:root {
  --color-primary: #4a6fd4;
  --color-primary-dark: #3358c4;
  --color-primary-soft: #e8f0fe;
  --color-primary-bg: #f0f5ff;

  --color-text: #0d1f3c;
  --color-text-muted: #4a5568;
  --color-text-light: #6b7280;

  --color-white: #ffffff;
  --color-border: #d1daf0;
  --color-border-soft: rgba(74, 111, 212, 0.12);

  --color-success-bg: #e6ffed;
  --color-success-border: #38a169;
  --color-success-text: #276749;

  --color-warning-bg: #fff8e1;
  --color-warning-border: #f6c90e;
  --color-warning-text: #7a5f00;

  --color-danger-bg: #fff0f0;
  --color-danger-text: #e53e3e;

  --shadow-sm: 0 4px 20px rgba(10, 22, 40, 0.06);
  --shadow-md: 0 8px 25px rgba(74, 111, 212, 0.35);

  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 10px;
  --radius-xl: 12px;
  --radius-2xl: 16px;

  --space-xs: 0.4rem;
  --space-sm: 0.5rem;
  --space-md: 0.8rem;
  --space-lg: 1rem;
  --space-xl: 1.2rem;
  --space-2xl: 1.5rem;
  --space-3xl: 2rem;

  --font-body: 'DM Sans', sans-serif;
  --font-heading: 'Playfair Display', serif;

  --transition-fast: 0.2s ease;
  --max-width-form: 820px;
}

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

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

body {
  margin: 0;
  font-family: var(--font-body);
  background: var(--color-primary-bg);
  color: var(--color-text);
  line-height: 1.5;
}

img {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
}

button,
input,
select,
textarea {
  font: inherit;
}

/* Accessibility */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Header */
header {
  background: var(--color-primary);
  padding: 1.2rem 5vw;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.header-logo {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  text-decoration: none;
}

.header-logo img {
  width: 44px;
  height: 44px;
  object-fit: cover;
  border-radius: 50%;
  background: var(--color-white);
  padding: 2px;
}

.header-logo span {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: 900;
  color: var(--color-white);
}

.header-logo span em {
  color: #c8d8ff;
  font-style: normal;
}

.header-phone {
  color: var(--color-white);
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
}

.header-phone:hover,
.header-phone:focus-visible {
  text-decoration: underline;
}

/* Hero */
.hero {
  background: var(--hero-color, var(--color-primary));
  padding: 2rem 5vw 3rem;
  text-align: center;
}

.back-link a {
  color: rgba(255, 255, 255, 0.75);
  text-decoration: none;
  font-size: 0.88rem;
  transition: color var(--transition-fast);
}

.back-link a:hover,
.back-link a:focus-visible {
  color: var(--color-white);
}

.hero-icon {
  font-size: 3rem;
  margin: 0.8rem 0 0.5rem;
}

.hero h1 {
  margin: 0 0 0.7rem;
  font-family: var(--font-heading);
  font-size: clamp(1.6rem, 3.5vw, 2.2rem);
  color: var(--color-white);
}

.hero p {
  margin: 0 auto;
  max-width: 520px;
  color: rgba(255, 255, 255, 0.8);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* Main container */
.form-container {
  max-width: var(--max-width-form);
  margin: 2rem auto;
  padding: 0 1.5rem 4rem;
}

/* Sections */
.form-section {
  background: var(--color-white);
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-sm);
  padding: var(--space-3xl);
  margin-bottom: var(--space-2xl);
}

.form-section-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0 0 1.4rem;
  padding-bottom: 0.8rem;
  border-bottom: 2px solid var(--color-primary-soft);
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
}

/* Layout utilities */
.form-row,
.form-row-3 {
  display: grid;
  gap: 1rem;
  margin-bottom: 1rem;
}

.form-row {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.form-row-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.form-group {
  margin-bottom: 1rem;
}

/* Labels */
label {
  display: block;
  margin-bottom: 0.4rem;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-text);
}

