:root{--green:#006747;--dark:#064b39;--gold:#c8a75b;--gold-dark:#aa7d22;--ink:#18241f;--muted:#6c7973;--line:#dde6e2;--soft:#f5f8f6;--cream:#fbfaf5;--white:#fff;--danger:#9c2b2b}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:Arial,Helvetica,sans-serif;color:var(--ink);background:#fff;line-height:1.55}
a{color:inherit}
img{display:block;max-width:100%}
button,input,select,textarea{font:inherit}
h1,h2,h3{font-family:Georgia,serif;font-weight:500}
h1{font-size:54px;line-height:1.05;margin:10px 0 15px}
h2{font-size:38px;margin:0 0 12px;line-height:1.1}
h3{font-size:24px;margin:0 0 8px}
p{margin:0 0 14px}
.kicker{text-transform:uppercase;letter-spacing:.16em;font-size:12px;font-weight:800;color:var(--green)}
.small{font-size:13px;color:var(--muted)}
.muted{color:var(--muted)}

/* Sidebar */
.sidebar{position:fixed;left:0;top:0;bottom:0;width:260px;background:var(--dark);color:#fff;padding:28px 22px;z-index:20;overflow:auto}
.brand{display:flex;gap:13px;align-items:center;text-decoration:none;padding-bottom:23px;border-bottom:1px solid rgba(255,255,255,.16)}
.brand img{width:54px;background:#fff;border-radius:50%;padding:3px}
.brand strong{display:block;font-size:16px;line-height:1.2}
.brand span{font-size:12px;color:#cce0d8}
.nav{margin-top:24px;display:grid;gap:6px}
.nav a{text-decoration:none;padding:11px 12px;border-radius:8px;color:#e9f3ef;font-weight:700;font-size:14px}
.nav a:hover{background:rgba(255,255,255,.10)}
.nav a.active{background:rgba(255,255,255,.16);color:#fff}
.social{margin-top:28px;padding-top:20px;border-top:1px solid rgba(255,255,255,.16);font-size:13px;color:#cfe0d8}
.social a{display:block;margin:9px 0;color:#fff}
.mobilebar{display:none}

/* Layout */
.main{margin-left:260px;min-height:100vh}
.section{padding:64px 6vw}
.section.tight{padding-top:40px;padding-bottom:40px}
.soft{background:var(--soft)}
.cream{background:var(--cream)}
.two{display:grid;grid-template-columns:1.1fr .9fr;gap:42px;align-items:start}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:22px;box-shadow:0 6px 22px rgba(12,50,37,.05)}
.quote{border-left:4px solid var(--gold);padding:16px 19px;background:var(--cream);border-radius:0 12px 12px 0}
.quote p{margin:0;font-size:18px}
.btns{display:flex;gap:11px;flex-wrap:wrap;margin-top:22px}
.btn{display:inline-block;padding:12px 17px;border-radius:9px;text-decoration:none;font-weight:800;font-size:14px;border:1px solid transparent;cursor:pointer;background:#fff;color:var(--dark);line-height:1.2}
.btn.primary{background:var(--green);color:#fff}
.btn.primary:hover{background:var(--dark)}
.btn.light{background:#fff;color:var(--dark)}
.btn.outline{border-color:var(--green);color:var(--green);background:#fff}
.btn.outline:hover{background:var(--soft)}
.btn.sm{padding:8px 12px;font-size:13px}
.btn{white-space:nowrap}
.btn[disabled]{opacity:.6;cursor:default}
.note{padding:12px 14px;background:#fff8e8;border:1px solid #ead7a4;border-radius:10px;font-size:13px}
.error{color:var(--danger);font-size:13px;font-weight:700;margin-top:10px;min-height:1em}
.ok{color:var(--green);font-weight:700}

