:root{
    --bg: #F6FBFD;
    --bg-deep: #082C4A;
    --primary: #2E86C1;
    --primary-dark: #1B5E86;
    --teal: #17A398;
    --ink: #12222D;
    --ink-soft: #4E6472;
    --line: #D7E8EF;
    --white: #FFFFFF;
    --murky: #B08D5E;
    --radius: 14px;
  }
  *{box-sizing:border-box;}
  html{scroll-behavior:smooth;}
  body{
    margin:0;
    background:var(--bg);
    color:var(--ink);
    font-family:'Inter',sans-serif;
    line-height:1.55;
  }
  h1,h2,h3,.display{
    font-family:'Space Grotesk',sans-serif;
    letter-spacing:-0.01em;
    margin:0;
  }
  .mono{ font-family:'IBM Plex Mono',monospace; letter-spacing:0.02em; }
  a{ color:inherit; text-decoration:none; }
  img,svg{ display:block; max-width:100%; }
  button{ font-family:inherit; cursor:pointer; border:none; }
  .wrap{ max-width:1180px; margin:0 auto; padding:0 24px; }

  /* focus visibility */
  a:focus-visible, button:focus-visible, input:focus-visible{
    outline:2px solid var(--teal);
    outline-offset:2px;
  }

  @media (prefers-reduced-motion: reduce){
    *{ animation-duration:0.001ms !important; animation-iteration-count:1 !important; transition-duration:0.001ms !important; }
  }

  /* ---------- Header ---------- */
  header{
    position:sticky; top:0; z-index:50;
    background:rgba(246,251,253,0.9);
    backdrop-filter:blur(8px);
    border-bottom:1px solid var(--line);
  }
  .nav{
    display:flex; align-items:center; justify-content:space-between;
    padding:16px 24px;
  }
  .logo{ display:flex; align-items:center; gap:10px; font-weight:700; font-size:20px; }
  .logo-img{ width:38px; height:38px; border-radius:50%; object-fit:cover; display:block; }
  .logo .dot{ width:10px; height:10px; border-radius:50%; background:var(--teal); }
  .nav-links{ display:flex; gap:32px; font-size:15px; font-weight:500; color:var(--ink-soft); }
  .nav-links a:hover{ color:var(--primary); }
  .nav-actions{ display:flex; align-items:center; gap:14px; }
  .social-icon{
    display:flex; align-items:center; justify-content:center;
    width:36px; height:36px; border-radius:50%; background:var(--white);
    border:1px solid var(--line); transition:border-color .15s, transform .15s;
  }
  .social-icon:hover{ border-color:var(--primary); transform:translateY(-1px); }
  @media (max-width:820px){ .nav-links{ display:none; } }

  /* ---------- Hero ---------- */
  .hero{
    padding:64px 0 40px;
    display:grid; grid-template-columns:1.1fr 0.9fr; gap:48px; align-items:center;
  }
  .eyebrow{
    display:inline-flex; align-items:center; gap:8px;
    font-family:'IBM Plex Mono',monospace; font-size:12px; color:var(--primary-dark);
    background:#E7F3FA; border:1px solid var(--line); padding:6px 12px; border-radius:999px;
    margin-bottom:18px;
  }
  .hero h1{ font-size:clamp(32px,4.6vw,54px); font-weight:700; line-height:1.08; color:var(--bg-deep); }
  .hero h1 span{ color:var(--primary); }
  .hero p.lead{ margin-top:20px; font-size:17px; color:var(--ink-soft); max-width:480px; }
  .hero-cta{ display:flex; gap:14px; margin-top:32px; flex-wrap:wrap; }
  .btn-primary{
    background:var(--primary); color:#fff; padding:14px 26px; border-radius:10px;
    font-weight:600; font-size:15px; transition:background .15s;
  }
  .btn-primary:hover{ background:var(--primary-dark); }
  .btn-ghost{
    background:transparent; color:var(--bg-deep); padding:14px 26px; border-radius:10px;
    font-weight:600; font-size:15px; border:1.5px solid var(--line);
  }
  .btn-ghost:hover{ border-color:var(--primary); color:var(--primary); }

  .hero-stats{ display:flex; gap:28px; margin-top:36px; }
  .hero-stats div{ font-family:'Space Grotesk'; }
  .hero-stats strong{ font-size:24px; display:block; color:var(--bg-deep); }
  .hero-stats span{ font-size:12.5px; color:var(--ink-soft); font-family:'Inter'; }

  /* Signature: filtration cross-section */
  .filter-rig{
    background:var(--white); border:1px solid var(--line); border-radius:20px;
    padding:24px; position:relative; overflow:hidden;
    box-shadow:0 20px 50px -30px rgba(8,44,74,0.35);
  }
  .filter-rig .cap{ font-family:'IBM Plex Mono'; font-size:11px; color:var(--ink-soft); display:flex; justify-content:space-between; margin-bottom:10px; }

