:root{
  --ink:#0B0F0D;       /* near-black */
  --bg:#FFFFFF;
  --surface:#F2F5F3;
  --green:#00C26E;     /* app green */
  --green-d:#009957;
  --sun:#FFD23F;       /* sunflower */
  --coral:#FF6B5A;
  --muted:#4E5A54;
  --line:#DDE5E0;
  --head:"Chakra Petch",Tahoma,"Leelawadee UI",sans-serif;
  --body:"Noto Sans Thai",Tahoma,"Leelawadee UI",sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{animation:none!important;transition:none!important}}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--body);font-size:1.08rem;line-height:1.85}
img{max-width:100%;height:auto;display:block}
a{color:var(--green-d)}
a:focus-visible,summary:focus-visible{outline:3px solid var(--sun);outline-offset:3px;border-radius:4px}
.wrap{width:min(1140px,100% - 2.5rem);margin-inline:auto}
.skip{position:absolute;left:-999px;top:0;background:var(--green);color:var(--ink);padding:.5rem 1rem;z-index:10}
.skip:focus{left:1rem}

.hd{position:sticky;top:0;z-index:5;background:rgba(11,15,13,.95);backdrop-filter:blur(8px)}
.hd-in{display:flex;align-items:center;gap:1.5rem;min-height:60px}
.lg{font-family:var(--head);font-weight:700;font-size:1.3rem;color:#fff;text-decoration:none;display:flex;align-items:center;gap:.55rem}
.lg-ic{width:20px;height:32px;border-radius:5px;border:2px solid var(--green);position:relative}
.lg-ic::after{content:"";position:absolute;left:50%;bottom:3px;width:5px;height:5px;margin-left:-2.5px;border-radius:50%;background:var(--green)}
.hd nav{display:flex;gap:1.3rem;margin-left:auto}
.hd nav a{color:#B9C6BF;text-decoration:none;font-size:.97rem}
.hd nav a:hover{color:var(--green)}

.btn{display:inline-block;font-family:var(--head);font-weight:600;background:var(--green);color:var(--ink);text-decoration:none;padding:.8rem 1.6rem;border-radius:14px;line-height:1.3;transition:background .15s,transform .15s}
.btn:hover{background:#19D981;transform:translateY(-1px)}
.btn:active{transform:translateY(1px)}
.btn-line{background:transparent;color:#fff;box-shadow:inset 0 0 0 2px rgba(255,255,255,.4)}
.btn-line:hover{background:rgba(255,255,255,.08)}
.btn-mini{padding:.4rem 1rem;font-size:.95rem;border-radius:10px}
.btn-full{display:block;text-align:center}
.ctr{text-align:center;margin:1.75rem 0}

.hero{background:var(--ink);color:#fff;padding:3.25rem 0 4.5rem;position:relative;overflow:hidden}
.hero::before{content:"";position:absolute;inset:0;background:radial-gradient(ellipse 50% 60% at 85% 40%,rgba(0,194,110,.28),transparent 70%)}
.hero-g{position:relative;display:grid;grid-template-columns:1fr 1.05fr;gap:3rem;align-items:center}
.pill{display:inline-block;margin:0 0 1rem;font-family:var(--head);font-size:.88rem;padding:.25rem .9rem;border-radius:999px;background:rgba(0,194,110,.15);color:var(--green);border:1px solid rgba(0,194,110,.45)}
.hero h1{font-family:var(--head);font-weight:700;font-size:clamp(1.9rem,3.7vw,2.8rem);line-height:1.38;margin:0 0 1rem}
.lede{margin:0 0 1.6rem;color:#C9D4CE}
.acts{display:flex;flex-wrap:wrap;gap:.9rem}
.tiny{font-size:.86rem;color:#8E9C95;margin-top:1.2rem}
.hero-p{margin:0;position:relative}
.hero-p img{border-radius:22px}
.phone{position:absolute;left:-2rem;bottom:-2.5rem;width:200px;background:#fff;color:var(--ink);border-radius:26px;padding:1rem .85rem .85rem;border:6px solid #1B221E;box-shadow:0 20px 40px rgba(0,0,0,.45);animation:up .8s cubic-bezier(.2,.8,.3,1.2) .25s both}
@keyframes up{from{opacity:0;transform:translateY(30px)}to{opacity:1;transform:none}}
.phone p{margin:0}
.ph-top{display:flex;justify-content:space-between;font-family:var(--head);font-size:.8rem;color:var(--muted);margin-bottom:.5rem!important}
.ph-tab{display:flex;gap:.3rem;font-size:.72rem;margin-bottom:.6rem!important}
.ph-tab b,.ph-tab span{padding:.1rem .45rem;border-radius:6px;background:var(--surface)}
.ph-tab b{background:var(--green);font-weight:600}
.ph-nums{display:flex;gap:.35rem;margin-bottom:.6rem!important}
.ph-nums b{flex:1;text-align:center;font-family:var(--head);font-size:1.25rem;padding:.25rem 0;border-radius:10px;background:var(--sun)}
.ph-sum{display:flex;justify-content:space-between;align-items:center;font-size:.75rem}
.ph-sum b{background:var(--ink);color:var(--green);padding:.2rem .55rem;border-radius:8px;font-family:var(--head)}

