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

  :root {
    --navy: #0d1b2a;
    --navy-mid: #1a2e45;
    --navy-light: #253d57;
    --teal: #00b4a0;
    --teal-light: #00d4bc;
    --teal-pale: #e6faf8;
    --amber: #f59e0b;
    --text: #1a1a2e;
    --text-muted: #4a5568;
    --text-light: #718096;
    --border: #e2e8f0;
    --white: #ffffff;
    --off-white: #f8fafc;
    --serif: 'DM Serif Display', Georgia, serif;
    --sans: 'DM Sans', system-ui, sans-serif;
  }

  html { scroll-behavior: smooth; }
  body { font-family: var(--sans); color: var(--text); background: var(--white); line-height: 1.6; }
  img { max-width: 100%; }
  a { color: inherit; text-decoration: none; }

  /* ── TOPBAR ── */
  .topbar {
    background: var(--navy);
    color: rgba(255,255,255,0.75);
    font-size: 13px;
    padding: 8px 0;
    text-align: center;
    letter-spacing: 0.01em;
  }
  .topbar a { color: var(--teal-light); font-weight: 500; }
  .topbar span { margin: 0 16px; }

  /* ── NAV ── */
  nav {
    position: sticky; top: 0; z-index: 100;
    background: var(--white);
    border-bottom: 1px solid var(--border);
    padding: 0 5%;
    display: flex; align-items: center; justify-content: space-between;
    height: 64px;
  }
  .nav-logo {
    font-family: var(--serif);
    font-size: 20px;
    color: var(--navy);
    display: flex; align-items: center; gap: 10px;
  }
  .nav-logo-icon {
    width: 34px; height: 34px;
    background: var(--teal);
    border-radius: 8px;
    display: flex; align-items: center; justify-content: center;
    color: white; font-size: 16px; font-weight: 700; font-family: var(--sans);
  }
  .nav-links { display: flex; gap: 32px; align-items: center; }
  .nav-links a { font-size: 14px; font-weight: 500; color: var(--text-muted); transition: color .2s; }
  .nav-links a:hover { color: var(--teal); }
  .nav-cta {
    background: var(--teal); color: white;
    padding: 9px 20px; border-radius: 8px;
    font-size: 14px; font-weight: 600;
    transition: background .2s, transform .1s;
  }
  .nav-cta:hover { background: var(--teal-light); transform: translateY(-1px); }

  /* ── HERO ── */
  .hero {
    background: var(--navy);
    padding: 90px 5% 80px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    overflow: hidden;
  }
  .hero::before {
    content: '';
    position: absolute; top: -80px; right: -80px;
    width: 500px; height: 500px;
    background: radial-gradient(circle, rgba(0,180,160,0.12) 0%, transparent 70%);
    pointer-events: none;
  }
  .hero-badge {
    display: inline-flex; align-items: center; gap: 6px;
    background: rgba(0,180,160,0.15);
    border: 1px solid rgba(0,180,160,0.3);
    color: var(--teal-light);
    font-size: 12px; font-weight: 600; letter-spacing: 0.06em;
    padding: 5px 12px; border-radius: 999px;
    margin-bottom: 22px; text-transform: uppercase;
  }
  .hero-badge::before { content: '●'; font-size: 8px; }
  .hero h1 {
    font-family: var(--serif);
    font-size: clamp(36px, 4vw, 52px);
    color: var(--white);
    line-height: 1.15;
    margin-bottom: 20px;
  }
  .hero h1 em { font-style: italic; color: var(--teal-light); }
  .hero-sub {
    color: rgba(255,255,255,0.65);
    font-size: 17px;
    line-height: 1.7;
    margin-bottom: 36px;
    max-width: 480px;
  }
  .hero-actions { display: flex; gap: 14px; flex-wrap: wrap; align-items: center; }
  .btn-primary {
    background: var(--teal); color: white;
    padding: 14px 28px; border-radius: 10px;
    font-size: 15px; font-weight: 600;
    transition: background .2s, transform .1s;
    display: inline-block;
  }
  .btn-primary:hover { background: var(--teal-light); transform: translateY(-2px); }
  .btn-ghost {
    color: rgba(255,255,255,0.75);
    border: 1px solid rgba(255,255,255,0.2);
    padding: 14px 24px; border-radius: 10px;
    font-size: 15px; font-weight: 500;
    transition: all .2s;
    display: inline-block;
  }
  .btn-ghost:hover { border-color: var(--teal); color: var(--teal-light); }
  .hero-stats {
    display: flex; gap: 32px; margin-top: 44px;
    padding-top: 32px;
    border-top: 1px solid rgba(255,255,255,0.1);
  }
  .stat-num {
    font-family: var(--serif);
    font-size: 32px; color: var(--white);
  }
  .stat-label { font-size: 13px; color: rgba(255,255,255,0.5); margin-top: 2px; }

