:root {
    --primary: #6366f1;
    --secondary: #ec4899;
    --background: #0f172a;
    --surface: #1e293b;
    --text: #f8fafc;
    --accent: #10b981;
}

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

body {
    font-family: 'Outfit', sans-serif;
    background-color: var(--background);
    color: var(--text);
    min-height: 100vh;
    padding: 2rem;
    overflow-x: hidden;
}

.app-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

header {
    text-align: center;
}

header h1 {
    font-size: 3rem;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 700;
}

header .subtitle {
    font-size: 1.2rem;
    color: #94a3b8;
    margin-top: 0.5rem;
}

main {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 1.5rem;
}

.glass-card {
    background: rgba(30, 41, 59, 0.7);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 1.5rem;
    padding: 2rem;
    box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
}

.chart-section {
    min-height: 400px;
}

.controls-section {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.stack-info {
    display: flex;
    flex-direction: column;
    border-radius: 1rem;
    overflow: hidden;
    margin-bottom: 1rem;
}

.layer {
    padding: 0.8rem;
    text-align: center;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.9rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.ambient {
    background: rgba(255, 255, 255, 0.1);
    color: #94a3b8;
}

.film {
    background: rgba(99, 102, 241, 0.3);
    border-left: 4px solid var(--primary);
    font-weight: 600;
}

.substrate {
    background: rgba(255, 255, 255, 0.2);
    color: #cbd5e1;
}

.sliders {
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
}

.control-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
    color: #cbd5e1;
}

input[type="range"] {
    width: 100%;
    accent-color: var(--primary);
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 0.5rem;
    height: 0.5rem;
    cursor: pointer;
}

.analysis-results h3 {
    margin-bottom: 1rem;
    font-size: 1.1rem;
    color: var(--accent);
}

.answer-section {
    margin-top: 2rem;
}

.answer-section h2 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
    color: var(--accent);
}

.answer-section p,
.answer-section ul {
    line-height: 1.6;
    color: #cbd5e1;
    margin-bottom: 1rem;
}

.answer-section ul {
    margin-left: 1.5rem;
}

.answer-section strong {
    color: var(--text);
}

.full-width {
    grid-column: 1 / -1;
}

.fem-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 2rem;
    margin-top: 1.5rem;
}

.fem-chart-container {
    background: rgba(15, 23, 42, 0.4);
    border-radius: 1rem;
    padding: 1rem;
    height: 350px;
}

.fem-metrics {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    justify-content: center;
}

.metric-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 1rem;
    padding: 1.2rem;
}

.metric-card.highlight {
    background: rgba(16, 185, 129, 0.05);
    border-color: rgba(16, 185, 129, 0.2);
}

.metric-card h3 {
    font-size: 1rem;
    margin-bottom: 0.8rem;
    color: var(--text);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding-bottom: 0.5rem;
}

.metric-row {
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
    margin-bottom: 0.4rem;
}

.metric-row span {
    color: #94a3b8;
}

.arrow {
    text-align: center;
    font-size: 1.5rem;
    color: #64748b;
    font-weight: 700;
}

.success {
    color: var(--accent);
}

.danger {
    color: #f43f5e;
}

.comparison-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.comparison-grid .item {
    background: rgba(255, 255, 255, 0.02);
    padding: 1.5rem;
    border-radius: 1rem;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.comparison-grid .item h3 {
    font-size: 1.1rem;
    color: var(--primary);
    margin-bottom: 0.8rem;
}

@media (max-width: 900px) {

    main,
    .fem-grid {
        grid-template-columns: 1fr;
    }
}