/* =============================================
   BRIEF FORM — Humberto Cabana
   Design: Dark theme, multi-step, Typeform-style
   ============================================= */

:root {
  --bg: #09090b;
  --bg-card: #18181b;
  --bg-card-hover: #27272a;
  --bg-input: #1c1c21;
  --border: #2e2e35;
  --border-focus: #6366f1;
  --text: #fafafa;
  --text-secondary: #a1a1aa;
  --text-muted: #71717a;
  --accent: #6366f1;
  --accent-hover: #818cf8;
  --accent-glow: rgba(99, 102, 241, 0.25);
  --success: #22c55e;
  --danger: #ef4444;
  --radius: 12px;
  --radius-sm: 8px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font: 'Poppins', system-ui, -apple-system, sans-serif;
  --font-heading: 'Space Grotesk', 'Poppins', system-ui, sans-serif;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  min-height: 100dvh;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* =============================================
   PROGRESS BAR
   ============================================= */

.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--border);
  z-index: 100;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-hover));
  width: 0%;
  transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 0 12px var(--accent-glow);
}

/* =============================================
   NAVIGATION
   ============================================= */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem 2rem;
  z-index: 50;
}

.nav-brand {
  display: flex;
  align-items: center;
}

.nav-logo {
  height: 40px;
  width: auto;
}

.nav-steps {
  font-size: 0.875rem;
  color: var(--text-muted);
  font-weight: 500;
  font-variant-numeric: tabular-nums;
}

#currentStep {
  color: var(--text);
}

/* =============================================
   STEPS
   ============================================= */

form {
  position: relative;
  width: 100%;
  height: 100vh;
  height: 100dvh;
}

.step {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 5rem 2rem 2rem;
  opacity: 0;
  visibility: hidden;
  transform: translateY(30px);
  transition: opacity 0.5s ease, transform 0.5s ease, visibility 0s 0.5s;
  overflow-y: auto;
}

.step.active {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  transition: opacity 0.5s ease, transform 0.5s ease, visibility 0s 0s;
  z-index: 10;
}

.step.exit-up {
  opacity: 0;
  transform: translateY(-30px);
}

.step-content {
  width: 100%;
  max-width: 640px;
  margin: auto;
}

.step-icon {
  font-size: 3rem;
  margin-bottom: 1.5rem;
  display: block;
}

.step-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.75rem;
  padding: 0.25rem 0.75rem;
  background: rgba(99, 102, 241, 0.1);
  border-radius: 100px;
}

h1 {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--text) 0%, var(--text-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

h2 {
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 4vw, 2.25rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.25;
  margin-bottom: 0.5rem;
}

.step-subtitle {
  color: var(--text-secondary);
  font-size: 1.0625rem;
  margin-bottom: 2rem;
  line-height: 1.6;
}

.step-detail {
  color: var(--text-muted);
  font-size: 0.9375rem;
  margin-bottom: 2.5rem;
}

/* =============================================
   FORM ELEMENTS
   ============================================= */

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

input[type="text"],
input[type="email"],
input[type="url"],
input[type="tel"],
input[type="number"],
textarea {
  width: 100%;
  padding: 0.875rem 1rem;
  font-family: var(--font);
  font-size: 1rem;
  color: var(--text);
  background: var(--bg-input);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}

input:focus,
textarea:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

input::placeholder,
textarea::placeholder {
  color: var(--text-muted);
}

textarea {
  resize: vertical;
  min-height: 80px;
}

/* =============================================
   RADIO CARDS
   ============================================= */

.radio-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.radio-group-vertical {
  flex-direction: column;
}

.radio-card {
  cursor: pointer;
  flex: 1;
  min-width: 120px;
}

.radio-group-vertical .radio-card {
  min-width: 100%;
}

.radio-card input {
  display: none;
}

.radio-card-content {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  padding: 0.875rem 1.125rem;
  background: var(--bg-card);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  font-weight: 500;
  transition: all var(--transition);
  text-align: center;
  justify-content: center;
}