.main{max-width:46rem;margin-inline:auto;padding:3.5rem 0 4rem}
.main h2{font-family:var(--head);font-weight:700;font-size:clamp(1.45rem,2.5vw,1.9rem);line-height:1.5;margin:3.25rem 0 1rem}
.main h2::before{content:"";display:block;width:36px;height:6px;border-radius:3px;background:var(--green);margin-bottom:.7rem}
.main h3{font-family:var(--head);font-weight:600;font-size:1.18rem;margin:1.5rem 0 .4rem;color:var(--green-d)}
.main p{margin:0 0 1.1rem}

.box{background:var(--ink);color:#fff;border-radius:24px;padding:1.5rem}
.box-row{display:flex;align-items:center;gap:1rem;flex-wrap:wrap;margin-bottom:1rem}
.box-logo{display:inline-flex;padding:.55rem .9rem;border-radius:12px;background:#1B221E;border:1px solid #2A332E}
.box-logo img{width:129px;height:30px}
.box-t{margin:0!important;font-family:var(--head);font-weight:600;font-size:1.15rem}
.box-specs{display:grid;grid-template-columns:repeat(4,1fr);gap:.5rem;margin:0 0 1.2rem}
.box-specs div{background:#1B221E;border-radius:14px;padding:.65rem .75rem}
.box-specs dt{font-size:.8rem;color:#8E9C95}
.box-specs dd{margin:0;font-family:var(--head);font-weight:600;color:var(--green);line-height:1.4}

.parts{list-style:none;counter-reset:p;padding:0;margin:1.25rem 0;display:grid;grid-template-columns:repeat(2,1fr);gap:.8rem}
.parts li{counter-increment:p;background:var(--surface);border-radius:18px;padding:1rem 1.1rem}
.parts li::before{content:counter(p,decimal-leading-zero);font-family:var(--head);font-weight:700;color:var(--green-d);font-size:1.4rem}
.parts h3{margin:.1rem 0 .3rem;color:var(--ink)}
.parts p{margin:0;font-size:.96rem;color:var(--muted)}

.tw{overflow-x:auto;margin:1.25rem 0 1.5rem;border-radius:18px;background:var(--surface)}
table{border-collapse:collapse;width:100%;min-width:600px;font-size:.96rem}
caption{text-align:left;padding:.8rem 1rem;font-family:var(--head);font-weight:600}
th,td{padding:.7rem .9rem;text-align:left;vertical-align:top;border-top:1px solid var(--line)}
th{background:var(--ink);color:#fff;font-weight:500}
td:first-child{font-weight:600}
td:last-child{font-family:var(--head);font-weight:600;color:var(--green-d);white-space:nowrap}

