/* ── Star field ── */
    .starfield {
      position: fixed;
      inset: 0;
      z-index: 0;
      overflow: hidden;
      pointer-events: none;
    }

    .starfield::before,
    .starfield::after {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 2px;
      height: 2px;
      border-radius: 50%;
      background: transparent;
      animation: twinkle 6s linear infinite;
    }

    .starfield::before {
      box-shadow:
        120px 45px 0 rgba(255,255,255,0.7),
        340px 120px 0 rgba(122,145,255,0.6),
        560px 80px 0 rgba(255,255,255,0.5),
        780px 200px 0 rgba(0,229,200,0.5),
        920px 60px 0 rgba(255,255,255,0.8),
        1100px 150px 0 rgba(122,145,255,0.4),
        1280px 30px 0 rgba(255,255,255,0.6),
        60px 280px 0 rgba(0,229,200,0.4),
        240px 350px 0 rgba(255,255,255,0.5),
        480px 420px 0 rgba(79,107,255,0.6),
        700px 310px 0 rgba(255,255,255,0.7),
        860px 380px 0 rgba(122,145,255,0.5),
        1040px 290px 0 rgba(0,229,200,0.3),
        1200px 400px 0 rgba(255,255,255,0.6),
        180px 520px 0 rgba(255,255,255,0.4),
        400px 570px 0 rgba(79,107,255,0.5),
        620px 500px 0 rgba(255,255,255,0.7),
        50px 650px 0 rgba(122,145,255,0.3),
        300px 700px 0 rgba(0,229,200,0.4);
      animation-delay: 0s;
    }

    .starfield::after {
      box-shadow:
        80px 160px 0 rgba(255,255,255,0.5),
        300px 250px 0 rgba(0,229,200,0.6),
        520px 180px 0 rgba(122,145,255,0.5),
        740px 90px 0 rgba(255,255,255,0.7),
        960px 230px 0 rgba(79,107,255,0.4),
        1140px 340px 0 rgba(255,255,255,0.6),
        160px 440px 0 rgba(122,145,255,0.4),
        380px 490px 0 rgba(255,255,255,0.5),
        600px 410px 0 rgba(0,229,200,0.5),
        820px 470px 0 rgba(255,255,255,0.7),
        1000px 350px 0 rgba(79,107,255,0.5),
        1180px 460px 0 rgba(122,145,255,0.3),
        50px 600px 0 rgba(255,255,255,0.4),
        270px 650px 0 rgba(0,229,200,0.4),
        490px 620px 0 rgba(255,255,255,0.6),
        710px 590px 0 rgba(79,107,255,0.3),
        930px 640px 0 rgba(255,255,255,0.5),
        1150px 610px 0 rgba(122,145,255,0.4);
      animation-delay: 3s;
    }

    @keyframes twinkle {
      0%, 100% { opacity: 1; }
      50% { opacity: 0.3; }
    }

    /* ── Nebula orbs ── */
    .nebula {
      position: fixed;
      inset: 0;
      z-index: 0;
      pointer-events: none;
      overflow: hidden;
    }

    .nebula-orb {
      position: absolute;
      border-radius: 50%;
      filter: blur(80px);
      opacity: 0.1;
    }

    .nebula-orb--1 {
      width: 700px;
      height: 700px;
      top: -250px;
      right: -200px;
      background: radial-gradient(circle, #4F6BFF, transparent);
      animation: tn-float 14s ease-in-out infinite;
    }

    .nebula-orb--2 {
      width: 500px;
      height: 500px;
      bottom: -150px;
      left: -120px;
      background: radial-gradient(circle, #00E5C8, transparent);
      animation: tn-float 10s ease-in-out infinite reverse;
    }

    /* ── Page layout ── */
    .reg-page {
      position: relative;
      z-index: 1;
      min-height: 100vh;
      display: flex;
      flex-direction: column;
      align-items: center;
      padding: var(--tn-space-10) var(--tn-space-4) var(--tn-space-16);
    }

