/* ============================================
   CinéVault — Style Principal
   Mobile-First 640px, Dark Theme, Premium
   ============================================ */

/* ===== RESET & BASE ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #e50914;
    --primary-dark: #b20710;
    --accent: #ff6b35;
    --bg-dark: #0a0a1a;
    --bg-card: #12122a;
    --bg-card-hover: #1a1a3a;
    --text-primary: #ffffff;
    --text-secondary: #a0a0b8;
    --text-muted: #6a6a80;
    --border: rgba(255, 255, 255, 0.08);
    --gradient-main: linear-gradient(135deg, #e50914, #ff6b35);
    --gradient-purple: linear-gradient(135deg, #667eea, #764ba2);
    --gradient-blue: linear-gradient(135deg, #4facfe, #00f2fe);
    --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.3);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: #000;
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    max-width: 640px;
    margin: 0 auto;
    position: relative;
    box-shadow: 0 0 80px rgba(229, 9, 20, 0.06), 0 0 40px rgba(0, 0, 0, 0.8);
    min-height: 100vh;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    text-decoration: none;
    color: inherit;
}

button {
    cursor: pointer;
    border: none;
    background: none;
    font-family: inherit;
    color: inherit;
}

/* ===== UTILITIES ===== */
.gradient-text {
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-container {
    padding: 0 16px;
}

.section-header {
    text-align: center;
    margin-bottom: 28px;
}

.section-tag {
    display: inline-block;
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--primary);
    background: rgba(229, 9, 20, 0.1);
    border: 1px solid rgba(229, 9, 20, 0.3);
    padding: 4px 12px;
    border-radius: 50px;
    margin-bottom: 10px;
}

.section-header h2 {
    font-size: 1.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 6px;
}

.section-header p {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* ===== NAVBAR ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    max-width: 640px;
    z-index: 1000;
    padding: 10px 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: var(--transition);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    background: rgba(10, 10, 26, 0.75);
}

.navbar.scrolled {
    background: rgba(10, 10, 26, 0.95);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.4);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 6px;
}

.brand-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: var(--gradient-main);
    border-radius: 8px;
    font-size: 0.8rem;
    color: white;
}

.brand-text {
    font-size: 1.1rem;
    font-weight: 400;
    letter-spacing: -0.5px;
}

.brand-text strong {
    font-weight: 800;
}

.nav-download-btn {
    font-size: 0.78rem;
    font-weight: 700;
    color: white;
    background: var(--gradient-main);
    padding: 7px 16px;
    border-radius: 50px;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(229, 9, 20, 0.3);
}

.nav-download-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 6px 20px rgba(229, 9, 20, 0.5);
}

/* ===== HERO SECTION ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 80px 16px 50px;
    overflow: hidden;
}

.hero-bg-image {
    position: absolute;
    inset: 0;
    background: url('../images/1fee3481d6d448ebba1da07055eb6019.gif') center center / cover no-repeat;
    z-index: 0;
}

.hero-bg-overlay {
    position: absolute;
    inset: 0;
    background:
        linear-gradient(180deg, rgba(10,10,26,0.7) 0%, rgba(10,10,26,0.5) 30%, rgba(10,10,26,0.75) 70%, rgba(10,10,26,0.95) 100%),
        radial-gradient(ellipse at 30% 40%, rgba(229, 9, 20, 0.12) 0%, transparent 50%),
        radial-gradient(ellipse at 70% 60%, rgba(102, 126, 234, 0.08) 0%, transparent 50%);
    z-index: 1;
}

.hero-particles {
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 2;
}

.hero-particles .particle {
    position: absolute;
    width: 3px;
    height: 3px;
    background: rgba(229, 9, 20, 0.6);
    border-radius: 50%;
    animation: float-particle 6s infinite ease-in-out;
}

.hero-particles .particle:nth-child(2n) {
    background: rgba(102, 126, 234, 0.5);
    animation-duration: 8s;
}

.hero-particles .particle:nth-child(3n) {
    background: rgba(255, 107, 53, 0.5);
    animation-duration: 10s;
}

@keyframes float-particle {
    0%, 100% { transform: translateY(0) translateX(0); opacity: 0; }
    25% { opacity: 1; }
    50% { transform: translateY(-80px) translateX(20px); opacity: 0.5; }
    75% { opacity: 0.3; }
}

.hero-content {
    position: relative;
    z-index: 3;
    text-align: center;
}

