/* Blender 3D — стили по образцу example */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
    --primary: #ea7600;
    --primary-dark: #c86400;
    --secondary: #265787;
    --dark: #1a1a1a;
    --dark-2: #252525;
    --light: #f5f5f5;
    --white: #fff;
    --text: #333;
    --text-muted: #666;
    --radius: 12px;
    --radius-sm: 8px;
    --shadow: 0 4px 20px rgba(0,0,0,0.08);
    --shadow-hover: 0 8px 30px rgba(0,0,0,0.12);
    --transition: 0.25s ease;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.6;
    color: var(--text);
    overflow-x: hidden;
    background: var(--light);
}

.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* Particles */
.particles { position: fixed; inset: 0; pointer-events: none; z-index: 0; overflow: hidden; }
.particle {
    position: absolute; width: 4px; height: 4px; background: var(--primary); border-radius: 50%;
    opacity: 0.15; animation: float 15s infinite ease-in-out;
}
.particle:nth-child(1){ left: 10%; top: 20%; animation-delay: 0s; }
.particle:nth-child(2){ left: 80%; top: 40%; animation-delay: -2s; }
.particle:nth-child(3){ left: 30%; top: 70%; animation-delay: -4s; }
.particle:nth-child(4){ left: 60%; top: 15%; animation-delay: -6s; }
.particle:nth-child(5){ left: 90%; top: 60%; animation-delay: -8s; }
.particle:nth-child(6){ left: 20%; top: 50%; animation-delay: -10s; }
.particle:nth-child(7){ left: 50%; top: 80%; animation-delay: -12s; }
.particle:nth-child(8){ left: 70%; top: 25%; animation-delay: -14s; }
.particle:nth-child(9){ left: 40%; top: 35%; animation-delay: -3s; }
@keyframes float {
    0%, 100% { transform: translate(0,0) scale(1); opacity: 0.1; }
    25% { transform: translate(20px,-30px) scale(1.2); opacity: 0.2; }
    50% { transform: translate(-15px,20px) scale(0.9); opacity: 0.15; }
    75% { transform: translate(10px,10px) scale(1.1); opacity: 0.18; }
}

/* Top bar */
.top-bar {
    position: sticky; top: 0; z-index: 1000;
    background: var(--dark); color: var(--white);
    padding: 0.75rem 0; box-shadow: 0 2px 15px rgba(0,0,0,0.2);
}
.top-bar-content { display: flex; justify-content: space-between; align-items: center; }
.brand { display: flex; align-items: center; gap: 12px; }
.brand-logo img { height: 42px; width: auto; display: block; }
.brand-name { font-size: 1.35rem; font-weight: 700; }
.brand-name span { color: var(--primary); }
.nav-links { display: flex; gap: 1.5rem; align-items: center; }
.nav-links a {
    color: var(--white); text-decoration: none; font-weight: 500; font-size: 0.95rem;
    opacity: 0.9; transition: var(--transition);
}
.nav-links a:hover { color: var(--primary); opacity: 1; }
.mobile-menu-btn {
    display: none; background: none; border: none; color: var(--white);
    font-size: 1.5rem; cursor: pointer; padding: 0.25rem;
}

/* Main header */
.main-header {
    position: relative; z-index: 1;
    background: linear-gradient(135deg, var(--dark) 0%, var(--secondary) 50%, var(--dark-2) 100%);
    padding: 3rem 0 4rem; color: var(--white);
}
.main-header .header-content {
    display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; align-items: center;
}
.header-text .version-tag {
    display: inline-block; font-size: 0.75rem; font-weight: 600; letter-spacing: 0.05em;
    color: var(--primary); margin-bottom: 0.75rem;
}
.header-text h1 { font-size: 2.25rem; font-weight: 800; line-height: 1.2; margin-bottom: 1rem; }
.header-text h1 span { color: var(--primary); }
.header-text h1 em { display: block; font-size: 1rem; font-weight: 500; opacity: 0.9; margin-top: 0.35rem; font-style: normal; }
.header-text p { font-size: 1rem; opacity: 0.9; margin-bottom: 1.5rem; line-height: 1.7; }
.header-buttons { display: flex; flex-wrap: wrap; gap: 1rem; margin-bottom: 1.5rem; }
.btn {
    display: inline-flex; align-items: center; gap: 0.5rem;
    padding: 0.85rem 1.5rem; border-radius: var(--radius-sm); font-weight: 600; font-size: 0.95rem;
    text-decoration: none; transition: var(--transition); border: none; cursor: pointer;
}
.btn-primary { background: var(--primary); color: var(--white); }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(234,118,0,0.4); }
.btn-secondary { background: transparent; color: var(--white); border: 2px solid rgba(255,255,255,0.5); }
.btn-secondary:hover { border-color: var(--primary); color: var(--primary); }
.trust-badges { display: flex; flex-wrap: wrap; gap: 1rem; }
.trust-badge {
    font-size: 0.85rem; font-weight: 500; padding: 0.4rem 0.8rem;
    background: rgba(255,255,255,0.1); border-radius: 999px;
}
.header-image { position: relative; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-hover); }
.header-image img { width: 100%; height: auto; display: block; }
.product-badge {
    position: absolute; bottom: 1rem; right: 1rem;
    background: var(--primary); color: var(--white); padding: 0.4rem 0.8rem;
    border-radius: var(--radius-sm); font-size: 0.8rem; font-weight: 600;
}

