:root {
    --bg-primary: #0a0f1a;
    --bg-secondary: #131b2e;
    --bg-card: #1a2236;
    --accent-primary: #00d4aa;
    --accent-secondary: #579950;
    --text-primary: #e8edf5;
    --text-secondary: #8892a4;
    --border-color: #2a3554;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Pretendard', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Hero Section */
.hero {
    padding: 80px 0;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(0, 212, 170, 0.1) 0%, transparent 70%);
    animation: float 20s infinite ease-in-out;
}

.hero-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 60px;
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: glow 3s infinite alternate;
}

.hero p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 500px;
    margin-bottom: 30px;
}

.hero-image {
    width: 500px;
    height: 300px;
    object-fit: cover;
    border-radius: 20px;
    box-shadow: var(--shadow);
    animation: slideIn 1s ease-out;
}

/* Calculator Section */
.calculator {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
}

.calculator-card {
    background: var(--bg-card);
    border-radius: 20px;
    padding: 40px;
    box-shadow: var(--shadow);
    max-width: 600px;
    margin: 0 auto;
    animation: fadeInUp 1s ease-out;
}

.calculator h2 {
    font-size: 2.5rem;
    margin-bottom: 30px;
    text-align: center;
    color: var(--accent-primary);
}

.input-group {
    margin-bottom: 25px;
}

.input-group label {
    display: block;
    margin-bottom: 10px;
    font-weight: 500;
    color: var(--text-primary);
}

.input-group input,
.input-group select {
    width: 100%;
    padding: 15px;
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: 10px;
    color: var(--text-primary);
    font-size: 1rem;
    transition: var(--transition);
}

.input-group input:focus,
.input-group select:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(0, 212, 170, 0.2);
}

.calculate-btn {
    width: 100%;
    padding: 18px;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    border: none;
    border-radius: 10px;
    color: var(--bg-primary);
    font-size: 1.2rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    margin-top: 10px;
}

.calculate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(0, 212, 170, 0.3);
}

/* Results Section */
.results {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

.results-card {
    background: var(--bg-card);
    border-radius: 20px;
    padding: 40px;
    box-shadow: var(--shadow);
    max-width: 800px;
    margin: 0 auto;
    animation: fadeInUp 1s ease-out;
}

.result-summary {
    display: flex;
    justify-content: space-around;
    margin-bottom: 40px;
}

.result-item {
    text-align: center;
}

.result-item span:first-child {
    display: block;
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 10px;
}

.price {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent-primary);
}

.chart-container {
    height: 300px;
    margin-bottom: 40px;
}

.cost-breakdown {
    margin-bottom: 40px;
}

.cost-breakdown h3 {
    font-size: 1.8rem;
    margin-bottom: 20px;
    color: var(--accent-primary);
}

#breakdown {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.breakdown-item {
    display: flex;
    justify-content: space-between;
    padding: 15px;
    background: var(--bg-secondary);
    border-radius: 10px;
    border: 1px solid var(--border-color);
}

.breakdown-name {
    font-weight: 500;
    color: var(--text-primary);
}

.breakdown-value {
    font-weight: 600;
    color: var(--accent-primary);
}

.optimization-tips {
    background: var(--bg-primary);
    border-radius: 15px;
    padding: 25px;
    border: 1px solid var(--border-color);
}

.optimization-tips h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: var(--accent-secondary);
}

.optimization-tips ul {
    list-style: none;
}

.optimization-tips li {
    padding: 10px 0;
    padding-left: 25px;
    position: relative;
    color: var(--text-secondary);
}

.optimization-tips li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--accent-primary);
    font-weight: bold;
}

/* Features Section */
.features {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    max-width: 1200px;
    margin: 0 auto;
}

.feature-card {
    background: var(--bg-card);
    border-radius: 20px;
    padding: 30px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.feature-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 15px;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: var(--accent-primary);
}

.feature-card p {
    color: var(--text-secondary);
}

/* CTA Section */
.cta {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    text-align: center;
}

.cta-content {
    max-width: 800px;
    margin: 0 auto;
}

.cta h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    color: var(--accent-primary);
}

.cta p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 30px;
}

.cta-button {
    display: inline-block;
    padding: 18px 40px;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: var(--bg-primary);
    text-decoration: none;
    border-radius: 50px;
    font-size: 1.2rem;
    font-weight: 600;
    transition: var(--transition);
    box-shadow: 0 10px 20px rgba(0, 212, 170, 0.3);
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 30px rgba(0, 212, 170, 0.4);
}

/* Animations */
@keyframes float {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    50% { transform: translate(-20px, -20px) rotate(5deg); }
}

@keyframes glow {
    0% { filter: brightness(1); }
    100% { filter: brightness(1.1); }
}

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

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-content {
        flex-direction: column;
        text-align: center;
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .hero-image {
        width: 100%;
        max-width: 400px;
        margin-top: 30px;
    }
    
    .result-summary {
        flex-direction: column;
        gap: 20px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
}

/* Loading Animation */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: var(--accent-primary);
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}