:root {
    --primary: #0284c7;
    --primary-hover: #0ea5e9;
    --bg-main: #0f172a;
    --bg-card: #1e293b;
    --border: #334155;
    --text-main: #f1f5f9;
    --text-muted: #94a3b8;
}

body {
    background-color: var(--bg-main);
    color: var(--text-main);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    margin: 0;
    line-height: 1.5;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

.card {
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 1rem;
    padding: 2rem;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    height: 100%;
}

.grid {
    display: grid;
    gap: 2rem;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.header {
    border-bottom: 1px solid var(--border);
    padding: 1.5rem 0;
    margin-bottom: 3rem;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
}

h1, h2, h3 {
    margin-top: 0;
    color: #fff;
}

.text-sky { color: var(--primary); }
.text-muted { color: var(--text-muted); }

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.2s;
    cursor: pointer;
}

.btn-primary {
    background-color: var(--primary);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
}

.calculator {
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    border: 1px solid var(--primary);
}

.kpi-value {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary);
    margin: 1rem 0;
}

.chart-container {
    position: relative;
    height: 300px;
    width: 100%;
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logout-link {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.875rem;
}

.logout-link:hover {
    color: var(--text-main);
}