:root {
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f8fafc;
    --text-secondary: #e2e8f0;
    --text-muted: #94a3b8;
    --accent-primary: #38bdf8;
    --accent-hover: #0ea5e9;
    --accent-glow: rgba(56, 189, 248, 0.2);
    --border-color: #334155;
    --border-radius: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --container-width: 1200px;
}

*, *::before, *::after {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: var(--font-family);
    background-color: var(--bg-primary);
    background-image: 
        radial-gradient(circle at 15% 50%, rgba(56, 189, 248, 0.08) 0%, transparent 25%),
        radial-gradient(circle at 85% 30%, rgba(14, 165, 233, 0.08) 0%, transparent 25%);
    color: var(--text-primary);
    font-size: 16px;
    line-height: 1.6;
    overflow-x: hidden;
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; padding: 0; margin: 0; }

.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

header {
    padding: 2rem 0;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    z-index: 10;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, #fff 0%, #38bdf8 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo img {
    width: 32px;
    height: 32px;
    filter: drop-shadow(0 0 3px var(--accent-primary));
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-secondary);
    font-weight: 500;
    transition: var(--transition);
    font-size: 0.95rem;
}

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

.hero-section {
    padding-top: 5rem;
    padding-bottom: 6rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    display: flex;
    justify-content: center;
    gap: 6rem;
    transform: rotate(-12deg);
    z-index: 0;
    opacity: 0.4;
    pointer-events: none;
    mask-image: linear-gradient(to bottom, black 20%, transparent 80%);
    -webkit-mask-image: linear-gradient(to bottom, black 20%, transparent 80%);
}

.hero-col {
    display: flex;
    flex-direction: column;
}

.hero-col-track {
    display: flex;
    flex-direction: column;
    gap: 5rem;
    animation: heroScroll 80s linear infinite;
    will-change: transform;
}

.hero-col:nth-child(2n) .hero-col-track {
    animation-duration: 100s;
    transform: translateY(-20%);
}

.hero-icon-img {
    width: 70px;
    height: 70px;
    object-fit: contain;
    filter: blur(1px);
    opacity: 0.6;
    transition: opacity 0.3s;
}

@keyframes heroScroll {
    0% { transform: translateY(0); }
    100% { transform: translateY(-50%); }
}

.hero-content {
    position: relative;
    z-index: 2;
}

.hero-badge {
    display: inline-block;
    background: rgba(56, 189, 248, 0.1);
    border: 1px solid rgba(56, 189, 248, 0.2);
    color: var(--accent-primary);
    padding: 0.5rem 1rem;
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    animation: fadeInDown 0.8s ease-out;
}

h1 {
    font-size: 4rem;
    font-weight: 800;
    line-height: 1.1;
    margin: 0 0 1.5rem 0;
    letter-spacing: -0.02em;
    background: linear-gradient(180deg, #fff 0%, #cbd5e1 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: fadeIn 1s ease-out;
}

.hero-text {
    font-size: 1.25rem;
    color: var(--text-muted);
    max-width: 700px;
    margin: 0 auto 3rem auto;
    animation: fadeIn 1.2s ease-out;
    position: relative;
    z-index: 2;
}

.downloads-section {
    background: rgba(30, 41, 59, 0.4);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    padding: 5rem 0;
    margin-bottom: 0;
}

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

.section-header h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.section-header p {
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto;
}

.download-category {
    margin-bottom: 3rem;
}

.category-title {
    text-align: center;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--accent-primary);
    margin-bottom: 1.5rem;
    font-weight: 700;
    opacity: 0.9;
    display: block;
}

.center-card-row {
    display: flex;
    justify-content: center;
}

.center-card-row .card {
    max-width: 350px;
    width: 100%;
}

.grid-2 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    max-width: 800px;
    margin: 0 auto;
}

.card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    height: 100%;
    text-decoration: none;
    color: var(--text-primary);
}

.card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-primary);
    box-shadow: 0 20px 40px -15px var(--accent-glow);
    background-color: #243042;
}

.card-icon {
    width: 64px;
    height: 64px;
    margin-bottom: 1.5rem;
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
}

.card h3 {
    margin: 0 0 0.5rem 0;
    font-size: 1.25rem;
}

.card p {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin: 0;
}

.logo-selkies { background-image: url('img/selkies.svg'); }
.logo-chrome { background-image: url('img/chrome.svg'); }
.logo-firefox { background-image: url('img/firefox.svg'); }
.logo-ios { background-image: url('img/ios.svg'); }
.logo-android { background-image: url('img/android.svg'); }

.tech-block {
    margin-top: 5rem;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    text-align: left;
}

