/* ======================================
   VPS MANAGER WEB - Modern Light Theme
   ====================================== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
    --bg-primary: #f0f2f5;
    --bg-secondary: #ffffff;
    --bg-card: #ffffff;
    --bg-glass: rgba(0, 0, 0, 0.02);
    --bg-hover: rgba(0, 0, 0, 0.04);
    --bg-sidebar: #ffffff;
    --border: rgba(0, 0, 0, 0.08);
    --border-light: rgba(0, 0, 0, 0.12);
    --text-primary: #1a1a2e;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --accent: #4f46e5;
    --accent-hover: #4338ca;
    --accent-glow: rgba(79, 70, 229, 0.15);
    --accent-light: rgba(79, 70, 229, 0.08);
    --success: #059669;
    --success-bg: rgba(5, 150, 105, 0.1);
    --danger: #dc2626;
    --danger-bg: rgba(220, 38, 38, 0.08);
    --warning: #d97706;
    --warning-bg: rgba(217, 119, 6, 0.08);
    --purple: #7c3aed;
    --cyan: #0891b2;
    --sidebar-width: 260px;
    --radius: 14px;
    --radius-sm: 10px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.07);
    --shadow-lg: 0 10px 30px rgba(0,0,0,0.08);
    --shadow-xl: 0 20px 50px rgba(0,0,0,0.1);
    --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
}

/* ======= SCROLLBAR ======= */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(0,0,0,0.12); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(0,0,0,0.2); }

/* ======= LOGIN OVERLAY ======= */
.login-overlay {
    position: fixed; inset: 0; z-index: 1000;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex; align-items: center; justify-content: center;
}

.login-card {
    background: #ffffff;
    border: none;
    border-radius: 24px;
    padding: 48px 40px;
    width: 440px;
    box-shadow: 0 25px 60px rgba(0,0,0,0.2);
    animation: loginFadeIn 0.6s ease;
}

@keyframes loginFadeIn {
    from { opacity: 0; transform: translateY(30px) scale(0.95); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.login-card h1 {
    font-size: 28px; font-weight: 800;
    background: linear-gradient(135deg, #4f46e5, #7c3aed);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    margin-bottom: 8px; text-align: center;
}

.login-card .subtitle {
    color: var(--text-muted); text-align: center;
    margin-bottom: 32px; font-size: 14px;
}

.login-card .logo-icon {
    width: 64px; height: 64px; margin: 0 auto 20px;
    background: linear-gradient(135deg, #4f46e5, #7c3aed);
    border-radius: 18px; display: flex; align-items: center; justify-content: center;
    font-size: 28px; box-shadow: 0 8px 30px rgba(79,70,229,0.3);
}

/* ======= FORM ELEMENTS ======= */
.form-group { margin-bottom: 20px; }

.form-group label {
    display: block; font-size: 13px; font-weight: 600;
    color: var(--text-secondary); margin-bottom: 6px;
}

.form-group input, .form-group select, .form-group textarea {
    width: 100%; padding: 12px 16px;
    background: var(--bg-primary);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: inherit; font-size: 14px;
    transition: var(--transition);
    outline: none;
}

.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
    background: #fff;
}

.form-group input::placeholder { color: var(--text-muted); }

.form-row { display: flex; gap: 12px; }
.form-row .form-group { flex: 1; }

/* ======= BUTTONS ======= */
.btn {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 10px 20px;
    border: none; border-radius: var(--radius-sm);
    font-family: inherit; font-size: 13px; font-weight: 600;
    cursor: pointer; transition: var(--transition);
    text-decoration: none;
}

.btn-primary { background: var(--accent); color: white; }
.btn-primary:hover { background: var(--accent-hover); box-shadow: 0 4px 16px var(--accent-glow); transform: translateY(-1px); }
.btn-success { background: var(--success); color: white; }
.btn-success:hover { background: #047857; transform: translateY(-1px); }
.btn-danger { background: var(--danger); color: white; }
.btn-danger:hover { background: #b91c1c; }
.btn-warning { background: var(--warning); color: white; }
.btn-warning:hover { background: #b45309; }
.btn-ghost { background: var(--bg-primary); color: var(--text-secondary); border: 1.5px solid var(--border); }
.btn-ghost:hover { background: var(--bg-hover); color: var(--text-primary); border-color: var(--border-light); }
.btn-sm { padding: 6px 12px; font-size: 12px; border-radius: 8px; }
.btn-lg { padding: 14px 28px; font-size: 15px; }
.btn-block { width: 100%; justify-content: center; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none !important; }

