/* ========================================
   common.css — 学校数字大脑 公共样式
   ======================================== */

/* CSS Reset */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB",
                 "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    font-size: 14px;
    line-height: 1.6;
    color: #2E3440;
    background: #F5F7FA;
}

a { color: #2D5F8A; text-decoration: none; }
a:hover { color: #1C3A5E; }

img { max-width: 100%; height: auto; }

table { border-collapse: collapse; width: 100%; }
th, td { padding: 10px 12px; text-align: left; border-bottom: 1px solid #E5E7EB; }
th { background: #F9FAFB; font-weight: 600; color: #374151; font-size: 13px; }

/* CSS Variables */
:root {
    --primary: #1C3A5E;
    --primary-light: #2D5F8A;
    --primary-lighter: #E8F0FE;
    --accent: #2A6B5A;
    --success: #22C55E;
    --warning: #F59E0B;
    --danger: #EF4444;
    --info: #3B82F6;
    --text-primary: #1F2937;
    --text-secondary: #6B7280;
    --text-muted: #9CA3AF;
    --bg-primary: #FFFFFF;
    --bg-secondary: #F9FAFB;
    --bg-tertiary: #F3F4F6;
    --border: #E5E7EB;
    --border-light: #F3F4F6;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.07);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.1);
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
}

/* Utility Classes */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-muted { color: var(--text-muted); }
.text-success { color: var(--success); }
.text-warning { color: var(--warning); }
.text-danger { color: var(--danger); }

.mt-1 { margin-top: 4px; }
.mt-2 { margin-top: 8px; }
.mt-3 { margin-top: 16px; }
.mt-4 { margin-top: 24px; }
.mb-1 { margin-bottom: 4px; }
.mb-2 { margin-bottom: 8px; }
.mb-3 { margin-bottom: 16px; }
.mb-4 { margin-bottom: 24px; }

/* Common Components */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 8px 20px;
    border: none;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    gap: 6px;
    line-height: 1.5;
}
.btn:hover { opacity: 0.9; transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

.btn-primary { background: var(--primary); color: #fff; }
.btn-secondary { background: var(--bg-tertiary); color: var(--text-primary); border: 1px solid var(--border); }
.btn-success { background: var(--success); color: #fff; }
.btn-warning { background: var(--warning); color: #fff; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-small { padding: 4px 12px; font-size: 12px; }

.form-input, .form-select {
    padding: 8px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    font-size: 14px;
    outline: none;
    transition: border-color 0.2s;
    background: #fff;
}
.form-input:focus, .form-select:focus { border-color: var(--primary-light); box-shadow: 0 0 0 3px rgba(45,95,138,0.1); }

.badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 20px;
    height: 20px;
    padding: 0 6px;
    border-radius: 10px;
    background: var(--danger);
    color: #fff;
    font-size: 11px;
    font-weight: 600;
}

.card {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    padding: 20px;
    margin-bottom: 16px;
}

.section-card {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    padding: 20px;
    margin-bottom: 16px;
}
.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}
.section-header h2 { font-size: 16px; color: var(--text-primary); }

.data-table {
    width: 100%;
    background: #fff;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}
.data-table th { background: var(--primary); color: #fff; font-size: 13px; }
.data-table td { font-size: 13px; }
.data-table tr:hover td { background: var(--bg-secondary); }

.loading-spinner {
    text-align: center;
    padding: 40px;
    color: var(--text-muted);
    font-size: 14px;
}

.empty-text { text-align: center; padding: 30px; color: var(--text-muted); }
.error-text { text-align: center; padding: 30px; color: var(--danger); }

/* Status tags */
.status-tag {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 500;
}
.status-draft { background: #FEF3C7; color: #92400E; }
.status-finalized { background: #D1FAE5; color: #065F46; }
.status-archived { background: #E5E7EB; color: #374151; }
.status-pending { background: #DBEAFE; color: #1E40AF; }
.status-approved { background: #D1FAE5; color: #065F46; }
.status-rejected { background: #FEE2E2; color: #991B1B; }

/* Responsive breakpoints */
@media (max-width: 768px) {
    .pc-layout { display: none; }
    .mobile-layout { display: block; }
}
@media (min-width: 769px) {
    .mobile-layout { display: none; }
    .pc-layout { display: flex; }
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}
.fade-in { animation: fadeIn 0.3s ease; }

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}
.pulse { animation: pulse 2s ease-in-out infinite; }