/* ===== 登录页 ===== */
.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
}

.login-card {
    width: 400px;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    overflow: hidden;
}

.login-card__header {
    text-align: center;
    padding: 2rem 2rem 1rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
}

.login-card__icon {
    font-size: 2.5rem;
    display: block;
    margin-bottom: 0.5rem;
}

.login-card__title {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 0;
}

.login-card__body {
    padding: 2rem;
}

.login-alert {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    font-size: 0.875rem;
}

.login-alert--error {
    background: #fef2f2;
    color: #dc2626;
    border: 1px solid #fecaca;
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: #374151;
    margin-bottom: 0.5rem;
}

.form-input {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid #d1d5db;
    border-radius: 8px;
    font-size: 0.9375rem;
    transition: border-color 0.2s, box-shadow 0.2s;
    box-sizing: border-box;
}

.form-input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.15);
}

.btn-login {
    width: 100%;
    padding: 0.75rem;
    border: none;
    border-radius: 8px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: opacity 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-login:hover:not(:disabled) {
    opacity: 0.9;
}

.btn-login:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.spin {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* ===== 后台布局 ===== */
.admin-layout {
    display: flex;
    min-height: 100vh;
}

.admin-sidebar {
    width: 220px;
    display: flex;
    flex-direction: column;
    background: #1e293b;
    color: #e2e8f0;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
}

.admin-sidebar__brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1.25rem 1.5rem;
    font-size: 1.125rem;
    font-weight: 700;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.admin-sidebar__brand i {
    font-size: 1.5rem;
    color: #818cf8;
}

.admin-nav {
    flex: 1;
    padding: 1rem 0;
}

.admin-nav__item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1.5rem;
    color: #94a3b8;
    text-decoration: none;
    transition: all 0.2s;
    font-size: 0.9375rem;
}

.admin-nav__item:hover,
.admin-nav__item.active {
    color: #fff;
    background: rgba(255, 255, 255, 0.08);
}

.admin-nav__item.active {
    border-right: 3px solid #818cf8;
}

.admin-sidebar__footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.btn-logout {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    width: 100%;
    padding: 0.625rem 0;
    border: none;
    background: none;
    color: #94a3b8;
    cursor: pointer;
    font-size: 0.875rem;
    transition: color 0.2s;
}

.btn-logout:hover {
    color: #f87171;
}

.admin-main {
    flex: 1;
    margin-left: 220px;
    display: flex;
    flex-direction: column;
}

.admin-header {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding: 0 1.5rem;
    height: 56px;
    background: #fff;
    border-bottom: 1px solid #e5e7eb;
}

.admin-header__user {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: #6b7280;
}

.admin-body {
    padding: 1.5rem;
    background: #f3f4f6;
    min-height: calc(100vh - 56px);
}

/* ===== 工作台 ===== */
.dashboard__title {
    font-size: 1.5rem;
    font-weight: 700;
    color: #1f2937;
    margin: 0 0 1.5rem;
}

.dashboard__cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
}

.stat-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

.stat-card__icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    color: #fff;
}

.stat-card--primary .stat-card__icon { background: linear-gradient(135deg, #667eea, #764ba2); }
.stat-card--success .stat-card__icon { background: linear-gradient(135deg, #34d399, #059669); }
.stat-card--warning .stat-card__icon { background: linear-gradient(135deg, #fbbf24, #f59e0b); }

.stat-card__value {
    display: block;
    font-size: 1.75rem;
    font-weight: 700;
    color: #1f2937;
    line-height: 1;
}

.stat-card__label {
    display: block;
    font-size: 0.8125rem;
    color: #9ca3af;
    margin-top: 0.25rem;
}