/* ============================================================
   Vaultstone Bank — Auth Stylesheet (login.html + signup.html)
   Design System: Dark Navy + Gold
   ============================================================ */

/* ── Google Fonts loaded via <link> in HTML ── */

/* ============================================================
   1. CSS Custom Properties
   ============================================================ */
:root {
  --primary:        #0A0E1A;
  --primary-deep:   #060810;
  --surface:        #111827;
  --surface-2:      #1a2236;
  --surface-3:      #1f2a40;
  --accent:         #C9A84C;
  --accent-light:   #E8C97A;
  --accent-dim:     rgba(201, 168, 76, 0.12);
  --accent-border:  rgba(201, 168, 76, 0.25);
  --accent-glow:    rgba(201, 168, 76, 0.40);
  --accent-glow-sm: rgba(201, 168, 76, 0.20);
  --text:           #F9FAFB;
  --text-secondary: #CBD5E1;
  --muted:          #6B7280;
  --muted-2:        #374151;
  --success:        #10B981;
  --danger:         #EF4444;
  --glass-bg:       rgba(17, 24, 39, 0.75);
  --glass-border:   rgba(255, 255, 255, 0.06);
  --glass-blur:     24px;

  --font-base: 'Inter', system-ui, -apple-system, sans-serif;

  --radius-sm:  6px;
  --radius-md:  12px;
  --radius-lg:  18px;
  --radius-xl:  24px;
  --radius-full: 9999px;

  --shadow-gold: 0 0 0 3px rgba(201, 168, 76, 0.30),
                 0 0 20px rgba(201, 168, 76, 0.12);
  --shadow-card: 0 32px 80px rgba(0,0,0,0.60),
                 0 8px 24px rgba(0,0,0,0.40);
  --transition: 0.22s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================================
   2. Reset + Base
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  height: 100%;
  font-family: var(--font-base);
  color: var(--text);
  background: var(--primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-light); }

button { font-family: var(--font-base); cursor: pointer; border: none; background: none; }

/* ============================================================
   3. Login Page — Split Layout
   ============================================================ */
.auth-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 100vh;
  position: relative;
}

/* Left — Three.js Canvas Panel */
.auth-canvas-panel {
  position: relative;
  overflow: hidden;
  background: var(--primary-deep);
}

#login-canvas {
  display: block;
  width: 100%;
  height: 100%;
  position: absolute;
  inset: 0;
}

.canvas-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(10, 14, 26, 0.15) 0%,
    rgba(10, 14, 26, 0.05) 50%,
    rgba(10, 14, 26, 0.20) 100%
  );
  pointer-events: none;
  z-index: 1;
}

.canvas-brand {
  position: absolute;
  bottom: 40px;
  left: 40px;
  z-index: 2;
  pointer-events: none;
}

.canvas-brand__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.canvas-brand__icon {
  width: 36px;
  height: 36px;
  background: var(--accent);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
}

.canvas-brand__icon svg {
  width: 20px;
  height: 20px;
}

.canvas-brand__name {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
}

.canvas-brand__name span { color: var(--accent); }

.canvas-brand__tagline {
  font-size: 0.8125rem;
  color: var(--muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* Right — Form Panel */
.auth-form-panel {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px 32px;
  background: var(--surface);
  position: relative;
  overflow: hidden;
}

.auth-form-panel::before {
  content: '';
  position: absolute;
  top: -200px;
  right: -200px;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(201,168,76,0.06) 0%, transparent 70%);
  pointer-events: none;
}

.auth-form-panel::after {
  content: '';
  position: absolute;
  bottom: -150px;
  left: -150px;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(59,130,246,0.04) 0%, transparent 70%);
  pointer-events: none;
}

/* ============================================================
   4. Auth Card (Glass Morphism)
   ============================================================ */
.auth-card {
  width: 100%;
  max-width: 440px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: 48px 44px;
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  box-shadow: var(--shadow-card);
  position: relative;
  z-index: 1;
}

