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

:root {
    --navy: #1a1a2e;
    --indigo: #4f46e5;
    --indigo-hover: #4338ca;
    --green: #059669;
    --red: #dc2626;
    --orange: #d97706;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-500: #6b7280;
    --gray-700: #374151;
    --gray-900: #111827;
}

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: var(--gray-900);
    background: #fff;
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 1.5rem;
    width: 100%;
}

/* Header */
header {
    padding: 2rem 0 1rem;
    text-align: center;
}

.logo {
    font-size: 2rem;
    font-weight: 800;
    color: var(--navy);
    letter-spacing: -0.02em;
}

.logo span {
    color: var(--indigo);
}

.tagline {
    font-size: 1.25rem;
    color: var(--gray-700);
    margin-top: 0.5rem;
    font-weight: 500;
}

.sub-tagline {
    font-size: 0.9rem;
    color: var(--gray-500);
    margin-top: 0.25rem;
}

/* Main content */
main {
    flex: 1;
    padding: 2rem 0;
}

/* Sections / states */
.state {
    display: none;
}

.state.active {
    display: block;
}

/* Upload area */
.upload-area {
    border: 2px dashed var(--gray-300);
    border-radius: 12px;
    padding: 3rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s;
    background: var(--gray-50);
}

.upload-area:hover,
.upload-area.dragover {
    border-color: var(--indigo);
    background: #eef2ff;
}

.upload-area svg {
    width: 48px;
    height: 48px;
    color: var(--gray-500);
    margin-bottom: 1rem;
}

.upload-area.dragover svg {
    color: var(--indigo);
}

.upload-text {
    font-size: 1.1rem;
    color: var(--gray-700);
    margin-bottom: 0.5rem;
}

.upload-hint {
    font-size: 0.85rem;
    color: var(--gray-500);
}

.upload-area input[type="file"] {
    display: none;
}

.help-link {
    display: inline-block;
    margin-top: 1rem;
    color: var(--indigo);
    font-size: 0.9rem;
    cursor: pointer;
    text-decoration: underline;
}

/* Loading */
.loading-container {
    text-align: center;
    padding: 3rem 0;
}

.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--gray-200);
    border-top-color: var(--indigo);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto 1.5rem;
}

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

.loading-text {
    font-size: 1.1rem;
    color: var(--gray-700);
}

/* Result cards */
.result-card {
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1rem;
}

.result-card h3 {
    font-size: 1rem;
    color: var(--gray-500);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.75rem;
}

/* Scenarios comparison */
.scenarios-comparison {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.scenario-card {
    flex: 1;
    border-radius: 12px;
    padding: 1.25rem;
    text-align: center;
}

.scenario-actual {
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
}

.scenario-optimo {
    background: #ecfdf5;
    border: 1px solid #a7f3d0;
}

.scenario-label {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--gray-500);
    margin-bottom: 0.5rem;
}

.scenario-value {
    font-size: 1.5rem;
    font-weight: 800;
    line-height: 1.2;
}

.scenario-actual .scenario-value {
    color: var(--gray-700);
}

.scenario-optimo .scenario-value {
    color: var(--green);
}

.scenario-sublabel {
    font-size: 0.8rem;
    color: var(--gray-500);
    margin-top: 0.25rem;
}

.scenario-arrow {
    font-size: 1.5rem;
    color: var(--gray-300);
    flex-shrink: 0;
}

/* Gain highlight */
.gain-highlight {
    background: linear-gradient(135deg, #ecfdf5, #d1fae5);
    border: 1px solid #a7f3d0;
    border-radius: 12px;
    padding: 1.25rem;
    text-align: center;
    margin-bottom: 1.5rem;
}

.gain-amount {
    font-size: 2rem;
    font-weight: 800;
    color: var(--green);
    line-height: 1;
}

.gain-label {
    font-size: 0.9rem;
    color: var(--gray-700);
    margin-top: 0.25rem;
}

/* Optimized (no gain) */
.optimized-highlight {
    background: linear-gradient(135deg, #eff6ff, #dbeafe);
    border: 1px solid #93c5fd;
    border-radius: 12px;
    padding: 2rem;
    text-align: center;
    margin-bottom: 1.5rem;
}