.btn-icon {
    width: 36px; height: 36px; padding: 0;
    display: inline-flex; align-items: center; justify-content: center;
    border-radius: var(--radius-sm);
    background: var(--bg-primary); border: 1.5px solid var(--border);
    color: var(--text-secondary); cursor: pointer;
    transition: var(--transition);
}
.btn-icon:hover { background: var(--bg-hover); color: var(--text-primary); }

/* ======= LAYOUT ======= */
.app-container {
    display: flex; height: 100vh; width: 100vw;
}

/* ======= SIDEBAR ======= */
.sidebar {
    width: var(--sidebar-width); min-width: var(--sidebar-width);
    background: var(--bg-sidebar);
    border-right: 1.5px solid var(--border);
    display: flex; flex-direction: column;
    z-index: 100;
    box-shadow: 2px 0 8px rgba(0,0,0,0.03);
}

.sidebar-header {
    padding: 24px 20px 16px;
    border-bottom: 1.5px solid var(--border);
}

.sidebar-header .app-name {
    font-size: 18px; font-weight: 800;
    background: linear-gradient(135deg, var(--accent), var(--purple));
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    display: flex; align-items: center; gap: 10px;
}

.sidebar-header .app-name .icon {
    width: 34px; height: 34px;
    background: linear-gradient(135deg, var(--accent), var(--purple));
    border-radius: 10px; display: flex; align-items: center; justify-content: center;
    font-size: 16px; -webkit-text-fill-color: white;
    box-shadow: 0 4px 12px var(--accent-glow);
}

.sidebar-nav {
    flex: 1; overflow-y: auto;
    padding: 8px 0;
}

.nav-section-title {
    padding: 16px 20px 6px;
    font-size: 11px; font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase; letter-spacing: 1.5px;
}

.nav-item {
    display: flex; align-items: center; gap: 12px;
    padding: 11px 20px;
    color: var(--text-secondary);
    font-size: 13.5px; font-weight: 500;
    cursor: pointer; transition: var(--transition);
    border-left: 3px solid transparent;
    position: relative;
    margin: 1px 8px;
    border-radius: 10px;
    border-left: none;
}

.nav-item:hover {
    background: var(--bg-primary);
    color: var(--text-primary);
}

.nav-item.active {
    background: var(--accent-light);
    color: var(--accent);
    font-weight: 600;
}

.nav-item .nav-icon { font-size: 16px; width: 20px; text-align: center; }

.sidebar-footer {
    padding: 16px 20px;
    border-top: 1.5px solid var(--border);
}

.connection-status {
    display: flex; align-items: center; gap: 8px;
    font-size: 12px; color: var(--text-muted);
}

.connection-status .dot {
    width: 8px; height: 8px; border-radius: 50%;
    background: var(--danger);
    box-shadow: 0 0 6px var(--danger);
}

.connection-status.connected .dot {
    background: var(--success);
    box-shadow: 0 0 6px var(--success);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* ======= MAIN CONTENT ======= */
.main-content {
    flex: 1; overflow-y: auto;
    background: var(--bg-primary);
    padding: 0;
}

.page { display: none; padding: 28px 32px; animation: fadeIn 0.3s ease; }
.page.active { display: block; }

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

.page-header {
    display: flex; align-items: center; justify-content: space-between;
    margin-bottom: 24px;
}

.page-header h2 {
    font-size: 22px; font-weight: 700;
    display: flex; align-items: center; gap: 10px;
    color: var(--text-primary);
}

.page-header h2 .icon { font-size: 24px; }

.page-header .actions { display: flex; gap: 8px; }

/* ======= CARDS ======= */
.card {
    background: var(--bg-card);
    border: 1.5px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.card:hover { border-color: var(--border-light); box-shadow: var(--shadow-md); }