    /* ── Logo area ── */
    .reg-logo-wrap {
      margin-bottom: var(--tn-space-8);
      display: flex;
      justify-content: center;
    }

    .reg-logo-wrap svg {
      height: 38px;
      width: auto;
    }

    /* ── Page headline ── */
    .reg-headline {
      font-family: var(--tn-font-heading);
      font-size: var(--tn-text-2xl);
      font-weight: 700;
      color: var(--tn-text-on-dark);
      text-align: center;
      margin-bottom: var(--tn-space-2);
    }

    .reg-subtext {
      font-size: var(--tn-text-sm);
      color: var(--tn-text-sub);
      text-align: center;
      margin-bottom: var(--tn-space-5);
    }

    /* ── Free badge ── */
    .free-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: rgba(0, 229, 200, 0.12);
      border: 1px solid rgba(0, 229, 200, 0.3);
      border-radius: var(--tn-radius-full);
      padding: 6px 16px;
      font-size: var(--tn-text-xs);
      font-weight: 700;
      font-family: var(--tn-font-heading);
      color: var(--tn-accent);
      letter-spacing: 0.03em;
      margin-bottom: var(--tn-space-6);
    }

    /* ── Step indicator ── */
    .step-indicator {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: var(--tn-space-2);
      margin-bottom: var(--tn-space-6);
      width: 100%;
      max-width: 560px;
    }

    .step-node {
      display: flex;
      align-items: center;
      gap: var(--tn-space-2);
      font-family: var(--tn-font-heading);
      font-size: var(--tn-text-xs);
      font-weight: 600;
      color: var(--tn-text-muted);
      transition: color var(--tn-dur-normal);
    }

    .step-num {
      width: 28px;
      height: 28px;
      border-radius: 50%;
      background: var(--tn-surface-2);
      border: 1.5px solid var(--tn-border);
      display: grid;
      place-items: center;
      font-size: var(--tn-text-xs);
      font-weight: 700;
      color: var(--tn-text-muted);
      transition: all var(--tn-dur-normal) var(--tn-ease-out);
      flex-shrink: 0;
    }

    .step-node.active .step-num {
      background: var(--tn-primary);
      border-color: var(--tn-primary);
      color: #fff;
      box-shadow: 0 4px 14px rgba(79, 107, 255, 0.45);
    }

    .step-node.active {
      color: var(--tn-text);
    }

    .step-node.done .step-num {
      background: var(--tn-success);
      border-color: var(--tn-success);
      color: #fff;
    }

    .step-node.done {
      color: var(--tn-success);
    }

    /* Progress bar connector */
    .step-bar {
      flex: 1;
      max-width: 60px;
      height: 2px;
      background: var(--tn-border-subtle);
      border-radius: 2px;
      overflow: hidden;
      position: relative;
    }

    .step-bar-fill {
      position: absolute;
      left: 0;
      top: 0;
      height: 100%;
      width: 0%;
      background: var(--tn-primary);
      border-radius: 2px;
      transition: width var(--tn-dur-slow) var(--tn-ease-out);
    }
    .step-bar-fill--complete {
      width: 100%;
    }

    /* ── Card ── */
    .reg-card {
      position: relative;
      width: 100%;
      max-width: 560px;
      background: var(--tn-grad-card);
      border: 1px solid var(--tn-border);
      border-radius: var(--tn-radius-xl);
      padding: var(--tn-space-10) var(--tn-space-8);
      box-shadow: var(--tn-shadow-lg), 0 0 0 1px rgba(79,107,255,0.06);
      overflow: hidden;
      transition: box-shadow var(--tn-dur-slow) var(--tn-ease-out),
                  border-color var(--tn-dur-slow) var(--tn-ease-out);
    }

    .reg-card:focus-within {
      border-color: rgba(79,107,255,0.3);
      box-shadow: var(--tn-shadow-lg), var(--tn-shadow-glow);
    }