.req {
  color: var(--color-danger-text);
}

/* Fields */
input,
select,
textarea {
  width: 100%;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  background: #fafbff;
  color: var(--color-text);
  font-size: 0.95rem;
  transition:
    border-color var(--transition-fast),
    box-shadow var(--transition-fast),
    background var(--transition-fast);
}

input::placeholder,
textarea::placeholder {
  color: #8a94a6;
}

input:hover,
select:hover,
textarea:hover {
  border-color: var(--color-primary);
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(74, 111, 212, 0.12);
  background: var(--color-white);
  outline: none;
}

input:disabled,
select:disabled,
textarea:disabled {
  opacity: 0.65;
  cursor: not-allowed;
  background: #f3f4f6;
}

textarea {
  min-height: 90px;
  resize: vertical;
}

/* Checkbox group */
.checkbox-group {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0.6rem;
  margin-top: 0.4rem;
}

.cb-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
  padding: 0.6rem 0.9rem;
  background: var(--color-primary-bg);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: 0.88rem;
  font-weight: 500;
  text-transform: none;
  letter-spacing: 0;
  transition:
    border-color var(--transition-fast),
    background var(--transition-fast),
    transform var(--transition-fast);
}

.cb-item:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-soft);
}

.cb-item:has(input:focus-visible) {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(74, 111, 212, 0.12);
}

.cb-item input[type="checkbox"] {
  width: 16px;
  height: 16px;
  margin: 0;
  padding: 0;
  accent-color: var(--color-primary);
  flex-shrink: 0;
}

/* Dependents row */
.dep-row {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr auto;
  gap: 0.7rem;
  align-items: end;
  margin-bottom: 0.8rem;
  padding: 1rem;
  background: var(--color-primary-bg);
  border-radius: var(--radius-lg);
}

/* Buttons */
.add-btn,
.remove-btn,
.submit-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition:
    background var(--transition-fast),
    color var(--transition-fast),
    border-color var(--transition-fast),
    transform var(--transition-fast),
    box-shadow var(--transition-fast),
    opacity var(--transition-fast);
  cursor: pointer;
}

.add-btn {
  margin-top: 0.5rem;
  padding: 0.65rem 1.2rem;
  border: 1.5px dashed var(--color-primary);
  border-radius: var(--radius-md);
  background: var(--color-primary-soft);
  color: var(--color-primary);
  font-size: 0.88rem;
  font-weight: 600;
}

.add-btn:hover {
  background: #dbe7ff;
}

.add-btn:active {
  transform: translateY(1px);
}

.add-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.remove-btn {
  padding: 0.5rem 0.7rem;
  border: none;
  border-radius: var(--radius-sm);
  background: var(--color-danger-bg);
  color: var(--color-danger-text);
  font-size: 1rem;
}

.remove-btn:hover {
  filter: brightness(0.97);
}

.remove-btn:active {
  transform: translateY(1px);
}

.submit-section {
  margin-top: 2rem;
  text-align: center;
}

.submit-btn {
  padding: 1.1rem 3rem;
  border: none;
  border-radius: var(--radius-lg);
  background: var(--color-primary);
  color: var(--color-white);
  font-size: 1.05rem;
  font-weight: 700;
}

.submit-btn:hover {
  background: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

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

.submit-btn:disabled {
  opacity: 0.65;
  cursor: not-allowed;
  box-shadow: none;
}

.submit-note {
  margin-top: 0.8rem;
  font-size: 0.8rem;
  color: var(--color-text-light);
}

/* Informational blocks */
.notice-box {
  margin-bottom: 1.5rem;
  padding: 1rem 1.2rem;
  border: 1.5px solid var(--color-warning-border);
  border-radius: var(--radius-lg);
  background: var(--color-warning-bg);
  color: var(--color-warning-text);
  font-size: 0.88rem;
  line-height: 1.6;
}

.consent-box {
  margin-bottom: 1rem;
  padding: 1.2rem;
  border: 1.5px solid var(--color-primary);
  border-radius: var(--radius-lg);
  background: var(--color-primary-bg);
  color: var(--color-text);
  font-size: 0.85rem;
  line-height: 1.7;
}

.sub-text {
  margin-bottom: 0.8rem;
  font-size: 0.88rem;
  color: var(--color-text-muted);
}

.divider {
  height: 1px;
  margin: 1.2rem 0;
  background: var(--color-primary-soft);
}

