/* ============ STC — สภานักเรียน ============ */
:root{
  --bg:#F7F8FC;
  --surface:#FFFFFF;
  --tint-blue:#EAF6FD;
  --tint-pink:#FDEEF6;
  --ink:#1F2340;
  --ink-soft:#575C78;
  --line:#DCE0EE;
  --blue:#8FD3F4;
  --blue-deep:#2A74A8;
  --pink:#FFC0DD;
  --pink-deep:#C23B7E;
  --on-primary:#FFFFFF;
  --danger:#B3362F;
  --shadow:0 2px 10px rgba(31,35,64,.07);
  --radius:14px;
  --tabbar-h:68px;
}
[data-theme="dark"]{
  --bg:#14172A;
  --surface:#1E2238;
  --tint-blue:#1B2B40;
  --tint-pink:#2D2036;
  --ink:#EDEFFA;
  --ink-soft:#A4A9C6;
  --line:#343959;
  --blue:#5FB6E0;
  --blue-deep:#6DBDE8;
  --pink:#E091BC;
  --pink-deep:#F08AB9;
  --on-primary:#0F1226;
  --danger:#FF8A80;
  --shadow:0 2px 10px rgba(0,0,0,.35);
  color-scheme:dark;
}
*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}
html{scroll-behavior:smooth}
body{
  font-family:'Sarabun',system-ui,sans-serif;
  font-size:16px;line-height:1.55;color:var(--ink);
  background:
    radial-gradient(circle at 0% 0%, color-mix(in srgb,var(--blue) 22%,transparent), transparent 38%),
    radial-gradient(circle at 100% 8%, color-mix(in srgb,var(--pink) 24%,transparent), transparent 40%),
    var(--bg);
  background-attachment:fixed;
  min-height:100vh;
  padding-bottom:calc(var(--tabbar-h) + env(safe-area-inset-bottom,0px) + 24px);
}
h1,h2,h3,h4,.brand-th{font-family:'Kanit',sans-serif;font-weight:600;line-height:1.25}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;cursor:pointer}
:focus-visible{outline:3px solid var(--blue-deep);outline-offset:2px}
[hidden]{display:none !important}

/* ---------- Top bar ---------- */
.topbar{
  position:sticky;top:0;z-index:40;
  display:flex;align-items:center;gap:12px;
  padding:10px 16px;padding-top:calc(10px + env(safe-area-inset-top,0px));
  background:color-mix(in srgb,var(--bg) 88%,transparent);
  backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.brand{display:flex;align-items:center;gap:10px;min-width:0}
.logo-badge,.logo-img{
  width:40px;height:40px;border-radius:50%;flex-shrink:0;
  background:linear-gradient(135deg,var(--blue),var(--pink));
  display:flex;align-items:center;justify-content:center;
  font-family:'Kanit',sans-serif;font-weight:700;font-size:14px;color:#1F2340;
}
.brand-text{display:flex;flex-direction:column;line-height:1.15;min-width:0}
.brand-th{font-size:17px}
.brand-text small{font-size:11px;color:var(--ink-soft)}
.topbar-actions{margin-left:auto;display:flex;gap:8px}
.icon-btn,.lang-btn{
  height:44px;min-width:44px;border-radius:12px;
  border:1px solid var(--line);background:var(--surface);color:var(--ink);
  display:flex;align-items:center;justify-content:center;
}
.lang-btn{padding:0 14px;font-family:'Kanit',sans-serif;font-weight:600;font-size:14px;letter-spacing:.5px}
.icon-btn svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.ic-sun{display:none}
[data-theme="dark"] .ic-sun{display:block}
[data-theme="dark"] .ic-moon{display:none}

