:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --accent-color: #ec4899;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --bg-dark: #0f172a;
    --bg-card: rgba(30, 41, 59, 0.8);
    --bg-input: rgba(51, 65, 85, 0.6);
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --border-color: rgba(148, 163, 184, 0.2);
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.4);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
    padding: 2rem 1rem;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
}

/* Header Styles */
.header {
    text-align: center;
    margin-bottom: 3rem;
    animation: fadeInDown 0.6s ease-out;
}

.header h1 {
    font-size: 3rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--accent-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
}

.subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    font-weight: 300;
}

/* Card Styles */
.card {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-xl);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    animation: fadeInUp 0.6s ease-out;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 25px 35px -5px rgba(0, 0, 0, 0.5);
}

.card h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--primary-light);
}

/* Form Styles */
.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.required {
    color: var(--accent-color);
}

.form-group input {
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    color: var(--text-primary);
    font-family: inherit;
    transition: all 0.3s ease;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
    background: rgba(51, 65, 85, 0.8);
}

.form-group input:hover {
    border-color: var(--primary-light);
}

.form-group select {
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    color: var(--text-primary);
    font-family: inherit;
    transition: all 0.3s ease;
    cursor: pointer;
}

.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
    background: rgba(51, 65, 85, 0.8);
}

.form-group select:hover {
    border-color: var(--primary-light);
}

.form-group select option {
    background: var(--bg-dark);
    color: var(--text-primary);
}

/* Button Styles */
.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    border: none;
    border-radius: 0.5rem;
    padding: 1rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-md);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    width: 100%;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary-color) 100%);
}

.btn-primary:active {
    transform: translateY(0);
}

/* Results Section */
.results-section {
    animation: fadeInUp 0.6s ease-out;
}

.hidden {
    display: none;
}

/* Table Styles */
.table-wrapper {
    overflow-x: auto;
    border-radius: 0.5rem;
    margin-top: 1rem;
}

.options-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}

.options-table thead {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.2) 0%, rgba(236, 72, 153, 0.2) 100%);
    position: sticky;
    top: 0;
    z-index: 10;
}

.options-table th {
    padding: 1rem 0.75rem;
    text-align: right;
    font-weight: 600;
    color: var(--text-primary);
    border-bottom: 2px solid var(--border-color);
    white-space: nowrap;
}

.options-table th:first-child {
    text-align: left;
    position: sticky;
    left: 0;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.2) 0%, rgba(236, 72, 153, 0.2) 100%);
    z-index: 11;
}

.options-table tbody tr {
    transition: background-color 0.2s ease;
}

.options-table tbody tr:nth-child(even) {
    background: rgba(51, 65, 85, 0.3);
}

.options-table tbody tr:hover {
    background: rgba(99, 102, 241, 0.15);
}

.options-table td {
    padding: 0.75rem;
    text-align: right;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-secondary);
}

.options-table td:first-child {
    text-align: left;
    font-weight: 600;
    color: var(--text-primary);
    position: sticky;
    left: 0;
    background: inherit;
    z-index: 1;
}

.options-table tbody tr:nth-child(even) td:first-child {
    background: rgba(51, 65, 85, 0.3);
}

.options-table tbody tr:hover td:first-child {
    background: rgba(99, 102, 241, 0.15);
}

/* Price cell coloring */
.price-high {
    color: var(--success-color);
    font-weight: 500;
}

.price-medium {
    color: var(--warning-color);
    font-weight: 500;
}

.price-low {
    color: var(--text-muted);
}

/* Animations */
@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    body {
        padding: 1rem 0.5rem;
    }

    .header h1 {
        font-size: 2rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    .card {
        padding: 1.5rem;
    }

    .form-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .options-table {
        font-size: 0.75rem;
    }

    .options-table th,
    .options-table td {
        padding: 0.5rem 0.375rem;
    }
}

@media (max-width: 480px) {
    .header h1 {
        font-size: 1.5rem;
    }

    .card {
        padding: 1rem;
        border-radius: 0.75rem;
    }

    .btn-primary {
        padding: 0.875rem 1.5rem;
    }
}