:root {
    --bg: #071027;
    --card: #0b1220;
    --muted: #9aa4b2;
    --accent: #7c5cff;
    --glass: rgba(255, 255, 255, 0.03);
    --success: #22c55e;
    --danger: #ef4444;
    --warn: #f59e0b;
    --info: #3b82f6; 
    --network: #ff8c00; /* Màu mạng */
    --maintenance: #a855f7; /* Màu mới cho Maintenance Mode */
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
}

/* LIGHT THEME */
body.light-theme {
    --bg: #f4f6f9;
    --card: #ffffff;
    --muted: #6b7280;
    --accent: #4f46e5;
    --glass: rgba(0, 0, 0, 0.05);
    color: #1f2937;
    background: linear-gradient(180deg, #e5e7eb 0%, #f4f6f9 100%);
}
body.light-theme .topbar {
    border-bottom-color: rgba(0, 0, 0, 0.1);
}
body.light-theme .card {
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(0, 0, 0, 0.1);
}
body.light-theme .btn.ghost { color: var(--muted); border: 1px solid var(--glass); }
body.light-theme .btn.ghost:hover { background: var(--glass); }
body.light-theme .log-area { background: #f0f0f0; color: #1f2937; border: 1px solid #ccc; }
body.light-theme .log-entry { border-bottom: 1px dotted rgba(0, 0, 0, 0.1); }
body.light-theme input[type="number"], body.light-theme select, body.light-theme textarea { background: #fff; color: #1f2937; border-color: #d1d5db; }
body.light-theme input[type="text"] { background: #fff; color: #1f2937; border-color: #d1d5db; }
body.light-theme .terminal-container { background-color: #fff; border: 1px solid #ccc; }
body.light-theme .terminal-output { color: #1f2937; }
body.light-theme .server-item { background: rgba(0, 0, 0, 0.02); }
body.light-theme .server-item.selected { background: rgba(79, 70, 229, 0.1); }


* { box-sizing: border-box }
html, body { height: 100% }
body {
    margin: 0;
    background: linear-gradient(180deg, #041224 0%, #071428 100%);
    color: #e6eef8;
    min-height: 100vh;
    display: flex;
    flex-direction: column
}

/* --- Global Elements --- */
.topbar {
    display: flex; align-items: center; justify-content: space-between;
    padding: 14px 20px; border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}
.brand {
    display: flex; align-items: center; gap: 10px;
}
.logo {
    width: 40px; height: 40px; background: var(--accent); 
    border-radius: 50%; display: flex; align-items: center; justify-content: center;
    font-size: 1.2rem; font-weight: 700; color: #fff;
}
.h1 {
    font-size: 1.2rem; margin: 0; font-weight: 600;
}
.small {
    font-size: 0.8rem; color: var(--muted);
}
.muted {
    color: var(--muted);
}

.controls {
    display: flex; gap: 10px; align-items: center;
}
.btn {
    padding: 8px 15px; border: none; border-radius: 6px;
    cursor: pointer; font-weight: 500; font-size: 0.9rem;
    display: inline-flex; align-items: center; gap: 8px;
    transition: background 0.2s, opacity 0.2s;
}
.btn.primary { background: var(--accent); color: #fff; }
.btn.primary:hover { opacity: 0.9; }
.btn.ghost { background: transparent; color: var(--muted); border: 1px solid var(--glass); }
.btn.ghost:hover { background: var(--glass); }
.btn.danger { background: var(--danger); color: #fff; }
.btn.danger.ghost { background: transparent; color: var(--danger); border-color: var(--danger); }
.btn.danger.ghost:hover { background: rgba(239, 68, 68, 0.1); }
.btn.success.ghost { background: transparent; color: var(--success); border-color: var(--success); }
.btn.success.ghost:hover { background: rgba(34, 197, 94, 0.1); }
.btn.secondary { background: var(--info); color: #fff; }
.btn.secondary:hover { opacity: 0.9; }
.btn.network { background: var(--network); color: #fff; }
.btn.network:hover { opacity: 0.9; }


.app-main {
    flex: 1; padding: 20px;
    /* BỐ CỤC CHUYÊN NGHIỆP PC: 3 cột 280px | 1fr (max) | 300px */
    display: grid;
    grid-template-columns: 280px 1fr 300px; 
    gap: 20px;
    max-width: 1600px; /* Tăng max-width để tận dụng màn hình lớn */
    width: 100%;
    margin: 0 auto;
}

.app-foot {
    padding: 10px 20px; text-align: center;
    font-size: 0.8rem; color: var(--muted);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    margin-top: 20px;
}

