:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --success: #16a34a;
    --danger: #dc2626;
    --warning: #f59e0b;
    --purple: #7c3aed;
    --bg: #f3f4f6;
    --card: #ffffff;
    --text: #1f2937;
    --text-light: #6b7280;
    --border: #e5e7eb;
  }
  * { box-sizing: border-box; margin: 0; padding: 0; }
  body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
  }
  .container { max-width: 1300px; margin: 0 auto; padding: 20px; }
  
  /* Header */
  .header {
    background: linear-gradient(135deg, #1e3a8a, #2563eb);
    color: white;
    padding: 20px;
    border-radius: 12px;
    margin-bottom: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1);
    flex-wrap: wrap;
    gap: 15px;
  }
  .header h1 { font-size: 24px; }
  .header-stats { display: flex; gap: 15px; font-size: 14px; flex-wrap: wrap; }
  .stat-box { background: rgba(255,255,255,0.1); padding: 5px 10px; border-radius: 6px; }
  .stat-box span { font-weight: bold; color: #fbbf24; margin-left: 5px; }
  .stat-box.negative span { color: #fca5a5; }

  /* Cards */
  .card {
    background: var(--card);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    border: 1px solid var(--border);
  }
  .card-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--primary);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 10px;
  }

  /* Buttons */
  .btn {
    padding: 8px 16px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 6px;
  }
  .btn:hover { transform: translateY(-1px); box-shadow: 0 2px 4px rgba(0,0,0,0.1); }
  .btn:active { transform: translateY(0); }
  .btn-primary { background: var(--primary); color: white; }
  .btn-primary:hover { background: var(--primary-hover); }
  .btn-success { background: var(--success); color: white; }
  .btn-danger { background: var(--danger); color: white; }
  .btn-warning { background: var(--warning); color: white; }
  .btn-purple { background: var(--purple); color: white; }
  .btn-outline { background: transparent; border: 1px solid var(--primary); color: var(--primary); }
  .btn-outline:hover { background: #eff6ff; }
  .btn-sm { padding: 4px 10px; font-size: 12px; }
  .btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }
  .btn-lg { padding: 12px 24px; font-size: 16px; width: 100%; justify-content: center; }

  /* Layout */
  .game-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
  @media (max-width: 900px) { .game-layout { grid-template-columns: 1fr; } }

  /* Start Screen */
  .start-screen { text-align: center; padding: 60px 20px; }
  .start-screen h2 { font-size: 32px; margin-bottom: 20px; color: var(--primary); }
  .type-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 15px; margin: 30px 0; }
  .type-card {
    border: 2px solid var(--border);
    border-radius: 10px;
    padding: 20px;
    cursor: pointer;
    transition: all 0.2s;
    text-align: left;
  }
  .type-card:hover { border-color: var(--primary); background: #eff6ff; }
  .type-card.selected { border-color: var(--primary); background: #dbeafe; }
  .type-card h3 { margin-bottom: 8px; }
  .type-card p { font-size: 12px; color: var(--text-light); margin-bottom: 4px; }
  .type-card .type-features { margin-top: 10px; font-size: 11px; }
  .type-card .type-features span { display: inline-block; background: rgba(0,0,0,0.05); padding: 2px 6px; border-radius: 4px; margin: 2px; }
  .input-group { margin: 20px 0; }
  .input-group input {
    padding: 10px 15px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 16px;
    width: 300px;
    max-width: 100%;
  }

  /* Operations */
  .ops-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 10px; }
  .op-btn {
    padding: 15px;
    background: #f9fafb;
    border: 1px solid var(--border);
    border-radius: 8px;
    cursor: pointer;
    text-align: center;
    transition: all 0.2s;
  }
  .op-btn:hover { background: #eff6ff; border-color: var(--primary); }
  .op-btn.disabled { opacity: 0.5; cursor: not-allowed; }
  .op-btn .op-icon { font-size: 24px; margin-bottom: 5px; }
  .op-btn .op-name { font-size: 14px; font-weight: 500; }
  .op-btn .op-desc { font-size: 11px; color: var(--text-light); margin-top: 4px; }
  .op-btn .op-cost { font-size: 11px; color: var(--danger); margin-top: 2px; font-weight: 500; }
  .op-btn .op-income { font-size: 11px; color: var(--success); margin-top: 2px; font-weight: 500; }

