:root {
    --everrank-blue: #1a2c4c;
    --everrank-orange: #f07f3c;
    --everrank-light-blue: #2a4a6c;
    --everrank-dark: #0f1a2c;
    --bg-light: #f8fafc;
    --bg-card: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border-color: #e2e8f0;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    --radius: 12px;
    --radius-sm: 8px;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, var(--everrank-dark) 0%, var(--everrank-blue) 50%, var(--everrank-light-blue) 100%);
    min-height: 100vh;
    color: var(--text-primary);
    line-height: 1.6;
}

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

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 30px;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: var(--radius);
    margin-bottom: 24px;
    box-shadow: var(--shadow-lg);
}

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

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--everrank-blue);
}

.logo-subtitle {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.fee-version {
    font-size: 0.85rem;
    color: var(--text-secondary);
    background: var(--bg-light);
    padding: 8px 16px;
    border-radius: var(--radius-sm);
}

/* Calculator Layout */
.calculator {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

@media (max-width: 900px) {
    .calculator {
        grid-template-columns: 1fr;
    }
}

/* Sections */
.input-section,
.results-section {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: var(--radius);
    padding: 30px;
    box-shadow: var(--shadow-lg);
}

.input-section h2,
.results-section h2 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--everrank-blue);
    margin-bottom: 24px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--border-color);
}

/* Input Groups */
.input-group {
    margin-bottom: 20px;
}

.input-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.input-group input,
.input-group select {
    width: 100%;
    padding: 14px 16px;
    font-size: 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    transition: all 0.2s ease;
    background: var(--bg-light);
}

.input-group input:focus,
.input-group select:focus {
    outline: none;
    border-color: var(--everrank-orange);
    box-shadow: 0 0 0 3px rgba(240, 127, 60, 0.1);
}

.input-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

/* FBA Section */
.fba-section {
    background: var(--bg-light);
    border-radius: var(--radius-sm);
    padding: 20px;
    margin-top: 16px;
    border: 2px solid var(--border-color);
    transition: opacity 0.3s ease;
}

.fba-section.disabled {
    opacity: 0.5;
    pointer-events: none;
}

.fba-section h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--everrank-blue);
    margin-bottom: 16px;
}

.dimensions-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
}

@media (max-width: 600px) {
    .dimensions-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.dimensions-grid .input-group {
    margin-bottom: 0;
}

.dimensions-grid input {
    padding: 12px;
    font-size: 0.9rem;
}

.size-tier-info {
    margin-top: 12px;
    padding: 12px 16px;
    background: white;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    color: var(--text-secondary);
    border-left: 4px solid var(--everrank-orange);
}

.size-tier-info.success {
    border-left-color: var(--success);
    background: rgba(16, 185, 129, 0.1);
}

/* Toggle Switch */
.toggle-container {
    display: flex;
    align-items: center;
    gap: 12px;
}

.toggle {
    position: relative;
    display: inline-block;
    width: 56px;
    height: 30px;
}

.toggle input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--border-color);
    transition: 0.3s;
    border-radius: 30px;
}

.toggle-slider:before {
    position: absolute;
    content: "";
    height: 24px;
    width: 24px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: 0.3s;
    border-radius: 50%;
    box-shadow: var(--shadow-sm);
}

.toggle input:checked + .toggle-slider {
    background-color: var(--everrank-orange);
}

.toggle input:checked + .toggle-slider:before {
    transform: translateX(26px);
}

.toggle-label {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-primary);
}

/* Result Cards */
.result-card {
    background: var(--bg-light);
    border-radius: var(--radius-sm);
    padding: 20px;
    margin-bottom: 16px;
    border: 2px solid var(--border-color);
}

.result-card.primary {
    background: linear-gradient(135deg, var(--everrank-blue) 0%, var(--everrank-light-blue) 100%);
    border: none;
    color: white;
}

.result-card.primary .result-label {
    color: rgba(255, 255, 255, 0.8);
}

.result-card.primary .result-value {
    color: white;
}

.result-card.primary .subtotal {
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    margin-top: 12px;
    padding-top: 12px;
}

.result-card.contribution {
    background: linear-gradient(135deg, var(--everrank-orange) 0%, #e06928 100%);
    border: none;
    color: white;
}

.result-card.contribution .result-label {
    color: rgba(255, 255, 255, 0.9);
}

.result-card.contribution .result-value {
    color: white;
}

.result-card.profit {
    background: var(--bg-light);
}

.result-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 0;
}

.result-row.deduction {
    opacity: 0.9;
}

.result-row.total {
    font-size: 1.2rem;
    font-weight: 700;
}

.result-row.margin {
    font-size: 0.9rem;
    opacity: 0.8;
}

.result-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.result-value {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.result-value.negative {
    color: var(--danger);
}

.result-card.primary .result-value.negative {
    color: rgba(255, 255, 255, 0.7);
}

.profit-row .result-value {
    font-size: 1.3rem;
}

.profit-row .result-value.positive {
    color: var(--success);
}

.profit-row .result-value.negative {
    color: var(--danger);
}

/* Disabled FBA rows */
#fbaFeeRow.disabled,
#storageRow.disabled {
    opacity: 0.4;
    text-decoration: line-through;
}

/* Breakdown */
.breakdown {
    margin-top: 16px;
}

.breakdown summary {
    cursor: pointer;
    padding: 12px 16px;
    background: var(--bg-light);
    border-radius: var(--radius-sm);
    font-weight: 500;
    color: var(--text-secondary);
    transition: all 0.2s;
}

.breakdown summary:hover {
    background: var(--border-color);
}

.breakdown-content {
    padding: 16px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.breakdown-content p {
    margin-bottom: 8px;
}

.breakdown-content strong {
    color: var(--text-primary);
}

/* Footer */
.footer {
    text-align: center;
    padding: 24px;
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.85rem;
    margin-top: 24px;
}

.footer a {
    color: var(--everrank-orange);
    text-decoration: none;
}

.footer a:hover {
    text-decoration: underline;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.result-card {
    animation: fadeIn 0.3s ease;
}

/* Responsive */
@media (max-width: 600px) {
    .header {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }
    
    .logo {
        flex-direction: column;
    }
    
    .input-row {
        grid-template-columns: 1fr;
    }
    
    .dimensions-grid {
        grid-template-columns: 1fr 1fr;
    }
}