:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --text-primary: #1e293b;
    --text-secondary: #475569;
    --background-light: #f8fafc;
    --card-background: #ffffff;
    --border-color: #e2e8f0;
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
}

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

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--background-light);
}

.hero {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    padding: var(--spacing-lg) var(--spacing-md);
    text-align: center;
}

.hero.small {
    padding: var(--spacing-md);
}

.hero h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.hero-subtitle {
    font-size: 1.125rem;
    opacity: 0.9;
    margin-bottom: var(--spacing-md);
}

/* Navigacija */
.main-nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
}

.main-nav a {
    color: white;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    transition: background-color 0.3s;
}

.main-nav a:hover,
.main-nav a.active {
    background-color: rgba(255, 255, 255, 0.1);
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-md);
}

/* Grid */
.grid-layout {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

/* Cards */
.info-card,
.hypotheses-card,
.methodology-card,
.graph-card,
.author-card {
    background: var(--card-background);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-md);
}

.stat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Hipoteze */
.hypothesis-list {
    display: grid;
    gap: var(--spacing-md);
}

.hypothesis-item {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

.hypothesis-label {
    background-color: var(--primary-color);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
}

/* Rezultati */
.results-grid {
    display: grid;
    gap: var(--spacing-lg);
}

.graph-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.graph-container {
    margin-bottom: var(--spacing-sm);
}

.graph-container img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-sm);
}

figcaption {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.conclusion-list {
    margin-top: 0.5rem;
    padding-left: var(--spacing-md);
}

.conclusion-list li {
    padding: 0.25rem;
}

/* Autor */
.author-info {
    text-align: center;
}

.author-title {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.info {
    text-align: left;
    margin-top: var(--spacing-md);
}

.info ul {
    list-style: none;
    margin-top: var(--spacing-sm);
}

.info li {
    margin-bottom: 0.5rem;
}

.page-footer {
    text-align: center;
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

@media (max-width: 768px) {
    .hero h1 {
        font-size: 1.75rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .grid-layout {
        grid-template-columns: 1fr;
    }

    .graph-grid {
        grid-template-columns: 1fr;
    }

    .hypothesis-item {
        margin-top: 1rem;
        flex-direction: column;
        text-align: center;
        gap: 0.25rem;
    }
}