:root {
    --primary-color: #E17055;
    --secondary-color: #FAB1A0;
    --bg-dark: #1e1e1e;
    --bg-card: #2d2d2d;
    --input-bg: #3d3d3d;
    --text-light: #f5f5f5;
    --text-dim: #a0a0a0;
    --danger: #ff4d4d;
    --success: #00b894;

    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;

    --radius: 8px;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-light);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-md);
}

header {
    background-color: var(--bg-card);
    box-shadow: var(--shadow);
    padding: var(--spacing-md) 0;
    margin-bottom: var(--spacing-lg);
}

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

h1 {
    color: var(--primary-color);
    font-size: 1.5rem;
}

h2 {
    color: var(--secondary-color);
    margin-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--primary-color);
    display: inline-block;
    padding-bottom: 4px;
}

h3 {
    color: var(--text-dim);
    margin-bottom: var(--spacing-sm);
}

.nav-btn {
    background: none;
    border: none;
    color: var(--text-dim);
    cursor: pointer;
    font-size: 1rem;
    margin-left: var(--spacing-md);
    padding: 8px 12px;
    transition: color 0.3s, background-color 0.3s;
    border-radius: var(--radius);
}

.nav-btn:hover, .nav-btn.active {
    color: var(--text-light);
    background-color: rgba(225, 112, 85, 0.2);
}

.card {
    background-color: var(--bg-card);
    border-radius: var(--radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow);
    margin-bottom: var(--spacing-lg);
}

.hidden {
    display: none;
}

.active {
    display: block;
}

/* Calculator Grid */
.calculator-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

.form-group {
    display: flex;
    flex-direction: column;
    margin-bottom: var(--spacing-md);
}

.form-group.full-width {
    grid-column: 1 / -1;
}

label {
    margin-bottom: var(--spacing-sm);
    color: var(--text-dim);
    font-size: 0.9rem;
}

.input-field {
    background-color: var(--input-bg);
    border: 1px solid transparent;
    border-radius: var(--radius);
    color: var(--text-light);
    padding: 10px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.input-field:focus {
    outline: none;
    border-color: var(--primary-color);
}

.input-field:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

textarea.input-field {
    resize: vertical;
    min-height: 100px;
}

.token-count-display {
    text-align: right;
    font-size: 0.8rem;
    color: var(--text-dim);
    margin-top: 4px;
}

/* Result Card */
.result-card {
    text-align: center;
    border: 1px solid var(--primary-color);
    background: linear-gradient(135deg, var(--bg-card) 0%, rgba(225, 112, 85, 0.1) 100%);
}

.cost-display {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--primary-color);
    margin: var(--spacing-md) 0;
}

.cost-breakdown {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    color: var(--text-dim);
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 12px 24px;
    font-size: 1rem;
    border-radius: var(--radius);
    cursor: pointer;
    transition: background-color 0.3s, transform 0.1s;
}

.btn-primary:hover {
    background-color: #d66045;
}

.btn-primary:active {
    transform: scale(0.98);
}

.form-actions {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

/* Projects Grid */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.project-card {
    background-color: var(--bg-card);
    border-radius: var(--radius);
    padding: var(--spacing-md);
    box-shadow: var(--shadow);
    transition: transform 0.2s;
    border-top: 4px solid var(--secondary-color);
    position: relative;
}

.project-card:hover {
    transform: translateY(-2px);
}

.project-card h3 {
    color: var(--text-light);
    margin-bottom: var(--spacing-sm);
}

.project-details {
    color: var(--text-dim);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-md);
}

.project-cost {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--primary-color);
}

.project-budget {
    font-size: 0.9rem;
    color: var(--text-dim);
}

.budget-alert {
    color: var(--danger);
    font-weight: bold;
    margin-top: var(--spacing-sm);
    display: none;
}

.project-card.over-budget {
    border-color: var(--danger);
}

.project-card.over-budget .budget-alert {
    display: block;
}

.delete-btn {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    background: none;
    border: none;
    color: var(--text-dim);
    cursor: pointer;
    font-size: 1.2rem;
    opacity: 0.6;
    transition: opacity 0.2s;
}

.delete-btn:hover {
    opacity: 1;
    color: var(--danger);
}

/* Pricing Table */
.pricing-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: var(--spacing-md);
}

.pricing-table th, .pricing-table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid var(--input-bg);
}

.pricing-table th {
    color: var(--primary-color);
    font-weight: bold;
    text-transform: uppercase;
    font-size: 0.8rem;
}

.pricing-table tr:hover {
    background-color: rgba(225, 112, 85, 0.05);
}

.provider-badge {
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.8rem;
    color: white;
    background-color: var(--input-bg);
}

.provider-badge.openai { background-color: #10a37f; }
.provider-badge.anthropic { background-color: #d97757; }
.provider-badge.google { background-color: #4285f4; }

footer {
    text-align: center;
    padding: var(--spacing-lg);
    color: var(--text-dim);
    font-size: 0.9rem;
    border-top: 1px solid var(--bg-card);
    margin-top: var(--spacing-lg);
}

/* Responsive */
@media (max-width: 768px) {
    .calculator-grid {
        grid-template-columns: 1fr;
    }
    .pricing-table {
        font-size: 0.9rem;
    }
}