/* Hero */
.hero{min-height:640px;display:flex;align-items:end;background:linear-gradient(180deg,rgba(5,31,22,0) 0%,rgba(5,31,22,.10) 35%,rgba(5,31,22,.55) 62%,rgba(5,31,22,.92) 100%),url('/assets/hku-main-building.jpg') center 62%/cover no-repeat,#06382b;color:#fff}
.cities{display:grid;grid-template-columns:1fr 1fr;min-height:260px}
.cities .city{position:relative;display:flex;align-items:end;padding:22px 6vw;color:#fff;background-size:cover;background-position:center;min-height:260px}
.cities .city::before{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(5,31,22,0) 45%,rgba(5,31,22,.78))}
.cities .city > div{position:relative}
.cities .city .kicker{color:#e0c984;text-shadow:0 1px 6px rgba(0,0,0,.6)}
.cities .city h3{margin:2px 0 0;font-size:26px;text-shadow:0 1px 6px rgba(0,0,0,.5)}
.cities .hk{background-image:url('/assets/hk-skyline.jpg')}
.cities .ny{background-image:url('/assets/ny-skyline.jpg')}
.backdrop{position:relative;color:#fff;background-size:cover;background-position:center}
.backdrop::before{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(5,31,22,.90),rgba(5,31,22,.72))}
.backdrop > *{position:relative}
.backdrop .kicker{color:#e0c984}.backdrop p{color:#e9f3ef}.backdrop h1,.backdrop h2{color:#fff}
.backdrop.ny{background-image:url('/assets/ny-skyline.jpg')}
.backdrop.hk{background-image:url('/assets/hk-skyline.jpg');border-bottom:0}
.backdrop .card{color:var(--ink)}.backdrop .card p{color:var(--muted)}.backdrop .card h3{color:var(--ink)}
.footer .credits{margin-top:10px;font-size:11px;color:#9fb8ae}
.footer .credits a{color:#c9dcd4}
.hero .inner{max-width:900px;padding:220px 6vw 44px;text-shadow:0 1px 8px rgba(0,0,0,.45)}
.hero .kicker{color:#e0c984}
.hero p{font-size:20px;max-width:720px;color:#f5f7f6}
.page-head{padding:56px 6vw 28px;background:var(--cream);border-bottom:1px solid var(--line)}
.page-head p{max-width:760px;color:var(--muted);margin:0}

/* Event cards */
.event-card{border:1px solid var(--line);border-radius:15px;overflow:hidden;background:#fff;text-decoration:none;display:flex;flex-direction:column;transition:transform .15s,box-shadow .15s}
.event-card:hover{transform:translateY(-2px);box-shadow:0 10px 26px rgba(12,50,37,.10)}
.event-card .thumb{width:100%;height:190px;object-fit:cover;background:var(--soft)}
.event-card .thumb.placeholder{display:grid;place-items:center;font-size:48px;color:var(--green);background:linear-gradient(135deg,#eef5f1,#dbe9e2)}
.event-card .body{padding:17px}
.event-card .year{font-size:12px;font-weight:800;letter-spacing:.12em;color:var(--green);text-transform:uppercase}
.event-card h3{font-size:21px;margin:6px 0 4px}
.event-card p{color:var(--muted);font-size:14px;margin:6px 0 0}
.badge{display:inline-block;font-size:11px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;padding:4px 9px;border-radius:999px;background:var(--gold);color:#2a2410;margin-left:8px;vertical-align:middle}
.badge.open{background:var(--green);color:#fff}
.timeline{display:grid;gap:9px;margin-top:20px}
.timeline .row{display:grid;grid-template-columns:75px 1fr auto;gap:12px;align-items:center;padding:12px 14px;border:1px solid var(--line);border-radius:10px;background:#fff;text-decoration:none}
.timeline .row:hover{background:var(--soft)}
.timeline .yr{font-weight:800;color:var(--green)}
.timeline .go{font-size:12px;font-weight:700;color:var(--green)}

.sidebar .admin-link{display:inline-block;margin-top:22px;padding:7px 12px;border-radius:999px;background:var(--gold);color:#2a2410;font-size:12px;font-weight:800;letter-spacing:.06em;text-decoration:none}
.sidebar .admin-link:hover{background:#e0c27a}

.card.role{cursor:pointer;transition:transform .15s,box-shadow .15s;border-top:4px solid var(--gold)}
.card.role:hover{transform:translateY(-2px);box-shadow:0 10px 28px rgba(12,50,37,.10)}
.card.role h3{margin:6px 0 8px}