.optimized-highlight .gain-amount {
    color: var(--indigo);
    font-size: 1.5rem;
}

/* Errors list */
.error-item {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--gray-200);
}

.error-item:last-child {
    border-bottom: none;
}

.error-badge {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.15rem 0.5rem;
    border-radius: 4px;
    white-space: nowrap;
    flex-shrink: 0;
}

.error-badge.erro {
    background: #fef2f2;
    color: var(--red);
}

.error-badge.aviso {
    background: #fffbeb;
    color: var(--orange);
}

.error-desc {
    font-size: 0.9rem;
    color: var(--gray-700);
}

/* Alteracoes list */
.alteracao-item {
    padding: 0.5rem 0;
    font-size: 0.95rem;
    color: var(--gray-700);
    border-bottom: 1px solid var(--gray-100);
}

.alteracao-item:last-child {
    border-bottom: none;
}

.alteracao-item::before {
    content: "\2192 ";
    color: var(--indigo);
    font-weight: 600;
}

/* CTA button */
.btn-primary {
    display: block;
    width: 100%;
    padding: 1rem;
    background: var(--indigo);
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
    text-align: center;
    text-decoration: none;
}

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

.btn-primary:disabled {
    background: var(--gray-300);
    cursor: not-allowed;
}

.btn-secondary {
    display: block;
    width: 100%;
    padding: 0.75rem;
    background: #fff;
    color: var(--indigo);
    border: 2px solid var(--indigo);
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
    text-align: center;
    text-decoration: none;
    margin-top: 0.75rem;
}

.btn-secondary:hover {
    background: #eef2ff;
}

.checkout-desc {
    text-align: center;
    font-size: 0.8rem;
    color: var(--gray-500);
    margin-top: 0.5rem;
    margin-bottom: 1rem;
}

/* Complexity */
.complexity-msg {
    background: #fffbeb;
    border: 1px solid #fcd34d;
    border-radius: 12px;
    padding: 2rem;
    text-align: center;
}

.complexity-msg p {
    font-size: 1rem;
    color: var(--gray-700);
    margin-bottom: 1rem;
}

/* Report */
.report-container {
    background: #fff;
    border: 1px solid var(--gray-200);
    border-radius: 12px;
    padding: 2rem;
    margin-bottom: 1.5rem;
}

.report-container p {
    margin-bottom: 0.75rem;
}

.report-container ul {
    margin-left: 1.5rem;
    margin-bottom: 0.75rem;
}

.report-container li {
    margin-bottom: 0.25rem;
}

.report-container strong {
    color: var(--navy);
}

/* Error message */
.error-msg {
    background: #fef2f2;
    border: 1px solid #fecaca;
    border-radius: 8px;
    padding: 1rem 1.5rem;
    color: var(--red);
    text-align: center;
    margin-bottom: 1rem;
}

/* Modal */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 100;
    align-items: center;
    justify-content: center;
}

.modal-overlay.active {
    display: flex;
}

.modal {
    background: #fff;
    border-radius: 12px;
    padding: 2rem;
    max-width: 520px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
}

.modal h3 {
    font-size: 1.1rem;
    color: var(--navy);
    margin-bottom: 1rem;
}

.modal ol {
    margin-left: 1.5rem;
}

.modal li {
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
    color: var(--gray-700);
}

.modal-close {
    display: block;
    margin-top: 1.5rem;
    padding: 0.5rem 1.5rem;
    background: var(--gray-100);
    border: 1px solid var(--gray-300);
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    margin-left: auto;
}

/* Confidence badge */
.confianca-badge {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    font-size: 0.85rem;
    flex-wrap: wrap;
}

.confianca-alto {
    background: #ecfdf5;
    border: 1px solid #a7f3d0;
}

.confianca-medio {
    background: #fffbeb;
    border: 1px solid #fcd34d;
}

.confianca-baixo {
    background: #fef2f2;
    border: 1px solid #fecaca;
}

.confianca-icon {
    font-size: 1rem;
    flex-shrink: 0;
}

.confianca-label {
    font-weight: 600;
    color: var(--navy);
}

.confianca-razoes {
    color: var(--gray-500);
    font-size: 0.8rem;
    flex-basis: 100%;
    margin-top: 0.15rem;
}

