:root {
  --brand-green: #91A107;
  --brand-green-bright: #B8CD29;
  --ink: #1D1D1B;
  --ink-soft: #616161;
  --white: #FFFFFF;
  --panel-tint: #F5FAFF;
  --border-tint: #E3EEFF;
  --navy: #002249;
  --steel-blue: #69A1BB;
  --radius-card: 8px;
  --font: "Ubuntu", "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--font);
  font-weight: 400;
  color: var(--ink);
  background: var(--white);
}

/* ---------- Header ---------- */
.brand-header {
  display: flex;
  align-items: center;
  padding: 20px clamp(20px, 6vw, 64px);
  border-bottom: 1px solid var(--border-tint);
}

.brand-logo {
  height: 34px;
  width: auto;
}

/* ---------- Shell ---------- */
.form-shell {
  max-width: 640px;
  margin: 0 auto;
  padding: 40px 20px 80px;
}

.progress-track {
  height: 6px;
  border-radius: 3px;
  background: var(--border-tint);
  overflow: hidden;
  margin-bottom: 8px;
}

.progress-fill {
  height: 100%;
  width: 16.6%;
  background: var(--brand-green);
  transition: width 0.3s ease;
}

.step-counter {
  font-size: 13px;
  color: var(--ink-soft);
  margin-bottom: 32px;
}

/* ---------- Steps ---------- */
.step { display: none; }
.step.active { display: block; animation: fadeIn 0.25s ease; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

h1 {
  font-weight: 700;
  font-size: clamp(20px, 3vw, 26px);
  line-height: 1.3;
  margin: 0 0 20px;
}

h2 {
  font-weight: 700;
  font-size: 19px;
  margin: 0 0 16px;
}

h3 {
  font-weight: 500;
  font-size: 15px;
  color: var(--ink-soft);
  margin: 28px 0 14px;
}

.step-hint {
  font-size: 14px;
  color: var(--ink-soft);
  margin: -12px 0 24px;
}

.branch-title {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: var(--brand-green);
  background: var(--panel-tint);
  padding: 4px 10px;
  border-radius: 4px;
  margin-bottom: 14px;
}

.tech-branch.visible.with-divider {
  margin-top: 8px;
  padding-top: 32px;
  border-top: 1px solid var(--border-tint);
}

/* ---------- Option cards ---------- */
.option-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.option-grid-1col {
  grid-template-columns: 1fr;
}

.option-card {
  position: relative;
  display: flex;
  align-items: center;
  padding: 16px 18px;
  border: 1.5px solid var(--border-tint);
  border-radius: var(--radius-card);
  cursor: pointer;
  font-size: 15px;
  transition: border-color 0.15s ease, background 0.15s ease;
  background: var(--white);
}

.option-card:hover {
  border-color: var(--brand-green-bright);
}

.option-card input {
  position: absolute;
  opacity: 0;
}

.option-card:has(input:checked) {
  border-color: var(--brand-green);
  background: var(--panel-tint);
  box-shadow: inset 0 0 0 1px var(--brand-green);
}

/* ---------- Fields ---------- */
.field-group {
  margin-bottom: 18px;
}

.field-group label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 6px;
}

.field-group input[type="text"],
.field-group input[type="email"],
.field-group input[type="tel"],
.field-group select,
.field-group textarea {
  width: 100%;
  padding: 13px 14px;
  border: 1.5px solid var(--border-tint);
  border-radius: 6px;
  font-family: var(--font);
  font-size: 15px;
  color: var(--ink);
  background: var(--white);
}

.field-group input:focus,
.field-group select:focus,
.field-group textarea:focus {
  outline: none;
  border-color: var(--brand-green);
}

/* ---------- Tech branches ---------- */
.tech-branch { display: none; }
.tech-branch.visible { display: block; }

/* ---------- Nav buttons ---------- */
.nav-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 36px;
}

.btn-back,
.btn-next,
.btn-submit {
  font-family: var(--font);
  font-size: 15px;
  font-weight: 500;
  padding: 14px 34px;
  border: none;
  cursor: pointer;
  transition: background 0.2s ease;
}

.btn-back {
  background: transparent;
  color: var(--ink-soft);
  padding-left: 0;
}

.btn-back:hover { color: var(--ink); }

.btn-next,
.btn-submit {
  background: var(--brand-green);
  color: var(--white);
  margin-left: auto;
}

.btn-next:hover,
.btn-submit:hover {
  background: var(--ink);
}

.btn-back[hidden] { visibility: hidden; }

/* ---------- Success ---------- */
.success-panel {
  text-align: center;
  padding: 60px 20px;
}

.success-panel h1 { margin-bottom: 12px; }
.success-panel p { color: var(--ink-soft); font-size: 16px; max-width: 480px; margin: 0 auto; }

#debugOutput {
  margin-top: 32px;
  text-align: left;
  background: var(--panel-tint);
  border: 1px solid var(--border-tint);
  border-radius: 8px;
  padding: 16px;
  font-size: 12px;
  white-space: pre-wrap;
  color: var(--ink-soft);
}

/* ---------- Responsive ---------- */
@media (max-width: 520px) {
  .option-grid { grid-template-columns: 1fr; }
  .brand-header { flex-direction: column; align-items: flex-start; gap: 4px; }
}