/* Events archive: continuous, grouped by year */
.yearnav{display:flex;flex-wrap:wrap;gap:6px;margin-top:18px}
.yearnav a{font-size:12px;font-weight:800;letter-spacing:.06em;padding:5px 10px;border-radius:999px;background:rgba(255,255,255,.16);color:#fff;text-decoration:none;border:1px solid rgba(255,255,255,.35)}
.yearnav a:hover{background:var(--gold);color:#2a2410;border-color:var(--gold)}
.yearblock{margin-top:34px;scroll-margin-top:20px}
.yearhead{display:flex;align-items:center;gap:16px;margin-bottom:14px}
.yearhead span{font-family:Georgia,"Times New Roman",serif;font-size:42px;font-weight:700;color:var(--green);line-height:1}
.yearhead i{flex:1;height:2px;background:linear-gradient(90deg,var(--gold),transparent)}
.yearnote{background:#fff;border:1px dashed var(--gold);border-radius:12px;padding:16px 18px;color:var(--muted);font-size:15px;margin-bottom:14px}
.ev{background:#fff;border:1px solid var(--line);border-radius:16px;padding:20px 22px;margin-bottom:16px;box-shadow:0 6px 22px rgba(12,50,37,.05)}
.ev-head{display:flex;justify-content:space-between;align-items:flex-start;gap:14px}
.ev h3{margin:0 0 4px;font-size:21px}
.ev h3 a{color:var(--dark);text-decoration:none}
.ev h3 a:hover{color:var(--green)}
.ev p{color:var(--ink);font-size:15px;margin:10px 0 0;max-width:820px}
.btn.sm{padding:8px 12px;font-size:12px}
.strip{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:8px;margin-top:14px}
.strip a{position:relative;display:block;border-radius:10px;overflow:hidden;background:var(--soft);border:1px solid var(--line);aspect-ratio:4/3}
.strip img{width:100%;height:100%;object-fit:cover;transition:transform .2s}
.strip a:hover img{transform:scale(1.04)}
.strip a.inv{border-color:var(--gold)}
.strip a.inv span,.strip a.vid span,.gallery a.inv span{position:absolute;left:6px;top:6px;font-size:10px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;background:var(--gold);color:#2a2410;padding:2px 7px;border-radius:999px}
.strip a.vid span{background:var(--green);color:#fff}
.strip a.vid i,.gallery a.vid i{position:absolute;inset:0;display:grid;place-items:center;font-style:normal;color:#fff;font-size:34px;text-shadow:0 2px 10px rgba(0,0,0,.6);background:rgba(0,0,0,.18)}
.gallery a{position:relative}
.gallery a.inv{border-color:var(--gold)}
.video{margin-top:14px;max-width:760px}
.video iframe{width:100%;aspect-ratio:16/10;border:0;border-radius:12px;background:#000}

/* Event detail */
.backlink{display:inline-block;margin-bottom:14px;font-weight:800;font-size:14px;color:var(--green);text-decoration:none;padding:7px 12px;border:1px solid var(--green);border-radius:999px;background:#fff}
.backlink:hover{background:var(--green);color:#fff}
.event-hero{padding:48px 6vw 30px;background:var(--cream);border-bottom:1px solid var(--line)}
.event-hero h1{font-size:46px;margin:6px 0 6px}
.tagline{color:var(--gold-dark);font-size:18px;font-weight:700;margin-bottom:12px}
.info-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;max-width:820px;margin:18px 0 0}
.info{background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px;font-size:14px;line-height:1.5}
.info small{display:block;color:var(--muted);letter-spacing:.11em;font-weight:700;margin-bottom:3px;font-size:11px;text-transform:uppercase}
.features{margin:16px 0 0;display:flex;flex-wrap:wrap;gap:8px 18px;color:var(--muted);font-size:14px}
.gallery{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:12px;margin-top:18px}
.gallery a{display:block;border-radius:12px;overflow:hidden;border:1px solid var(--line);background:var(--soft)}
.gallery img{width:100%;height:190px;object-fit:cover;transition:transform .2s}
.gallery a:hover img{transform:scale(1.03)}
.lightbox{position:fixed;inset:0;background:rgba(0,0,0,.88);display:none;align-items:center;justify-content:center;z-index:50;padding:24px}
.lightbox.show{display:flex}
.lightbox img{max-width:100%;max-height:90vh;border-radius:8px}
.lightbox .cap{position:absolute;bottom:18px;left:0;right:0;text-align:center;color:#fff;font-size:14px}
.lightbox .x{position:absolute;top:14px;right:18px;color:#fff;font-size:30px;background:none;border:0;cursor:pointer}
.attendee-chip{background:#f3f8f5;border:1px solid #cfe0d8;color:var(--dark);border-radius:999px;padding:8px 11px;font-size:13px;font-weight:700;display:inline-block;margin:0 6px 8px 0}
.desc p{font-size:16px;max-width:760px}

