:root{
  /* Faculty dusty blue (official) */
  --blue:#5A86AD; --blue-deep:#3f6a90; --slate:#788494; --blue-mist:#dde7f0;
  /* Chula pink (official #DE5C8E = สีประจำวันพระราชสมภพ ร.5) + graphic shades */
  --pink:#DE5C8E; --pink-bright:#FF86B4; --coral:#F8616A; --pink-deep:#c23e6a;
  /* neutrals */
  --bg:#f6f8fb; --surface:#ffffff; --surface-2:#eef2f6;
  --ink:#27333d; --ink-soft:#586672; --ink-faint:#69767f;
  --line:rgba(39,51,61,.12); --line-strong:rgba(39,51,61,.24);
  --fd:'IBM Plex Sans Thai',system-ui,sans-serif; --fb:var(--fd); --fl:'Chonburi','IBM Plex Sans Thai',sans-serif;
  --maxw:1160px; --ease:cubic-bezier(.22,1,.36,1);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--fb);background:var(--bg);color:var(--ink);line-height:1.62;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
h1,h2,h3{font-family:var(--fd);font-weight:700;line-height:1.12;color:var(--blue-deep)}
.shell{max-width:var(--maxw);margin:0 auto;padding:0 clamp(20px,4vw,40px)}
.eyebrow{font-size:.72rem;letter-spacing:.26em;text-transform:uppercase;color:var(--pink-deep);font-weight:600;display:inline-block;margin-bottom:12px}
.eyebrow.bl{color:var(--blue-deep)}
.more{font-weight:600;font-size:.86rem;color:var(--pink-deep);display:inline-flex;gap:.4em;align-items:center}
:focus-visible{outline:2px solid var(--pink);outline-offset:3px;border-radius:4px}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5em;font-family:var(--fb);font-weight:600;font-size:.92rem;padding:.74em 1.5em;border-radius:100px;border:1px solid var(--blue-deep);background:transparent;color:var(--blue-deep);cursor:pointer;transition:transform .25s var(--ease),background .25s,color .25s}
.btn:hover{transform:translateY(-2px);background:var(--blue-deep);color:#fff}
.btn--pink{background:var(--pink);border-color:var(--pink);color:#fff}
.btn--pink:hover{background:var(--pink-deep);border-color:var(--pink-deep);color:#fff}

/* nav */
.nav{position:sticky;top:0;z-index:50;background:color-mix(in srgb,var(--bg) 86%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav__in{display:flex;align-items:center;justify-content:space-between;height:74px}
.brand{display:flex;align-items:center;gap:12px}
.brand__mark{width:44px;height:44px;border-radius:50%;background:radial-gradient(circle at 34% 30%,var(--pink-bright),var(--pink));color:#fff;display:grid;place-items:center;font-family:var(--fl);font-size:1.15rem;box-shadow:0 6px 16px -8px var(--pink)}
.brand b{font-family:var(--fl);font-size:1rem;letter-spacing:.03em;display:block;line-height:1.15;color:var(--ink)}
.brand span{font-size:.67rem;color:var(--ink-soft)}
.links{display:flex;gap:24px;align-items:center}
.links a{font-size:.88rem;font-weight:500;color:var(--ink-soft);position:relative;padding:4px 0;transition:color .2s}
.links a::after{content:'';position:absolute;left:0;bottom:-2px;width:100%;height:1.5px;background:var(--pink);transform:scaleX(0);transform-origin:left;transition:transform .3s var(--ease)}
.links a:hover{color:var(--ink)}.links a:hover::after{transform:scaleX(1)}
.navtoggle{display:none;width:44px;height:44px;border:1px solid var(--line);border-radius:10px;background:none;color:var(--ink);font-size:1.3rem;cursor:pointer;place-items:center}
.mobilemenu{display:none;flex-direction:column;background:var(--bg);border-bottom:1px solid var(--line);padding:8px clamp(20px,4vw,40px) 16px}
.mobilemenu.open{display:flex}
.mobilemenu a{padding:13px 0;border-bottom:1px solid var(--line);font-weight:600;color:var(--ink)}
.mobilemenu .btn--pink{margin-top:14px}

