:root {
    --bg-main: #0f172a;
    --bg-sidebar: #0b1120;
    --bg-card: #1e293b;
    --bg-card-hover: #243248;
    --bg-input: #0f172a;
    --border-color: #334155;
    --border-focus: #38bdf8;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --text-dim: #64748b;
    --accent: #38bdf8;
    --accent-hover: #0ea5e9;
    --success: #34d399;
    --success-bg: rgba(52, 211, 153, 0.1);
    --danger: #f87171;
    --danger-bg: rgba(248, 113, 113, 0.1);
    --warning: #fbbf24;
    --warning-bg: rgba(251, 191, 36, 0.1);
    --info: #60a5fa;
    --info-bg: rgba(96, 165, 250, 0.1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.5;
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 260px;
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.sidebar-header {
    padding: 24px 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 12px;
}

.sidebar-brand {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.025em;
    color: var(--text-main);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
}

.sidebar-brand .badge {
    font-size: 0.7rem;
    font-weight: 600;
    background-color: var(--accent);
    color: #0b1120;
    padding: 2px 6px;
    border-radius: 4px;
}

.sidebar-nav {
    list-style: none;
    padding: 16px 12px;
    flex-grow: 1;
    overflow-y: auto;
}

.sidebar-nav li {
    margin-bottom: 4px;
}

.sidebar-nav a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 14px;
    color: var(--text-muted);
    text-decoration: none;
    border-radius: 6px;
    font-size: 0.925rem;
    font-weight: 500;
    transition: all 0.15s ease-in-out;
}

.sidebar-nav a:hover {
    color: var(--text-main);
    background-color: var(--bg-card);
}

.sidebar-nav a.active {
    color: #ffffff;
    background-color: #2563eb;
    font-weight: 600;
}

.sidebar-footer {
    padding: 16px 20px;
    border-top: 1px solid var(--border-color);
    font-size: 0.825rem;
    color: var(--text-dim);
}

/* Layout */
.main-wrapper {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

.topbar {
    height: 64px;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--bg-main);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 32px;
}

.topbar-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.topbar-node-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
}

.topbar-node-badge .dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--success);
}

.topbar-right {
    display: flex;
    align-items: center;
    gap: 20px;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.9rem;
}

.role-badge {
    font-size: 0.75rem;
    padding: 2px 8px;
    border-radius: 12px;
    font-weight: 600;
    text-transform: uppercase;
}

.role-admin { background-color: rgba(239, 68, 68, 0.2); color: #f87171; border: 1px solid rgba(239, 68, 68, 0.4); }
.role-operator { background-color: rgba(59, 130, 246, 0.2); color: #60a5fa; border: 1px solid rgba(59, 130, 246, 0.4); }
.role-observer, .role-viewer { background-color: rgba(148, 163, 184, 0.2); color: #cbd5e1; border: 1px solid rgba(148, 163, 184, 0.4); }

.content {
    padding: 32px;
    flex-grow: 1;
    max-width: 1400px;
    width: 100%;
    margin: 0 auto;
}

/* Common Headings */
.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 28px;
}

.page-title {
    font-size: 1.6rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.page-subtitle {
    color: var(--text-muted);
    font-size: 0.925rem;
    margin-top: 4px;
}

/* Cards */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin-bottom: 28px;
}

.card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
}

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

.card-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-main);
}

.card-muted-title {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--text-dim);
    letter-spacing: 0.05em;
}

.card-value {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-main);
    margin-top: 8px;
}

.card-subtext {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 6px;
}

/* Tables */
.table-container {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow-x: auto;
    margin-bottom: 28px;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
    text-align: left;
}

th {
    background-color: rgba(15, 23, 42, 0.5);
    color: var(--text-dim);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    padding: 14px 18px;
    border-bottom: 1px solid var(--border-color);
}

td {
    padding: 14px 18px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-main);
    vertical-align: middle;
}

tr:last-child td {
    border-bottom: none;
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 8px 16px;
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: 6px;
    border: 1px solid transparent;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.15s ease-in-out;
}

.btn-primary { background-color: var(--accent); color: #0b1120; font-weight: 600; }
.btn-primary:hover { background-color: var(--accent-hover); }

.btn-secondary { background-color: transparent; border-color: var(--border-color); color: var(--text-main); }
.btn-secondary:hover { background-color: var(--bg-card-hover); }

.btn-danger { background-color: var(--danger-bg); border-color: rgba(248, 113, 113, 0.4); color: var(--danger); }
.btn-danger:hover { background-color: var(--danger); color: #ffffff; }

.btn-sm { padding: 4px 10px; font-size: 0.8rem; }

/* Forms & Inputs */
.form-group {
    margin-bottom: 18px;
}

.form-label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-muted);
    margin-bottom: 6px;
}

.form-control {
    width: 100%;
    padding: 10px 14px;
    background-color: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-main);
    font-size: 0.9rem;
    transition: border-color 0.15s ease-in-out;
}

.form-control:focus {
    outline: none;
    border-color: var(--border-focus);
}

.form-hint {
    font-size: 0.775rem;
    color: var(--text-dim);
    margin-top: 4px;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
}

/* Alerts */
.alert {
    padding: 14px 18px;
    border-radius: 6px;
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.9rem;
}

.alert-success { background-color: var(--success-bg); border: 1px solid rgba(52, 211, 153, 0.3); color: var(--success); }
.alert-danger { background-color: var(--danger-bg); border: 1px solid rgba(248, 113, 113, 0.3); color: var(--danger); }
.alert-warning { background-color: var(--warning-bg); border: 1px solid rgba(251, 191, 36, 0.3); color: var(--warning); }
.alert-info { background-color: var(--info-bg); border: 1px solid rgba(96, 165, 250, 0.3); color: var(--info); }

/* Badges */
.badge-status {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 3px 8px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
}

.badge-active { background-color: var(--success-bg); color: var(--success); border: 1px solid rgba(52, 211, 153, 0.3); }
.badge-inactive { background-color: rgba(148, 163, 184, 0.1); color: var(--text-dim); border: 1px solid var(--border-color); }
.badge-error { background-color: var(--danger-bg); color: var(--danger); border: 1px solid rgba(248, 113, 113, 0.3); }
.badge-warning { background-color: var(--warning-bg); color: var(--warning); border: 1px solid rgba(251, 191, 36, 0.3); }

/* Secret Display Box */
.secret-box {
    background-color: #0b1120;
    border: 2px dashed var(--warning);
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 24px;
}

.secret-box-title {
    color: var(--warning);
    font-weight: 700;
    font-size: 1rem;
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
}

.secret-token {
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
    font-size: 1.05rem;
    background-color: rgba(0,0,0,0.5);
    padding: 12px 16px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    color: #38bdf8;
    word-break: break-all;
    user-select: all;
    margin: 12px 0;
}

/* Progress bar */
.progress-bar-bg {
    width: 100%;
    height: 8px;
    background-color: var(--bg-main);
    border-radius: 4px;
    overflow: hidden;
    margin-top: 6px;
}

.progress-bar-fill {
    height: 100%;
    background-color: var(--accent);
    border-radius: 4px;
    transition: width 0.3s ease;
}

.progress-bar-fill.warning { background-color: var(--warning); }
.progress-bar-fill.danger { background-color: var(--danger); }

/* Login Page Specific */
.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    padding: 20px;
}

.login-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 40px;
    width: 100%;
    max-width: 420px;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.5);
}

.login-header {
    text-align: center;
    margin-bottom: 30px;
}

.login-header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.login-header p {
    color: var(--text-muted);
    font-size: 0.9rem;
}