/* ========== 全局 ========== */
* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: #f0f2f5;
    color: #333;
}

a { text-decoration: none; color: inherit; }

/* ========== 登录页 ========== */
.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.login-box {
    background: white;
    border-radius: 20px;
    padding: 40px;
    width: 400px;
    max-width: 90%;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

.login-header {
    text-align: center;
    margin-bottom: 30px;
}

.login-header .icon { font-size: 60px; margin-bottom: 10px; }
.login-header h1 { font-size: 24px; color: #1a1a2e; }
.login-header p { color: #888; font-size: 14px; margin-top: 5px; }

/* ========== 表单 ========== */
.form-group { margin-bottom: 20px; }
.form-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: 600;
    color: #555;
    font-size: 14px;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    font-size: 14px;
    transition: 0.3s;
    font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102,126,234,0.1);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.btn {
    display: inline-block;
    padding: 12px 30px;
    border: none;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: 0.3s;
    text-align: center;
}

.btn-primary { background: linear-gradient(135deg, #667eea, #764ba2); color: white; }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 5px 20px rgba(102,126,234,0.4); }

.btn-secondary { background: #6c757d; color: white; }
.btn-secondary:hover { background: #5a6268; }

.btn-info { background: #17a2b8; color: white; }
.btn-info:hover { background: #138496; }

.btn-danger { background: #dc3545; color: white; }
.btn-danger:hover { background: #c82333; }

.btn-sm { padding: 8px 16px; font-size: 13px; }
.btn-block { width: 100%; display: block; }

.btn-block { margin-top: 10px; }

/* ========== 提示 ========== */
.alert {
    padding: 15px 20px;
    border-radius: 10px;
    margin-bottom: 20px;
    font-weight: 600;
}
.alert-success { background: #d4edda; color: #155724; border: 1px solid #c3e6cb; }
.alert-error { background: #f8d7da; color: #721c24; border: 1px solid #f5c6cb; }

/* ========== 后台布局 ========== */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: 240px;
    height: 100vh;
    background: linear-gradient(180deg, #1a1a2e 0%, #16213e 100%);
    color: white;
    display: flex;
    flex-direction: column;
    z-index: 100;
}

.sidebar-header {
    padding: 30px 20px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.sidebar-header h2 { font-size: 20px; }

.sidebar-nav {
    flex: 1;
    padding: 20px 0;
}

.sidebar-nav a {
    display: block;
    padding: 14px 25px;
    color: rgba(255,255,255,0.7);
    transition: 0.3s;
    font-size: 15px;
}

.sidebar-nav a:hover,
.sidebar-nav a.active {
    background: rgba(102,126,234,0.2);
    color: white;
    border-left: 4px solid #667eea;
}

.sidebar-footer {
    padding: 20px;
    border-top: 1px solid rgba(255,255,255,0.1);
}

.sidebar-footer p {
    margin-bottom: 10px;
    font-size: 14px;
    color: rgba(255,255,255,0.8);
}

.main-content {
    margin-left: 240px;
    padding: 30px;
    min-height: 100vh;
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.page-header h1 { font-size: 26px; color: #1a1a2e; }

/* ========== 表格 ========== */
.table-container {
    background: white;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

table {
    width: 100%;
    border-collapse: collapse;
}

thead {
    background: #f8f9fa;
}

th {
    padding: 15px 12px;
    text-align: left;
    font-weight: 700;
    color: #555;
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

td {
    padding: 15px 12px;
    border-top: 1px solid #f0f0f0;
    font-size: 14px;
}

tr:hover { background: #f8f9fa; }

.badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}

.badge-success { background: #d4edda; color: #155724; }
.badge-danger { background: #f8d7da; color: #721c24; }

.actions { white-space: nowrap; }
.actions .btn { margin-right: 5px; }

/* ========== 卡片 ========== */
.form-card {
    background: white;
    border-radius: 15px;
    padding: 30px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.login-footer {
    text-align: center;
    margin-top: 20px;
    color: #888;
    font-size: 13px;
}

/* ========== 响应式 ========== */
@media (max-width: 768px) {
    .sidebar { width: 100%; height: auto; position: relative; }
    .main-content { margin-left: 0; }
    .form-row { grid-template-columns: 1fr; }
}