    .registration-step--hidden {
      display: none;
    }

    /* Noise texture */
    .reg-card::after {
      content: '';
      position: absolute;
      inset: 0;
      background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.04'/%3E%3C/svg%3E");
      pointer-events: none;
      border-radius: inherit;
    }

    /* Top glow */
    .reg-card::before {
      content: '';
      position: absolute;
      top: 0;
      left: 15%;
      right: 15%;
      height: 1px;
      background: linear-gradient(90deg, transparent, var(--tn-primary), transparent);
      z-index: 1;
    }

    .card-step-title {
      font-family: var(--tn-font-heading);
      font-size: var(--tn-text-lg);
      font-weight: 700;
      color: var(--tn-text-on-dark);
      margin-bottom: var(--tn-space-2);
    }

    .card-step-desc {
      font-size: var(--tn-text-sm);
      color: var(--tn-text-sub);
      margin-bottom: var(--tn-space-6);
      line-height: 1.6;
    }

    /* ── Error banner ── */
    .error-banner {
      display: none;
      align-items: flex-start;
      gap: var(--tn-space-2);
      background: rgba(255, 92, 107, 0.12);
      border: 1px solid rgba(255, 92, 107, 0.35);
      border-radius: var(--tn-radius-md);
      padding: var(--tn-space-3) var(--tn-space-4);
      margin-bottom: var(--tn-space-5);
      color: #FF8A95;
      font-size: var(--tn-text-sm);
      animation: slideInDown 0.25s var(--tn-ease-out);
    }

    .error-banner.visible {
      display: flex;
    }

    @keyframes slideInDown {
      from { opacity: 0; transform: translateY(-8px); }
      to { opacity: 1; transform: translateY(0); }
    }

    /* ── Form fields ── */
    .field {
      margin-bottom: var(--tn-space-5);
    }

    .field-label {
      display: block;
      font-family: var(--tn-font-heading);
      font-size: var(--tn-text-sm);
      font-weight: 600;
      color: var(--tn-text-sub);
      margin-bottom: var(--tn-space-2);
    }

    .field-hint {
      font-size: var(--tn-text-xs);
      color: var(--tn-text-muted);
      margin-top: var(--tn-space-2);
      line-height: 1.5;
    }

    .field-input {
      width: 100%;
      padding: 13px 16px;
      background: rgba(15, 22, 40, 0.6);
      border: 1.5px solid var(--tn-border);
      border-radius: var(--tn-radius-md);
      color: var(--tn-text);
      font-family: var(--tn-font-body);
      font-size: var(--tn-text-base);
      outline: none;
      transition: border-color var(--tn-dur-fast) var(--tn-ease-out),
                  box-shadow var(--tn-dur-fast) var(--tn-ease-out);
    }

    .field-input::placeholder {
      color: var(--tn-text-muted);
    }

    .field-input:focus {
      border-color: var(--tn-primary);
      box-shadow: 0 0 0 3px rgba(79, 107, 255, 0.2);
    }

    .field-input.ok {
      border-color: var(--tn-success);
    }

    .field-input.bad {
      border-color: var(--tn-danger);
    }

    /* ── Slug row ── */
    .slug-row {
      display: flex;
      align-items: stretch;
    }

    .slug-prefix {
      padding: 13px 12px;
      background: rgba(36, 49, 96, 0.8);
      border: 1.5px solid var(--tn-border);
      border-right: none;
      border-radius: var(--tn-radius-md) 0 0 var(--tn-radius-md);
      font-size: var(--tn-text-xs);
      font-family: var(--tn-font-mono);
      color: var(--tn-text-muted);
      white-space: nowrap;
      display: flex;
      align-items: center;
    }

    .slug-row .field-input {
      border-radius: 0 var(--tn-radius-md) var(--tn-radius-md) 0;
    }

    /* ── Slug status ── */
    .status-line {
      font-size: var(--tn-text-xs);
      margin-top: var(--tn-space-2);
      min-height: 18px;
      font-weight: 500;
    }