/* ---------- Layout ---------- */
main{max-width:720px;margin:0 auto;padding:20px 16px 8px}
.page{animation:fade .3s ease}
@keyframes fade{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.page-title{font-size:26px;margin-bottom:6px}
.page-sub{color:var(--ink-soft);margin-bottom:18px}
.section-title{
  font-size:19px;margin:30px 0 12px;padding-left:12px;
  border-left:4px solid var(--pink-deep);
}
.eyebrow{font-size:13px;font-weight:600;letter-spacing:.4px;color:var(--blue-deep);margin-bottom:6px}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  min-height:52px;padding:0 22px;border-radius:var(--radius);
  font-family:'Kanit',sans-serif;font-weight:600;font-size:17px;
  border:2px solid transparent;transition:transform .15s,background .2s;
}
.btn:active{transform:scale(.97)}
.btn-primary{background:var(--blue-deep);color:var(--on-primary)}
.btn-secondary{background:var(--surface);color:var(--ink);border-color:var(--line)}
.btn-block{width:100%;margin-top:20px}
.btn[disabled]{opacity:.6;pointer-events:none}

/* ---------- Hero ---------- */
.hero{
  position:relative;overflow:hidden;
  padding:26px 22px 24px;border-radius:22px;
  background:var(--tint-blue);border:1px solid var(--line);
}
.hero h1{font-size:30px;margin-bottom:8px;max-width:calc(100% - 90px)}
.hero-sub{color:var(--ink-soft);max-width:34ch;margin-bottom:20px}
.hero-actions{display:flex;flex-wrap:wrap;gap:10px}
.hero-actions .btn{flex:1 1 140px}
.hero-orbit{
  position:absolute;top:18px;right:18px;width:64px;height:64px;border-radius:50%;
  background:radial-gradient(circle at 35% 30%,#fff,var(--blue));
}
.hero-orbit::after{
  content:'';position:absolute;left:-42%;top:40%;width:184%;height:20%;
  border:2px solid var(--pink-deep);border-radius:50%;transform:rotate(-16deg);opacity:.8;
}

/* ---------- News / photos ---------- */
.scroll-row{display:flex;gap:12px;overflow-x:auto;padding:2px 2px 12px;scroll-snap-type:x mandatory}
.scroll-row::-webkit-scrollbar{height:6px}
.scroll-row::-webkit-scrollbar-thumb{background:var(--line);border-radius:6px}
.news-card{
  flex:0 0 78%;max-width:280px;scroll-snap-align:start;text-align:left;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;box-shadow:var(--shadow);
}
.news-thumb{height:96px;background:var(--tint-pink);position:relative}
.news-thumb::after{
  content:'';position:absolute;right:16px;bottom:-16px;width:56px;height:56px;border-radius:50%;
  background:radial-gradient(circle at 35% 30%,#fff,var(--blue));
}
.news-body{padding:14px}
.news-date{font-size:12px;color:var(--ink-soft);margin-bottom:4px}
.news-body h3{font-size:16px;margin-bottom:4px}
.news-body p{font-size:14px;color:var(--ink-soft)}

.photo-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.photo-tile{
  aspect-ratio:1/1;border-radius:12px;border:1px solid var(--line);
  background:linear-gradient(150deg,var(--tint-pink),var(--tint-blue));
  font-family:'Kanit',sans-serif;font-weight:600;font-size:20px;color:var(--ink-soft);
}

/* ---------- Forms ---------- */
.panel{background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:20px;box-shadow:var(--shadow)}
.field-label{display:block;font-size:14px;font-weight:600;margin:16px 0 8px}
.panel > .field-label:first-child{margin-top:0}
input,select,textarea{
  width:100%;min-height:50px;padding:12px 14px;border-radius:12px;
  border:1.5px solid var(--line);background:var(--bg);color:var(--ink);
  font-family:'Sarabun',sans-serif;font-size:16px;
}
textarea{resize:vertical;min-height:120px}
input:focus,select:focus,textarea:focus{border-color:var(--blue-deep);outline:none}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:2px}
@media (max-width:440px){.form-row{grid-template-columns:1fr}}
.check-row{
  display:flex;align-items:center;gap:12px;margin:18px 0 4px;
  min-height:52px;padding:10px 14px;border-radius:12px;cursor:pointer;
  background:var(--tint-pink);border:1px solid var(--line);font-weight:500;
}
.check-row input{width:22px;height:22px;min-height:0;accent-color:var(--pink-deep);flex-shrink:0}
.rules{list-style:none;display:flex;flex-direction:column;gap:8px;padding:14px 16px;border-radius:12px;background:var(--tint-blue)}
.rules li{position:relative;padding-left:22px;font-size:14px}
.rules li::before{content:'✓';position:absolute;left:0;color:var(--blue-deep);font-weight:700}

