:root {
    /* Color Palette */
    --color-bg: #FFFFFF;
    --color-bg-alt: #F9FAFB;
    --color-text-main: #1F2937;
    --color-text-muted: #6B7280;
    --color-primary-start: #2DD4BF;
    /* Turquoise */
    --color-primary-mid: #3B82F6;
    /* Blue */
    --color-primary-end: #8B5CF6;
    /* Purple */

    --gradient-primary: linear-gradient(135deg, var(--color-primary-start), var(--color-primary-mid), var(--color-primary-end));

    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);

    --radius-sm: 0.375rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;

    --font-inter: 'Inter', system-ui, -apple-system, sans-serif;
}

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

body {
    font-family: var(--font-inter);
    color: var(--color-text-main);
    background-color: var(--color-bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

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

/* Typography */
h1,
h2,
h3,
h4 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-text-main);
}

a {
    text-decoration: none;
    color: inherit;
    transition: opacity 0.2s;
}

a:hover {
    opacity: 0.8;
}

/* Header */
.site-header {
    padding: 1.5rem 0;
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    z-index: 100;
    border-bottom: 1px solid rgba(0, 0, 0, 0.03);
}

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

.logo-container {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 600;
    font-size: 1.25rem;
}

.logo {
    height: 40px;
    width: auto;
}

.highlight {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 800;
}

.site-nav {
    display: flex;
    gap: 2rem;
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--color-text-muted);
}

.site-nav a:hover {
    color: var(--color-text-main);
}

/* Hero */
.hero-section {
    padding: 6rem 0 6rem;
    text-align: center;
    background: radial-gradient(circle at 50% 0%, rgba(45, 212, 191, 0.05), transparent 60%);
}

.hero-title {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, #111, #444);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--color-text-muted);
    font-weight: 400;
    margin-bottom: 1rem;
}

.hero-description {
    max-width: 600px;
    margin: 0 auto 3rem;
    color: var(--color-text-muted);
    font-size: 1.125rem;
}

.btn {
    display: inline-block;
    padding: 0.875rem 2rem;
    border-radius: 2rem;
    font-weight: 600;
    transition: all 0.3s ease;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 14px 0 rgba(45, 212, 191, 0.39);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(45, 212, 191, 0.23);
    opacity: 1;
    /* Override default opacity hover */
}

/* Products */
.products-section {
    padding: 6rem 0;
    background-color: var(--color-bg-alt);
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title {
    font-size: 2.25rem;
    margin-bottom: 0.5rem;
}

.section-subtitle {
    color: var(--color-text-muted);
    font-size: 1.125rem;
}

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

.product-card {
    background: white;
    padding: 2.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    border: 1px solid rgba(0, 0, 0, 0.03);
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
    border-color: rgba(45, 212, 191, 0.2);
}

.product-icon {
    width: 64px;
    height: 64px;
    border-radius: 16px;
    background: var(--gradient-primary);
    margin-bottom: 1.5rem;
    opacity: 0.9;
    /* Placeholder for actual icons using CSS shapes or SVGs later */
    position: relative;
}

/* Simple visual differentiates for icons */
.icon-numismatics {
    background-image: url('assets/numismanagerpro-icon.jpg');
    background-size: cover;
    background-position: center;
}

.icon-stamps {
    background: linear-gradient(135deg, #3B82F6, #60A5FA);
}

.icon-wine {
    background: linear-gradient(135deg, var(--color-primary-end), #A78BFA);
}

.product-name {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
}

.product-desc {
    color: var(--color-text-muted);
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

.product-link {
    color: var(--color-primary-mid);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.25rem;
    transition: gap 0.2s;
}

.product-link:hover {
    gap: 0.5rem;
    opacity: 1;
}

/* About */
.about-section {
    padding: 6rem 0;
    text-align: center;
}

.about-content {
    max-width: 700px;
    margin: 0 auto;
}

.about-content p {
    font-size: 1.25rem;
    color: var(--color-text-muted);
    margin-bottom: 1.5rem;
}

/* Contact */
.contact-section {
    padding: 4rem 0 6rem;
}

.contact-card {
    background: linear-gradient(135deg, #f0fdfa, #f5f3ff);
    padding: 4rem 2rem;
    border-radius: 2rem;
    text-align: center;
    border: 1px solid white;
    box-shadow: var(--shadow-md);
}

.contact-card h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.email-link {
    display: inline-block;
    font-size: 1.5rem;
    margin-top: 1rem;
    font-weight: 600;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    padding-bottom: 2px;
    border-bottom: 2px solid transparent;
    /* Placeholder for hover effect? */
}

/* Footer */
.site-footer {
    padding: 2rem 0;
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.875rem;
    border-top: 1px solid rgba(0, 0, 0, 0.05);
}

/* Media Queries */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }

    .site-nav {
        display: none;
        /* Mobile menu to be added if needed, simplicity for now */
    }
}