* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
    background-color: #f4f6f8;
    color: #333;
    line-height: 1.5;
    padding: 20px;
}

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

header {
    margin-bottom: 24px;
    text-align: center;
}

header h1 {
    font-size: 1.8rem;
    color: #1a1a1a;
    margin-bottom: 6px;
}

header p {
    color: #666;
    font-size: 0.95rem;
}

.grid-main {
    display: grid;
    grid-template-columns: 380px 1fr;
    gap: 20px;
}

@media (max-width: 850px) {
    .grid-main {
        grid-template-columns: 1fr;
    }
}

.card {
    background: #ffffff;
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    border: 1px solid #e1e4e8;
    margin-bottom: 20px;
}

.card h2 {
    font-size: 1.1rem;
    color: #2c3e50;
    margin-bottom: 16px;
}

.input-group {
    margin-bottom: 16px;
}

.input-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: #4a5568;
    margin-bottom: 6px;
}

.input-group small {
    display: block;
    font-size: 0.75rem;
    color: #718096;
    margin-top: 4px;
}

input[type="number"] {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid #cbd5e0;
    border-radius: 6px;
    font-size: 0.95rem;
}

input[type="number"]:focus {
    outline: none;
    border-color: #3182ce;
}

.input-with-symbol {
    position: relative;
    display: flex;
    align-items: center;
}

.input-with-symbol input {
    width: 100%;
}

.input-with-symbol .symbol {
    position: absolute;
    right: 12px;
    color: #a0aec0;
    font-weight: bold;
}

.input-with-symbol .symbol-prefix {
    position: absolute;
    left: 12px;
    color: #a0aec0;
    font-weight: bold;
}

.input-with-symbol input:has(+ .symbol) {
    padding-right: 30px;
}

.input-with-symbol input:has(.symbol-prefix) {
    padding-left: 35px;
}

.preset-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 6px;
    margin-bottom: 8px;
}

.btn-preset {
    padding: 6px 8px;
    font-size: 0.75rem;
    background: #edf2f7;
    border: 1px solid #cbd5e0;
    border-radius: 4px;
    cursor: pointer;
}

.btn-preset.active {
    background: #3182ce;
    color: white;
    border-color: #2b6cb0;
}

.divider {
    border: 0;
    height: 1px;
    background: #e2e8f0;
    margin: 20px 0;
}

.results-container {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
}

.platform-badge {
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: bold;
    text-transform: uppercase;
}

.platform-badge.shopee { background: #ffeae6; color: #ee4d2d; }
.platform-badge.ml { background: #fff9db; color: #2d3277; }
.platform-badge.own { background: #ebf8ff; color: #2b6cb0; }

.price-display {
    display: flex;
    align-items: baseline;
    margin-bottom: 16px;
}

.price-display .currency {
    font-size: 1.5rem;
    font-weight: 600;
    margin-right: 4px;
    color: #2d3748;
}

.price-display .price-value {
    font-size: 2.4rem;
    font-weight: 800;
    color: #1a202c;
}

.shopee-alert {
    background: #fffaf0;
    border-left: 4px solid #dd6b20;
    padding: 10px 12px;
    border-radius: 4px;
    margin-bottom: 16px;
    font-size: 0.82rem;
    color: #7b341e;
}

.shopee-alert.hidden { display: none; }

.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
    gap: 12px;
    background: #f7fafc;
    padding: 12px;
    border-radius: 8px;
}

.metric {
    display: flex;
    flex-direction: column;
}

.metric .label {
    font-size: 0.72rem;
    color: #718096;
    text-transform: uppercase;
}

.metric .value {
    font-size: 0.95rem;
    font-weight: 600;
    color: #2d3748;
}

.metric .value.highlight { color: #38a169; }

footer {
    text-align: center;
    margin-top: 30px;
    color: #a0aec0;
    font-size: 0.8rem;
}