/* ============================================================
   TALING NGAM INTERNATIONAL ACADEMY — Phase 1
   Built by Cherry Rock
   Motion philosophy: calm, premium, unhurried. Award-level
   smoothness, not spectacle. Mobile treated as first-class.
   ============================================================ */

/* ---------- TOKENS ---------- */
:root{
  --ocean:#83b3ba; --teal:#5E8A8C; --teal-deep:#4C7A7C;
  --sage:#88a28a; --sandstone:#98867b; --coastal-sand:#D9D3C7;
  --tropical:#386148;
  --warm-white:#F2F2E6; --paper:#F2F2E6; --stone:#C6BCAD;
  --ink:#243230; --ink-soft:#586762; --line:#E7E1D6;

  --bg:var(--warm-white); --bg-alt:var(--paper);
  --serif:"Cardo",Georgia,serif;
  --sans:"Montserrat",-apple-system,sans-serif;

  --maxw:1200px;
  --gutter:clamp(1.25rem,5vw,4.5rem);
  --section-y:clamp(4.5rem,11vw,9rem);
  --radius:16px; --radius-sm:10px;
  --ease:cubic-bezier(.22,1,.36,1);
  --ease-soft:cubic-bezier(.4,0,.2,1);
  --dur:.8s;
}

/* ---------- RESET ---------- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
html.has-smooth{scroll-behavior:auto} /* JS smooth takes over */
body{
  font-family:var(--sans);color:var(--ink);background:var(--bg);
  line-height:1.68;font-size:clamp(1rem,1.05vw,1.12rem);
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
img{max-width:100%;display:block;height:auto}
a{color:inherit;text-decoration:none}
::selection{background:var(--ocean);color:#fff}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto!important}
  *,*::before,*::after{animation-duration:.001ms!important;transition-duration:.001ms!important}
}

/* ---------- TYPE ---------- */
h1,h2,h3{font-family:var(--serif);color:var(--ink);font-weight:500;line-height:1.08;letter-spacing:-.01em}
h1{font-size:clamp(2.7rem,7vw,5.2rem)}
h2{font-size:clamp(2.1rem,5vw,3.5rem)}
h3{font-size:clamp(1.35rem,2.6vw,1.9rem)}
.eyebrow{font-family:var(--sans);font-size:.76rem;font-weight:700;letter-spacing:.24em;text-transform:uppercase;color:var(--teal)}
.lead{font-size:clamp(1.18rem,2.1vw,1.5rem);line-height:1.55;color:var(--ink-soft);font-family:var(--serif);font-style:italic}
p+p{margin-top:1.1rem}

/* ---------- LAYOUT ---------- */
.wrap{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-block:var(--section-y);position:relative}
.section--alt{background:var(--bg-alt)}
.measure{max-width:60ch}
.center{text-align:center}
.center .measure{margin-inline:auto}

/* ---------- SCROLL PROGRESS ---------- */
.progress{position:fixed;top:0;left:0;height:3px;width:100%;z-index:100;background:transparent;pointer-events:none}
.progress__bar{height:100%;width:0;background:linear-gradient(90deg,var(--ocean),var(--teal));transform-origin:left;transition:width .1s linear}

/* ---------- TOPBAR ---------- */
.topbar{
  position:fixed;inset:0 0 auto 0;z-index:90;
  display:flex;align-items:center;justify-content:space-between;
  padding:.6rem var(--gutter);
  background:color-mix(in srgb,var(--warm-white) 82%,transparent);
  backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
  border-bottom:1px solid transparent;
  transition:transform .5s var(--ease),border-color .5s var(--ease),background .5s var(--ease);
}
.topbar.is-scrolled{border-bottom-color:var(--line)}
.topbar.is-hidden{transform:translateY(-100%)}
.topbar__brand{display:flex;align-items:center;gap:.6rem;font-family:var(--serif);font-size:1.2rem;color:var(--ink)}
.topbar__brand img{height:48px;width:auto}
.topbar__right{display:flex;align-items:center;gap:1.25rem}
.topbar__social{display:flex;gap:.6rem}
.topbar__social a{font-size:.8rem;letter-spacing:.05em;color:var(--ink-soft);transition:color .3s}
.topbar__social a:hover{color:var(--teal)}

