:root {
    --primary: #1a237e;
    --primary-light: #534bae;
    --accent: #00bcd4;
    --bg: #f5f5f5;
    --card-bg: #ffffff;
    --text: #212121;
    --text-secondary: #757575;
    --error: #f44336;
    --success: #4caf50;
    --border: #e0e0e0;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
}

header {
    text-align: center;
    margin-bottom: 32px;
}

header h1 {
    font-size: 2.5rem;
    color: var(--primary);
    margin-bottom: 8px;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.input-section {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 24px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    margin-bottom: 24px;
}

.input-section label {
    display: block;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text);
}

.input-row {
    display: flex;
    gap: 12px;
}

#vin-input {
    flex: 1;
    padding: 14px 16px;
    font-size: 1.2rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    border: 2px solid var(--border);
    border-radius: 8px;
    transition: border-color 0.2s;
    font-family: 'Courier New', monospace;
}

#vin-input:focus {
    outline: none;
    border-color: var(--primary);
}

#decode-btn {
    padding: 14px 32px;
    font-size: 1rem;
    font-weight: 600;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
    white-space: nowrap;
}

#decode-btn:hover {
    background: var(--primary-light);
}

#decode-btn:active {
    transform: scale(0.97);
}

.error-msg {
    color: var(--error);
    font-size: 0.9rem;
    margin-top: 8px;
    min-height: 1.2em;
}

.loading {
    text-align: center;
    padding: 40px;
}

.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto 16px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.results {
    margin-top: 24px;
}

.results h2 {
    color: var(--primary);
    margin-bottom: 16px;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 16px;
}

.info-card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 16px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
    border-left: 4px solid var(--accent);
}

.info-card .label {
    font-size: 0.75rem;
    text-transform: uppercase;
    color: var(--text-secondary);
    letter-spacing: 0.5px;
    margin-bottom: 4px;
}

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

.info-card.highlight {
    border-left-color: var(--success);
    background: #f1f8e9;
}

.api-error {
    background: #ffebee;
    border-radius: 12px;
    padding: 24px;
    text-align: center;
    color: var(--error);
    margin-top: 24px;
}

.error-detail {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 8px;
}

footer {
    text-align: center;
    margin-top: 40px;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

footer a {
    color: var(--primary);
    text-decoration: none;
}

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

.hidden {
    display: none !important;
}

@media (max-width: 600px) {
    header h1 { font-size: 1.8rem; }
    .input-row { flex-direction: column; }
    #decode-btn { width: 100%; }
    .card-grid { grid-template-columns: 1fr; }
}