:root {
  color-scheme: dark;
  --bg-deep: #08090d;
  --card-bg: #ffffff;
  --card-text: #0f172a;
  --card-text-muted: #64748b;
  --card-border: #e2e8f0;
  --card-input-bg: #f8fafc;
  --primary: #dc2626;
  --primary-hover: #b91c1c;
  --primary-glow: rgba(220, 38, 38, 0.35);
  --gradient-overlay: linear-gradient(135deg, #ef4444 0%, #dc2626 50%, #991b1b 100%);
  --font: 'Inter', ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

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

body.auth-body {
  min-height: 100vh;
  min-height: 100dvh;
  font-family: var(--font);
  background:
    radial-gradient(circle at 50% 20%, rgba(239, 68, 68, 0.18), transparent 30rem),
    radial-gradient(circle at 80% 80%, rgba(220, 38, 38, 0.14), transparent 25rem),
    linear-gradient(150deg, #07080b, #0c0f17 55%, #08090d);
  display: grid;
  place-items: center;
  padding: 24px 16px;
  color: var(--card-text);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ══════════════════════════════════════════════════════════
   SMOOTH AUTHENTICATION PANEL TURN (Code Candy 3D Engine)
   ══════════════════════════════════════════════════════════ */

.auth-card {
  width: min(920px, 94vw);
  min-height: 610px;
  background: var(--card-bg);
  border-radius: 28px;
  box-shadow:
    0 25px 80px rgba(0, 0, 0, 0.6),
    0 4px 20px rgba(0, 0, 0, 0.25),
    inset 0 1px 0 rgba(255, 255, 255, 0.8);
  position: relative;
  overflow: hidden;
  display: flex;
  perspective: 1500px;
}

/* Form panels */
.auth-panel {
  width: 50%;
  padding: 44px 42px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
  z-index: 2;
  transition: opacity 0.4s ease, transform 0.4s ease;
}

.auth-panel.sign-in-panel {
  order: 1;
}

.auth-panel.sign-up-panel {
  order: 2;
}

/* Wordmark & Headers */
.auth-header {
  margin-bottom: 24px;
}

.auth-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 18px;
  text-decoration: none;
}

.brand-icon {
  width: 32px;
  height: 32px;
  border-radius: 9px;
  background: var(--gradient-overlay);
  display: grid;
  place-items: center;
  color: #fff;
  font-weight: 800;
  font-size: 15px;
  box-shadow: 0 4px 14px rgba(220, 38, 38, 0.45);
}

.brand-title {
  font-size: 17px;
  font-weight: 750;
  color: #0f172a;
  letter-spacing: -0.02em;
}

.brand-title .gradient-text {
  background: linear-gradient(90deg, #ef4444, #b91c1c);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.auth-tag {
  display: inline-block;
  font-size: 10px;
  font-weight: 750;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #dc2626;
  margin-bottom: 6px;
}

.auth-title {
  font-size: 26px;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: #0f172a;
  margin-bottom: 6px;
}

.auth-desc {
  font-size: 13px;
  color: var(--card-text-muted);
  line-height: 1.5;
}

/* Inputs with internal icons */
.auth-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.input-field-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.input-label {
  font-size: 12.5px;
  font-weight: 600;
  color: #334155;
}

.input-control-wrap {
  position: relative;
  display: flex;
  align-items: center;
}

.control-icon {
  position: absolute;
  left: 14px;
  color: #94a3b8;
  pointer-events: none;
  display: flex;
  align-items: center;
}

.auth-input {
  width: 100%;
  height: 44px;
  padding: 0 14px 0 42px;
  background: var(--card-input-bg);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  font-family: var(--font);
  font-size: 13.5px;
  color: #0f172a;
  outline: none;
  transition: all 0.2s ease;
}

.auth-input::placeholder {
  color: #94a3b8;
}

.auth-input:hover {
  border-color: #cbd5e1;
}

.auth-input:focus {
  background: #ffffff;
  border-color: #6366f1;
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.18);
}

.pwd-toggle-btn {
  position: absolute;
  right: 12px;
  background: none;
  border: none;
  cursor: pointer;
  color: #94a3b8;
  display: flex;
  align-items: center;
  padding: 4px;
}

.pwd-toggle-btn:hover {
  color: #475569;
}

/* Secondary options */
.auth-options-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12.5px;
  margin-top: 2px;
}

.auth-checkbox-label {
  display: flex;
  align-items: center;
  gap: 8px;
  color: #475569;
  cursor: pointer;
}

.auth-checkbox-label input {
  accent-color: var(--primary);
  width: 15px;
  height: 15px;
}

.auth-forgot-link {
  color: #4f46e5;
  text-decoration: none;
  font-weight: 600;
}

.auth-forgot-link:hover {
  text-decoration: underline;
}

/* Primary Action Button */
.auth-submit-btn {
  height: 46px;
  border-radius: 12px;
  border: none;
  background: var(--primary);
  color: #ffffff;
  font-family: var(--font);
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 4px 14px var(--primary-glow);
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: 4px;
}

.auth-submit-btn:hover {
  background: var(--primary-hover);
  box-shadow: 0 6px 20px rgba(79, 70, 229, 0.45);
  transform: translateY(-1px);
}

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

/* Divider */
.auth-divider {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 18px 0 14px;
  color: #94a3b8;
  font-size: 11.5px;
}

.auth-divider::before, .auth-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: #e2e8f0;
}

