:root {
    --primary: #4f46e5;
    --bg: #f1f5f9;
    --card-bg: #ffffff;
    --text: #1e293b;
    --text-secondary: #64748b;
    --border: #e2e8f0;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --radius: 12px;
    --shadow: 0 1px 3px rgba(0,0,0,0.08);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html, body {
    max-width: 100%;
    overflow-x: hidden;
}
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
}
.navbar {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border);
    padding: 0 1rem;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: sticky;
    top: 0;
    z-index: 100;
}
.navbar-brand {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
}
.navbar-brand img { width: 32px; height: 32px; border-radius: 8px; object-fit: cover; }

/* 主布局 */
.main-layout {
    display: flex;
    max-width: 1400px;
    margin: 0 auto;
    padding: 1.5rem;
    gap: 2rem;
}

/* 侧边栏 */
.sidebar {
    width: 200px;
    flex-shrink: 0;
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1rem;
    height: fit-content;
    position: sticky;
    top: 80px;
}
.sidebar h2 {
    font-size: 1rem;
    margin-bottom: 0.75rem;
    color: var(--text);
}
.filter-btn {
    display: block;
    width: 100%;
    padding: 0.6rem 1rem;
    margin-bottom: 0.5rem;
    border: none;
    background: transparent;
    text-align: left;
    cursor: pointer;
    border-radius: 6px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    transition: all 0.2s;
}
.filter-btn:hover { background: #f1f5f9; }
.filter-btn.active { background: var(--primary); color: white; }

/* 内容区 */
.content { flex: 1; min-width: 0; }
.server-groups { display: flex; flex-direction: column; gap: 1.5rem; }

/* 分组容器 */
.group-container {
    background: #fff;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow: hidden;
}
.group-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.9rem 1.2rem;
    cursor: pointer;
    background: #f8fafc;
    border-bottom: 1px solid var(--border);
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}
.group-title { font-weight: 600; font-size: 1rem; }
.group-toggle { font-size: 1.1rem; color: var(--text-secondary); transition: transform 0.25s ease; display: inline-block; }
.group-container.collapsed .group-toggle { transform: rotate(-90deg); }
.group-body {
    padding: 1.2rem;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 1.2rem;
}
.group-container.collapsed .group-body { display: none; }

/* 服务器卡片 */
.server-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1.25rem;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    border: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}
.server-card:hover { transform: translateY(-3px); box-shadow: 0 8px 20px rgba(0,0,0,0.1); }
.server-card.disabled { cursor: not-allowed; opacity: 0.7; }
.server-card.disabled:hover { transform: none; box-shadow: var(--shadow); }
.server-logo {
    width: 70px;
    height: 70px;
    border-radius: 16px;
    object-fit: cover;
    margin-bottom: 0.75rem;
    background: #e2e8f0;
}
.server-name { font-size: 1.05rem; font-weight: 700; margin-bottom: 0.4rem; }
.server-status {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 500;
    margin-bottom: 0.6rem;
}
.status-open { background: #ecfdf5; color: #059669; }
.status-waiting { background: #fffbeb; color: #d97706; }
.status-closed { background: #f1f5f9; color: #64748b; }
.status-ended { background: #fef2f2; color: #dc2626; }
.server-desc {
    font-size: 0.8rem;
    color: var(--text-secondary);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* 底部 */
.footer-note {
    text-align: center;
    margin-top: 2rem;
    color: var(--text-secondary);
    font-size: 0.8rem;
}
.footer-note a { color: var(--primary); text-decoration: none; }
.footer-note a:hover { text-decoration: underline; }