/* Stats bar */
.stats-bar {
    position: relative; z-index: 1;
    background: var(--white); padding: 1.5rem 0; box-shadow: var(--shadow);
}
.stats-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 2rem; }
.stat-item { text-align: center; }
.stat-item strong { display: block; font-size: 1.25rem; color: var(--secondary); margin-bottom: 0.25rem; }
.stat-item span { font-size: 0.85rem; color: var(--text-muted); }

/* Download section */
.download-section { padding: 3rem 0; position: relative; z-index: 1; }
.download-box {
    background: var(--white); border-radius: var(--radius); padding: 2.5rem;
    box-shadow: var(--shadow); text-align: center; border: 1px solid rgba(234,118,0,0.15);
}
.download-box h2 { font-size: 1.75rem; margin-bottom: 0.5rem; color: var(--text); }
.download-box > p { color: var(--text-muted); margin-bottom: 1.5rem; }
.download-buttons { display: flex; flex-wrap: wrap; justify-content: center; gap: 1rem; margin-bottom: 1.5rem; }
.download-btn {
    display: inline-flex; align-items: center; gap: 0.5rem;
    padding: 1rem 1.75rem; border-radius: var(--radius-sm); font-weight: 600; text-decoration: none;
    transition: var(--transition);
}
.download-btn.primary { background: var(--primary); color: var(--white); }
.download-btn.primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(234,118,0,0.35); }
.download-btn.secondary { background: var(--light); color: var(--text); border: 1px solid #ddd; cursor: pointer; }
.download-btn.secondary:hover { border-color: var(--primary); color: var(--primary); }
#officialLinkBtn { display: inline-flex; align-items: center; justify-content: center; }
.file-specs {
    display: flex; flex-wrap: wrap; justify-content: center; gap: 2rem; font-size: 0.9rem;
    color: var(--text-muted); padding-top: 1rem; border-top: 1px solid #eee;
}
.file-specs strong { display: block; color: var(--text); margin-bottom: 0.2rem; font-size: 0.8rem; }

/* Compatibility notice */
.compatibility-notice { padding: 2rem 0; position: relative; z-index: 1; }
.compat-box {
    display: flex; align-items: flex-start; gap: 1.5rem;
    background: var(--white); border-radius: var(--radius); padding: 1.5rem 2rem;
    box-shadow: var(--shadow); border-left: 4px solid var(--primary);
}
.compat-icon { font-size: 2rem; flex-shrink: 0; }
.compat-content h3 { font-size: 1.2rem; margin-bottom: 0.5rem; color: var(--text); }
.compat-content p { color: var(--text-muted); font-size: 0.95rem; line-height: 1.6; }

/* Section header */
.section-header { text-align: center; margin-bottom: 2rem; }
.section-header h2 { font-size: 2rem; font-weight: 800; color: var(--text); }
.section-header h2 span { color: var(--primary); }
.section-header p { color: var(--text-muted); margin-top: 0.5rem; }

/* About / Intro */
#about { padding: 3rem 0; position: relative; z-index: 1; }
.intro-box {
    max-width: 800px; margin: 0 auto; background: var(--white); padding: 2rem;
    border-radius: var(--radius); box-shadow: var(--shadow);
}
.intro-box p { margin-bottom: 1rem; line-height: 1.7; color: var(--text); }
.intro-box p:last-child { margin-bottom: 0; }

