:root{
  --bg:#0f172a; --panel:#ffffff; --ink:#0f172a; --muted:#64748b;
  --line:#e2e8f0; --brand:#1e40af; --brand2:#2563eb; --accent:#0ea5e9;
  --ok:#16a34a; --err:#dc2626; --soft:#f1f5f9; --radius:14px;
}
*{box-sizing:border-box}
body{
  margin:0;color:var(--ink);background:#f5f7fb;
  font-family:"Segoe UI",Tahoma,"Sarabun","Noto Sans Thai",system-ui,sans-serif;
  line-height:1.55;
}
.wrap{max-width:880px;margin:0 auto;padding:0 18px}

/* header */
.site-header{
  background:#fff;color:var(--ink);
  border-bottom:1px solid var(--line);box-shadow:0 2px 10px rgba(15,23,42,.06)
}
.header-inner{display:flex;align-items:center;justify-content:flex-start;gap:18px;flex-wrap:wrap;min-height:78px;padding:10px 0}
.brand-logo{height:96px;width:auto;flex:0 0 auto}
@media(max-width:680px){
  .header-inner{min-height:0}
  .brand-logo{height:66px}
}
.brand{display:flex;align-items:center;gap:14px}
.brand-badge{
  width:46px;height:46px;border-radius:12px;background:rgba(255,255,255,.16);
  display:grid;place-items:center;font-weight:800;font-size:18px;letter-spacing:1px;
  border:1px solid rgba(255,255,255,.35)
}
.brand-title{font-weight:700;font-size:1.15rem;color:var(--brand)}
.brand-sub{font-size:.82rem;color:var(--muted)}

/* cards / form */
main.wrap{padding-top:26px;padding-bottom:48px}
.card{
  background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);
  padding:26px;box-shadow:0 6px 24px rgba(15,23,42,.06)
}
.intro h1{margin:.1em 0 .15em;font-size:1.4rem;line-height:1.35}
.intro .lead{margin:0;color:var(--brand);font-weight:600}
.intro{border-bottom:1px solid var(--line);padding-bottom:16px;margin-bottom:8px}

/* about / project rationale card */
.about{margin-bottom:22px}
.about .intro{border-bottom:1px dashed var(--line)}
.lead-en{margin:.15em 0 0;color:var(--brand);font-weight:600;letter-spacing:.3px}
.by{margin:.5em 0 0;color:var(--muted);font-size:.9rem}
.prose h2{font-size:1.12rem;color:var(--brand);border-left:4px solid var(--brand);
  padding-left:11px;margin:1.5em 0 .6em}
.prose h3{font-size:1rem;margin:1.2em 0 .4em;color:#1f2937}
.prose p{margin:.55em 0;color:#334155;font-size:.95rem;text-align:justify;text-justify:inter-word}
.prose ol,.prose ul{margin:.4em 0;padding-left:1.45em;color:#334155;font-size:.95rem}
.prose li{margin:.4em 0;padding-left:.2em}
.flow{margin:1em 0 .4em;text-align:center}
.flow img{max-width:100%;height:auto;border:1px solid var(--line);border-radius:10px;
  box-shadow:0 4px 16px rgba(15,23,42,.08)}
.flow figcaption{margin-top:8px;color:var(--muted);font-size:.85rem;text-align:center;line-height:1.5}

/* CSS-only tabs (radio :checked) */
.tabs{margin-top:8px}
.tabs > input{position:absolute;opacity:0;width:0;height:0;pointer-events:none}
.tab-nav{display:flex;flex-wrap:wrap;gap:6px;border-bottom:2px solid var(--line);margin-bottom:18px}
.tab-nav label{
  display:inline-flex;align-items:center;gap:8px;cursor:pointer;user-select:none;
  padding:11px 16px;border:1px solid var(--line);border-bottom:none;border-radius:10px 10px 0 0;
  background:var(--soft);color:var(--muted);font-weight:600;font-size:.92rem;margin-bottom:-2px;
  transition:color .15s,background .15s,border-color .15s
}
.tab-nav label:hover{color:var(--brand);background:#e9eefb}
.tnum{width:22px;height:22px;border-radius:50%;background:#cbd5e1;color:#fff;display:grid;
  place-items:center;font-size:.8rem;font-weight:700;flex:0 0 auto;transition:background .15s}
.tab-panel{display:none;animation:tabfade .2s ease}
@keyframes tabfade{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}