.radio-group-vertical .radio-card-content {
  justify-content: flex-start;
  text-align: left;
}

.radio-card:hover .radio-card-content {
  border-color: var(--accent);
  background: var(--bg-card-hover);
}

.radio-card input:checked + .radio-card-content {
  border-color: var(--accent);
  background: rgba(99, 102, 241, 0.1);
  box-shadow: 0 0 0 1px var(--accent);
}

.radio-icon {
  font-size: 1.25rem;
}

.radio-desc {
  display: block;
  font-size: 0.8125rem;
  color: var(--text-muted);
  font-weight: 400;
  margin-top: 0.125rem;
}

/* =============================================
   CHECKBOX GRID
   ============================================= */

.checkbox-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 0.75rem;
}

.checkbox-grid-compact {
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
}

.check-card {
  cursor: pointer;
}

.check-card input {
  display: none;
}

.check-card-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.375rem;
  padding: 1rem;
  background: var(--bg-card);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  text-align: center;
}

.check-icon {
  font-size: 1.5rem;
}

.check-label {
  font-size: 0.875rem;
  font-weight: 600;
}

.check-desc {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.check-card:hover .check-card-content {
  border-color: var(--accent);
  background: var(--bg-card-hover);
}

.check-card input:checked + .check-card-content {
  border-color: var(--accent);
  background: rgba(99, 102, 241, 0.1);
  box-shadow: 0 0 0 1px var(--accent);
}

.checkbox-grid-compact .check-card-content {
  flex-direction: row;
  padding: 0.75rem 1rem;
  gap: 0.5rem;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-family: var(--font);
  font-size: 0.9375rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}

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

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background: transparent;
  color: var(--text-muted);
  border: 1.5px solid var(--border);
}

.btn-secondary:hover {
  color: var(--text);
  border-color: var(--text-muted);
}

.btn-lg {
  padding: 1rem 2rem;
  font-size: 1.0625rem;
}

.btn-submit {
  background: linear-gradient(135deg, var(--accent), #8b5cf6);
  padding: 1rem 2.5rem;
  font-size: 1.0625rem;
}

.btn-submit:hover {
  box-shadow: 0 4px 24px var(--accent-glow);
  transform: translateY(-1px);
}

.btn-arrow {
  font-size: 1.125rem;
  transition: transform 0.2s ease;
}

.btn:hover .btn-arrow {
  transform: translateX(3px);
}

.btn-secondary:hover .btn-arrow {
  transform: translateX(-3px);
}

.step-nav {
  display: flex;
  gap: 0.75rem;
  margin-top: 2.5rem;
}

/* =============================================
   HINT
   ============================================= */

.hint {
  display: block;
  margin-top: 1.25rem;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

kbd {
  display: inline-block;
  padding: 0.125rem 0.5rem;
  font-family: var(--font);
  font-size: 0.75rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-secondary);
}

/* =============================================
   PLATFORM SECTIONS (Step 6)
   ============================================= */

.platform-section {
  margin-bottom: 2rem;
  padding: 1.25rem 1.5rem;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.platform-section:last-of-type {
  margin-bottom: 1.5rem;
}

.platform-title {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
  color: var(--text);
}

h3 {
  font-family: var(--font-heading);
}

/* =============================================
   INFO BOX
   ============================================= */

.info-box {
  display: flex;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  background: rgba(99, 102, 241, 0.06);
  border: 1px solid rgba(99, 102, 241, 0.15);
  border-radius: var(--radius-sm);
  margin-bottom: 2rem;
  align-items: flex-start;
}

.info-box p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.info-box ol {
  margin-top: 0.5rem;
  padding-left: 1.25rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