/* Features */
.features-section { padding: 3rem 0; position: relative; z-index: 1; }
.features-grid {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 1.5rem;
}
.feature-card {
    background: var(--white); padding: 1.5rem; border-radius: var(--radius);
    box-shadow: var(--shadow); transition: var(--transition);
    border-left: 4px solid var(--primary);
}
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.feature-icon { font-size: 2rem; margin-bottom: 0.75rem; }
.feature-card h3 { font-size: 1.1rem; margin-bottom: 0.5rem; color: var(--secondary); }
.feature-card p { font-size: 0.9rem; color: var(--text-muted); line-height: 1.6; }

/* Compact cards (requirements, addons) */
.compact-info-section { padding: 3rem 0; position: relative; z-index: 1; }
.compact-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 1.5rem;
}
.compact-grid.one-col { grid-template-columns: 1fr; max-width: 700px; margin: 0 auto; }
.compact-card {
    background: var(--white); border-radius: var(--radius); padding: 1.5rem;
    box-shadow: var(--shadow);
}
.compact-header { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 1rem; }
.compact-icon { font-size: 1.5rem; }
.compact-header h3 { font-size: 1.15rem; color: var(--text); }
.req-list { list-style: none; }
.req-list li { padding: 0.4rem 0; font-size: 0.9rem; color: var(--text-muted); line-height: 1.5; border-bottom: 1px solid #eee; }
.req-list li:last-child { border-bottom: none; }
.req-list strong { color: var(--text); }
.compact-note { margin-top: 1rem; font-size: 0.9rem; color: var(--text-muted); font-style: italic; }

/* Tabs */
.tabs-nav { display: flex; gap: 0.5rem; margin-bottom: 1.5rem; flex-wrap: wrap; justify-content: center; }
.tab-btn {
    padding: 0.75rem 1.25rem; border-radius: var(--radius-sm); font-weight: 600; font-size: 0.95rem;
    background: var(--light); color: var(--text-muted); border: 1px solid #ddd; cursor: pointer; transition: var(--transition);
}
.tab-btn:hover { color: var(--primary); border-color: var(--primary); }
.tab-btn.active { background: var(--primary); color: var(--white); border-color: var(--primary); }
.tab-content { display: none; }
.tab-content.active { display: block; }

/* Screenshots — 2 колонки, max-width 900px, 16/10 */
#screenshots { padding: 3rem 0; position: relative; z-index: 1; }
#screenshots .container { max-width: 900px; margin-left: auto; margin-right: auto; }
.screenshots-grid {
    display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem;
}
.screenshot-card {
    border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow);
    cursor: pointer; transition: var(--transition); background: var(--white);
}
.screenshot-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.screenshot-card .screenshot-img-wrap { aspect-ratio: 16/10; overflow: hidden; }
.screenshot-card img { width: 100%; height: 100%; object-fit: cover; display: block; }
.screenshot-label {
    padding: 0.75rem; font-weight: 600; font-size: 0.9rem; color: var(--text); background: var(--white);
    background: linear-gradient(to top, rgba(0,0,0,0.02), transparent);
}

/* Steps (how to use) */
.steps-section { padding: 3rem 0; position: relative; z-index: 1; background: var(--white); }
.steps-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1.5rem;
}
.step-card {
    background: var(--light); padding: 1.5rem; border-radius: var(--radius);
    border-top: 4px solid var(--primary); transition: var(--transition);
}
.step-card:hover { box-shadow: var(--shadow); }
.step-icon { font-size: 2rem; margin-bottom: 0.75rem; }
.step-card h3 { font-size: 1.1rem; margin-bottom: 0.5rem; color: var(--secondary); }
.step-card p { font-size: 0.9rem; color: var(--text-muted); line-height: 1.6; }
.step-card code { background: rgba(0,0,0,0.06); padding: 0.2rem 0.4rem; border-radius: 4px; font-size: 0.85em; }

