/* ==============================================================================
   ServerMon Pro - Modern Dark UI Design System
   ============================================================================== */

:root {
    --bg-main: #0B0F17;
    --bg-card: #121824;
    --bg-card-hover: #182132;
    --bg-card-alt: #161F2E;
    --border-color: #1E293B;
    --border-subtle: #273549;

    --text-primary: #F8FAFC;
    --text-secondary: #94A3B8;
    --text-muted: #64748B;

    --accent-blue: #38BDF8;
    --accent-blue-hover: #0EA5E9;
    --accent-blue-glow: rgba(56, 189, 248, 0.15);

    --success: #10B981;
    --success-bg: rgba(16, 185, 129, 0.12);
    --warning: #F59E0B;
    --warning-bg: rgba(245, 158, 11, 0.12);
    --danger: #EF4444;
    --danger-bg: rgba(239, 68, 68, 0.12);

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-full: 9999px;

    --font-sans: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ================= Top Navigation Bar ================= */
.navbar {
    background-color: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    padding: 14px 28px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
}

.brand-badge {
    font-size: 0.65rem;
    padding: 2px 6px;
    background: var(--accent-blue-glow);
    color: var(--accent-blue);
    border: 1px solid rgba(56, 189, 248, 0.3);
    border-radius: var(--radius-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

/* ================= Layout & Containers ================= */
.main-container {
    max-width: 1440px;
    width: 100%;
    margin: 0 auto;
    padding: 28px 24px;
    flex: 1;
}

/* ================= Stat Summary Cards ================= */
.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-color);
    border-radius: var(--radius-lg);
    padding: 18px 20px;
    display: flex;
    align-items: center;
    gap: 16px;
    transition: var(--transition);
}

.stat-card:hover {
    border-color: var(--border-subtle);
    transform: translateY(-2px);
}

.stat-icon-box {
    width: 46px;
    height: 46px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
}

.icon-blue { background: rgba(56, 189, 248, 0.12); color: var(--accent-blue); }
.icon-green { background: var(--success-bg); color: var(--success); }
.icon-yellow { background: var(--warning-bg); color: var(--warning); }
.icon-red { background: var(--danger-bg); color: var(--danger); }

.stat-info .stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
}

.stat-info .stat-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* ================= Control Toolbar ================= */
.toolbar {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 14px 18px;
    margin-bottom: 24px;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 14px;
}

.toolbar-left, .toolbar-right {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.search-input-wrap {
    position: relative;
    min-width: 260px;
}

.search-icon {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
}

.search-input {
    width: 100%;
    background: var(--bg-main);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 8px 12px 8px 36px;
    color: var(--text-primary);
    font-size: 0.88rem;
    outline: none;
    transition: var(--transition);
}

.search-input:focus {
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 2px var(--accent-blue-glow);
}

.filter-select {
    background: var(--bg-main);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 8px 12px;
    color: var(--text-primary);
    font-size: 0.88rem;
    outline: none;
    cursor: pointer;
}

/* ================= Device Grid ================= */
.devices-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
    gap: 20px;
}

.device-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 20px;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.device-card:hover {
    border-color: var(--border-subtle);
    background: var(--bg-card-hover);
    box-shadow: 0 8px 24px -6px rgba(0, 0, 0, 0.4);
}

.device-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 14px;
}

.device-identity {
    display: flex;
    align-items: center;
    gap: 12px;
}

.platform-avatar {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    background: var(--bg-main);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
}

.device-name {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.device-tags {
    display: flex;
    gap: 4px;
    margin-top: 2px;
}

.tag-badge {
    font-size: 0.7rem;
    padding: 1px 6px;
    background: var(--bg-main);
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
}

.status-pill {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 4px 10px;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.status-pill.online {
    background: var(--success-bg);
    color: var(--success);
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.status-pill.warning {
    background: var(--warning-bg);
    color: var(--warning);
    border: 1px solid rgba(245, 158, 11, 0.2);
}

.status-pill.offline {
    background: var(--danger-bg);
    color: var(--danger);
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.pulse-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: currentColor;
}

.status-pill.online .pulse-dot {
    box-shadow: 0 0 8px currentColor;
}

/* Device Network & Info */
.device-meta {
    background: var(--bg-main);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 10px 12px;
    margin-bottom: 16px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    font-family: var(--font-mono);
    font-size: 0.8rem;
}

.meta-item {
    display: flex;
    flex-direction: column;
}

.meta-label {
    font-size: 0.68rem;
    color: var(--text-muted);
    font-family: var(--font-sans);
    text-transform: uppercase;
}

.meta-val {
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* Telemetry Gauges */
.metrics-section {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 16px;
}

.metric-bar-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.metric-bar-header {
    display: flex;
    justify-content: space-between;
    font-size: 0.78rem;
    color: var(--text-secondary);
}

.metric-progress {
    width: 100%;
    height: 6px;
    background: var(--bg-main);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    border-radius: var(--radius-full);
    transition: width 0.4s ease;
}

