/* ============ TOKENS ============ */
:root{
  --green:#64A231; --green-d:#4f8226; --green-l:#B7D69B; --green-xl:#eef5e4;
  --pink:#EB649B; --pink-d:#d44d84; --pink-l:#F9D3E6; --pink-xl:#fdeff5;
  --lime:#BDFF3C; --yellow:#FFFF22;
  --ink:#1b2015; --ink-soft:#5d6552; --ink-faint:#9aa28d;
  --bg:#fbfcf8; --bg-soft:#f1f4ea; --paper:#ffffff; --line:#e6e9dc;
  --brand:var(--green); --brand-d:var(--green-d); --brand-soft:var(--green-xl); --brand-l:var(--green-l);
  --brand2:var(--pink); --brand2-soft:var(--pink-xl);
  --accent:var(--pink); --accent-ink:#ffffff; --accent-d:var(--pink-d);
  --font-display:'Anuphan'; --font-body:'IBM Plex Sans Thai';
  --maxw:1180px;
  --shadow:0 1px 2px rgba(27,32,21,.04), 0 18px 38px -22px rgba(27,32,21,.30);
  --shadow-lg:0 30px 70px -34px rgba(27,32,21,.44);
}
[data-primary="pink"]{
  --brand:var(--pink); --brand-d:var(--pink-d); --brand-soft:var(--pink-xl); --brand-l:var(--pink-l);
  --brand2:var(--green); --brand2-soft:var(--green-xl);
}
[data-accent="lime"]{ --accent:var(--lime); --accent-ink:#172012; --accent-d:#9ee01f; }
[data-accent="yellow"]{ --accent:var(--yellow); --accent-ink:#1f2008; --accent-d:#ecec10; }
[data-accent="pink"]{ --accent:var(--pink); --accent-ink:#fff; --accent-d:var(--pink-d); }
[data-accent="green"]{ --accent:var(--green); --accent-ink:#fff; --accent-d:var(--green-d); }
[data-font="kanit"]{ --font-display:'Kanit'; }

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font-body),system-ui,sans-serif;color:var(--ink);background:var(--bg);line-height:1.7;-webkit-font-smoothing:antialiased;overflow-x:clip}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
h1,h2,h3,h4,.display{font-family:var(--font-display),var(--font-body),sans-serif;line-height:1.12;font-weight:700;letter-spacing:-.01em}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}
::selection{background:var(--brand);color:#fff}
.wrap{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 clamp(26px,6vw,40px)}
.eyebrow{font-weight:600;font-size:13px;letter-spacing:.16em;text-transform:uppercase;color:var(--brand-d)}
.en{font-family:var(--font-display);letter-spacing:.32em;text-transform:uppercase}

/* ============ CONSTELLATION ============ */
#constellation{position:fixed;inset:0;width:100%;height:100%;z-index:0;pointer-events:none}
[data-constellation="false"] #constellation{display:none}
.page{position:relative;z-index:1}