/* ---------- BUTTON ---------- */
.btn{
  --pad-y:.8rem;--pad-x:1.6rem;
  display:inline-flex;align-items:center;gap:.5rem;position:relative;
  font-family:var(--sans);font-weight:700;font-size:.9rem;letter-spacing:.02em;
  padding:var(--pad-y) var(--pad-x);border-radius:100px;
  background:var(--teal);color:#fff;border:1px solid var(--teal);
  cursor:pointer;overflow:hidden;
  transition:transform .35s var(--ease),background .35s var(--ease),box-shadow .35s var(--ease);
  will-change:transform;
}
.btn::after{content:"";position:absolute;inset:0;background:var(--teal-deep);transform:translateY(101%);transition:transform .4s var(--ease);z-index:-1}
.btn:hover{background:var(--teal);box-shadow:0 10px 30px -8px rgba(76,122,124,.5)}
.btn:hover::after{transform:translateY(0)}
.btn:active{transform:scale(.97)}
.btn--lg{--pad-y:1rem;--pad-x:2.2rem;font-size:1rem}
.btn--light{background:#fff;color:var(--teal-deep);border-color:#fff}
.btn--light::after{background:var(--paper)}

/* ---------- HERO ---------- */
.hero{position:relative;min-height:100svh;display:grid;align-items:end;color:#fff;overflow:hidden}
.hero__media{position:absolute;inset:0;z-index:0}
.hero__media img{width:100%;height:100%;object-fit:cover;transform:scale(1.08);will-change:transform}
.hero__media::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(36,50,48,.15) 0%,rgba(36,50,48,.1) 40%,rgba(36,50,48,.72) 100%)}
.hero__inner{position:relative;z-index:2;padding-bottom:clamp(3rem,8vh,7rem)}
.hero .eyebrow{color:rgba(255,255,255,.9);margin-bottom:1rem}
.hero h1{color:#fff;max-width:11ch;margin-bottom:.4rem;text-wrap:balance}
.hero__tagline{font-family:var(--serif);font-style:italic;font-size:clamp(1.4rem,3vw,2.1rem);color:rgba(255,255,255,.95);margin-bottom:1.2rem}
.hero__sub{font-size:clamp(1rem,1.6vw,1.2rem);color:rgba(255,255,255,.9);max-width:46ch;margin-bottom:.5rem}
.hero__meta{font-size:.78rem;letter-spacing:.2em;text-transform:uppercase;color:rgba(255,255,255,.82);margin-bottom:2rem}
.hero__scroll{position:absolute;bottom:1.5rem;left:50%;transform:translateX(-50%);z-index:2;display:flex;flex-direction:column;align-items:center;gap:.5rem;font-size:.68rem;letter-spacing:.2em;text-transform:uppercase;color:rgba(255,255,255,.7)}
.hero__scroll .line{width:1px;height:34px;background:rgba(255,255,255,.5);animation:scrolldrop 2s var(--ease) infinite}
@keyframes scrolldrop{0%{transform:scaleY(0);transform-origin:top}40%{transform:scaleY(1);transform-origin:top}60%{transform:scaleY(1);transform-origin:bottom}100%{transform:scaleY(0);transform-origin:bottom}}

/* ---------- SECTION HEADINGS ---------- */
.sec-head{margin-bottom:clamp(2rem,4vw,3.5rem)}
.sec-head .eyebrow{display:block;margin-bottom:1rem}
.sec-head h2{max-width:18ch}
.center .sec-head h2{margin-inline:auto}

