/* =====================================================
   校园失物招领管理系统 - 公共基础样式（所有页面共用）
   ===================================================== */

/* ---------- CSS 变量 ---------- */
:root {
    --primary: #4A90D9;
    --primary-dark: #357ABD;
    --primary-light: #6BA5E7;
    --accent: #F5A623;
    --success: #28A745;
    --danger: #DC3545;
    --warning: #FFC107;
    --info: #17A2B8;
    --bg: #F0F4F8;
    --card-bg: #FFFFFF;
    --text: #333333;
    --text-muted: #6C757D;
    --border: #E1E8ED;
}

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

body {
    font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.main-content {
    flex: 1;
    padding: 2rem 0;
}

/* ---------- 导航栏 ---------- */
.navbar {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    box-shadow: 0 2px 12px rgba(74, 144, 217, 0.3);
    padding: 0.5rem 0;
}
.navbar-brand {
    font-size: 1.4rem;
    font-weight: 700;
    color: #fff !important;
    letter-spacing: 0.5px;
}
.navbar-brand i { margin-right: 8px; color: var(--accent); }
.navbar .nav-link {
    color: rgba(255, 255, 255, 0.9) !important;
    font-weight: 500;
    margin: 0 4px;
    padding: 8px 16px !important;
    border-radius: 6px;
    transition: all 0.3s ease;
}
.navbar .nav-link:hover {
    background: rgba(255, 255, 255, 0.15);
    color: #fff !important;
    transform: translateY(-1px);
}
.navbar .nav-link.active {
    background: rgba(255, 255, 255, 0.2);
    color: #fff !important;
}
.navbar .user-badge {
    background: rgba(255, 255, 255, 0.2);
    color: #fff;
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
}
.navbar-toggler { border-color: rgba(255, 255, 255, 0.5); }
.navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(255, 255, 255, 0.8)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

/* ---------- 卡片 ---------- */
.card {
    border: none;
    border-radius: 12px;
    box-shadow: 0 2px 16px rgba(0, 0, 0, 0.06);
    transition: all 0.3s ease;
    margin-bottom: 1.5rem;
    overflow: hidden;
}
.card:hover {
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
    transform: translateY(-3px);
}
.card-header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: #fff;
    font-weight: 600;
    font-size: 1.1rem;
    border-bottom: none;
    padding: 1rem 1.25rem;
}
.card-body { padding: 1.5rem; }
.card-footer {
    background: #FAFBFC;
    border-top: 1px solid var(--border);
    padding: 0.75rem 1.25rem;
}

/* ---------- 按钮 ---------- */
.btn {
    border-radius: 8px;
    font-weight: 500;
    padding: 0.5rem 1.25rem;
    transition: all 0.3s ease;
}
.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    border: none;
}
.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-dark) 0%, #2A5F9E 100%);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(74, 144, 217, 0.4);
}
.btn-success {
    background: linear-gradient(135deg, #28A745 0%, #1E7E34 100%);
    border: none;
}
.btn-danger {
    background: linear-gradient(135deg, #DC3545 0%, #B02A37 100%);
    border: none;
}
.btn-outline-primary {
    border: 2px solid var(--primary);
    color: var(--primary);
}
.btn-outline-primary:hover { background: var(--primary); color: #fff; }
.btn-lg { padding: 0.75rem 2rem; font-size: 1.1rem; border-radius: 10px; }

/* ---------- 表单 ---------- */
.form-control, .form-select {
    border: 2px solid var(--border);
    border-radius: 8px;
    padding: 0.6rem 1rem;
    font-size: 0.95rem;
    transition: all 0.3s ease;
}
.form-control:focus, .form-select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 0.2rem rgba(74, 144, 217, 0.15);
}
.form-label {
    font-weight: 600;
    color: var(--text);
    margin-bottom: 0.4rem;
    font-size: 0.9rem;
}

/* ---------- 表格 ---------- */
.table { border-radius: 8px; overflow: hidden; }
.table thead th {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: #fff;
    font-weight: 600;
    font-size: 0.9rem;
    border: none;
    padding: 0.75rem 1rem;
}
.table tbody td { vertical-align: middle; padding: 0.75rem 1rem; font-size: 0.9rem; }
.table tbody tr:hover { background: rgba(74, 144, 217, 0.04); }

/* ---------- 徽章 ---------- */
.badge-status { padding: 5px 12px; border-radius: 20px; font-size: 0.8rem; font-weight: 500; }
.badge-pending { background: #FFF3CD; color: #856404; }
.badge-found, .badge-claimed { background: #D4EDDA; color: #155724; }

/* ---------- Flash 消息 ---------- */
.alert {
    border: none;
    border-radius: 10px;
    padding: 1rem 1.25rem;
    margin-bottom: 1.5rem;
    animation: slideDown 0.3s ease;
}
@keyframes slideDown {
    from { opacity: 0; transform: translateY(-10px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ---------- 空状态 ---------- */
.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--text-muted);
}
.empty-state i { font-size: 4rem; margin-bottom: 1rem; display: block; opacity: 0.4; }
.empty-state p { font-size: 1.1rem; }

/* ---------- 页脚 ---------- */
.footer {
    background: #2C3E50;
    color: rgba(255, 255, 255, 0.7);
    padding: 1.5rem 0;
    text-align: center;
    font-size: 0.9rem;
    margin-top: auto;
}
.footer a { color: var(--primary-light); text-decoration: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 768px) {
    .card-header { font-size: 1rem; }
    .table thead th, .table tbody td { font-size: 0.8rem; padding: 0.5rem; }
}