/* AI-BOK Website - Navy/Gold theme matching the book design */
:root {
    --navy: #0C1D4F;
    --navy-light: #1A365D;
    --gold: #E2A93B;
    --gold-light: #F5C320;
    --gold-dark: #C4891E;
    --green: #276749;
    --gray: #4A5568;
    --gray-light: #718096;
    --gray-bg: #F7FAFC;
    --white: #FFFFFF;
    --red: #C53030;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    font-size: 16px;
    line-height: 1.65;
    color: #2D3748;
    background: var(--white);
}

.container { max-width: 1100px; margin: 0 auto; padding: 0 24px; }
.container-sm { max-width: 680px; }

/* Navigation */
.nav {
    background: var(--navy);
    padding: 16px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}
.nav-inner { display: flex; justify-content: space-between; align-items: center; }
.nav-brand {
    color: var(--white);
    text-decoration: none;
    font-size: 20px;
    font-weight: 700;
    letter-spacing: -0.5px;
}
.nav-logo {
    background: var(--gold);
    color: var(--navy);
    padding: 2px 8px;
    border-radius: 4px;
    font-weight: 800;
    margin-right: 2px;
}
.nav-links { display: flex; gap: 24px; }
.nav-links a { color: rgba(255,255,255,0.8); text-decoration: none; font-size: 14px; font-weight: 500; }
.nav-links a:hover { color: var(--gold); }
.lang-switch {
    background: rgba(255,255,255,0.15) !important;
    padding: 4px 12px !important;
    border-radius: 4px;
    font-size: 13px !important;
}
.lang-switch:hover { background: var(--gold) !important; color: var(--navy) !important; }

/* Hero */
.hero {
    background: linear-gradient(135deg, var(--navy) 0%, var(--navy-light) 100%);
    color: var(--white);
    padding: 80px 0 100px;
    text-align: center;
}
.hero-badge {
    display: inline-block;
    background: var(--gold);
    color: var(--navy);
    font-size: 13px;
    font-weight: 700;
    padding: 4px 16px;
    border-radius: 20px;
    margin-bottom: 24px;
    text-transform: uppercase;
    letter-spacing: 1px;
}
.hero h1 {
    font-size: 48px;
    font-weight: 800;
    letter-spacing: -1px;
    margin-bottom: 16px;
}
.hero-subtitle {
    font-size: 20px;
    color: var(--gold);
    font-weight: 500;
    margin-bottom: 16px;
}
.hero-desc {
    font-size: 15px;
    color: rgba(255,255,255,0.7);
    margin-bottom: 32px;
    line-height: 1.8;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 32px;
    border-radius: 6px;
    font-weight: 600;
    font-size: 15px;
    text-decoration: none;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
}
.btn-gold {
    background: var(--gold);
    color: var(--navy);
}
.btn-gold:hover { background: var(--gold-light); transform: translateY(-1px); box-shadow: 0 4px 12px rgba(226,169,59,0.4); }
.btn-outline {
    background: transparent;
    color: var(--navy);
    border: 2px solid var(--navy);
}
.btn-outline:hover { background: var(--navy); color: var(--white); }
.btn-lg { padding: 16px 40px; font-size: 17px; }
.btn-block { display: block; width: 100%; text-align: center; }

/* Features */
.features { padding: 80px 0; background: var(--gray-bg); }
.features-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.feature-card {
    background: var(--white);
    padding: 32px 24px;
    border-radius: 8px;
    text-align: center;
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}
.feature-icon {
    font-size: 36px;
    font-weight: 800;
    color: var(--gold);
    margin-bottom: 12px;
}
.feature-card h3 { color: var(--navy); font-size: 16px; margin-bottom: 8px; }
.feature-card p { color: var(--gray-light); font-size: 14px; }

/* Products */
.products { padding: 80px 0; }
.section-title { text-align: center; color: var(--navy); font-size: 32px; margin-bottom: 8px; }
.section-subtitle { text-align: center; color: var(--gray-light); margin-bottom: 48px; }
.product-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 32px; }
.product-card {
    border: 1px solid #E2E8F0;
    border-radius: 12px;
    overflow: hidden;
    transition: box-shadow 0.2s;
}
.product-card:hover { box-shadow: 0 8px 24px rgba(0,0,0,0.1); }
.product-cover {
    height: 260px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}
.product-cover-nl { background: linear-gradient(135deg, var(--navy) 0%, var(--navy-light) 100%); }
.product-cover-en { background: linear-gradient(135deg, var(--navy-light) 0%, #2C5282 100%); }
.product-cover-inner { text-align: center; color: var(--white); }
.product-cover-inner h3 { font-size: 24px; margin: 8px 0; }
.product-lang {
    background: var(--gold);
    color: var(--navy);
    padding: 3px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
}
.product-pages { font-size: 14px; color: rgba(255,255,255,0.7); }
.product-info { padding: 24px; }
.product-info h3 { color: var(--navy); margin-bottom: 8px; }
.product-info p { color: var(--gray); font-size: 14px; margin-bottom: 16px; }
.product-price { margin-bottom: 16px; }
.price-amount { font-size: 28px; font-weight: 800; color: var(--navy); }
.price-vat { font-size: 13px; color: var(--gray-light); margin-left: 8px; }

