:root {
    --amber: #F97316;
    --amber-dark: #EA580C;
    --amber-glow: rgba(249,115,22,0.15);
    --black: #0A0A0A;
    --charcoal: #1A1A1A;
    --graphite: #2D2D2D;
    --white: #FFFFFF;
    --radius-sm: 8px;
    --radius-md: 10px;
    --radius-lg: 20px;
    --transition-fast: 0.15s ease;
    --transition-base: 0.25s ease;
    --transition-slow: 0.4s ease;
  }

  *, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }
  html, body { height:100%; }
  body {
    font-family: 'DM Sans', sans-serif;
    background: var(--black);
    color: var(--white);
    display: flex;
    min-height: 100vh;
  }

  /* ─── LEFT PANEL ─── */
  .left-panel {
    width: 44%;
    background: var(--charcoal);
    display: flex;
    flex-direction: column;
    padding: 48px 56px;
    position: relative;
    overflow: hidden;
  }

  .left-panel::before {
    content: '';
    position: absolute;
    width: 500px; height: 500px;
    border-radius: 50%;
    background: radial-gradient(circle, var(--amber-glow) 0%, transparent 70%);
    top: -100px; right: -100px;
    pointer-events: none;
  }

  .panel-grid {
    position: absolute; inset: 0;
    background-image:
      linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
      linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
    background-size: 48px 48px;
    pointer-events: none;
  }

  .brand {
    font-family: 'Syne', sans-serif;
    font-weight: 800;
    font-size: 26px;
    letter-spacing: -1px;
    text-decoration: none;
    color: var(--white);
    position: relative;
    z-index: 1;
    display: inline-block;
    transition: opacity var(--transition-fast);
  }
  .brand:hover { opacity: 0.85; }
  .brand .ova { color: var(--amber); }

  .panel-content { flex:1; display:flex; flex-direction:column; justify-content:center; position:relative; z-index:1; }

  /* Trial Hero */
  .trial-hero {
    background: linear-gradient(135deg, var(--amber) 0%, var(--amber-dark) 100%);
    border-radius: var(--radius-lg);
    padding: 32px 28px;
    margin-bottom: 32px;
    position: relative;
    overflow: hidden;
  }

  .trial-hero::before {
    content: '';
    position: absolute;
    width: 200px; height: 200px;
    border-radius: 50%;
    background: rgba(255,255,255,0.1);
    top: -60px; right: -60px;
  }

  .trial-badge {
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: rgba(0,0,0,0.5);
    margin-bottom: 12px;
  }

  .trial-amount {
    font-family: 'Syne', sans-serif;
    font-weight: 800;
    font-size: 48px;
    color: var(--black);
    letter-spacing: -2px;
    line-height: 1;
    margin-bottom: 4px;
  }

  .trial-period {
    font-size: 16px;
    color: rgba(0,0,0,0.5);
    font-weight: 500;
    margin-bottom: 20px;
  }

  .trial-then {
    font-size: 14px;
    color: rgba(0,0,0,0.55);
    padding-top: 16px;
    border-top: 1px solid rgba(0,0,0,0.15);
  }

  .trial-then strong { color: var(--black); font-weight: 700; font-size: 16px; }

  /* What's Included */
  .panel-eyebrow {
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 4px;
    text-transform: uppercase;
    color: var(--amber);
    margin-bottom: 16px;
  }

  .includes-list { list-style: none; display: flex; flex-direction: column; gap: 12px; }

  .includes-item {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 14px;
    color: rgba(255,255,255,0.65);
  }

  .includes-icon {
    width: 32px; height: 32px;
    background: rgba(249,115,22,0.1);
    border: 1px solid rgba(249,115,22,0.2);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 15px;
    flex-shrink: 0;
  }

  .panel-footer {
    position: relative;
    z-index: 1;
    font-size: 12px;
    color: rgba(255,255,255,0.25);
  }

  /* ─── RIGHT PANEL ─── */
  .right-panel {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px;
    background: var(--black);
    overflow-y: auto;
  }

  .form-container {
    width: 100%;
    max-width: 460px;
    padding: 8px 0;
  }

  .form-title {
    font-family: 'Syne', sans-serif;
    font-weight: 700;
    font-size: 28px;
    letter-spacing: -1px;
    margin-bottom: 8px;
  }

  .form-subtitle {
    font-size: 14px;
    color: rgba(255,255,255,0.45);
    margin-bottom: 32px;
    line-height: 1.6;
  }
  .form-subtitle a { color: var(--amber); text-decoration: none; font-weight: 500; transition: color var(--transition-fast); }
  .form-subtitle a:hover { color: var(--amber-dark); }

