:root {
    --glacial-blue: #AFDBF5;
    --aurora-green: #50C878;
    --tundra-red: #C41E3A;
    --snow-white: #FFFFFF;
    --ice-shadow: rgba(175, 219, 245, 0.3);
    --dark-text: #1a1a1a;
}

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

body {
    font-family: 'Open Sans', sans-serif;
    background: var(--snow-white);
    color: var(--dark-text);
    line-height: 1.6;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Barlow', sans-serif;
    font-weight: 700;
    margin-bottom: 1rem;
}

.top-nav {
    background: var(--snow-white);
    border-bottom: 2px solid var(--glacial-blue);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: 'Barlow', sans-serif;
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--dark-text);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--dark-text);
    font-weight: 600;
    transition: color 0.3s;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--aurora-green);
    transition: width 0.3s;
}

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--aurora-green);
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
}

.mobile-menu {
    display: none;
    background: var(--snow-white);
    border-bottom: 2px solid var(--glacial-blue);
    padding: 1rem;
    flex-direction: column;
    gap: 1rem;
}

.mobile-menu a {
    text-decoration: none;
    color: var(--dark-text);
    font-weight: 600;
    padding: 0.5rem;
}

.hero-split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    min-height: 60vh;
}

.hero-day {
    background: linear-gradient(135deg, #AFDBF5 0%, #87CEEB 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 3rem;
    position: relative;
    overflow: hidden;
}

.hero-day::before {
    content: '';
    position: absolute;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.3) 0%, transparent 70%);
    animation: dayGlow 8s infinite;
}

.hero-night {
    background: linear-gradient(135deg, #001f3f 0%, #003366 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 3rem;
    position: relative;
    overflow: hidden;
}

.hero-night::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, 
        transparent 0%,
        rgba(80, 200, 120, 0.3) 20%,
        rgba(80, 200, 120, 0.5) 40%,
        rgba(100, 149, 237, 0.4) 60%,
        transparent 100%
    );
    animation: aurora 6s infinite alternate;
}

@keyframes dayGlow {
    0%, 100% { transform: translate(-50%, -50%); }
    50% { transform: translate(-30%, -30%); }
}

@keyframes aurora {
    0% { transform: translateX(-20%); opacity: 0.6; }
    100% { transform: translateX(20%); opacity: 1; }
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
}

.hero-day .hero-content {
    color: #001f3f;
}

.hero-night .hero-content {
    color: var(--snow-white);
}

.hero-content h1 {
    font-size: 3.5rem;
    margin-bottom: 0.5rem;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.1);
}

.hero-subtitle {
    font-size: 1.5rem;
    font-weight: 600;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 3rem 2rem;
}

.intro-box {
    background: rgba(175, 219, 245, 0.15);
    backdrop-filter: blur(10px);
    border: 2px solid var(--glacial-blue);
    border-radius: 15px;
    padding: 2.5rem;
    margin-bottom: 3rem;
    position: relative;
    box-shadow: 0 8px 32px rgba(0,0,0,0.1);
}

.badge-2026 {
    position: absolute;
    top: -15px;
    right: 30px;
    background: var(--tundra-red);
    color: white;
    padding: 0.5rem 1.5rem;
    border-radius: 20px;
    font-weight: 700;
    font-size: 0.9rem;
}

.intro-box h2 {
    color: var(--tundra-red);
    font-size: 2rem;
}

.sunlight-tracker {
    background: rgba(80, 200, 120, 0.1);
    border: 2px solid var(--aurora-green);
    border-radius: 15px;
    padding: 2rem;
    margin-bottom: 3rem;
    text-align: center;
}

.sunlight-tracker h3 {
    color: var(--aurora-green);
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
}

.tracker-display {
    margin: 1.5rem 0;
}

.tracker-status {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.daylight-bar {
    width: 100%;
    height: 30px;
    background: rgba(0,0,0,0.1);
    border-radius: 15px;
    overflow: hidden;
}

.daylight-fill {
    height: 100%;
    background: linear-gradient(90deg, #FFD700, #FFA500);
    transition: width 0.5s;
}

.tracker-info {
    font-size: 0.9rem;
    color: #666;
    margin-top: 1rem;
}

.block-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.ice-block {
    background: rgba(175, 219, 245, 0.2);
    backdrop-filter: blur(10px);
    border: 2px solid var(--glacial-blue);
    border-radius: 15px;
    padding: 2rem;
    text-align: center;
    text-decoration: none;
    color: var(--dark-text);
    transition: all 0.3s;
    box-shadow: 0 4px 16px rgba(0,0,0,0.05);
}

.ice-block:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 24px rgba(80, 200, 120, 0.2);
    border-color: var(--aurora-green);
}

.block-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.ice-block h3 {
    color: var(--tundra-red);
    margin-bottom: 0.5rem;
}

footer {
    background: var(--glacial-blue);
    margin-top: 5rem;
    padding: 2rem 0;
}

.footer-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
    text-align: center;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
    margin-bottom: 1rem;
}

.footer-links a {
    text-decoration: none;
    color: var(--dark-text);
    font-weight: 600;
}

.copyright {
    color: var(--dark-text);
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: block;
    }
    
    .mobile-menu.active {
        display: flex;
    }
    
    .hero-split {
        grid-template-columns: 1fr;
    }
    
    .hero-content h1 {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.2rem;
    }
    
    .intro-box {
        padding: 1.5rem;
    }
    
    .block-grid {
        grid-template-columns: 1fr;
    }
    
    .nav-container {
        padding: 1rem;
    }
}