/* Chaiyen Research Group — shared stylesheet */
:root{
  --navy:#0f2a52; --blue:#1f4e9c; --blue-2:#2f6fd0; --sky:#e8f0fb;
  --ink:#1b1f27; --muted:#5b6575; --line:#e3e8ef; --bg:#ffffff; --soft:#f6f8fb;
  --accent:#16a085; --radius:14px; --shadow:0 10px 30px rgba(15,42,82,.08);
  --max:1180px; --nav-h:76px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--nav-h) + 16px)}
body{margin:0;font-family:"Poppins","Noto Sans Thai",Arial,sans-serif;color:var(--ink);background:var(--bg);line-height:1.7;font-size:16px}
img{max-width:100%;height:auto;display:block}
a{color:var(--blue);text-decoration:none}
a:hover{color:var(--blue-2);text-decoration:underline}
h1,h2,h3,h4{line-height:1.25;color:var(--navy);margin:0 0 .6em}
h1{font-family:"Playfair Display",Georgia,serif;font-size:clamp(2rem,4vw,3rem)}
h2{font-family:"Playfair Display",Georgia,serif;font-size:clamp(1.6rem,3vw,2.2rem)}
h3{font-size:1.2rem}
p{margin:0 0 1em}
.container{max-width:var(--max);margin:0 auto;padding:0 24px}
.skip{position:absolute;left:-999px}.skip:focus{left:12px;top:12px;z-index:999;background:#fff;padding:8px 12px}

/* ---------- Header / navigation ---------- */
.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.97);backdrop-filter:saturate(1.4) blur(8px);border-bottom:1px solid var(--line)}
.nav-wrap{display:flex;align-items:center;justify-content:space-between;height:var(--nav-h);max-width:1320px;margin:0 auto;padding:0 20px}
.brand{display:flex;flex-direction:column;line-height:1.15;color:var(--navy)}
.brand:hover{text-decoration:none;color:var(--navy)}
.brand b{font-family:"Playfair Display",Georgia,serif;font-size:1.35rem}
.brand small{font-size:.72rem;color:var(--muted);letter-spacing:.04em}
.menu{display:flex;list-style:none;margin:0;padding:0;gap:2px}
.menu>li{position:relative}
.menu>li>a,.menu>li>button{display:flex;align-items:center;gap:6px;padding:10px 12px;font:600 .9rem/1 "Poppins",Arial,sans-serif;color:var(--ink);background:none;border:0;border-radius:8px;cursor:pointer;white-space:nowrap}
.menu>li>a:hover,.menu>li>button:hover,.menu>li.open>button,.menu>li.active>a,.menu>li.active>button{color:var(--blue);background:var(--sky);text-decoration:none}
.caret{width:8px;height:8px;border-right:2px solid currentColor;border-bottom:2px solid currentColor;transform:rotate(45deg) translateY(-2px);transition:transform .2s}
.menu>li.open .caret{transform:rotate(225deg) translateY(-2px)}
.dropdown{position:absolute;top:calc(100% + 6px);left:0;min-width:250px;background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow);list-style:none;margin:0;padding:8px;opacity:0;visibility:hidden;transform:translateY(6px);transition:.18s ease}
.menu>li:last-child .dropdown,.menu>li:nth-last-child(2) .dropdown{left:auto;right:0}
.menu>li.open>.dropdown{opacity:1;visibility:visible;transform:none}
@media (hover:hover) and (min-width:1101px){.menu>li:hover>.dropdown{opacity:1;visibility:visible;transform:none}.menu>li:hover .caret{transform:rotate(225deg) translateY(-2px)}}
.dropdown a{display:block;padding:9px 12px;border-radius:8px;color:var(--blue);font-weight:600;font-size:.9rem}
.dropdown a:hover,.dropdown a.current{background:var(--sky);text-decoration:none}
.dropdown .sub a{padding-left:28px;font-weight:500;color:var(--ink);font-size:.86rem}
.dropdown .sub a::before{content:"•";margin-right:8px;color:var(--blue)}
.dropdown .sep{height:1px;background:var(--line);margin:6px 4px}
.burger{display:none;width:44px;height:44px;border:1px solid var(--line);background:#fff;border-radius:10px;cursor:pointer;align-items:center;justify-content:center}
.burger span,.burger span::before,.burger span::after{display:block;width:20px;height:2px;background:var(--navy);position:relative;content:"";transition:.2s}
.burger span::before{position:absolute;top:-6px}.burger span::after{position:absolute;top:6px}
.nav-open .burger span{background:transparent}.nav-open .burger span::before{top:0;transform:rotate(45deg)}.nav-open .burger span::after{top:0;transform:rotate(-45deg)}
@media (max-width:1100px){
  .site-header{backdrop-filter:none;-webkit-backdrop-filter:none;background:#fff}
  .burger{display:flex}
  .menu{position:fixed;inset:var(--nav-h) 0 0 0;flex-direction:column;gap:0;background:#fff;padding:12px 16px 40px;overflow-y:auto;transform:translateX(100%);transition:transform .25s}
  .nav-open .menu{transform:none}
  .menu>li{border-bottom:1px solid var(--line)}
  .menu>li>a,.menu>li>button{width:100%;justify-content:space-between;padding:16px 8px;font-size:1rem}
  .dropdown{position:static;opacity:1;visibility:visible;transform:none;box-shadow:none;border:0;padding:0 0 10px 8px;display:none;min-width:0}
  .menu>li.open>.dropdown{display:block}
}