.card-header {
    display: flex; align-items: center; justify-content: space-between;
    margin-bottom: 16px;
}

.card-title {
    font-size: 14px; font-weight: 600;
    color: var(--text-secondary);
}

/* ======= STATS GRID ======= */
.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: 1.5px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    position: relative; overflow: hidden;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.stat-card:hover { border-color: var(--accent); transform: translateY(-3px); box-shadow: var(--shadow-lg); }

.stat-card .stat-icon {
    width: 44px; height: 44px; border-radius: 12px;
    display: flex; align-items: center; justify-content: center;
    font-size: 20px; margin-bottom: 12px;
}

.stat-card .stat-value {
    font-size: 24px; font-weight: 700;
    margin-bottom: 4px; color: var(--text-primary);
}

.stat-card .stat-label {
    font-size: 13px; color: var(--text-muted);
}

.stat-card .stat-glow {
    position: absolute; top: -30px; right: -30px;
    width: 80px; height: 80px; border-radius: 50%;
    opacity: 0.08; filter: blur(20px);
}

/* ======= PROGRESS BAR ======= */
.progress-bar {
    width: 100%; height: 8px;
    background: var(--bg-primary);
    border-radius: 4px; overflow: hidden;
    margin: 8px 0;
}

.progress-bar .fill {
    height: 100%; border-radius: 4px;
    transition: width 0.5s ease;
    background: linear-gradient(90deg, #4f46e5, #7c3aed);
}

.progress-bar .fill.success { background: linear-gradient(90deg, #059669, #34d399); }
.progress-bar .fill.warning { background: linear-gradient(90deg, #d97706, #fbbf24); }
.progress-bar .fill.danger { background: linear-gradient(90deg, #dc2626, #f87171); }

.progress-info {
    display: flex; justify-content: space-between;
    font-size: 12px; color: var(--text-muted);
}

/* ======= TABLE ======= */
.table-container { overflow-x: auto; }

table {
    width: 100%; border-collapse: collapse;
    font-size: 13px;
}

table th {
    padding: 12px 16px; text-align: left;
    font-weight: 600; font-size: 12px;
    color: var(--text-muted); text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 1.5px solid var(--border);
    background: var(--bg-primary);
}

table td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
    color: var(--text-secondary);
}

table tr:hover td { background: var(--accent-light); color: var(--text-primary); }

table .status-badge {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 4px 10px; border-radius: 20px;
    font-size: 12px; font-weight: 600;
}

.status-badge.online { background: var(--success-bg); color: var(--success); }
.status-badge.offline { background: var(--danger-bg); color: var(--danger); }
.status-badge.warning { background: var(--warning-bg); color: var(--warning); }

/* ======= MODAL ======= */
.modal-overlay {
    position: fixed; inset: 0; z-index: 500;
    background: rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(6px);
    display: flex; align-items: center; justify-content: center;
    animation: fadeIn 0.2s ease;
}

.modal {
    background: #ffffff;
    border: 1.5px solid var(--border);
    border-radius: 20px;
    padding: 32px;
    width: 500px; max-width: 95vw;
    max-height: 80vh; overflow-y: auto;
    box-shadow: var(--shadow-xl);
    animation: modalIn 0.3s ease;
}

@keyframes modalIn {
    from { opacity: 0; transform: scale(0.9) translateY(20px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-lg { width: 700px; }
.modal-xl { width: 900px; max-height: 85vh; }

.modal h3 {
    font-size: 18px; font-weight: 700;
    margin-bottom: 20px;
    display: flex; align-items: center; gap: 10px;
    color: var(--text-primary);
}

.modal-actions {
    display: flex; justify-content: flex-end; gap: 8px;
    margin-top: 24px;
    padding-top: 16px;
    border-top: 1.5px solid var(--border);
}

/* ======= TERMINAL ======= */
.terminal-container {
    background: #1e1e2e;
    border: 1.5px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden; height: calc(100vh - 160px);
    box-shadow: var(--shadow-md);
}

.terminal-container .xterm { padding: 8px; }

/* ======= FILE MANAGER ======= */
.file-manager {
    display: flex; flex-direction: column;
    height: calc(100vh - 140px);
}