    .status-line.ok { color: var(--tn-success); }
    .status-line.bad { color: var(--tn-danger); }
    .status-line.checking { color: var(--tn-text-muted); }

    /* Slug preview URL */
    .slug-preview {
      font-size: var(--tn-text-xs);
      margin-top: var(--tn-space-2);
      color: var(--tn-text-muted);
      font-family: var(--tn-font-mono);
    }

    .slug-preview .preview-val {
      color: var(--tn-accent);
      font-weight: 600;
    }

    /* ── Password strength ── */
    .pw-strength-bar {
      display: flex;
      gap: 4px;
      margin-top: var(--tn-space-2);
    }

    .pw-strength-seg {
      flex: 1;
      height: 3px;
      border-radius: 2px;
      background: var(--tn-border-subtle);
      transition: background var(--tn-dur-normal);
    }

    .pw-strength-seg.weak { background: var(--tn-danger); }
    .pw-strength-seg.medium { background: var(--tn-warning); }
    .pw-strength-seg.strong { background: var(--tn-success); }

    .pw-strength-label {
      font-size: var(--tn-text-xs);
      color: var(--tn-text-muted);
      margin-top: 4px;
    }

    /* ── Password wrapper (toggle) ── */
    .pw-wrap {
      position: relative;
    }

    .pw-wrap .field-input {
      padding-right: 48px;
    }

    .password-toggle {
      position: absolute;
      right: 8px;
      top: 50%;
      transform: translateY(-50%);
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
      color: var(--tn-text-muted);
      border-radius: var(--tn-radius-sm);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: color var(--tn-dur-fast), background var(--tn-dur-fast);
    }

    .password-toggle:hover {
      color: var(--tn-primary-light);
      background: rgba(79,107,255,0.12);
    }

    .password-toggle svg {
      width: 18px;
      height: 18px;
    }

    /* ── Free note ── */
    .free-note {
      background: rgba(79, 107, 255, 0.08);
      border-left: 3px solid var(--tn-primary);
      border-radius: 0 var(--tn-radius-md) var(--tn-radius-md) 0;
      padding: var(--tn-space-3) var(--tn-space-4);
      margin-bottom: var(--tn-space-6);
      font-size: var(--tn-text-sm);
      color: var(--tn-text-sub);
      line-height: 1.6;
    }

    .free-note strong {
      color: var(--tn-primary-light);
    }

    /* ── Terms checkbox ── */
    .terms-row {
      display: flex;
      align-items: flex-start;
      gap: var(--tn-space-3);
      margin-bottom: var(--tn-space-5);
    }

    .terms-checkbox {
      width: 18px;
      height: 18px;
      flex-shrink: 0;
      margin-top: 2px;
      appearance: none;
      -webkit-appearance: none;
      background: rgba(15, 22, 40, 0.6);
      border: 1.5px solid var(--tn-border);
      border-radius: 5px;
      cursor: pointer;
      transition: all var(--tn-dur-fast);
      display: grid;
      place-items: center;
    }

    .terms-checkbox:checked {
      background: var(--tn-primary);
      border-color: var(--tn-primary);
    }

    .terms-checkbox:checked::after {
      content: '';
      width: 10px;
      height: 6px;
      border-left: 2px solid #fff;
      border-bottom: 2px solid #fff;
      transform: rotate(-45deg) translateY(-1px);
    }

    .terms-checkbox:focus-visible {
      outline: 2px solid var(--tn-primary);
      outline-offset: 2px;
    }

    .terms-label {
      font-size: var(--tn-text-sm);
      color: var(--tn-text-sub);
      line-height: 1.5;
      cursor: pointer;
    }

    .terms-label a {
      color: var(--tn-accent);
      text-decoration: underline;
      text-underline-offset: 2px;
    }