/* About */
.about { padding: 80px 0; background: var(--gray-bg); }
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; margin-top: 32px; }
.about p { margin-bottom: 16px; color: var(--gray); }
.about-highlights { display: flex; flex-direction: column; gap: 16px; }
.highlight {
    background: var(--white);
    padding: 16px 20px;
    border-radius: 8px;
    border-left: 4px solid var(--gold);
}
.highlight strong { display: block; color: var(--navy); margin-bottom: 4px; }
.highlight span { font-size: 14px; color: var(--gray); }

/* Author */
.author { padding: 80px 0; }
.author-card {
    max-width: 600px;
    margin: 32px auto 0;
    text-align: center;
}
.author-info h3 { color: var(--navy); font-size: 24px; }
.author-role { color: var(--gold); font-weight: 600; margin-bottom: 16px; }
.author-info p { color: var(--gray); }

/* Checkout */
.checkout { padding: 60px 0; }
.checkout h1 { color: var(--navy); margin-bottom: 24px; }
.checkout-product {
    background: var(--gray-bg);
    padding: 24px;
    border-radius: 8px;
    margin-bottom: 32px;
}
.checkout-product h3 { color: var(--navy); }
.checkout-form { margin-top: 24px; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-weight: 600; color: var(--navy); margin-bottom: 6px; font-size: 14px; }
.form-group input[type="email"],
.form-group input[type="text"] {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid #E2E8F0;
    border-radius: 6px;
    font-size: 15px;
    font-family: inherit;
}
.form-group input:focus { outline: none; border-color: var(--gold); box-shadow: 0 0 0 3px rgba(226,169,59,0.2); }
.form-group small { display: block; color: var(--gray-light); font-size: 12px; margin-top: 4px; }
.form-check label { font-weight: 400; font-size: 14px; color: var(--gray); cursor: pointer; }
.form-check input { margin-right: 8px; }
.checkout-methods { text-align: center; color: var(--gray-light); font-size: 13px; margin-top: 12px; }

/* Result pages */
.result { padding: 80px 0; }
.result-card {
    text-align: center;
    padding: 48px 32px;
    border-radius: 12px;
    border: 1px solid #E2E8F0;
}
.result-success { border-color: var(--green); background: #F0FFF4; }
.result-failed { border-color: var(--red); background: #FFF5F5; }
.result-icon { font-size: 48px; margin-bottom: 16px; }
.result-card h1 { color: var(--navy); margin-bottom: 16px; }
.result-card p { color: var(--gray); margin-bottom: 16px; }
.download-section {
    background: var(--white);
    padding: 24px;
    border-radius: 8px;
    margin: 24px 0;
}
.download-section h3 { color: var(--navy); margin-bottom: 16px; }
.download-section .btn { margin-bottom: 12px; }
.result-note {
    background: var(--gray-bg);
    padding: 16px;
    border-radius: 8px;
    font-size: 14px;
    text-align: left;
}

/* Legal pages */
.legal { padding: 60px 0; }
.legal h1 { color: var(--navy); margin-bottom: 24px; }
.legal h2 { color: var(--navy-light); font-size: 18px; margin: 24px 0 8px; }
.legal p, .legal li { color: var(--gray); margin-bottom: 8px; }
.legal ul { padding-left: 20px; }
.legal a { color: var(--gold-dark); }

/* Footer */
.footer {
    background: var(--navy);
    color: rgba(255,255,255,0.7);
    padding: 48px 0 24px;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 32px; margin-bottom: 32px; }
.footer h4 { color: var(--white); margin-bottom: 12px; font-size: 14px; text-transform: uppercase; letter-spacing: 1px; }
.footer a { display: block; color: rgba(255,255,255,0.6); text-decoration: none; font-size: 14px; margin-bottom: 8px; }
.footer a:hover { color: var(--gold); }
.footer-text { font-size: 14px; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding-top: 24px; text-align: center; font-size: 13px; }

/* Responsive */
@media (max-width: 768px) {
    .hero h1 { font-size: 32px; }
    .hero { padding: 48px 0 64px; }
    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .product-grid { grid-template-columns: 1fr; }
    .about-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
    .nav-links { display: none; }
}
@media (max-width: 480px) {
    .features-grid { grid-template-columns: 1fr; }
    .hero h1 { font-size: 28px; }
}