/* ── Reset & Variables ─────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    /* Dark theme (default) */
    --bg-base:       #0d1117;
    --bg-surface:    #161b22;
    --bg-elevated:   #21262d;
    --bg-hover:      #30363d;
    --border:        #30363d;
    --border-subtle: #21262d;

    --text-primary:   #e6edf3;
    --text-secondary: #8b949e;
    --text-muted:     #484f58;

    --accent:         #388bfd;
    --accent-bg:      rgba(56, 139, 253, 0.1);
    --accent-border:  rgba(56, 139, 253, 0.4);

    --success:        #3fb950;
    --success-bg:     rgba(63, 185, 80, 0.1);
    --warning:        #d29922;
    --warning-bg:     rgba(210, 153, 34, 0.1);
    --danger:         #f85149;
    --danger-bg:      rgba(248, 81, 73, 0.1);

    --sidebar-width:  240px;
    --topbar-height:  56px;
    --radius-sm:      6px;
    --radius-md:      8px;
    --radius-lg:      12px;

    --font-sans:  'Inter', system-ui, -apple-system, sans-serif;
    --font-mono:  'JetBrains Mono', 'Consolas', monospace;

    --transition: 200ms cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="light"] {
    --bg-base:       #f6f8fa;
    --bg-surface:    #ffffff;
    --bg-elevated:   #f6f8fa;
    --bg-hover:      #eaeef2;
    --border:        #d0d7de;
    --border-subtle: #eaeef2;

    --text-primary:   #1f2328;
    --text-secondary: #636c76;
    --text-muted:     #9198a1;

    --accent:         #0969da;
    --accent-bg:      rgba(9, 105, 218, 0.08);
    --accent-border:  rgba(9, 105, 218, 0.3);
}

/* ── Base ──────────────────────────────────────────────────────────── */
html { font-size: 14px; scroll-behavior: smooth; }

body {
    font-family: var(--font-sans);
    background: var(--bg-base);
    color: var(--text-primary);
    line-height: 1.6;
    display: flex;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Sidebar ───────────────────────────────────────────────────────── */
.sidebar {
    width: var(--sidebar-width);
    min-height: 100vh;
    background: var(--bg-surface);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    position: fixed;
    left: 0;
    top: 0;
    z-index: 100;
    transition: width var(--transition), transform var(--transition);
    overflow: hidden;
}

.sidebar.collapsed { width: 60px; }

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 14px;
    height: var(--topbar-height);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    overflow: hidden;
}

.brand-icon {
    width: 30px;
    height: 30px;
    background: var(--accent);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    color: #fff;
    flex-shrink: 0;
}

.brand-name {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
    transition: opacity var(--transition);
}

.sidebar.collapsed .brand-name,
.sidebar.collapsed .nav-section-label,
.sidebar.collapsed .nav-item span:not(.nav-status),
.sidebar.collapsed .user-name { opacity: 0; width: 0; overflow: hidden; }

.sidebar-toggle {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 6px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    transition: background var(--transition), color var(--transition);
    flex-shrink: 0;
}
.sidebar-toggle:hover { background: var(--bg-hover); color: var(--text-primary); }

/* ── Nav ───────────────────────────────────────────────────────────── */
.sidebar-nav {
    flex: 1;
    padding: 12px 8px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 4px;
    scrollbar-width: thin;
    scrollbar-color: var(--border) transparent;
}

.nav-section { display: flex; flex-direction: column; gap: 2px; }

.nav-section-label {
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-muted);
    padding: 8px 10px 4px;
    white-space: nowrap;
    transition: opacity var(--transition);
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 10px;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 450;
    cursor: pointer;
    transition: background var(--transition), color var(--transition);
    white-space: nowrap;
    position: relative;
}

.nav-item:hover { background: var(--bg-hover); color: var(--text-primary); text-decoration: none; }
.nav-item.active { background: var(--accent-bg); color: var(--accent); border: 1px solid var(--accent-border); }
.nav-item.active i { color: var(--accent); }

.nav-item i { font-size: 17px; flex-shrink: 0; width: 20px; text-align: center; }

.nav-status {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    margin-left: auto;
    flex-shrink: 0;
}
.status-running     { background: var(--success); }
.status-maintenance { background: var(--warning); }
.status-faulted     { background: var(--danger); animation: pulse-danger 2s infinite; }
.status-loading     { background: var(--text-muted); }

@keyframes pulse-danger {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

.nav-bottom { margin-top: auto; padding-top: 12px; border-top: 1px solid var(--border); }

/* ── Main wrapper ──────────────────────────────────────────────────── */
.main-wrapper {
    margin-left: var(--sidebar-width);
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    transition: margin-left var(--transition);
}

body.sidebar-collapsed .main-wrapper { margin-left: 60px; }

/* ── Topbar ────────────────────────────────────────────────────────── */
.topbar {
    height: var(--topbar-height);
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    position: sticky;
    top: 0;
    z-index: 50;
}

.topbar-left, .topbar-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.breadcrumb-nav {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--text-secondary);
}

.topbar-divider {
    width: 1px;
    height: 20px;
    background: var(--border);
}

