:root{
    --bg: #F5F9FD;
    --bg-alt: #EAF2FB;
    --panel: #FFFFFF;
    --ink: #0B2A4A;
    --ink-soft: #4A6483;
    --ink-faint: #7C93AC;
    --blue: #2C6FD9;
    --blue-deep: #1B4E9E;
    --blue-soft: #7FB0E8;
    --sky: #D3E6F8;
    --line: #DCE9F7;
    --radius: 14px;
    --maxw: 1160px;
  }

  *{ box-sizing: border-box; }
  html{ scroll-behavior: smooth; }
  body{
    margin:0;
    background: var(--bg);
    color: var(--ink);
    font-family: 'Sarabun', sans-serif;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
  }
  h1,h2,h3, .display{
    font-family: 'Prompt', sans-serif;
    color: var(--ink);
    margin: 0;
    line-height: 1.25;
  }
  .mono{
    font-family: 'JetBrains Mono', monospace;
    letter-spacing: 0.02em;
  }
  a{ color: inherit; }
  .wrap{
    max-width: var(--maxw);
    margin: 0 auto;
    padding: 0 28px;
  }
  img,svg{ display:block; max-width:100%; }

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

  /* ---------- NAV ---------- */
  header{
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(245,249,253,0.86);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--line);
  }
  nav.wrap{
    display:flex;
    align-items:center;
    justify-content: space-between;
    height: 72px;
  }
  .logo{
    display:flex;
    align-items:center;
    gap: 10px;
    font-family: 'Prompt', sans-serif;
    font-weight: 700;
    font-size: 1.15rem;
    color: var(--ink);
    text-decoration:none;
  }
  .logo-mark{
    width: 32px; height: 32px;
    border-radius: 9px;
    background: linear-gradient(145deg, var(--blue), var(--blue-deep));
    display:flex; align-items:center; justify-content:center;
    box-shadow: 0 4px 12px rgba(44,111,217,0.35);
  }
  .logo-mark svg{ width:16px; height:16px; }
  .navlinks{
    display:flex;
    gap: 30px;
    list-style:none;
    margin:0; padding:0;
  }
  .navlinks a{
    text-decoration:none;
    font-size: 0.95rem;
    color: var(--ink-soft);
    font-weight: 500;
    transition: color .2s ease;
    position:relative;
  }
  .navlinks a:hover{ color: var(--blue-deep); }
  .navlinks a:focus-visible, .btn:focus-visible, .card:focus-visible{
    outline: 2px solid var(--blue);
    outline-offset: 3px;
  }
  .nav-cta{
    display:inline-flex;
    align-items:center;
    gap:8px;
    background: var(--ink);
    color:#fff;
    padding: 10px 18px;
    border-radius: 999px;
    font-size: 0.9rem;
    font-weight:600;
    text-decoration:none;
    transition: transform .2s ease, background .2s ease;
  }
  .nav-cta:hover{ background: var(--blue-deep); transform: translateY(-1px); }
  .navtoggle{ display:none; }

  @media (max-width: 860px){
    .navlinks{ display:none; }
    .nav-cta{ display:none; }
  }

  /* ---------- HERO ---------- */
  .hero{
    padding: 96px 0 60px;
    position: relative;
  }
  .hero-grid{
    display:grid;
    grid-template-columns: 1.05fr 0.95fr;
    gap: 56px;
    align-items:center;
  }
  .eyebrow{
    display:inline-flex;
    align-items:center;
    gap: 8px;
    font-family:'JetBrains Mono', monospace;
    font-size: 0.78rem;
    color: var(--blue-deep);
    background: var(--sky);
    padding: 7px 14px;
    border-radius: 999px;
    margin-bottom: 22px;
    letter-spacing: 0.03em;
  }
  .eyebrow::before{
    content:'';
    width:6px; height:6px;
    border-radius:50%;
    background: var(--blue);
    display:inline-block;
    box-shadow: 0 0 0 4px rgba(44,111,217,0.18);
  }
  .hero h1{
    font-size: clamp(2.1rem, 4.2vw, 3.2rem);
    font-weight: 700;
    letter-spacing: -0.01em;
  }
  .hero h1 .accent{ color: var(--blue); }
  .hero p.lead{
    margin-top: 22px;
    font-size: 1.08rem;
    color: var(--ink-soft);
    max-width: 46ch;
    line-height: 1.75;
  }
  .hero-actions{
    margin-top: 34px;
    display:flex;
    gap: 14px;
    flex-wrap: wrap;
  }
  .btn{
    display:inline-flex;
    align-items:center;
    gap:8px;
    padding: 14px 26px;
    border-radius: 999px;
    font-weight: 600;
    font-size: 0.98rem;
    text-decoration:none;
    cursor:pointer;
    border: none;
    transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
  }
  .btn-primary{
    background: var(--blue);
    color: #fff;
    box-shadow: 0 10px 24px rgba(44,111,217,0.28);
  }
  .btn-primary:hover{ background: var(--blue-deep); transform: translateY(-2px); }
  .btn-ghost{
    background: transparent;
    color: var(--ink);
    border: 1.5px solid var(--line);
  }
  .btn-ghost:hover{ border-color: var(--blue-soft); background: var(--bg-alt); }