/* hero */
.hero{padding:64px 0 52px}
.hero__grid{display:grid;grid-template-columns:1.05fr .95fr;gap:50px;align-items:center}
.hero h1{font-size:clamp(2.4rem,5.2vw,4.2rem);letter-spacing:-.015em;margin-top:6px}
.hero h1 .pink{color:var(--pink-deep)}
.hero__lede{font-size:clamp(1rem,1.5vw,1.18rem);color:var(--ink-soft);max-width:520px;margin:22px 0 30px}
.hero__cta{display:flex;gap:14px;flex-wrap:wrap}
.hero__media{position:relative}
.hero__media .frame{position:relative;z-index:2;border-radius:16px;overflow:hidden;border:8px solid var(--surface);box-shadow:0 30px 60px -28px rgba(39,51,61,.4);aspect-ratio:4/5}
.hero__media .frame img{width:100%;height:100%;object-fit:cover}
.hero__media::before{content:'';position:absolute;z-index:1;right:-20px;top:-20px;width:60%;height:74%;background:var(--blue-mist);border-radius:16px}
.hero__badge{position:absolute;z-index:3;left:-16px;bottom:24px;background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:14px 18px;box-shadow:0 18px 36px -20px rgba(39,51,61,.35)}
.hero__badge b{font-family:var(--fd);font-size:1.5rem;color:var(--pink-deep);display:block;line-height:1}
.hero__badge span{font-size:.76rem;color:var(--ink-soft)}

/* stats */
.stats{display:flex;flex-wrap:wrap;border:1px solid var(--line);border-radius:16px;background:var(--surface);overflow:hidden}
.stat{flex:1 1 0;min-width:140px;padding:20px 24px;border-right:1px solid var(--line)}
.stat:last-child{border-right:none}
.stat .v{font-family:var(--fd);font-weight:700;font-size:1.5rem;color:var(--blue-deep);line-height:1}
.stat .v.pk{color:var(--pink-deep)}
.stat .l{font-size:.86rem;font-weight:600;margin-top:5px}
.stat .n{font-size:.72rem;color:var(--ink-faint)}

/* section */
.section{padding:80px 0}
.head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:36px}
.head h2{font-size:clamp(1.8rem,3.6vw,2.8rem)}

/* news */
.news{display:grid;grid-template-columns:1.45fr 1fr;gap:26px}
.feat{display:block;border:1px solid var(--line);border-radius:18px;overflow:hidden;background:var(--surface);transition:transform .3s var(--ease),box-shadow .3s}
.feat:hover{transform:translateY(-4px);box-shadow:0 22px 44px -28px rgba(39,51,61,.35)}
.feat__img{aspect-ratio:16/9;overflow:hidden}
.feat__img img{width:100%;height:100%;object-fit:cover;transition:transform .6s var(--ease)}
.feat:hover .feat__img img{transform:scale(1.05)}
.feat__b{padding:24px 26px 28px}
.meta{display:flex;gap:12px;align-items:center;font-size:.78rem;color:var(--ink-faint)}
.tag{color:var(--pink-deep);font-weight:700;letter-spacing:.06em;text-transform:uppercase;font-size:.7rem}
.feat h3{font-size:clamp(1.4rem,2.4vw,2rem);margin:10px 0 8px}
.feat p{color:var(--ink-soft);font-size:.95rem}
.nlist{display:flex;flex-direction:column}
.nrow{display:block;padding:18px 8px;border-top:1px solid var(--line);border-radius:10px;transition:background .2s}
.nrow:hover{background:var(--surface)}
.nrow h3{font-size:1.18rem;margin-top:6px;color:var(--ink)}

/* services list */
.svclist{display:grid;grid-template-columns:1fr 1fr;gap:0 54px}
.svcrow{display:grid;grid-template-columns:1fr auto;align-items:center;gap:2px 14px;padding:22px 8px;border-top:1px solid var(--line);border-radius:10px;transition:background .25s}
.svcrow:hover{background:var(--surface)}
.svcrow h3{font-size:1.3rem}
.svcrow p{grid-column:1;color:var(--ink-soft);font-size:.88rem}
.svcrow .arrow{grid-row:1/3;align-self:center;font-size:1.2rem;color:var(--blue);transition:.25s var(--ease)}
.svcrow:hover .arrow{color:var(--pink-deep);transform:translateX(4px)}