/* SSO buttons */
.sso-button-row {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 10px;
}

.sso-btn {
  height: 40px;
  border-radius: 10px;
  border: 1px solid #e2e8f0;
  background: #ffffff;
  color: #334155;
  font-size: 12.5px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.2s ease;
}

.sso-btn:hover {
  background: #f8fafc;
  border-color: #cbd5e1;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.sso-btn.sso-google {
  grid-column: span 3;
  height: 42px;
}

/* ══════════════════════════════════════════════════════════
   THE 3D OVERLAY PANEL
   ══════════════════════════════════════════════════════════ */

.auth-overlay {
  position: absolute;
  top: 0;
  right: 0;
  width: 50%;
  height: 100%;
  background: var(--gradient-overlay);
  z-index: 10;
  color: #ffffff;
  padding: 48px 44px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  transform-style: preserve-3d;
  backface-visibility: hidden;
  will-change: transform;
  box-shadow: 0 0 50px rgba(0, 0, 0, 0.2);
}

/* Turn animation keyframes from TikTok video */
.auth-card.show-signup .auth-overlay {
  animation: turn-left 860ms cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.auth-card.show-signin .auth-overlay {
  animation: turn-right 860ms cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes turn-left {
  0%   { transform: translate3d(0, 0, 0) rotateY(0); }
  20%  { transform: translate3d(-10%, 0, 0) rotateY(-2.6deg); }
  50%  { transform: translate3d(-50%, 0, 0) rotateY(-4.5deg); }
  80%  { transform: translate3d(-90%, 0, 0) rotateY(-2.6deg); }
  100% { transform: translate3d(-100%, 0, 0) rotateY(0); }
}

@keyframes turn-right {
  0%   { transform: translate3d(-100%, 0, 0) rotateY(0); }
  20%  { transform: translate3d(-90%, 0, 0) rotateY(2.6deg); }
  50%  { transform: translate3d(-50%, 0, 0) rotateY(4.5deg); }
  80%  { transform: translate3d(-10%, 0, 0) rotateY(2.6deg); }
  100% { transform: translate3d(0, 0, 0) rotateY(0); }
}

/* Content inside overlay */
.overlay-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  max-width: 320px;
  transition: opacity 0.3s ease;
}

.overlay-signup-view {
  display: none;
}

.auth-card.show-signup .overlay-signin-view {
  display: none;
}

.auth-card.show-signup .overlay-signup-view {
  display: flex;
}

/* Floating 3D card illustration */
.overlay-badge-card {
  width: 140px;
  height: 96px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.16);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid rgba(255, 255, 255, 0.35);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.15);
  display: grid;
  place-items: center;
  position: relative;
  margin-bottom: 28px;
  transform: translateY(-4px);
}

.overlay-avatar-icon {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.95);
  color: #4f46e5;
  display: grid;
  place-items: center;
}

.overlay-floating-chip {
  position: absolute;
  top: 10px;
  left: 12px;
  width: 22px;
  height: 22px;
  border-radius: 6px;
  background: #22c55e;
  color: #fff;
  display: grid;
  place-items: center;
  box-shadow: 0 2px 8px rgba(34, 197, 94, 0.4);
}

.overlay-floating-chip.plus {
  background: #3b82f6;
  right: 12px;
  left: auto;
}

.overlay-tag {
  font-size: 10.5px;
  font-weight: 750;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 8px;
}

.overlay-title {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 12px;
}

.overlay-desc {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.85);
  line-height: 1.6;
  margin-bottom: 28px;
}

.overlay-pill-btn {
  padding: 11px 26px;
  border-radius: 999px;
  border: 1.5px solid rgba(255, 255, 255, 0.6);
  background: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(8px);
  color: #ffffff;
  font-family: var(--font);
  font-size: 13.5px;
  font-weight: 700;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all 0.25s ease;
}

.overlay-pill-btn:hover {
  background: #ffffff;
  color: #4f46e5;
  border-color: #ffffff;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
  transform: translateY(-2px);
}

.overlay-footer-note {
  margin-top: 24px;
  font-size: 11.5px;
  color: rgba(255, 255, 255, 0.7);
}

/* Security Alert Banner */
.auth-alert {
  padding: 12px 14px;
  border-radius: 12px;
  font-size: 13px;
  line-height: 1.45;
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 18px;
}

.auth-alert.error {
  background: #fef2f2;
  border: 1px solid #fecaca;
  color: #dc2626;
}

.auth-alert.success {
  background: #f0fdf4;
  border: 1px solid #bbf7d0;
  color: #16a34a;
}

/* Responsive Handling */
@media (max-width: 820px) {
  .auth-card {
    width: 100%;
    min-height: auto;
    flex-direction: column;
    border-radius: 22px;
  }
  .auth-overlay {
    display: none !important;
  }
  .auth-panel {
    width: 100%;
    padding: 36px 24px;
  }
  .auth-panel.sign-up-panel {
    display: none;
  }
  .auth-card.show-signup .auth-panel.sign-in-panel {
    display: none;
  }
  .auth-card.show-signup .auth-panel.sign-up-panel {
    display: flex;
  }
  .mobile-toggle-footer {
    display: block !important;
    text-align: center;
    margin-top: 20px;
    font-size: 13px;
    color: #64748b;
  }
  .mobile-toggle-footer button {
    background: none;
    border: none;
    color: #4f46e5;
    font-weight: 700;
    cursor: pointer;
  }
}

.mobile-toggle-footer {
  display: none;
}