/* Tips (who for) */
.tips-section { padding: 3rem 0; position: relative; z-index: 1; }
.tips-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 1.5rem;
}
.tip-card {
    display: flex; gap: 1rem; background: var(--white); padding: 1.5rem;
    border-radius: var(--radius); box-shadow: var(--shadow); transition: var(--transition);
}
.tip-card:hover { box-shadow: var(--shadow-hover); }
.tip-icon { font-size: 2rem; flex-shrink: 0; }
.tip-content h4 { font-size: 1.05rem; margin-bottom: 0.4rem; color: var(--secondary); }
.tip-content p { font-size: 0.9rem; color: var(--text-muted); line-height: 1.6; }

/* Почему мы */
.why-section { padding: 3rem 0; position: relative; z-index: 1; background: var(--white); }
.why-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1.5rem; }
.why-card { background: var(--light); padding: 1.5rem; border-radius: var(--radius); box-shadow: var(--shadow); transition: var(--transition); border-top: 4px solid var(--primary); }
.why-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.why-icon { font-size: 2rem; margin-bottom: 0.75rem; }
.why-card h3 { font-size: 1.1rem; margin-bottom: 0.5rem; color: var(--secondary); }
.why-card p { font-size: 0.9rem; color: var(--text-muted); line-height: 1.6; }

/* Лицензии */
.license-section { padding: 3rem 0; position: relative; z-index: 1; }
.license-note { text-align: center; margin-bottom: 1.5rem; color: var(--text-muted); font-size: 1rem; line-height: 1.6; }
.license-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 1.5rem; max-width: 600px; margin: 0 auto; }
.license-card { background: var(--white); padding: 1.5rem; border-radius: var(--radius); box-shadow: var(--shadow); border-left: 4px solid #ddd; }
.license-card.highlight { border-left-color: var(--primary); background: rgba(234,118,0,0.05); }
.license-card h3 { font-size: 1.15rem; margin-bottom: 0.75rem; color: var(--text); }
.license-card ul { list-style: none; }
.license-card li { padding: 0.35rem 0; font-size: 0.9rem; color: var(--text-muted); line-height: 1.5; padding-left: 1.25rem; position: relative; }
.license-card li::before { content: '✓'; position: absolute; left: 0; color: var(--primary); font-weight: bold; }

/* Сравнение */
.comparison-section { padding: 3rem 0; position: relative; z-index: 1; background: var(--white); }
.comparison-wrap { overflow-x: auto; border-radius: var(--radius); box-shadow: var(--shadow); }
.comparison-table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
.comparison-table th, .comparison-table td { padding: 0.75rem 1rem; text-align: left; border-bottom: 1px solid #eee; }
.comparison-table th { background: var(--light); font-weight: 600; color: var(--text); }
.comparison-table tbody tr:hover { background: rgba(0,0,0,0.02); }
.comparison-table .highlight-col { background: rgba(234,118,0,0.08); font-weight: 600; color: var(--secondary); }

/* Альтернативы */
.alternatives-section { padding: 3rem 0; position: relative; z-index: 1; }
.alternatives-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; }
.alt-card { background: var(--white); padding: 1.5rem; border-radius: var(--radius); box-shadow: var(--shadow); transition: var(--transition); }
.alt-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.alt-card h4 { font-size: 1.1rem; margin-bottom: 0.5rem; color: var(--secondary); }
.alt-card p { font-size: 0.9rem; color: var(--text-muted); line-height: 1.6; margin-bottom: 0.75rem; }
.alt-tag { display: inline-block; font-size: 0.75rem; padding: 0.25rem 0.5rem; background: var(--light); border-radius: 4px; color: var(--text-muted); }

/* Отзывы */
.reviews-section { padding: 3rem 0; position: relative; z-index: 1; background: var(--light); }
.reviews-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1.5rem; }
.review-card { background: var(--white); padding: 1.5rem; border-radius: var(--radius); box-shadow: var(--shadow); transition: var(--transition); }
.review-card:hover { box-shadow: var(--shadow-hover); }
.review-avatar { width: 48px; height: 48px; border-radius: 50%; background: var(--primary); color: var(--white); display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 0.9rem; margin-bottom: 0.75rem; }
.review-card h4 { font-size: 1rem; margin-bottom: 0.35rem; color: var(--text); }
.review-stars { color: #f0ad4e; font-size: 0.9rem; margin-bottom: 0.5rem; }
.review-card p { font-size: 0.9rem; color: var(--text-muted); line-height: 1.6; }

