/* ============ DESIGN SYSTEM — Dopamin-Reset ============ */
/* Basis: "Warm Clinical" (Teal + Source Serif 4 + Inter) */

:root {
    --color-bg: #fafaf9;
    --color-surface: #ffffff;
    --color-text: #18181b;
    --color-text-muted: #71717a;
    --color-primary: #0d9488;
    --color-primary-hover: #0f766e;
    --color-primary-light: #f0fdfa;
    --color-border: #e5e5e5;
    --color-success: #16a34a;
    --color-success-bg: #f0fdf4;
    --color-error: #dc2626;
    --color-whatsapp: #25d366;
    --color-whatsapp-hover: #1da851;

    --font-serif: 'Source Serif 4', Georgia, serif;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    --radius: 12px;
    --radius-sm: 8px;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --max-width: 640px;
}

/* ============ RESET ============ */

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

body {
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
}

/* ============ LAYOUT ============ */

.screen {
    display: none;
}

.screen.active {
    display: block;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* ============ BUTTONS ============ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-sans);
    font-size: 1rem;
    font-weight: 600;
    line-height: 1;
    border: 2px solid transparent;
    border-radius: var(--radius);
    cursor: pointer;
    transition: background-color 0.15s, border-color 0.15s, transform 0.1s;
    text-decoration: none;
}

.btn:active {
    transform: scale(0.98);
}

.btn-primary {
    background-color: var(--color-primary);
    color: #fff;
    padding: 16px 32px;
    width: 100%;
    max-width: 400px;
}

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

.btn-secondary {
    background-color: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
    padding: 12px 24px;
}

.btn-secondary:hover {
    background-color: var(--color-primary-light);
}

.btn-back {
    background: none;
    border: none;
    color: var(--color-text-muted);
    font-size: 0.9375rem;
    padding: 8px 0;
    cursor: pointer;
}

.btn-back:hover {
    color: var(--color-text);
}

.btn-sm {
    font-size: 0.875rem;
    padding: 8px 16px;
}

.btn-whatsapp {
    background-color: var(--color-whatsapp);
    color: #fff;
    padding: 14px 28px;
    width: 100%;
    max-width: 400px;
    font-size: 1rem;
}

.btn-whatsapp:hover {
    background-color: var(--color-whatsapp-hover);
}

.btn-loading {
    opacity: 0.7;
    pointer-events: none;
    position: relative;
}

.btn-loading::after {
    content: '';
    position: absolute;
    right: 16px;
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* ============ HERO ============ */

.hero {
    text-align: center;
    padding: clamp(60px, 10vw, 80px) 0 clamp(32px, 6vw, 40px);
}

.hero-headline {
    font-family: var(--font-serif);
    font-size: clamp(1.75rem, 5vw, 2.25rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 16px;
    color: var(--color-text);
}

.hero-sub {
    font-size: clamp(1rem, 2.5vw, 1.125rem);
    color: var(--color-text-muted);
    margin-bottom: 32px;
    max-width: 480px;
    margin-left: auto;
    margin-right: auto;
}

/* ============ BENEFITS ============ */

.benefits {
    padding: 48px 0;
}

.section-title {
    font-family: var(--font-serif);
    font-size: 1.375rem;
    font-weight: 600;
    margin-bottom: 20px;
    text-align: center;
}

.benefit-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.benefit-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    font-size: 1rem;
    line-height: 1.5;
}

.benefit-icon {
    color: var(--color-primary);
    font-weight: 700;
    font-size: 1.125rem;
    flex-shrink: 0;
    margin-top: 1px;
}

/* ============ PROBLEM ============ */

.problem {
    padding: 56px 0;
    background-color: var(--color-surface);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
    margin: 0 -20px;
    padding-left: 20px;
    padding-right: 20px;
}

.problem-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.problem-list li {
    position: relative;
    padding-left: 24px;
    font-size: 0.9375rem;
    line-height: 1.6;
    color: var(--color-text-muted);
}

.problem-list li::before {
    content: '—';
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: 600;
}

/* ============ HOW IT WORKS ============ */

.how-it-works {
    padding: 56px 0;
}

.steps {
    display: flex;
    flex-direction: column;
    gap: 28px;
    margin-top: 8px;
}

.step {
    text-align: center;
}

.step-icon {
    color: var(--color-primary);
    margin-bottom: 12px;
}

.step-title {
    font-size: 1.0625rem;
    font-weight: 600;
    margin-bottom: 6px;
}

.step-text {
    font-size: 0.9375rem;
    color: var(--color-text-muted);
    max-width: 360px;
    margin: 0 auto;
}

/* ============ FAQ ============ */

.faq {
    padding: 56px 0;
    background-color: var(--color-surface);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
    margin: 0 -20px;
    padding-left: 20px;
    padding-right: 20px;
}

