/* UK Chart History Website Styles */

:root {
    --primary-color: #7C3AED;
    --primary-dark: #5B21B6;
    --primary-light: #A78BFA;
    --accent-color: #F59E0B;
    --text-primary: #1F2937;
    --text-secondary: #6B7280;
    --text-light: #9CA3AF;
    --bg-primary: #FFFFFF;
    --bg-secondary: #F9FAFB;
    --bg-dark: #111827;
    --border-color: #E5E7EB;
    --success-color: #10B981;
    --error-color: #EF4444;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    line-height: 1.6;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    padding: 0 24px;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 700;
    font-size: 1.25rem;
}

.nav-logo img {
    width: 40px;
    height: 40px;
    border-radius: 10px;
}

.nav-links {
    display: flex;
    gap: 32px;
    list-style: none;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    transition: color 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--primary-color);
}

.nav-cta {
    background: var(--primary-color);
    color: white;
    padding: 10px 20px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: background 0.2s;
}

.nav-cta:hover {
    background: var(--primary-dark);
}

/* Mobile menu */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-primary);
}

/* Hero Section */
.hero {
    padding: 140px 24px 80px;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-content h1 {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 24px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-content p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 32px;
    max-width: 500px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--text-primary);
    color: white;
    padding: 16px 32px;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: transform 0.2s, box-shadow 0.2s;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.btn-primary img {
    width: 24px;
    height: 24px;
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--bg-primary);
    color: var(--text-primary);
    padding: 16px 32px;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    border: 2px solid var(--border-color);
    transition: border-color 0.2s, background 0.2s;
}

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

.hero-image {
    display: flex;
    justify-content: center;
}

.hero-image img {
    max-width: 300px;
    border-radius: 40px;
    box-shadow: 0 25px 80px rgba(124, 58, 237, 0.3);
}

/* Features Section */
.features {
    padding: 100px 24px;
    background: var(--bg-primary);
}

.section-container {
    max-width: 1200px;
    margin: 0 auto;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.section-header p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.feature-card {
    background: var(--bg-secondary);
    border-radius: 16px;
    padding: 32px;
    transition: transform 0.2s, box-shadow 0.2s;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

.feature-icon {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    font-size: 1.5rem;
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Decades Section */
.decades {
    padding: 100px 24px;
    background: var(--bg-dark);
    color: white;
}

.decades .section-header h2 {
    color: white;
}

.decades .section-header p {
    color: var(--text-light);
}

.decades-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.decade-card {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    padding: 24px;
    text-align: center;
    transition: transform 0.2s, background 0.2s;
}

.decade-card:hover {
    transform: scale(1.05);
    background: rgba(255, 255, 255, 0.15);
}

.decade-card h3 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--primary-light);
}

.decade-card p {
    color: var(--text-light);
    font-size: 0.9rem;
}

/* Screenshots Section */
.screenshots {
    padding: 100px 24px;
    background: var(--bg-secondary);
}

.screenshots-scroll {
    display: flex;
    gap: 24px;
    overflow-x: auto;
    padding: 20px 0;
    scroll-snap-type: x mandatory;
}

.screenshots-scroll img {
    width: 280px;
    border-radius: 24px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
    scroll-snap-align: center;
    flex-shrink: 0;
}

/* CTA Section */
.cta {
    padding: 100px 24px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    text-align: center;
    color: white;
}

.cta h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.cta p {
    font-size: 1.1rem;
    opacity: 0.9;
    margin-bottom: 32px;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

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

.cta .btn-primary:hover {
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

/* Footer */
.footer {
    background: var(--bg-dark);
    color: var(--text-light);
    padding: 60px 24px 30px;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 60px;
    margin-bottom: 40px;
}

.footer-brand p {
    margin-top: 16px;
    font-size: 0.9rem;
}

.footer-links h4 {
    color: white;
    font-size: 1rem;
    margin-bottom: 16px;
}

.footer-links ul {
    list-style: none;
}

.footer-links a {
    color: var(--text-light);
    text-decoration: none;
    font-size: 0.9rem;
    display: block;
    padding: 6px 0;
    transition: color 0.2s;
}

.footer-links a:hover {
    color: white;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
}

/* Page Header */
.page-header {
    padding: 140px 24px 60px;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
    text-align: center;
}

.page-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.page-header p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* Content Sections */
.content-section {
    padding: 60px 24px;
    background: var(--bg-primary);
}

.content-container {
    max-width: 800px;
    margin: 0 auto;
}

.content-container h2 {
    font-size: 1.75rem;
    font-weight: 600;
    margin-top: 40px;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.content-container h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-top: 32px;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.content-container p {
    margin-bottom: 16px;
    color: var(--text-secondary);
}

.content-container ul,
.content-container ol {
    margin-bottom: 16px;
    padding-left: 24px;
    color: var(--text-secondary);
}

.content-container li {
    margin-bottom: 8px;
}

.content-container a {
    color: var(--primary-color);
    text-decoration: none;
}

.content-container a:hover {
    text-decoration: underline;
}

/* Support Cards */
.support-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-top: 40px;
}

.support-card {
    background: var(--bg-secondary);
    border-radius: 16px;
    padding: 32px;
    text-align: center;
}

.support-card .icon {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 1.75rem;
}

.support-card h3 {
    margin-bottom: 12px;
    color: var(--text-primary);
}

.support-card p {
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.support-card a {
    color: var(--primary-color);
    font-weight: 600;
    text-decoration: none;
}

/* Help Accordion */
.help-section {
    margin-top: 40px;
}

.help-category {
    margin-bottom: 32px;
}

.help-category h3 {
    font-size: 1.25rem;
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--primary-color);
    display: inline-block;
}

.help-item {
    background: var(--bg-secondary);
    border-radius: 12px;
    margin-bottom: 12px;
    overflow: hidden;
}

.help-item summary {
    padding: 20px 24px;
    cursor: pointer;
    font-weight: 600;
    color: var(--text-primary);
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.help-item summary::-webkit-details-marker {
    display: none;
}

.help-item summary::after {
    content: '+';
    font-size: 1.5rem;
    color: var(--primary-color);
}

.help-item[open] summary::after {
    content: '-';
}

.help-item .help-content {
    padding: 0 24px 20px;
    color: var(--text-secondary);
}

/* Responsive */
@media (max-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .decades-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 40px;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .mobile-menu-btn {
        display: block;
    }

    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-content h1 {
        font-size: 2.5rem;
    }

    .hero-content p {
        margin-left: auto;
        margin-right: auto;
    }

    .hero-buttons {
        justify-content: center;
    }

    .hero-image {
        order: -1;
    }

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

    .decades-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }
}