.hero-badge {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--accent);
    background: rgba(255, 107, 53, 0.12);
    border: 1px solid rgba(255, 107, 53, 0.3);
    padding: 6px 14px;
    border-radius: 50px;
    margin-bottom: 18px;
    animation: fadeInDown 0.8s ease;
}

.hero-title {
    font-size: 2rem;
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: 14px;
    letter-spacing: -0.5px;
    animation: fadeInUp 0.8s ease 0.2s both;
}

.hero-subtitle {
    font-size: 0.88rem;
    color: var(--text-secondary);
    margin-bottom: 24px;
    line-height: 1.6;
    padding: 0 8px;
    animation: fadeInUp 0.8s ease 0.4s both;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 28px;
    animation: fadeInUp 0.8s ease 0.5s both;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-number {
    font-size: 1.5rem;
    font-weight: 800;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-suffix {
    font-size: 1rem;
    font-weight: 800;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 0.65rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-top: 2px;
}

/* HERO MAIN DOWNLOAD - BIG & PROMINENT */
.hero-main-download {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
    max-width: 340px;
    margin: 0 auto 20px;
    padding: 18px 24px;
    background: var(--gradient-main);
    border-radius: 60px;
    font-weight: 800;
    font-size: 1.05rem;
    color: white;
    box-shadow: 0 8px 35px rgba(229, 9, 20, 0.5), 0 0 60px rgba(229, 9, 20, 0.15);
    transition: var(--transition);
    animation: fadeInUp 0.8s ease 0.6s both, pulse-glow 2.5s infinite 1.5s;
    position: relative;
    overflow: hidden;
}

.hero-main-download::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent 40%, rgba(255,255,255,0.15) 50%, transparent 60%);
    animation: shine-sweep 3s infinite;
}

.hero-main-download:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 12px 45px rgba(229, 9, 20, 0.6), 0 0 80px rgba(229, 9, 20, 0.2);
}

.hero-dl-icon {
    font-size: 1.3rem;
}

.hero-dl-text {
    flex: 1;
    text-align: center;
}

.hero-dl-arrow {
    font-size: 1.2rem;
    opacity: 0.8;
}

@keyframes pulse-glow {
    0%, 100% { box-shadow: 0 8px 35px rgba(229, 9, 20, 0.5), 0 0 60px rgba(229, 9, 20, 0.15); }
    50% { box-shadow: 0 8px 45px rgba(229, 9, 20, 0.7), 0 0 90px rgba(229, 9, 20, 0.25); }
}

@keyframes shine-sweep {
    0% { transform: translateX(-100%) rotate(45deg); }
    30%, 100% { transform: translateX(100%) rotate(45deg); }
}

.hero-trust {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    font-size: 0.75rem;
    color: var(--text-secondary);
    animation: fadeInUp 0.8s ease 0.7s both;
}

.trust-stars {
    color: #ffc107;
    font-size: 0.9rem;
}

/* ===== FEATURES SECTION ===== */
.features {
    padding: 50px 0;
    background: linear-gradient(180deg, var(--bg-dark) 0%, #0d0d24 100%);
}

.features-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 16px;
    display: flex;
    align-items: center;
    gap: 14px;
    transition: var(--transition);
}

.feature-card:hover {
    background: var(--bg-card-hover);
    border-color: rgba(229, 9, 20, 0.2);
}

.feature-icon-wrapper {
    width: 44px;
    height: 44px;
    min-width: 44px;
    border-radius: 12px;
    background: rgba(229, 9, 20, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
}

.feature-icon {
    font-size: 1.3rem;
}

.feature-text h3 {
    font-size: 0.9rem;
    font-weight: 700;
    margin-bottom: 3px;
}

.feature-text p {
    font-size: 0.78rem;
    color: var(--text-secondary);
    line-height: 1.4;
}

/* ===== CATALOGUE SECTION ===== */
.catalogue {
    padding: 50px 0;
    background: var(--bg-dark);
}

.category-tabs {
    display: flex;
    justify-content: center;
    gap: 6px;
    margin-bottom: 24px;
}

.tab-btn {
    padding: 6px 12px;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
    white-space: nowrap;
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    transition: var(--transition);
    flex: 1;
    text-align: center;
}

.tab-btn.active {
    background: var(--gradient-main);
    border-color: transparent;
    color: white;
}

.movies-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
}

.movie-card {
    border-radius: var(--radius-sm);
    overflow: hidden;
    transition: var(--transition);
}