  .hero-stats{
    display:flex;
    gap: 34px;
    margin-top: 44px;
    padding-top: 28px;
    border-top: 1px solid var(--line);
  }
  .stat b{
    display:block;
    font-family:'Prompt', sans-serif;
    font-size: 1.5rem;
    color: var(--ink);
  }
  .stat span{
    font-size: 0.82rem;
    color: var(--ink-faint);
  }

  /* ---------- HERO DIAGRAM (signature) ---------- */
  .diagram-box{
    position: relative;
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 22px;
    padding: 30px;
    box-shadow: 0 20px 50px -20px rgba(11,42,74,0.18);
  }
  .diagram-box .cap{
    font-family:'JetBrains Mono', monospace;
    font-size: 0.72rem;
    color: var(--ink-faint);
    display:flex;
    justify-content: space-between;
    margin-bottom: 6px;
  }
  .diagram-box .cap .dots span{
    display:inline-block; width:7px; height:7px; border-radius:50%;
    background: var(--sky); margin-left:4px;
  }

  .pulse-line{ stroke-dasharray: 5 6; animation: dash 2.6s linear infinite; }
  @keyframes dash{ to{ stroke-dashoffset: -66; } }
  .node-pulse{ animation: pulseNode 2.6s ease-in-out infinite; transform-origin: center; }
  @keyframes pulseNode{
    0%, 100%{ transform: scale(1); }
    50%{ transform: scale(1.12); }
  }
  .core-glow{ animation: glow 3s ease-in-out infinite; }
  @keyframes glow{
    0%,100%{ opacity: .55; }
    50%{ opacity: 1; }
  }

  /* ---------- SECTION SCAFFOLDING ---------- */
  section{ padding: 88px 0; }
  .section-alt{ background: var(--bg-alt); }
  .section-head{
    max-width: 640px;
    margin: 0 auto 52px;
    text-align:center;
  }
  .section-head .eyebrow{ margin-bottom: 16px; }
  .section-head h2{
    font-size: clamp(1.6rem, 3vw, 2.2rem);
    font-weight: 700;
  }
  .section-head p{
    margin-top: 14px;
    color: var(--ink-soft);
    font-size: 1.02rem;
    line-height: 1.7;
  }

  .reveal{
    opacity: 0;
    transform: translateY(22px);
    transition: opacity .7s ease, transform .7s ease;
  }
  .reveal.in{ opacity: 1; transform: translateY(0); }

  /* ---------- TECH CARDS ---------- */
  .grid-4{
    display:grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
  }
  .card{
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 28px 24px;
    transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
  }
  .card:hover{
    transform: translateY(-5px);
    box-shadow: 0 22px 40px -22px rgba(11,42,74,0.25);
    border-color: var(--blue-soft);
  }
  .card .icon{
    width: 46px; height:46px;
    border-radius: 12px;
    background: var(--sky);
    display:flex; align-items:center; justify-content:center;
    margin-bottom: 18px;
  }
  .card .icon svg{ width:24px; height:24px; }
  .card h3{
    font-size: 1.08rem;
    font-weight:600;
    margin-bottom: 6px;
  }
  .card .tag{
    font-family:'JetBrains Mono', monospace;
    font-size: 0.68rem;
    color: var(--blue-deep);
    background: var(--sky);
    display:inline-block;
    padding: 3px 9px;
    border-radius: 6px;
    margin-bottom: 12px;
  }
  .card p{
    color: var(--ink-soft);
    font-size: 0.92rem;
    line-height: 1.65;
    margin:0;
  }

  /* ---------- DATABASE ROW ---------- */
  .grid-3{
    display:grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }
  .db-card{
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 26px;
    display:flex;
    gap: 18px;
    align-items:flex-start;
    transition: transform .25s ease, box-shadow .25s ease;
  }
  .db-card:hover{ transform: translateY(-4px); box-shadow: 0 22px 40px -24px rgba(11,42,74,0.22); }
  .db-card .icon{
    flex-shrink:0;
    width: 42px; height:42px;
    border-radius: 10px;
    background: var(--ink);
    display:flex; align-items:center; justify-content:center;
  }
  .db-card .icon svg{ width:20px; height:20px; stroke: #fff; }
  .db-card h3{ font-size: 1.02rem; font-weight:600; margin-bottom:6px; }
  .db-card p{ color: var(--ink-soft); font-size: 0.9rem; line-height:1.6; margin:0; }

