:root {
  --color-teal: #80BDBB;
  --color-teal-dark: #5fa8a5;
  --color-teal-light: #e8f4f3;
  --color-navy: #24243E;
  --color-navy-light: #3a3a5c;
  --color-bg: #f7f9fa;
  --color-white: #ffffff;
  --color-border: #dde3e6;
  --color-text: #24243E;
  --color-text-muted: #5c5c7a;
  --color-error: #c0392b;
  --color-success: #27ae60;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 2px 12px rgba(36, 36, 62, 0.08);
  --shadow-lg: 0 8px 32px rgba(36, 36, 62, 0.12);
  --max-width: 800px;
  --font: 'Open Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --transition: 0.2s ease;
}

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

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

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

/* Header */
.site-header {
  background: var(--color-white);
  border-bottom: 3px solid var(--color-teal);
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.logo {
  width: 56px;
  height: 56px;
  object-fit: contain;
  flex-shrink: 0;
}

.header-text h1 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-navy);
  line-height: 1.3;
}

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

.header-affiliation {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-teal);
  line-height: 1.3;
}

/* Main */
.container {
  flex: 1;
  max-width: var(--max-width);
  width: 100%;
  margin: 0 auto;
  padding: 2rem 1.5rem 3rem;
}

.screen {
  display: none;
  animation: fadeIn 0.3s ease;
}

.screen.active {
  display: block;
}

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

/* Cards */
.card {
  background: var(--color-white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 2rem;
}

.welcome-card h2,
.success-card h2 {
  font-size: 1.5rem;
  color: var(--color-navy);
  margin-bottom: 0.75rem;
}

.welcome-text {
  color: var(--color-text-muted);
  margin-bottom: 1.5rem;
}

/* Forms */
.patient-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-group label {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--color-navy);
}

.required {
  color: var(--color-teal-dark);
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="password"],
.form-group input[type="date"],
.form-group input[type="number"] {
  padding: 0.75rem 1rem;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: 1rem;
  color: var(--color-text);
  transition: border-color var(--transition), box-shadow var(--transition);
  background: var(--color-white);
}

.form-group input:focus {
  outline: none;
  border-color: var(--color-teal);
  box-shadow: 0 0 0 3px var(--color-teal-light);
}

.form-group input.error {
  border-color: var(--color-error);
}

.code-error {
  color: var(--color-error);
  font-size: 0.9rem;
  margin-top: 1rem;
  text-align: center;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.5rem;
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition), opacity var(--transition);
}

.btn[hidden] {
  display: none;
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn:not(:disabled):hover {
  transform: translateY(-1px);
}

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

.btn-primary:not(:disabled):hover {
  background: var(--color-teal-dark);
}

.btn-secondary {
  background: transparent;
  color: var(--color-navy);
  border: 2px solid var(--color-border);
}

.btn-secondary:not(:disabled):hover {
  border-color: var(--color-teal);
  color: var(--color-teal-dark);
}

.btn-lg {
  padding: 0.9rem 2rem;
  font-size: 1rem;
}

.form-actions {
  display: flex;
  gap: 1rem;
  justify-content: flex-end;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
}

/* Progress */
.progress-bar-wrapper {
  margin-bottom: 1.5rem;
}

.progress-info {
  display: flex;
  justify-content: space-between;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
}

.progress-bar {
  height: 8px;
  background: var(--color-border);
  border-radius: 99px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-teal), var(--color-teal-dark));
  border-radius: 99px;
  transition: width 0.4s ease;
  width: 0%;
}

.questionnaire-dots {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.75rem;
  justify-content: center;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-border);
  transition: background var(--transition), transform var(--transition);
}

.dot.active {
  background: var(--color-teal);
  transform: scale(1.2);
}

.dot.completed {
  background: var(--color-teal-dark);
}

/* Questionnaire */
.questionnaire-header {
  margin-bottom: 1.5rem;
  padding-bottom: 1.25rem;
  border-bottom: 2px solid var(--color-teal-light);
}