/* Signup card sits on top of canvas */
.signup-card {
  width: 100%;
  max-width: 520px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: 44px 48px;
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  box-shadow: var(--shadow-card);
  position: relative;
  z-index: 2;
}

/* ============================================================
   5. Login Logo + Header
   ============================================================ */
.auth-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 32px;
}

.auth-logo__icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  flex-shrink: 0;
}

.auth-logo__icon svg {
  width: 22px;
  height: 22px;
}

.auth-logo__text {
  font-size: 1.3rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text);
}

.auth-logo__text span { color: var(--accent); }

.auth-header {
  margin-bottom: 32px;
}

.auth-header h1 {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text);
  line-height: 1.2;
  margin-bottom: 6px;
}

.auth-header p {
  font-size: 0.9375rem;
  color: var(--muted);
  line-height: 1.5;
}

/* ============================================================
   6. Floating Label Inputs
   ============================================================ */
.field-group {
  position: relative;
  margin-bottom: 20px;
}

.field-group__input {
  width: 100%;
  padding: 20px 16px 8px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-md);
  color: var(--text);
  font-family: var(--font-base);
  font-size: 0.9375rem;
  font-weight: 400;
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
  -webkit-appearance: none;
  appearance: none;
}

/* Restore native date rendering so Chrome can display all 4 year digits correctly */
input[type="date"].field-group__input {
  -webkit-appearance: auto;
  appearance: auto;
  color-scheme: dark;
  padding: 22px 14px 6px 16px;
}
input[type="date"].field-group__input::-webkit-calendar-picker-indicator {
  cursor: pointer;
  opacity: 0.6;
  margin-left: 4px;
}

.field-group__input::placeholder { color: transparent; }

.field-group__input:focus {
  background: rgba(201,168,76,0.04);
  border-color: var(--accent);
  box-shadow: var(--shadow-gold);
}

.field-group__input.error {
  border-color: var(--danger);
  box-shadow: 0 0 0 3px rgba(239,68,68,0.20);
}

.field-group__label {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.9375rem;
  color: var(--muted);
  pointer-events: none;
  transition: top 0.18s cubic-bezier(0.4,0,0.2,1),
              font-size 0.18s cubic-bezier(0.4,0,0.2,1),
              color 0.18s cubic-bezier(0.4,0,0.2,1);
  white-space: nowrap;
}

/* Float label when input has content or is focused */
.field-group__input:focus ~ .field-group__label,
.field-group__input:not(:placeholder-shown) ~ .field-group__label,
.field-group__input.has-value ~ .field-group__label {
  top: 10px;
  transform: none;
  font-size: 0.70rem;
  color: var(--accent);
  font-weight: 500;
  letter-spacing: 0.03em;
}

/* Password toggle */
.field-group--password { position: relative; }

.field-group__toggle {
  position: absolute;
  right: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--muted);
  cursor: pointer;
  transition: color var(--transition);
  background: none;
  border: none;
  padding: 0;
  z-index: 2;
}

.field-group__toggle:hover { color: var(--accent); }
.field-group__toggle svg { width: 18px; height: 18px; }

/* Inline error message */
.field-error {
  display: block;
  font-size: 0.775rem;
  color: var(--danger);
  margin-top: 5px;
  padding-left: 2px;
  opacity: 0;
  transform: translateY(-4px);
  transition: opacity 0.18s ease, transform 0.18s ease;
}

.field-error.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================================
   7. Select (Country Dropdown)
   ============================================================ */
.field-group__select {
  width: 100%;
  padding: 20px 40px 8px 16px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-md);
  color: var(--text);
  font-family: var(--font-base);
  font-size: 0.9375rem;
  outline: none;
  -webkit-appearance: none;
  appearance: none;
  cursor: pointer;
  transition: border-color var(--transition), box-shadow var(--transition);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%236B7280' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
}

.field-group__select:focus {
  border-color: var(--accent);
  box-shadow: var(--shadow-gold);
  background-color: rgba(201,168,76,0.04);
}

.field-group__select option {
  background: var(--surface);
  color: var(--text);
}