/* gallery */
.gal{display:grid;grid-template-columns:repeat(6,1fr);grid-auto-rows:160px;gap:14px}
.gal figure{position:relative;overflow:hidden;border-radius:16px;margin:0}
.gal img{width:100%;height:100%;object-fit:cover;transition:transform .7s var(--ease)}
.gal figure:hover img{transform:scale(1.07)}
.gal figcaption{position:absolute;inset:auto 0 0 0;padding:14px 16px;color:#fff;font-weight:600;background:linear-gradient(transparent,rgba(20,30,40,.82));opacity:0;transform:translateY(8px);transition:.35s var(--ease)}
.gal figure:hover figcaption{opacity:1;transform:none}
.gal .a{grid-column:span 3;grid-row:span 2}.gal .b{grid-column:span 3}.gal .c{grid-column:span 2}

/* slideshow (ภาพกิจกรรม) */
.slideshow{position:relative;border-radius:22px;overflow:hidden;height:clamp(360px,56vh,560px);background:#0d1822;box-shadow:0 30px 60px -34px rgba(39,51,61,.5)}
.slide{position:absolute;inset:0;opacity:0;transition:opacity 1s var(--ease);z-index:1}
.slide.active{opacity:1;z-index:2}
.slide img{width:100%;height:100%;object-fit:cover;transform:scale(1.06)}
.slide.active img{animation:ken 6.5s ease-out forwards}
@keyframes ken{from{transform:scale(1.06)}to{transform:scale(1.18) translate(-2%,-1.5%)}}
.slide .cap{position:absolute;left:0;right:0;bottom:0;padding:26px 30px 32px;color:#fff;background:linear-gradient(transparent,rgba(13,24,34,.85));z-index:3}
.slide .cap b{font-family:var(--fd);font-weight:700;font-size:clamp(1.3rem,2.6vw,2rem);display:block}
.slide .cap span{font-size:.9rem;opacity:.92}
.sld-nav{position:absolute;top:50%;transform:translateY(-50%);z-index:4;width:48px;height:48px;border-radius:50%;border:none;background:rgba(255,255,255,.85);color:var(--blue-deep);font-size:1.3rem;cursor:pointer;display:grid;place-items:center;transition:background .2s,transform .2s}
.sld-nav:hover{background:#fff;transform:translateY(-50%) scale(1.08)}
.sld-prev{left:18px}.sld-next{right:18px}
.sld-dots{position:absolute;bottom:18px;left:50%;transform:translateX(-50%);z-index:5;display:flex;gap:9px}
.sld-dots button{width:9px;height:9px;border-radius:50%;border:none;background:rgba(255,255,255,.5);cursor:pointer;padding:0;transition:.25s var(--ease)}
.sld-dots button.on{background:var(--pink);width:26px;border-radius:5px}
@media(prefers-reduced-motion:reduce){.slide{transition:none}.slide.active img{animation:none}}

/* video gallery */
.videos{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:20px}
.vid{border:1px solid var(--line);border-radius:16px;overflow:hidden;background:var(--surface);transition:transform .3s var(--ease),box-shadow .3s}
.vid:hover{transform:translateY(-4px);box-shadow:0 22px 44px -28px rgba(39,51,61,.35)}
.vid__frame{position:relative;aspect-ratio:16/9;background:#000}
.vid__frame iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.vid__t{padding:14px 18px;font-weight:600;font-size:.95rem;color:var(--ink)}

