/* ============================================================
   Nexli AI Sign-up Form — styles.css
   Mobile-first. Custom properties for theming.
   ============================================================ */

:root {
  --c-bg: #f1f5f9;
  --c-surface: #ffffff;
  --c-border: #e2e8f0;
  --c-border-focus: #3b82f6;
  --c-navy: #0f2040;
  --c-navy-light: #1a3358;
  --c-accent: #3b82f6;
  --c-accent-dark: #2563eb;
  --c-accent-green: #059669;
  --c-accent-green-dark: #047857;
  --c-text: #1e293b;
  --c-text-muted: #64748b;
  --c-error: #dc2626;
  --c-error-bg: #fef2f2;
  --c-success: #059669;
  --c-success-bg: #ecfdf5;
  --c-featured: #f0fdf4;
  --c-featured-border: #059669;
  --c-stripe: #635bff;
  --c-stripe-dark: #4f46e5;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  --shadow-sm: 0 1px 3px rgba(0,0,0,.08);
  --shadow-md: 0 4px 16px rgba(0,0,0,.10);
  --shadow-lg: 0 8px 32px rgba(0,0,0,.12);

  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'Courier New', Courier, monospace;

  --max-w: 680px;
}

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

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

body {
  font-family: var(--font-sans);
  background: var(--c-bg);
  color: var(--c-text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── Utility ──────────────────────────────────────────────── */

.hidden { display: none !important; }

.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

.req { color: var(--c-error); margin-left: 2px; }

/* ── Header ───────────────────────────────────────────────── */

.site-header {
  background: var(--c-navy);
  color: #fff;
  padding: 20px 24px;
}

.header-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 16px;
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.5px;
}

.logo-accent { color: #60a5fa; }

.header-tagline {
  font-size: 0.875rem;
  color: #94a3b8;
  border-left: 1px solid #334155;
  padding-left: 16px;
}

/* ── Main shell ───────────────────────────────────────────── */

.form-shell {
  flex: 1;
  max-width: var(--max-w);
  margin: 0 auto;
  width: 100%;
  padding: 24px 16px 48px;
}

/* ── Progress nav ─────────────────────────────────────────── */

.progress-nav {
  margin-bottom: 28px;
}

.progress-steps {
  list-style: none;
  display: flex;
  gap: 0;
  counter-reset: none;
}

.step {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
  gap: 4px;
}

.step::after {
  content: '';
  position: absolute;
  top: 14px;
  left: 50%;
  width: 100%;
  height: 2px;
  background: var(--c-border);
  z-index: 0;
}

.step:last-child::after { display: none; }

.step-num {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--c-surface);
  border: 2px solid var(--c-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--c-text-muted);
  z-index: 1;
  transition: background 0.2s, border-color 0.2s, color 0.2s;
}

.step-label {
  font-size: 0.65rem;
  color: var(--c-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
}

.step.active .step-num {
  background: var(--c-accent);
  border-color: var(--c-accent);
  color: #fff;
}

.step.active .step-label { color: var(--c-accent); }

.step.done .step-num {
  background: var(--c-accent-green);
  border-color: var(--c-accent-green);
  color: #fff;
}

.step.done::after { background: var(--c-accent-green); }

/* ── Stage card ───────────────────────────────────────────── */

.stage {
  background: var(--c-surface);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  box-shadow: var(--shadow-md);
}

.stage-heading {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--c-navy);
  margin-bottom: 6px;
  letter-spacing: -0.3px;
}

.stage-subhead {
  color: var(--c-text-muted);
  margin-bottom: 28px;
  font-size: 0.95rem;
}

/* ── Form fields ──────────────────────────────────────────── */

.field-group {
  margin-bottom: 20px;
}

.field-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--c-text);
  margin-bottom: 6px;
}

.field-group input[type="text"],
.field-group input[type="email"],
.field-group input[type="tel"],
.field-group input[type="url"],
.field-group textarea {
  width: 100%;
  padding: 10px 14px;
  border: 1.5px solid var(--c-border);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-family: var(--font-sans);
  color: var(--c-text);
  background: #fff;
  transition: border-color 0.15s, box-shadow 0.15s;
  outline: none;
}

.field-group input:focus,
.field-group textarea:focus {
  border-color: var(--c-border-focus);
  box-shadow: 0 0 0 3px rgba(59,130,246,.15);
}

.field-group input.invalid,
.field-group textarea.invalid {
  border-color: var(--c-error);
  background: var(--c-error-bg);
}

