:root {
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #17a2b8;
    --light-color: #f8f9fa;
    --dark-color: #1f2937;
    --bg-color: #f0f2f5;
    --card-bg: #ffffff;
    --text-color: #333;
    --text-muted: #6c757d;
    --border-color: #d1d5db;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    --border-radius: 8px;
    --font-family-poppins: 'Poppins', sans-serif;
    --font-family-system: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

*, *::before, *::after {
    box-sizing: border-box;
}

/* Tải font Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;600&display=swap');

/* --- Cấu hình chung và Typography --- */
body {
    font-family: var(--font-family-poppins), var(--font-family-system);
    margin: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

h1, h2, h3 {
    color: var(--dark-color);
    margin-top: 0;
    margin-bottom: 1rem;
    font-weight: 600;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 1.75rem; margin-top: 0; border-bottom: 1px solid var(--border-color); padding-bottom: 0.5rem; }
h3 { font-size: 1.25rem; }

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

/* --- Login Page --- */
.login-body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: var(--bg-color);
}

.login-wrapper {
    background: linear-gradient(135deg, #e6e9f0 0%, #dbe0e7 100%);
    border-radius: 15px;
    padding: 2.5rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    animation: fadeIn 0.8s ease-in-out;
    width: 100%;
    max-width: 400px;
    text-align: center;
}

.login-title {
    font-size: 2rem;
    font-weight: 600;
    color: var(--dark-color);
    margin-bottom: 2rem;
}

.error-message {
    background-color: #fef2f2;
    color: #ef4444;
    padding: 0.75rem 1rem;
    border: 1px solid #fca5a5;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
    font-weight: 500;
    opacity: 0;
    animation: fadeAndSlideIn 0.5s forwards 0.2s;
}

/* --- Admin Page --- */
.admin-body {
    background-color: var(--bg-color);
    display: block;
    min-height: 100vh;
}

/* Header */
.main-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
}

.main-header .logo a {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--dark-color);
    text-decoration: none;
}

.main-header .nav-links a {
    margin-left: 1.5rem;
    color: var(--text-color);
    font-weight: 500;
}

.main-header .nav-links a:hover {
    color: var(--primary-color);
    text-decoration: none;
}

/* Top Navigation Menu */
.top-menu {
    background-color: var(--card-bg);
    padding: 0 2rem;
    display: flex;
    gap: 1rem;
    border-bottom: 1px solid var(--border-color);
}
.top-menu a {
    color: var(--text-muted);
    text-decoration: none;
    padding: 1rem 1.5rem;
    font-weight: 500;
    border-bottom: 3px solid transparent;
    transition: color 0.2s, border-color 0.2s;
}
.top-menu a:hover {
    color: var(--primary-color);
}
.top-menu a.active {
    color: var(--primary-color);
    font-weight: 600;
    border-bottom-color: var(--primary-color);
}

/* Card Base */
.card {
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    padding: 1.5rem;
    margin-bottom: 2rem;
}

/* Form Styling (chung cho cả 2 trang) */
.form-card h2 {
    margin-top: 0;
    border-bottom: none;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.form-group {
    margin-bottom: 1.5rem;
    text-align: left;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.form-group input:not([type="checkbox"]),
.form-group select {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    background-color: var(--light-color);
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.form-group input:not([type="checkbox"]):focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.2);
}

/* Slider Styling */
.form-group label[for="cpu_limit"],
.form-group label[for="ram_limit_mb"] {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.form-group output {
    font-weight: 600;
    color: var(--primary-color);
    background-color: #eef2f5;
    padding: 2px 8px;
    border-radius: 4px;
    font-family: 'Courier New', Courier, monospace;
}

input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 8px;
    background: var(--border-color);
    border-radius: 5px;
    outline: none;
    opacity: 0.7;
    transition: opacity .2s;
    margin-top: 0.5rem;
}

input[type="range"]:hover {
    opacity: 1;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    background: var(--primary-color);
    cursor: pointer;
    border-radius: 50%;
    border: 2px solid var(--card-bg);
    box-shadow: 0 0 5px rgba(0,0,0,0.2);
}

input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: var(--primary-color);
    cursor: pointer;
    border-radius: 50%;
    border: 2px solid var(--card-bg);
    box-shadow: 0 0 5px rgba(0,0,0,0.2);
}

