid var(--b-border);
  display: flex;
  align-items: center;
  padding: 0 24px;
  z-index: 100;
  gap: 16px;
}

.topbar .logo {
  font-size: 16px;
  font-weight: 700;
  color: var(--b-text);
  display: flex;
  align-items: center;
  gap: 8px;
  letter-spacing: 0.3px;
}

.topbar .logo-svg { width: 22px; height: 22px; }

.topbar .breadcrumb {
  font-size: 12px;
  color: var(--b-text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
}

.topbar .breadcrumb span { color: var(--b-text-secondary); }

.topbar .topbar-right {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 14px;
}

.topbar .user-info {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--b-text);
  font-weight: 500;
}

.topbar .user-avatar {
  width: 30px; height: 30px;
  border-radius: var(--b-radius-sm);
  background: linear-gradient(135deg, var(--b-primary), var(--b-secondary));
  display: flex; align-items: center; justify-content: center;
  font-size: 11px; font-weight: 700;
  color: #fff;
}

.topbar .btn-logout {
  padding: 5px 12px;
  border-radius: var(--b-radius-sm);
  border: 1px solid var(--b-border);
  background: var(--b-surface);
  color: var(--b-text-secondary);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--b-transition);
  font-family: var(--b-font);
}

.topbar .btn-logout:hover {
  border-color: var(--b-danger);
  color: var(--b-danger);
  background: var(--b-danger-light);
}

/* ============================================================
   SIDEBAR
   ============================================================ */
.sidebar {
  position: fixed;
  top: var(--b-topbar-height);
  left: 0;
  bottom: 0;
  width: var(--b-sidebar-width);
  background: var(--b-surface);
  border-right: 1px solid var(--b-border);
  padding: 16px 0;
  display: flex;
  flex-direction: column;
  z-index: 50;
  overflow-y: auto;
}

.sidebar .nav-section {
  flex: 1;
  padding: 0 10px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.sidebar .nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border-radius: var(--b-radius);
  font-size: 13px;
  font-weight: 500;
  color: var(--b-text-secondary);
  cursor: pointer;
  transition: all var(--b-transition);
  text-decoration: none;
  letter-spacing: 0.2px;
  border: none;
  background: none;
  width: 100%;
  text-align: left;
  font-family: var(--b-font);
}

.sidebar .nav-item:hover {
  color: var(--b-text);
  background: var(--b-bg);
}

.sidebar .nav-item.active {
  color: var(--b-primary);
  background: var(--b-primary-light);
  font-weight: 600;
}

.sidebar .nav-item svg { width: 18px; height: 18px; flex-shrink: 0; }

.sidebar .nav-item .nav-badge {
  margin-left: auto;
  font-size: 10px;
  padding: 2px 7px;
  border-radius: var(--b-radius-full);
  background: var(--b-primary-light);
  color: var(--b-primary);
  font-weight: 600;
}

.sidebar-footer {
  margin: 12px 10px 0;
  padding: 14px;
  background: var(--b-bg);
  border-radius: var(--b-radius-lg);
  border: 1px solid var(--b-border);
}

.sidebar-footer .upgrade-text {
  font-size: 12px;
  color: var(--b-text-secondary);
  margin-bottom: 8px;
  line-height: 1.4;
}

.sidebar-footer .upgrade-btn {
  width: 100%;
  padding: 7px 0;
  border-radius: var(--b-radius-sm);
  background: var(--b-primary);
  color: #fff;
  border: none;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--b-transition);
  font-family: var(--b-font);
  text-align: center;
}

.sidebar-footer .upgrade-btn:hover {
  background: var(--b-primary-hover);
  box-shadow: var(--b-shadow-sm);
}

/* ============================================================
   MAIN CONTENT AREA
   ============================================================ */
.main-content {
  margin-left: var(--b-sidebar-width);
  margin-top: var(--b-topbar-height);
  min-height: calc(100vh - var(--b-topbar-height));
  padding: 20px 28px 40px;
}

.page-header {
  margin-bottom: 20px;
}

.page-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--b-text);
  margin-bottom: 4px;
}

.page-subtitle {
  font-size: 13px;
  color: var(--b-text-muted);
}

/* ============================================================
   STAT CARDS
   ============================================================ */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 20px;
}

.stat-card {
  background: var(--b-surface);
  border: 1px solid var(--b-border);
  border-radius: var(--b-radius-lg);
  padding: 16px 18px;
  transition: all var(--b-transition);
}

.stat-card:hover {
  border-color: var(--b-border-hover);
  box-shadow: var(--b-shadow-sm);
  transform: translateY(-1px);
}

.stat-card .stat-icon {
  width: 34px; height: 34px;
  border-radius: var(--b-radius);
  background: var(--b-primary-light);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 10px;
}

.stat-card .stat-icon svg { width: 17px; height: 17px; color: var(--b-primary); }

.stat-card .stat-value {
  font-size: 22px;
  font-weight: 800;
  color: var(--b-text);
  letter-spacing: -0.3px;
}

