:root {
    --ck-primary: #4b2d15;
    --ck-bg: #f0ebe5;
    --ck-card-bg: #ffffff;
    --ck-border: #e5e7eb;
    --ck-text: #1f2937;
    --ck-text-light: #6b7280;
    --ck-text-muted: #9ca3af;
    --ck-radius-card: 16px;
    --ck-radius-input: 12px;
    --ck-radius-btn: 16px;
}

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

body {
    font-family: 'Open Sans', sans-serif;
    background-color: var(--ck-bg);
    color: var(--ck-text);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

.checkout-header {
    background-color: var(--ck-primary);
    text-align: center;
    padding: 1.5rem 1rem;
}

.checkout-logo {
    height: 50px;
    filter: brightness(0) invert(1);
}

.checkout-main {
    max-width: 440px;
    margin: 0 auto;
    padding: 1rem;
    padding-bottom: 3rem;
}

.checkout-card {
    background: var(--ck-card-bg);
    border-radius: var(--ck-radius-card);
    padding: 1.5rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
    margin-bottom: 1rem;
}

/* Product Summary */
.product-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.product-thumb {
    width: 64px;
    height: 64px;
    border-radius: 12px;
    border: 1px solid var(--ck-border);
    overflow: hidden;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #fff;
}

.product-thumb img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    padding: 4px;
}

.product-details {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.product-name {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--ck-text);
    line-height: 1.3;
}

.product-desc {
    font-size: 0.8rem;
    color: var(--ck-text-light);
    margin-top: 2px;
}

.product-qty {
    color: var(--ck-text-muted);
    font-size: 0.9rem;
    flex-shrink: 0;
}

.divider {
    height: 1px;
    background: var(--ck-border);
    margin: 1.25rem 0;
}

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

.total-label {
    color: var(--ck-text-light);
    font-size: 0.95rem;
}

.total-value {
    font-weight: 700;
    font-size: 1rem;
    color: var(--ck-text);
}

/* Steps */
.steps-container {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 2rem;
    margin-bottom: 1.5rem;
}

.steps-track {
    position: absolute;
    left: 2rem;
    right: 2rem;
    top: 50%;
    transform: translateY(-50%);
    height: 2px;
}

.steps-line-bg {
    position: absolute;
    inset: 0;
    background: #e2e8f0;
}

.steps-line-progress {
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    background: var(--ck-primary);
    width: 0%;
    transition: width 0.5s ease;
}

.step-circle {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #cbd5e1;
    color: #fff;
    position: relative;
    z-index: 1;
    transition: all 0.3s;
}

.step-circle.active,
.step-circle.completed {
    background: var(--ck-primary);
}

.step-circle svg {
    width: 18px;
    height: 18px;
}

/* Form */
.checkout-form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.form-group label {
    font-size: 0.9rem;
    color: var(--ck-text);
    font-weight: 400;
}

.form-group input {
    width: 100%;
    padding: 1rem 0.85rem;
    border: 1px solid var(--ck-border);
    border-radius: var(--ck-radius-input);
    font-size: 1rem;
    font-family: inherit;
    outline: none;
    background: #fff;
    color: var(--ck-text);
    transition: border-color 0.2s;
}

.form-group input:focus {
    border-color: var(--ck-primary);
}

.form-group input::placeholder {
    color: var(--ck-text-muted);
}

.form-group input[readonly] {
    background: #f3f4f6;
    color: var(--ck-text-light);
    cursor: default;
}

.form-group .field-error {
    color: #ef4444;
    font-size: 0.8rem;
    min-height: 0;
}

.optional-tag {
    font-size: 0.75rem;
    color: var(--ck-text-muted);
    font-weight: 400;
}

/* Form Separator */
.form-separator {
    height: 1px;
    background: var(--ck-border);
    margin: 0.25rem 0;
}

/* CEP Input */
.cep-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.cep-input-wrapper input {
    width: 100%;
    padding-right: 3rem;
}

.cep-spinner,
.cep-check {
    position: absolute;
    right: 0.85rem;
    display: flex;
    align-items: center;
}

.ck-spinner-sm {
    width: 20px;
    height: 20px;
    border: 3px solid #e5e7eb;
    border-top-color: var(--ck-primary);
    border-radius: 50%;
    animation: ck-spin 0.8s linear infinite;
}