/* ---------- WHY / PILLARS ---------- */
.pillars{display:grid;gap:1.5rem 1rem;grid-template-columns:repeat(auto-fit,minmax(160px,1fr))}
.pillar{text-align:center;padding:1.5rem 1rem}
.pillar__icon{width:52px;height:52px;margin:0 auto 1rem;color:var(--teal)}
.pillar__icon svg{width:100%;height:100%;stroke:var(--teal);stroke-width:1.4;fill:none}
.pillar h3{font-size:1.15rem;margin-bottom:.35rem}
.pillar p{font-size:.92rem;color:var(--ink-soft);line-height:1.5}

/* ---------- SPLIT (image + text) ---------- */
.split{display:grid;gap:clamp(2rem,5vw,4.5rem);align-items:center;grid-template-columns:1fr 1fr}
.split--rev .split__media{order:2}
.split__media{position:relative;border-radius:var(--radius);overflow:hidden;aspect-ratio:4/5}
.split__media img{width:100%;height:100%;object-fit:cover;transform:scale(1.06);will-change:transform}
.split__body h2{margin-bottom:1.3rem}
.split__body .lead{margin-bottom:1.2rem}

/* ---------- EXPLORE SUBBLOCKS ---------- */
.subs{display:grid;gap:1.25rem;margin-top:2.5rem}
.sub{padding:1.75rem 0;border-top:1px solid var(--line)}
.sub h3{color:var(--teal-deep);margin-bottom:.5rem}
.sub p{color:var(--ink-soft);max-width:64ch}

/* ---------- IMAGE REVEAL MASK ---------- */
.reveal-img{position:relative;overflow:hidden}
.reveal-img img{transition:transform 1.4s var(--ease);transform:scale(1.12)}
.reveal-img.in img{transform:scale(1.02)}
.reveal-img::after{content:"";position:absolute;inset:0;background:var(--paper);transform:translateY(0);transition:transform 1.1s var(--ease)}
.reveal-img.in::after{transform:translateY(-101%)}

/* ---------- STRUCTURES GALLERY ---------- */
.gallery{display:grid;gap:1rem;grid-template-columns:repeat(3,1fr);margin-top:2.5rem}
.gallery figure{position:relative;border-radius:var(--radius-sm);overflow:hidden;aspect-ratio:3/4}
.gallery img{width:100%;height:100%;object-fit:cover;transition:transform .8s var(--ease)}
.gallery figure:hover img{transform:scale(1.05)}
.gallery figcaption{position:absolute;left:0;bottom:0;right:0;padding:1rem;font-size:.82rem;color:#fff;background:linear-gradient(transparent,rgba(36,50,48,.7));font-weight:600}

/* ---------- FEATURE BAND (place / belong) ---------- */
.band{position:relative;color:#fff;text-align:center;overflow:hidden;background:var(--teal)}
.band__media{position:absolute;inset:0;z-index:0}
.band__media img{width:100%;height:100%;object-fit:cover}
.band__media::after{content:"";position:absolute;inset:0;background:linear-gradient(rgba(36,50,48,.5),rgba(36,50,48,.62))}
.band .wrap{position:relative;z-index:2}
.band h2{color:#fff;font-size:clamp(1.6rem,3.75vw,2.6rem);text-wrap:balance}
.band .lead{color:rgba(255,255,255,.92)}

/* ---------- FOUNDER ---------- */
.founder{background:var(--bg-alt)}
.founder__quote{font-family:var(--serif);font-style:italic;font-size:clamp(1.5rem,3vw,2.3rem);color:var(--teal-deep);max-width:20ch;line-height:1.2}
.founder__quote cite{display:block;font-size:.9rem;font-style:normal;font-family:var(--sans);color:var(--ink-soft);margin-top:1rem;letter-spacing:.05em}

