/* ===== Reset e base ===== */
*,
*::before,
*::after {
  box-sizing: border-box;
}

:root {
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-text: #1e293b;
  --color-text-muted: #64748b;
  --color-primary: #0f766e;
  --color-primary-hover: #0d9488;
  --color-border: #e2e8f0;
  --color-ad: #cbd5e1;
  --radius: 12px;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.06);
  --font-sans: "Segoe UI", system-ui, -apple-system, sans-serif;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ===== Utilitários ===== */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.container {
  width: 100%;
  max-width: 720px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* ===== Header ===== */
.header {
  padding: 2.5rem 0 1.75rem;
  background: var(--color-surface);
  box-shadow: var(--shadow);
}

.header .container {
  position: relative;
  padding-top: 2rem;
}

.title {
  margin: 0 0 0.5rem;
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 700;
  line-height: 1.25;
  color: var(--color-text);
}

.subtitle {
  margin: 0 0 1.5rem;
  font-size: 1rem;
  color: var(--color-text-muted);
}

/* ===== Language switcher ===== */
.lang-switcher {
  position: absolute;
  top: 0.25rem;
  right: 1.25rem;
  display: inline-flex;
  gap: 0.35rem;
  padding: 0.25rem;
  background: rgba(248, 250, 252, 0.9);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  box-shadow: var(--shadow);
}

.lang-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2.25rem;
  padding: 0.25rem 0.55rem;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-text-muted);
  text-decoration: none;
  border-radius: 999px;
  transition: color 0.2s, background 0.2s, transform 0.1s;
}

.lang-link:hover {
  color: var(--color-text);
  background: rgba(15, 118, 110, 0.08);
}

.lang-link[aria-current="page"] {
  color: #ffffff;
  background: var(--color-primary);
}

.lang-link:active {
  transform: scale(0.98);
}

/* ===== Home button ===== */
.home-button {
  position: fixed;
  right: 1rem;
  top: 5.5rem;
  z-index: 35;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1rem;
  min-height: 2.75rem;
  font-size: 0.9rem;
  font-weight: 700;
  color: #ffffff;
  background: var(--color-primary);
  border-radius: 999px;
  text-decoration: none;
  box-shadow: var(--shadow-lg);
  transition: transform 0.15s ease, background 0.2s ease, box-shadow 0.2s ease;
}

.home-button:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
}

.home-button:focus-visible {
  outline: 2px solid #ffffff;
  outline-offset: 3px;
}

.home-button:active {
  transform: translateY(0);
}

/* ===== Placeholders AdSense ===== */
.ad-placeholder {
  display: none;
  align-items: center;
  justify-content: center;
  background: var(--color-ad);
  color: var(--color-text-muted);
  font-size: 0.875rem;
  border-radius: var(--radius);
  min-height: 60px;
  text-align: center;
  padding: 0.75rem;
}

.ad-leaderboard {
  min-height: 90px;
  max-width: 728px;
  margin: 0 auto;
}

.ad-rectangle {
  min-height: 250px;
  max-width: 300px;
  margin: 1.5rem auto;
}

/* ===== Main ===== */
.main {
  flex: 1;
  padding: 2rem 0 3rem;
}

.converter {
  background: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  padding: 2rem;
  margin-bottom: 1rem;
}

/* ===== Seletor de formato ===== */
.format-selector {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--color-border);
}

.format-label {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text);
}

.format-options {
  display: flex;
  gap: 0.5rem;
}

.format-option {
  display: inline-flex;
  cursor: pointer;
  margin: 0;
}

.format-option input {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.format-option-label {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 4rem;
  padding: 0.5rem 1rem;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text-muted);
  background: var(--color-bg);
  border: 2px solid var(--color-border);
  border-radius: 8px;
  transition: color 0.2s, background 0.2s, border-color 0.2s;
}

.format-option:hover .format-option-label {
  color: var(--color-text);
  border-color: var(--color-primary);
  background: rgba(15, 118, 110, 0.06);
}

.format-option input:checked + .format-option-label {
  color: white;
  background: var(--color-primary);
  border-color: var(--color-primary);
}

.format-option input:focus-visible + .format-option-label {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ===== Drop zone ===== */
.drop-zone {
  border: 2px dashed var(--color-border);
  border-radius: var(--radius);
  padding: 2.5rem 1.5rem;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
}

.drop-zone:hover,
.drop-zone:focus {
  outline: none;
  border-color: var(--color-primary);
  background: rgba(15, 118, 110, 0.04);
}

.drop-zone.drag-over {
  border-color: var(--color-primary);
  background: rgba(15, 118, 110, 0.08);
}

.drop-zone-content {
  pointer-events: none;
}

.drop-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 1rem;
  display: block;
  color: var(--color-text-muted);
}