/* Toast */
.toast {
    position: fixed; bottom: 2rem; left: 50%; transform: translateX(-50%) translateY(100px);
    background: #2e7d32; color: var(--white); padding: 0.75rem 1.5rem; border-radius: var(--radius-sm);
    display: flex; align-items: center; gap: 0.5rem; font-weight: 500; z-index: 3000;
    box-shadow: var(--shadow-hover); opacity: 0; visibility: hidden; transition: 0.3s ease;
}
.toast.show { transform: translateX(-50%) translateY(0); opacity: 1; visibility: visible; }
.toast-icon { font-size: 1.25rem; }

/* Form select */
.form-group select {
    width: 100%; padding: 0.75rem 1rem; border: 1px solid #ddd; border-radius: var(--radius-sm);
    font-size: 1rem; font-family: inherit; background: var(--white); cursor: pointer; transition: var(--transition);
}
.form-group select:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(234,118,0,0.15); }

/* Pros / Cons */
.pros-cons-section { padding: 3rem 0; position: relative; z-index: 1; background: var(--white); }
.pros-cons-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 2rem;
}
.pros-card, .cons-card {
    padding: 2rem; border-radius: var(--radius); box-shadow: var(--shadow);
}
.pros-card { border-left: 4px solid #28a745; background: var(--white); }
.cons-card { border-left: 4px solid #dc3545; background: var(--white); }
.pros-card h3, .cons-card h3 { font-size: 1.25rem; margin-bottom: 1rem; }
.pros-card h3 { color: #28a745; }
.cons-card h3 { color: #dc3545; }
.pros-card ul, .cons-card ul { list-style: none; }
.pros-card li, .cons-card li { padding: 0.4rem 0; padding-left: 1.25rem; position: relative; font-size: 0.95rem; line-height: 1.5; }
.pros-card li::before { content: '✓'; position: absolute; left: 0; color: #28a745; font-weight: bold; }
.cons-card li::before { content: '✗'; position: absolute; left: 0; color: #dc3545; font-weight: bold; }

/* FAQ */
#faq { padding: 3rem 0; position: relative; z-index: 1; }
.faq-grid { max-width: 800px; margin: 0 auto; }
.faq-item {
    background: var(--white); margin-bottom: 0.75rem; border-radius: var(--radius-sm);
    box-shadow: 0 1px 10px rgba(0,0,0,0.06); overflow: hidden;
}
.faq-question {
    padding: 1.15rem 1.25rem; font-weight: 600; cursor: pointer; display: flex; justify-content: space-between; align-items: center;
    transition: var(--transition); color: var(--text);
}
.faq-question:hover { background: var(--light); }
.faq-question::after { content: '+'; font-size: 1.25rem; color: var(--primary); }
.faq-item.open .faq-question::after { content: '−'; }
.faq-answer {
    max-height: 0; overflow: hidden; transition: max-height 0.3s ease;
    padding: 0 1.25rem; font-size: 0.95rem; color: var(--text-muted); line-height: 1.6;
}
.faq-item.open .faq-answer { max-height: 500px; padding: 0 1.25rem 1.15rem; }

/* Feedback form */
.feedback-section { padding: 3rem 0; position: relative; z-index: 1; }
.feedback-container { max-width: 600px; margin: 0 auto; }
.feedback-container form {
    background: var(--white); padding: 2rem; border-radius: var(--radius);
    box-shadow: var(--shadow);
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.form-group { margin-bottom: 1rem; }
.form-group.full-width { grid-column: 1 / -1; }
.form-group label { display: block; font-weight: 600; margin-bottom: 0.4rem; color: var(--text); font-size: 0.9rem; }
.form-group input, .form-group textarea {
    width: 100%; padding: 0.75rem 1rem; border: 1px solid #ddd; border-radius: var(--radius-sm);
    font-size: 1rem; font-family: inherit; transition: var(--transition);
}
.form-group input:focus, .form-group textarea:focus {
    outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(234,118,0,0.15);
}
.form-group textarea { min-height: 120px; resize: vertical; }

