html, body { overflow-x: hidden; max-width: 100vw; }

  :root {
    --c1: var(--color-brand-primary);
    --c2: var(--color-brand-secondary);
    --cg: var(--color-accent-gold);
    --cc: var(--color-accent-cyan);
    --bg: var(--color-neutral-950);
    --bg2: var(--color-neutral-900);
    --bg3: var(--color-neutral-800);
    --fg: var(--color-text-primary);
    --fg2: var(--color-text-secondary);
    --rad: var(--radius-lg);
    --rad2: var(--radius-xl);
    --sp1: var(--spacing-sm);
    --sp2: var(--spacing-md);
    --sp3: var(--spacing-lg);
    --sp4: var(--spacing-xl);
    --sp5: var(--spacing-2xl);
    --tr: var(--transition-smooth);
  }

  [data-section="login-hero"] {
    background: var(--gradient-hero);
    border-radius: var(--rad2);
    padding: var(--sp5) var(--sp4);
    margin-bottom: var(--sp5);
    position: relative;
    overflow: hidden;
    text-align: center;
  }

  [data-section="login-hero"]::after {
    content: '';
    position: absolute;
    top: -40%;
    right: -10%;
    width: 420px;
    height: 420px;
    background: radial-gradient(circle, rgba(var(--color-accent-gold), 0.08) 0%, transparent 70%);
    pointer-events: none;
    border-radius: 50%;
  }

  .hero-eyebrow {
    display: inline-block;
    background: var(--gradient-cta);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-family: var(--font-body);
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    margin-bottom: var(--sp2);
  }

  .hero-title {
    font-family: var(--font-heading);
    font-size: clamp(2rem, 5vw, 3.2rem);
    font-weight: 800;
    color: var(--fg);
    margin: 0 0 var(--sp2);
    line-height: 1.15;
  }

  .hero-title span {
    background: var(--gradient-cta);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
  }

  .hero-desc {
    font-family: var(--font-body);
    font-size: 1.05rem;
    color: var(--fg2);
    max-width: 580px;
    margin: 0 auto var(--sp4);
    line-height: 1.7;
  }

  .hero-cta-wrap {
    display: flex;
    gap: var(--sp2);
    justify-content: center;
    flex-wrap: wrap;
  }

  /* Steps section */
  [data-section="login-steps"] {
    margin-bottom: var(--sp5);
  }

  .section-heading {
    font-family: var(--font-heading);
    font-size: clamp(1.4rem, 3vw, 2rem);
    font-weight: 700;
    color: var(--fg);
    margin: 0 0 var(--sp3);
    text-align: center;
  }

  .section-heading span {
    background: var(--gradient-cta);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
  }

  .steps-timeline {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--sp3);
    position: relative;
  }

  .step-card {
    background: var(--gradient-card);
    border: 1px solid rgba(255,255,255,0.07);
    border-radius: var(--rad);
    padding: var(--sp3) var(--sp2);
    text-align: center;
    box-shadow: var(--shadow-card);
    transition: var(--tr);
    position: relative;
    overflow: hidden;
  }

  .step-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-card-hover);
    border-color: rgba(255,255,255,0.15);
  }

  .step-num {
    width: 52px;
    height: 52px;
    border-radius: 50%;
    background: var(--gradient-cta);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-heading);
    font-size: 1.3rem;
    font-weight: 800;
    color: #fff;
    margin: 0 auto var(--sp2);
    box-shadow: var(--shadow-glow-primary);
  }

  .step-card h3 {
    font-family: var(--font-heading);
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--fg);
    margin: 0 0 var(--sp1);
  }

  .step-card p {
    font-family: var(--font-body);
    font-size: 0.85rem;
    color: var(--fg2);
    margin: 0;
    line-height: 1.6;
  }

  /* App section */
  [data-section="app-login"] {
    background: var(--gradient-section-alt);
    border-radius: var(--rad2);
    padding: var(--sp5) var(--sp4);
    margin-bottom: var(--sp5);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--sp4);
    align-items: center;
    border: 1px solid rgba(255,255,255,0.06);
  }

  .app-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--sp1);
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius-full);
    padding: 6px 16px;
    font-family: var(--font-body);
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--fg2);
    letter-spacing: 0.12em;
    text-transform: uppercase;
    margin-bottom: var(--sp2);
  }

  .app-badge::before {
    content: '●';
    color: var(--color-success);
    font-size: 0.6rem;
  }

  .app-heading {
    font-family: var(--font-heading);
    font-size: clamp(1.3rem, 2.5vw, 1.9rem);
    font-weight: 800;
    color: var(--fg);
    margin: 0 0 var(--sp2);
    line-height: 1.2;
  }

  .app-text {
    font-family: var(--font-body);
    font-size: 0.95rem;
    color: var(--fg2);
    line-height: 1.7;
    margin: 0 0 var(--sp3);
  }

  .app-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--sp2);
  }

  .app-feat {
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: var(--radius-md);
    padding: var(--sp2);
    text-align: center;
  }

  .app-feat-icon {
    font-size: 1.6rem;
    display: block;
    margin-bottom: 6px;
  }

  .app-feat-label {
    font-family: var(--font-body);
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--fg2);
  }

  /* Register section */
  [data-section="register"] {
    margin-bottom: var(--sp5);
  }

  .register-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--sp4);
    align-items: start;
  }