.questionnaire-badge {
  display: inline-block;
  background: var(--color-teal-light);
  color: var(--color-teal-dark);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 0.25rem 0.75rem;
  border-radius: 99px;
  margin-bottom: 0.75rem;
}

.questionnaire-header h2 {
  font-size: 1.35rem;
  color: var(--color-navy);
  margin-bottom: 0.5rem;
}

.instructions {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  line-height: 1.65;
}

.section-intro {
  background: var(--color-teal-light);
  border-left: 4px solid var(--color-teal);
  padding: 0.875rem 1rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 1.25rem 0 0.75rem;
  font-size: 0.9rem;
  color: var(--color-navy);
  font-weight: 500;
}

/* Questions */
.question-block {
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--color-border);
}

.question-block:last-child {
  border-bottom: none;
}

.question-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: var(--color-navy);
  color: var(--color-white);
  border-radius: 50%;
  font-size: 0.8rem;
  font-weight: 700;
  margin-right: 0.5rem;
  flex-shrink: 0;
}

.question-text {
  font-weight: 500;
  color: var(--color-navy);
  margin-bottom: 0.875rem;
  display: flex;
  align-items: flex-start;
  gap: 0.25rem;
}

/* Radio options */
.options-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.option-btn {
  position: relative;
}

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

.option-btn label {
  display: block;
  padding: 0.6rem 1rem;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  text-align: center;
  min-width: 80px;
  user-select: none;
}

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

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

.option-btn label:hover {
  border-color: var(--color-teal);
}

/* Likert scale (horizontal) */
.likert-scale {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(90px, 1fr));
  gap: 0.5rem;
}

.likert-scale .option-btn label {
  min-width: unset;
  font-size: 0.8rem;
  padding: 0.55rem 0.5rem;
}

/* Numeric 0-10 scale */
.numeric-scale {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  align-items: center;
}

.numeric-scale .option-btn label {
  min-width: 44px;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  border-radius: 50%;
  font-weight: 700;
}

.scale-labels {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-top: 0.5rem;
  padding: 0 0.25rem;
}

/* True/False + Distress */
.tf-distress-block .tf-row {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.distress-row {
  padding-left: 1rem;
  border-left: 3px solid var(--color-teal-light);
  margin-top: 0.5rem;
}

.distress-row.hidden {
  display: none;
}

.distress-label {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
  font-weight: 600;
}

/* Number input */
.number-input-group {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.number-input-group input {
  width: 80px;
  padding: 0.6rem 0.75rem;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: 1.1rem;
  font-weight: 600;
  text-align: center;
}

.number-input-group input:focus {
  outline: none;
  border-color: var(--color-teal);
  box-shadow: 0 0 0 3px var(--color-teal-light);
}

.number-unit {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

/* Validation */
.question-block.invalid {
  background: #fff5f5;
  margin: 0 -1rem;
  padding: 1.25rem 1rem;
  border-radius: var(--radius-sm);
  border-bottom-color: transparent;
}

.validation-msg {
  color: var(--color-error);
  font-size: 0.8rem;
  margin-top: 0.5rem;
  display: none;
}

.question-block.invalid .validation-msg {
  display: block;
}

/* Review */
.review-summary {
  background: var(--color-bg);
  border-radius: var(--radius-sm);
  padding: 1.25rem;
  margin: 1.25rem 0;
}

.review-patient {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-navy);
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--color-border);
}

.review-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem 0;
  font-size: 0.9rem;
}

.review-item .status {
  font-weight: 600;
  color: var(--color-success);
}

/* GDPR consent */
.patient-form .gdpr-consent {
  margin-top: 0;
}

.gdpr-consent {
  margin-top: 1.25rem;
  padding: 1rem 1.25rem;
  background: var(--color-teal-light);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
}

.gdpr-consent.invalid {
  border-color: var(--color-error);
  background: #fff5f5;
}

.gdpr-consent-label {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 0.9rem;
  line-height: 1.55;
  color: var(--color-navy);
  cursor: pointer;
}