/* Success message */
.success-msg {
  display: none;
  margin-top: 1rem;
  padding: 2rem;
  border: 2px solid var(--color-success-border);
  border-radius: var(--radius-xl);
  background: var(--color-success-bg);
  text-align: center;
}

.success-msg h3 {
  margin: 0 0 0.5rem;
  color: var(--color-success-text);
  font-size: 1.3rem;
}

.success-msg p {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

/* ─────────────────────────────────────────
   VALIDACIÓN Y FEEDBACK VISUAL
   ───────────────────────────────────────── */

.field-error {
  border-color: var(--color-danger-text) !important;
  background: var(--color-danger-bg) !important;
}

.field-error:focus {
  border-color: var(--color-danger-text) !important;
  box-shadow: 0 0 0 3px rgba(229, 62, 62, 0.12) !important;
}

.field-valid {
  border-color: #38a169 !important;
  background: var(--color-success-bg) !important;
}

.field-valid:focus {
  border-color: #38a169 !important;
  box-shadow: 0 0 0 3px rgba(56, 161, 105, 0.12) !important;
}

.error-message {
  display: none;
  font-size: 0.75rem;
  color: var(--color-danger-text);
  margin-top: 0.35rem;
  margin-bottom: 0.5rem;
  font-weight: 600;
  animation: slideDownError 0.2s ease-out;
}

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

/* ─────────────────────────────────────────
   PROGRESS BAR
   ───────────────────────────────────────── */

.progress-bar-container {
  margin: 0 0 2.5rem 0;
  padding: 1.2rem;
  background: var(--color-primary-bg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-soft);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 10;
}

.progress-text {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-muted);
  margin-bottom: 0.8rem;
  text-align: center;
}

.progress-text .progress-current,
.progress-text .progress-total {
  color: var(--color-primary);
  font-weight: 700;
}

.progress-bar-track {
  width: 100%;
  height: 8px;
  background: var(--color-border-soft);
  border-radius: 10px;
  overflow: hidden;
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.06);
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary) 0%, #7a93e0 100%);
  border-radius: 10px;
  transition: width 0.4s cubic-bezier(0.4, 0.0, 0.2, 1);
  box-shadow: 0 0 16px rgba(74, 111, 212, 0.5);
  position: relative;
}

.progress-bar-fill::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(90deg, transparent 0%, rgba(255, 255, 255, 0.3) 50%, transparent 100%);
  border-radius: 10px;
  animation: shimmer 2s infinite;
}

@keyframes shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

/* ─────────────────────────────────────────
   ACCESIBILIDAD Y CAMPOS REQUIRED
   ───────────────────────────────────────── */

input[required],
select[required],
textarea[required] {
  border-color: var(--color-primary);
}

input[required]:focus,
select[required]:focus,
textarea[required]:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px rgba(74, 111, 212, 0.15);
}

label .req {
  margin-left: 0.2rem;
  font-weight: 700;
}

/* ─────────────────────────────────────────
   CAMPOS CONDICIONALES CON ARIA
   ───────────────────────────────────────── */

[aria-hidden="true"] {
  display: none !important;
}

div[aria-hidden="false"] {
  animation: slideDown 0.3s ease-out;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ─────────────────────────────────────────
   RESPONSIVE MEDIA QUERIES
   ───────────────────────────────────────── */

/* Responsive */
@media (max-width: 900px) {
  .dep-row {
    grid-template-columns: 1fr 1fr;
  }

  .dep-row>*:first-child {
    grid-column: 1 / -1;
  }
}

@media (max-width: 600px) {
  header {
    flex-direction: column;
    align-items: flex-start;
  }

  .form-container {
    padding: 0 1rem 3rem;
  }

  .form-section {
    padding: 1.4rem;
  }

  .form-row,
  .form-row-3 {
    grid-template-columns: 1fr;
  }

  .dep-row {
    grid-template-columns: 1fr;
  }

  .dep-row>*:first-child {
    grid-column: auto;
  }

  .submit-btn {
    width: 100%;
  }

  .progress-bar-container {
    position: relative;
    margin-bottom: 1.5rem;
    padding: 1rem;
  }

  .progress-text {
    font-size: 0.8rem;
    margin-bottom: 0.6rem;
  }

  .error-message {
    font-size: 0.7rem;
    margin-top: 0.25rem;
  }
}