/* ============================================
   TEMA BASE (LIGHT MODE) - PROFISSIONAL
   ============================================ */
:root {
  --bg-gradient-start: #6366f1;
  --bg-gradient-end: #8b5cf6;
  --card-bg: #ffffff;
  --card-border: #e5e7eb;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --border-color: #e2e8f0;
  --checkbox-bg: #f8fafc;
  --checkbox-border: #cbd5e1;
  --checkbox-hover: #f1f5f9;
  --success-bg: #dcfce7;
  --success-border: #4ade80;
  --success-icon-bg: #22c55e;
  --overlay-bg: rgba(15, 23, 42, 0.85);
  --spinner-track: rgba(0, 0, 0, 0.08);
  --spinner-head: #6366f1;
  --shadow-soft: 0 10px 30px -5px rgba(99, 102, 241, 0.12);
  --radius: 16px;
}

/* ============================================
   TEMA ESCURO (DARK MODE) - MODERNO & POLIDO
   ============================================ */
@media (prefers-color-scheme: dark) {
  :root {
    --bg-gradient-start: #0b0f19;
    --bg-gradient-end: #151b2e;
    --card-bg: #0f1524;
    --card-border: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --border-color: #1e293b;
    --checkbox-bg: #151d2e;
    --checkbox-border: #2a3a52;
    --checkbox-hover: #1e2d45;
    --success-bg: #022c22;
    --success-border: #065f46;
    --success-icon-bg: #10b981;
    --overlay-bg: rgba(2, 6, 23, 0.92);
    --spinner-track: rgba(255, 255, 255, 0.05);
    --spinner-head: #818cf8;
    --shadow-soft: 0 10px 40px -10px rgba(0, 0, 0, 0.65);
  }
}

/* ============================================
   RESET & LAYOUT
   ============================================ */
* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background: linear-gradient(135deg, var(--bg-gradient-start), var(--bg-gradient-end));
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
  padding: 16px;
  transition: background 0.3s ease;
}

/* ============================================
   CONTAINER PRINCIPAL
   ============================================ */
.captcha-container {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 28px 20px;
  width: 100%;
  max-width: 400px;
  box-shadow: var(--shadow-soft);
  text-align: center;
  position: relative;
  animation: slideUp 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ============================================
   IMAGEM CAPTCHA
   ============================================ */
.captcha-image-wrapper {
  margin-bottom: 20px;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border-color);
  background: var(--checkbox-bg);
}

.captcha-image-wrapper svg { width: 100%; height: auto; display: block; }

/* ============================================
   CHECKBOX (ALINHAMENTO PERFEITO)
   ============================================ */
.captcha-checkbox-wrapper { margin-bottom: 16px; }

.captcha-checkbox {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--checkbox-bg);
  border: 2px solid var(--checkbox-border);
  border-radius: 12px;
  padding: 14px 18px;
  cursor: pointer;
  transition: all 0.2s ease;
  width: 100%;
  max-width: 320px;
  margin: 0 auto;
  touch-action: manipulation;
}

.captcha-checkbox:active { transform: scale(0.98); background: var(--checkbox-hover); }
.captcha-checkbox.verifying { opacity: 0.85; background: #fffbeb; border-color: #fcd34d; pointer-events: none; }
.captcha-checkbox.verified { background: var(--success-bg); border-color: var(--success-border); cursor: default; }

.captcha-checkbox input { display: none; }

.checkbox-inner {
  width: 26px;
  height: 26px;
  background: white;
  border: 2px solid var(--checkbox-border);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all 0.25s ease;
}

@media (prefers-color-scheme: dark) {
  .checkbox-inner { background: #151d2e; border-color: #2a3a52; }
}

.check-icon {
  width: 16px;
  height: 16px;
  fill: transparent;
  transition: fill 0.25s ease;
}

.captcha-checkbox.verified .checkbox-inner {
  background: var(--success-icon-bg);
  border-color: var(--success-icon-bg);
}

.captcha-checkbox.verified .check-icon { fill: white; }

.captcha-label {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-primary);
  line-height: 1.35;
  user-select: none;
}

/* ============================================
   BRANDING & DISCLAIMER
   ============================================ */
.captcha-branding {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  margin-top: 12px;
  color: var(--text-secondary);
  font-size: 11px;
  font-weight: 500;
}

.captcha-disclaimer {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--border-color);
}

.captcha-disclaimer p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
  font-weight: 400;
}

/* ============================================
   LOADING OVERLAY (ALINHAMENTO PERFEITO)
   ============================================ */
#loading-overlay {
  position: fixed;
  inset: 0;
  background: var(--overlay-bg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 20px;
  z-index: 9999;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  padding: 24px;
  transition: opacity 0.25s ease;
  user-select: none;
  overscroll-behavior: none;
}

#loading-overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.loading-spinner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}

.spinner {
  width: 54px;
  height: 54px;
  border: 4px solid var(--spinner-track);
  border-top-color: var(--spinner-head);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  flex-shrink: 0;
  box-sizing: border-box;
}

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

.loading-text {
  color: #f8fafc;
  font-size: 17px;
  font-weight: 500;
  text-align: center;
  margin: 0;
  padding: 0;
  line-height: 1.5;
  letter-spacing: 0.2px;
}

@media (prefers-color-scheme: dark) {
  .loading-text { color: #e2e8f0; }
}

/* ============================================
   MEDIA QUERIES
   ============================================ */
@media (min-width: 640px) {
  body { padding: 0; }
  .captcha-container { padding: 32px; }
  .captcha-disclaimer p { font-size: 14px; }
}