  /* ---------- Trust bar ---------- */
  .trust{
    border-top:1px solid var(--line); border-bottom:1px solid var(--line);
    padding:22px 0; background:var(--white);
  }
  .trust .wrap{
    display:flex; gap:40px; align-items:center; justify-content:space-between; flex-wrap:wrap;
  }
  .trust-item{ display:flex; align-items:center; gap:10px; font-size:13.5px; color:var(--ink-soft); font-weight:600; }
  .trust-item .mono{ color:var(--teal); font-size:12px; }

  /* ---------- Segment tabs ---------- */
  .segment-section{ padding:80px 0 20px; }
  .section-head{ max-width:640px; margin-bottom:36px; }
  .section-eyebrow{ font-family:'IBM Plex Mono'; font-size:12px; color:var(--teal); font-weight:600; margin-bottom:10px; display:block; }
  .section-head h2{ font-size:clamp(26px,3vw,36px); color:var(--bg-deep); font-weight:700; }
  .section-head p{ color:var(--ink-soft); margin-top:10px; font-size:15.5px; }

  .tabs{ display:inline-flex; background:var(--white); border:1px solid var(--line); border-radius:999px; padding:5px; margin-bottom:36px; }
  .tab{
    padding:10px 22px; border-radius:999px; font-weight:600; font-size:14px; color:var(--ink-soft);
    background:transparent; transition:all .15s;
  }
  .tab.active{ background:var(--bg-deep); color:#fff; }

  .grid{ display:grid; grid-template-columns:repeat(4,1fr); gap:22px; align-items:stretch; }
  @media (max-width:980px){ .grid{ grid-template-columns:repeat(2,1fr); } }
  @media (max-width:560px){ .grid{ grid-template-columns:1fr; } }

  .card{
    background:var(--white); border:1px solid var(--line); border-left:3px solid var(--primary);
    border-radius:var(--radius); padding:26px 24px 22px;
    display:flex; flex-direction:column; gap:18px;
    transition:box-shadow .2s, transform .2s, border-left-color .2s;
  }
  .card:hover{ box-shadow:0 20px 40px -26px rgba(8,44,74,0.32); transform:translateY(-3px); border-left-color:var(--teal); }
  .card h3{ font-size:17.5px; font-weight:700; line-height:1.35; color:var(--bg-deep); }
  .card .detail{ display:flex; flex-direction:column; gap:6px; }
  .card .detail + .detail{ padding-top:16px; border-top:1px dashed var(--line); }
  .card .detail-label{
    font-family:'IBM Plex Mono',monospace; font-size:11px; font-weight:600; letter-spacing:0.03em;
    color:var(--primary-dark);
  }
  .card .detail.solution .detail-label{ color:var(--teal); }
  .card .detail p{ margin:0; font-size:13.5px; line-height:1.55; color:var(--ink-soft); }
  .add-btn{
    background:var(--bg-deep); color:#fff; padding:12px; border-radius:8px; font-size:13.5px; font-weight:600;
    text-align:center; transition:background .15s; margin-top:auto;
    display:flex; align-items:center; justify-content:center; gap:6px;
  }
  .add-btn:hover{ background:var(--primary); }
  .add-btn .arrow{ transition:transform .15s; }
  .add-btn:hover .arrow{ transform:translateX(3px); }

  /* ---------- How it works ---------- */
  .process{ padding:90px 0; background:var(--bg-deep); color:#fff; margin-top:80px; }
  .process .section-head h2{ color:#fff; }
  .process .section-head p{ color:#AFC8D8; }
  .process .section-eyebrow{ color:#6FD7C9; }
  .process-grid{ display:grid; grid-template-columns:repeat(4,1fr); gap:0; margin-top:20px; border-top:1px solid rgba(255,255,255,0.15); }
  @media (max-width:900px){ .process-grid{ grid-template-columns:1fr; } }
  .stage{
    padding:28px 22px; border-right:1px solid rgba(255,255,255,0.15); border-bottom:1px solid rgba(255,255,255,0.15);
  }
  .process-grid .stage:last-child{ border-right:none; }
  @media (max-width:900px){ .stage{ border-right:none; } }
  .stage .num{ font-family:'IBM Plex Mono'; font-size:13px; color:#6FD7C9; }
  .stage h3{ font-size:17px; margin-top:14px; font-weight:600; }
  .stage p{ font-size:13.5px; color:#AFC8D8; margin-top:8px; }