.cep-check i {
    color: #10b981;
    font-size: 1.2rem;
}

/* Form Row (side by side) */
.form-row {
    display: flex;
    gap: 0.75rem;
}

.form-group-number {
    flex: 0 0 35%;
}

.form-group-complement {
    flex: 1;
}

.form-group-city {
    flex: 1;
}

.form-group-state {
    flex: 0 0 70px;
}

/* Address Fields Animation */
.address-fields {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    overflow: hidden;
    transition: opacity 0.3s ease, max-height 0.4s ease;
}

.address-fields.hidden {
    display: none !important;
}

.address-fields.showing {
    animation: slideDown 0.3s ease forwards;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Button */
.checkout-btn {
    width: 100%;
    padding: 1.15rem;
    background: var(--ck-primary);
    color: #fff;
    border: 2px solid var(--ck-primary);
    border-radius: var(--ck-radius-btn);
    font-size: 1rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.3s;
    margin-top: 0.5rem;
}

.checkout-btn:hover {
    background: transparent;
    color: var(--ck-primary);
}

.checkout-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.terms-text {
    text-align: center;
    font-size: 0.85rem;
    color: var(--ck-text-muted);
    margin-top: 0.25rem;
    line-height: 1.5;
}

/* Hidden */
.hidden {
    display: none !important;
}

/* PIX Section */
.pix-container {
    text-align: center;
}

.pix-container h3 {
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
    color: var(--ck-text);
    font-family: 'Open Sans', sans-serif;
}

.pix-loading {
    padding: 2rem 0;
}

.ck-spinner {
    width: 40px;
    height: 40px;
    border: 4px solid #e5e7eb;
    border-top-color: var(--ck-primary);
    border-radius: 50%;
    margin: 0 auto 1rem;
    animation: ck-spin 0.8s linear infinite;
}

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

.pix-loading p {
    color: var(--ck-text-light);
    font-size: 0.95rem;
}

.qr-code-container {
    margin: 0 auto 1.5rem;
    width: 200px;
    height: 200px;
    border: 1px solid var(--ck-border);
    border-radius: 12px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #fff;
}

.qr-code-container img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.pix-copy-container {
    text-align: left;
    margin-bottom: 1.5rem;
}

.pix-copy-container label {
    display: block;
    font-size: 0.9rem;
    color: var(--ck-text);
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.pix-code-wrapper {
    display: flex;
    gap: 0.5rem;
}

.pix-code-wrapper input {
    flex: 1;
    padding: 0.75rem;
    border: 1px solid var(--ck-border);
    border-radius: var(--ck-radius-input);
    font-size: 0.8rem;
    font-family: monospace;
    background: #f9fafb;
    color: var(--ck-text);
    outline: none;
    min-width: 0;
}

.copy-btn {
    padding: 0.75rem 1rem;
    background: var(--ck-primary);
    color: #fff;
    border: none;
    border-radius: var(--ck-radius-input);
    cursor: pointer;
    transition: opacity 0.2s;
    flex-shrink: 0;
}

.copy-btn:hover {
    opacity: 0.85;
}

.pix-timer {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    color: var(--ck-text-light);
    margin-bottom: 1rem;
}

.pix-timer i {
    color: var(--ck-primary);
}

.pix-status {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    color: #92400e;
    padding: 0.8rem;
    background: #fef3c7;
    border-radius: 8px;
}

.pulse-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #f59e0b;
    animation: pulseDot 2s infinite;
    flex-shrink: 0;
}

@keyframes pulseDot {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

/* Payment Success */
.pix-success {
    text-align: center;
    padding: 2rem 0;
}

.success-icon {
    font-size: 4rem;
    color: #10b981;
    margin-bottom: 1rem;
    animation: successPop 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes successPop {
    0% { transform: scale(0); opacity: 0; }
    100% { transform: scale(1); opacity: 1; }
}

.pix-success h3 {
    font-size: 1.3rem;
    color: var(--ck-text);
    margin-bottom: 0.5rem;
    font-family: 'Open Sans', sans-serif;
}

.pix-success p {
    color: var(--ck-text-light);
    font-size: 0.95rem;
    margin-bottom: 0.25rem;
}

.success-sub {
    font-size: 0.85rem !important;
    color: var(--ck-text-muted) !important;
}

/* Payment Failed */
.pix-status-failed {
    background: #fef2f2 !important;
    color: #991b1b !important;
}

.pix-status-failed i {
    color: #ef4444;
}

/* Desktop Layout */
@media (min-width: 1024px) {
    .checkout-main {
        max-width: 920px;
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 1.5rem;
        align-items: start;
        padding: 2rem;
    }

    .summary-card {
        position: sticky;
        top: 1rem;
    }
}