  /* hero right panel */
  .hero-card {
    background: var(--navy-mid);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 16px;
    padding: 28px;
    position: relative;
  }
  .hero-card-title {
    font-size: 13px; font-weight: 600; letter-spacing: 0.05em;
    color: var(--teal-light); text-transform: uppercase;
    margin-bottom: 20px;
  }
  .upgrade-row {
    display: flex; align-items: center; gap: 12px;
    padding: 14px 0;
    border-bottom: 1px solid rgba(255,255,255,0.07);
  }
  .upgrade-row:last-of-type { border-bottom: none; }
  .version-from {
    background: rgba(255,255,255,0.06);
    color: rgba(255,255,255,0.5);
    font-size: 13px; font-family: monospace;
    padding: 5px 10px; border-radius: 6px; min-width: 80px; text-align: center;
  }
  .arrow-icon { color: var(--teal); font-size: 18px; }
  .version-to {
    background: rgba(0,180,160,0.15);
    color: var(--teal-light);
    font-size: 13px; font-family: monospace;
    padding: 5px 10px; border-radius: 6px; min-width: 80px; text-align: center;
    font-weight: 600;
  }
  .upgrade-meta { margin-left: auto; font-size: 12px; color: rgba(255,255,255,0.35); }
  .hero-card-footer {
    margin-top: 20px;
    background: rgba(0,180,160,0.1);
    border-radius: 10px;
    padding: 14px 16px;
    display: flex; align-items: center; gap: 10px;
  }
  .check-icon { color: var(--teal); font-size: 18px; }
  .footer-text { font-size: 13px; color: rgba(255,255,255,0.7); }
  .footer-text strong { color: white; font-weight: 600; }

  /* ── LOGOS / SOCIAL PROOF BAR ── */
  .proof-bar {
    background: var(--off-white);
    border-bottom: 1px solid var(--border);
    padding: 18px 5%;
    display: flex; align-items: center; gap: 0;
    overflow: hidden;
  }
  .proof-label {
    font-size: 12px; font-weight: 600; letter-spacing: 0.06em;
    color: var(--text-light); text-transform: uppercase;
    white-space: nowrap; margin-right: 32px;
    flex-shrink: 0;
  }
  .proof-items {
    display: flex; gap: 40px; align-items: center;
    overflow-x: auto; padding-bottom: 2px;
  }
  .proof-item {
    font-size: 14px; font-weight: 600;
    color: var(--text-light);
    white-space: nowrap; opacity: 0.6;
  }

  /* ── SECTION SHARED ── */
  section { padding: 80px 5%; }
  .section-label {
    font-size: 12px; font-weight: 700; letter-spacing: 0.1em;
    color: var(--teal); text-transform: uppercase;
    margin-bottom: 10px;
  }
  .section-title {
    font-family: var(--serif);
    font-size: clamp(28px, 3vw, 40px);
    color: var(--navy);
    line-height: 1.2;
    margin-bottom: 14px;
  }
  .section-sub {
    font-size: 17px; color: var(--text-muted);
    max-width: 560px; line-height: 1.7;
    margin-bottom: 48px;
  }

  /* ── SERVICES ── */
  .services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
  }
  .service-card {
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 28px;
    transition: border-color .2s, transform .2s, box-shadow .2s;
    background: var(--white);
    position: relative;
  }
  .service-card:hover {
    border-color: var(--teal);
    transform: translateY(-3px);
    box-shadow: 0 12px 32px rgba(0,180,160,0.08);
  }
  .service-icon {
    width: 44px; height: 44px;
    background: var(--teal-pale);
    border-radius: 10px;
    display: flex; align-items: center; justify-content: center;
    font-size: 20px; margin-bottom: 16px;
  }
  .service-card h3 { font-size: 17px; font-weight: 600; margin-bottom: 8px; color: var(--navy); }
  .service-card p { font-size: 14px; color: var(--text-muted); line-height: 1.65; margin-bottom: 16px; }
  .service-tag {
    font-size: 11px; font-weight: 600; letter-spacing: 0.04em;
    background: var(--teal-pale); color: var(--teal);
    padding: 3px 9px; border-radius: 999px;
    display: inline-block;
  }
  .service-card.featured {
    border-color: var(--teal);
    background: linear-gradient(135deg, #f0fdfb 0%, #ffffff 100%);
  }
  .featured-badge {
    position: absolute; top: -1px; right: 20px;
    background: var(--teal); color: white;
    font-size: 11px; font-weight: 700; letter-spacing: 0.04em;
    padding: 4px 12px; border-radius: 0 0 8px 8px;
    text-transform: uppercase;
  }

