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

:root {
    --bg: #0f1117;
    --bg-card: #1a1d27;
    --bg-input: #252836;
    --border: #2d3140;
    --text: #e4e6ef;
    --text-muted: #8b8fa3;
    --primary: #4f6ef7;
    --primary-hover: #3d5bd9;
    --success: #22c55e;
    --success-bg: rgba(34, 197, 94, 0.15);
    --warning: #f59e0b;
    --warning-bg: rgba(245, 158, 11, 0.15);
    --danger: #ef4444;
    --danger-bg: rgba(239, 68, 68, 0.15);
    --info: #3b82f6;
    --info-bg: rgba(59, 130, 246, 0.15);
    --sidebar-width: 240px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
}

#app {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-card);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 100;
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid var(--border);
}

.sidebar-header h1 {
    font-size: 18px;
    font-weight: 700;
    color: var(--primary);
}

.user-info {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 8px;
}

.sidebar-nav {
    flex: 1;
    padding: 12px 0;
    overflow-y: auto;
}

.sidebar-nav a {
    display: block;
    padding: 10px 20px;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 14px;
    transition: all 0.15s;
}

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

.sidebar-nav a.active {
    color: var(--primary);
    background: rgba(79, 110, 247, 0.1);
    border-left: 3px solid var(--primary);
}

.sidebar-footer {
    padding: 16px 20px;
    border-top: 1px solid var(--border);
}

.content {
    flex: 1;
    margin-left: var(--sidebar-width);
    padding: 24px 32px;
    max-width: 1200px;
}

.content h2 {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 20px;
}

/* Login overlay */
.login-overlay {
    position: fixed;
    inset: 0;
    background: var(--bg);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.login-overlay.hidden {
    display: none;
}

.login-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 40px;
    width: 360px;
}

.login-card h2 {
    text-align: center;
    margin-bottom: 24px;
    font-size: 20px;
    color: var(--primary);
}

/* Toast */
.toast {
    position: fixed;
    bottom: 24px;
    right: 24px;
    padding: 12px 20px;
    border-radius: 8px;
    font-size: 14px;
    z-index: 2000;
    transition: opacity 0.3s;
}

.toast.hidden {
    opacity: 0;
    pointer-events: none;
}

.toast.success {
    background: var(--success-bg);
    color: var(--success);
    border: 1px solid var(--success);
}

.toast.error {
    background: var(--danger-bg);
    color: var(--danger);
    border: 1px solid var(--danger);
}