/* ---------- Page hero ---------- */
.hero{position:relative;color:#fff;background:linear-gradient(120deg,rgba(0, 0, 0, 0.5),rgba(255, 255, 255, 0.2)),url("../images/bg_3.jpg") center/cover no-repeat;padding:110px 0 120px}
.hero h1{color:#fff;font-size:clamp(2.2rem,5vw,3.6rem);max-width:820px}
.hero p{max-width:720px;font-size:1.1rem;opacity:.95}
.hero .eyebrow{display:inline-block;font-size:.8rem;letter-spacing:.14em;text-transform:uppercase;background:rgba(255,255,255,.14);padding:6px 12px;border-radius:999px;margin-bottom:18px}
.page-head{background:linear-gradient(120deg, rgba(0, 31, 63, 0.1), rgba(0, 116, 217, 0.8)),url("../images/bg_2.jpg") center/cover no-repeat;color:#fff;padding:64px 0 56px}
.page-head h1{color:#fff;margin-bottom:.2em}
.page-head p{opacity:.9;margin:0;max-width:760px}
.crumbs{font-size:.85rem;opacity:.85;margin-bottom:10px}
.crumbs a{color:#fff}

/* ---------- Layout helpers ---------- */
.section{padding:72px 0}
.section.soft{background:var(--soft)}
.section-title{margin-bottom:32px}
.section-title .kicker{color:var(--blue);font-weight:600;letter-spacing:.1em;text-transform:uppercase;font-size:.8rem}
.grid{display:grid;gap:24px}
.g2{grid-template-columns:repeat(2,1fr)}.g3{grid-template-columns:repeat(3,1fr)}.g4{grid-template-columns:repeat(4,1fr)}
@media (max-width:900px){.g3,.g4{grid-template-columns:repeat(2,1fr)}}
@media (max-width:640px){.g2,.g3,.g4{grid-template-columns:1fr}.section{padding:52px 0}}
.split{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center}
.split.rev{grid-template-columns:.9fr 1.1fr}
@media (max-width:900px){.split,.split.rev{grid-template-columns:1fr;gap:28px}}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:0 2px 0 rgba(0,0,0,.01);transition:.2s}
.card:hover{box-shadow:var(--shadow);transform:translateY(-2px)}
.card h3 a{color:inherit}
.card .num{display:inline-flex;width:36px;height:36px;border-radius:10px;background:var(--sky);color:var(--blue);font-weight:700;align-items:center;justify-content:center;margin-bottom:12px}
.card-img{padding:0;overflow:hidden}
.card-img img{width:100%;object-fit:cover;padding:22px}
.card-img .body{padding:22px}
.btn{display:inline-block;padding:11px 20px;border-radius:10px;background:var(--blue);color:#fff;font-weight:600;font-size:.92rem;border:0}
.btn:hover{background:var(--navy);color:#fff;text-decoration:none}
.btn.ghost{background:transparent;border:1.5px solid currentColor;color:var(--blue)}
.hero .btn.ghost{color:#fff}
.btn-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:22px}
.figure{margin:28px 0;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:14px}
.figure img{margin:0 auto;border-radius:8px}
.figure figcaption{font-size:.85rem;color:var(--muted);text-align:center;margin-top:10px}
.prose{max-width:860px}
.prose p{text-align:justify;hyphens:auto}
.lead{font-size:1.12rem;color:#333}
.tag{display:inline-block;font-size:.75rem;font-weight:600;color:var(--blue);background:var(--sky);padding:3px 10px;border-radius:999px;margin:0 6px 6px 0}
.muted{color:var(--muted)}
.portrait{border-radius:var(--radius);box-shadow:var(--shadow)}

