:root{
  --navy:#1d3a8a; --navy-d:#142a66; --red:#d62839; --red-d:#b11f2e;
  --bg:#f4f6fb; --card:#fff; --ink:#18213a; --mute:#5b6580; --line:#dfe4f0; --ok:#12805c; --warn:#b7791f;
  --soft:#eaf0ff; --radius:14px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font:16px/1.55 "Be Vietnam Pro",system-ui,Segoe UI,Roboto,sans-serif;color:var(--ink);background:var(--bg);-webkit-text-size-adjust:100%}
a{color:var(--navy)}
img{max-width:100%}
.wrap{max-width:1100px;margin:0 auto;padding:0 16px}
[hidden]{display:none!important}

.demo-bar{background:#fff3cd;color:#664d03;font-size:13px;text-align:center;padding:6px 12px}
.top{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
.top::after{content:"";display:block;height:4px;background:linear-gradient(90deg,var(--navy) 0 55%,var(--red) 55% 100%)}
.top-in{display:flex;align-items:center;justify-content:space-between;gap:12px;padding-top:8px;padding-bottom:8px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--navy)}
.brand b{display:block;font-size:17px;line-height:1.2}
.brand small{color:var(--mute);font-size:12px}
.nav{display:flex;gap:4px;overflow-x:auto;padding-bottom:6px;scrollbar-width:none}
.nav::-webkit-scrollbar{display:none}
.nav a{white-space:nowrap;text-decoration:none;color:var(--mute);font-weight:600;font-size:14px;padding:7px 12px;border-radius:999px}
.nav a:hover{background:var(--soft);color:var(--navy)}
.nav a.on{background:var(--navy);color:#fff}

main{padding-top:20px;padding-bottom:40px;min-height:60vh}
h1{font-size:clamp(26px,5vw,40px);line-height:1.15;margin:0 0 8px;color:var(--navy);letter-spacing:-.01em}
h2{font-size:22px;margin:28px 0 12px;color:var(--navy)}
h3{font-size:17px;margin:16px 0 8px}
.lead{color:var(--mute);margin:0 0 16px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px;margin-bottom:16px}
.card.flat{padding:0;overflow:hidden}
.grid{display:grid;gap:16px}
.g2{grid-template-columns:repeat(auto-fit,minmax(300px,1fr))}
.g3{grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}
.g4{grid-template-columns:repeat(auto-fit,minmax(150px,1fr))}
.muted{color:var(--mute)}
.small{font-size:13px}
.right{text-align:right}
.center{text-align:center}
.nowrap{white-space:nowrap}

/* hero */
.hero{background:linear-gradient(135deg,var(--navy) 0,var(--navy-d) 100%);color:#fff;border-radius:20px;padding:28px 22px;position:relative;overflow:hidden}
.hero::after{content:"";position:absolute;right:-60px;top:-60px;width:260px;height:260px;border-radius:50%;background:rgba(255,255,255,.07)}
.hero h1{color:#fff;font-size:clamp(28px,6vw,46px)}
.hero h1 em{font-style:normal;color:#ff9aa4}
.hero p{margin:6px 0;opacity:.92}
.badge{display:inline-block;background:var(--red);color:#fff;font-weight:700;font-size:12px;letter-spacing:.04em;text-transform:uppercase;padding:4px 10px;border-radius:999px}
.hero .actions{margin-top:18px;display:flex;flex-wrap:wrap;gap:10px}
.count{display:flex;gap:10px;margin-top:18px}
.count div{background:rgba(255,255,255,.12);border-radius:10px;padding:8px 12px;min-width:64px;text-align:center}
.count b{display:block;font-size:24px;line-height:1.1}
.count span{font-size:11px;opacity:.85;text-transform:uppercase}

.phases{display:flex;gap:8px;margin:16px 0}
.phase{flex:1;text-align:center;padding:10px 6px;border-radius:12px;background:#fff;border:1px solid var(--line);font-weight:600;font-size:14px;color:var(--mute)}
.phase.on{background:var(--red);border-color:var(--red);color:#fff}
.phase small{display:block;font-weight:400;font-size:12px;opacity:.85}