/* Calculation trace */
.trace-details {
    margin-bottom: 1rem;
}

.trace-details summary {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--indigo);
    cursor: pointer;
    padding: 0.5rem 0;
}

.trace-table {
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: 8px;
    padding: 0.75rem;
    margin-top: 0.25rem;
}

.trace-row {
    display: grid;
    grid-template-columns: 1.5rem 1fr auto;
    gap: 0.5rem;
    align-items: baseline;
    padding: 0.3rem 0;
    border-bottom: 1px solid var(--gray-100);
    font-size: 0.82rem;
}

.trace-row:last-child {
    border-bottom: none;
}

.trace-tipo {
    text-align: center;
    font-size: 0.75rem;
}

.trace-exact {
    color: var(--green);
}

.trace-estimated {
    color: var(--orange);
}

.trace-label {
    color: var(--gray-700);
}

.trace-valor {
    font-weight: 600;
    color: var(--navy);
    text-align: right;
    white-space: nowrap;
}

.trace-result {
    font-weight: 700;
    font-size: 0.9rem;
}

.trace-nota {
    grid-column: 2 / -1;
    font-size: 0.75rem;
    color: var(--gray-500);
    font-style: italic;
}

/* IRS Jovem */
.irs-jovem-card {
    background: linear-gradient(135deg, #fef3c7, #fffbeb);
    border-color: #f59e0b;
}

.irs-jovem-card h3 {
    color: #92400e;
}

.irs-jovem-card p {
    font-size: 0.9rem;
    color: var(--gray-700);
    margin-bottom: 0.75rem;
}

.irs-jovem-form {
    display: flex;
    gap: 0.75rem;
    align-items: flex-end;
    flex-wrap: wrap;
}

.irs-jovem-field {
    flex: 1;
    min-width: 120px;
}

.irs-jovem-field label {
    display: block;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: 0.25rem;
}

.irs-jovem-field input {
    width: 100%;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--gray-300);
    border-radius: 6px;
    font-size: 0.9rem;
    background: #fff;
}

.btn-small {
    padding: 0.5rem 1.25rem;
    font-size: 0.9rem;
    width: auto;
    flex-shrink: 0;
}

.ij-eligible {
    margin-top: 1rem;
    padding: 1rem;
    background: #fff;
    border-radius: 8px;
    border: 1px solid #a7f3d0;
}

.ij-saving {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--green);
    text-align: center;
}

.ij-saving-label {
    text-align: center;
    font-size: 0.85rem;
    color: var(--gray-500);
    margin-bottom: 0.75rem;
}

.ij-eligible p {
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
}

.ij-action {
    background: #f0fdf4;
    padding: 0.5rem 0.75rem;
    border-radius: 6px;
    font-size: 0.8rem !important;
}

.ij-not-eligible {
    margin-top: 0.75rem;
    font-size: 0.9rem;
    color: var(--gray-500);
}

.ij-error {
    margin-top: 0.75rem;
    font-size: 0.9rem;
    color: var(--orange);
}

/* Recommendations */
.recs-intro {
    font-size: 0.85rem;
    color: var(--gray-500);
    margin-bottom: 1rem;
}

.rec-item {
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--gray-100);
}

.rec-item:last-child {
    border-bottom: none;
}

.rec-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.35rem;
}

.rec-header strong {
    font-size: 0.95rem;
    color: var(--navy);
}

.rec-badge {
    font-size: 0.65rem;
    font-weight: 700;
    padding: 0.1rem 0.4rem;
    border-radius: 3px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    flex-shrink: 0;
}

.rec-alta {
    background: #ecfdf5;
    color: var(--green);
}

.rec-media {
    background: #eff6ff;
    color: var(--indigo);
}

.rec-baixa {
    background: var(--gray-100);
    color: var(--gray-500);
}

.rec-item p {
    font-size: 0.85rem;
    color: var(--gray-700);
    line-height: 1.5;
    margin: 0;
}

