/* ===== Design System (match PricingCP page) ===== */
:root {
  --bg: #0f172a;
  --panel: rgba(255, 255, 255, 0.06);
  --panel-strong: rgba(255, 255, 255, 0.1);
  --border: rgba(255, 255, 255, 0.12);

  --text: #e5e7eb;
  --muted: rgba(255, 255, 255, 0.78);

  --accent: #6366f1;
  --accent-2: #59407d;

  --radius: 16px;
  --shadow: 0 18px 40px rgba(0, 0, 0, 0.35);

  --container: 1100px;
  --pad-x: 20px;
}

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

body {
  margin: 0;
  font-family:
    "Source Sans Pro",
    system-ui,
    -apple-system,
    Segoe UI,
    Roboto,
    Arial,
    sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 44px var(--pad-x) 60px;
}

h1,
h2,
h3 {
  margin: 0;
  font-weight: 700;
  color: var(--text);
}

p {
  margin: 0;
  color: var(--muted);
}

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 18px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(33, 42, 62, 0.55);
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
  cursor: pointer;
  transition:
    transform 0.15s ease,
    background 0.15s ease,
    border-color 0.15s ease;
}

.btn:hover {
  transform: translateY(-1px);
  background: rgba(33, 42, 62, 0.75);
  border-color: rgba(255, 255, 255, 0.22);
}

.btn--primary {
  background: rgba(99, 102, 241, 0.85);
  border-color: rgba(99, 102, 241, 0.55);
}

.btn--primary:hover {
  background: rgba(99, 102, 241, 1);
}

.signup-header {
  margin-bottom: 22px;
}

.back-link {
  display: inline-block;
  margin-bottom: 10px;
  color: rgba(255, 255, 255, 0.82);
  text-decoration: none;
}
.back-link:hover {
  text-decoration: underline;
}

.heading {
  font-size: 42px;
  line-height: 1.15;
}

.subheading {
  margin-top: 10px;
  max-width: 720px;
}

/* Layout */
.signup-grid {
  display: grid;
  grid-template-columns: 1.35fr 0.65fr;
  gap: 20px;
  align-items: start;
}

.signup-card {
  padding: 22px;
}

.summary-card {
  padding: 18px;
}

.summary-title {
  font-size: 20px;
  margin-bottom: 12px;
}

.summary-row {
  display: flex;
  justify-content: space-between;
  padding: 10px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.summary-row:last-of-type {
  border-bottom: none;
}

.summary-note {
  margin-top: 12px;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.72);
}

/* Form */
.field {
  display: grid;
  gap: 8px;
  margin-bottom: 14px;
}

label {
  font-weight: 700;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.92);
}

input[type="text"],
input[type="email"],
input[type="password"] {
  width: 100%;
  padding: 12px 12px;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  background: rgba(0, 0, 0, 0.25);
  color: var(--text);
  outline: none;
}

input:focus {
  border-color: rgba(99, 102, 241, 0.8);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.25);
}

.hint {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.68);
}

.divider {
  height: 1px;
  background: rgba(255, 255, 255, 0.12);
  margin: 16px 0;
}

/* Segmented billing */
.segmented {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 14px;
  overflow: hidden;
  background: rgba(0, 0, 0, 0.18);
}

.segmented__option {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 12px;
  cursor: pointer;
}

.segmented__option input {
  display: none;
}

.segmented__option span {
  font-weight: 700;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.88);
}

.segmented__option input:checked + span {
  color: #fff;
}

.segmented__option:has(input:checked) {
  background: rgba(99, 102, 241, 0.18);
}

.save-badge {
  font-style: normal;
  font-size: 12px;
  padding: 4px 8px;
  border-radius: 999px;
  border: 1px solid rgba(99, 102, 241, 0.45);
  background: rgba(99, 102, 241, 0.18);
  color: rgba(255, 255, 255, 0.92);
}

/* Plan picker */
.plan-picker {
  display: grid;
  gap: 10px;
}

.plan-option {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 12px 12px;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: rgba(0, 0, 0, 0.18);
  cursor: pointer;
  transition:
    transform 0.15s ease,
    border-color 0.15s ease,
    background 0.15s ease;
}

.plan-option input {
  display: none;
}

.plan-option:hover {
  transform: translateY(-1px);
  border-color: rgba(255, 255, 255, 0.22);
  background: rgba(0, 0, 0, 0.22);
}

.plan-option:has(input:checked) {
  border-color: rgba(99, 102, 241, 0.65);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.22);
}

.plan-meta strong {
  display: block;
  font-size: 16px;
}

.plan-meta .muted {
  display: block;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.68);
}

.plan-price {
  font-weight: 800;
  color: rgba(255, 255, 255, 0.92);
}

.plan-option--featured {
  border-color: rgba(99, 102, 241, 0.35);
  background: rgba(99, 102, 241, 0.08);
}

.checkbox {
  margin-top: 6px;
}

.checkline {
  display: flex;
  gap: 10px;
  align-items: center;
}

.checkline input {
  width: 18px;
  height: 18px;
}

.error {
  min-height: 18px;
  font-size: 13px;
  color: #ffb4b4;
}

.submit {
  width: 100%;
  margin-top: 8px;
}

.fineprint {
  margin-top: 10px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.65);
}

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

  .heading {
    font-size: 36px;
  }
}