.stat{background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px}
.stat b{display:block;font-size:26px;color:var(--navy);line-height:1.1}
.stat span{color:var(--mute);font-size:13px}
.bar{height:8px;border-radius:6px;background:var(--soft);overflow:hidden;margin-top:8px}
.bar i{display:block;height:100%;background:var(--navy)}

/* buttons / forms */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;font:inherit;font-weight:700;font-size:15px;border:0;border-radius:10px;padding:10px 18px;cursor:pointer;text-decoration:none;background:var(--red);color:#fff;min-height:44px}
.btn:hover{background:var(--red-d)}
.btn.navy{background:var(--navy)}.btn.navy:hover{background:var(--navy-d)}
.btn.ghost{background:transparent;color:var(--navy);box-shadow:inset 0 0 0 1.5px var(--navy)}
.btn.ghost:hover{background:var(--soft)}
.hero .btn.ghost{color:#fff;box-shadow:inset 0 0 0 1.5px rgba(255,255,255,.7)}
.btn.sm{padding:5px 10px;font-size:13px;min-height:32px;border-radius:8px}
.btn.zalo{background:#0068ff}.btn.zalo:hover{background:#0052cc}
.btn:disabled{opacity:.55;cursor:default}
label{display:block;font-weight:600;font-size:14px;margin:0 0 4px}
input,select,textarea{width:100%;font:inherit;padding:10px 12px;border:1px solid #c5cde0;border-radius:10px;background:#fff;color:var(--ink);min-height:44px}
input:focus,select:focus,textarea:focus,.btn:focus-visible,a:focus-visible{outline:3px solid #9db6ff;outline-offset:1px}
.field{margin-bottom:12px}
.row{display:grid;gap:12px;grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}
.seg{display:flex;gap:8px;flex-wrap:wrap}
.seg label{margin:0;flex:1;min-width:140px;border:1.5px solid var(--line);border-radius:12px;padding:10px 12px;cursor:pointer;background:#fff}
.seg input{width:auto;min-height:0;margin-right:6px}
.seg label:has(input:checked){border-color:var(--navy);background:var(--soft)}
fieldset{border:1px solid var(--line);border-radius:12px;padding:12px 14px;margin:0 0 14px}
legend{font-weight:700;color:var(--navy);padding:0 6px}
.err{background:#fde8ea;color:#8f1523;border-radius:10px;padding:10px 12px;margin:10px 0;font-size:14px}
.note{background:var(--soft);border-radius:10px;padding:10px 12px;font-size:14px}

/* tables */
.tbl-wrap{overflow-x:auto}
table{border-collapse:collapse;width:100%;font-size:14px}
th,td{padding:8px 10px;text-align:left;border-bottom:1px solid var(--line);vertical-align:middle}
th{background:#f0f3fa;font-size:12px;text-transform:uppercase;letter-spacing:.03em;color:var(--mute);white-space:nowrap}
tr:last-child td{border-bottom:0}
td.num,th.num{text-align:right;font-variant-numeric:tabular-nums}
tr.q td{background:#f1fbf6}
.pill{display:inline-block;border-radius:999px;font-size:12px;font-weight:700;padding:2px 10px;white-space:nowrap}
.pill.ok{background:#dcf5ea;color:var(--ok)}
.pill.wait{background:#fff0cf;color:var(--warn)}
.pill.no{background:#fde8ea;color:#8f1523}
.pill.info{background:var(--soft);color:var(--navy)}

/* payment */
.pay{display:grid;gap:18px;grid-template-columns:minmax(220px,300px) 1fr;align-items:start}
@media(max-width:640px){.pay{grid-template-columns:1fr}}
.qr{background:#fff;border:2px solid var(--navy);border-radius:16px;padding:10px;text-align:center}
.qr svg{width:100%;height:auto;display:block}
.kv{display:grid;grid-template-columns:130px 1fr;gap:6px 10px;font-size:15px}
.kv dt{color:var(--mute)} .kv dd{margin:0;font-weight:600;word-break:break-word}
.copy{cursor:pointer;border:0;background:var(--soft);color:var(--navy);border-radius:6px;font-size:12px;padding:2px 8px;margin-left:6px;font-weight:600}