  .register-intro h2 { text-align: left; margin-bottom: var(--sp2); }

  .register-intro p {
    font-family: var(--font-body);
    font-size: 0.95rem;
    color: var(--fg2);
    line-height: 1.7;
    margin: 0 0 var(--sp3);
  }

  .reg-fields {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--sp2);
  }

  .reg-field {
    background: var(--gradient-card);
    border: 1px solid rgba(255,255,255,0.07);
    border-radius: var(--radius-md);
    padding: var(--sp2);
    display: flex;
    align-items: center;
    gap: var(--sp1);
    transition: var(--tr);
  }

  .reg-field:hover {
    border-color: rgba(255,255,255,0.16);
    box-shadow: var(--shadow-card);
  }

  .reg-field-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--gradient-cta);
    flex-shrink: 0;
  }

  .reg-field span {
    font-family: var(--font-body);
    font-size: 0.82rem;
    color: var(--fg2);
    font-weight: 500;
  }

  .verify-note {
    margin-top: var(--sp3);
    background: rgba(255,255,255,0.03);
    border-left: 3px solid var(--color-accent-gold);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    padding: var(--sp2) var(--sp3);
    font-family: var(--font-body);
    font-size: 0.88rem;
    color: var(--fg2);
    line-height: 1.6;
  }

  /* Troubleshoot */
  [data-section="troubleshoot"] {
    margin-bottom: var(--sp5);
  }

  .trouble-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--sp3);
  }

  .trouble-card {
    background: var(--gradient-card);
    border: 1px solid rgba(255,255,255,0.07);
    border-radius: var(--rad);
    padding: var(--sp3);
    box-shadow: var(--shadow-card);
    transition: var(--tr);
    border-top: 3px solid transparent;
  }

  .trouble-card:nth-child(1) { border-top-color: var(--color-brand-primary); }
  .trouble-card:nth-child(2) { border-top-color: var(--color-accent-gold); }
  .trouble-card:nth-child(3) { border-top-color: var(--color-accent-cyan); }
  .trouble-card:nth-child(4) { border-top-color: var(--color-brand-secondary); }

  .trouble-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-card-hover);
    border-color: rgba(255,255,255,0.14);
  }

  .trouble-card h3 {
    font-family: var(--font-heading);
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--fg);
    margin: 0 0 var(--sp1);
  }

  .trouble-card p {
    font-family: var(--font-body);
    font-size: 0.85rem;
    color: var(--fg2);
    margin: 0;
    line-height: 1.6;
  }

  /* FAQ */
  [data-section="faq"] {
    margin-bottom: var(--sp5);
  }

  .faq-list {
    display: flex;
    flex-direction: column;
    gap: var(--sp2);
  }

  .faq-item {
    background: var(--gradient-card);
    border: 1px solid rgba(255,255,255,0.07);
    border-radius: var(--rad);
    overflow: hidden;
    transition: var(--tr);
  }

  .faq-item:hover { border-color: rgba(255,255,255,0.14); }

  .faq-q {
    width: 100%;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: var(--sp3);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--sp2);
    text-align: left;
  }

  .faq-q-text {
    font-family: var(--font-heading);
    font-size: 0.97rem;
    font-weight: 700;
    color: var(--fg);
  }

  .faq-icon {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: rgba(255,255,255,0.06);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: var(--tr);
    font-size: 1rem;
    color: var(--fg2);
    font-weight: 300;
  }

  .faq-item.active .faq-icon {
    background: var(--gradient-cta);
    color: #fff;
    transform: rotate(45deg);
  }

  .faq-a {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.3s ease;
    padding: 0 var(--sp3);
  }

  .faq-item.active .faq-a {
    max-height: 200px;
    padding: 0 var(--sp3) var(--sp3);
  }

  .faq-a p {
    font-family: var(--font-body);
    font-size: 0.9rem;
    color: var(--fg2);
    line-height: 1.7;
    margin: 0;
  }

  .faq-trust {
    display: flex;
    align-items: center;
    gap: var(--sp2);
    margin-top: var(--sp3);
    padding: var(--sp2) var(--sp3);
    background: rgba(255,255,255,0.03);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255,255,255,0.06);
  }

  .faq-trust-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--color-success);
    flex-shrink: 0;
    box-shadow: 0 0 8px var(--color-success);
  }

  .faq-trust span {
    font-family: var(--font-body);
    font-size: 0.82rem;
    color: var(--fg2);
  }

  /* Mobile */
  @media (max-width: 768px) {
    [data-section="app-login"] {
      grid-template-columns: 1fr;
    }
    .register-grid {
      grid-template-columns: 1fr;
    }
    .register-intro h2 { text-align: center; }
    .reg-fields {
      grid-template-columns: 1fr 1fr;
    }
    [data-section="login-hero"] {
      padding: var(--sp4) var(--sp2);
    }
    .app-features {
      grid-template-columns: 1fr 1fr;
    }
  }

  @media (max-width: 480px) {
    .reg-fields { grid-template-columns: 1fr; }
    .steps-timeline { grid-template-columns: 1fr 1fr; }
    .app-features { grid-template-columns: 1fr 1fr; }
    .hero-cta-wrap { flex-direction: column; align-items: center; }
  }

  @media (max-width: 320px) {
    .steps-timeline { grid-template-columns: 1fr; }
  }