:root {
    --bg: #0f172a;
    --sidebar: #1e293b;
    --card: #1e293b;
    --border: #334155;
    --text: #f1f5f9;
    --muted: #94a3b8;
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --danger: #ef4444;
    --success: #10b981;
    --radius: 12px;
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: 'Inter', system-ui, sans-serif;
    margin: 0;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

a { text-decoration: none; color: inherit; transition: 0.2s; }
* { box-sizing: border-box; }

/* Layout */
.app-layout {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 260px;
    background: var(--sidebar);
    border-right: 1px solid var(--border);
    padding: 24px;
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
}

.main-content {
    flex: 1;
    margin-left: 260px;
    padding: 40px;
    background: var(--bg);
}

.brand {
    font-size: 20px;
    font-weight: 800;
    margin-bottom: 40px;
    color: var(--text);
    letter-spacing: -0.5px;
    display: flex;
    align-items: center;
    gap: 10px;
}
.brand span { 
    background: linear-gradient(135deg, var(--primary) 0%, var(--vergen) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Navigation */
.nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    border-radius: 8px;
    color: var(--muted);
    font-weight: 500;
    margin-bottom: 4px;
}
.nav-link:hover, .nav-link.active {
    background: rgba(59, 130, 246, 0.1);
    color: var(--primary);
}
.nav-section {
    font-size: 11px;
    text-transform: uppercase;
    color: var(--muted);
    font-weight: 700;
    margin: 24px 0 10px 12px;
    letter-spacing: 0.05em;
}

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

.dashboard-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    transition: 0.2s;
    display: flex;
    align-items: center;
    gap: 16px;
}
.dashboard-card:hover {
    transform: translateY(-2px);
    border-color: var(--primary);
}
.card-icon {
    width: 48px;
    height: 48px;
    background: rgba(59, 130, 246, 0.1);
    color: var(--primary);
    border-radius: 12px;
    display: grid;
    place-items: center;
    font-size: 20px;
}

/* Forms & Tables */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 32px;
}
h1 { margin: 0; font-size: 24px; font-weight: 700; }

.panel {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}

.form-group { margin-bottom: 20px; }
label { display: block; margin-bottom: 8px; font-size: 13px; font-weight: 600; color: var(--muted); }
input, textarea, select {
    width: 100%;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px;
    color: var(--text);
    font-family: inherit;
    transition: 0.2s;
}
input:focus, textarea:focus {
    border-color: var(--primary);
    outline: none;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.btn {
    background: var(--primary);
    color: white;
    padding: 12px 24px;
    border-radius: 8px;
    border: none;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}
.btn:hover { background: var(--primary-hover); }
.btn-outline {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--muted);
}
.btn-outline:hover {
    border-color: var(--text);
    color: var(--text);
}
.btn-danger { color: var(--danger); background: rgba(239, 68, 68, 0.1); }
.btn-danger:hover { background: rgba(239, 68, 68, 0.2); }

/* List Items */
.list-item {
    display: flex;
    align-items: center;
    padding: 16px 24px;
    border-bottom: 1px solid var(--border);
    gap: 20px;
}
.list-item:last-child { border-bottom: none; }
.item-image {
    width: 48px;
    height: 48px;
    border-radius: 8px;
    object-fit: cover;
    background: var(--bg);
}
.item-content { flex: 1; }
.item-title { font-weight: 600; margin-bottom: 4px; display: block; }
.item-meta { font-size: 13px; color: var(--muted); }

/* Login */
.login-page {
    display: grid;
    place-items: center;
    height: 100vh;
    background: var(--bg);
}
.login-card {
    background: var(--card);
    padding: 40px;
    border-radius: 24px;
    border: 1px solid var(--border);
    width: 100%;
    max-width: 400px;
}

/* Details/Summary Customization */
details > summary { list-style: none; }
details > summary::-webkit-details-marker { display: none; }