/* ========== 沉稳商务主题 ========== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&display=swap');

:root {
    /* 稳重深色系 */
    --bg-primary: #1a1e24;
    --bg-secondary: #23282f;
    --bg-card: #2d333b;
    --bg-card-hover: #353c45;
    --border-color: #3f4752;
    --text-primary: #ffffff;
    --text-secondary: #cbd5e0;
    --text-muted: #94a3b8;

    /* 蓝色点缀 */
    --primary: #3b82f6;
    --primary-dark: #2563eb;
    --primary-light: #60a5fa;

    /* 功能色 */
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;

    /* 阴影（极淡） */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);

    /* 圆角（克制） */
    --rounded: 6px;
    --rounded-lg: 8px;

    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

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

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1.5rem;
}

/* ===== 导航栏 ===== */
.navbar {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 50;
    padding: 0.5rem 1rem;
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1rem;
    padding: 0;
}

.navbar h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
    letter-spacing: -0.02em;
}

.nav-links {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    align-items: center;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    padding: 0.4rem 0;
    border-bottom: 2px solid transparent;
    transition: color 0.2s, border-color 0.2s;
}

.nav-links a:hover {
    color: var(--text-primary);
    border-bottom-color: var(--primary);
}

#logout {
    color: var(--danger);
}
#logout:hover {
    color: #f87171;
    border-bottom-color: var(--danger);
}

/* ===== 卡片 ===== */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--rounded-lg);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-sm);
    transition: background 0.2s, box-shadow 0.2s;
}

.card:hover {
    background: var(--bg-card-hover);
    box-shadow: var(--shadow);
}

.card h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1.25rem;
    color: var(--text-primary);
    border-left: 4px solid var(--primary);
    padding-left: 1rem;
}

.card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

/* ===== 表单 ===== */
.form-group {
    margin-bottom: 1.25rem;
}

label {
    display: block;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

input, select, textarea {
    width: 100%;
    padding: 0.6rem 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--rounded);
    font-size: 1rem;
    font-family: inherit;
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: border-color 0.2s, box-shadow 0.2s;
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.3);
}

/* ===== 按钮 ===== */
button, .btn-primary {
    background: var(--primary);
    color: white;
    border: none;
    padding: 0.6rem 1.2rem;
    border-radius: var(--rounded);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    text-decoration: none;
}

button:hover, .btn-primary:hover {
    background: var(--primary-dark);
}

button:active {
    transform: scale(0.98);
}

button.secondary, .btn-secondary {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

button.secondary:hover, .btn-secondary:hover {
    background: var(--bg-card-hover);
    color: var(--text-primary);
}

button.danger {
    background: var(--danger);
}
button.danger:hover {
    background: #b91c1c;
}

/* ===== 错误/成功消息 ===== */
.error {
    color: var(--danger);
    font-size: 0.9rem;
    margin-top: 0.5rem;
    padding: 0.5rem 1rem;
    background: rgba(239, 68, 68, 0.1);
    border-left: 3px solid var(--danger);
}
.success {
    color: var(--success);
    font-size: 0.9rem;
    margin-top: 0.5rem;
    padding: 0.5rem 1rem;
    background: rgba(16, 185, 129, 0.1);
    border-left: 3px solid var(--success);
}

/* ===== 表格 ===== */
.table-responsive {
    overflow-x: auto;
    margin: 1rem 0;
    border: 1px solid var(--border-color);
    border-radius: var(--rounded-lg);
    background: var(--bg-card);
}

table {
    width: 100%;
    border-collapse: collapse;
    background: transparent;
    font-size: 0.95rem;
}

th {
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-weight: 600;
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

td {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-secondary);
}

tr:hover td {
    background: var(--bg-card-hover);
}

/* ===== 分页 ===== */
.pagination {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
    margin: 1.5rem 0;
    flex-wrap: wrap;
}
.pagination button,
.pagination a {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.4rem 0.8rem;
    border-radius: var(--rounded);
    text-decoration: none;
    font-size: 0.9rem;
    transition: background 0.2s, color 0.2s;
}
.pagination button:hover,
.pagination a:hover {
    background: var(--bg-card-hover);
    color: var(--text-primary);
}
.pagination .current {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

/* ===== 二维码图片 ===== */
.qr-image {
    max-width: 200px;
    border: 1px solid var(--border-color);
    border-radius: var(--rounded);
    padding: 0.5rem;
    background: var(--bg-card);
}
img.qr-thumb {
    max-width: 50px;
    max-height: 50px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    cursor: pointer;
    transition: opacity 0.2s;
}
img.qr-thumb:hover {
    opacity: 0.8;
}

/* ===== 类型标签 ===== */
.type-badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
}
.type-live {
    background: rgba(16, 185, 129, 0.2);
    color: #10b981;
}
.type-static {
    background: rgba(59, 130, 246, 0.2);
    color: #3b82f6;
}

/* ===== 模态框 ===== */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    align-items: center;
    justify-content: center;
}
.modal-content {
    background: var(--bg-card);
    border-radius: var(--rounded-lg);
    padding: 2rem;
    width: 90%;
    max-width: 500px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
}
.close {
    float: right;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-muted);
    transition: color 0.2s;
}
.close:hover {
    color: var(--text-primary);
}

/* ===== 用户统计条 ===== */
.user-stats {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--rounded-lg);
    padding: 1rem;
    margin-bottom: 1.5rem;
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}
.stat-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.stat-item i {
    color: var(--primary);
    font-size: 1.2rem;
}
.stat-item span {
    color: var(--text-secondary);
}

/* ===== 工具类 ===== */
.text-center { text-align: center; }
.mt-2 { margin-top: 0.5rem; }
.mb-2 { margin-bottom: 0.5rem; }
.flex { display: flex; gap: 1rem; flex-wrap: wrap; }
.flex-center { display: flex; align-items: center; justify-content: center; }

/* ===== 响应式 ===== */
@media (max-width: 768px) {
    .navbar .container {
        flex-direction: column;
    }
    .navbar h2 {
        margin-bottom: 0.5rem;
    }
    .nav-links {
        justify-content: center;
        gap: 0.8rem;
    }
    .card {
        padding: 1rem;
    }
    .user-stats {
        flex-direction: column;
        gap: 0.8rem;
    }
}