    /* ── Buttons ── */
    .btn-primary {
      width: 100%;
      padding: 14px;
      background: var(--tn-grad-primary);
      color: #fff;
      font-family: var(--tn-font-heading);
      font-weight: 700;
      font-size: var(--tn-text-base);
      border: none;
      border-radius: var(--tn-radius-md);
      cursor: pointer;
      box-shadow: 0 4px 20px rgba(79, 107, 255, 0.4);
      transition: transform var(--tn-dur-normal) var(--tn-ease-out),
                  box-shadow var(--tn-dur-normal) var(--tn-ease-out),
                  opacity var(--tn-dur-fast);
      display: flex;
      align-items: center;
      justify-content: center;
      gap: var(--tn-space-2);
      margin-top: var(--tn-space-2);
    }

    .btn-primary:hover:not(:disabled) {
      transform: translateY(-2px);
      box-shadow: 0 8px 32px rgba(79, 107, 255, 0.55);
    }

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

    .btn-primary:disabled {
      opacity: 0.5;
      cursor: not-allowed;
    }

    .btn-accent {
      width: 100%;
      padding: 14px;
      background: var(--tn-accent);
      color: #0B1020;
      font-family: var(--tn-font-heading);
      font-weight: 700;
      font-size: var(--tn-text-base);
      border: none;
      border-radius: var(--tn-radius-md);
      cursor: pointer;
      box-shadow: 0 4px 20px rgba(0, 229, 200, 0.35);
      transition: transform var(--tn-dur-normal) var(--tn-ease-out),
                  box-shadow var(--tn-dur-normal) var(--tn-ease-out),
                  opacity var(--tn-dur-fast);
      display: flex;
      align-items: center;
      justify-content: center;
      gap: var(--tn-space-2);
      margin-top: var(--tn-space-2);
    }

    .btn-accent:hover:not(:disabled) {
      transform: translateY(-2px);
      box-shadow: 0 8px 32px rgba(0, 229, 200, 0.5);
    }

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

    .btn-accent:disabled {
      opacity: 0.5;
      cursor: not-allowed;
    }

    .btn-secondary {
      width: 100%;
      padding: 12px;
      background: transparent;
      color: var(--tn-text-muted);
      font-family: var(--tn-font-heading);
      font-weight: 600;
      font-size: var(--tn-text-sm);
      border: 1.5px solid var(--tn-border);
      border-radius: var(--tn-radius-md);
      cursor: pointer;
      margin-top: var(--tn-space-3);
      transition: border-color var(--tn-dur-fast), color var(--tn-dur-fast), background var(--tn-dur-fast);
    }

    .btn-secondary:hover {
      border-color: var(--tn-primary);
      color: var(--tn-primary-light);
      background: rgba(79,107,255,0.06);
    }

    /* Spinner */
    .spinner {
      width: 16px;
      height: 16px;
      border: 2px solid rgba(0,0,0,0.2);
      border-top-color: #0B1020;
      border-radius: 50%;
      animation: spin 0.7s linear infinite;
      display: none;
    }

    .btn-accent.loading .spinner,
    .btn-primary.loading .spinner {
      display: block;
    }

    .btn-primary .spinner {
      border: 2px solid rgba(255,255,255,0.35);
      border-top-color: #fff;
    }

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

    /* ── Upgrade CTA ── */
    .upgrade-cta {
      margin-top: var(--tn-space-5);
      text-align: center;
      color: var(--tn-text-muted);
      font-size: var(--tn-text-xs);
    }

    .upgrade-cta a {
      color: var(--tn-primary-light);
      font-weight: 600;
      text-decoration: none;
    }

    .upgrade-cta a:hover {
      text-decoration: underline;
    }

    /* ── Done card ── */
    .done-section {
      text-align: center;
    }

    .done-icon-wrap {
      width: 72px;
      height: 72px;
      margin: 0 auto var(--tn-space-5);
      background: linear-gradient(135deg, var(--tn-success), var(--tn-accent));
      border-radius: 50%;
      display: grid;
      place-items: center;
      font-size: 32px;
      box-shadow: 0 8px 32px rgba(46, 232, 154, 0.35);
      animation: popIn 0.5s var(--tn-ease-out);
    }

