:root {
    --bg: #f5f7fa; --surface: #fff; --text: #1a1a2e; --text-muted: #6b7280;
    --border: #e5e7eb; --primary: #2563eb; --primary-hover: #1d4ed8;
    --success: #10b981; --danger: #ef4444; --warning: #f59e0b;
    --info: #3b82f6; --muted: #9ca3af;
    --nav-bg: #1e293b; --nav-text: #e2e8f0;
    --code-bg: #f1f5f9; --shadow: 0 1px 3px rgba(0,0,0,.1);
}
body.dark {
    --bg: #0f172a; --surface: #1e293b; --text: #e2e8f0; --text-muted: #94a3b8;
    --border: #334155; --code-bg: #0f172a; --nav-bg: #020617;
    --shadow: 0 1px 3px rgba(0,0,0,.3);
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif; background: var(--bg); color: var(--text); line-height: 1.6; }

/* Navbar */
.navbar { background: var(--nav-bg); color: var(--nav-text); display: flex; align-items: center; padding: 0 1.5rem; height: 56px; gap: 1.5rem; }
.navbar-brand { display: flex; align-items: center; gap: .5rem; }
.logo { font-weight: 700; font-size: 1.1rem; }
.navbar-menu { list-style: none; display: flex; gap: .25rem; }
.navbar-menu a { color: var(--nav-text); text-decoration: none; padding: .5rem .75rem; border-radius: 6px; font-size: .875rem; transition: background .15s; }
.navbar-menu a:hover, .navbar-menu a.active { background: rgba(255,255,255,.1); }
.navbar-right { margin-left: auto; display: flex; align-items: center; gap: .75rem; }
.navbar-username { font-size: .875rem; opacity: .8; }
.navbar-logout { background: none; border: 1px solid rgba(255,255,255,.2); color: var(--nav-text); padding: .25rem .75rem; border-radius: 4px; cursor: pointer; font-size: .8rem; }
.navbar-toggle { display: none; background: none; border: none; cursor: pointer; }
.navbar-toggle span { display: block; width: 22px; height: 2px; background: var(--nav-text); margin: 5px 0; }
.theme-toggle { background: none; border: none; color: var(--nav-text); font-size: 1.2rem; cursor: pointer; }

/* Container */
.container { max-width: 1100px; margin: 0 auto; padding: 1.5rem; }

/* Stats */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1rem; margin-bottom: 1.5rem; }
.stat-card { background: var(--surface); border: 1px solid var(--border); border-radius: 8px; padding: 1.25rem; box-shadow: var(--shadow); }
.stat-label { font-size: .8rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: .05em; }
.stat-value { font-size: 1.5rem; font-weight: 700; margin: .25rem 0; }
.stat-detail { font-size: .8rem; color: var(--text-muted); }

/* Status dots */
.status-dot { display: inline-block; width: 10px; height: 10px; border-radius: 50%; margin-right: 4px; }
.status-on { background: var(--success); }
.status-off { background: var(--danger); }
.status-warn { background: var(--warning); }

/* Sections */
.section { background: var(--surface); border: 1px solid var(--border); border-radius: 8px; padding: 1.25rem; margin-bottom: 1.5rem; box-shadow: var(--shadow); }
.section-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1rem; }
.section h2 { font-size: 1.1rem; margin-bottom: .75rem; }

/* Tables */
.table { width: 100%; border-collapse: collapse; font-size: .875rem; }
.table th { text-align: left; padding: .6rem .75rem; border-bottom: 2px solid var(--border); color: var(--text-muted); font-weight: 600; font-size: .75rem; text-transform: uppercase; }
.table td { padding: .6rem .75rem; border-bottom: 1px solid var(--border); vertical-align: middle; }
.table tbody tr:hover { background: rgba(37,99,235,.04); }
.row-disabled { opacity: .5; }
.table-sm td, .table-sm th { padding: .35rem .5rem; font-size: .8rem; }
.actions { white-space: nowrap; }

/* Badges */
.badge { display: inline-block; padding: .15rem .5rem; border-radius: 4px; font-size: .75rem; font-weight: 600; background: var(--border); }
.badge-tcp { background: #dbeafe; color: #1e40af; }
.badge-udp { background: #fef3c7; color: #92400e; }
body.dark .badge-tcp { background: #1e3a5f; color: #93c5fd; }
body.dark .badge-udp { background: #451a03; color: #fcd34d; }

/* Buttons */
.btn { display: inline-block; padding: .5rem 1rem; border: none; border-radius: 6px; font-size: .875rem; font-weight: 500; cursor: pointer; text-decoration: none; transition: all .15s; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-secondary { background: var(--border); color: var(--text); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-success { background: var(--success); color: #fff; }
.btn-muted { background: var(--border); color: var(--text-muted); }
.btn-sm { padding: .25rem .5rem; font-size: .75rem; }
.btn-block { display: block; width: 100%; text-align: center; }
.btn-icon { background: none; border: none; color: var(--danger); cursor: pointer; font-weight: bold; padding: 0 .25rem; }