/* blog (บทความ) */
.bloglist{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:22px}
.blogcard{display:block;border:1px solid var(--line);border-radius:16px;overflow:hidden;background:var(--surface);transition:transform .3s var(--ease),box-shadow .3s}
.blogcard:hover{transform:translateY(-4px);box-shadow:0 22px 44px -28px rgba(39,51,61,.35)}
.blogcard__img{aspect-ratio:16/9;overflow:hidden}
.blogcard__img img{width:100%;height:100%;object-fit:cover;transition:transform .6s var(--ease)}
.blogcard:hover .blogcard__img img{transform:scale(1.05)}
.blogcard__b{padding:18px 20px 22px}
.blogcard h3{font-size:1.2rem;margin:8px 0 6px}
.blogcard p{color:var(--ink-soft);font-size:.9rem}

/* calendar (ปฏิทินกิจกรรม) */
.cal{display:grid;grid-template-columns:1.1fr .9fr;gap:34px;align-items:start}
.calcard{border:1px solid var(--line);border-radius:18px;background:var(--surface);padding:22px 24px}
.cal__head{display:flex;justify-content:space-between;align-items:center;margin-bottom:14px}
.cal__head h3{font-size:1.2rem;color:var(--blue-deep)}
.calgrid{display:grid;grid-template-columns:repeat(7,1fr);gap:6px}
.calgrid .dow{text-align:center;font-size:.72rem;color:var(--ink-faint);font-weight:600;padding:4px 0}
.calgrid .day{aspect-ratio:1;display:flex;align-items:center;justify-content:center;border-radius:9px;font-size:.9rem;color:var(--ink)}
.calgrid .day.empty{visibility:hidden}
.calgrid .day.today{outline:2px solid var(--blue);font-weight:700}
.calgrid .day.has{background:var(--pink);color:#fff;font-weight:700}
.evlist{display:flex;flex-direction:column;gap:10px}
.evlist h3{font-size:1.05rem;color:var(--blue-deep);margin-bottom:4px}
.evrow{display:flex;gap:14px;align-items:flex-start;border:1px solid var(--line);border-radius:12px;padding:12px 14px;background:var(--surface)}
.evrow .d{flex:none;width:56px;text-align:center;background:var(--blue-mist);border-radius:9px;padding:7px 0}
.evrow .d b{display:block;font-size:1.25rem;color:var(--blue-deep);line-height:1}
.evrow .d span{font-size:.66rem;color:var(--ink-soft)}
.evrow .info b{display:block;font-size:.98rem;color:var(--ink)}
.evrow .info span{font-size:.82rem;color:var(--ink-soft)}
@media(max-width:820px){.cal{grid-template-columns:1fr}}

/* journal teaser */
.jrn{display:grid;grid-template-columns:.78fr 1.22fr;gap:50px;align-items:center}
.cover{display:flex;aspect-ratio:3/4;border-radius:8px;background:linear-gradient(150deg,var(--coral) 0%,var(--pink) 45%,var(--blue) 100%);position:relative;overflow:hidden;box-shadow:20px 26px 54px -28px rgba(39,51,61,.45);flex-direction:column;justify-content:space-between;padding:28px;color:#fff}
.cover::after{content:'';position:absolute;inset:0;background:radial-gradient(circle at 78% 16%,rgba(255,255,255,.18),transparent 44%)}
.cover b{font-family:var(--fl);font-size:1.4rem;letter-spacing:.05em;position:relative}
.cover .iss{font-family:var(--fd);font-weight:700;font-size:2.2rem;line-height:1;position:relative}
.cover .sub{position:relative;font-size:.78rem;letter-spacing:.18em;opacity:.86}
.jrn h2{font-size:clamp(1.8rem,3.6vw,2.6rem)}

/* honor */
.honor-wrap{background:var(--blue-mist);border-radius:24px;padding:46px clamp(24px,4vw,48px)}
.hr{display:grid;grid-template-columns:54px 1fr auto;gap:24px;align-items:center;padding:22px 0;border-top:1px solid rgba(39,51,61,.16)}
.hr:first-of-type{border-top:none}
.hr .no{font-family:var(--fd);color:var(--pink-deep);font-size:1.4rem;font-weight:700}
.hr .ar{font-size:clamp(1.2rem,2.4vw,1.7rem);font-weight:600;color:var(--blue-deep)}
.hr .nt{color:var(--ink-soft);font-size:.9rem;max-width:340px;text-align:right}