.rec-saving {
    display: inline-block;
    margin-top: 0.35rem;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--green);
}

/* Info sections */
.info-section {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--gray-200);
}

.info-section h2 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--navy);
    margin-bottom: 1.25rem;
}

.info-subtitle {
    font-size: 1rem;
    font-weight: 600;
    color: var(--indigo);
    margin-bottom: 0.5rem;
}

.info-lead {
    font-size: 0.9rem;
    color: var(--gray-500);
    margin-bottom: 1rem;
    line-height: 1.5;
}

/* Steps */
.steps-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
}

.step {
    text-align: center;
}

.step-number {
    width: 36px;
    height: 36px;
    background: var(--indigo);
    color: #fff;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1rem;
    margin-bottom: 0.75rem;
}

.step h3 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--navy);
    margin-bottom: 0.35rem;
}

.step p {
    font-size: 0.85rem;
    color: var(--gray-500);
    line-height: 1.5;
}

/* Features */
.features-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.feature {
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: 10px;
    padding: 1.25rem;
}

.feature-icon {
    color: var(--indigo);
    margin-bottom: 0.5rem;
}

.feature strong {
    display: block;
    font-size: 0.9rem;
    color: var(--navy);
    margin-bottom: 0.35rem;
}

.feature p {
    font-size: 0.8rem;
    color: var(--gray-500);
    line-height: 1.5;
}

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

.faq-item {
    border-bottom: 1px solid var(--gray-200);
}

.faq-item:first-child {
    border-top: 1px solid var(--gray-200);
}

.faq-item summary {
    padding: 1rem 0;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--navy);
    cursor: pointer;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-item summary::after {
    content: "+";
    font-size: 1.25rem;
    font-weight: 400;
    color: var(--gray-500);
    flex-shrink: 0;
    margin-left: 1rem;
}

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

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

.faq-item p {
    padding: 0 0 1rem;
    font-size: 0.9rem;
    color: var(--gray-700);
    line-height: 1.6;
}

/* Footer */
footer {
    padding: 2rem 0;
    text-align: center;
    border-top: 1px solid var(--gray-200);
    margin-top: 2rem;
}

.disclaimer {
    font-size: 0.8rem;
    color: var(--gray-500);
    max-width: 500px;
    margin: 0 auto;
}

/* Checkout layout */
.checkout-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    min-height: 500px;
}

.checkout-left h3,
.checkout-right h3 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--navy);
    margin-bottom: 1rem;
}

.checkout-right {
    display: flex;
    flex-direction: column;
}

.tc-scroll {
    flex: 1;
    overflow-y: auto;
    font-size: 0.78rem;
    color: var(--gray-700);
    line-height: 1.5;
    padding-right: 0.5rem;
    border: 1px solid var(--gray-200);
    border-radius: 8px;
    padding: 1rem;
    background: var(--gray-50);
}

.tc-scroll p {
    margin-bottom: 0.75rem;
}

.tc-accept-box {
    margin-top: 0.75rem;
    padding: 0.6rem 0.75rem;
    background: #fffbeb;
    border: 1px solid #fcd34d;
    border-radius: 8px;
}

.tc-accept-box label {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    cursor: pointer;
    font-size: 0.82rem;
    color: var(--gray-700);
}

.tc-accept-box input {
    margin-top: 0.15rem;
    flex-shrink: 0;
}

/* Responsive */
@media (max-width: 640px) {
    .logo { font-size: 1.5rem; }
    .tagline { font-size: 1rem; }
    .gain-amount { font-size: 1.5rem; }
    .upload-area { padding: 2rem 1rem; }
    .scenarios-comparison { flex-direction: column; }
    .scenario-arrow { transform: rotate(90deg); }
    .scenario-value { font-size: 1.25rem; }
    .steps-grid { grid-template-columns: 1fr; gap: 1.5rem; }
    .features-grid { grid-template-columns: 1fr; }
    .checkout-layout { grid-template-columns: 1fr; }
}