#tab1:checked ~ .tab-panels .panel1,
#tab2:checked ~ .tab-panels .panel2,
#tab3:checked ~ .tab-panels .panel3,
#tab4:checked ~ .tab-panels .panel4{display:block}

#tab1:checked ~ .tab-nav label[for="tab1"],
#tab2:checked ~ .tab-nav label[for="tab2"],
#tab3:checked ~ .tab-nav label[for="tab3"],
#tab4:checked ~ .tab-nav label[for="tab4"]{
  background:#fff;color:var(--brand);border-color:var(--brand);border-bottom-color:#fff}
#tab1:checked ~ .tab-nav label[for="tab1"] .tnum,
#tab2:checked ~ .tab-nav label[for="tab2"] .tnum,
#tab3:checked ~ .tab-nav label[for="tab3"] .tnum,
#tab4:checked ~ .tab-nav label[for="tab4"] .tnum{background:var(--brand)}
.tab-panel .prose:first-child h3,.tab-panel > h3:first-child{margin-top:.2em}

@media(max-width:560px){
  .tab-nav{gap:4px;border-bottom:none}
  .tab-nav label{flex:1 1 auto;justify-content:center;padding:9px 10px;font-size:.84rem;border-radius:9px}
}

.sec{padding:18px 0;border-bottom:1px dashed var(--line)}
.sec:last-of-type{border-bottom:none}
.sec h2{display:flex;align-items:center;gap:10px;font-size:1.08rem;margin:.2em 0 1em}
.num{
  width:26px;height:26px;border-radius:50%;background:var(--brand);color:#fff;
  display:grid;place-items:center;font-size:.85rem;font-weight:700;flex:0 0 auto
}
.field{margin:0 0 14px}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:0 18px}
@media(max-width:620px){.grid2{grid-template-columns:1fr}}
label{display:block;font-weight:600;font-size:.92rem;margin-bottom:6px;color:#1f2937}
label.req::after{content:" *";color:var(--err)}
.hint{color:var(--muted);font-weight:400;font-size:.85rem}
input[type=text],input[type=email],input[type=url],input[type=tel],select,textarea{
  width:100%;padding:10px 12px;border:1px solid #cbd5e1;border-radius:9px;
  font:inherit;color:var(--ink);background:#fff;transition:border .15s,box-shadow .15s
}
input:focus,select:focus,textarea:focus{
  outline:none;border-color:var(--brand2);box-shadow:0 0 0 3px rgba(37,99,235,.15)
}
textarea{resize:vertical}
.mt6{margin-top:8px}.mt16{margin-top:16px}

.checks,.radios{display:flex;flex-wrap:wrap;gap:8px 18px}
.chk,.rdo{display:inline-flex;align-items:center;gap:7px;font-weight:500;
  background:var(--soft);border:1px solid var(--line);padding:7px 12px;border-radius:9px;cursor:pointer}
.chk input,.rdo input{accent-color:var(--brand2);width:16px;height:16px}

.consent{display:flex;gap:10px;align-items:flex-start;background:var(--soft);
  border:1px solid var(--line);border-radius:10px;padding:12px 14px;margin:10px 0;
  font-weight:500;font-size:.9rem;cursor:pointer}
.consent input{margin-top:3px;accent-color:var(--brand);width:17px;height:17px;flex:0 0 auto}

.actions{margin-top:22px;text-align:center}
.btn-primary{
  display:inline-block;background:var(--brand);color:#fff;border:none;
  padding:13px 30px;border-radius:10px;font:inherit;font-weight:700;font-size:1rem;
  cursor:pointer;text-decoration:none;transition:background .15s,transform .05s;
  box-shadow:0 4px 14px rgba(30,64,175,.3)
}
.btn-primary:hover{background:#1d3a9e}
.btn-primary:active{transform:translateY(1px)}

.alert{border-radius:10px;padding:12px 16px;margin:14px 0}
.alert-error{background:#fef2f2;border:1px solid #fecaca;color:#991b1b}
.alert ul{margin:.4em 0 0;padding-left:1.2em}

/* honeypot */
.hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}

/* success */
.success{text-align:center;padding:48px 26px}
.success .check{width:64px;height:64px;border-radius:50%;background:var(--ok);color:#fff;
  display:grid;place-items:center;font-size:34px;margin:0 auto 14px}
.success h1{margin:.2em 0}