/* stats */
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:18px}
.stat{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;text-align:center}
.stat b{display:block;font-size:2.1rem;color:var(--blue);font-family:"Playfair Display",Georgia,serif;line-height:1.1}
.stat span{font-size:.88rem;color:var(--muted)}

/* timeline / lists */
.timeline{list-style:none;margin:0;padding:0;border-left:2px solid var(--line)}
.timeline li{position:relative;padding:0 0 18px 24px}
.timeline li::before{content:"";position:absolute;left:-7px;top:8px;width:12px;height:12px;border-radius:50%;background:#fff;border:3px solid var(--blue)}
.timeline .yr{font-weight:700;color:var(--blue);margin-right:8px}
.cv-block{margin-bottom:40px}
.cv-block h2{font-size:1.5rem;border-bottom:2px solid var(--sky);padding-bottom:8px}

/* highlight items */
.hl{display:grid;grid-template-columns:120px 1fr;gap:20px;padding:22px 0;border-bottom:1px solid var(--line)}
.hl .when{font-weight:700;color:var(--blue)}
.hl .when small{display:block;color:var(--muted);font-weight:500}
.hl h3{font-size:1.08rem;margin-bottom:6px}
@media (max-width:640px){.hl{grid-template-columns:1fr;gap:6px}}

/* publications */
.bars{display:flex;align-items:flex-end;gap:6px;height:200px;padding:10px 0 0;border-bottom:1px solid var(--line);overflow-x:auto}
.bars .bar{flex:1 0 22px;display:flex;flex-direction:column;align-items:center;justify-content:flex-end;height:100%}
.bars .bar i{display:block;width:100%;background:linear-gradient(var(--blue-2),var(--blue));border-radius:6px 6px 0 0}
.bars .bar em{font-style:normal;font-size:.72rem;color:var(--muted);margin-top:4px}
.bars .bar b{font-size:.72rem;color:var(--navy)}
.pub-tools{display:flex;gap:12px;flex-wrap:wrap;align-items:center;margin:20px 0}
.pub-tools input,.pub-tools select{padding:10px 14px;border:1px solid var(--line);border-radius:10px;font:inherit;min-width:220px}
.pub-year{margin-top:30px}
.pub-year h3{color:var(--blue);border-bottom:2px solid var(--sky);padding-bottom:6px}
.pub-list{padding-left:1.4em}
.pub-list li{margin-bottom:12px}

/* gallery + lightbox */
.gallery{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px}
.gallery a{display:block;border-radius:12px;overflow:hidden;background:var(--soft)}
.gallery img{width:100%;aspect-ratio:4/3;object-fit:cover;transition:transform .3s}
.gallery a:hover img{transform:scale(1.04)}
.gallery figure{margin:0}
.gallery figcaption{font-size:.85rem;color:var(--muted);padding:8px 2px}
.lightbox{position:fixed;inset:0;background:rgba(5,12,25,.9);display:none;align-items:center;justify-content:center;z-index:500;padding:24px;cursor:zoom-out}
.lightbox.show{display:flex}
.lightbox img{max-height:90vh;max-width:95vw;border-radius:8px}