/* Select floating label */
.field-group__select ~ .field-group__label {
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.9375rem;
  color: var(--muted);
}

.field-group__select.has-value ~ .field-group__label,
.field-group__select:focus ~ .field-group__label {
  top: 10px;
  transform: none;
  font-size: 0.70rem;
  color: var(--accent);
  font-weight: 500;
}

/* ============================================================
   8. Side-by-side fields
   ============================================================ */
.fields-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

/* ============================================================
   9. Forgot Password + Form utilities
   ============================================================ */
.forgot-link {
  display: block;
  text-align: right;
  font-size: 0.8125rem;
  color: var(--accent);
  margin-top: -10px;
  margin-bottom: 24px;
  transition: color var(--transition);
}
.forgot-link:hover { color: var(--accent-light); }

/* ============================================================
   10. Buttons
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 16px 24px;
  border-radius: var(--radius-md);
  font-family: var(--font-base);
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  cursor: pointer;
  border: none;
  outline: none;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

/* Gold primary button */
.btn--primary {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-light) 100%);
  color: var(--primary);
  box-shadow: 0 4px 20px rgba(201,168,76,0.30);
}

.btn--primary:hover {
  box-shadow: 0 6px 28px rgba(201,168,76,0.45);
  transform: translateY(-1px);
}

.btn--primary:active { transform: translateY(0); }

/* Shimmer sweep on hover */
.btn--primary::after {
  content: '';
  position: absolute;
  top: 0; left: -100%;
  width: 60%;
  height: 100%;
  background: linear-gradient(
    105deg,
    transparent 0%,
    rgba(255,255,255,0.35) 50%,
    transparent 100%
  );
  transition: left 0.45s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn--primary:hover::after { left: 160%; }

/* Disabled / loading state */
.btn--primary:disabled {
  opacity: 0.7;
  cursor: not-allowed;
  transform: none;
}

/* OAuth buttons */
.btn--oauth {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.09);
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 13px 20px;
  border-radius: var(--radius-md);
}

.btn--oauth:hover {
  background: rgba(255,255,255,0.07);
  border-color: rgba(255,255,255,0.14);
  color: var(--text);
}

.btn--oauth svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

/* Spinner */
.btn__spinner {
  display: none;
  width: 18px;
  height: 18px;
  border: 2.5px solid rgba(10,14,26,0.30);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

.btn.loading .btn__spinner { display: block; }
.btn.loading .btn__text { display: none; }

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

/* ============================================================
   11. Divider
   ============================================================ */
.auth-divider {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 24px 0;
}

.auth-divider__line {
  flex: 1;
  height: 1px;
  background: rgba(255,255,255,0.07);
}

.auth-divider__text {
  font-size: 0.8125rem;
  color: var(--muted);
  white-space: nowrap;
}

/* ============================================================
   12. OAuth Grid
   ============================================================ */
.oauth-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 24px;
}

/* ============================================================
   13. Footer links + Security badge
   ============================================================ */
.auth-footer-link {
  text-align: center;
  font-size: 0.875rem;
  color: var(--muted);
  margin-top: 24px;
}

.auth-footer-link a {
  color: var(--accent);
  font-weight: 500;
}

.auth-footer-link a:hover { color: var(--accent-light); }

.security-badge {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  margin-top: 28px;
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.05);
  font-size: 0.775rem;
  color: var(--muted);
  letter-spacing: 0.02em;
}

.security-badge svg {
  width: 14px;
  height: 14px;
  color: var(--accent);
  opacity: 0.8;
  flex-shrink: 0;
}

/* ============================================================
   14. Signup Page — Full-page canvas + centered card
   ============================================================ */
.signup-page {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px 20px;
  background: var(--primary);
  overflow: hidden;
}

#signup-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

.signup-overlay {
  position: fixed;
  inset: 0;
  background: rgba(10, 14, 26, 0.55);
  z-index: 1;
  pointer-events: none;
}

/* ============================================================
   15. Step Progress Bar
   ============================================================ */
.step-progress {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 36px;
  position: relative;
}