/* admin */
.admin-head{display:flex;justify-content:space-between;align-items:center;gap:16px;
  flex-wrap:wrap;margin-bottom:14px}
.tablewrap{overflow-x:auto}
.admin-table{width:100%;border-collapse:collapse;font-size:.86rem}
.admin-table th,.admin-table td{border:1px solid var(--line);padding:8px 10px;text-align:left;vertical-align:top}
.admin-table thead th{background:var(--soft);position:sticky;top:0}
.admin-table tbody tr:nth-child(even){background:#fafcff}
.nowrap{white-space:nowrap}

/* top nav */
.top-nav{margin-left:auto;display:flex;gap:8px;flex-wrap:wrap}
.top-nav a{color:var(--brand);text-decoration:none;font-weight:600;font-size:.9rem;
  padding:8px 14px;border:1px solid var(--line);border-radius:8px;background:var(--soft);white-space:nowrap}
.top-nav a:hover{background:#e9eefb}

/* admin nav + misc */
.admin-nav{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.admin-nav a{color:var(--muted);text-decoration:none;font-weight:600;font-size:.9rem;
  padding:8px 14px;border:1px solid var(--line);border-radius:8px}
.admin-nav a.active{color:#fff;background:var(--brand);border-color:var(--brand)}
.admin-nav a.btn-primary{color:#fff}
.adminbar{padding:12px 16px;margin-bottom:18px}
.admin-user{margin-left:auto;color:var(--muted);font-size:.88rem;font-weight:600}

/* login */
.login-card{max-width:420px;margin:40px auto}
.login-card h1{margin-top:0;font-size:1.3rem;color:var(--brand)}

/* user management */
.row-actions{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.reset-pop{display:inline-block}
.reset-pop summary{list-style:none;cursor:pointer}
.reset-pop summary::-webkit-details-marker{display:none}
.reset-pop[open] summary{margin-bottom:6px}
.reset-pop input[type=password]{padding:6px 8px;border:1px solid #cbd5e1;border-radius:7px;font:inherit;font-size:.85rem;width:150px}

/* content image editor */
.img-edit{display:flex;gap:24px;flex-wrap:wrap}
.img-box{flex:1 1 240px}
.img-prev{max-height:120px;max-width:100%;border:1px solid var(--line);border-radius:8px;background:#f8fafc;padding:6px}
.img-prev.wide{max-height:150px}
.img-box input[type=file]{font-size:.85rem;max-width:100%}
.sec-title{font-size:1.1rem;margin:.2em 0 1em;color:var(--brand)}
.alert-ok{background:#ecfdf5;border:1px solid #a7f3d0;color:#065f46;border-radius:10px;padding:10px 14px;margin:0 0 14px}
.btn-sm{display:inline-block;padding:6px 12px;border-radius:8px;border:1px solid var(--line);
  background:var(--soft);color:var(--brand);font:inherit;font-size:.85rem;font-weight:600;cursor:pointer;text-decoration:none}
.btn-sm:hover{background:#e9eefb}
.btn-sm.danger{color:var(--err);border-color:#fecaca;background:#fef2f2}
.inline{display:inline-flex;gap:6px;align-items:center;margin:0}
.inline select{padding:6px 8px;border:1px solid #cbd5e1;border-radius:7px;font:inherit;font-size:.85rem}
.card + .card{margin-top:20px}

/* status badges */
.badge{display:inline-block;padding:3px 10px;border-radius:999px;font-size:.8rem;font-weight:600}
.badge.st-booked{background:#fef9c3;color:#854d0e}
.badge.st-confirmed{background:#dbeafe;color:#1e40af}
.badge.st-done{background:#dcfce7;color:#166534}
.badge.st-cancelled{background:#fee2e2;color:#991b1b}
.st-row-cancelled{opacity:.55;text-decoration:line-through}
tr.past{opacity:.5}

/* booking slot picker */
.slotlist{display:flex;flex-direction:column;gap:6px}
.slot-date{font-weight:700;color:var(--brand);margin:12px 0 4px}
.slot{display:flex;align-items:center;gap:12px;flex-wrap:wrap;border:1px solid var(--line);
  border-radius:9px;padding:10px 14px;cursor:pointer;background:#fff;transition:border .15s,background .15s}
.slot:hover{border-color:var(--brand2);background:#f8faff}
.slot.sel,.slot:has(input:checked){border-color:var(--brand);background:#eef3fe;box-shadow:0 0 0 2px rgba(37,99,235,.15)}
.slot input{accent-color:var(--brand);width:17px;height:17px}
.slot-time{font-weight:700;color:var(--ink)}
.slot-mode{font-size:.85rem;color:var(--muted);background:var(--soft);padding:2px 8px;border-radius:6px}
.slot-avail{font-size:.82rem;color:var(--ok);font-weight:600}
.slot-note{font-size:.82rem;color:var(--muted)}