.drop-zone:hover .drop-icon,
.drop-zone:focus .drop-icon {
  color: var(--color-primary);
}

.drop-text {
  margin: 0 0 0.5rem;
  font-weight: 600;
  color: var(--color-text);
}

.drop-sub {
  margin: 0 0 1rem;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

/* ===== Botões ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.625rem 1.25rem;
  font-size: 1rem;
  font-family: inherit;
  font-weight: 600;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
}

.btn:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

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

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

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

.btn-download {
  background: #059669;
  color: white;
  margin-top: 0.75rem;
}

.btn-download:hover {
  background: #047857;
}

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

.file-input {
  position: absolute;
  width: 0;
  height: 0;
  opacity: 0;
}

/* ===== Barra de progresso ===== */
.progress-section {
  padding: 1.5rem 0;
}

.progress-label {
  margin: 0 0 0.75rem;
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-primary);
  text-align: center;
}

.progress-track {
  height: 10px;
  background: var(--color-border);
  border-radius: 999px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-primary-hover));
  border-radius: 999px;
  transition: width 0.15s ease-out;
}

/* ===== Resultado ===== */
.result {
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
  text-align: center;
}

.result-info {
  margin: 0 0 0.5rem;
  font-size: 0.95rem;
  color: var(--color-text-muted);
}

/* ===== Seções de conteúdo ===== */
.how-it-works,
.faq {
  margin-top: 2.5rem;
}

.how-it-works h2,
.faq h2 {
  margin: 0 0 1rem;
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-text);
}

.how-it-works p {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 1rem;
}

.faq-item {
  margin-bottom: 1.5rem;
  padding: 1.25rem;
  background: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.faq-question {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-text);
}

.faq-answer {
  margin: 0;
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ===== Footer ===== */
.footer {
  padding: 2rem 0;
  margin-top: 2rem;
  background: #1e293b;
  border-top: none;
  text-align: center;
}

.footer .container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem 1.5rem;
}

.footer-nav a {
  font-size: 0.9rem;
  color: #f8fafc;
  text-decoration: none;
  transition: color 0.2s;
}

.footer-nav a:hover {
  color: #94a3b8;
}

.footer-copy {
  margin: 0;
  font-size: 0.875rem;
  color: #cbd5e1;
}

.cookie-footer-link {
  margin: 0;
  font-size: 0.8rem;
  color: #cbd5e1;
  text-decoration: underline;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

.cookie-footer-link:hover {
  color: #f8fafc;
}

.cookie-banner {
  position: fixed;
  inset-inline: 0;
  bottom: 0;
  z-index: 40;
  padding: 1rem;
  pointer-events: none;
}

.cookie-banner-inner {
  max-width: 960px;
  margin: 0 auto;
  background: #0f172a;
  color: #e5e7eb;
  border-radius: 12px;
  box-shadow: 0 10px 25px rgba(15, 23, 42, 0.6);
  padding: 1rem 1.25rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1.5rem;
  pointer-events: auto;
}

.cookie-text {
  flex: 1 1 260px;
  margin: 0;
  font-size: 0.85rem;
  line-height: 1.5;
}

.cookie-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: flex-end;
}

.cookie-btn {
  font-size: 0.85rem;
  padding: 0.45rem 0.9rem;
  background: #22c55e;
  color: #020617;
  border-radius: 999px;
  border: none;
}

.cookie-btn:hover {
  background: #16a34a;
}

.cookie-btn-primary {
  background: #22c55e;
}

.cookie-btn-primary:hover {
  background: #16a34a;
}

.cookie-btn-ghost {
  background: #22c55e;
  color: #020617;
  border: none;
}

.cookie-btn-ghost:hover {
  background: #16a34a;
}

@media (max-width: 480px) {
  .footer-nav {
    display: grid;
    grid-template-columns: 1fr 1fr;
    justify-items: center;
    text-align: center;
    gap: 0.75rem;
  }

  .footer-nav a {
    font-size: 0.85rem;
  }
}

/* ===== Responsivo ===== */
@media (max-width: 480px) {
  .header {
    padding: 1.25rem 0 1rem;
  }

  .lang-switcher {
    position: static;
    justify-content: flex-end;
    margin: 0 0 1rem;
    width: 100%;
  }

  .home-button {
    right: 0.75rem;
    top: 4.5rem;
    padding: 0.65rem 0.95rem;
    font-size: 0.85rem;
  }

  .converter {
    padding: 1.25rem;
  }

  .drop-zone {
    padding: 1.5rem 1rem;
  }

  .ad-leaderboard {
    min-height: 50px;
    font-size: 0.75rem;
  }

  .ad-rectangle {
    min-height: 200px;
  }
}