/* ---------- Works ---------- */
.video-box{
  aspect-ratio:16/9;border-radius:var(--radius);overflow:hidden;margin-bottom:16px;
  background:linear-gradient(160deg,#2a2d4a,#4a3a5c);
  display:flex;align-items:center;justify-content:center;
}
.video-box iframe{width:100%;height:100%;border:0}
.play-btn{
  width:60px;height:60px;border-radius:50%;background:rgba(255,255,255,.92);color:var(--pink-deep);
  display:flex;align-items:center;justify-content:center;font-size:22px;
}
.accordion{
  width:100%;min-height:56px;margin-top:10px;padding:0 16px;border-radius:var(--radius);
  display:flex;align-items:center;justify-content:space-between;
  background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow);
  font-family:'Kanit',sans-serif;font-weight:600;font-size:16.5px;text-align:left;
}
.chev{width:10px;height:10px;border-right:2.5px solid var(--ink-soft);border-bottom:2.5px solid var(--ink-soft);transform:rotate(-45deg);transition:transform .25s;margin-right:4px}
.accordion[aria-expanded="true"] .chev{transform:rotate(45deg)}
.acc-body{display:grid;gap:10px;padding:10px 0 4px}
.item-card{
  display:flex;align-items:center;gap:14px;width:100%;min-height:64px;padding:12px 14px;text-align:left;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
}
.item-card.active{border-color:var(--pink-deep);background:var(--tint-pink)}
.item-icon{
  width:44px;height:44px;border-radius:12px;flex-shrink:0;color:#1F2340;
  background:linear-gradient(135deg,var(--blue),var(--pink));
  display:flex;align-items:center;justify-content:center;font-size:15px;
}
.item-card h4{font-size:15px;margin-bottom:1px}
.item-card p{font-size:13px;color:var(--ink-soft)}
.folder-photos{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:14px}
.folder-photos div{aspect-ratio:1/1;border-radius:10px;background:linear-gradient(150deg,var(--tint-pink),var(--tint-blue));border:1px solid var(--line)}

/* ---------- Members ---------- */
.party-row{display:flex;gap:10px;overflow-x:auto;padding:2px 2px 14px;scroll-snap-type:x proximity}
.party-row::-webkit-scrollbar{display:none}
.party-chip{
  flex:0 0 auto;scroll-snap-align:start;min-height:52px;padding:0 18px 0 8px;border-radius:999px;
  display:flex;align-items:center;gap:10px;
  background:var(--surface);border:1.5px solid var(--line);
  font-family:'Kanit',sans-serif;font-weight:500;font-size:15px;
}
.party-chip .num{
  width:36px;height:36px;border-radius:50%;display:flex;align-items:center;justify-content:center;
  background:var(--tint-blue);color:var(--blue-deep);font-weight:700;
}
.party-chip[aria-selected="true"]{background:var(--blue-deep);border-color:var(--blue-deep);color:var(--on-primary)}
.party-chip[aria-selected="true"] .num{background:rgba(255,255,255,.25);color:inherit}
.member-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
@media (min-width:560px){.member-grid{grid-template-columns:repeat(3,1fr)}}
.member-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:16px 10px 14px;text-align:center;box-shadow:var(--shadow);
  border-top:4px solid var(--blue-deep);
}
.avatar{
  width:48px;height:48px;border-radius:50%;margin:0 auto 10px;color:#1F2340;
  background:linear-gradient(135deg,var(--blue),var(--pink));
  display:flex;align-items:center;justify-content:center;font-family:'Kanit',sans-serif;font-weight:600;
}
.member-card h4{font-size:14px;margin-bottom:2px}
.member-card p{font-size:12.5px;color:var(--ink-soft)}