  /* Tabs */
  .tabs { display: flex; gap: 5px; margin-bottom: 15px; border-bottom: 2px solid var(--border); flex-wrap: wrap; }
  .tab {
    padding: 10px 15px;
    cursor: pointer;
    font-weight: 500;
    color: var(--text-light);
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    transition: all 0.2s;
    font-size: 14px;
  }
  .tab.active { color: var(--primary); border-bottom-color: var(--primary); }
  .tab:hover { color: var(--primary); }

  /* Employee List */
  .emp-list { max-height: 300px; overflow-y: auto; }
  .emp-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px;
    border-bottom: 1px solid var(--border);
  }
  .emp-item:last-child { border-bottom: none; }
  .emp-info { display: flex; flex-direction: column; }
  .emp-name { font-weight: 500; }
  .emp-pos { font-size: 12px; color: var(--text-light); }
  .emp-salary { color: var(--danger); font-weight: 500; font-size: 14px; }

  /* Market Companies */
  .market-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px;
    background: #f9fafb;
    border-radius: 8px;
    margin-bottom: 10px;
  }
  .market-info h4 { margin-bottom: 4px; }
  .market-info p { font-size: 12px; color: var(--text-light); }
  .market-actions { display: flex; gap: 8px; flex-wrap: wrap; justify-content: flex-end; }

  /* Slider */
  .slider-container { margin: 20px 0; }
  .slider-container input[type="range"] { width: 100%; }
  .slider-value { text-align: center; font-size: 24px; font-weight: bold; color: var(--primary); margin: 10px 0; }

  /* Toast */
  .toast {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 12px 24px;
    background: #1f2937;
    color: white;
    border-radius: 8px;
    font-size: 14px;
    z-index: 1000;
    opacity: 0;
    transform: translateX(100%);
    transition: all 0.3s;
    max-width: 320px;
  }
  .toast.show { opacity: 1; transform: translateX(0); }
  .toast.success { background: var(--success); }
  .toast.error { background: var(--danger); }
  .toast.warning { background: var(--warning); }
  .toast.event { background: var(--purple); }

  /* Stats Grid */
  .stats-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; margin-bottom: 15px; }
  .stat-item { background: #f9fafb; padding: 10px; border-radius: 8px; text-align: center; }
  .stat-label { font-size: 12px; color: var(--text-light); }
  .stat-value { font-size: 18px; font-weight: bold; color: var(--primary); }

  .recruit-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 8px; margin-top: 10px; }
  
  .badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 11px;
    font-weight: 500;
  }
  .badge-blue { background: #dbeafe; color: #1d4ed8; }
  .badge-green { background: #dcfce7; color: #166534; }
  .badge-purple { background: #f3e8ff; color: #7e22ce; }
  .badge-orange { background: #ffedd5; color: #c2410c; }
  .badge-gray { background: #f3f4f6; color: #4b5563; }
  .badge-red { background: #fee2e2; color: #991b1b; }
  
  .next-turn-preview {
    background: #fffbeb;
    border: 1px solid #fcd34d;
    padding: 10px;
    border-radius: 6px;
    margin-bottom: 15px;
    font-size: 13px;
    color: #92400e;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 8px;
  }

