:root {
    --bg-color: #ffffff;
    --text-color: #111111;
    --text-secondary: #666666;
    --accent-color: #000000;
    --card-bg: #f5f5f7;
    --border-radius: 16px;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #000000;
        --text-color: #ffffff;
        --text-secondary: #a1a1a6;
        --accent-color: #ffffff;
        --card-bg: #1c1c1e;
    }
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", sans-serif;
    -webkit-font-smoothing: antialiased;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}


.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 48px;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 12px;
}

.nav-logo {
    width: 32px;
    height: 32px;
    border-radius: 8px;
}

.brand-name {
    font-weight: 600;
    font-size: 18px;
    letter-spacing: -0.5px;
}

.nav-links {
    display: flex;
    gap: 20px;
}

.social-link {
    color: var(--text-secondary);
    transition: color 0.2s ease;
}

.social-link:hover {
    color: var(--text-color);
}


.hero {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 80px 24px;
    gap: 60px;
}

.hero-content {
    max-width: 600px;
}

.app-icon-large img {
    width: 128px;
    height: 128px;
    border-radius: 28px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    margin-bottom: 32px;
    animation: breathe 4s ease-in-out infinite;
}

@keyframes breathe {
    0%, 100% {
        transform: translateY(0);
        box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    }
    50% {
        transform: translateY(-10px);
        box-shadow: 0 30px 60px rgba(0,0,0,0.15);
    }
}

h1 {
    font-size: 56px;
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -2px;
    margin-bottom: 16px;
    background: linear-gradient(180deg, var(--text-color) 0%, var(--text-secondary) 150%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    font-size: 20px;
    color: var(--text-secondary);
    line-height: 1.5;
    margin-bottom: 40px;
}


.cta-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background-color: var(--accent-color);
    color: var(--bg-color);
    padding: 14px 28px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 600;
    font-size: 16px;
    transition: transform 0.2s ease, opacity 0.2s ease;
}

.download-btn:hover {
    transform: scale(1.02);
    opacity: 0.9;
}

.version-info {
    font-size: 13px;
    color: var(--text-secondary);
    opacity: 0.8;
}

.github-link {
    display: inline-block;
    font-size: 13px;
    color: var(--text-secondary);
    opacity: 0.8;
    text-decoration: none;
}

.github-link:hover {
    color: var(--text-secondary);
    opacity: 1;
}

.footer-link {
    margin-bottom: 6px;
}


.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    max-width: 1000px;
    width: 100%;
    padding: 0 24px;
}

.feature-card {
    background-color: var(--card-bg);
    padding: 32px;
    border-radius: var(--border-radius);
    text-align: left;
    transition: transform 0.2s ease;
}

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

.icon-box {
    margin-bottom: 16px;
    color: var(--text-color);
}

.feature-card h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
}

.feature-card p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.5;
}


footer {
    text-align: center;
    padding: 40px;
    color: var(--text-secondary);
    font-size: 14px;
}

footer a {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
}

footer a:hover {
    text-decoration: underline;
}