    @keyframes popIn {
      from { transform: scale(0.6); opacity: 0; }
      to { transform: scale(1); opacity: 1; }
    }

    .done-title {
      font-family: var(--tn-font-heading);
      font-size: var(--tn-text-xl);
      font-weight: 700;
      color: var(--tn-text-on-dark);
      margin-bottom: var(--tn-space-2);
    }

    .done-desc {
      font-size: var(--tn-text-sm);
      color: var(--tn-text-sub);
      margin-bottom: var(--tn-space-6);
    }

    .url-block {
      background: rgba(15, 22, 40, 0.5);
      border: 1px solid var(--tn-border-subtle);
      border-radius: var(--tn-radius-md);
      padding: var(--tn-space-4);
      margin-bottom: var(--tn-space-3);
      text-align: left;
    }

    .url-block-label {
      font-size: var(--tn-text-xs);
      color: var(--tn-text-muted);
      font-family: var(--tn-font-heading);
      font-weight: 700;
      letter-spacing: 0.08em;
      text-transform: uppercase;
      margin-bottom: var(--tn-space-1);
    }

    .url-block a {
      color: var(--tn-primary-light);
      font-weight: 600;
      font-size: var(--tn-text-sm);
      word-break: break-all;
    }

    .url-block a:hover {
      color: var(--tn-accent);
    }

    /* ── Confetti (CSS only) ── */
    .confetti-wrap {
      position: fixed;
      inset: 0;
      pointer-events: none;
      z-index: 999;
      overflow: hidden;
    }

    .confetti-wrap.active .confetti-piece {
      animation-play-state: running;
    }

    .confetti-piece {
      position: absolute;
      top: -20px;
      width: 10px;
      height: 10px;
      border-radius: 2px;
      animation: confettiFall 3s ease-in forwards;
      animation-play-state: paused;
    }

    @keyframes confettiFall {
      0% { transform: translateY(0) rotate(0deg); opacity: 1; }
      80% { opacity: 1; }
      100% { transform: translateY(110vh) rotate(720deg); opacity: 0; }
    }

    @media (prefers-reduced-motion: reduce) {
      .confetti-piece { animation: none; }
    }

    /* ── Responsive ── */
    @media (max-width: 600px) {
      .reg-card {
        padding: var(--tn-space-8) var(--tn-space-5);
        border-radius: var(--tn-radius-lg);
      }

      .slug-prefix {
        display: none;
      }

      .slug-row .field-input {
        border-radius: var(--tn-radius-md);
      }
    }

/* ── Next-steps guide on registration completion (UX improvement) ── */
.next-steps-guide {
  margin: 24px 0;
  padding: 20px 24px;
  background: linear-gradient(135deg, rgba(45,191,129,0.08), rgba(79,107,255,0.08));
  border: 1px solid rgba(45,191,129,0.25);
  border-radius: 14px;
  text-align: left;
}

.next-steps-title {
  margin: 0 0 12px;
  font-weight: 700;
  color: var(--tn-text, #e7ecff);
  font-size: 0.98rem;
}

.next-steps-list {
  margin: 0;
  padding-left: 22px;
  color: var(--tn-text-mute, #b3bdda);
  line-height: 1.9;
  font-size: 0.92rem;
}

.next-steps-list li strong {
  color: var(--tn-text, #e7ecff);
}

/* ── Slug check spinner (UX improvement) ── */
.slug-status-checking::before {
  content: '';
  display: inline-block;
  width: 12px;
  height: 12px;
  border: 2px solid currentColor;
  border-top-color: transparent;
  border-radius: 50%;
  margin-right: 6px;
  vertical-align: -2px;
  animation: tn-spin 0.9s linear infinite;
}

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