/* Button Styling (chung cho cả 2 trang) */
.btn {
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    border-radius: 8px;
    border: 1px solid transparent;
    transition: all 0.2s ease-in-out;
    text-decoration: none;
    display: inline-block;
    background-color: var(--secondary-color);
    color: #fff;
    text-align: center;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

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

.btn-logout { background-color: var(--danger-color); }
.btn-logout:hover { background-color: #c82333; }

.login-button {
    width: 100%;
    padding: 0.75rem 1rem;
    background-color: var(--primary-color);
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease;
}

.login-button:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
}

/* Icon Buttons */
.btn-icon {
    width: 36px;
    height: 36px;
    padding: 0;
    font-size: 1.2rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    transition: all 0.2s ease-in-out;
}
.btn-icon:hover { 
    color: #fff; 
}
.btn-icon::before {
    font-family: 'Arial', sans-serif; 
    font-weight: bold;
}
.btn-icon:hover::before {
    color: #fff;
}

.btn-start { border-color: var(--success-color); }
.btn-start:hover { background-color: var(--success-color); border-color: var(--success-color); }
.btn-start::before { content: '▶'; color: var(--success-color); font-size: 0.8em; }

.btn-stop { border-color: var(--warning-color); }
.btn-stop:hover { background-color: var(--warning-color); border-color: var(--warning-color); }
.btn-stop::before { content: '■'; color: var(--warning-color); }

.btn-restart { border-color: var(--info-color); }
.btn-restart:hover { background-color: var(--info-color); border-color: var(--info-color); }
.btn-restart::before { content: '↻'; color: var(--info-color); }

.btn-edit { border-color: var(--primary-color); }
.btn-edit:hover { background-color: var(--primary-color); border-color: var(--primary-color); }
.btn-edit::before { content: '✎'; color: var(--primary-color); }

.btn-delete { border-color: var(--danger-color); }
.btn-delete:hover { background-color: var(--danger-color); border-color: var(--danger-color); }
.btn-delete::before { content: '×'; color: var(--danger-color); }

.btn-view-user { border-color: var(--info-color); }
.btn-view-user:hover { background-color: var(--info-color); border-color: var(--info-color); }
.btn-view-user::before { content: 'ⓘ'; color: var(--info-color); font-size: 1.1em; line-height: 1; }
.btn-view-user:hover::before { color: #fff; }

/* Status Indicators */
.status {
    padding: 0.25rem 0.6rem;
    border-radius: 9999px;
    color: #fff;
    font-weight: 600;
    font-size: 0.75rem;
    text-transform: capitalize;
    display: inline-block;
    line-height: 1.2;
}
.status-running, .status-used { background-color: var(--success-color); }
.status-stopped { background-color: var(--secondary-color); }
.status-error, .status-failed { background-color: var(--danger-color); }
.status-unknown { background-color: var(--warning-color); }
.status-created, .status-restarting, .status-processing { background-color: var(--info-color); }
.status-removing, .status-paused { background-color: var(--warning-color); }
.status-dead { background-color: var(--danger-color); }

/* User List Table */
.user-list-card table {
    width: 100%;
    border-collapse: collapse;
}
.user-list-card th, .user-list-card td {
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
    vertical-align: middle;
}
.user-list-card th {
    background-color: var(--light-color);
}

/* Modal Styling */
.modal {
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    display: none;
    justify-content: center;
    align-items: center;
}

.modal-content {
    background-color: var(--card-bg);
    padding: 2.5rem;
    border-radius: var(--border-radius);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
    width: 90%;
    max-width: 500px;
    position: relative;
}

.close-btn {
    color: #aaa;
    font-size: 2rem;
    font-weight: bold;
    position: absolute;
    top: 1rem;
    right: 1.5rem;
    cursor: pointer;
}
.close-btn:hover { color: var(--dark-color); }

/* Progress Modal Styling */
.progress-modal-content {
    width: 90%;
    max-width: 600px;
}

#progress-log {
    background-color: #2d333b;
    color: #cdd9e5;
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.9rem;
    padding: 1rem;
    border-radius: 5px;
    height: 300px;
    overflow-y: auto;
    white-space: pre-wrap;
    border: 1px solid var(--border-color);
}