/* footer */
.footer{background:var(--surface-2);border-top:1px solid var(--line);padding:60px 0 36px}
.ftop{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:36px}
.ftop h2{font-size:clamp(1.6rem,3vw,2.3rem)}
.ftop p{color:var(--ink-soft);margin:14px 0 22px;max-width:380px}
.fcol h4{font-size:.72rem;letter-spacing:.18em;text-transform:uppercase;color:var(--ink-faint);margin-bottom:14px}
.fcol ul{list-style:none;display:grid;gap:10px}
.fcol a{color:var(--ink-soft);font-size:.93rem;transition:color .2s}.fcol a:hover{color:var(--pink-deep)}
.addr{font-size:.9rem;color:var(--ink-soft);line-height:1.7}
.fbar{margin-top:44px;padding-top:20px;border-top:1px solid var(--line);display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px;font-size:.78rem;color:var(--ink-faint)}

/* ===== inner pages (article / content) ===== */
.page{max-width:760px;margin:0 auto;padding:44px 24px 90px}
.page--wide{max-width:920px}
.crumb{font-size:.84rem;color:var(--ink-soft);margin-bottom:18px;display:inline-flex;gap:.5em;align-items:center}
.crumb a{color:var(--blue-deep);font-weight:600}.crumb a:hover{color:var(--pink-deep)}
.page h1{font-size:clamp(1.9rem,4.4vw,3rem);line-height:1.16;margin:6px 0}
.page .lead{font-size:1.15rem;color:var(--ink-soft);margin:14px 0}
.page__img{border-radius:16px;overflow:hidden;margin:26px 0;aspect-ratio:16/9}
.page__img img{width:100%;height:100%;object-fit:cover}
.prose p{font-size:1.06rem;line-height:1.85;color:var(--ink);margin-bottom:1.1em}
.prose h2{font-size:1.5rem;margin:1.3em 0 .4em;color:var(--blue-deep)}
.prose h3{font-size:1.25rem;margin:1.1em 0 .3em;color:var(--ink)}
.prose ul{margin:0 0 1.1em 1.2em;color:var(--ink)}.prose li{margin-bottom:.4em}
.prose blockquote{margin:1.5em 0;padding:1em 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);font-size:1.35rem;color:var(--blue-deep);text-align:center}
.related{border-top:1px solid var(--line);margin-top:40px;padding-top:24px}
.related h4{font-size:.72rem;letter-spacing:.18em;text-transform:uppercase;color:var(--ink-faint);margin-bottom:14px}
.related a{display:flex;justify-content:space-between;gap:16px;padding:14px 0;border-bottom:1px solid var(--line)}
.related a b{color:var(--ink)}.related a span{color:var(--pink-deep);font-size:.84rem;white-space:nowrap}

/* reveal */
.rv{opacity:0;transform:translateY(22px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.rv.in{opacity:1;transform:none}
.d1{transition-delay:.07s}.d2{transition-delay:.14s}.d3{transition-delay:.21s}

@media(max-width:980px){
  .links,.nav__in .btn--pink{display:none}
  .navtoggle{display:grid}
  .hero__grid{grid-template-columns:1fr;gap:36px}.hero__media{max-width:420px}
  .news{grid-template-columns:1fr}
  .jrn{grid-template-columns:1fr;gap:30px}.cover{max-width:260px}
  .svclist{grid-template-columns:1fr}
  .gal{grid-template-columns:repeat(2,1fr);grid-auto-rows:150px}
  .gal .a,.gal .b,.gal .c{grid-column:span 1;grid-row:span 1}
  .hr{grid-template-columns:40px 1fr}.hr .nt{display:none}
  .ftop{grid-template-columns:1fr}
}
@media(max-width:540px){.stat{flex-basis:50%;border-bottom:1px solid var(--line)}.hero__cta{flex-direction:column;align-items:stretch}}
@media(prefers-reduced-motion:reduce){
  .rv{opacity:1!important;transform:none!important;transition:none!important}
  .feat:hover,.feat:hover .feat__img img,.gal figure:hover img{transform:none!important}
}