/* members */
.member{text-align:center}
.member img{width:140px;height:140px;border-radius:50%;object-fit:cover;margin:0 auto 12px;background:var(--sky)}
.member h4{margin:0;font-size:1rem}
.member p{font-size:.85rem;color:var(--muted);margin:0}
.notice{background:var(--sky);border-left:4px solid var(--blue);padding:14px 18px;border-radius:8px;color:var(--navy)}

/* media */
.media-item{display:grid;grid-template-columns:200px 1fr;gap:20px;align-items:start}
.media-item img{border-radius:10px;aspect-ratio:4/3;object-fit:cover;width:100%}
@media (max-width:640px){.media-item{grid-template-columns:1fr}}
.news-table{width:100%;border-collapse:collapse;font-size:.93rem}
.news-table th,.news-table td{text-align:left;padding:12px 10px;border-bottom:1px solid var(--line);vertical-align:top}
.news-table th{color:var(--navy);background:var(--soft)}
.video{position:relative;padding-top:56.25%;border-radius:12px;overflow:hidden;background:#000}
.video iframe{position:absolute;inset:0;width:100%;height:100%;border:0}

/* map */
.map{border:0;width:100%;height:380px;border-radius:var(--radius)}

/* footer */
.site-footer{background:var(--navy);color:#c9d4e6;padding:56px 0 24px;font-size:.92rem}
.site-footer h4{color:#fff;font-size:1rem;margin-bottom:14px}
.site-footer a{color:#c9d4e6}.site-footer a:hover{color:#fff}
.site-footer ul{list-style:none;padding:0;margin:0}.site-footer li{margin-bottom:6px}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:32px}
@media (max-width:900px){.foot-grid{grid-template-columns:1fr 1fr}}
@media (max-width:560px){.foot-grid{grid-template-columns:1fr}}
.copy{border-top:1px solid rgba(255,255,255,.12);margin-top:36px;padding-top:18px;font-size:.82rem;text-align:center}
.to-top{position:fixed;right:18px;bottom:18px;width:44px;height:44px;border-radius:50%;background:var(--blue);color:#fff;border:0;box-shadow:var(--shadow);cursor:pointer;opacity:0;visibility:hidden;transition:.2s;font-size:1.2rem}
.to-top.show{opacity:1;visibility:visible}
/* ===== Brand logo (ย้ายมาจาก css/style.css เดิม) ===== */
.navbar-brand{display:inline-block;font-weight:700;font-size:20px;line-height:1;
  text-transform:uppercase;white-space:nowrap;color:var(--blue)}
.navbar-brand:hover{text-decoration:none}
.navbar-brand span{display:block;font-size:11px;font-weight:600}

/* ===== ให้ปุ่ม ☰ อยู่ชิดขวาบนมือถือ/แท็บเล็ต ===== */
@media (max-width:1100px){
  .nav-wrap>nav{position:absolute;width:0;height:0}
}

/* ===== Journal covers (วางต่อท้าย assets/site.css) ===== */
.covers-block{margin:48px 0 8px}
.covers-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:16px}
.covers-head h2{margin:0}
.covers-nav{display:flex;gap:8px}
.covers-btn{width:42px;height:42px;border-radius:50%;border:1px solid var(--line);background:#fff;color:var(--blue);font-size:1.6rem;line-height:1;cursor:pointer;transition:.2s}
.covers-btn:hover{background:var(--blue);color:#fff;border-color:var(--blue)}
.covers{display:flex;gap:20px;overflow-x:auto;scroll-snap-type:x mandatory;scroll-behavior:smooth;padding:4px 2px 16px;-webkit-overflow-scrolling:touch;scrollbar-width:thin}
.covers .cover{flex:0 0 190px;margin:0;scroll-snap-align:start;text-align:center}
.covers .cover a[data-lightbox]{display:block;border-radius:10px;overflow:hidden;box-shadow:0 6px 18px rgba(15,42,82,.15);background:var(--soft)}
.covers .cover img{width:100%;height:250px;object-fit:cover;display:block;transition:transform .3s}
.covers .cover a:hover img{transform:scale(1.04)}
.covers .cover figcaption{font-size:.85rem;font-weight:600;margin-top:10px;color:var(--muted)}
@media (max-width:640px){.covers .cover{flex-basis:150px}.covers .cover img{height:200px}}