/* Forms */
.form-card { background: var(--surface); border: 1px solid var(--border); border-radius: 8px; padding: 1.5rem; box-shadow: var(--shadow); max-width: 700px; }
.form-group { margin-bottom: 1rem; }
.form-group label { display: block; font-size: .875rem; font-weight: 500; margin-bottom: .25rem; }
.form-group small { color: var(--text-muted); }
.form-group input, .form-group select, .form-group textarea { width: 100%; padding: .5rem .75rem; border: 1px solid var(--border); border-radius: 6px; font-size: .875rem; background: var(--bg); color: var(--text); }
.form-group input:focus, .form-group select:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37,99,235,.15); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.form-actions { display: flex; gap: .75rem; margin-top: 1.5rem; }
.form-inline { display: flex; gap: .5rem; align-items: center; margin-top: .75rem; }
.form-inline input { flex: 1; }
.form-meta { margin-top: 1rem; color: var(--text-muted); }

/* Radio */
.radio-group { display: flex; gap: 1rem; }
.radio-label { display: flex; align-items: center; gap: .35rem; cursor: pointer; font-size: .875rem; }

/* Alerts */
.alert { padding: .75rem 1rem; border-radius: 6px; margin-bottom: 1rem; font-size: .875rem; }
.alert-error { background: #fef2f2; color: #991b1b; border: 1px solid #fecaca; }
.alert-success { background: #f0fdf4; color: #166534; border: 1px solid #bbf7d0; }
.alert-warning { background: #fffbeb; color: #92400e; border: 1px solid #fde68a; }
.alert-info { background: #eff6ff; color: #1e40af; border: 1px solid #bfdbfe; }
body.dark .alert-error { background: #450a0a; color: #fca5a5; border-color: #7f1d1d; }
body.dark .alert-success { background: #052e16; color: #86efac; border-color: #14532d; }
body.dark .alert-info { background: #172554; color: #93c5fd; border-color: #1e3a5f; }

/* Code */
code { background: var(--code-bg); padding: .1rem .35rem; border-radius: 3px; font-size: .85em; }
.code-block { background: var(--code-bg); border: 1px solid var(--border); border-radius: 6px; padding: 1rem; overflow-x: auto; font-size: .8rem; white-space: pre; font-family: 'SF Mono', Monaco, monospace; }

/* IP pool */
.ip-pool { display: flex; flex-wrap: wrap; gap: .5rem; margin-bottom: .75rem; }
.ip-tag { display: flex; align-items: center; gap: .35rem; background: var(--code-bg); border: 1px solid var(--border); border-radius: 6px; padding: .3rem .6rem; }

/* Empty state */
.empty-state { text-align: center; padding: 3rem 1rem; color: var(--text-muted); }

/* Login */
.login-page { display: flex; align-items: center; justify-content: center; min-height: 100vh; }
.login-container { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 2.5rem; width: 100%; max-width: 400px; box-shadow: var(--shadow); text-align: center; }
.login-container h1 { font-size: 1.5rem; margin-bottom: .25rem; }
.login-subtitle { color: var(--text-muted); margin-bottom: 1.5rem; font-size: .9rem; }
.sso-btn { margin-bottom: 1rem; padding: .75rem; font-size: 1rem; }
.divider { display: flex; align-items: center; gap: 1rem; margin: 1.25rem 0; color: var(--text-muted); font-size: .8rem; }
.divider::before, .divider::after { content: ''; flex: 1; height: 1px; background: var(--border); }

/* Toast */
.toast-container { position: fixed; top: 1rem; right: 1rem; z-index: 9999; display: flex; flex-direction: column; gap: .5rem; }
.toast { padding: .75rem 1.25rem; border-radius: 8px; font-size: .875rem; opacity: 0; transform: translateX(100%); transition: all .3s; }
.toast.show { opacity: 1; transform: translateX(0); }
.toast-success { background: #10b981; color: #fff; }
.toast-error { background: #ef4444; color: #fff; }
.toast-warning { background: #f59e0b; color: #fff; }
.toast-info { background: #3b82f6; color: #fff; }

/* Footer */
.footer { text-align: center; padding: 1.5rem; color: var(--text-muted); font-size: .8rem; }

/* Responsive */
@media (max-width: 768px) {
    .navbar-toggle { display: block; }
    .navbar-menu, .navbar-right { display: none; flex-direction: column; position: absolute; top: 56px; left: 0; right: 0; background: var(--nav-bg); padding: .5rem; z-index: 100; }
    .navbar-menu.open, .navbar-right.open { display: flex; }
    .form-row { grid-template-columns: 1fr; }
    .radio-group { flex-direction: column; }
}