/* ---------- Bottom tab bar ---------- */
.tabbar{
  position:fixed;left:0;right:0;bottom:0;z-index:40;
  display:grid;grid-template-columns:repeat(4,1fr);
  background:color-mix(in srgb,var(--surface) 94%,transparent);
  backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);
  border-top:1px solid var(--line);
  padding-bottom:env(safe-area-inset-bottom,0px);
}
.tabbar a{
  position:relative;height:var(--tabbar-h);
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;
  font-size:12.5px;font-weight:600;color:var(--ink-soft);
}
.tabbar svg{width:25px;height:25px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.tabbar a[aria-current="page"]{color:var(--blue-deep)}
.tabbar a[aria-current="page"]::before{
  content:'';position:absolute;top:0;left:30%;right:30%;height:3px;border-radius:0 0 3px 3px;background:var(--pink-deep);
}

/* ---------- Modal ---------- */
.modal-overlay{
  position:fixed;inset:0;z-index:100;background:rgba(20,23,42,.5);
  display:flex;align-items:flex-end;justify-content:center;padding:0;
}
.modal-box{
  position:relative;width:100%;max-width:480px;max-height:88vh;overflow-y:auto;
  background:var(--surface);border-radius:22px 22px 0 0;padding:26px 22px calc(22px + env(safe-area-inset-bottom,0px));
  border-top:5px solid var(--blue-deep);animation:sheet .28s ease;
}
@keyframes sheet{from{transform:translateY(30px);opacity:0}to{transform:none;opacity:1}}
@media (min-width:600px){
  .modal-overlay{align-items:center;padding:20px}
  .modal-box{border-radius:22px}
}
.modal-close{
  position:absolute;top:10px;right:10px;width:44px;height:44px;border-radius:50%;border:none;
  background:var(--tint-blue);font-size:17px;
}
.modal-icon{
  width:64px;height:64px;border-radius:50%;margin:4px auto 14px;color:#fff;font-size:28px;
  display:flex;align-items:center;justify-content:center;
}
.modal-icon.ok{background:var(--blue-deep);color:var(--on-primary)}
.modal-icon.err{background:var(--danger);color:#fff}
.modal-title{font-family:'Kanit',sans-serif;font-weight:600;font-size:19px;text-align:center;margin-bottom:6px}
.modal-text{color:var(--ink-soft);text-align:center}
.modal-title.left,.modal-text.left{text-align:left}
.modal-title.left{padding-right:40px}
.id-head{display:flex;align-items:center;gap:14px;margin-bottom:14px;padding-right:40px}
.id-head .avatar{margin:0;width:60px;height:60px;flex-shrink:0}
.id-row{display:flex;justify-content:space-between;gap:12px;padding:11px 0;border-bottom:1px dashed var(--line)}
.id-row span:first-child{color:var(--ink-soft)}
.id-row span:last-child{font-weight:600;text-align:right}
.viewer{display:flex;gap:12px;overflow-x:auto;scroll-snap-type:x mandatory;margin:34px -4px 0}
.viewer::-webkit-scrollbar{display:none}
.viewer div{
  flex:0 0 100%;aspect-ratio:1/1;scroll-snap-align:center;border-radius:16px;border:1px solid var(--line);
  background:linear-gradient(150deg,var(--tint-pink),var(--tint-blue));
  display:flex;align-items:center;justify-content:center;
  font-family:'Kanit',sans-serif;font-weight:700;font-size:44px;color:var(--ink-soft);
}
.viewer-hint{text-align:center;font-size:13px;color:var(--ink-soft);margin-top:10px}

@media (prefers-reduced-motion:reduce){
  *{animation:none !important;transition:none !important}
  html{scroll-behavior:auto}
}