  /* ---------- PLATFORMS ---------- */
  .platform-row{
    display:flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 14px;
  }
  .platform-chip{
    display:flex;
    align-items:center;
    gap: 12px;
    background: var(--panel);
    border: 1px solid var(--line);
    padding: 16px 24px;
    border-radius: 999px;
    transition: border-color .25s ease, transform .25s ease;
  }
  .platform-chip:hover{ border-color: var(--blue-soft); transform: translateY(-3px); }
  .platform-chip svg{ width:22px; height:22px; }
  .platform-chip span{ font-weight:600; font-size: 0.94rem; }

  .platform-note{
    text-align:center;
    margin-top: 30px;
    color: var(--ink-faint);
    font-family:'JetBrains Mono', monospace;
    font-size: 0.82rem;
  }

  /* ---------- PROCESS ---------- */
  .process-list{
    display:grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0;
    position: relative;
  }
  .process-list::before{
    content:'';
    position:absolute;
    top: 22px;
    left: 6%;
    right: 6%;
    height: 1px;
    background: repeating-linear-gradient(90deg, var(--blue-soft) 0 8px, transparent 8px 16px);
  }
  .process-item{
    padding: 0 18px;
    position: relative;
    text-align:left;
  }
  .process-num{
    font-family:'JetBrains Mono', monospace;
    font-size: 0.85rem;
    color: #fff;
    background: var(--blue);
    width: 44px; height: 44px;
    border-radius: 50%;
    display:flex; align-items:center; justify-content:center;
    margin-bottom: 20px;
    position: relative;
    z-index: 2;
    box-shadow: 0 6px 16px rgba(44,111,217,0.3);
  }
  .process-item h3{ font-size: 1.02rem; font-weight:600; margin-bottom: 8px; }
  .process-item p{ color: var(--ink-soft); font-size: 0.88rem; line-height:1.6; margin:0; }

  @media (max-width: 860px){
    .process-list{ grid-template-columns: 1fr; gap: 30px; }
    .process-list::before{ display:none; }
  }

  /* ---------- CONTACT ---------- */
  .contact-box{
    background: linear-gradient(135deg, var(--ink) 0%, #123361 60%, var(--blue-deep) 100%);
    border-radius: 26px;
    padding: 64px 48px;
    text-align:center;
    color: #fff;
    position: relative;
    overflow:hidden;
  }
  .contact-box::after{
    content:'';
    position:absolute;
    width: 420px; height:420px;
    background: radial-gradient(circle, rgba(127,176,232,0.25), transparent 70%);
    top: -140px; right: -100px;
  }
  .contact-box h2{
    color:#fff;
    font-size: clamp(1.6rem, 3vw, 2.1rem);
    position:relative;
  }
  .contact-box p{
    color: #C9DBF2;
    max-width: 50ch;
    margin: 16px auto 32px;
    line-height: 1.7;
    position:relative;
  }
  .contact-box .btn-primary{
    background: #fff;
    color: var(--blue-deep);
    box-shadow: 0 14px 30px rgba(0,0,0,0.25);
  }
  .contact-box .btn-primary:hover{ background: var(--sky); }
  .contact-meta{
    display:flex;
    justify-content:center;
    gap: 30px;
    margin-top: 30px;
    flex-wrap: wrap;
    position:relative;
  }
  .contact-meta div{
    font-family:'JetBrains Mono', monospace;
    font-size: 0.82rem;
    color: #AFC8E8;
  }
  .contact-meta b{ color:#fff; display:block; font-family:'Sarabun',sans-serif; font-size:0.94rem; margin-bottom:2px; }

  footer{
    padding: 34px 0;
    text-align:center;
    color: var(--ink-faint);
    font-size: 0.85rem;
  }

  /* ---------- RESPONSIVE ---------- */
  @media (max-width: 980px){
    .hero-grid{ grid-template-columns: 1fr; }
    .grid-4{ grid-template-columns: repeat(2, 1fr); }
    .grid-3{ grid-template-columns: 1fr; }
    .hero-stats{ flex-wrap:wrap; row-gap: 20px; }
  }
  @media (max-width: 560px){
    .grid-4{ grid-template-columns: 1fr; }
    .contact-box{ padding: 44px 22px; }
    .hero{ padding-top: 76px; }
  }