  /* ─── FORM FIELDS ─── */
  .field-group { margin-bottom: 20px; }

  label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: rgba(255,255,255,0.65);
    margin-bottom: 8px;
  }

  .input-wrap { position: relative; }

  .input-icon {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 15px;
    opacity: 0.4;
    pointer-events: none;
    transition: opacity var(--transition-fast);
  }

  .input-wrap:focus-within .input-icon { opacity: 0.7; }

  input, select {
    width: 100%;
    background: var(--charcoal);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius-md);
    padding: 13px 14px 13px 42px;
    font-family: 'DM Sans', sans-serif;
    font-size: 14px;
    color: var(--white);
    outline: none;
    transition: border-color var(--transition-base), box-shadow var(--transition-base);
    -webkit-appearance: none;
  }

  select { padding-left: 42px; cursor: pointer; }
  input::placeholder { color: rgba(255,255,255,0.25); }

  input:-webkit-autofill, select:-webkit-autofill {
    -webkit-text-fill-color: var(--white);
    -webkit-box-shadow: 0 0 0 1000px var(--charcoal) inset;
    transition: background-color 5000s ease-in-out 0s;
  }

  input:-webkit-autofill ~ .input-icon {
    opacity: 0.7;
  }

  input:autofill, select:autofill {
    background-color: var(--charcoal);
    color: var(--white);
  }

  input:focus, select:focus {
    border-color: var(--amber);
    box-shadow: 0 0 0 3px rgba(249,115,22,0.1);
  }

  input:focus-visible {
    outline: 2px solid var(--amber);
    outline-offset: 2px;
  }

  input:valid:not(:placeholder-shown):not(.input-error) {
    border-color: rgba(74,222,128,0.3);
  }

  /* Inline field error */
  input.input-error {
    border-color: rgba(248,113,113,0.5);
    box-shadow: 0 0 0 3px rgba(248,113,113,0.1);
  }

  .field-error {
    font-size: 12px;
    color: #fca5a5;
    margin-top: 6px;
    display: flex;
    align-items: center;
    gap: 4px;
    animation: alertSlideIn var(--transition-fast) ease-out;
  }

  .input-toggle {
    position: absolute;
    right: 14px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: rgba(255,255,255,0.3);
    cursor: pointer;
    font-size: 16px;
    padding: 4px;
    border-radius: 4px;
    transition: color var(--transition-fast), background var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 28px;
    min-height: 28px;
  }
  .input-toggle:hover { color: rgba(255,255,255,0.7); background: rgba(255,255,255,0.05); }
  .input-toggle:focus-visible { outline: 2px solid var(--amber); outline-offset: 2px; }

  .field-hint { font-size: 11px; color: rgba(255,255,255,0.3); margin-top: 6px; }

  /* ─── PASSWORD STRENGTH ─── */
  .password-strength { margin-top: 10px; }
  .strength-bars { display: flex; gap: 4px; margin-bottom: 6px; }

  .strength-bar {
    flex: 1;
    height: 3px;
    border-radius: 100px;
    background: rgba(255,255,255,0.08);
    transition: background var(--transition-base), transform var(--transition-fast);
  }

  .strength-bar.active { transform: scaleY(1.3); }

  .strength-bar.s1 { background: #f87171; }
  .strength-bar.s2 { background: #facc15; }
  .strength-bar.s3 { background: #4ade80; }
  .strength-bar.s4 { background: #22c55e; }

  .strength-label {
    font-size: 11px;
    color: rgba(255,255,255,0.3);
    transition: color var(--transition-fast);
  }
  .strength-label.weak { color: #f87171; }
  .strength-label.fair { color: #facc15; }
  .strength-label.good { color: #4ade80; }
  .strength-label.strong { color: #22c55e; }

  /* ─── TERMS ─── */
  .terms-check { margin-bottom: 24px; }

  .checkbox-wrap {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    cursor: pointer;
  }

  .checkbox-wrap input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--amber);
    cursor: pointer;
    padding: 0;
    margin-top: 2px;
    flex-shrink: 0;
    border-radius: 4px;
  }

  .checkbox-wrap input[type="checkbox"]:focus-visible {
    outline: 2px solid var(--amber);
    outline-offset: 2px;
  }

  .terms-text {
    font-size: 13px;
    color: rgba(255,255,255,0.5);
    line-height: 1.6;
  }
  .terms-text a { color: var(--amber); text-decoration: none; transition: color var(--transition-fast); }
  .terms-text a:hover { color: var(--amber-dark); }