  /* ---------- Testimonial / stats strip ---------- */
  .stats-strip{ padding:70px 0; }
  .stats-grid{ display:grid; grid-template-columns:repeat(3,1fr); gap:24px; }
  @media (max-width:760px){ .stats-grid{ grid-template-columns:1fr; } }
  .stat-card{ background:var(--white); border:1px solid var(--line); border-radius:var(--radius); padding:28px; }
  .stat-card strong{ font-family:'Space Grotesk'; font-size:34px; color:var(--primary); display:block; }
  .stat-card span{ font-size:13.5px; color:var(--ink-soft); }

  /* ---------- Portfolio (placeholder) ---------- */
  .portfolio-grid{ display:grid; grid-template-columns:repeat(4,1fr); gap:20px; }
  @media (max-width:980px){ .portfolio-grid{ grid-template-columns:repeat(2,1fr); } }
  @media (max-width:560px){ .portfolio-grid{ grid-template-columns:1fr; } }
  .portfolio-card{
    background:var(--white); border:1px solid var(--line); border-radius:var(--radius);
    overflow:hidden; transition:box-shadow .2s, transform .2s;
  }
  .portfolio-card:hover{ box-shadow:0 16px 34px -22px rgba(8,44,74,0.35); transform:translateY(-2px); }
  .portfolio-thumb{
    width:100%; aspect-ratio:4/3; display:flex; align-items:center; justify-content:center;
  }
  .portfolio-thumb.placeholder{
    background:repeating-linear-gradient(135deg,#F0F5F8,#F0F5F8 10px,#E7EEF2 10px,#E7EEF2 20px);
  }
  .portfolio-info{ padding:14px 16px 18px; }
  .portfolio-info h4{ font-size:14.5px; font-weight:600; color:var(--ink); margin-bottom:4px; }
  .portfolio-info span{ font-size:12.5px; color:var(--ink-soft); }

  /* ---------- Contact / footer CTA ---------- */
  .contact-grid{
    display:grid; grid-template-columns:repeat(3,1fr); gap:16px; margin-bottom:32px;
  }
  @media (max-width:900px){ .contact-grid{ grid-template-columns:repeat(2,1fr); } }
  @media (max-width:560px){ .contact-grid{ grid-template-columns:1fr; } }
  .contact-card{
    display:flex; align-items:center; gap:14px; background:var(--white); border:1px solid var(--line);
    border-radius:var(--radius); padding:18px; transition:border-color .15s, transform .15s;
  }
  a.contact-card:hover{ border-color:var(--primary); transform:translateY(-2px); }
  .contact-card.static{ cursor:default; }
  .contact-icon{
    width:44px; height:44px; border-radius:10px; flex-shrink:0; display:flex; align-items:center; justify-content:center;
    background:#EAF6FB;
  }
  .contact-info h4{ font-size:13.5px; font-weight:700; color:var(--bg-deep); margin-bottom:3px; }
  .contact-info span{ font-size:13px; color:var(--ink-soft); line-height:1.4; }

  .cta-band{
    margin:80px 0 0; background:linear-gradient(135deg,#EAF6FB,#F6FBFD);
    border:1px solid var(--line); border-radius:24px; padding:56px; display:flex;
    align-items:center; justify-content:space-between; gap:24px; flex-wrap:wrap;
  }
  .cta-band h2{ font-size:clamp(22px,2.6vw,30px); color:var(--bg-deep); max-width:460px; }
  #contact{ scroll-margin-top:90px; }

  footer{ padding:50px 0 40px; margin-top:60px; border-top:1px solid var(--line); }
  .footer-grid{ display:flex; justify-content:space-between; flex-wrap:wrap; gap:32px; }
  .footer-col h4{ font-size:13px; margin-bottom:14px; color:var(--ink-soft); font-weight:600; }
  .footer-col a{ display:block; font-size:14px; color:var(--ink); margin-bottom:8px; }
  .footer-col a:hover{ color:var(--primary); }
  .footer-bottom{ margin-top:40px; font-size:12.5px; color:var(--ink-soft); }

  /* ---------- Floating LINE/Facebook contact ---------- */
  .floating-contact{
    position:fixed; right:22px; bottom:22px; z-index:110;
    display:flex; flex-direction:column; gap:12px;
  }
  .float-btn{
    width:52px; height:52px; border-radius:50%; display:flex; align-items:center; justify-content:center;
    box-shadow:0 10px 24px -8px rgba(8,44,74,0.45); transition:transform .15s;
  }
  .float-btn:hover{ transform:scale(1.08); }
  .float-btn.line{ background:#06C755; }
  .float-btn.fb{ background:#1877F2; }
  @media (max-width:600px){
    .floating-contact{ right:16px; bottom:16px; gap:10px; }
    .float-btn{ width:46px; height:46px; }
  }

  @media (max-width:900px){
    .hero{ grid-template-columns:1fr; }
    .cta-band{ padding:36px; }
  }