  /* R&D Specific Styles */
  .rd-container {
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 15px;
    background: #f8fafc;
    margin-bottom: 15px;
  }
  .rd-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
    border-bottom: 1px solid #e2e8f0;
    padding-bottom: 8px;
  }
  .config-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
    font-size: 14px;
  }
  .config-label { color: var(--text-light); width: 80px; flex-shrink: 0; }
  .config-select {
    flex: 1;
    padding: 6px;
    border: 1px solid var(--border);
    border-radius: 4px;
    background: white;
    min-width: 0;
  }
  .progress-bar-bg {
    width: 100%;
    height: 8px;
    background: #e2e8f0;
    border-radius: 4px;
    overflow: hidden;
    margin-top: 5px;
  }
  .progress-bar-fill {
    height: 100%;
    background: var(--primary);
    transition: width 0.3s ease;
  }
  .product-card {
    background: white;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 10px;
    margin-bottom: 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  .product-specs { font-size: 12px; color: var(--text-light); margin-top: 4px; }
  .product-declining { opacity: 0.7; }
  .product-declining .product-specs { color: var(--warning); }

  /* Tech list */
  .tech-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 15px;
  }
  .tech-item {
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
  }
  .tech-owned { background: #dcfce7; color: #166534; }
  .tech-locked { background: #f3f4f6; color: #9ca3af; }

  /* RD sub-tabs */
  .rd-subtabs {
    display: flex;
    gap: 2px;
    margin-bottom: 15px;
    background: #f3f4f6;
    border-radius: 8px;
    padding: 4px;
  }
  .rd-subtab {
    flex: 1;
    padding: 8px 12px;
    text-align: center;
    cursor: pointer;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-light);
    transition: all 0.2s;
    min-width: 0;
  }
  .rd-subtab.active {
    background: white;
    color: var(--primary);
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
  }

  .cost-preview {
    background: #eff6ff;
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 13px;
    margin-top: 10px;
    text-align: center;
    color: var(--primary);
    font-weight: 500;
  }

  /* 楼盘系统样式 */
  .building-card {
    background: white;
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 15px;
    margin-bottom: 12px;
    transition: all 0.2s;
  }
  .building-card:hover { box-shadow: 0 2px 8px rgba(0,0,0,0.08); }
  .building-card.building { border-left: 4px solid var(--warning); }
  .building-card.completed { border-left: 4px solid var(--success); }
  
  .building-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
  }
  .building-name { font-weight: 600; font-size: 15px; }
  .building-status { font-size: 12px; }
  
  .building-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
    margin-bottom: 10px;
  }
  .building-stat {
    background: #f9fafb;
    padding: 6px 10px;
    border-radius: 6px;
    font-size: 12px;
  }
  .building-stat-label { color: var(--text-light); }
  .building-stat-value { font-weight: 600; }
  
  .building-actions {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
  }
  
  .level-bar {
    display: flex;
    gap: 2px;
    margin-top: 4px;
  }
  .level-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: #e5e7eb;
  }
  .level-dot.filled { background: var(--success); }
  .level-dot.green { background: #22c55e; }
  .level-dot.blue { background: #3b82f6; }

  /* 事件弹窗 */
  .event-modal {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
  }
  .event-card {
    background: white;
    border-radius: 16px;
    padding: 30px;
    max-width: 450px;
    width: 90%;
    text-align: center;
    animation: popIn 0.3s ease;
  }
  @keyframes popIn {
    from { transform: scale(0.8); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
  }
  .event-icon { font-size: 60px; margin-bottom: 15px; }
  .event-title { font-size: 22px; font-weight: bold; margin-bottom: 10px; }
  .event-desc { color: var(--text-light); margin-bottom: 20px; line-height: 1.6; }
  .event-effect {
    background: #f9fafb;
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 14px;
  }
  .event-effect.positive { background: #f0fdf4; color: #166534; }
  .event-effect.negative { background: #fef2f2; color: #991b1b; }

  /* 芯片升级 */
  .chip-upgrade-card {
    background: white;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px;
    margin-bottom: 10px;
  }
  .chip-level {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 8px 0;
  }
  .chip-level-stars { color: #fbbf24; letter-spacing: 2px; }

  .empty-state {
    text-align: center;
    padding: 30px;
    color: var(--text-light);
  }
  .empty-state-icon { font-size: 40px; margin-bottom: 10px; }