@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

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

:root {
  --bg:          #0D0C1D;
  --surface:     #14132A;
  --surface-2:   #1E1C3A;
  --border:      #2D2B4E;
  --violet:      #7C3AED;
  --violet-light:#A78BFA;
  --violet-pale: #EDE9FE;
  --text:        #F0EEF8;
  --text-muted:  #9D9BB8;
  --success:     #10B981;
  --error:       #EF4444;
  --radius:      12px;
  --radius-sm:   8px;
  --transition:  0.25s ease;
}

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

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
}

/* ── HEADER ── */
.site-header {
  background: linear-gradient(180deg, #0A0918 0%, var(--bg) 100%);
  border-bottom: 1px solid var(--border);
  padding: 1.25rem 1.5rem;
  text-align: center;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(8px);
}

.site-header .logo {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
}

.logo-mark {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--violet) 0%, var(--violet-light) 100%);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
  color: #fff;
  flex-shrink: 0;
}

.logo-text {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.02em;
}

.header-tagline {
  margin-top: 0.25rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  letter-spacing: 0.01em;
}

/* ── MAIN LAYOUT ── */
main {
  max-width: 680px;
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
}

/* ── INTRO BANNER ── */
.intro-banner {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem 1.75rem;
  margin-bottom: 2rem;
  position: relative;
  overflow: hidden;
}

.intro-banner::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--violet), var(--violet-light));
}

.intro-banner h1 {
  font-size: 1.35rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 0.75rem;
  color: var(--text);
  letter-spacing: -0.02em;
}

.intro-banner h1 span {
  color: var(--violet-light);
}

.intro-banner p {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.intro-banner p:last-child { margin-bottom: 0; }

.trust-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 50px;
  padding: 0.3rem 0.75rem;
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 500;
}

.badge svg { color: var(--violet-light); flex-shrink: 0; }

/* ── FORM CARD ── */
.form-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

/* ── PROGRESS ── */
.progress-header {
  padding: 1.25rem 1.75rem 1rem;
  border-bottom: 1px solid var(--border);
  background: var(--surface-2);
}

.progress-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.6rem;
}

.progress-label span:first-child {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--violet-light);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.progress-label span:last-child {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.progress-bar-track {
  height: 6px;
  background: var(--border);
  border-radius: 50px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--violet), var(--violet-light));
  border-radius: 50px;
  transition: width 0.4s cubic-bezier(.4,0,.2,1);
}

/* ── FORM STEPS ── */
.form-steps {
  padding: 1.75rem;
}

.step { display: none; animation: fadeIn 0.3s ease; }
.step.active { display: block; }

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

.step-question {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 1.25rem;
  line-height: 1.4;
  letter-spacing: -0.01em;
}

/* ── RADIO OPTIONS ── */
.radio-group {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin-bottom: 1.5rem;
}

.radio-option {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: var(--surface-2);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1rem;
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition);
  user-select: none;
}

.radio-option:hover {
  border-color: var(--violet-light);
  background: rgba(124, 58, 237, 0.08);
}

.radio-option input[type="radio"] {
  appearance: none;
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border: 2px solid var(--text-muted);
  border-radius: 50%;
  flex-shrink: 0;
  transition: border-color var(--transition), background var(--transition);
  position: relative;
}

.radio-option input[type="radio"]::after {
  content: '';
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%) scale(0);
  width: 8px;
  height: 8px;
  background: #fff;
  border-radius: 50%;
  transition: transform var(--transition);
}

.radio-option input[type="radio"]:checked {
  border-color: var(--violet);
  background: var(--violet);
}

.radio-option input[type="radio"]:checked::after {
  transform: translate(-50%, -50%) scale(1);
}

.radio-option:has(input:checked) {
  border-color: var(--violet);
  background: rgba(124, 58, 237, 0.12);
}

.radio-label {
  font-size: 0.92rem;
  color: var(--text);
  font-weight: 500;
}

/* ── CONTACT FIELDS (step 6) ── */
.fields-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.85rem;
  margin-bottom: 1.25rem;
}

.field-full { grid-column: 1 / -1; }

.field-group { display: flex; flex-direction: column; gap: 0.35rem; }

.field-group label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.field-group input {
  background: var(--surface-2);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.75rem 0.9rem;
  font-size: 0.92rem;
  color: var(--text);
  font-family: inherit;
  transition: border-color var(--transition);
  outline: none;
  width: 100%;
}

.field-group input::placeholder { color: var(--text-muted); opacity: 0.6; }

.field-group input:focus { border-color: var(--violet-light); }

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

.field-error {
  font-size: 0.75rem;
  color: var(--error);
  min-height: 1em;
}

/* ── RGPD CHECKBOX ── */
.rgpd-block {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1rem;
  margin-bottom: 1.25rem;
}

.rgpd-label {
  display: flex;
  gap: 0.75rem;
  cursor: pointer;
  align-items: flex-start;
}