.faq-list {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.faq-item {
    border-bottom: 1px solid var(--color-border);
    padding: 16px 0;
}

.faq-item:first-child {
    border-top: 1px solid var(--color-border);
}

.faq-item summary {
    font-weight: 600;
    font-size: 0.9375rem;
    cursor: pointer;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item summary::after {
    content: '+';
    font-size: 1.25rem;
    color: var(--color-text-muted);
    flex-shrink: 0;
    margin-left: 16px;
    transition: transform 0.2s;
}

.faq-item[open] summary::after {
    content: '\2212';
}

.faq-item p {
    margin-top: 10px;
    font-size: 0.9375rem;
    line-height: 1.6;
    color: var(--color-text-muted);
}

/* ============ FINAL CTA ============ */

.final-cta {
    text-align: center;
    padding: 72px 0 40px;
}

.final-cta-text {
    color: var(--color-text-muted);
    margin-bottom: 24px;
    font-size: 1rem;
}

/* ============ FOOTER ============ */

.footer {
    text-align: center;
    padding: 32px 0;
    border-top: 1px solid var(--color-border);
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.footer-disclaimer {
    margin-top: 12px;
    font-size: 0.75rem;
    line-height: 1.5;
    max-width: 480px;
    margin-left: auto;
    margin-right: auto;
}

.footer-links {
    margin-top: 12px;
    display: flex;
    justify-content: center;
    gap: 20px;
}

.footer-links a {
    color: var(--color-text-muted);
    text-decoration: none;
    font-size: 0.8rem;
}

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

/* ============ QUIZ ============ */

.quiz-header {
    padding: 24px 0 16px;
}

.progress-bar {
    height: 4px;
    background-color: var(--color-border);
    border-radius: 2px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background-color: var(--color-success);
    border-radius: 2px;
    transition: width 0.3s ease;
}

.progress-text {
    display: block;
    text-align: center;
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    margin-top: 8px;
}

.quiz-body {
    padding: 16px 0 24px;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.quiz-question {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: 24px;
}

.quiz-options {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.quiz-option {
    padding: 16px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 0.9375rem;
    line-height: 1.4;
    transition: border-color 0.15s, background-color 0.15s;
}

.quiz-option:hover {
    border-color: var(--color-primary);
    background-color: var(--color-primary-light);
}

.quiz-option.selected {
    border-color: var(--color-primary);
    background-color: var(--color-primary-light);
}

.quiz-nav {
    padding: 0 0 32px;
}

/* ============ TRANSITION ============ */

.transition-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 60vh;
    text-align: center;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-bottom: 24px;
}

.transition-text {
    font-size: 1rem;
    color: var(--color-text-muted);
    transition: opacity 0.3s;
}

/* ============ RESULT ============ */

.result-header {
    text-align: center;
    padding: 48px 0 32px;
}

.result-label {
    display: inline-block;
    font-size: 0.8125rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--color-primary);
    margin-bottom: 12px;
}

.result-headline {
    font-family: var(--font-serif);
    font-size: clamp(1.5rem, 4vw, 1.875rem);
    font-weight: 700;
    line-height: 1.25;
    margin-bottom: 16px;
}

.result-intro {
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-text-muted);
}

.result-details {
    display: flex;
    flex-direction: column;
    gap: 24px;
    margin-bottom: 40px;
}

.result-block {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 24px;
}

.result-block-title {
    font-size: 0.9375rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--color-primary);
    margin-bottom: 8px;
}

.result-block p {
    font-size: 0.9375rem;
    line-height: 1.6;
    color: var(--color-text-muted);
}

/* ============ EMAIL CAPTURE ============ */

.email-capture {
    text-align: center;
    background-color: var(--color-surface);
    border: 2px solid var(--color-primary);
    border-radius: var(--radius);
    padding: 32px 24px;
    margin-bottom: 24px;
}

.email-headline {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.email-subline {
    font-size: 0.9375rem;
    color: var(--color-text-muted);
    margin-bottom: 16px;
}

.email-benefits {
    list-style: none;
    text-align: left;
    margin-bottom: 20px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.email-benefits li {
    font-size: 0.9375rem;
    padding-left: 24px;
    position: relative;
}

.email-benefits li::before {
    content: '✓';
    content: '\2713';
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: 700;
}

.email-form {
    margin-bottom: 12px;
}

.email-input-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.email-input {
    padding: 14px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-family: var(--font-sans);
    font-size: 1rem;
    width: 100%;
    transition: border-color 0.15s;
}

.email-input:focus {
    outline: none;
    border-color: var(--color-primary);
}

.email-input.input-error {
    border-color: var(--color-error);
}

.email-submit {
    width: 100%;
}

.email-error {
    color: var(--color-error);
    font-size: 0.8125rem;
    margin-top: 8px;
    text-align: left;
}