.movie-card:hover {
    transform: translateY(-4px);
}

.movie-poster {
    position: relative;
    aspect-ratio: 2/3;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: 8px 6px;
    overflow: hidden;
}

.movie-poster::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.9) 0%, rgba(0,0,0,0.15) 50%, transparent 100%);
}

.movie-rank {
    position: absolute;
    top: 6px;
    left: 6px;
    font-size: 0.6rem;
    font-weight: 800;
    color: white;
    background: var(--gradient-main);
    width: 22px;
    height: 22px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 3;
}

.movie-rating {
    position: absolute;
    top: 6px;
    right: 6px;
    font-size: 0.58rem;
    font-weight: 600;
    color: #ffc107;
    background: rgba(0, 0, 0, 0.65);
    padding: 2px 5px;
    border-radius: 4px;
    z-index: 3;
}

.movie-quality {
    position: absolute;
    top: 6px;
    right: 48px;
    font-size: 0.5rem;
    font-weight: 700;
    color: white;
    background: rgba(229, 9, 20, 0.8);
    padding: 2px 4px;
    border-radius: 3px;
    z-index: 3;
}

.movie-badge {
    position: absolute;
    bottom: 60px;
    left: 6px;
    font-size: 0.5rem;
    font-weight: 700;
    color: white;
    background: var(--gradient-purple);
    padding: 2px 6px;
    border-radius: 3px;
    z-index: 3;
    letter-spacing: 0.5px;
}

.movie-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.5);
    opacity: 0;
    transition: var(--transition);
    z-index: 4;
}

.movie-card:hover .movie-overlay {
    opacity: 1;
}

.play-btn {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--gradient-main);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
    color: white;
    transition: var(--transition);
}

.play-btn:hover {
    transform: scale(1.1);
}

.movie-info {
    position: relative;
    z-index: 2;
}

.movie-info h4 {
    font-size: 0.68rem;
    font-weight: 700;
    margin-bottom: 3px;
    line-height: 1.2;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.movie-meta {
    display: flex;
    align-items: center;
    gap: 3px;
    font-size: 0.58rem;
    color: var(--text-muted);
}

/* ===== ABOUT SECTION ===== */
.about {
    padding: 50px 0;
    background: linear-gradient(180deg, #0d0d24 0%, var(--bg-dark) 100%);
}

.about-content {
    max-width: 600px;
    margin: 0 auto;
}

.about-lead {
    font-size: 0.92rem;
    line-height: 1.7;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.about-content p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 12px;
}

.about-highlights {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
    margin-top: 24px;
}

.highlight-item {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 12px 6px;
    text-align: center;
}

.highlight-number {
    display: block;
    font-size: 1.3rem;
    font-weight: 800;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 2px;
}

.highlight-label {
    font-size: 0.65rem;
    color: var(--text-secondary);
}

/* ===== FAQ SECTION ===== */
.faq {
    padding: 50px 0;
    background: var(--bg-dark);
}

.faq-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.faq-item {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    overflow: hidden;
    transition: var(--transition);
}

.faq-item:hover {
    border-color: rgba(229, 9, 20, 0.3);
}

.faq-question {
    width: 100%;
    padding: 14px 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    font-size: 0.85rem;
    font-weight: 600;
    text-align: left;
    transition: var(--transition);
}

.faq-toggle {
    font-size: 1.2rem;
    font-weight: 300;
    color: var(--primary);
    transition: var(--transition);
    flex-shrink: 0;
}

.faq-item.active .faq-toggle {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
}

.faq-answer p {
    padding: 0 16px 14px;
    font-size: 0.82rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.faq-item.active .faq-answer {
    max-height: 200px;
}

/* ===== REVIEWS SECTION ===== */
.reviews {
    padding: 50px 0;
    background: linear-gradient(180deg, var(--bg-dark) 0%, #0d0d24 100%);
}

.reviews-grid {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.review-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 16px;
    transition: var(--transition);
}

.review-card:hover {
    border-color: rgba(229, 9, 20, 0.2);
}

.review-stars {
    color: #ffc107;
    font-size: 0.85rem;
    margin-bottom: 8px;
}

.review-text {
    font-size: 0.82rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 12px;
    font-style: italic;
}

.review-author {
    display: flex;
    align-items: center;
    gap: 10px;
}

.review-avatar {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: 700;
    color: white;
    flex-shrink: 0;
}

.review-meta {
    display: block;
    font-size: 0.68rem;
    color: var(--text-muted);
    margin-top: 1px;
}