.step-progress__track {
  display: flex;
  align-items: center;
  gap: 0;
  width: 100%;
  max-width: 360px;
}

.step-progress__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  flex: 1;
  position: relative;
}

/* Connecting line between steps */
.step-progress__item:not(:last-child)::after {
  content: '';
  position: absolute;
  top: 16px;
  left: calc(50% + 16px);
  width: calc(100% - 32px);
  height: 2px;
  background: rgba(255,255,255,0.08);
  transition: background 0.4s ease;
  z-index: 0;
}

.step-progress__item.completed:not(:last-child)::after {
  background: var(--accent);
}

.step-progress__circle {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 2px solid rgba(255,255,255,0.12);
  background: rgba(255,255,255,0.04);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--muted);
  position: relative;
  z-index: 1;
  transition: all 0.35s cubic-bezier(0.4,0,0.2,1);
}

.step-progress__item.active .step-progress__circle {
  border-color: var(--accent);
  background: rgba(201,168,76,0.15);
  color: var(--accent);
  box-shadow: 0 0 0 4px rgba(201,168,76,0.12), 0 0 16px rgba(201,168,76,0.25);
}

.step-progress__item.completed .step-progress__circle {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--primary);
}

.step-progress__label {
  font-size: 0.6875rem;
  color: var(--muted);
  font-weight: 500;
  letter-spacing: 0.03em;
  text-align: center;
  white-space: nowrap;
  transition: color 0.35s ease;
}

.step-progress__item.active .step-progress__label { color: var(--accent); }
.step-progress__item.completed .step-progress__label { color: var(--text-secondary); }

/* ============================================================
   16. Step Panels
   ============================================================ */
.step-panels {
  overflow: hidden;
  position: relative;
}

.step-panel {
  display: none;
}

.step-panel.active {
  display: block;
}

/* ============================================================
   17. Account Type Cards
   ============================================================ */
.account-type-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-bottom: 8px;
}

.account-type-card {
  padding: 18px 20px;
  background: rgba(255,255,255,0.03);
  border: 1.5px solid rgba(255,255,255,0.07);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all 0.22s cubic-bezier(0.4,0,0.2,1);
  display: flex;
  align-items: center;
  gap: 16px;
  user-select: none;
  position: relative;
  overflow: hidden;
}

.account-type-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(201,168,76,0.05) 0%, transparent 60%);
  opacity: 0;
  transition: opacity 0.22s ease;
}

.account-type-card:hover {
  border-color: rgba(201,168,76,0.30);
  background: rgba(201,168,76,0.05);
  transform: translateY(-2px);
}

.account-type-card:hover::before { opacity: 1; }

.account-type-card.selected {
  border-color: var(--accent);
  background: rgba(201,168,76,0.08);
  box-shadow: 0 0 0 1px rgba(201,168,76,0.15), 0 4px 20px rgba(201,168,76,0.15);
}

.account-type-card.selected::before { opacity: 1; }

.account-type-card__icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: rgba(201,168,76,0.10);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  flex-shrink: 0;
  transition: background 0.22s ease;
}

.account-type-card__icon svg {
  width: 22px;
  height: 22px;
}

.account-type-card.selected .account-type-card__icon {
  background: rgba(201,168,76,0.18);
}

.account-type-card__info { flex: 1; }

.account-type-card__title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 2px;
}

.account-type-card__desc {
  font-size: 0.8125rem;
  color: var(--muted);
  line-height: 1.4;
}

.account-type-card__check {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 2px solid rgba(255,255,255,0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all 0.22s ease;
}

.account-type-card__check svg {
  width: 10px;
  height: 10px;
  color: var(--primary);
  opacity: 0;
  transition: opacity 0.22s ease;
}

.account-type-card.selected .account-type-card__check {
  background: var(--accent);
  border-color: var(--accent);
}

.account-type-card.selected .account-type-card__check svg { opacity: 1; }

/* ============================================================
   18. Password Strength Meter
   ============================================================ */
.strength-meter {
  margin-top: 10px;
  margin-bottom: 20px;
}