.email-trust {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-top: 8px;
}

/* ============ OFFER CARD ============ */

.offer-card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 20px;
    padding: 40px 28px;
    text-align: center;
    margin-bottom: 40px;
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.06), 0 1px 4px rgba(0, 0, 0, 0.04);
    position: relative;
}

.offer-badge {
    display: inline-block;
    background-color: var(--color-primary);
    color: #fff;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    padding: 6px 16px;
    border-radius: 100px;
    margin-bottom: 24px;
}

.offer-title {
    font-family: var(--font-serif);
    font-size: 1.625rem;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 12px;
}

.offer-subtitle {
    font-size: 0.9375rem;
    color: var(--color-text-muted);
    line-height: 1.6;
    max-width: 300px;
    margin: 0 auto;
}

.offer-divider {
    height: 1px;
    background-color: var(--color-border);
    margin: 24px auto;
    max-width: 80px;
}

.offer-features {
    list-style: none;
    padding: 0;
    margin: 0;
    text-align: left;
    max-width: 320px;
    margin-left: auto;
    margin-right: auto;
}

.offer-features li {
    position: relative;
    padding-left: 32px;
    margin-bottom: 14px;
    font-size: 0.9375rem;
    line-height: 1.55;
}

.offer-features li:last-child {
    margin-bottom: 0;
}

.offer-features li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 3px;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background-color: var(--color-primary-light);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%230d9488' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: center;
    background-size: 11px;
}

.offer-price {
    padding: 8px 0 4px;
}

.offer-amount {
    display: block;
    font-family: var(--font-serif);
    font-size: 3rem;
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1;
    letter-spacing: -0.02em;
}

.offer-period {
    display: block;
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    margin-top: 6px;
}

.btn-offer {
    width: 100%;
    max-width: 340px;
    padding: 18px 28px;
    font-size: 1.0625rem;
    font-weight: 600;
    margin-top: 20px;
    border-radius: 14px;
    box-shadow: 0 4px 12px rgba(37, 211, 102, 0.25);
    transition: background-color 0.2s ease, box-shadow 0.2s ease, transform 0.15s ease;
}

.btn-offer:hover {
    box-shadow: 0 6px 20px rgba(37, 211, 102, 0.35);
}

.offer-meta {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 16px;
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

.offer-meta-dot {
    width: 3px;
    height: 3px;
    border-radius: 50%;
    background-color: var(--color-text-muted);
    opacity: 0.4;
    flex-shrink: 0;
}

/* ============ PROMISE ============ */

.promise {
    text-align: center;
    margin-bottom: 40px;
    padding: 0;
}

.promise-title {
    font-family: var(--font-serif);
    font-size: 1.1875rem;
    font-weight: 600;
    margin-bottom: 20px;
}

.promise-list {
    list-style: none;
    padding: 0;
    margin: 0;
    text-align: left;
    max-width: 360px;
    margin-left: auto;
    margin-right: auto;
}

.promise-list li {
    position: relative;
    padding-left: 32px;
    margin-bottom: 12px;
    font-size: 0.9375rem;
    color: var(--color-text-muted);
    line-height: 1.55;
}

.promise-list li:last-child {
    margin-bottom: 0;
}

.promise-list li::before {
    content: '\2192';
    position: absolute;
    left: 0;
    color: var(--color-primary);
}

/* ============ WHATSAPP CAPTURE ============ */

.whatsapp-capture {
    text-align: center;
    margin-bottom: 32px;
}

.whatsapp-divider {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 20px;
}

.whatsapp-divider::before,
.whatsapp-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background-color: var(--color-border);
}

.whatsapp-divider span {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
}

.whatsapp-headline {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.whatsapp-subline {
    font-size: 0.9375rem;
    color: var(--color-text-muted);
    margin-bottom: 16px;
}

.whatsapp-trust {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-top: 10px;
}

/* ============ EMAIL SUCCESS ============ */

.email-success {
    text-align: center;
    background-color: var(--color-success-bg);
    border-radius: var(--radius);
    padding: 40px 24px;
    margin-bottom: 32px;
}

.success-icon {
    width: 56px;
    height: 56px;
    background-color: var(--color-success);
    color: #fff;
    font-size: 1.5rem;
    font-weight: 700;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
}

.success-headline {
    font-family: var(--font-serif);
    font-size: 1.375rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.success-text {
    font-size: 0.9375rem;
    color: var(--color-text-muted);
    margin-bottom: 24px;
    line-height: 1.6;
}

.success-actions {
    display: flex;
    flex-direction: column;
    gap: 12px;
    align-items: center;
}

/* ============ RESPONSIVE ============ */

@media (min-width: 480px) {
    .email-input-group {
        flex-direction: row;
    }

    .email-input {
        flex: 1;
    }

    .email-submit {
        width: auto;
        white-space: nowrap;
    }
}