.rgpd-label input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  min-width: 18px;
  border: 2px solid var(--text-muted);
  border-radius: 4px;
  margin-top: 2px;
  cursor: pointer;
  transition: all var(--transition);
  position: relative;
  flex-shrink: 0;
}

.rgpd-label input[type="checkbox"]:checked {
  background: var(--violet);
  border-color: var(--violet);
}

.rgpd-label input[type="checkbox"]:checked::after {
  content: '';
  position: absolute;
  left: 4px; top: 1px;
  width: 6px; height: 10px;
  border: 2px solid #fff;
  border-left: none;
  border-top: none;
  transform: rotate(45deg);
}

.rgpd-text {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.55;
}

.rgpd-text a { color: var(--violet-light); text-decoration: underline; }

.rgpd-error {
  font-size: 0.75rem;
  color: var(--error);
  margin-top: 0.4rem;
  min-height: 1em;
}

/* ── NAVIGATION ── */
.form-nav {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  margin-top: 0.25rem;
}

.btn-back {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  background: transparent;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1.1rem;
  color: var(--text-muted);
  font-size: 0.88rem;
  font-weight: 500;
  cursor: pointer;
  transition: border-color var(--transition), color var(--transition);
  font-family: inherit;
}

.btn-back:hover { border-color: var(--text-muted); color: var(--text); }
.btn-back.hidden { visibility: hidden; pointer-events: none; }

.btn-next, .btn-submit {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: linear-gradient(135deg, var(--violet) 0%, #6D28D9 100%);
  border: none;
  border-radius: var(--radius-sm);
  padding: 0.875rem 1.5rem;
  color: #fff;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity var(--transition), transform var(--transition), box-shadow var(--transition);
  font-family: inherit;
  letter-spacing: -0.01em;
}

.btn-next:hover, .btn-submit:hover {
  opacity: 0.9;
  transform: translateY(-1px);
  box-shadow: 0 8px 20px rgba(124, 58, 237, 0.35);
}

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

.btn-submit { background: linear-gradient(135deg, #059669 0%, #10B981 100%); }

.btn-submit:hover { box-shadow: 0 8px 20px rgba(16, 185, 129, 0.35); }

/* ── LOADING STATE ── */
.btn-submit.loading {
  opacity: 0.7;
  pointer-events: none;
}

.spinner {
  width: 16px; height: 16px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  display: none;
}

.loading .spinner { display: block; }
.loading .btn-text { opacity: 0.7; }

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

/* ── SUBMIT ERROR ── */
.submit-error {
  display: none;
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  font-size: 0.85rem;
  color: #FCA5A5;
  margin-bottom: 0.75rem;
  line-height: 1.5;
}

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

/* ── STEP VALIDATION ERROR ── */
.step-error {
  font-size: 0.8rem;
  color: var(--error);
  margin-bottom: 0.75rem;
  min-height: 1.1em;
}

/* ── FOOTER ── */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 1.25rem;
  text-align: center;
  background: var(--surface);
}

.footer-links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.25rem 1.25rem;
  margin-bottom: 0.75rem;
}

.footer-links a {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-decoration: none;
  transition: color var(--transition);
}

.footer-links a:hover { color: var(--violet-light); }

.footer-copy {
  font-size: 0.75rem;
  color: var(--text-muted);
  opacity: 0.6;
}

/* ── MERCI PAGE ── */
.merci-main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - 80px);
  padding: 2rem 1.25rem;
}

.merci-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2.5rem 2rem;
  max-width: 560px;
  width: 100%;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.merci-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--violet), var(--violet-light));
}

.merci-icon {
  width: 72px;
  height: 72px;
  background: rgba(16, 185, 129, 0.12);
  border: 2px solid rgba(16, 185, 129, 0.3);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem;
  color: var(--success);
}

.merci-card h1 {
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 1rem;
}

.merci-card p {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 2rem;
}

.merci-steps {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 2rem;
  text-align: left;
}

.merci-step {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1rem;
}

.merci-step-num {
  width: 26px; height: 26px;
  background: linear-gradient(135deg, var(--violet), var(--violet-light));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
}

.merci-step-text {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.btn-home {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--surface-2);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.8rem 1.5rem;
  color: var(--text);
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  transition: border-color var(--transition), color var(--transition);
  font-family: inherit;
}

.btn-home:hover { border-color: var(--violet-light); color: var(--violet-light); }

/* ── RESPONSIVE ── */
@media (max-width: 520px) {
  .fields-grid { grid-template-columns: 1fr; }
  .intro-banner h1 { font-size: 1.15rem; }
  .merci-card { padding: 2rem 1.25rem; }
  .form-steps { padding: 1.25rem; }
  .progress-header { padding: 1rem 1.25rem 0.85rem; }
}

@media (max-width: 360px) {
  .trust-badges { gap: 0.35rem; }
  .badge { font-size: 0.72rem; padding: 0.25rem 0.6rem; }
}