@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@300;400;500;700&display=swap');

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

html, body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    font-family: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: #f8f9fa;
    color: #202124;
}

header {
    background: #ffffff;
    box-shadow: 0 2px 4px rgba(0,0,0,0.08);
    position: sticky;
    top: 0;
    z-index: 100;
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    height: 64px;
}

.nav-links {
    display: flex;
    gap: 0.5rem;
}

nav a {
    color: #5f6368;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-weight: 500;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

nav a:hover {
    background: #f1f3f4;
    color: #1a73e8;
}

nav a.active {
    background: #e8f0fe;
    color: #1a73e8;
}

.nav-icon {
    width: 20px;
    height: 20px;
    fill: currentColor;
}

main {
    flex: 1;
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1.5rem;
    width: 100%;
}

.hero {
    background: #ffffff;
    padding: 3rem 2rem;
    border-radius: 16px;
    text-align: center;
    margin-bottom: 2rem;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.hero h1 {
    font-size: 2.5rem;
    font-weight: 400;
    color: #202124;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.hero p {
    font-size: 1.125rem;
    color: #5f6368;
    margin-bottom: 0.5rem;
}

.time-display {
    margin-top: 1.5rem;
    font-size: 1rem;
    color: #5f6368;
    background: #f1f3f4;
    display: inline-block;
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

.time-display #time {
    font-family: 'Roboto Mono', monospace;
    color: #1a73e8;
    font-weight: 500;
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.card {
    background: #ffffff;
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.card:hover {
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    transform: translateY(-2px);
}

.card h3 {
    font-size: 1.25rem;
    font-weight: 500;
    color: #1a73e8;
    margin-bottom: 0.75rem;
}

.card p {
    color: #5f6368;
    line-height: 1.6;
}

.content {
    background: #ffffff;
    padding: 2rem;
    border-radius: 16px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    margin-bottom: 2rem;
}

.content h2 {
    font-size: 1.5rem;
    font-weight: 500;
    color: #202124;
    margin-bottom: 1.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid #e8eaed;
}

.content p {
    margin-bottom: 1rem;
    line-height: 1.7;
    color: #5f6368;
}

.content ul {
    margin-left: 1.5rem;
    margin-bottom: 1rem;
    color: #5f6368;
}

.content li {
    margin-bottom: 0.5rem;
    line-height: 1.6;
}

.content ul {
    list-style-type: disc;
}

footer {
    background: #ffffff;
    padding: 1.5rem;
    text-align: center;
    color: #5f6368;
    border-top: 1px solid #e8eaed;
    margin-top: auto;
}

footer p {
    font-size: 0.875rem;
}

@media (max-width: 768px) {
    nav {
        flex-wrap: wrap;
        height: auto;
        padding: 1rem;
        gap: 0.5rem;
    }
    
    nav a {
        padding: 0.5rem;
        font-size: 0.9rem;
    }
    
    .nav-icon {
        width: 18px;
        height: 18px;
    }
    
    main {
        margin: 1rem auto;
    }
    
    .hero {
        padding: 2rem 1.5rem;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
}