.strength-meter__bars {
  display: flex;
  gap: 6px;
  margin-bottom: 6px;
}

.strength-bar {
  flex: 1;
  height: 4px;
  border-radius: 2px;
  background: rgba(255,255,255,0.08);
  transition: background 0.3s ease;
}

.strength-bar.weak   { background: #EF4444; }
.strength-bar.fair   { background: #F59E0B; }
.strength-bar.good   { background: #3B82F6; }
.strength-bar.strong { background: #10B981; }

.strength-meter__label {
  font-size: 0.75rem;
  color: var(--muted);
  transition: color 0.3s ease;
}

.strength-meter__label.weak   { color: #EF4444; }
.strength-meter__label.fair   { color: #F59E0B; }
.strength-meter__label.good   { color: #3B82F6; }
.strength-meter__label.strong { color: #10B981; }

/* ============================================================
   19. Checkbox
   ============================================================ */
.checkbox-field {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  cursor: pointer;
  margin-bottom: 20px;
  user-select: none;
}

.checkbox-field input[type="checkbox"] {
  display: none;
}

.checkbox-field__box {
  width: 18px;
  height: 18px;
  border-radius: 4px;
  border: 2px solid rgba(255,255,255,0.15);
  background: rgba(255,255,255,0.04);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 1px;
  transition: all 0.18s ease;
}

.checkbox-field__box svg {
  width: 10px;
  height: 10px;
  color: var(--primary);
  opacity: 0;
  transition: opacity 0.18s ease;
}

.checkbox-field input[type="checkbox"]:checked ~ .checkbox-field__box {
  background: var(--accent);
  border-color: var(--accent);
}

.checkbox-field input[type="checkbox"]:checked ~ .checkbox-field__box svg {
  opacity: 1;
}

.checkbox-field__label {
  font-size: 0.8375rem;
  color: var(--muted);
  line-height: 1.5;
}

.checkbox-field__label a { color: var(--accent); }
.checkbox-field__label a:hover { color: var(--accent-light); }

/* ============================================================
   20. OTP Input Grid
   ============================================================ */
.otp-grid {
  display: flex;
  gap: 10px;
  justify-content: center;
  margin: 28px 0;
}

.otp-input {
  width: 52px;
  height: 60px;
  border-radius: var(--radius-md);
  background: rgba(255,255,255,0.04);
  border: 1.5px solid rgba(255,255,255,0.08);
  color: var(--text);
  font-family: var(--font-base);
  font-size: 1.375rem;
  font-weight: 700;
  text-align: center;
  outline: none;
  caret-color: var(--accent);
  transition: all var(--transition);
  -webkit-appearance: none;
  appearance: none;
}

.otp-input:focus {
  border-color: var(--accent);
  background: rgba(201,168,76,0.06);
  box-shadow: var(--shadow-gold);
}

.otp-input.filled {
  border-color: rgba(201,168,76,0.40);
  color: var(--accent);
}

/* ============================================================
   21. Step Navigation Buttons
   ============================================================ */
.step-nav {
  display: flex;
  gap: 12px;
  margin-top: 24px;
}

.btn--ghost {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  color: var(--text-secondary);
  font-size: 0.9375rem;
  font-weight: 500;
  padding: 15px 24px;
  border-radius: var(--radius-md);
  transition: all var(--transition);
}

.btn--ghost:hover {
  background: rgba(255,255,255,0.07);
  border-color: rgba(255,255,255,0.14);
  color: var(--text);
}

.step-nav .btn--primary { flex: 1; }
.step-nav .btn--ghost   { width: auto; min-width: 100px; }

/* ============================================================
   22. OTP helper text
   ============================================================ */
.otp-hint {
  text-align: center;
  font-size: 0.875rem;
  color: var(--muted);
  line-height: 1.6;
  margin-bottom: 8px;
}

.otp-hint strong {
  color: var(--text-secondary);
  font-weight: 600;
}

.resend-link {
  display: block;
  text-align: center;
  font-size: 0.8125rem;
  color: var(--muted);
  margin-top: 16px;
}