/* tournament */
.tabs{display:flex;gap:6px;flex-wrap:wrap;margin:0 0 14px}
.tabs button{font:inherit;font-weight:600;font-size:14px;border:1px solid var(--line);background:#fff;color:var(--mute);border-radius:999px;padding:7px 14px;cursor:pointer;min-height:36px}
.tabs button.on{background:var(--navy);color:#fff;border-color:var(--navy)}
.match{display:grid;grid-template-columns:1fr auto 1fr;gap:8px;align-items:center;padding:10px 12px;border-bottom:1px solid var(--line)}
.match:last-child{border-bottom:0}
.match .t{font-weight:600}.match .t.w{color:var(--ok)}.match .t:last-child{text-align:right}
.match .sc{font-weight:800;font-size:18px;background:var(--soft);border-radius:8px;padding:2px 12px;min-width:76px;text-align:center;font-variant-numeric:tabular-nums}
.match .meta{grid-column:1/-1;font-size:12px;color:var(--mute);display:flex;gap:10px;flex-wrap:wrap}
.bracket{display:flex;gap:18px;overflow-x:auto;padding-bottom:8px}
.bcol{min-width:210px;display:flex;flex-direction:column;justify-content:space-around;gap:10px}
.bcol h4{margin:0 0 4px;font-size:12px;text-transform:uppercase;color:var(--mute);letter-spacing:.04em}
.bm{background:#fff;border:1px solid var(--line);border-radius:10px;font-size:13px;overflow:hidden}
.bm div{display:flex;justify-content:space-between;gap:8px;padding:6px 10px}
.bm div+div{border-top:1px solid var(--line)}
.bm .w{background:#f1fbf6;font-weight:700}
.podium{display:grid;gap:14px;grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}
.medal{border-radius:14px;padding:16px;text-align:center;color:#fff}
.medal.m1{background:linear-gradient(135deg,#d99a00,#f2c94c);color:#3b2b00}
.medal.m2{background:linear-gradient(135deg,#8a94a8,#c3cad8);color:#1f2633}
.medal.m3{background:linear-gradient(135deg,#a8642b,#d89562);color:#2b1700}
.medal b{display:block;font-size:19px;margin:6px 0 2px}
.medal span{font-size:13px}

/* finance */
.stack{display:flex;height:22px;border-radius:8px;overflow:hidden;background:var(--soft)}
.stack i{display:block;height:100%}
.legend{display:flex;gap:14px;flex-wrap:wrap;font-size:13px;margin-top:8px}
.legend i{display:inline-block;width:10px;height:10px;border-radius:3px;margin-right:5px}
.money{font-variant-numeric:tabular-nums;font-weight:700}

.foot{background:var(--navy-d);color:#d7dff5;text-align:center;padding:24px 0;font-size:14px}
.foot a{color:#fff}
.sponsor{display:flex;align-items:center;justify-content:center;gap:12px;background:#fff;color:var(--ink);border-radius:12px;padding:8px 16px;width:fit-content;margin:0 auto 12px;font-weight:600;font-size:13px}
.slogan{font-weight:700;letter-spacing:.06em;text-transform:uppercase;font-size:12px}
.toast{position:fixed;left:50%;bottom:20px;transform:translateX(-50%);background:var(--ink);color:#fff;padding:10px 18px;border-radius:10px;z-index:50;font-size:14px;max-width:92vw}
.empty{text-align:center;color:var(--mute);padding:28px 12px}
.admin-bar{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:12px}
.savestate{font-size:13px;color:var(--mute)}
.savestate.err2{color:var(--red)}
.inline-score{display:inline-flex;gap:4px;align-items:center}
.inline-score input{width:52px;min-height:34px;padding:4px 6px;text-align:center}
td input,td select{min-height:34px;padding:4px 8px;font-size:14px}
.sticky-actions{position:sticky;bottom:0;background:#fff;border-top:1px solid var(--line);padding:10px 0;display:flex;gap:8px;flex-wrap:wrap}
.prose p,.prose li{margin:0 0 8px}
.prose ul{padding-left:20px;margin:0 0 8px}
.prose h3{color:var(--red)}
@media(max-width:560px){
  .logo50{display:none}
  .match{grid-template-columns:1fr auto}
  .match .t:last-child{text-align:left;grid-column:1}
  .match .sc{grid-row:1/3;grid-column:2}
}
@media print{.top,.nav,.foot,.btn,.demo-bar,.no-print{display:none!important}body{background:#fff}.card{border:0}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

