/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-bg: #0a0a0a;
    --secondary-bg: #1a1a1a;
    --panel-bg: #111111;
    --border-color: #333333;
    --text-primary: #ffffff;
    --text-secondary: #cccccc;
    --text-muted: #888888;
    --accent-gold: #ffa500;
    --success-green: #00ff88;
    --error-red: #ff4444;
    --hover-bg: #252525;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--primary-bg);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* Header */
.main-header {
    background-color: var(--secondary-bg);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: 16px;
}

.logo {
    font-size: 24px;
    color: var(--accent-gold);
}

.site-title h1 {
    font-size: 20px;
    font-weight: 600;
    margin: 0;
    color: var(--text-primary);
}

.tagline {
    font-size: 12px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.nav-links {
    display: flex;
    gap: 32px;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 16px;
    font-weight: 600;
    transition: color 0.2s ease;
}

.nav-links a:hover {
    color: var(--text-primary);
}

/* Main content */
.main-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Hero section */
.hero-section {
    padding: 80px 0;
    text-align: center;
}

.hero-title {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--text-primary);
}

.hero-description {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 48px;
    line-height: 1.7;
}

/* Calculator card */
.calculator-card {
    background-color: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 40px;
    max-width: 480px;
    margin: 0 auto;
}

.input-row {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 32px;
    justify-content: center;
}

.input-label {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.age-input {
    width: 80px;
    height: 48px;
    background-color: var(--secondary-bg);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-primary);
    font-size: 18px;
    font-weight: 600;
    text-align: center;
    font-family: 'JetBrains Mono', monospace;
    transition: all 0.2s ease;
}

.age-input:focus {
    outline: none;
    border-color: var(--text-primary);
    box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.1);
}

.age-input::placeholder {
    color: var(--text-muted);
}

.unit {
    font-size: 14px;
    color: var(--text-muted);
}

.calculate-btn {
    background-color: var(--text-primary);
    border: none;
    border-radius: 4px;
    color: var(--primary-bg);
    padding: 12px 24px;
    font-size: 14px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 8px;
    justify-content: center;
    min-width: 160px;
    margin: 0 auto;
}

.calculate-btn:hover:not(:disabled) {
    background-color: var(--text-secondary);
    transform: translateY(-1px);
}

.calculate-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.btn-icon {
    font-size: 16px;
    transition: transform 0.2s ease;
}

.calculate-btn:hover:not(:disabled) .btn-icon {
    transform: translateX(2px);
}

/* Loading state */
.loading-state {
    display: none;
    text-align: center;
    margin-top: 24px;
}

.loading-animation {
    display: flex;
    gap: 4px;
    justify-content: center;
    margin-bottom: 16px;
}

.loading-dot {
    width: 8px;
    height: 8px;
    background-color: var(--text-primary);
    border-radius: 50%;
    animation: loading-pulse 1.4s ease-in-out infinite both;
}

.loading-dot:nth-child(1) { animation-delay: -0.32s; }
.loading-dot:nth-child(2) { animation-delay: -0.16s; }

@keyframes loading-pulse {
    0%, 80%, 100% {
        opacity: 0.3;
        transform: scale(1);
    }
    40% {
        opacity: 1;
        transform: scale(1.2);
    }
}

.loading-text {
    font-size: 14px;
    color: var(--text-muted);
}

/* Results section */
.results-section {
    display: none;
    padding: 48px 0;
}

.results-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-bottom: 24px;
}

.star-data-panel,
.star-image-panel {
    background-color: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 24px;
}

.panel-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--accent-gold);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 8px;
}

.data-rows {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.data-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.data-label {
    font-size: 13px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.data-value {
    font-family: 'JetBrains Mono', monospace;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
}

.image-container {
    text-align: center;
}

.image-container img {
    max-width: 100%;
    height: auto;
    border-radius: 4px;
    border: 1px solid var(--border-color);
    margin-bottom: 12px;
}

.image-metadata {
    font-size: 11px;
    color: var(--text-muted);
}

.message-panel {
    background-color: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 24px;
}

.message-content {
    font-size: 16px;
    line-height: 1.7;
    color: var(--text-secondary);
}

/* About section */
.about-section {
    padding: 80px 0;
    border-top: 1px solid var(--border-color);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 500px;
    gap: 60px;
    align-items: start;
}

.section-title {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--text-primary);
}

.about-description {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 32px;
}

.technical-note {
    background-color: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 24px;
    margin-top: 40px;
    width: 100%;
}

.note-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 12px;
}

.note-text {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.exhibit-frame {
    background-color: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
    height: fit-content;
}

.exhibit-frame img {
    width: 100%;
    height: auto;
    border-radius: 4px;
    margin-bottom: 16px;
    max-height: 700px;
    object-fit: cover;
}

.exhibit-caption {
    font-size: 12px;
    color: var(--text-muted);
    text-align: center;
    line-height: 1.4;
}

/* Footer */
.main-footer {
    background-color: var(--secondary-bg);
    border-top: 1px solid var(--border-color);
    padding: 24px 0;
    margin-top: 80px;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    text-align: center;
}

.footer-content p {
    font-size: 14px;
    color: var(--text-muted);
}

/* Error states */
.error-message {
    background-color: rgba(255, 68, 68, 0.1);
    border: 1px solid var(--error-red);
    border-radius: 4px;
    padding: 16px;
    margin-top: 16px;
    color: var(--error-red);
    font-size: 14px;
}

/* Responsive design */
@media (max-width: 768px) {
    .header-content {
        padding: 0 16px;
    }
    
    .main-content {
        padding: 0 16px;
    }
    
    .hero-title {
        font-size: 36px;
    }
    
    .hero-description {
        font-size: 16px;
    }
    
    .calculator-card {
        padding: 24px;
    }
    
    .results-grid {
        grid-template-columns: 1fr;
    }
    
    .about-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    
    .section-title {
        font-size: 24px;
    }
    
    .nav-links {
        gap: 16px;
    }
    
    .input-row {
        flex-direction: column;
        gap: 8px;
    }
}

@media (max-width: 480px) {
    .hero-section {
        padding: 40px 0;
    }
    
    .about-section {
        padding: 40px 0;
    }
    
    .hero-title {
        font-size: 28px;
    }
    
    .calculator-card {
        padding: 20px;
    }
    
    .about-grid {
        grid-template-columns: 1fr;
    }
    
    .exhibit-frame {
        padding: 16px;
    }
}