.resend-link button {
  color: var(--accent);
  font-weight: 500;
  font-size: 0.8125rem;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  transition: color var(--transition);
}

.resend-link button:hover { color: var(--accent-light); }

/* ============================================================
   23. Success / Confetti layer
   ============================================================ */
.success-overlay {
  position: fixed;
  inset: 0;
  z-index: 999;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: rgba(10, 14, 26, 0.92);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s ease;
}

.success-overlay.visible {
  opacity: 1;
  pointer-events: all;
}

.success-overlay__icon {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--primary);
  animation: successPop 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

.success-overlay__icon svg {
  width: 40px;
  height: 40px;
}

.success-overlay h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
  letter-spacing: -0.02em;
}

.success-overlay p {
  font-size: 0.9375rem;
  color: var(--muted);
}

@keyframes successPop {
  from { transform: scale(0.4); opacity: 0; }
  to   { transform: scale(1);   opacity: 1; }
}

/* Confetti particle */
.confetti-particle {
  position: fixed;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  pointer-events: none;
  z-index: 1000;
}

/* ============================================================
   24. Shake animation (invalid submit)
   ============================================================ */
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  15%       { transform: translateX(-8px); }
  30%       { transform: translateX(8px); }
  45%       { transform: translateX(-6px); }
  60%       { transform: translateX(6px); }
  75%       { transform: translateX(-3px); }
  90%       { transform: translateX(3px); }
}

.shake { animation: shake 0.5s cubic-bezier(0.36, 0.07, 0.19, 0.97); }

/* ============================================================
   25. Section header inside signup card
   ============================================================ */
.signup-header {
  margin-bottom: 28px;
}

.signup-header h2 {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text);
  margin-bottom: 5px;
}

.signup-header p {
  font-size: 0.875rem;
  color: var(--muted);
}

/* ============================================================
   26. Top nav bar on signup
   ============================================================ */
.auth-topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10;
  padding: 20px 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.auth-topbar__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.auth-topbar__logo-icon {
  width: 34px;
  height: 34px;
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
}

.auth-topbar__logo-icon svg { width: 18px; height: 18px; }

.auth-topbar__logo-text {
  font-size: 1.125rem;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.03em;
}

.auth-topbar__logo-text span { color: var(--accent); }

.auth-topbar__link {
  font-size: 0.875rem;
  color: var(--muted);
}

.auth-topbar__link a { color: var(--accent); font-weight: 500; }
.auth-topbar__link a:hover { color: var(--accent-light); }

/* ============================================================
   27. Responsive — Tablet & Mobile
   ============================================================ */
@media (max-width: 900px) {
  .auth-split {
    grid-template-columns: 1fr;
  }

  .auth-canvas-panel {
    display: none;
  }

  .auth-form-panel {
    min-height: 100vh;
    padding: 32px 20px;
    /* canvas behind on mobile for login */
    position: relative;
  }

  .auth-card {
    padding: 36px 28px;
  }
}

@media (max-width: 600px) {
  .auth-card {
    padding: 28px 20px;
    border-radius: var(--radius-lg);
  }

  .signup-card {
    padding: 32px 24px;
    border-radius: var(--radius-lg);
  }

  .oauth-grid {
    grid-template-columns: 1fr;
  }

  .fields-row {
    grid-template-columns: 1fr;
  }

  .auth-topbar {
    padding: 16px 20px;
  }

  .otp-grid { gap: 8px; }
  .otp-input { width: 44px; height: 54px; font-size: 1.25rem; }

  .step-progress__label { display: none; }
}

/* Login page mobile: show canvas behind form */
@media (max-width: 900px) {
  .auth-split .auth-canvas-panel {
    display: block;
    position: fixed;
    inset: 0;
    opacity: 0.25;
    z-index: 0;
  }

  .auth-form-panel {
    position: relative;
    z-index: 1;
    background: rgba(17, 24, 39, 0.88);
    backdrop-filter: blur(8px);
  }
}