.stat-card .stat-label {
  font-size: 12px;
  color: var(--b-text-muted);
  margin-top: 2px;
}

.stat-card .stat-trend {
  font-size: 11px;
  margin-top: 4px;
  font-weight: 600;
}

.stat-card .stat-trend.up { color: var(--b-success); }
.stat-card .stat-trend.down { color: var(--b-danger); }

/* ============================================================
   CARDS
   ============================================================ */
.card {
  background: var(--b-surface);
  border: 1px solid var(--b-border);
  border-radius: var(--b-radius-lg);
  padding: 18px;
  transition: all var(--b-transition);
}

.card:hover {
  border-color: var(--b-border-hover);
  box-shadow: var(--b-shadow-sm);
}

.card-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--b-text);
  margin-bottom: 6px;
}

.card-desc {
  font-size: 12px;
  color: var(--b-text-muted);
  line-height: 1.5;
}

/* ============================================================
   PROJECT CARD (共创工坊专用)
   ============================================================ */
.project-card {
  background: var(--b-surface);
  border: 1px solid var(--b-border);
  border-radius: var(--b-radius-lg);
  padding: 16px;
  transition: all var(--b-transition);
}

.project-card:hover {
  border-color: var(--b-border-hover);
  box-shadow: var(--b-shadow-sm);
}

.project-card .project-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--b-text);
  margin-bottom: 4px;
}

.project-card .project-desc {
  font-size: 12px;
  color: var(--b-text-muted);
  line-height: 1.5;
  margin-bottom: 10px;
}

.project-card .project-meta {
  display: flex;
  gap: 12px;
  align-items: center;
  font-size: 11px;
  color: var(--b-text-secondary);
  flex-wrap: wrap;
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 9px 18px;
  border-radius: var(--b-radius);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--b-transition);
  border: 1px solid transparent;
  font-family: var(--b-font);
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--b-primary);
  color: #fff;
  border-color: var(--b-primary);
}

.btn-primary:hover {
  background: var(--b-primary-hover);
  border-color: var(--b-primary-hover);
  box-shadow: 0 2px 8px rgba(91,106,240,0.25);
}

.btn-secondary {
  background: var(--b-surface);
  color: var(--b-text-secondary);
  border-color: var(--b-border);
}

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

.btn-success {
  background: var(--b-success);
  color: #fff;
  border-color: var(--b-success);
}

.btn-success:hover {
  background: #059669;
  box-shadow: 0 2px 8px rgba(16,185,129,0.25);
}

.btn-danger {
  background: var(--b-danger);
  color: #fff;
  border-color: var(--b-danger);
}

.btn-danger:hover {
  background: #dc2626;
  box-shadow: 0 2px 8px rgba(239,68,68,0.25);
}

.btn-warning {
  background: var(--b-warning);
  color: #fff;
  border-color: var(--b-warning);
}

.btn-warning:hover {
  background: #d97706;
}

.btn-outline {
  background: transparent;
  color: var(--b-primary);
  border-color: var(--b-primary);
}

.btn-outline:hover {
  background: var(--b-primary-light);
}

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

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

.btn-sm {
  padding: 5px 12px;
  font-size: 11px;
  border-radius: var(--b-radius-sm);
}

.btn-lg {
  padding: 12px 28px;
  font-size: 15px;
  border-radius: var(--b-radius-lg);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* ============================================================
   BADGES / TAGS
   ============================================================ */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: var(--b-radius-full);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.2px;
}

.badge-primary { background: var(--b-primary-light); color: var(--b-primary); }
.badge-success { background: var(--b-success-light); color: var(--b-success-text); }
.badge-warning { background: var(--b-warning-light); color: var(--b-warning-text); }
.badge-danger { background: var(--b-danger-light); color: var(--b-danger-text); }
.badge-info { background: var(--b-info-light); color: var(--b-info-text); }
.badge-neutral { background: var(--b-bg); color: var(--b-text-secondary); }

.tag {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: var(--b-radius-sm);
  font-size: 11px;
  font-weight: 600;
}

.tag-primary { background: var(--b-primary-light); color: var(--b-primary); }
.tag-success { background: var(--b-success-light); color: var(--b-success-text); }
.tag-warning { background: var(--b-warning-light); color: var(--b-warning-text); }
.tag-neutral { background: #f1f3f5; color: #868e96; }

/* ============================================================
   PROGRESS BAR
   ============================================================ */
.progress-bar {
  height: 5px;
  border-radius: 3px;
  background: var(--b-bg);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--b-primary), var(--b-secondary));
  transition: width 0.4s ease;
}

/* ============================================================
   TABS
   ============================================================ */
.tabs {
  display: flex;
  gap: 2px;
  background: var(--b-bg);
  border-radius: var(--b-radius);
  padding: 3px;
  width: fit-content;
  margin-bottom: 16px;
}