#progress-log p {
    margin: 0 0 0.5rem 0;
    padding: 0;
    line-height: 1.4;
}

/* --- Admin Dashboard --- */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}
.stat-card {
    background-color: var(--card-bg);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    gap: 1rem;
}
.stat-icon {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background-size: 60%;
    background-repeat: no-repeat;
    background-position: center;
}
.icon-services { background-color: #e0e7ff; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%234f46e5' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Crect x='2' y='2' width='20' height='8' rx='2' ry='2'%3E%3C/rect%3E%3Crect x='2' y='14' width='20' height='8' rx='2' ry='2'%3E%3C/rect%3E%3Cline x1='6' y1='6' x2='6.01' y2='6'%3E%3C/line%3E%3Cline x1='6' y1='18' x2='6.01' y2='18'%3E%3C/line%3E%3C/svg%3E"); }
.icon-users { background-color: #d1fae5; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23059669' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M17 21v-2a4 4 0 0 0-4-4H5a4 4 0 0 0-4 4v2'%3E%3C/path%3E%3Ccircle cx='9' cy='7' r='4'%3E%3C/circle%3E%3Cpath d='M23 21v-2a4 4 0 0 0-3-3.87'%3E%3C/path%3E%3Cpath d='M16 3.13a4 4 0 0 1 0 7.75'%3E%3C/path%3E%3C/svg%3E"); }
.icon-running { background-color: #dcfce7; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%2322c55e' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='23 6 13.5 15.5 8.5 10.5 1 18'%3E%3C/polyline%3E%3Cpolyline points='17 6 23 6 23 12'%3E%3C/polyline%3E%3C/svg%3E"); }
.icon-stopped { background-color: #fee2e2; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23ef4444' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Ccircle cx='12' cy='12' r='10'%3E%3C/circle%3E%3Crect x='9' y='9' width='6' height='6'%3E%3C/rect%3E%3C/svg%3E"); }

.stat-info h3 { font-size: 0.9rem; color: var(--text-muted); margin-bottom: 0.25rem; font-weight: 500; }
.stat-number { font-size: 1.75rem; font-weight: 700; color: var(--dark-color); line-height: 1; }

.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 1.5rem;
}
.chart-card {
    height: 350px;
    display: flex;
    flex-direction: column;
}
.pie-chart-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    flex-grow: 1;
}
.pie-chart {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    background: conic-gradient(
        var(--success-color) 0% var(--p-running),
        var(--secondary-color) var(--p-running) calc(var(--p-running) + var(--p-stopped)),
        var(--danger-color) calc(var(--p-running) + var(--p-stopped)) 100%
    );
}
.chart-legend { display: flex; flex-direction: column; gap: 1rem; }
.legend-item { display: flex; flex-direction: column; }
.legend-item::before { display: none; }
.legend-item strong { font-size: 1.5rem; font-weight: 700; line-height: 1; }
.legend-item span { font-size: 0.9rem; color: var(--text-muted); }
.legend-item.running strong { color: var(--success-color); }
.legend-item.stopped strong { color: var(--secondary-color); }
.legend-item.error strong { color: var(--danger-color); }

.bar-chart-container {
    display: flex;
    flex-grow: 1;
    padding-left: 1rem;
    padding-bottom: 1.5rem;
    position: relative;
}
.y-axis-labels {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    font-size: 0.8rem;
    color: var(--text-muted);
    text-align: right;
    padding-right: 0.5rem;
}
.bar-chart {
    flex-grow: 1;
    border-left: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-around;
    align-items: flex-end;
    gap: 1rem;
    padding: 0 1rem;
}
.bar-item {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    height: 100%;
    justify-content: flex-end;
}
.bar {
    width: 70%;
    max-width: 35px;
    background-color: var(--primary-color);
    border-radius: 4px 4px 0 0;
    transition: height 0.5s ease-out;
    animation: bar-grow 0.8s ease-out;
}
.bar:hover { background-color: var(--primary-hover); }
.bar-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
    white-space: nowrap;
}
@keyframes bar-grow {
    from { height: 0; }
}

.recent-activity-table {
    width: 100%;
    border-collapse: collapse;
}
.recent-activity-table th, .recent-activity-table td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}
.recent-activity-table th {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-muted);
}