.fill-cpu { background: #38BDF8; }
.fill-ram { background: #818CF8; }
.fill-disk { background: #34D399; }
.fill-warn { background: #F59E0B !important; }
.fill-danger { background: #EF4444 !important; }

/* Device Actions Footer */
.device-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 14px;
    border-top: 1px solid var(--border-color);
    gap: 8px;
}

.action-buttons {
    display: flex;
    gap: 6px;
}

.btn-icon {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    background: var(--bg-main);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.btn-icon:hover {
    color: var(--text-primary);
    border-color: var(--accent-blue);
    background: var(--accent-blue-glow);
}

/* ================= Buttons ================= */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 8px 16px;
    font-size: 0.88rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.btn-primary {
    background: var(--accent-blue);
    color: #03131E;
}

.btn-primary:hover {
    background: var(--accent-blue-hover);
    box-shadow: 0 0 16px var(--accent-blue-glow);
}

.btn-secondary {
    background: var(--bg-card-alt);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

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

.btn-danger {
    background: var(--danger-bg);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: var(--danger);
}

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

.btn-sm {
    padding: 5px 10px;
    font-size: 0.78rem;
}

.btn-block {
    width: 100%;
}

/* ================= Auth Screens ================= */
.auth-body {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: radial-gradient(circle at top, #162032 0%, var(--bg-main) 70%);
}

.auth-container {
    width: 100%;
    max-width: 420px;
    padding: 20px;
}

.auth-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.5);
}

.brand-header {
    text-align: center;
    margin-bottom: 24px;
}

.brand-icon {
    width: 54px;
    height: 54px;
    background: var(--accent-blue-glow);
    border: 1px solid rgba(56, 189, 248, 0.3);
    border-radius: var(--radius-md);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-blue);
    margin-bottom: 12px;
}

.brand-header h2 {
    font-size: 1.4rem;
    font-weight: 700;
}

.brand-header p {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.form-input, .form-textarea, .form-select {
    width: 100%;
    background: var(--bg-main);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 10px 14px;
    color: var(--text-primary);
    font-size: 0.9rem;
    font-family: inherit;
    outline: none;
    transition: var(--transition);
}

.form-input:focus, .form-textarea:focus, .form-select:focus {
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 2px var(--accent-blue-glow);
}

.form-textarea {
    resize: vertical;
    min-height: 80px;
}

.input-readonly {
    background: #0d121c;
    color: var(--text-muted);
    cursor: not-allowed;
}

.form-group small {
    display: block;
    margin-top: 4px;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

/* Alerts */
.alert {
    padding: 12px 16px;
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    margin-bottom: 18px;
}

.alert-success {
    background: var(--success-bg);
    border: 1px solid rgba(16, 185, 129, 0.3);
    color: var(--success);
}

.alert-danger {
    background: var(--danger-bg);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: var(--danger);
}

.alert-info {
    background: var(--accent-blue-glow);
    border: 1px solid rgba(56, 189, 248, 0.3);
    color: var(--accent-blue);
}

/* ================= Modal Backdrop & Dialog ================= */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(4, 7, 12, 0.8);
    backdrop-filter: blur(4px);
    display: none;
    align-items: center;
    justify-content: center;
    padding: 20px;
    z-index: 1000;
}

.modal-overlay.active {
    display: flex;
}

.modal-dialog {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6);
    animation: modalPop 0.2s ease-out;
}

.modal-dialog-large {
    max-width: 780px;
}

@keyframes modalPop {
    from { opacity: 0; transform: scale(0.96); }
    to { opacity: 1; transform: scale(1); }
}

.modal-header {
    padding: 18px 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    font-size: 1.15rem;
    font-weight: 700;
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.4rem;
    cursor: pointer;
    padding: 4px;
}

.modal-close:hover {
    color: var(--text-primary);
}

.modal-body {
    padding: 24px;
}

.modal-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

/* Code Snippet Boxes */
.code-box {
    background: var(--bg-main);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 14px;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: #38BDF8;
    position: relative;
    overflow-x: auto;
    white-space: pre-wrap;
    word-break: break-all;
    margin: 10px 0;
}

.btn-copy {
    position: absolute;
    top: 8px;
    right: 8px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    font-size: 0.72rem;
    cursor: pointer;
}

.btn-copy:hover {
    color: var(--text-primary);
    border-color: var(--accent-blue);
}

/* Tabs */
.tabs-nav {
    display: flex;
    gap: 8px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 18px;
}

.tab-btn {
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    padding: 8px 14px;
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.88rem;
    cursor: pointer;
    transition: var(--transition);
}

.tab-btn.active {
    color: var(--accent-blue);
    border-bottom-color: var(--accent-blue);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* Responsive */
@media (max-width: 768px) {
    .devices-grid {
        grid-template-columns: 1fr;
    }
    .toolbar {
        flex-direction: column;
        align-items: stretch;
    }
    .search-input-wrap {
        min-width: 100%;
    }
    .form-row {
        grid-template-columns: 1fr;
    }
}