/* ===== DOWNLOAD CTA ===== */
.download-cta {
    padding: 60px 0 80px;
    background: var(--bg-dark);
    position: relative;
    overflow: hidden;
}

.cta-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(229, 9, 20, 0.12) 0%, transparent 70%);
    animation: cta-breathe 3s ease-in-out infinite;
    pointer-events: none;
}

@keyframes cta-breathe {
    0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 0.6; }
    50% { transform: translate(-50%, -50%) scale(1.3); opacity: 1; }
}

.cta-content {
    position: relative;
    text-align: center;
    z-index: 2;
}

.cta-content h2 {
    font-size: 1.6rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 10px;
}

.cta-content > p {
    font-size: 0.88rem;
    color: var(--text-secondary);
    margin-bottom: 28px;
}

.download-buttons {
    display: flex;
    flex-direction: column;
    gap: 10px;
    align-items: center;
    margin-bottom: 20px;
}

.store-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 24px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, #1a1a2e, #16213e);
    border: 1px solid rgba(255, 255, 255, 0.15);
    transition: var(--transition);
    width: 100%;
    max-width: 260px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}

.store-btn:hover {
    background: linear-gradient(135deg, #222244, #1a2a4a);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.4);
    border-color: rgba(229, 9, 20, 0.3);
}

.store-icon {
    font-size: 1.5rem;
}

.google-play .store-icon {
    color: #4CAF50;
}

.store-text {
    text-align: left;
}

.store-text small {
    font-size: 0.65rem;
    color: var(--text-muted);
    display: block;
}

.store-text strong {
    font-size: 0.95rem;
    font-weight: 700;
}

.cta-info {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
    font-size: 0.78rem;
    color: var(--text-secondary);
}

/* ===== FOOTER ===== */
.footer {
    padding: 40px 0 100px;
    background: #060612;
    border-top: 1px solid var(--border);
}

.footer-container {
    padding: 0 16px;
}

.footer-brand {
    margin-bottom: 24px;
}

.footer-brand .brand-icon {
    display: inline-flex;
    margin-bottom: 6px;
}

.footer-brand .brand-text {
    font-size: 1.1rem;
    display: block;
    margin-bottom: 6px;
}

.footer-brand p {
    font-size: 0.78rem;
    color: var(--text-muted);
}

.footer-links-group {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-bottom: 24px;
}

.footer-col h4 {
    font-size: 0.78rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.footer-col a {
    display: block;
    font-size: 0.72rem;
    color: var(--text-muted);
    margin-bottom: 8px;
    transition: var(--transition);
}

.footer-col a:hover {
    color: var(--text-primary);
}

.footer-bottom {
    border-top: 1px solid var(--border);
    padding-top: 16px;
    text-align: center;
}

.footer-bottom p {
    font-size: 0.68rem;
    color: var(--text-muted);
}

/* ===== FIXED BOTTOM DOWNLOAD BAR ===== */
.bottom-bar {
    position: fixed;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    max-width: 640px;
    padding: 10px 16px;
    padding-bottom: calc(10px + env(safe-area-inset-bottom, 0px));
    background: linear-gradient(180deg, rgba(10,10,26,0) 0%, rgba(10,10,26,0.95) 30%);
    z-index: 999;
    display: flex;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.4s ease;
    pointer-events: none;
}

.bottom-bar.visible {
    opacity: 1;
    pointer-events: auto;
}

.bottom-bar-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    max-width: 400px;
    padding: 14px 20px;
    background: var(--gradient-main);
    border-radius: 50px;
    font-size: 0.88rem;
    font-weight: 700;
    color: white;
    box-shadow: 0 6px 30px rgba(229, 9, 20, 0.5);
    transition: var(--transition);
    animation: bottom-bar-pulse 2s infinite;
}

.bottom-bar-btn:hover {
    transform: scale(1.02);
    box-shadow: 0 8px 40px rgba(229, 9, 20, 0.6);
}

.bottom-bar-icon {
    font-size: 1.1rem;
}

@keyframes bottom-bar-pulse {
    0%, 100% { box-shadow: 0 6px 30px rgba(229, 9, 20, 0.5); }
    50% { box-shadow: 0 6px 40px rgba(229, 9, 20, 0.7), 0 0 60px rgba(229, 9, 20, 0.2); }
}

/* ===== ANIMATIONS ===== */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

.animate-on-scroll {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}