.tech-block.reversed {
    direction: rtl;
}

.tech-block.reversed .tech-text {
    direction: ltr;
}

.tech-visual {
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    padding: 2rem;
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.tech-visual img {
    width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.3);
    border: 1px solid var(--border-color);
    cursor: zoom-in;
    transition: var(--transition);
}

.tech-visual img:hover {
    filter: brightness(1.1);
}

.tech-visual video {
    width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.3);
    border: 1px solid var(--border-color);
}

.tech-visual::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--border-radius);
    padding: 1px;
    background: linear-gradient(45deg, transparent, var(--accent-primary), transparent);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    pointer-events: none;
}

.tech-text h3 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--accent-primary);
    margin-top: 0;
}

.tech-text p {
    color: var(--text-muted);
    margin-bottom: 1.5rem;
}

.code-block {
    background: #0f172a;
    padding: 1rem;
    border-radius: 8px;
    overflow-x: auto;
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.9rem;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    white-space: pre-wrap;
    word-break: break-word;
    position: relative;
    padding-top: 2.5rem;
    text-align: left;
    direction: ltr;
}

.copy-btn {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.75rem;
    padding: 4px 8px;
    transition: all 0.2s;
}

.copy-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    color: #fff;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin: 4rem 0;
}

.feature-item {
    padding: 2rem;
    background: rgba(255, 255, 255, 0.03);
    border-radius: var(--border-radius);
    border: 1px solid transparent;
    transition: var(--transition);
}

.feature-item:hover {
    border-color: var(--border-color);
    background: rgba(255, 255, 255, 0.05);
}

.feature-icon {
    color: var(--accent-primary);
    font-size: 1.5rem;
    margin-bottom: 1rem;
    display: block;
}

.feature-item h3 {
    margin: 0 0 1rem 0;
    font-size: 1.25rem;
}

.feature-item p {
    color: var(--text-muted);
    margin: 0;
    font-size: 0.95rem;
}

.app-scroller {
    padding: 5rem 0;
    overflow: hidden;
    background: linear-gradient(to bottom, rgba(30, 41, 59, 0.4), var(--bg-primary));
    position: relative;
    border-bottom: 1px solid var(--border-color);
    transform: translate3d(0,0,0); 
}

.app-scroller::before,
.app-scroller::after {
    content: "";
    position: absolute;
    top: 0;
    width: 150px;
    height: 100%;
    z-index: 2;
    pointer-events: none;
}

.app-scroller::before {
    left: 0;
    background: linear-gradient(to right, var(--bg-primary), transparent);
}

.app-scroller::after {
    right: 0;
    background: linear-gradient(to left, var(--bg-primary), transparent);
}

.scroller-track {
    display: flex;
    gap: 2rem;
    width: max-content;
}

.sliding-track {
    display: flex;
    gap: 2rem;
    padding-right: 2rem;
    width: max-content;
    animation: scroll 60s linear infinite;
    will-change: transform; 
}

.app-card {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    width: 180px;
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    text-align: center;
    text-decoration: none;
}

.app-card:hover {
    transform: scale(1.05);
    background: #475569;
    border-color: var(--accent-primary);
    z-index: 5;
}

.app-card img {
    width: 80px;
    height: 80px;
    object-fit: contain;
    margin-bottom: 1rem;
    filter: drop-shadow(0 4px 6px rgba(0,0,0,0.2));
}

.app-card span {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.lightbox-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(15, 23, 42, 0.95);
    z-index: 9999;
    display: none;
    justify-content: center;
    align-items: center;
    backdrop-filter: blur(5px);
    cursor: zoom-out;
    padding: 1rem;
}

.lightbox-overlay img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    border-radius: 8px;
    box-shadow: 0 0 50px rgba(0,0,0,0.5);
    animation: fadeIn 0.3s ease-out;
}

@keyframes scroll {
    0% { transform: translate3d(0, 0, 0); }
    100% { transform: translate3d(-100%, 0, 0); }
}

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

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

.tech-section {
    padding: 6rem 0;
    border-top: 1px solid var(--border-color);
}

.highlight {
    color: var(--accent-primary);
    font-weight: 700;
}

footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 4rem 0;
    margin-top: auto;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 2rem;
}

.footer-links {
    display: flex;
    gap: 2rem;
}

.footer-links a:hover {
    color: var(--accent-primary);
}

@media (max-width: 768px) {
    h1 { font-size: 2.5rem; }
    .hero-section { padding-top: 8rem; }
    .tech-block, .tech-block.reversed { grid-template-columns: 1fr; gap: 2rem; direction: ltr; }
    .tech-block.reversed .tech-text { direction: ltr; }
    .nav-links { display: none; } 
    .container { padding: 0 1rem; }
    .center-card-row .card { max-width: 100%; }
    .tech-section { padding-bottom: 8rem; }
}