  /* ── UPGRADE PROCESS ── */
  .upgrade-section { background: var(--navy); }
  .upgrade-section .section-title { color: white; }
  .upgrade-section .section-sub { color: rgba(255,255,255,0.6); }
  .steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 0;
    position: relative;
    margin-top: 16px;
  }
  .step {
    padding: 28px 24px;
    border-left: 1px solid rgba(255,255,255,0.08);
    position: relative;
  }
  .step:first-child { border-left: none; }
  .step-num {
    font-family: var(--serif);
    font-size: 48px; color: rgba(0,180,160,0.25);
    line-height: 1;
    margin-bottom: 12px;
  }
  .step h4 { font-size: 16px; font-weight: 600; color: white; margin-bottom: 8px; }
  .step p { font-size: 13px; color: rgba(255,255,255,0.5); line-height: 1.6; }

  /* ── TESTIMONIALS ── */
  .testimonials-section { background: var(--off-white); }
  .testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
  }
  .testimonial-card {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 28px;
  }
  .stars { color: var(--amber); font-size: 16px; margin-bottom: 14px; letter-spacing: 2px; }
  .testimonial-text {
    font-size: 15px; line-height: 1.7;
    color: var(--text);
    margin-bottom: 20px;
    font-style: italic;
  }
  .testimonial-author { display: flex; align-items: center; gap: 12px; }
  .author-avatar {
    width: 42px; height: 42px; border-radius: 50%;
    background: var(--navy);
    display: flex; align-items: center; justify-content: center;
    font-size: 15px; font-weight: 700; color: var(--teal-light);
    flex-shrink: 0;
  }
  .author-name { font-size: 14px; font-weight: 600; color: var(--navy); }
  .author-meta { font-size: 12px; color: var(--text-light); margin-top: 2px; }
  .service-done {
    margin-top: 10px;
    font-size: 12px; font-weight: 600;
    background: var(--teal-pale); color: var(--teal);
    padding: 3px 9px; border-radius: 999px; display: inline-block;
  }

  /* ── TROUBLESHOOTING GUIDES CTA ── */
  .guides-section {
    background: var(--white);
    border-top: 1px solid var(--border);
  }
  .guides-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 16px;
    margin-top: 0;
  }
  .guide-card {
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px 22px;
    display: flex; align-items: flex-start; gap: 14px;
    transition: border-color .2s, background .2s;
    cursor: pointer;
  }
  .guide-card:hover { border-color: var(--teal); background: var(--teal-pale); }
  .guide-icon { font-size: 22px; flex-shrink: 0; margin-top: 2px; }
  .guide-title { font-size: 14px; font-weight: 600; color: var(--navy); margin-bottom: 4px; }
  .guide-desc { font-size: 13px; color: var(--text-muted); line-height: 1.5; }

  /* ── CTA BAND ── */
  .cta-band {
    background: linear-gradient(135deg, var(--navy) 0%, var(--navy-light) 100%);
    padding: 80px 5%;
    text-align: center;
  }
  .cta-band h2 {
    font-family: var(--serif);
    font-size: clamp(28px, 3vw, 42px);
    color: white; margin-bottom: 16px;
  }
  .cta-band p { font-size: 17px; color: rgba(255,255,255,0.6); margin-bottom: 36px; }
  .cta-options {
    display: flex; gap: 16px; justify-content: center; flex-wrap: wrap;
    align-items: center;
  }
  .cta-phone {
    color: var(--teal-light);
    font-size: 15px; font-weight: 600;
  }

  /* ── FOOTER ── */
  footer {
    background: var(--navy);
    color: rgba(255,255,255,0.5);
    padding: 48px 5% 32px;
  }
  .footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
  }
  .footer-brand p { font-size: 14px; line-height: 1.7; margin-top: 12px; max-width: 280px; }
  footer h4 { font-size: 13px; font-weight: 700; letter-spacing: 0.06em; color: white; text-transform: uppercase; margin-bottom: 16px; }
  footer ul { list-style: none; }
  footer li { margin-bottom: 10px; }
  footer a { font-size: 14px; color: rgba(255,255,255,0.5); transition: color .2s; }
  footer a:hover { color: var(--teal-light); }
  .footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.08);
    padding-top: 24px;
    display: flex; justify-content: space-between; align-items: center;
    font-size: 13px;
  }

  /* ── RESPONSIVE ── */
  @media (max-width: 768px) {
    .hero { grid-template-columns: 1fr; gap: 40px; padding: 60px 5%; }
    .hero-card { display: none; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .nav-links { display: none; }
    .steps { grid-template-columns: 1fr 1fr; }
    .step { border-left: none; border-top: 1px solid rgba(255,255,255,0.08); }
    .step:nth-child(-n+2) { border-top: none; }
  }
  @media (max-width: 480px) {
    .footer-grid { grid-template-columns: 1fr; }
    .steps { grid-template-columns: 1fr; }
    .step { border-top: 1px solid rgba(255,255,255,0.08); }
    .step:first-child { border-top: none; }
  }