/* ========== 全局变量 ========== */
:root {
    --color-primary: #27ae60;
    --color-primary-dark: #229954;
    --color-primary-light: #2ecc71;
    --color-primary-bg: #e8f5e8;
    --color-danger: #e74c3c;
    --color-danger-bg: #ffeaea;
    --color-warning: #f39c12;
    --color-warning-bg: #fff3e0;
    --color-info: #3b82f6;
    --color-info-bg: #e0f2fe;
    --color-text: #2c3e50;
    --color-text-light: #7f8c8d;
    --color-text-muted: #95a5a6;
    --color-border: #e8f5e8;
    --color-border-light: #ecf0f1;
    --color-bg: #f0f8f0;
    --color-bg-card: #ffffff;
    --color-bg-soft: #f8fdf8;
    --radius-sm: 5px;
    --radius: 10px;
    --radius-lg: 12px;
    --radius-pill: 25px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow: 0 4px 6px rgba(0,0,0,0.07);
    --shadow-lg: 0 4px 12px rgba(0,0,0,0.1);
    --transition: all 0.2s ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', Arial, sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a { color: var(--color-primary); text-decoration: none; }
a:hover { color: var(--color-primary-dark); }

/* ========== 头部导航 ========== */
.header {
    background: var(--color-primary);
    color: white;
    padding: 1rem 0;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.logo { font-size: 1.25rem; font-weight: bold; }
.logo a { color: white; }
.logo a:hover { color: white; opacity: 0.9; }

.nav-menu { display: flex; gap: 0.5rem; align-items: center; flex-wrap: wrap; }
.nav-menu a {
    color: white;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-pill);
    transition: var(--transition);
    font-size: 0.9rem;
}
.nav-menu a:hover { background-color: rgba(255,255,255,0.2); }
.nav-menu a.btn { background-color: rgba(255,255,255,0.2); border: 1px solid rgba(255,255,255,0.3); }
.nav-menu a.btn:hover { background-color: rgba(255,255,255,0.3); }

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
}

/* ========== 主容器 ========== */
.main-container {
    flex: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 20px;
    width: 100%;
}

.container { max-width: 800px; margin: 0 auto; }

/* ========== 卡片 ========== */
.card {
    background: var(--color-bg-card);
    border-radius: var(--radius);
    padding: 2rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--color-border);
}
.card.compact { padding: 1.25rem; }

/* ========== 按钮 ========== */
.btn {
    display: inline-block;
    padding: 0.65rem 1.5rem;
    background-color: var(--color-primary);
    color: white;
    text-decoration: none;
    border: none;
    border-radius: var(--radius-pill);
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.9rem;
    text-align: center;
    line-height: 1.4;
}
.btn:hover { background-color: var(--color-primary-light); transform: translateY(-1px); box-shadow: var(--shadow); }
.btn:active { transform: translateY(0); }
.btn:disabled { opacity: 0.6; cursor: not-allowed; transform: none; }

.btn-secondary { background-color: var(--color-text-muted); }
.btn-secondary:hover { background-color: #6c7a7d; }

.btn-danger { background-color: var(--color-danger); }
.btn-danger:hover { background-color: #c0392b; }

.btn-outline {
    background: white;
    border: 1px solid var(--color-text-muted);
    color: var(--color-text);
}
.btn-outline:hover { background: var(--color-primary-bg); border-color: var(--color-primary); color: var(--color-primary-dark); }

.btn-sm { padding: 0.4rem 0.9rem; font-size: 0.8rem; }
.btn-lg { padding: 0.85rem 2rem; font-size: 1.05rem; }

/* ========== 状态徽章 ========== */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.3rem 0.75rem;
    border-radius: var(--radius-pill);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.02em;
}
.badge-up { background: var(--color-primary-bg); color: var(--color-primary-dark); }
.badge-down { background: var(--color-danger-bg); color: var(--color-danger); }
.badge-paused { background: var(--color-warning-bg); color: var(--color-warning); }
.badge-unknown { background: #f5f5f5; color: var(--color-text-muted); }

/* ========== 提示消息 ========== */
.alert { padding: 1rem; border-radius: var(--radius-sm); margin-bottom: 1rem; }
.alert-error { color: var(--color-danger); background: var(--color-danger-bg); border-left: 4px solid var(--color-danger); }
.alert-success { color: var(--color-primary-dark); background: var(--color-primary-bg); border-left: 4px solid var(--color-primary); }
.alert-warning { color: var(--color-warning); background: var(--color-warning-bg); border-left: 4px solid var(--color-warning); }
.alert-info { color: var(--color-info); background: var(--color-info-bg); border-left: 4px solid var(--color-info); }

.error { color: var(--color-danger); background: var(--color-danger-bg); padding: 1rem; border-radius: var(--radius-sm); margin-bottom: 1rem; border-left: 4px solid var(--color-danger); }
.success { color: var(--color-primary-dark); background: var(--color-primary-bg); padding: 1rem; border-radius: var(--radius-sm); margin-bottom: 1rem; border-left: 4px solid var(--color-primary); }

/* ========== 表单 ========== */
.form-group { margin-bottom: 1.25rem; }
.form-group label { display: block; margin-bottom: 0.4rem; font-weight: 600; color: var(--color-text); font-size: 0.9rem; }
.form-group .form-help { color: var(--color-text-light); font-size: 0.8rem; margin-top: 0.3rem; }

input, select, textarea {
    width: 100%;
    padding: 0.65rem 0.9rem;
    border: 1px solid #bdc3c7;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    transition: var(--transition);
    background: white;
    font-family: inherit;
}
input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 2px rgba(39,174,96,0.15);
}
input[type="checkbox"], input[type="radio"] { width: auto; }