/* --- Card Styles --- */
.card {
    background: var(--card);
    border-radius: 12px;
    padding: 15px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.card h3 {
    margin-top: 0; margin-bottom: 15px;
    font-size: 1.1rem; border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    padding-bottom: 10px;
    color: var(--accent);
}

/* --- Layout Sections --- */
.sidebar {
    grid-column: 1 / 2;
    overflow-y: auto;
    max-height: calc(100vh - 100px); 
}

.main-content {
    grid-column: 2 / 3;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.control-panel {
    grid-column: 3 / 4;
}

/** FIX: Thay thế inline style trong HTML bằng class này **/
.details-grid {
    display: grid; 
    grid-template-columns: 1fr 1fr; 
    gap: 20px;
}

/* --- Server List --- */
.server-list {
    max-height: calc(100vh - 200px); 
    overflow-y: auto;
    padding-right: 5px;
}
.server-item {
    padding: 10px;
    margin-bottom: 8px;
    border-radius: 6px;
    background: rgba(255, 255, 255, 0.02);
    border-left: 4px solid transparent;
    cursor: pointer;
    transition: background 0.2s, border-left-color 0.2s;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.server-item:hover {
    background: var(--glass);
}
.server-item.selected {
    border-left-color: var(--accent);
    background: rgba(124, 92, 255, 0.1);
}
.server-item-info strong {
    font-weight: 600;
}
.server-item-metrics {
    font-size: 0.75rem;
    color: var(--muted);
    margin-top: 4px;
    display: flex;
    gap: 10px;
    align-items: center;
}
.server-item-metric-bar {
    width: 60px;
    height: 6px;
    border-radius: 3px;
    background: rgba(255, 255, 255, 0.1);
    position: relative;
    overflow: hidden;
}
.server-item-metric-bar-fill {
    height: 100%;
    transition: width 0.5s;
}

/* --- Health Overview Grid --- */
.health-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 15px;
    margin-top: 15px;
}
.health-metric {
    text-align: center;
    padding: 10px;
    border-radius: 8px;
    background: var(--glass);
}
.large-value {
    font-size: 2rem;
    font-weight: 700;
    line-height: 1;
}
.health-ok { color: var(--success); }
.health-warn { color: var(--warn); }
.health-danger { color: var(--danger); }
.health-total { color: var(--info); }

/* --- Realtime Metrics / Charts --- */
.chart-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}
.chart-container {
    height: 250px;
    padding: 15px;
}
.chart-container h4 {
    margin-top: 0;
    font-size: 1rem;
    color: var(--muted);
}

/* --- Server Details Grid --- */
.detail-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px 15px;
    font-size: 0.9rem;
    margin-bottom: 10px;
}
.detail-group {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 5px;
    border-bottom: 1px dotted var(--glass);
}
.detail-value {
    font-weight: 600;
}
.status-ok { color: var(--success); }
.status-warn { color: var(--warn); }
.status-critical, .status-deny, .status-down { color: var(--danger); }
.status-booting { color: var(--info); }
.status-maintenance { color: var(--maintenance); }
.status-allow { color: var(--success); }

/* --- System Logs --- */
.log-area {
    background: #000;
    color: #e6eef8;
    padding: 10px;
    border-radius: 6px;
    font-family: 'Consolas', 'Courier New', monospace;
    font-size: 0.8rem;
    max-height: 300px;
    overflow-y: scroll;
    white-space: pre-wrap;
    line-height: 1.4;
}
.log-area::-webkit-scrollbar {
    width: 6px;
}
.log-area::-webkit-scrollbar-thumb {
    background-color: rgba(255, 255, 255, 0.2);
    border-radius: 3px;
}
.log-entry {
    border-bottom: 1px dotted rgba(255, 255, 255, 0.05);
    padding: 3px 0;
    display: flex;
    gap: 8px;
}
.log-entry:last-child {
    border-bottom: none;
}
.log-timestamp { color: var(--muted); min-width: 130px; display: inline-block; }
.log-level { font-weight: 700; min-width: 70px; display: inline-block; }
/* Log Colors */
.log-level-CRITICAL { color: var(--danger); }
.log-level-WARN { color: var(--warn); }
.log-level-INFO { color: var(--info); }
.log-level-SYSTEM { color: #808080; }
.log-level-SUCCESS { color: var(--success); }