.tab {
  padding: 7px 16px;
  border-radius: 7px;
  font-size: 12px;
  font-weight: 600;
  color: var(--b-text-secondary);
  cursor: pointer;
  transition: all var(--b-transition);
  border: none;
  background: transparent;
  font-family: var(--b-font);
  white-space: nowrap;
}

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

.tab.active {
  background: var(--b-surface);
  color: var(--b-primary);
  box-shadow: var(--b-shadow-xs);
}

/* ============================================================
   TABLES
   ============================================================ */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.data-table th {
  text-align: left;
  padding: 10px 14px;
  background: var(--b-bg);
  color: var(--b-text-secondary);
  font-weight: 600;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-bottom: 1px solid var(--b-border);
}

.data-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--b-border);
  color: var(--b-text);
}

.data-table tr:hover td {
  background: var(--b-bg);
}

.data-table-wrap {
  background: var(--b-surface);
  border: 1px solid var(--b-border);
  border-radius: var(--b-radius-lg);
  overflow: hidden;
}

/* ============================================================
   FORMS
   ============================================================ */
.form-group {
  margin-bottom: 14px;
}

.form-label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--b-text);
  margin-bottom: 5px;
}

.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid var(--b-border);
  border-radius: var(--b-radius);
  font-size: 13px;
  color: var(--b-text);
  background: var(--b-surface);
  transition: all var(--b-transition);
  font-family: var(--b-font);
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--b-primary);
  box-shadow: 0 0 0 3px var(--b-primary-subtle);
}

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

.form-textarea { resize: vertical; min-height: 80px; }

/* ============================================================
   MODAL
   ============================================================ */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.modal {
  background: var(--b-surface);
  border-radius: var(--b-radius-xl);
  padding: 24px;
  width: 90%;
  max-width: 480px;
  box-shadow: var(--b-shadow-lg);
  max-height: 90vh;
  overflow-y: auto;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.modal-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--b-text);
}

.modal-close {
  width: 28px; height: 28px;
  border-radius: var(--b-radius-sm);
  border: none;
  background: var(--b-bg);
  color: var(--b-text-muted);
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  font-size: 16px;
  transition: all var(--b-transition);
}

.modal-close:hover {
  background: var(--b-danger-light);
  color: var(--b-danger);
}

/* ============================================================
   TOAST
   ============================================================ */
.toast {
  position: fixed;
  top: 72px;
  left: 50%;
  transform: translateX(-50%);
  padding: 10px 22px;
  border-radius: var(--b-radius);
  font-size: 13px;
  font-weight: 500;
  z-index: 2000;
  animation: toastIn 0.3s ease;
  box-shadow: var(--b-shadow-md);
}

@keyframes toastIn {
  from { opacity: 0; transform: translateX(-50%) translateY(-8px); }
  to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

.toast-success { background: var(--b-success-light); color: var(--b-success-text); border: 1px solid var(--b-success); }
.toast-error { background: var(--b-danger-light); color: var(--b-danger-text); border: 1px solid var(--b-danger); }
.toast-warning { background: var(--b-warning-light); color: var(--b-warning-text); border: 1px solid var(--b-warning); }
.toast-info { background: var(--b-info-light); color: var(--b-info-text); border: 1px solid var(--b-info); }

/* ============================================================
   HERO BANNER (page-specific, optional)
   ============================================================ */
.hero-banner {
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 40%, #0f3460 100%);
  border-radius: var(--b-radius-xl);
  padding: 28px 32px;
  margin-bottom: 20px;
  color: #fff;
  position: relative;
  overflow: hidden;
}

.hero-banner .hero-title {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 6px;
}

.hero-banner .hero-desc {
  font-size: 13px;
  opacity: 0.7;
  line-height: 1.5;
}

/* white variant hero */
.hero-light {
  background: linear-gradient(135deg, var(--b-primary-light), var(--b-secondary-light));
  border: 1px solid var(--b-border);
  color: var(--b-text);
}

/* ============================================================
   MISC UTILITIES
   ============================================================ */
.text-primary { color: var(--b-primary); }
.text-secondary { color: var(--b-text-secondary); }
.text-muted { color: var(--b-text-muted); }
.text-success { color: var(--b-success); }
.text-danger { color: var(--b-danger); }
.text-warning { color: var(--b-warning); }

.bg-primary-light { background: var(--b-primary-light); }
.bg-surface { background: var(--b-surface); }
.bg-bg { background: var(--b-bg); }

.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-1 { flex: 1; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: 8px; }
.gap-2 { gap: 12px; }
.gap-3 { gap: 16px; }

.text-center { text-align: center; }
.text-sm { font-size: 12px; }
.text-xs { font-size: 11px; }
.font-bold { font-weight: 700; }
.font-semibold { font-weight: 600; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
    transition: transform var(--b-transition);
  }
  .sidebar.open { transform: translateX(0); }
  .main-content { margin-left: 0; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .topbar { padding: 0 16px; }
}