/* === Reset & Base === */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-bg: #fafafa;
  --color-surface: #ffffff;
  --color-text: #1a1a1a;
  --color-text-muted: #6b7280;
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-error: #dc2626;
  --color-error-bg: #fef2f2;
  --color-border: #d1d5db;
  --color-border-focus: #2563eb;
  --color-success: #16a34a;
  --color-progress-bg: #e5e7eb;
  --radius: 8px;
  --max-width: 680px;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  min-height: 100vh;
}

/* === Loading / Entry Page === */
.page-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}

.loading-container {
  text-align: center;
}

.loading-container p {
  margin-top: 1rem;
  color: var(--color-text-muted);
  font-size: 1.125rem;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--color-progress-bg);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto;
}

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

.fallback-container {
  text-align: center;
  margin-top: 2rem;
}

.fallback-container p {
  margin-bottom: 1rem;
  color: var(--color-text-muted);
}

.fallback-container button {
  padding: 0.75rem 1.5rem;
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: 1rem;
  cursor: pointer;
  transition: background 0.2s;
}

.fallback-container button:hover {
  background: var(--color-primary-hover);
}

/* === Confirmation Page === */
.page-confirmation {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}

.confirmation-container {
  text-align: center;
  max-width: 480px;
  padding: 2rem;
}

.confirmation-icon {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--color-success);
  color: #fff;
  font-size: 2rem;
  line-height: 64px;
  text-align: center;
  margin: 0 auto 1.5rem;
}

.confirmation-container h1 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.confirmation-container p {
  color: var(--color-text-muted);
  font-size: 1.125rem;
  margin-bottom: 0.5rem;
}

/* === Brief Page Layout === */
.page-brief {
  display: flex;
  justify-content: center;
  padding: 2rem 1rem 4rem;
}

.brief-container {
  width: 100%;
  max-width: var(--max-width);
}

.brief-header {
  margin-bottom: 2rem;
}

.brief-header h1 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.brief-header p {
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

/* === Form Sections === */
.section {
  display: none;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem;
  animation: fadeIn 0.25s ease;
}

.section.active {
  display: block;
}

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

.section h2 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.section-hint {
  color: var(--color-text-muted);
  font-size: 0.9375rem;
  margin-bottom: 1.5rem;
  font-style: italic;
}

/* === Field Groups === */
.field-group {
  margin-bottom: 1.5rem;
}

.field-group:last-of-type {
  margin-bottom: 0;
}

.field-group label.field-label {
  display: block;
  font-size: 0.9375rem;
  font-weight: 600;
  margin-bottom: 0.375rem;
}

.required {
  color: var(--color-error);
  margin-left: 0.125rem;
}

/* === Text & Email Inputs === */
.field-group input[type="text"],
.field-group input[type="email"],
.field-group select {
  width: 100%;
  padding: 0.625rem 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 0.9375rem;
  font-family: inherit;
  line-height: 1.5;
  background: var(--color-surface);
  transition: border-color 0.15s;
}

.field-group input[type="text"]:focus,
.field-group input[type="email"]:focus,
.field-group select:focus,
.field-group textarea:focus {
  outline: none;
  border-color: var(--color-border-focus);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.field-group textarea {
  width: 100%;
  padding: 0.625rem 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 0.9375rem;
  font-family: inherit;
  line-height: 1.5;
  min-height: 100px;
  resize: vertical;
  background: var(--color-surface);
  transition: border-color 0.15s;
}

/* === Radio & Checkbox Groups === */
.radio-group,
.checkbox-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.radio-group label,
.checkbox-group label {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  padding: 0.625rem 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 0.9375rem;
  transition: border-color 0.15s, background 0.15s;
}

.radio-group label:hover,
.checkbox-group label:hover {
  border-color: var(--color-primary);
  background: rgba(37, 99, 235, 0.02);
}

.radio-group input[type="radio"],
.checkbox-group input[type="checkbox"] {
  margin-top: 0.2rem;
  flex-shrink: 0;
}

.radio-group label.selected {
  border-color: var(--color-primary);
  background: rgba(37, 99, 235, 0.04);
}

/* === Select === */
.field-group select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%236b7280' d='M6 8.825L1.175 4 2.238 2.938 6 6.7 9.763 2.937 10.825 4z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  padding-right: 2rem;
}

/* === Textarea Analysis Indicator === */
.field-analysis {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  margin-top: 0.375rem;
  font-size: 0.75rem;
  color: var(--color-text-muted);
  opacity: 0;
  transition: opacity 0.2s;
}

.field-analysis.visible {
  opacity: 1;
}

.field-analysis.done {
  color: var(--color-success);
}

.field-analysis.nudge {
  color: var(--color-primary);
}

.field-analysis .analysis-spinner {
  width: 12px;
  height: 12px;
  border: 1.5px solid var(--color-progress-bg);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.field-analysis .analysis-check,
.field-analysis .analysis-nudge {
  display: none;
}

.field-analysis.done .analysis-spinner,
.field-analysis.nudge .analysis-spinner {
  display: none;
}

.field-analysis.done .analysis-check {
  display: inline;
}

.field-analysis.nudge .analysis-nudge {
  display: inline;
}

/* === Analysis Overlay === */
.analysis-overlay {
  position: fixed;
  inset: 0;
  background: rgba(250, 250, 250, 0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s;
}

.analysis-overlay.visible {
  opacity: 1;
  pointer-events: all;
}

.analysis-overlay-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}

.analysis-overlay-content .analysis-spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--color-progress-bg);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.analysis-overlay-label {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
}

/* === Error States === */
.field-error {
  display: block;
  color: var(--color-error);
  font-size: 0.8125rem;
  margin-top: 0.25rem;
}

.field-group.has-error input,
.field-group.has-error textarea,
.field-group.has-error select {
  border-color: var(--color-error);
}

.field-group.has-error .radio-group label,
.field-group.has-error .checkbox-group label {
  border-color: var(--color-error);
}

/* === Submission Error === */
.submit-error {
  display: none;
  background: var(--color-error-bg);
  color: var(--color-error);
  border: 1px solid var(--color-error);
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  font-size: 0.875rem;
  margin-bottom: 1rem;
}

.submit-error.visible {
  display: block;
}

/* === Navigation Buttons === */
.form-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
}

.btn {
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius);
  font-size: 0.9375rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: background 0.2s, opacity 0.2s;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-prev {
  background: transparent;
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
}

.btn-prev:hover:not(:disabled) {
  background: var(--color-bg);
}

.btn-next,
.btn-submit {
  background: var(--color-primary);
  color: #fff;
}

.btn-next:hover:not(:disabled),
.btn-submit:hover:not(:disabled) {
  background: var(--color-primary-hover);
}

/* === Turnstile Widget === */
.turnstile-wrapper {
  margin-bottom: 1.5rem;
}

/* === Placeholder for hidden fields === */
input[name="bot-field"] {
  position: absolute;
  left: -9999px;
}

/* === Responsive === */
@media (max-width: 640px) {
  .page-brief {
    padding: 1rem 0.75rem 3rem;
  }

  .section {
    padding: 1.25rem;
  }

  .section h2 {
    font-size: 1.125rem;
  }

  .form-nav {
    gap: 0.75rem;
  }

  .btn {
    padding: 0.625rem 1rem;
    font-size: 0.875rem;
  }

  .brief-header h1 {
    font-size: 1.25rem;
  }
}

@media (max-width: 380px) {
  .form-nav {
    flex-direction: column;
  }

  .btn {
    width: 100%;
    text-align: center;
  }
}