.file-toolbar {
    display: flex; align-items: center; gap: 8px;
    padding: 12px 0; margin-bottom: 12px;
}

.file-toolbar .path-input {
    flex: 1; padding: 10px 16px;
    background: #ffffff;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px; outline: none;
    box-shadow: var(--shadow-sm);
}

.file-toolbar .path-input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-glow); }

.file-list {
    flex: 1; overflow-y: auto;
}

.file-item {
    display: grid; grid-template-columns: 1fr 100px 150px 100px;
    gap: 12px; padding: 10px 16px;
    border-bottom: 1px solid var(--border);
    cursor: pointer; transition: var(--transition);
    font-size: 13px; align-items: center;
    border-radius: 8px;
    margin: 1px 0;
}

.file-item:hover { background: var(--accent-light); }

.file-item .file-name {
    display: flex; align-items: center; gap: 10px;
    color: var(--text-primary); font-weight: 500;
}

.file-item .file-name .icon { font-size: 16px; }

.file-item .file-meta { color: var(--text-muted); font-size: 12px; }

/* ======= CONTEXT MENU ======= */
.context-menu {
    position: fixed; z-index: 600;
    background: #ffffff;
    border: 1.5px solid var(--border);
    border-radius: 12px;
    padding: 6px;
    min-width: 200px;
    box-shadow: var(--shadow-xl);
    animation: fadeIn 0.15s ease;
}

.context-menu-item {
    display: flex; align-items: center; gap: 10px;
    padding: 9px 14px;
    border-radius: 8px;
    font-size: 13px; color: var(--text-secondary);
    cursor: pointer; transition: var(--transition);
}

.context-menu-item:hover { background: var(--accent); color: white; }
.context-menu-separator { height: 1px; background: var(--border); margin: 4px 0; }

/* ======= EDITOR ======= */
.code-editor {
    width: 100%; min-height: 400px;
    background: #1e1e2e; color: #cdd6f4;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 16px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px; line-height: 1.6;
    resize: vertical; outline: none;
    tab-size: 4;
    box-shadow: var(--shadow-md);
}

/* ======= SERVICE CARDS ======= */
.services-grid {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
}

.service-card {
    background: var(--bg-card);
    border: 1.5px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    display: flex; align-items: center; gap: 16px;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.service-card:hover { border-color: var(--accent); transform: translateY(-2px); box-shadow: var(--shadow-md); }

.service-card .service-icon {
    width: 48px; height: 48px; border-radius: 12px;
    display: flex; align-items: center; justify-content: center;
    font-size: 22px;
    background: var(--accent-light); border: 1.5px solid var(--border);
}

.service-card .service-info { flex: 1; }
.service-card .service-info h4 { font-size: 14px; font-weight: 600; margin-bottom: 4px; }
.service-card .service-info .status { font-size: 12px; color: var(--text-muted); }

.service-card .service-actions { display: flex; gap: 6px; }

/* ======= QUICK INSTALL CARDS ======= */
.script-cards {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 16px;
}

.script-card {
    background: var(--bg-card);
    border: 1.5px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.script-card:hover { border-color: var(--accent); transform: translateY(-3px); box-shadow: var(--shadow-lg); }

.script-card .script-header {
    display: flex; align-items: center; gap: 12px; margin-bottom: 12px;
}

.script-card .script-icon {
    width: 40px; height: 40px; border-radius: 10px;
    background: linear-gradient(135deg, var(--accent), var(--purple));
    display: flex; align-items: center; justify-content: center;
    font-weight: 800; font-size: 16px; color: white;
    box-shadow: 0 4px 12px var(--accent-glow);
}

.script-card .script-name { font-weight: 600; font-size: 15px; }
.script-card .script-desc { font-size: 12px; color: var(--text-muted); margin-bottom: 16px; line-height: 1.5; min-height: 36px; }
.script-card .script-actions { display: flex; gap: 8px; }

/* ======= LOG OUTPUT ======= */
.log-output {
    background: #1e1e2e;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 16px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px; line-height: 1.6;
    color: #cdd6f4;
    max-height: 300px; overflow-y: auto;
    white-space: pre-wrap;
}