/* Footer */
footer {
    position: relative; z-index: 1;
    background: var(--dark); color: var(--white); padding: 3rem 0 1.5rem;
    border-top: 1px solid rgba(234,118,0,0.2);
}
.footer-content { display: grid; grid-template-columns: 1fr auto; gap: 3rem; margin-bottom: 2rem; }
.footer-left { max-width: 320px; }
.footer-brand { display: flex; align-items: center; gap: 10px; margin-bottom: 0.75rem; }
.footer-brand-icon img { height: 36px; width: auto; }
.footer-brand span { font-size: 1.25rem; font-weight: 700; }
.footer-text { font-size: 0.9rem; opacity: 0.8; line-height: 1.6; }
.footer-links-grid { display: flex; gap: 2.5rem; }
.footer-section h4 { font-size: 0.95rem; margin-bottom: 0.75rem; color: var(--primary); }
.footer-section ul { list-style: none; }
.footer-section li { margin-bottom: 0.4rem; }
.footer-section a { color: var(--white); text-decoration: none; opacity: 0.8; font-size: 0.9rem; transition: var(--transition); }
.footer-section a:hover { color: var(--primary); opacity: 1; }
.footer-bottom { padding-top: 1.5rem; border-top: 1px solid rgba(255,255,255,0.1); text-align: center; }
.footer-bottom p { font-size: 0.85rem; opacity: 0.7; }
.footer-bottom a { color: var(--primary); text-decoration: none; }

/* Back to top */
.back-to-top {
    position: fixed; bottom: 2rem; right: 2rem; z-index: 999;
    width: 48px; height: 48px; border-radius: 50%;
    background: var(--primary); color: var(--white); border: none;
    font-size: 1.25rem; cursor: pointer; box-shadow: var(--shadow-hover);
    opacity: 0; visibility: hidden; transition: var(--transition);
}
.back-to-top.visible { opacity: 1; visibility: visible; }
.back-to-top:hover { background: var(--primary-dark); transform: translateY(-3px); }

/* Lightbox */
.lightbox {
    position: fixed; inset: 0; z-index: 2000; background: rgba(0,0,0,0.92);
    display: flex; align-items: center; justify-content: center;
    opacity: 0; visibility: hidden; transition: var(--transition);
}
.lightbox.open { opacity: 1; visibility: visible; }
.lightbox-img, #lightbox-img { max-width: 90%; max-height: 90vh; object-fit: contain; }
.lightbox-close {
    position: absolute; top: 1.5rem; right: 2rem; color: var(--white);
    font-size: 2.5rem; cursor: pointer; line-height: 1; z-index: 2001;
}
.lightbox-nav {
    position: absolute; top: 50%; transform: translateY(-50%);
    background: rgba(255,255,255,0.1); color: var(--white); border: none;
    width: 50px; height: 50px; border-radius: 50%; font-size: 1.5rem; cursor: pointer;
    transition: var(--transition); z-index: 2001;
}
.lightbox-nav:hover { background: var(--primary); }
.lightbox-prev { left: 1.5rem; }
.lightbox-next { right: 1.5rem; }

/* Responsive */
@media (max-width: 900px) {
    .main-header .header-content { grid-template-columns: 1fr; text-align: center; }
    .header-image { max-width: 500px; margin: 0 auto; }
    .header-buttons { justify-content: center; }
    .trust-badges { justify-content: center; }
    .footer-content { grid-template-columns: 1fr; text-align: center; }
    .footer-left { max-width: none; }
    .footer-links-grid { justify-content: center; }
}

@media (max-width: 900px) {
    .alternatives-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
    .screenshots-grid { grid-template-columns: 1fr; }
    .alternatives-grid { grid-template-columns: 1fr; }
    .nav-links { display: none; position: absolute; top: 100%; left: 0; right: 0; background: var(--dark); flex-direction: column; padding: 1rem; gap: 0.5rem; }
    .nav-links.open { display: flex; }
    .mobile-menu-btn { display: block; }
    .header-text h1 { font-size: 1.75rem; }
    .form-row { grid-template-columns: 1fr; }
    .stats-grid { gap: 1.5rem; }
    .stat-item strong { font-size: 1.1rem; }
    .compat-box { flex-direction: column; text-align: center; }
    .back-to-top { bottom: 1rem; right: 1rem; width: 44px; height: 44px; font-size: 1.1rem; }
}

@media (max-width: 480px) {
    .section-header h2 { font-size: 1.5rem; }
    .download-btn { padding: 0.85rem 1.25rem; font-size: 0.9rem; }
    .file-specs { flex-direction: column; gap: 0.75rem; }
}