/* ----- หน้า CV (cv.html) ----- */
.cv-profile{display:grid;grid-template-columns:240px 1fr;gap:36px;align-items:start}
@media (max-width:700px){.cv-profile{grid-template-columns:1fr}.cv-profile img{max-width:240px}}
.cv-profile h2{margin-bottom:.3em}
.cv-jump{display:flex;flex-wrap:wrap;gap:8px;margin:28px 0 0}
.cv-jump a{font-size:.8rem;font-weight:600;padding:6px 12px;border-radius:999px;background:var(--sky);color:var(--blue)}
.cv-jump a:hover{background:var(--blue);color:#fff;text-decoration:none}
.cv-block{margin-bottom:44px}
.cv-block h2{font-size:1.45rem;border-bottom:2px solid var(--sky);padding-bottom:8px}
.cv-block h3{font-size:1.02rem;color:var(--blue);margin:18px 0 8px}
.cv-list{padding-left:1.6em;margin:0}
.cv-list li{margin-bottom:8px}
.cv-more summary{list-style:none;cursor:pointer;display:flex;align-items:center;justify-content:space-between;gap:12px;border-bottom:2px solid var(--sky);margin-bottom:14px}
.cv-more summary::-webkit-details-marker{display:none}
.cv-more summary h2{border:0;margin:0;padding-bottom:8px}
.cv-more .count{font:600 .8rem/1 Poppins,Arial,sans-serif;color:var(--blue);background:var(--sky);padding:4px 10px;border-radius:999px;vertical-align:middle;margin-left:6px}
.cv-more .toggle{width:12px;height:12px;border-right:2px solid var(--blue);border-bottom:2px solid var(--blue);transform:rotate(45deg);transition:.2s;flex:none;margin-right:6px}
.cv-more[open] .toggle{transform:rotate(225deg)}
.tags .tag{font-weight:500}
.cv-two{display:grid;grid-template-columns:1fr 1fr;gap:40px}
@media (max-width:900px){.cv-two{grid-template-columns:1fr}}

/* ----- หน้า Highlighted Findings (highlight.html) ----- */
.hl-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
@media (max-width:980px){.hl-grid{grid-template-columns:repeat(2,1fr)}}
@media (max-width:640px){.hl-grid{grid-template-columns:1fr}}
.hl-card{display:flex;flex-direction:column;background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:.2s}
.hl-card:hover{box-shadow:var(--shadow);transform:translateY(-3px)}
.hl-img{position:relative;display:block;aspect-ratio:4/3;background:var(--soft);overflow:hidden}
.hl-img img{width:100%;height:100%;object-fit:cover;transition:transform .35s}
.hl-card:hover .hl-img img{transform:scale(1.05)}
.hl-badge{position:absolute;top:12px;left:12px;background:#c0392b;color:#fff;font-size:.72rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase;padding:5px 10px;border-radius:999px;box-shadow:0 4px 10px rgba(0,0,0,.2)}
.hl-meta{display:flex;align-items:stretch;font-size:.8rem;font-weight:600}
.hl-meta .j{background:var(--blue);color:#fff;padding:8px 14px}
.hl-meta .d{background:var(--sky);color:var(--navy);padding:8px 14px}
.hl-body{padding:18px 20px 22px;display:flex;flex-direction:column;flex:1}
.hl-body h3{font-size:1.02rem;line-height:1.4;margin-bottom:10px}
.hl-body h3 a{color:var(--navy)}
.hl-body p{font-size:.9rem;color:var(--muted);margin-bottom:14px}
.hl-body .doi{margin-top:auto;font-size:.82rem;word-break:break-all}