/* Forms */
.formgrid{display:grid;grid-template-columns:1fr 1fr;gap:15px}
.phonewrap{display:grid;grid-template-columns:120px 1fr;gap:8px}
.phonewrap select{padding-left:6px;padding-right:2px;font-size:14px}
label{display:block;font-size:12px;font-weight:800;margin-bottom:6px}
input,select,textarea{width:100%;padding:11px 12px;border:1px solid #cfdad5;border-radius:8px;background:#fff;color:var(--ink);font-size:15px}
input:focus,select:focus,textarea:focus,button:focus{outline:3px solid rgba(0,103,71,.22);outline-offset:1px}
.full{grid-column:1/-1}
.choice{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:20px}
.choice button{border:1px solid var(--line);background:#fff;padding:11px 14px;border-radius:9px;font-weight:800;cursor:pointer}
.choice button.active{background:var(--green);color:#fff;border-color:var(--green)}
.checks{display:flex;flex-wrap:wrap;gap:8px 16px}
.checks label{display:flex;align-items:center;gap:7px;font-weight:600;font-size:14px;margin:0}
.checks input{width:auto}
.guest-row{display:grid;grid-template-columns:1fr 1fr;gap:12px;background:#f8faf9;padding:13px;border-radius:10px;margin-top:11px}
.progress{display:grid;grid-template-columns:repeat(3,1fr);text-align:center;gap:6px;max-width:520px;margin:0 0 18px}
.step{color:var(--muted);font-size:13px}
.step .circle{width:30px;height:30px;margin:0 auto 6px;border:1px solid var(--line);border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:800}
.step.active{color:var(--green);font-weight:700}
.step.active .circle{background:var(--green);color:#fff;border-color:var(--green)}
.capacity{margin:0 0 16px;padding:12px 16px;border-radius:12px;background:#fff7df;border:1px solid #e4c768;color:#6f5610;font-weight:700;font-size:14px}
.capacity.full{background:#fff3f0;border-color:#e2a89c;color:#7b2f23}
.amount-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin:12px 0}
.amount-btn{border:1px solid #b9cfc4;background:#fff;color:var(--dark);padding:12px 8px;border-radius:10px;font-weight:800;cursor:pointer}
.amount-btn.active{background:var(--green);color:#fff;border-color:var(--green)}
.pay{border:1px solid var(--line);border-radius:14px;padding:22px;background:#fff}
.pay strong{font-size:22px;color:var(--green)}
.confirm{text-align:center;padding:24px 10px}
.confirm .check{width:64px;height:64px;border-radius:50%;background:var(--green);color:#fff;display:flex;align-items:center;justify-content:center;font-size:32px;margin:auto}

.footer{padding:32px 6vw;background:#102c23;color:#d8e7e1;font-size:13px}
.footer b{color:#fff}
.footer a{color:#fff}

@media(max-width:900px){
  .strip{grid-template-columns:repeat(auto-fill,minmax(110px,1fr))}
  .ev-head{flex-direction:column}
  .sidebar{transform:translateX(-100%);transition:transform .2s}
  .sidebar.open{transform:none}
  .main{margin-left:0}
  .mobilebar{display:flex;position:sticky;top:0;z-index:30;background:var(--dark);color:#fff;padding:12px 16px;align-items:center;justify-content:space-between}
  .mobilebar img{width:36px;background:#fff;border-radius:50%}
  .mobilebar button{background:none;border:0;color:#fff;font-size:26px;cursor:pointer}
  h1{font-size:40px}h2{font-size:30px}
  .hero{min-height:440px}
  .two,.grid3,.grid2,.formgrid,.info-grid,.guest-row,.cities{grid-template-columns:1fr}
  .cities .city{min-height:190px}
  .full{grid-column:auto}
  .timeline .row{grid-template-columns:60px 1fr}
  .timeline .row .go{grid-column:2}
  .event-hero h1{font-size:34px}
  .section{padding:44px 5vw}
}

/* Language switch and Traditional Chinese typography */
.langswitch{display:flex;gap:6px;margin-top:22px}
.langswitch button{flex:1;border:1px solid rgba(255,255,255,.28);background:transparent;color:#cfe0d8;font:700 12px Arial,Helvetica,sans-serif;padding:6px 8px;border-radius:999px;cursor:pointer}
.langswitch button.on{background:#fff;color:var(--green);border-color:#fff}
.langswitch button:hover:not(.on){border-color:#fff;color:#fff}
.mobilebar .langbtn{border:1px solid rgba(255,255,255,.4);background:transparent;color:#fff;font:700 13px Arial,Helvetica,sans-serif;padding:4px 10px;border-radius:999px;cursor:pointer}
html.zh body{font-family:-apple-system,"PingFang TC","Microsoft JhengHei","Noto Sans TC","Heiti TC",Arial,sans-serif;line-height:1.7}
html.zh h1,html.zh h2,html.zh h3,html.zh .yearhead span{font-family:"Noto Serif TC","Songti TC","PMingLiU","PingFang TC","Microsoft JhengHei",Georgia,serif;font-weight:600}
html.zh .kicker{letter-spacing:.2em}

/* external links under Stay connected: secondary to our own */
.social .ext{margin-top:12px;padding-top:10px;border-top:1px dashed rgba(255,255,255,.14)}
.social .ext a{font-size:12px;color:#a9c4b8;margin:6px 0}
.social .ext a:hover{color:#fff}