/* --- Input/Select/Config Styles --- */
.config-group {
    margin-top: 20px;
    padding-bottom: 15px;
    border-bottom: 1px dotted var(--glass);
}
.config-group label {
    font-size: 1rem;
    font-weight: 600;
    color: var(--accent);
}
.config-group p {
    font-size: 0.85rem;
    color: var(--muted);
    margin: 10px 0 5px 0;
}
input[type="number"], select, textarea { 
    padding: 8px; border-radius: 6px; border: 1px solid var(--glass);
    background: var(--card); color: #e6eef8;
    transition: border-color 0.2s;
    width: 100%;
    margin-top: 5px;
    resize: vertical; /* NGĂN CHẶN CHỈNH KÍCH THƯỚC NGANG */
}
input[type="number"]:focus, select:focus, textarea:focus {
    border-color: var(--accent);
    outline: none;
}
/* For Terminal Input */
input[type="text"] {
    padding: 4px; border: none;
    background: transparent; color: inherit;
    font-family: inherit;
    font-size: inherit;
    flex-grow: 1;
    outline: none;
}

/* --- Terminal Styles --- */
.terminal-container {
    background-color: #000;
    border: 1px solid var(--muted);
    border-radius: 6px;
    height: 300px;
    display: flex;
    flex-direction: column;
    padding: 10px;
    font-family: 'Consolas', 'Courier New', monospace;
    font-size: 0.9rem;
    color: #0f0;
}
.terminal-output {
    flex-grow: 1;
    overflow-y: auto;
    margin: 0;
    white-space: pre-wrap;
    padding-bottom: 5px;
}
.terminal-input-line {
    display: flex;
    align-items: center;
    gap: 5px;
}

/* --- Policy Table --- */
.policy-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
    margin-top: 10px;
}
.policy-table th, .policy-table td {
    border: 1px solid rgba(255, 255, 255, 0.05);
    padding: 8px;
    text-align: left;
}
.policy-table th {
    background-color: rgba(255, 255, 255, 0.05);
    color: var(--muted);
    font-weight: 500;
}
.policy-table td {
    vertical-align: middle;
}

/* --- Modal --- */
.modal {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex; align-items: center; justify-content: center;
    z-index: 1000;
}
.modal.hidden {
    display: none;
}
.modal > div, .modal > aside {
    background: var(--card);
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.5);
    max-width: 500px;
    width: 90%;
}

/* --- Speed Test Bar --- */
.speed-bar-container {
    width: 100%;
    background: var(--glass);
    border-radius: 6px;
    height: 15px;
    overflow: hidden;
}
.speed-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--info), var(--success));
    width: 0%;
    transition: width 0.1s linear;
}

/* --- Toast Notification --- */
.toast-container {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 10px;
    max-width: 300px;
}
.toast {
    padding: 10px 15px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
    color: #fff;
    font-size: 0.9rem;
    opacity: 1;
    transition: opacity 0.5s ease;
}
.toast-INFO { background: var(--info); }
.toast-WARN { background: var(--warn); }
.toast-CRITICAL { background: var(--danger); }
.toast-SUCCESS { background: var(--success); }


/* --- Responsive Design --- */

/* Màn hình từ 992px đến 1200px (PC nhỏ/Laptop) */
@media (max-width: 1200px) {
    .app-main {
        grid-template-columns: 240px 1fr; /* 2 Cột: Sidebar | Main/Control Panel */
    }
    
    .main-content {
        grid-column: 2 / 3;
    }

    .control-panel {
        grid-column: 2 / 3; /* Đẩy Control Panel xuống dưới Main Content */
        order: 2; /* Đặt Control Panel ở dưới Main */
        margin-top: 0;
    }
    
    .details-logs-panel {
        /* Bỏ dòng display: block !important; và dùng .details-grid */
    }

    .details-logs-panel > div, .details-grid {
        grid-template-columns: 1fr;
    }

    .health-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}


/* Màn hình nhỏ hơn 768px (Tablet dọc/Mobile) */
@media (max-width: 768px) {
    .app-main {
        grid-template-columns: 1fr; /* 1 Cột duy nhất */
        padding: 10px;
    }
    
    .sidebar {
        grid-column: 1 / 2;
        order: 1;
        max-height: 400px; /* Giới hạn chiều cao trên mobile */
    }

    .main-content {
        grid-column: 1 / 2;
        order: 2;
        gap: 10px;
    }
    
    .control-panel {
        grid-column: 1 / 2;
        order: 3;
    }

    .topbar {
        flex-direction: column;
        gap: 10px;
        align-items: flex-start;
    }
    .topbar .controls {
        flex-wrap: wrap;
    }
    
    .details-grid {
        grid-template-columns: 1fr;
    }

    .chart-grid {
        grid-template-columns: 1fr;
        gap: 10px;
    }

    .health-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }

    .detail-grid {
        grid-template-columns: 1fr;
    }
}