.info-icon {
  font-size: 1.25rem;
  flex-shrink: 0;
  margin-top: 0.125rem;
}

/* =============================================
   SUCCESS SCREEN
   ============================================= */

.success-content {
  text-align: center;
}

.success-check {
  width: 80px;
  height: 80px;
  margin: 0 auto 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  color: var(--success);
  background: rgba(34, 197, 94, 0.1);
  border: 2px solid rgba(34, 197, 94, 0.3);
  border-radius: 50%;
  animation: scaleIn 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes scaleIn {
  from { transform: scale(0); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

.success-content .info-box {
  text-align: left;
  max-width: 420px;
  margin: 2rem auto;
}

.success-footer {
  margin-top: 2rem;
  color: var(--text-muted);
  font-style: italic;
  font-size: 0.9375rem;
}

/* =============================================
   LOADING OVERLAY
   ============================================= */

.loading-overlay {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  background: rgba(9, 9, 11, 0.9);
  backdrop-filter: blur(8px);
  z-index: 200;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0s 0.3s;
}

.loading-overlay.visible {
  opacity: 1;
  visibility: visible;
  transition: opacity 0.3s ease, visibility 0s 0s;
}

.loading-overlay p {
  color: var(--text-secondary);
  font-size: 0.9375rem;
}

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

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

/* =============================================
   VALIDATION
   ============================================= */

.form-group.error input,
.form-group.error textarea {
  border-color: var(--danger);
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.15);
}

.form-group .error-msg {
  display: none;
  font-size: 0.8125rem;
  color: var(--danger);
  margin-top: 0.375rem;
}

.form-group.error .error-msg {
  display: block;
}

/* =============================================
   SHAKE ANIMATION
   ============================================= */

.shake {
  animation: shake 0.4s ease;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-8px); }
  40% { transform: translateX(8px); }
  60% { transform: translateX(-4px); }
  80% { transform: translateX(4px); }
}

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

@media (max-width: 640px) {
  .nav {
    padding: 1rem 1.25rem;
  }

  .step {
    padding: 4.5rem 1.25rem 1.5rem;
    align-items: flex-start;
  }

  .step-content {
    margin-top: 1rem;
  }

  .radio-group {
    flex-direction: column;
  }

  .radio-card {
    min-width: 100%;
  }

  .checkbox-grid {
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  }

  .step-nav {
    flex-direction: column-reverse;
  }

  .step-nav .btn {
    width: 100%;
    justify-content: center;
  }

  .btn-lg {
    width: 100%;
    justify-content: center;
  }
}

/* =============================================
   SCROLLBAR (for long steps)
   ============================================= */

.step::-webkit-scrollbar {
  width: 4px;
}

.step::-webkit-scrollbar-track {
  background: transparent;
}

.step::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}

/* =============================================
   BACKGROUND GLOW EFFECT
   ============================================= */

body::before {
  content: '';
  position: fixed;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 30% 30%, rgba(99, 102, 241, 0.04), transparent 50%),
              radial-gradient(circle at 70% 70%, rgba(139, 92, 246, 0.03), transparent 50%);
  pointer-events: none;
  z-index: -1;
}

/* =============================================
   PREMIUM TOUCHES
   ============================================= */

/* Subtle glow on focused input */
input:focus,
textarea:focus {
  background: rgba(99, 102, 241, 0.03);
}

/* Card hover micro-glow */
.check-card input:checked + .check-card-content,
.radio-card input:checked + .radio-card-content {
  box-shadow: 0 0 0 1px var(--accent), 0 2px 16px rgba(99, 102, 241, 0.12);
}

/* Animated gradient on submit button */
.btn-submit {
  background-size: 200% 200%;
  animation: gradientShift 3s ease infinite;
}

@keyframes gradientShift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

/* Step label pulse on active */
.step.active .step-label {
  animation: labelFade 0.6s ease;
}

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

/* Nav logo glow */
.nav-logo {
  filter: drop-shadow(0 0 12px var(--accent-glow));
}