/* ============================================================
   base.css - 基础重置、布局、头部、标签栏、按钮
   ============================================================ */

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
body{font-family:var(--font-sans);background:var(--c-gray-50);color:var(--c-gray-800);min-height:100vh;line-height:1.5;-webkit-font-smoothing:antialiased}

/* Header - Apple glassmorphism style */
.header{background:rgba(255,255,255,0.72);backdrop-filter:saturate(180%) blur(20px);-webkit-backdrop-filter:saturate(180%) blur(20px);color:var(--c-gray-800);padding:16px 0 0;border-bottom:1px solid rgba(0,0,0,0.05);position:sticky;top:0;z-index:100}
.header-inner{max-width:1280px;margin:0 auto;padding:0 24px 16px}
.header-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}
.header h1{font-size:24px;font-weight:700;letter-spacing:-0.02em;color:var(--c-gray-900)}
.header h1 small{font-size:14px;font-weight:400;color:var(--c-gray-400);margin-left:10px;letter-spacing:0}
.header-actions{display:flex;gap:10px}

/* Tabs - pill style on light background */
.tab-bar{display:flex;gap:4px;background:var(--c-gray-100);border-radius:var(--radius-md);padding:4px;width:fit-content}
.tab-btn{padding:8px 20px;border:none;border-radius:10px;background:transparent;color:var(--c-gray-600);font-size:14px;font-weight:500;cursor:pointer;transition:all 0.3s cubic-bezier(0.4,0,0.2,1)}
.tab-btn.active{background:var(--c-surface);color:var(--c-primary);box-shadow:var(--shadow-sm)}
.tab-btn:hover:not(.active){color:var(--c-gray-800)}

/* Buttons */
.btn{display:inline-flex;align-items:center;gap:6px;padding:10px 22px;border-radius:var(--radius-sm);font-size:15px;font-weight:500;cursor:pointer;border:none;transition:all 0.3s cubic-bezier(0.4,0,0.2,1)}
.btn-white{background:var(--c-gray-100);color:var(--c-gray-800)}.btn-white:hover{background:var(--c-gray-200)}
.btn-primary{background:var(--c-primary);color:var(--c-white)}.btn-primary:hover{background:var(--c-primary-dark);transform:translateY(-1px);box-shadow:0 4px 12px rgba(0,113,227,0.25)}
.btn-success{background:var(--c-success);color:var(--c-white)}.btn-success:hover{background:#2DB14A;transform:translateY(-1px)}
.btn-danger{background:var(--c-danger);color:var(--c-white)}.btn-danger:hover{background:#E02E24;transform:translateY(-1px)}
.btn-outline{background:transparent;border:1.5px solid var(--c-gray-200);color:var(--c-gray-800)}.btn-outline:hover{border-color:var(--c-primary);color:var(--c-primary)}
.btn-sm{padding:5px 12px;font-size:12px;border-radius:4px}
.btn-xs{padding:3px 10px;font-size:12px;border-radius:3px}

/* Main layout */
.main{max-width:1280px;margin:0 auto;padding:24px 24px 60px}

/* Footer */
.footer{text-align:center;padding:24px;font-size:13px;color:var(--c-gray-400)}

/* Stats */
.stats-bar{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:16px;margin-bottom:24px}
.stat-card{background:var(--c-surface);border-radius:var(--radius-lg);padding:18px 20px;display:flex;align-items:center;gap:14px;box-shadow:var(--shadow-sm);position:relative;overflow:hidden;cursor:pointer;transition:transform 0.4s cubic-bezier(0.4,0,0.2,1),box-shadow 0.4s cubic-bezier(0.4,0,0.2,1)}
.stat-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-md)}
.stat-icon{width:44px;height:44px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:18px;flex-shrink:0}
.stat-all .stat-icon{background:var(--c-gray-100)}
.stat-overdue .stat-icon{background:var(--c-danger-bg)}
.stat-done .stat-icon{background:var(--c-success-bg)}
.stat-active .stat-icon{background:var(--c-primary-light)}
.stat-card .num{font-size:28px;font-weight:700;color:var(--c-gray-900);line-height:1;letter-spacing:-0.02em}
.stat-card .label{font-size:13px;color:var(--c-gray-400);margin-top:4px;font-weight:500}

/* Filter bar */
.filter-bar{background:var(--c-surface);border-radius:var(--radius-lg);padding:14px 20px;margin-bottom:20px;box-shadow:var(--shadow-sm);display:flex;flex-wrap:wrap;gap:10px;align-items:center}
.filter-bar select,.filter-bar input{padding:9px 16px;border:1px solid var(--c-gray-100);border-radius:var(--radius-sm);font-size:14px;font-family:var(--font-sans);background:var(--c-surface);color:var(--c-gray-800);outline:none;transition:all 0.3s cubic-bezier(0.4,0,0.2,1);min-width:130px}
.filter-bar select:focus,.filter-bar input:focus{border-color:var(--c-primary);box-shadow:0 0 0 4px rgba(0,113,227,0.1)}
.filter-bar input[type=search]{flex:1;min-width:200px}
.filter-count{margin-left:auto;font-size:14px;color:var(--c-gray-400);font-weight:500}
.view-toggle{display:flex;gap:4px;margin-left:12px}
.view-btn{background:transparent;border:1px solid var(--c-gray-200);border-radius:var(--radius-sm);padding:6px 10px;font-size:16px;cursor:pointer;transition:all 0.2s;color:var(--c-gray-400)}
.view-btn:hover{border-color:var(--c-primary);color:var(--c-primary)}
.view-btn.active{background:var(--c-primary);border-color:var(--c-primary);color:#fff}
.filter-tips{font-size:12px;color:var(--c-gray-400);padding:4px 20px 0;margin-bottom:16px;display:flex;gap:16px;flex-wrap:wrap}

/* Loading & empty states */
.loading{text-align:center;padding:60px 20px;color:var(--c-gray-400)}
.loading .spinner{width:36px;height:36px;border:3px solid var(--c-gray-200);border-top-color:var(--c-primary);border-radius:50%;animation:spin 0.8s linear infinite;margin:0 auto 12px}
.empty-state{text-align:center;padding:60px 20px;color:var(--c-gray-400)}
.empty-state .icon{font-size:48px;margin-bottom:12px}
.empty-state p{font-size:15px}

/* Refresh button spinning */
.refresh-icon{display:inline-block}
.refresh-btn-loading .refresh-icon{animation:spin 0.8s linear infinite}
.refresh-btn-loading{pointer-events:none;opacity:0.7}

/* Banners */
.error-banner{background:var(--c-danger-bg);color:var(--c-danger);padding:14px 18px;border-radius:var(--radius-md);margin-bottom:16px;font-size:14px}
.success-banner{background:var(--c-success-bg);color:var(--c-success);padding:10px 16px;border-radius:var(--radius-md);margin-bottom:12px;font-size:13px}

/* Dark mode overrides for base */
html[data-theme="dark"] .header{background:rgba(28,28,30,0.72);border-bottom-color:rgba(255,255,255,0.08)}
html[data-theme="dark"] .tab-bar{background:var(--c-gray-100)}
html[data-theme="dark"] .btn-white{background:var(--c-gray-100);color:var(--c-gray-800)}
html[data-theme="dark"] .btn-white:hover{background:var(--c-gray-200)}
html[data-theme="dark"] .btn-outline{border-color:var(--c-gray-200);color:var(--c-gray-800)}
html[data-theme="dark"] .stat-all .stat-icon{background:var(--c-gray-100)}
html[data-theme="dark"] .form-group input[type="date"]::-webkit-calendar-picker-indicator{filter:invert(1)}