/* ======= TOASTS ======= */
.toast-container {
    position: fixed; top: 20px; right: 20px;
    z-index: 9999; display: flex;
    flex-direction: column; gap: 8px;
}

.toast {
    background: #ffffff;
    border: 1.5px solid var(--border);
    border-radius: 12px;
    padding: 14px 20px;
    display: flex; align-items: center; gap: 10px;
    box-shadow: var(--shadow-lg);
    animation: toastIn 0.4s ease;
    min-width: 280px; font-size: 13px;
    color: var(--text-primary);
}

.toast.success { border-left: 4px solid var(--success); }
.toast.error { border-left: 4px solid var(--danger); }
.toast.warning { border-left: 4px solid var(--warning); }
.toast.info { border-left: 4px solid var(--accent); }

@keyframes toastIn {
    from { opacity: 0; transform: translateX(100%); }
    to { opacity: 1; transform: translateX(0); }
}

/* ======= CHECKBOX ======= */
.checkbox-label {
    display: flex; align-items: center; gap: 8px;
    cursor: pointer; font-size: 13px; color: var(--text-secondary);
}

.checkbox-label input[type="checkbox"] {
    width: 18px; height: 18px;
    accent-color: var(--accent);
}

/* ======= LOADING ======= */
.loading-spinner {
    display: inline-block;
    width: 20px; height: 20px;
    border: 2.5px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.page-loading {
    display: flex; align-items: center; justify-content: center;
    padding: 60px; color: var(--text-muted);
    gap: 12px; font-size: 14px;
}

/* ======= EMPTY STATE ======= */
.empty-state {
    display: flex; flex-direction: column;
    align-items: center; justify-content: center;
    padding: 60px 20px; color: var(--text-muted);
}

.empty-state .icon { font-size: 48px; margin-bottom: 16px; opacity: 0.5; }
.empty-state .title { font-size: 16px; font-weight: 600; margin-bottom: 8px; color: var(--text-secondary); }
.empty-state .desc { font-size: 13px; }

/* ======= RESPONSIVE ======= */
@media (max-width: 768px) {
    .sidebar { width: 60px; min-width: 60px; }
    .nav-item span { display: none; }
    .nav-section-title { display: none; }
    .sidebar-header .app-name span { display: none; }
    .sidebar-footer .connection-text { display: none; }
    .stats-grid { grid-template-columns: 1fr 1fr; }
    .page { padding: 16px; }
}

/* ======= MAIL TREE ======= */
.mail-tree { list-style: none; padding: 0; }
.mail-tree li {
    padding: 10px 16px; cursor: pointer;
    border-bottom: 1px solid var(--border);
    transition: var(--transition); font-size: 13px;
    border-radius: 8px; margin: 2px 0;
}
.mail-tree li:hover { background: var(--accent-light); }
.mail-tree li.active { background: var(--accent-light); color: var(--accent); }
.mail-tree .mail-user { padding-left: 36px; color: var(--text-muted); font-size: 12px; }

/* ======= TAB INSIDE PAGE ======= */
.tab-bar {
    display: flex; gap: 0;
    border-bottom: 1.5px solid var(--border);
    margin-bottom: 20px;
}

.tab-btn {
    padding: 10px 20px;
    font-size: 13px; font-weight: 500;
    color: var(--text-muted);
    background: none; border: none;
    border-bottom: 2.5px solid transparent;
    cursor: pointer; transition: var(--transition);
}

.tab-btn:hover { color: var(--text-primary); }
.tab-btn.active { color: var(--accent); border-bottom-color: var(--accent); font-weight: 600; }

/* ======= FILE DROPZONE ======= */
.file-dropzone {
    position: relative;
    min-height: 200px;
    transition: var(--transition);
}

.file-dropzone.drag-over {
    background: var(--accent-light);
    border: 2px dashed var(--accent);
    border-radius: var(--radius);
}

.file-dropzone.drag-over::after {
    content: '📤 Thả file để upload';
    position: absolute; inset: 0;
    display: flex; align-items: center; justify-content: center;
    font-size: 18px; font-weight: 600;
    color: var(--accent);
    background: rgba(255, 255, 255, 0.9);
    border-radius: var(--radius);
    z-index: 10;
    pointer-events: none;
}