.gdpr-consent-label input[type="checkbox"] {
  width: 18px;
  height: 18px;
  margin-top: 0.15rem;
  flex-shrink: 0;
  accent-color: var(--color-teal-dark);
  cursor: pointer;
}

.gdpr-link {
  background: none;
  border: none;
  padding: 0;
  font-family: var(--font);
  font-size: inherit;
  font-weight: 600;
  color: var(--color-teal-dark);
  text-decoration: underline;
  cursor: pointer;
}

.gdpr-link:hover {
  color: var(--color-navy);
}

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(36, 36, 62, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1500;
  padding: 1.5rem;
}

.modal-overlay[hidden] {
  display: none;
}

.modal-card {
  background: var(--color-white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 640px;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  animation: fadeIn 0.25s ease;
}

.modal-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.5rem 1.5rem 0;
}

.modal-header h2 {
  font-size: 1.2rem;
  color: var(--color-navy);
  line-height: 1.35;
}

.modal-close {
  background: none;
  border: none;
  font-size: 1.75rem;
  line-height: 1;
  color: var(--color-text-muted);
  cursor: pointer;
  padding: 0 0.25rem;
  flex-shrink: 0;
}

.modal-close:hover {
  color: var(--color-navy);
}

.modal-body {
  padding: 1.25rem 1.5rem;
  overflow-y: auto;
  font-size: 0.9rem;
  color: var(--color-text);
  line-height: 1.65;
}

.modal-body h3 {
  font-size: 0.95rem;
  color: var(--color-navy);
  margin: 1.25rem 0 0.4rem;
}

.modal-body h3:first-of-type {
  margin-top: 0;
}

.modal-body p {
  margin-bottom: 0.5rem;
}

.modal-body a {
  color: var(--color-teal-dark);
}

.modal-footer {
  padding: 1rem 1.5rem 1.5rem;
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: flex-end;
}

/* Success */
.success-card {
  text-align: center;
  padding: 3rem 2rem;
}

.success-icon {
  width: 72px;
  height: 72px;
  background: var(--color-teal);
  color: var(--color-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  margin: 0 auto 1.25rem;
}

.success-detail {
  color: var(--color-text-muted);
  margin-top: 0.5rem;
  font-size: 0.9rem;
}

/* Footer */
.site-footer {
  background: var(--color-navy);
  color: rgba(255, 255, 255, 0.75);
  padding: 1.25rem 1.5rem;
  text-align: center;
  font-size: 0.85rem;
}

.footer-inner p + p {
  margin-top: 0.25rem;
}

.site-footer a {
  color: var(--color-teal);
  text-decoration: none;
}

.site-footer a:hover {
  text-decoration: underline;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 0.4rem 1.1rem;
  margin-top: 0.45rem;
}

.footer-links a {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.footer-links svg {
  width: 15px;
  height: 15px;
  flex-shrink: 0;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--color-navy);
  color: var(--color-white);
  padding: 0.875rem 1.5rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  z-index: 1000;
  transition: transform 0.3s ease;
  pointer-events: none;
  max-width: 90vw;
  text-align: center;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
}

.toast.error {
  background: var(--color-error);
}

/* Loading */
.loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(36, 36, 62, 0.6);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  color: var(--color-white);
  gap: 1rem;
}

.loading-overlay[hidden] {
  display: none;
}

.spinner {
  width: 48px;
  height: 48px;
  border: 4px solid rgba(255, 255, 255, 0.3);
  border-top-color: var(--color-teal);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* Responsive */
@media (max-width: 600px) {
  .header-inner {
    padding: 0.875rem 1rem;
  }

  .header-text h1 {
    font-size: 1.05rem;
  }

  .container {
    padding: 1.25rem 1rem 2rem;
  }

  .card {
    padding: 1.25rem;
  }

  .form-actions {
    flex-direction: column-reverse;
  }

  .form-actions .btn {
    width: 100%;
  }

  .likert-scale {
    grid-template-columns: repeat(2, 1fr);
  }

  .options-row {
    flex-direction: column;
  }

  .option-btn label {
    width: 100%;
  }

  .numeric-scale {
    justify-content: center;
  }
}