/* 模态框 */
.modal-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.5);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    animation: fadeIn 0.2s ease;
}
.modal {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 2rem 1.2rem;
    max-width: 90%;
    width: 320px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.2);
    text-align: center;
    animation: slideUp 0.3s ease;
}
.modal-icon { font-size: 2.5rem; margin-bottom: 0.5rem; }
.modal-title { font-size: 1.1rem; font-weight: 700; margin-bottom: 0.5rem; }
.modal-message { font-size: 0.9rem; color: var(--text-secondary); margin-bottom: 1.2rem; }
.modal-btn {
    display: inline-block;
    padding: 8px 20px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 0.9rem;
    cursor: pointer;
}
.modal-btn:hover { background: #4338ca; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }

/* ========== 移动端适配 ========== */
@media (max-width: 768px) {
    .main-layout {
        flex-direction: column;
        padding: 0.75rem;
        gap: 0.75rem;
    }

    /* 侧边栏：三个按钮等宽显示，无需滚动 */
    .sidebar {
        width: 100%;
        position: sticky;
        top: 56px;
        z-index: 99;
        display: flex;
        flex-wrap: nowrap;
        gap: 0.5rem;
        padding: 0.5rem;
        background: rgba(255, 255, 255, 0.9);
        backdrop-filter: blur(10px);
        border-radius: 10px;
        box-shadow: 0 1px 3px rgba(0,0,0,0.08);
        margin-bottom: 0;
    }
    .sidebar h2 { display: none; }
    .filter-btn {
        flex: 1 1 0;                /* 等宽分配 */
        white-space: nowrap;
        padding: 0.6rem 0.2rem;
        font-size: 0.8rem;
        margin-bottom: 0;
        border-radius: 20px;
        border: 1px solid var(--border);
        background: #fff;
        color: var(--text-secondary);
        text-align: center;
    }
    .filter-btn.active {
        background: var(--primary);
        color: white;
        border-color: var(--primary);
    }

    /* 分组容器 */
    .group-container { border-radius: 12px; }
    .group-header {
        padding: 1rem 1.2rem;
    }
    .group-title { font-size: 1rem; }
    .group-toggle { 
        font-size: 1.2rem;
    }
    .group-container.collapsed .group-toggle {
        transform: rotate(-90deg);
    }

    /* 卡片：单列横排 */
    .group-body {
        padding: 0.8rem;
        grid-template-columns: 1fr;
        gap: 0.8rem;
    }
    .server-card {
        padding: 1.2rem 1rem;
        flex-direction: row;
        text-align: left;
        align-items: center;
        gap: 1rem;
        border-radius: 12px;
        transition: transform 0.15s, box-shadow 0.15s;
        -webkit-tap-highlight-color: transparent;
    }
    .server-card:active {
        transform: scale(0.98);
        box-shadow: 0 2px 6px rgba(0,0,0,0.1);
    }
    .server-logo {
        width: 52px;
        height: 52px;
        border-radius: 12px;
        margin-bottom: 0;
        flex-shrink: 0;
    }
    .server-card .server-info-wrapper {
        flex: 1;
        min-width: 0;
    }
    .server-name {
        font-size: 1rem;
        margin-bottom: 0.25rem;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }
    .server-status {
        font-size: 0.7rem;
        padding: 2px 8px;
        margin-bottom: 0.25rem;
    }
    .server-desc {
        font-size: 0.75rem;
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
    }

    .footer-note { margin-top: 1rem; }

    /* 模态框优化 */
    .modal {
        width: 90%;
        max-width: 340px;
        padding: 1.5rem 1rem;
    }
    .modal-btn {
        width: 100%;
        padding: 12px 0;
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .navbar-brand { font-size: 1rem; }
    .main-layout { padding: 0.5rem; }
    .sidebar { padding: 0.4rem; gap: 0.4rem; }
    .filter-btn {
        padding: 0.5rem 0.1rem;
        font-size: 0.75rem;
    }
    .group-header { padding: 0.8rem 1rem; }
    .group-title { font-size: 0.9rem; }
    .server-card { padding: 1rem 0.8rem; gap: 0.8rem; }
    .server-logo { width: 46px; height: 46px; }
    .server-name { font-size: 0.95rem; }
    .server-desc { font-size: 0.7rem; }
}