.field-group textarea { resize: vertical; min-height: 80px; }

.field-hint {
  font-size: 0.78rem;
  color: var(--c-text-muted);
  margin-top: 4px;
}

.field-error {
  display: block;
  font-size: 0.8rem;
  color: var(--c-error);
  margin-top: 4px;
  min-height: 1em;
  font-weight: 500;
}

/* ── Vertical cards ───────────────────────────────────────── */

.vertical-fieldset { border: none; }

.vertical-card {
  display: block;
  cursor: pointer;
  border: 2px solid var(--c-border);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.vertical-card:hover { border-color: var(--c-accent); }

.vertical-card input[type="radio"] {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.vertical-card:has(input:checked) {
  border-color: var(--c-accent);
  box-shadow: 0 0 0 3px rgba(59,130,246,.12);
}

.vertical-card-inner {
  display: flex;
  align-items: center;
  padding: 16px 20px;
  gap: 16px;
}

.vertical-icon { font-size: 1.75rem; flex-shrink: 0; }

.vertical-text {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.vertical-text strong { font-size: 1.05rem; color: var(--c-navy); }
.vertical-text span { font-size: 0.85rem; color: var(--c-text-muted); }

.vertical-check {
  width: 22px;
  height: 22px;
  border: 2px solid var(--c-border);
  border-radius: 50%;
  flex-shrink: 0;
  transition: all 0.15s;
}

.vertical-card:has(input:checked) .vertical-check {
  background: var(--c-accent);
  border-color: var(--c-accent);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 10'%3E%3Cpath d='M1 5l3.5 3.5L11 1' stroke='white' stroke-width='2' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
  background-size: 10px;
}

/* ── Connections ──────────────────────────────────────────── */

.connection-list { display: flex; flex-direction: column; gap: 12px; margin-bottom: 20px; }

.connection-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border: 1.5px solid var(--c-border);
  border-radius: var(--radius-md);
  gap: 16px;
}

.connection-info {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  flex: 1;
}

.conn-icon { font-size: 1.5rem; flex-shrink: 0; margin-top: 2px; }

.connection-info strong { font-size: 0.95rem; display: block; margin-bottom: 2px; }
.connection-info p { font-size: 0.82rem; color: var(--c-text-muted); }

.optional-tag {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--c-text-muted);
  background: var(--c-bg);
  border: 1px solid var(--c-border);
  border-radius: 4px;
  padding: 1px 6px;
  margin-left: 6px;
  vertical-align: middle;
}

.btn-connect {
  flex-shrink: 0;
  padding: 8px 18px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  border: 1.5px solid var(--c-accent);
  color: var(--c-accent);
  background: transparent;
  transition: background 0.15s, color 0.15s;
  white-space: nowrap;
}

.btn-connect:hover {
  background: var(--c-accent);
  color: #fff;
}

.btn-connect.connected {
  border-color: var(--c-accent-green);
  color: var(--c-accent-green);
}

.btn-connect.connected:hover {
  background: var(--c-accent-green);
  color: #fff;
}

.stage-note {
  font-size: 0.8rem;
  color: var(--c-text-muted);
  background: var(--c-bg);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  border: 1px solid var(--c-border);
}

/* ── Tier cards ───────────────────────────────────────────── */

.tier-group { margin-bottom: 28px; }

.tier-fieldset {
  border: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.tier-card {
  display: block;
  cursor: pointer;
  border: 2px solid var(--c-border);
  border-radius: var(--radius-md);
  position: relative;
  transition: border-color 0.15s, box-shadow 0.15s;
  overflow: hidden;
}

.tier-card:hover { border-color: var(--c-accent); }

.tier-card.featured { border-color: var(--c-featured-border); background: var(--c-featured); }

.tier-card:has(input:checked) {
  border-color: var(--c-accent);
  box-shadow: 0 0 0 3px rgba(59,130,246,.12);
}

.tier-badge {
  position: absolute;
  top: 0;
  right: 0;
  background: var(--c-accent-green);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 3px 10px;
  border-bottom-left-radius: var(--radius-sm);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.tier-card input[type="radio"] {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.tier-card-inner { padding: 20px 22px; }

.tier-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 12px;
}

.tier-name { font-size: 1.05rem; font-weight: 700; color: var(--c-navy); }

.tier-price {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--c-navy);
  letter-spacing: -0.5px;
}

.tier-period { font-size: 0.9rem; font-weight: 500; color: var(--c-text-muted); }

