/* ========== CSS 变量 ========== */
:root {
    --bg-primary: #0f1923;
    --bg-secondary: #1a2332;
    --bg-card: #1e2d3d;
    --bg-hover: #243447;
    --border: #2a3a4a;
    --text-primary: #e0e6ed;
    --text-secondary: #8899aa;
    --text-muted: #5a6a7a;
    --accent-blue: #4a9eff;
    --accent-green: #00d68f;
    --accent-orange: #ffaa00;
    --accent-red: #ff4d6a;
    --accent-purple: #a855f7;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Noto Sans SC', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

/* ========== 顶部导航 ========== */
.navbar {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    padding: 0 24px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}

.navbar-brand .icon {
    font-size: 22px;
}

.navbar-info {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 13px;
    color: var(--text-secondary);
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent-green);
    display: inline-block;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

/* ========== 主内容区 ========== */
.container {
    max-width: 1440px;
    margin: 0 auto;
    padding: 20px 24px;
}

/* ========== 统计卡片 ========== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px;
    transition: transform 0.2s, box-shadow 0.2s;
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.stat-card .label {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.stat-card .value {
    font-size: 32px;
    font-weight: 700;
    line-height: 1;
}

.stat-card .sub {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 6px;
}

.stat-card.tcp .value { color: var(--accent-blue); }
.stat-card.udp .value { color: var(--accent-purple); }
.stat-card.total .value { color: var(--accent-green); }
.stat-card.system .value { color: var(--accent-orange); font-size: 18px; font-weight: 500; }

/* ========== 筛选栏 ========== */
.filter-bar {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 16px 20px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.filter-bar label {
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 500;
}

.filter-bar input,
.filter-bar select {
    background: var(--bg-primary);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 8px 12px;
    border-radius: 8px;
    font-size: 13px;
    outline: none;
    transition: border-color 0.2s;
}

.filter-bar input:focus,
.filter-bar select:focus {
    border-color: var(--accent-blue);
}

.filter-bar input { width: 140px; }
.filter-bar select { width: 120px; }

.btn {
    padding: 8px 16px;
    border-radius: 8px;
    border: none;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.btn-primary {
    background: var(--accent-blue);
    color: white;
}

.btn-primary:hover { opacity: 0.85; }

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

.btn-ghost:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.btn-ghost.active {
    background: var(--accent-blue);
    color: white;
    border-color: var(--accent-blue);
}

.spacer { flex: 1; }

.refresh-indicator {
    font-size: 12px;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 6px;
}

/* ========== 端口表格 ========== */
.table-wrapper {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
}

.table-header {
    padding: 14px 20px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 14px;
    font-weight: 600;
}

.table-header .count {
    font-size: 12px;
    color: var(--text-muted);
    font-weight: 400;
    margin-left: 8px;
}

table {
    width: 100%;
    border-collapse: collapse;
}

thead {
    background: var(--bg-secondary);
    position: sticky;
    top: 0;
}

th {
    padding: 12px 16px;
    text-align: left;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    white-space: nowrap;
    cursor: pointer;
    user-select: none;
    border-bottom: 1px solid var(--border);
}

th:hover { color: var(--text-primary); }
th .sort-icon { margin-left: 4px; opacity: 0.4; }
th.sorted .sort-icon { opacity: 1; color: var(--accent-blue); }

td {
    padding: 11px 16px;
    font-size: 13px;
    border-bottom: 1px solid rgba(42, 58, 74, 0.5);
    white-space: nowrap;
}

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

/* 协议标签 */
.protocol-tag {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.5px;
}

.protocol-tag.tcp {
    background: rgba(74, 158, 255, 0.15);
    color: var(--accent-blue);
}

.protocol-tag.udp {
    background: rgba(168, 85, 247, 0.15);
    color: var(--accent-purple);
}

/* 端口号 */
.port-num {
    font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    font-weight: 600;
    color: var(--accent-green);
    font-size: 14px;
}

/* 进程名 */
.process-name {
    font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    color: var(--accent-orange);
    font-weight: 500;
}

/* PID */
.pid-num {
    font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    color: var(--accent-blue);
}

/* 绑定地址 */
.bind-addr {
    font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    color: var(--text-secondary);
    font-size: 12px;
}

/* 内存 */
.memory-tag {
    display: inline-block;
    padding: 1px 8px;
    border-radius: 4px;
    font-size: 11px;
    font-family: 'SF Mono', monospace;
}

.memory-tag.low { background: rgba(0, 214, 143, 0.12); color: var(--accent-green); }
.memory-tag.mid { background: rgba(255, 170, 0, 0.12); color: var(--accent-orange); }
.memory-tag.high { background: rgba(255, 77, 106, 0.12); color: var(--accent-red); }

/* ========== 端口范围色带 ========== */
.port-range-bar {
    display: flex;
    gap: 2px;
    margin-bottom: 20px;
    height: 32px;
    border-radius: 8px;
    overflow: hidden;
}

.port-range-segment {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 10px;
    font-weight: 600;
    color: white;
    cursor: pointer;
    transition: opacity 0.2s;
    position: relative;
}

.port-range-segment:hover { opacity: 0.8; }
.port-range-segment .tooltip {
    display: none;
    position: absolute;
    bottom: 110%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-primary);
    border: 1px solid var(--border);
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 11px;
    white-space: nowrap;
    z-index: 10;
}

.port-range-segment:hover .tooltip { display: block; }

/* ========== 加载动画 ========== */
.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 60px;
    color: var(--text-muted);
}

.spinner {
    width: 24px;
    height: 24px;
    border: 3px solid var(--border);
    border-top-color: var(--accent-blue);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-right: 12px;
}

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

/* ========== 空状态 ========== */
.empty-state {
    text-align: center;
    padding: 60px;
    color: var(--text-muted);
}

/* ========== 响应式 ========== */
@media (max-width: 768px) {
    .container { padding: 12px; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
    .stat-card .value { font-size: 24px; }
    .filter-bar { flex-direction: column; align-items: stretch; }
    .filter-bar input, .filter-bar select { width: 100%; }
    td, th { padding: 8px 10px; font-size: 12px; }
    .port-range-bar { display: none; }
}

/* ========== 自动刷新滑块 ========== */
.auto-refresh {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    color: var(--text-muted);
}

.auto-refresh select {
    background: var(--bg-primary);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 4px 8px;
    border-radius: 6px;
    font-size: 12px;
}

/* ========== 搜索高亮 ========== */
.highlight {
    background: rgba(74, 158, 255, 0.25);
    padding: 1px 2px;
    border-radius: 2px;
}