.form-row { display: flex; gap: 1rem; align-items: center; }
.form-inline { display: flex; gap: 0.5rem; align-items: center; }
.form-label { display: block; margin-bottom: 0.4rem; font-weight: 600; color: var(--color-text); font-size: 0.9rem; }

/* ========== Tab 导航 ========== */
.nav-tab {
    background: white;
    color: var(--color-text-light);
    border: 1px solid var(--color-text-muted);
    border-radius: var(--radius-sm);
    padding: 0.5rem 1rem;
    font-weight: 600;
    font-size: 0.875rem;
    cursor: pointer;
    transition: var(--transition);
}
.nav-tab:hover { color: var(--color-primary); border-color: var(--color-primary); }
.nav-tab.active { background: var(--color-primary); color: white; border-color: var(--color-primary); }

/* ========== Section（Tab 内容区） ========== */
.section { margin-top: 0; }

/* ========== 桌面/移动视图切换 ========== */
.desktop-view { display: block; }
.mobile-view { display: none; }
@media (max-width: 768px) {
    .desktop-view { display: none; }
    .mobile-view { display: block; }
}

/* ========== 表格 ========== */
.table-wrap { overflow-x: auto; border-radius: var(--radius-lg); box-shadow: var(--shadow-sm); }
table { width: 100%; border-collapse: collapse; background: white; white-space: nowrap; }
th, td { padding: 0.9rem 1rem; text-align: left; border-bottom: 1px solid var(--color-border-light); }
th { background: #e8e8e8; color: var(--color-text); font-weight: 600; font-size: 0.85rem; }
tr:hover { background-color: var(--color-bg-soft); }

/* ========== 统计卡片 ========== */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 1rem; margin-bottom: 1.5rem; }
.stat-card {
    background: var(--color-bg-card);
    border-radius: var(--radius);
    padding: 1.25rem;
    text-align: center;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
}
.stat-card .stat-value { font-size: 1.75rem; font-weight: bold; margin: 0.25rem 0; }
.stat-card .stat-label { color: var(--color-text-light); font-size: 0.85rem; }
.stat-card.up .stat-value { color: var(--color-primary); }
.stat-card.down .stat-value { color: var(--color-danger); }
.stat-card.paused .stat-value { color: var(--color-warning); }

/* ========== 分页 ========== */
.pagination { display: flex; gap: 0.25rem; justify-content: center; margin-top: 1.5rem; flex-wrap: wrap; }
.pagination button, .pagination a {
    padding: 0.4rem 0.75rem;
    border: 1px solid var(--color-border-light);
    background: white;
    border-radius: var(--radius-sm);
    cursor: pointer;
    color: var(--color-text);
    font-size: 0.85rem;
    transition: var(--transition);
}
.pagination button:hover:not(:disabled), .pagination a:hover { background: var(--color-primary-bg); border-color: var(--color-primary); }
.pagination button.active { background: var(--color-primary); color: white; border-color: var(--color-primary); }
.pagination button:disabled { opacity: 0.5; cursor: not-allowed; }

/* ========== 模态框 ========== */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.5);
    z-index: 2000;
    justify-content: center;
    align-items: center;
}
.modal-overlay.active { display: flex; }
.modal {
    background: white;
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
}
.modal h3 { margin-bottom: 1rem; color: var(--color-text); }

/* ========== 工具类 ========== */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-muted { color: var(--color-text-muted); }
.text-sm { font-size: 0.85rem; }
.text-lg { font-size: 1.1rem; }
.font-bold { font-weight: bold; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.gap-1 { gap: 0.5rem; }
.flex { display: flex; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.hidden { display: none; }
.w-full { width: 100%; }

.fade-in { animation: fadeIn 0.4s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

/* ========== Toast ========== */
.toast {
    position: fixed;
    top: 80px;
    right: 20px;
    padding: 1rem 1.5rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    z-index: 3000;
    color: white;
    animation: slideIn 0.3s ease;
}
.toast.success { background: var(--color-primary); }
.toast.error { background: var(--color-danger); }
.toast.warning { background: var(--color-warning); }
@keyframes slideIn { from { transform: translateX(120%); } to { transform: translateX(0); } }

/* ========== 页脚 ========== */
.footer {
    background-color: #2c3e50;
    color: white;
    padding: 2rem 0;
    margin-top: auto;
}
.footer-container { max-width: 1200px; margin: 0 auto; padding: 0 20px; text-align: center; }
.footer a { color: #bdc3c7; }
.footer a:hover { color: white; }

/* ========== 响应式 ========== */
@media (max-width: 768px) {
    .header-container { flex-direction: column; align-items: stretch; }
    .logo { display: flex; justify-content: space-between; align-items: center; }
    .mobile-menu-toggle { display: block; }
    .nav-menu { display: none; flex-direction: column; margin-top: 0.5rem; width: 100%; gap: 0.25rem; }
    .nav-menu.active { display: flex; }
    .nav-menu a { text-align: center; }
    .main-container { padding: 1rem; }
    .card { padding: 1rem; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .form-row { flex-direction: column; align-items: stretch; }
    table { font-size: 0.85rem; }
    th, td { padding: 0.5rem; }
}