.chk{list-style:none;padding:0;margin:1.25rem 0;display:grid;gap:.5rem}
.chk li{position:relative;padding:.8rem 1rem .8rem 3.1rem;border-radius:14px;border:2px solid var(--line)}
.chk li::before{content:"";position:absolute;left:1rem;top:1rem;width:20px;height:20px;border-radius:6px;background:var(--green);box-shadow:inset 0 0 0 4px #fff,0 0 0 2px var(--green)}
.chk b{display:block;font-family:var(--head);font-weight:600}

.pic{margin:2.25rem 0;border-radius:22px;overflow:hidden;background:var(--surface)}
.pic figcaption{padding:.7rem 1rem;font-size:.92rem;color:var(--muted)}

.faq details{background:var(--surface);border-radius:16px;margin-bottom:.5rem}
.faq summary{cursor:pointer;list-style:none;padding:.9rem 2.8rem .9rem 1.1rem;font-family:var(--head);font-weight:600;position:relative}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"";position:absolute;right:1.1rem;top:50%;width:10px;height:10px;margin-top:-7px;border-right:3px solid var(--green-d);border-bottom:3px solid var(--green-d);transform:rotate(45deg);transition:transform .2s}
.faq details[open] summary::after{transform:rotate(-135deg);margin-top:-2px}
.faq details p{padding:0 1.1rem 1rem;margin:0;color:var(--muted)}

.who{display:flex;gap:1.25rem;align-items:center;margin-top:3rem;padding:1.4rem;border-radius:22px;background:var(--surface)}
.who-img{flex:none;width:96px;height:96px;border-radius:28px;object-fit:cover;border:3px solid var(--green)}
.who-name{font-family:var(--head);font-weight:700;margin:0 0 .2rem!important;font-size:1.15rem}
.who p{margin:0;font-size:.97rem}

.fo{background:var(--ink);color:#B9C6BF;padding:2.5rem 0 5.5rem;font-size:.93rem}
.fo a{color:var(--green)}
.fo .age b{display:inline-grid;place-items:center;width:2.6rem;height:2.6rem;border-radius:12px;background:var(--coral);color:#fff;margin-right:.5rem;font-family:var(--head)}
.fo .copy{opacity:.7}
.dock{display:none}

@media (max-width:560px){.who{flex-direction:column;align-items:flex-start}.who-img{width:80px;height:80px}.parts{grid-template-columns:1fr}}
@media (max-width:900px){
  .hd nav{display:none}
  .hd .btn-mini{margin-left:auto}
  .hero{padding:2rem 0 3.5rem}
  .hero-g{grid-template-columns:1fr;gap:2rem}
  .phone{left:.5rem;bottom:-2rem;width:170px}
  .box-specs{grid-template-columns:repeat(2,1fr)}
  body{font-size:1.03rem}
  .dock{display:block;position:fixed;left:.75rem;right:.75rem;bottom:.75rem;z-index:6;text-align:center;font-family:var(--head);font-weight:600;background:var(--green);color:var(--ink);text-decoration:none;padding:.9rem;border-radius:16px;box-shadow:0 10px 28px rgba(0,0,0,.35);padding-bottom:calc(.9rem + env(safe-area-inset-bottom,0px))}
}

/* table of contents */
.toc{margin:2rem 0 0;background:#F2F5F3;border:1px solid #DDE5E0;border-radius:14px}
.toc summary{cursor:pointer;list-style:none;padding:.85rem 1.1rem;font-weight:700;color:#009957;display:flex;justify-content:space-between;align-items:center}
.toc summary::-webkit-details-marker{display:none}
.toc summary::after{content:"▾";transition:transform .2s}
.toc[open] summary::after{transform:rotate(180deg)}
.toc ol{margin:0;padding:0 1.1rem 1rem 2.4rem;columns:2;column-gap:2rem;font-size:.97rem}
.toc li{break-inside:avoid;margin:.2rem 0;color:#4E5A54}
.toc a{color:#0B0F0D;text-decoration:none}
.toc a:hover{color:#009957;text-decoration:underline}
h2[id]{scroll-margin-top:84px}
@media (max-width:640px){.toc ol{columns:1}}