/* slot add form */
.grid-slot{display:grid;grid-template-columns:repeat(5,1fr);gap:0 14px}
@media(max-width:680px){.grid-slot{grid-template-columns:1fr 1fr}}
.slot-form .field{margin-bottom:10px}

/* calendar */
.calendar{width:100%;border-collapse:collapse;table-layout:fixed;min-width:680px}
.calendar th{background:var(--soft);border:1px solid var(--line);padding:7px;font-size:.85rem;color:var(--muted)}
.calendar td{border:1px solid var(--line);vertical-align:top;height:92px;padding:4px;width:14.28%}
.calendar td.out{background:#fafafa;color:#cbd5e1}
.calendar td.today{background:#eff6ff;outline:2px solid var(--brand2);outline-offset:-2px}
.cal-day{font-weight:700;font-size:.82rem;color:var(--muted);text-align:right;margin-bottom:2px}
.cal-ev{font-size:.72rem;padding:2px 5px;border-radius:5px;margin-bottom:2px;overflow:hidden;
  text-overflow:ellipsis;white-space:nowrap;background:#dbeafe;color:#1e3a8a}
.cal-ev.st-confirmed{background:#bbf7d0;color:#14532d}
.cal-ev.st-done{background:#e2e8f0;color:#334155}
.cal-ev.st-booked{background:#fef08a;color:#713f12}
.cal-open{font-size:.68rem;color:var(--ok);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.cal-head{display:flex;align-items:center;justify-content:center;gap:16px;margin:6px 0 12px;font-size:1.05rem}

/* admin registered-orgs roster */
.reg-list{margin:.2em 0;padding-left:1.5em;columns:2;column-gap:32px}
.reg-list li{margin:7px 0;break-inside:avoid}
@media(max-width:640px){.reg-list{columns:1}}

/* dashboard (stats tab) */
.dash{padding-top:6px}
.stat-cards{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:6px 0 18px}
@media(max-width:640px){.stat-cards{grid-template-columns:1fr 1fr}}
.stat-card{background:linear-gradient(135deg,#eff4ff,#f8fafc);border:1px solid var(--line);
  border-radius:12px;padding:16px 14px;text-align:center}
.stat-num{font-size:1.8rem;font-weight:800;color:var(--brand);line-height:1.1}
.stat-cap{font-size:.82rem;color:var(--muted);margin-top:4px}
.dash-empty{text-align:center;color:var(--muted);padding:24px 0}
.dash-note{margin-top:14px}
.dash-block{margin:18px 0}
.dash-block h4,.chart h4{font-size:.98rem;color:var(--brand);margin:0 0 10px}
.dash-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px 26px;margin-top:10px}
@media(max-width:640px){.dash-grid{grid-template-columns:1fr}}

/* horizontal bar chart */
.chart{padding:4px 0}
.bar-row{display:flex;align-items:center;gap:10px;margin:6px 0;font-size:.86rem}
.bar-label{flex:0 0 38%;color:#334155;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.bar-track{flex:1 1 auto;height:14px;background:var(--soft);border-radius:7px;overflow:hidden}
.bar-fill{display:block;height:100%;border-radius:7px;min-width:2px;
  background:linear-gradient(90deg,var(--brand),var(--accent))}
.bar-val{flex:0 0 auto;color:var(--muted);font-size:.78rem;white-space:nowrap;min-width:66px;text-align:right}

/* daily registrations bars */
.timeseries{display:flex;align-items:flex-end;gap:6px;overflow-x:auto;padding-bottom:4px;min-height:130px}
.ts-col{display:flex;flex-direction:column;align-items:center;gap:3px;min-width:34px;flex:0 0 auto}
.ts-barwrap{display:flex;align-items:flex-end;height:90px;width:22px}
.ts-bar{width:22px;background:linear-gradient(180deg,var(--brand2),var(--accent));border-radius:5px 5px 0 0;min-height:4px}
.ts-cnt{font-size:.72rem;font-weight:700;color:var(--brand)}
.ts-date{font-size:.68rem;color:var(--muted);white-space:nowrap}

/* footer */
.site-footer{border-top:1px solid var(--line);background:#fff;color:var(--muted);
  font-size:.82rem;padding:18px 0;text-align:center}
.site-footer p{margin:0}
.site-footer .foot-sub{margin-top:4px;opacity:.85;font-size:.78rem}