  /* ─── SUBMIT BUTTON ─── */
  .submit-btn {
    width: 100%;
    background: var(--amber);
    color: var(--black);
    border: none;
    border-radius: var(--radius-md);
    padding: 16px;
    font-family: 'Syne', sans-serif;
    font-size: 16px;
    font-weight: 800;
    letter-spacing: -0.3px;
    cursor: pointer;
    transition: background var(--transition-fast), transform var(--transition-fast), opacity var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    position: relative;
    min-height: 52px;
  }

  .submit-btn:hover:not(:disabled) {
    background: var(--amber-dark);
    color: var(--white);
    transform: translateY(-1px);
  }

  .submit-btn:active:not(:disabled) { transform: translateY(0); }

  .submit-btn:focus-visible {
    outline: 2px solid var(--white);
    outline-offset: 2px;
  }

  .submit-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
  }

  /* Loading spinner */
  .submit-btn .spinner {
    display: none;
    width: 18px;
    height: 18px;
    border: 2px solid rgba(0,0,0,0.2);
    border-top-color: var(--black);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
  }

  .submit-btn.loading .spinner { display: block; }
  .submit-btn.loading .btn-text { opacity: 0.7; }

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

  .form-note {
    margin-top: 16px;
    text-align: center;
    font-size: 12px;
    color: rgba(255,255,255,0.25);
  }

  /* ─── ACCOUNT EXISTS BANNER ─── */
  .account-exists-banner {
    background: rgba(249,115,22,0.08);
    border: 1px solid rgba(249,115,22,0.2);
    border-radius: var(--radius-md);
    padding: 16px;
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 12px;
    animation: alertSlideIn var(--transition-base) ease-out;
  }

  .account-exists-banner .banner-icon {
    font-size: 20px;
    flex-shrink: 0;
  }

  .account-exists-banner .banner-text {
    font-size: 13px;
    color: rgba(255,255,255,0.7);
    line-height: 1.5;
  }

  .account-exists-banner { display: none; }
  .account-exists-banner .banner-text a {
    color: var(--amber);
    font-weight: 600;
    text-decoration: none;
  }

  /* ─── RESPONSIVE ─── */
  @media (max-width: 900px) {
    .left-panel {
      width: 38%;
      padding: 32px 28px;
    }

    .right-panel { padding: 32px 24px; }

    .trial-amount { font-size: 36px; }
    .trial-hero { padding: 24px 20px; }
  }

  @media (max-width: 768px) {
    body { flex-direction: column; }

    .left-panel {
      width: 100%;
      padding: 20px 24px 16px;
      min-height: auto;
      max-height: none;
    }

    .left-panel::before {
      width: 300px;
      height: 300px;
      top: -80px;
      right: -80px;
    }

    .panel-grid { background-size: 32px 32px; }

    .panel-content {
      flex-direction: row;
      align-items: center;
      gap: 20px;
      justify-content: flex-start;
    }

    .trial-hero {
      margin-bottom: 0;
      padding: 16px 18px;
      min-width: 200px;
      flex-shrink: 0;
    }

    .trial-hero::before { display: none; }
    .trial-badge { font-size: 9px; letter-spacing: 2px; margin-bottom: 6px; }
    .trial-amount { font-size: 28px; letter-spacing: -1px; }
    .trial-period { font-size: 13px; margin-bottom: 8px; }
    .trial-then { font-size: 12px; padding-top: 8px; }
    .trial-then strong { font-size: 13px; }

    .panel-eyebrow { display: none; }
    .includes-list { display: none; }
    .panel-footer { display: none; }

    .right-panel {
      padding: 24px 20px 32px;
      align-items: flex-start;
    }

    .form-container { max-width: 100%; padding: 0; }

    .form-title { font-size: 24px; }
    .form-subtitle { margin-bottom: 24px; }

    .submit-btn { min-height: 48px; padding: 14px; font-size: 15px; }
  }

  @media (max-width: 480px) {
    .left-panel { padding: 16px 16px 12px; }

    .brand { font-size: 22px; }

    .panel-content { gap: 12px; }

    .trial-hero {
      padding: 12px 14px;
      min-width: 160px;
    }

    .trial-amount { font-size: 22px; }
    .trial-period { font-size: 11px; margin-bottom: 6px; }
    .trial-then { font-size: 10px; padding-top: 6px; }
    .trial-then strong { font-size: 11px; }

    .right-panel { padding: 20px 16px 28px; }

    .form-title { font-size: 20px; }

    input, select { padding: 12px 12px 12px 38px; font-size: 16px; } /* 16px prevents iOS zoom */
    .input-icon { left: 12px; font-size: 14px; }

    .submit-btn { min-height: 44px; padding: 12px; font-size: 14px; }
  }

  /* ─── REDUCED MOTION ─── */
  @media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
      animation-duration: 0.01ms !important;
      animation-iteration-count: 1 !important;
      transition-duration: 0.01ms !important;
    }
  }