/* ============ NAV ============ */
.nav{position:fixed;top:0;left:0;right:0;z-index:60;display:flex;align-items:center;justify-content:space-between;gap:20px;
  padding:14px clamp(16px,4vw,40px);background:rgba(251,252,248,.72);backdrop-filter:blur(14px) saturate(150%);
  -webkit-backdrop-filter:blur(14px) saturate(150%);border-bottom:1px solid transparent;transition:.3s}
.nav.scrolled{border-bottom-color:var(--line);background:rgba(251,252,248,.93)}
.nav-brand{display:flex;align-items:center;gap:11px;font-family:var(--font-display);font-weight:700;font-size:16px;letter-spacing:.02em}
.nav-brand img{width:34px;height:34px}
.nav-brand .yr{color:var(--brand)}
.nav-brand small{display:block;font-family:var(--font-body);font-weight:500;font-size:10px;letter-spacing:.18em;color:var(--ink-faint);text-transform:uppercase;margin-top:-2px}
.nav-links{display:flex;align-items:center;gap:2px}
.nav-links a{font-size:14.5px;font-weight:500;color:var(--ink-soft);padding:8px 13px;border-radius:10px;transition:.18s}
.nav-links a:hover{background:var(--brand-soft);color:var(--brand-d)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-family:var(--font-body);font-weight:600;cursor:pointer;border:none;border-radius:999px;transition:transform .15s,filter .2s,box-shadow .25s,background .2s;white-space:nowrap}
.btn:active{transform:translateY(1px)}
.btn-cta{background:var(--accent);color:var(--accent-ink);padding:10px 20px;font-size:14.5px;box-shadow:0 10px 24px -12px color-mix(in srgb,var(--accent) 70%,transparent)}
.btn-cta:hover{filter:brightness(.96);transform:translateY(-1px);box-shadow:0 14px 30px -12px color-mix(in srgb,var(--accent) 80%,transparent)}
.btn-lg{padding:16px 32px;font-size:17px}
.btn-ghost{background:transparent;color:var(--ink);padding:10px 20px;font-size:14.5px;border:1.5px solid var(--line)}
.btn-ghost:hover{border-color:var(--brand);color:var(--brand-d)}
.menu-btn{display:none;border:1.5px solid var(--line);background:var(--paper);width:42px;height:42px;border-radius:11px;cursor:pointer;align-items:center;justify-content:center}
.menu-btn i,.menu-btn i::before,.menu-btn i::after{display:block;width:18px;height:2px;background:var(--ink);border-radius:2px;position:relative;content:""}
.menu-btn i::before{position:absolute;top:-6px}.menu-btn i::after{position:absolute;top:6px}
.mobile-menu{position:fixed;top:68px;left:0;right:0;z-index:55;background:rgba(251,252,248,.98);backdrop-filter:blur(16px);border-bottom:1px solid var(--line);
  padding:8px 18px 18px;transform:translateY(-130%);transition:transform .32s cubic-bezier(.3,.8,.3,1);box-shadow:var(--shadow-lg);display:none}
.mobile-menu.show{transform:translateY(0)}
.mobile-menu a{display:block;padding:13px 8px;font-size:16px;font-weight:600;border-bottom:1px solid var(--line)}
.mobile-menu .btn-cta{display:flex;margin-top:14px;width:100%}

/* ============ STORY SPINE ============ */
.connector{position:relative;height:118px;display:flex;justify-content:center}
.connector .rail{position:absolute;top:0;bottom:0;width:2px;background:var(--brand-l);opacity:.5;border-radius:2px}
.connector .fill{position:absolute;top:0;width:2px;height:100%;background:linear-gradient(var(--brand),var(--brand2));transform:scaleY(0);transform-origin:top center;border-radius:2px}
/* the traveling dot is the Samsen 45 emblem riding down the spine */
.connector .comet{position:absolute;top:0;left:50%;width:48px;height:26px;margin-left:-24px;margin-top:-13px;
  background:url(assets/logo-mark-green.png) center/contain no-repeat;
  filter:drop-shadow(0 0 8px color-mix(in srgb,var(--brand) 60%,transparent));
  opacity:0;transition:opacity .3s}
.connector.drawing .comet{opacity:1}
@media (prefers-reduced-motion:reduce){.connector .fill{transform:scaleY(1)!important}}
.node{position:relative;width:100%;display:flex;justify-content:center;margin-bottom:4px;z-index:3}
.node .dot{width:16px;height:16px;border-radius:50%;background:var(--paper);border:2px solid var(--brand-l);position:relative;transition:.45s cubic-bezier(.2,.8,.2,1)}
.node .dot::after{content:"";position:absolute;inset:3px;border-radius:50%;background:var(--brand);transform:scale(0);transition:.45s cubic-bezier(.2,.8,.2,1)}
.node.alt .dot::after{background:var(--brand2)}
.node.lit .dot{border-color:var(--brand);box-shadow:0 0 0 6px color-mix(in srgb,var(--brand) 13%,transparent),0 0 22px color-mix(in srgb,var(--brand) 32%,transparent)}
.node.alt.lit .dot{border-color:var(--brand2);box-shadow:0 0 0 6px color-mix(in srgb,var(--brand2) 13%,transparent),0 0 22px color-mix(in srgb,var(--brand2) 32%,transparent)}
.node.lit .dot::after{transform:scale(1)}

/* ============ SECTION SCAFFOLD ============ */
section{position:relative;z-index:2;scroll-margin-top:90px}
.sec-pad{padding:6px 0 14px}
.band{background:var(--bg-soft);border-block:1px solid var(--line)}
.sec-head{text-align:center;max-width:720px;margin:0 auto 30px}
.sec-head .eyebrow{display:block;margin-bottom:14px}
.sec-head h2{font-size:clamp(30px,4.4vw,46px)}
.sec-head p{color:var(--ink-soft);font-size:17px;margin-top:16px;text-wrap:pretty}
.reveal{opacity:1}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1}}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none}}