/* nhà tài trợ */
.main-sponsor{display:flex;align-items:center;justify-content:center;gap:clamp(12px,3vw,28px);flex-wrap:wrap;margin:16px 0;padding:18px 22px;background:#fff;border:2px solid var(--navy);border-radius:18px;text-decoration:none;box-shadow:0 6px 20px rgba(29,58,138,.12);transition:transform .15s}
.main-sponsor:hover{transform:translateY(-2px)}
.main-sponsor img{height:clamp(44px,9vw,78px);width:auto;max-width:100%}
.ms-label{font-weight:800;color:var(--red);text-transform:uppercase;letter-spacing:.06em;font-size:13px}
.ms-more{font-size:13px;color:var(--mute);font-weight:600}
.sp-hero{text-align:center;background:linear-gradient(180deg,#fff 0,var(--soft) 100%);border:2px solid var(--navy);border-radius:22px;padding:30px 18px;box-shadow:0 10px 30px rgba(29,58,138,.14)}
.sp-main{margin:18px auto 8px;max-width:860px}
.sp-main img{width:100%;height:auto;display:block}
.sp-name{font-weight:800;color:var(--navy);font-size:20px;margin:6px 0}
.sp-thanks{max-width:640px;margin:0 auto;color:var(--mute)}
.sp-grid{display:grid;gap:10px;grid-template-columns:repeat(auto-fill,minmax(130px,1fr))}
.sp-tile{background:#fff;border:1px solid var(--line);border-radius:12px;display:flex;align-items:center;justify-content:center;aspect-ratio:152/82;padding:6px;transition:transform .15s,box-shadow .15s}
.sp-tile:hover{transform:translateY(-2px);box-shadow:0 6px 16px rgba(24,33,58,.12)}
.sp-tile img{max-width:100%;max-height:100%;object-fit:contain}
.tier{border-radius:14px;padding:16px;border:2px solid var(--line);display:flex;flex-direction:column;gap:6px}
.tier small{font-weight:800;text-transform:uppercase;letter-spacing:.05em}
.tier b{font-size:26px;line-height:1.1}
.tier span{font-size:13px}
.t-kc{background:var(--navy);border-color:var(--navy);color:#fff}
.t-vang{background:#fff7dd;border-color:#e0b43a;color:#6b4e00}
.t-dong{background:#fcebe0;border-color:#c9783c;color:#6b3410}
.t-dtt{background:#eef3ff;border-color:#b5c6f0;color:var(--navy)}
.sponsor{display:flex;align-items:center;justify-content:center;gap:16px;flex-wrap:wrap;background:#fff;color:var(--ink);border-radius:14px;padding:12px 22px;width:fit-content;max-width:100%;margin:0 auto 14px;font-weight:700;font-size:13px;text-transform:uppercase;letter-spacing:.05em;text-decoration:none}
.sponsor img{height:clamp(36px,8vw,56px);width:auto}
.mini-logos{display:flex;flex-wrap:wrap;gap:6px;justify-content:center;margin:0 auto 16px;max-width:900px}
.mini-logos img{height:34px;width:auto;max-width:90px;object-fit:contain;background:#fff;border-radius:6px;padding:3px 5px}

/* header: logo nhà tài trợ chính nằm giữa logo trường và logo 50 năm */
.top-in{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:12px}
.top-in .logo50{justify-self:end}
.hd-sponsor{display:flex;flex-direction:column;align-items:center;gap:2px;text-decoration:none;padding:4px 10px;border-left:1px solid var(--line);border-right:1px solid var(--line)}
.hd-sponsor small{font-size:10px;font-weight:800;letter-spacing:.07em;text-transform:uppercase;color:var(--red);line-height:1}
.hd-sponsor img{height:34px;width:auto;display:block}
@media(max-width:700px){
  .top-in{grid-template-columns:auto 1fr;}
  .brand small{display:none}
  .hd-sponsor{justify-self:end;border:0;padding:0}
  .hd-sponsor img{height:26px}
  .logo50{display:none}
}
/* chân trang: căn logo vào giữa khung */
.sponsor{flex-direction:column;gap:8px;padding:14px 28px;text-align:center}
.sponsor span{display:block;line-height:1}
.sponsor img{display:block;margin:0 auto;height:clamp(44px,9vw,64px);width:auto}