.tier-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.tier-features li {
  font-size: 0.875rem;
  color: var(--c-text);
  padding-left: 18px;
  position: relative;
}

.tier-features li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--c-accent-green);
  font-weight: 700;
}

/* ── Stripe section ───────────────────────────────────────── */

.stripe-section {
  background: #f8f7ff;
  border: 1.5px solid #c7c4f5;
  border-radius: var(--radius-md);
  padding: 20px 22px;
  margin-bottom: 24px;
}

.stripe-intro { font-size: 0.9rem; color: var(--c-text); margin-bottom: 14px; }

.btn-stripe {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 13px 24px;
  background: var(--c-stripe);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
  margin-bottom: 10px;
}

.btn-stripe:hover { background: var(--c-stripe-dark); }

.stripe-lock { font-size: 1rem; }

.stripe-note {
  font-size: 0.78rem;
  color: var(--c-text-muted);
}

.stripe-status {
  margin-top: 12px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
}

.stripe-status.success {
  background: var(--c-success-bg);
  color: var(--c-success);
  border: 1px solid #a7f3d0;
}

.stripe-status.pending {
  background: #f8f7ff;
  color: var(--c-stripe);
  border: 1px solid #c7c4f5;
}

/* ── Review panel ─────────────────────────────────────────── */

.review-panel {
  border: 1.5px solid var(--c-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: 20px;
}

.review-section { padding: 16px 20px; border-bottom: 1px solid var(--c-border); }
.review-section:last-child { border-bottom: none; }

.review-section-title {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--c-text-muted);
  margin-bottom: 10px;
}

.review-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 6px;
  font-size: 0.875rem;
}

.review-row:last-child { margin-bottom: 0; }
.review-label { color: var(--c-text-muted); flex-shrink: 0; }
.review-value { color: var(--c-text); font-weight: 500; text-align: right; word-break: break-word; }

/* ── Payload debug ────────────────────────────────────────── */

.payload-debug {
  margin-bottom: 20px;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.payload-debug summary {
  padding: 10px 16px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--c-text-muted);
  cursor: pointer;
  background: var(--c-bg);
  user-select: none;
}

.payload-pre {
  padding: 16px;
  background: #1e293b;
  color: #e2e8f0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1.7;
  overflow-x: auto;
  white-space: pre;
}

/* ── Submit success ───────────────────────────────────────── */

.submit-success {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 16px 20px;
  background: var(--c-success-bg);
  border: 1.5px solid #a7f3d0;
  border-radius: var(--radius-md);
  margin-bottom: 20px;
}

.success-icon { font-size: 1.5rem; flex-shrink: 0; }

.submit-success strong { display: block; color: var(--c-success); margin-bottom: 2px; }
.submit-success p { font-size: 0.875rem; color: var(--c-text-muted); }
.submit-success code { font-family: var(--font-mono); font-size: 0.85em; background: #d1fae5; padding: 1px 4px; border-radius: 3px; }

/* ── Stage actions ────────────────────────────────────────── */

.stage-actions {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid var(--c-border);
}

.btn-primary,
.btn-secondary {
  padding: 11px 28px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, opacity 0.15s;
  border: none;
}

.btn-primary {
  background: var(--c-accent);
  color: #fff;
}

.btn-primary:hover { background: var(--c-accent-dark); }

.btn-primary:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn-secondary {
  background: var(--c-bg);
  color: var(--c-text);
  border: 1.5px solid var(--c-border);
}

.btn-secondary:hover { background: var(--c-border); }

.btn-submit { background: var(--c-accent-green); }
.btn-submit:hover { background: var(--c-accent-green-dark); }

/* ── Footer ───────────────────────────────────────────────── */

.site-footer {
  text-align: center;
  padding: 20px 16px;
  font-size: 0.8rem;
  color: var(--c-text-muted);
  border-top: 1px solid var(--c-border);
  background: var(--c-surface);
}

.site-footer a { color: var(--c-accent); text-decoration: none; }
.site-footer a:hover { text-decoration: underline; }

/* ── Responsive ───────────────────────────────────────────── */

@media (min-width: 540px) {
  .tier-fieldset {
    flex-direction: row;
    align-items: stretch;
  }

  .tier-card { flex: 1; }

  .connection-item { gap: 20px; }
}

@media (max-width: 400px) {
  .stage { padding: 24px 16px; }
  .stage-heading { font-size: 1.25rem; }
  .step-label { display: none; }
}