:root {
    --primary: #000000;
    --accent: #2563eb;
    --bg: #fafafa;
    --white: #ffffff;
    --text-main: #111111;
    --text-muted: #666666;
    --border: #eeeeee;
    --radius-lg: 16px;
    --radius-md: 12px;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
}

body {
    background-color: var(--bg);
    font-family: 'Plus Jakarta Sans', -apple-system, blinkmacsystemfont, 'Segoe UI', roboto, sans-serif;
    color: var(--text-main);
    margin: 0;
    -webkit-font-smoothing: antialiased;
    animation: fadeIn 0.5s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.checkout-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 40px 20px;
}

/* Header */
.checkout-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
}

.back-link {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    color: var(--text-muted);
    font-size: 14px;
    font-weight: 500;
    transition: color 0.2s;
}

.back-link:hover {
    color: var(--primary);
}

/* Main Grid */
.checkout-grid {
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: 40px;
    align-items: start;
}

@media (max-width: 992px) {
    .checkout-grid {
        grid-template-columns: 1fr;
    }
}

/* Card Styles */
.card {
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    overflow: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.08);
}

.card-body {
    padding: 32px;
}

.section-title {
    font-size: 20px;
    font-weight: 700;
    margin: 0 0 24px;
    letter-spacing: -0.02em;
}

/* Product Protagonist */
.product-hero {
    display: flex;
    gap: 24px;
    margin-bottom: 32px;
    padding-bottom: 32px;
    border-bottom: 1px solid var(--border);
}

.product-image {
    width: 120px;
    height: 120px;
    border-radius: var(--radius-md);
    object-fit: cover;
    background: #f5f5f5;
}

.product-info {
    flex: 1;
}

.product-tag {
    display: inline-block;
    padding: 4px 12px;
    background: #f0f4ff;
    color: var(--accent);
    border-radius: 100px;
    font-size: 12px;
    font-weight: 600;
    margin-bottom: 8px;
}

.product-title {
    font-size: 24px;
    font-weight: 700;
    margin: 0 0 8px;
    line-height: 1.2;
}

.product-price {
    font-size: 20px;
    font-weight: 700;
    color: var(--accent);
}

/* Form Styles */
.form-grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: 24px;
    /* Increased gap from 16px to 24px */
}

.form-group {
    grid-column: span 12;
    /* Default to full width for mobile safety */
    margin-bottom: 8px;
    /* Added slight margin bottom */
}

/* Specific overrides for desktop grid */
.form-group.half {
    grid-column: span 6;
}

.form-group.full {
    grid-column: span 12;
}

.form-group.span-8 {
    grid-column: span 8;
}

.form-group.span-4 {
    grid-column: span 4;
}

.form-group.span-3 {
    grid-column: span 3;
}

.form-group.span-2 {
    grid-column: span 3;
    /* Increased from 2 to 3 for better usability */
}

/* City field adjustment */
.form-group.span-6 {
    grid-column: span 5;
}

/* Country field adjustment */
.form-group.span-country {
    grid-column: span 4;
}

.form-label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-main);
}

.form-input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    font-size: 15px;
    transition: all 0.2s;
    background: #ffffff;
}

.form-input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-input.is-invalid {
    border-color: #ef4444;
}

/* Autocomplete Styles */
.form-group.full {
    position: relative;
}

.autocomplete-suggestions {
    border: 1px solid #e2e8f0;
    background: #fff;
    cursor: pointer;
    overflow: auto;
    max-height: 200px;
    position: absolute;
    width: 100%;
    z-index: 1000;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    top: 100%;
    margin-top: 4px;
    display: none;
    /* Hidden by default */
}

.autocomplete-suggestion {
    padding: 12px 16px;
    font-size: 14px;
    color: var(--text-main);
    transition: background 0.15s;
    border-bottom: 1px solid #f8fafc;
}

.autocomplete-suggestion:last-child {
    border-bottom: none;
}

.autocomplete-suggestion:hover {
    background: #f1f5f9;
}

.autocomplete-suggestion strong {
    font-weight: 600;
    color: var(--primary);
}

/* Summary Sidebar */
.summary-card {
    position: sticky;
    top: 40px;
}

.summary-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 12px;
    color: var(--text-muted);
    font-size: 15px;
}

/* Shipping Row - Hidden by default */
.summary-row.shipping-row {
    display: none;
}

.summary-row.total {
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid var(--border);
    color: var(--text-main);
    font-size: 24px;
    font-weight: 800;
}

.btn-submit {
    width: 100%;
    padding: 18px;
    background: var(--primary);
    color: var(--white);
    border: none;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s;
    margin-top: 24px;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
}

.btn-submit:hover {
    background: #222;
    transform: translateY(-1px);
}

.btn-submit:disabled {
    background: #ccc;
    cursor: not-allowed;
    transform: none;
}

/* Security Badges */
.security-footer {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    margin-top: 32px;
    padding: 24px;
    background: #f8fafc;
    border-radius: 12px;
}

.security-text {
    font-size: 13px;
    color: var(--text-muted);
    text-align: center;
    display: flex;
    align-items: center;
    gap: 6px;
}

.payment-icons {
    display: flex;
    gap: 12px;
    opacity: 0.7;
}

.payment-icons img {
    height: 24px;
}

/* Checkbox */
.terms-label {
    display: flex;
    gap: 12px;
    font-size: 13px;
    color: var(--text-muted);
    cursor: pointer;
    align-items: flex-start;
    margin-top: 16px;
}

.terms-label input {
    margin-top: 2px;
}

.terms-label a {
    color: var(--primary);
    text-decoration: underline;
}

/* Mobile Adjustments */
@media (max-width: 640px) {
    .form-grid {
        grid-template-columns: 1fr;
    }

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

/* Product Unavailable Fallback */
.product-unavailable {
    text-align: center;
    padding: 60px 24px;
}

.product-unavailable i {
    font-size: 48px;
    color: #cbd5e0;
    margin-bottom: 20px;
    display: block;
}

.product-unavailable h2 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-main);
}

.product-unavailable p {
    color: var(--text-muted);
    font-size: 15px;
    margin-bottom: 24px;
    max-width: 300px;
    margin-left: auto;
    margin-right: auto;
}

.btn-back {
    display: inline-block;
    padding: 12px 24px;
    background: var(--primary);
    color: white !important;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 14px;
    transition: all 0.2s;
}

.btn-back:hover {
    background: #222;
    transform: translateY(-1px);
}