:root {
    --primary-bg: #0a0a0a;
    --secondary-bg: #1a1a1a;
    --card-bg: #222222;
    --accent-color: #00d4ff;
    --accent-gradient: linear-gradient(135deg, #00d4ff, #0099cc);
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --hover-glow: 0 0 30px rgba(0, 212, 255, 0.5);
    --border-radius: 15px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Roboto', sans-serif;
    background: var(--primary-bg);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 20%, rgba(0, 212, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(0, 153, 204, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 60%, rgba(0, 212, 255, 0.05) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
    position: relative;
    z-index: 1;
}

.header {
    text-align: center;
    margin-bottom: 4rem;
    animation: slideInDown 1s ease-out;
}

.logo-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.logo {
    width: 80px;
    height: 80px;
    background: var(--accent-gradient);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Orbitron', monospace;
    font-size: 2.5rem;
    font-weight: 900;
    color: white;
    box-shadow: 
        0 10px 30px rgba(0, 212, 255, 0.3),
        0 0 50px rgba(0, 212, 255, 0.2);
    animation: logoFloat 3s ease-in-out infinite;
    position: relative;
}

.logo::before {
    content: '';
    position: absolute;
    inset: -2px;
    background: var(--accent-gradient);
    border-radius: 22px;
    z-index: -1;
    opacity: 0.5;
    filter: blur(10px);
}

@keyframes logoFloat {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-10px) rotate(5deg); }
}

.title {
    font-family: 'Orbitron', monospace;
    font-size: 3rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 0 30px rgba(0, 212, 255, 0.5);
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.2rem;
    margin-top: 0.5rem;
    animation: fadeIn 1s ease-out 0.5s both;
}

.calculator-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.calculator-card {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 2rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    border: 1px solid rgba(0, 212, 255, 0.2);
    position: relative;
    overflow: hidden;
    animation: slideInUp 0.8s ease-out;
}

.calculator-card:nth-child(1) { animation-delay: 0.1s; }
.calculator-card:nth-child(2) { animation-delay: 0.2s; }
.calculator-card:nth-child(3) { animation-delay: 0.3s; }
.calculator-card:nth-child(4) { animation-delay: 0.4s; }
.calculator-card:nth-child(5) { animation-delay: 0.5s; }
.calculator-card:nth-child(6) { animation-delay: 0.6s; }
.calculator-card:nth-child(7) { animation-delay: 0.7s; }
.calculator-card:nth-child(8) { animation-delay: 0.8s; }

.calculator-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 212, 255, 0.1), transparent);
    transition: left 0.5s ease;
}

.calculator-card:hover::before {
    left: 100%;
}

.calculator-card:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: var(--hover-glow);
    border-color: var(--accent-color);
}

.card-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: block;
    animation: bounce 2s infinite;
}

.calculator-card h3 {
    font-family: 'Orbitron', monospace;
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--accent-color);
}

.calculator-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

.card-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: radial-gradient(circle, var(--accent-color) 0%, transparent 70%);
    border-radius: 50%;
    opacity: 0;
    transform: translate(-50%, -50%);
    transition: var(--transition);
    pointer-events: none;
}

.calculator-card:hover .card-glow {
    width: 200px;
    height: 200px;
    opacity: 0.1;
}

.footer {
    text-align: center;
    padding: 2rem 0;
    border-top: 1px solid rgba(0, 212, 255, 0.2);
    color: var(--text-secondary);
    animation: fadeIn 1s ease-out 1s both;
}

@keyframes slideInDown {
    from {
        opacity: 0;
        transform: translateY(-50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-10px); }
    60% { transform: translateY(-5px); }
}

@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    .title {
        font-size: 2rem;
    }
    
    .logo-container {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .calculator-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .calculator-card {
        padding: 1.5rem;
    }
}