.icon-btn {
    background: none;
    border: 1px solid var(--border);
    color: var(--text-secondary);
    cursor: pointer;
    padding: 6px 8px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    font-size: 16px;
    transition: background var(--transition), color var(--transition);
}
.icon-btn:hover { background: var(--bg-hover); color: var(--text-primary); }

.user-menu {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    transition: background var(--transition);
}
.user-menu:hover { background: var(--bg-hover); }

.avatar {
    width: 28px;
    height: 28px;
    background: var(--accent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 600;
    color: #fff;
}

.user-name { font-size: 13px; font-weight: 500; }

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 20px;
    padding: 4px;
}

/* ── Page content ──────────────────────────────────────────────────── */
.page-content {
    flex: 1;
    padding: 24px;
    max-width: 1400px;
}

.page-header {
    margin-bottom: 24px;
}

.page-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.page-subtitle {
    font-size: 13px;
    color: var(--text-secondary);
}

/* ── Cards ─────────────────────────────────────────────────────────── */
.card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 20px;
}

.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-primary);
}

/* ── Stat cards ────────────────────────────────────────────────────── */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 16px 20px;
    display: flex;
    align-items: flex-start;
    gap: 14px;
}

.stat-icon {
    width: 38px;
    height: 38px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    flex-shrink: 0;
}

.stat-icon.accent  { background: var(--accent-bg);  color: var(--accent); }
.stat-icon.success { background: var(--success-bg); color: var(--success); }
.stat-icon.warning { background: var(--warning-bg); color: var(--warning); }
.stat-icon.danger  { background: var(--danger-bg);  color: var(--danger); }

.stat-body { flex: 1; }
.stat-label { font-size: 11px; color: var(--text-muted); font-weight: 500; text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 4px; }
.stat-value { font-size: 22px; font-weight: 600; color: var(--text-primary); line-height: 1; }

/* ── Module status table ───────────────────────────────────────────── */
.module-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}

.module-table th {
    text-align: left;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
    padding: 8px 12px;
    border-bottom: 1px solid var(--border);
}

.module-table td {
    padding: 12px;
    border-bottom: 1px solid var(--border-subtle);
    color: var(--text-secondary);
    vertical-align: middle;
}

.module-table tr:last-child td { border-bottom: none; }
.module-table tr:hover td { background: var(--bg-hover); }

/* ── Badges ────────────────────────────────────────────────────────── */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 2px 8px;
    border-radius: 100px;
    font-size: 11px;
    font-weight: 500;
}

.badge::before {
    content: '';
    display: inline-block;
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: currentColor;
}

.badge-running     { background: var(--success-bg); color: var(--success); }
.badge-maintenance { background: var(--warning-bg); color: var(--warning); }
.badge-faulted     { background: var(--danger-bg);  color: var(--danger); }
.badge-loading     { background: var(--bg-elevated); color: var(--text-muted); }

/* ── Buttons ───────────────────────────────────────────────────────── */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    border: 1px solid transparent;
    transition: background var(--transition), border-color var(--transition), color var(--transition);
    font-family: var(--font-sans);
}

.btn-primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn-primary:hover { background: #1f6feb; }

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

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

.btn-warning { background: var(--warning-bg); color: var(--warning); border-color: var(--warning); }
.btn-warning:hover { background: var(--warning); color: #fff; }

.btn-sm { padding: 4px 10px; font-size: 12px; }

/* ── Grid helpers ──────────────────────────────────────────────────── */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }

/* ── Alert / Notice ────────────────────────────────────────────────── */
.alert {
    padding: 12px 16px;
    border-radius: var(--radius-md);
    border: 1px solid;
    font-size: 13px;
    display: flex;
    align-items: flex-start;
    gap: 10px;
    margin-bottom: 16px;
}
.alert-warning { background: var(--warning-bg); border-color: var(--warning); color: var(--warning); }
.alert-danger  { background: var(--danger-bg);  border-color: var(--danger);  color: var(--danger); }
.alert-success { background: var(--success-bg); border-color: var(--success); color: var(--success); }
.alert i { font-size: 16px; margin-top: 1px; flex-shrink: 0; }
.alert-body { color: var(--text-primary); }
.alert-body strong { font-weight: 600; }

/* ── Footer ────────────────────────────────────────────────────────── */
.page-footer {
    padding: 12px 24px;
    border-top: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    color: var(--text-muted);
}

/* ── Overlay for mobile ────────────────────────────────────────────── */
.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 99;
}

/* ── Responsive ────────────────────────────────────────────────────── */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        width: var(--sidebar-width) !important;
    }

    .sidebar.mobile-open { transform: translateX(0); }

    .sidebar-overlay.active { display: block; }

    .main-wrapper { margin-left: 0 !important; }

    .mobile-menu-btn { display: flex; }
    .sidebar-toggle  { display: none; }
    .brand-name, .nav-section-label, .nav-item span:not(.nav-status) { opacity: 1 !important; width: auto !important; }

    .grid-2, .grid-3 { grid-template-columns: 1fr; }

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

    .page-content { padding: 16px; }
}