:root {
  --engie-blue: #00aaff;
  --engie-blue-dark: #0088cc;
  --engie-blue-light: #33bbff;
  --engie-navy: #003366;
  --text-primary: #1a1a1a;
  --text-secondary: #666666;
  --text-muted: #999999;
  --border-color: #e0e0e0;
  --border-focus: #00aaff;
  --bg-page: #f5f7fa;
  --bg-card: #ffffff;
  --success: #2e7d32;
  --success-bg: #e8f5e9;
  --error: #c62828;
  --error-bg: #ffebee;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.08);
  --font-family:
    "Source Sans 3", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

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

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.5;
  color: var(--text-primary);
  background: var(--bg-page);
  display: flex;
  flex-direction: column;
}

/* Header */
.site-header {
  background: linear-gradient(
    135deg,
    var(--engie-blue) 0%,
    var(--engie-blue-dark) 100%
  );
  color: #fff;
  padding: 1.5rem 1rem 5rem;
}

.header-inner {
  max-width: 960px;
  margin: 0 auto;
}

.header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 2rem;
  gap: 1rem;
  flex-wrap: wrap;
}

.logo {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  padding: 0.625rem 1rem;
  border-radius: var(--radius-sm);
}

.logo-image {
  display: block;
  height: 28px;
  width: auto;
}

.page-title {
  margin: 0 0 0.5rem;
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 600;
  line-height: 1.2;
}

.page-subtitle {
  margin: 0;
  font-size: 1rem;
  opacity: 0.9;
}

/* Stepper */
.stepper {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.stepper-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.15rem;
  opacity: 0.6;
  transition: opacity 0.2s;
}

.stepper-item.is-active,
.stepper-item.is-complete {
  opacity: 1;
}

.stepper-number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.25);
  font-size: 0.875rem;
  font-weight: 600;
  transition:
    background 0.2s,
    transform 0.2s;
}

.stepper-item.is-active .stepper-number {
  background: #fff;
  color: var(--engie-blue);
  transform: scale(1.1);
}

.stepper-item.is-complete .stepper-number {
  background: rgba(255, 255, 255, 0.9);
  color: var(--engie-blue-dark);
}

.stepper-label {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  display: none;
}

.stepper-chevron {
  font-size: 1.25rem;
  opacity: 0.5;
  line-height: 1;
}

@media (min-width: 640px) {
  .stepper-label {
    display: block;
  }
}

/* Main content */
.main-content {
  flex: 1;
  max-width: 960px;
  width: 100%;
  margin: -3.5rem auto 2rem;
  padding: 0 1rem;
}

.form-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 2rem;
}

.form-heading {
  margin: 0 0 1.75rem;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* Form elements */
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

@media (max-width: 520px) {
  .form-row {
    grid-template-columns: 1fr;
  }
}

.form-group {
  margin-bottom: 1.25rem;
}

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

.required {
  color: var(--error);
}

input[type="text"],
input[type="tel"],
input[type="password"],
select {
  width: 100%;
  padding: 0.875rem 1rem;
  font-family: inherit;
  font-size: 1rem;
  color: var(--text-primary);
  background: #fff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  transition:
    border-color 0.2s,
    box-shadow 0.2s;
}

select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%23666' d='M1.41 0L6 4.58 10.59 0 12 1.41l-6 6-6-6z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  padding-right: 2.5rem;
  cursor: pointer;
}

input[type="text"]:focus,
input[type="tel"]:focus,
input[type="password"]:focus,
select:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(0, 170, 255, 0.15);
}

input.is-invalid,
select.is-invalid {
  border-color: var(--error);
}

input.is-invalid:focus,
select.is-invalid:focus {
  box-shadow: 0 0 0 3px rgba(198, 40, 40, 0.15);
}

.field-error {
  margin: 0.375rem 0 0;
  font-size: 0.875rem;
  color: var(--error);
}

.form-hint {
  margin: 0.5rem 0 0;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* Validation feedback */
.validation-feedback {
  margin: 0.5rem 0 1rem;
  padding: 0.875rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
}

.validation-feedback.is-loading {
  background: #f0f8ff;
  color: var(--engie-blue-dark);
}

.validation-feedback.is-success {
  background: var(--success-bg);
  color: var(--success);
}

.validation-feedback.is-error {
  background: var(--error-bg);
  color: var(--error);
}

/* Summary */
.summary-list {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: 1rem;
}

.summary-item {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
}

.summary-item:last-child {
  border-bottom: none;
}

.summary-label {
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--text-secondary);
  flex-shrink: 0;
}

.summary-value {
  text-align: right;
  font-size: 0.9375rem;
}

.summary-value small {
  color: var(--text-secondary);
}

/* Alerts */
.alert {
  padding: 1rem 1.25rem;
  border-radius: var(--radius-sm);
  margin-bottom: 1.5rem;
  font-size: 0.9375rem;
}

.alert-success {
  background: var(--success-bg);
  color: var(--success);
  border: 1px solid #a5d6a7;
}

.alert-error {
  background: var(--error-bg);
  color: var(--error);
  border: 1px solid #ef9a9a;
}

/* Buttons */
.form-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-color);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 120px;
  padding: 0.875rem 1.75rem;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition:
    background 0.2s,
    transform 0.1s,
    box-shadow 0.2s;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: var(--engie-blue);
  color: #fff;
}

.btn-primary:hover {
  background: var(--engie-blue-dark);
  box-shadow: 0 2px 8px rgba(0, 170, 255, 0.35);
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.btn-secondary {
  background: #fff;
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: #f5f5f5;
  border-color: #ccc;
}

/* Footer */
.site-footer {
  padding: 1.5rem 1rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.875rem;
  border-top: 1px solid var(--border-color);
  background: #fff;
}

.site-footer p {
  margin: 0 0 0.5rem;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
}

.footer-links a:hover {
  color: var(--engie-blue);
  text-decoration: underline;
}