/* ---------- REGISTER ---------- */
.register{background:var(--ink);color:#fff}
.register h2{color:#fff}
.register .lead{color:rgba(255,255,255,.85)}
.register__grid{display:grid;gap:clamp(2rem,5vw,4rem);grid-template-columns:1fr 1.1fr;align-items:start;margin-top:2.5rem}
.register__form{background:var(--warm-white);border-radius:var(--radius);padding:clamp(.5rem,2vw,1.25rem);min-height:520px}
.register__form iframe{width:100%;border:0;border-radius:var(--radius-sm);height:520px;display:block}
.register__follow h3{color:#fff;margin-bottom:.75rem}
.register__follow p{color:rgba(255,255,255,.8);margin-bottom:1.5rem}
.register__social{display:flex;gap:1rem}
.register__social a{display:inline-flex;align-items:center;gap:.5rem;padding:.7rem 1.2rem;border:1px solid rgba(255,255,255,.25);border-radius:100px;font-size:.9rem;transition:background .3s,border-color .3s}
.register__social a:hover{background:rgba(255,255,255,.1);border-color:rgba(255,255,255,.5)}

/* ---------- FOOTER ---------- */
.footer{background:var(--ink);color:rgba(255,255,255,.7);padding-block:3.5rem 2rem;border-top:1px solid rgba(255,255,255,.1)}
.footer__grid{display:flex;flex-wrap:wrap;align-items:flex-start;gap:2rem 4rem;justify-content:flex-start}
.footer a{color:rgba(255,255,255,.85);transition:color .3s}
.footer a:hover{color:#fff}
.footer__col p{font-size:.9rem;line-height:1.9}
.footer__legal{margin-top:2.5rem;padding-top:1.5rem;border-top:1px solid rgba(255,255,255,.1);display:flex;flex-wrap:wrap;justify-content:space-between;gap:1rem;font-size:.78rem;color:rgba(255,255,255,.5)}
.footer__legal .thai{font-size:.82rem}
.disclaimer{font-size:.72rem;color:rgba(255,255,255,.4);font-style:italic;margin-top:.5rem}

/* ---------- REVEAL SYSTEM ---------- */
.reveal{opacity:0;transform:translateY(26px);transition:opacity var(--dur) var(--ease),transform var(--dur) var(--ease)}
.reveal.in{opacity:1;transform:none}
.reveal-d1{transition-delay:.08s}.reveal-d2{transition-delay:.16s}.reveal-d3{transition-delay:.24s}.reveal-d4{transition-delay:.32s}
.hero .reveal{transform:translateY(34px)}

/* ---------- MOBILE STICKY CTA ---------- */
.mobile-cta{position:fixed;left:0;right:0;bottom:0;z-index:80;padding:.75rem var(--gutter);background:color-mix(in srgb,var(--warm-white) 92%,transparent);backdrop-filter:blur(12px);border-top:1px solid var(--line);transform:translateY(120%);transition:transform .5s var(--ease);display:none}
.mobile-cta.show{transform:translateY(0)}
.mobile-cta .btn{width:100%;justify-content:center}

/* ---------- RESPONSIVE ---------- */
@media (max-width:860px){
  .split{grid-template-columns:1fr;gap:2rem}
  .split--rev .split__media{order:0}
  .split__media{aspect-ratio:4/3}
  .register__grid{grid-template-columns:1fr}
  .gallery{grid-template-columns:1fr;gap:1rem}
  .gallery figure{aspect-ratio:16/10}
}
@media (max-width:620px){
  .topbar__social{display:none}
  .topbar .btn{display:none} /* replaced by mobile-cta bar */
  .mobile-cta{display:block}
  .hero{min-height:92svh}
  .hero__media img{transform:scale(1.04)} /* less zoom on mobile */
  .pillars{grid-template-columns:1fr 1fr;gap:1rem}
  .footer__legal{flex-direction:column}
  /* gentler reveals on mobile */
  .reveal{transform:translateY(18px)}
  .reveal-img::after{transition-duration:.8s}
}