/* Isolated classroom surface. The rest of Vocab.EE keeps its original styles. */
body.vb-open{overflow:hidden}
#vocab-battle{--vb-navy:#102c53;--vb-blue:#2465d6;--vb-gold:#ffd36b;--vb-text:#142b49;--vb-muted:#54667d;--vb-line:#dce3ed;color:var(--vb-text);background:#f3f6fb;width:100%;height:100dvh;max-width:none;max-height:none;margin:0;padding:0;border:0;overflow:auto;overscroll-behavior:contain;font-family:Inter,Arial,sans-serif}
#vocab-battle::backdrop{background:#102c5380}
#vocab-battle [hidden]{display:none!important}
#vocab-battle *{box-sizing:border-box}
#vocab-battle button,#vocab-battle input,#vocab-battle select{font-family:inherit;font-size:14px;letter-spacing:normal}
#vocab-battle button{min-height:44px;white-space:normal;display:inline-flex;justify-content:center;align-items:center;gap:8px;border:1px solid var(--vb-line);padding:11px 16px;border-radius:12px;background:#fff;color:var(--vb-navy);font-weight:650;line-height:1.35;cursor:pointer;transition:transform .16s,background .16s,box-shadow .16s}
#vocab-battle button:hover:not(:disabled){background:#e9eff9;transform:translateY(-1px)}
#vocab-battle button:disabled{cursor:default;opacity:.5;transform:none}
#vocab-battle button:focus-visible,#vocab-battle input:focus-visible,#vocab-battle select:focus-visible,#vocab-battle summary:focus-visible{outline:3px solid #236bdc;outline-offset:4px}
#vocab-battle button.vb-primary{background:var(--vb-navy);color:#fff;border-color:var(--vb-navy);padding:14px 22px}
#vocab-battle button.vb-primary:hover{background:#214778}
.vb-shell{width:min(1380px,100%);margin:auto;padding:26px 36px 36px}
.vb-top{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:28px}
.vb-brand{display:flex;align-items:center;gap:13px;min-width:0}
.vb-brand-mark{display:grid;place-items:center;background:var(--vb-gold);color:var(--vb-navy);width:46px;height:46px;border-radius:14px;font-size:31px;flex-shrink:0}
.vb-eyebrow{font-size:11px;font-weight:750;letter-spacing:1.6px;line-height:1.5;color:var(--vb-muted)}
#vocab-battle h1{font-size:24px;letter-spacing:-.6px;margin:4px 0 0;line-height:1.2;color:var(--vb-navy)}
#vocab-battle h2{color:var(--vb-navy);line-height:1.2;letter-spacing:-.6px}
.vb-tools{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.vb-intro{display:flex;align-items:center;justify-content:space-between;gap:40px;padding:34px 44px;border-radius:24px;background:var(--vb-navy);color:#fff;margin-bottom:26px;overflow:hidden}
.vb-pill{display:inline-flex;align-items:center;gap:6px;background:#e9eef8;color:var(--vb-navy);padding:7px 11px;border-radius:8px;font-size:11px;font-weight:800;letter-spacing:.7px;line-height:1.4}
.vb-intro .vb-pill{background:#29466c;color:#ffdf8b}
#vocab-battle .vb-intro h2{color:#fff;font-size:clamp(30px,4vw,48px);margin:18px 0 14px;letter-spacing:-1.4px}
.vb-intro p{color:#d6e4f7;line-height:1.65;font-size:15px;margin:0}
.vb-preview{display:grid;grid-template-columns:repeat(2,92px);gap:12px;transform:rotate(-8deg);margin-right:25px}
.vb-preview span{height:85px;border-radius:16px;display:grid;place-items:center;background:#417edf;font-size:36px;font-weight:800;color:#fff;box-shadow:0 5px 0 #163b73}
.vb-preview span:last-child{background:var(--vb-gold);color:var(--vb-navy);transform:rotate(12deg) scale(1.08)}
.vb-settings-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.vb-config{padding:26px;background:#fff;border:1px solid var(--vb-line);border-radius:19px;min-width:0}
#vocab-battle h3{font-size:17px;margin:0 0 23px;color:var(--vb-navy)}
.vb-config label,.vb-names label{display:block;font-size:13px;font-weight:650;color:var(--vb-text);margin-bottom:18px}
#vocab-battle select,#vocab-battle input:not([type=checkbox]):not([type=range]){display:block;width:100%;max-width:100%;min-height:45px;border:1px solid #c9d3e2;background:#fff;color:var(--vb-text);padding:10px 12px;border-radius:10px;margin-top:8px;font-size:15px}
.vb-two,.vb-names{display:grid;grid-template-columns:1fr 1fr;gap:0 15px}
.vb-note{color:var(--vb-muted);font-size:13px;line-height:1.65;margin:10px 0 16px}
.vb-path{display:flex;flex-wrap:wrap;gap:8px;margin:20px 0 14px}
.vb-path span{font-size:12px;color:#234e80;background:#edf4ff;border-radius:8px;padding:9px 10px}
.vb-config label.vb-range{display:grid;grid-template-columns:1fr auto;gap:12px;margin:22px 0 12px}
.vb-range input{width:100%;grid-column:1/-1;accent-color:var(--vb-blue);min-height:30px;margin:0}
.vb-power-settings{border:1px solid var(--vb-line);border-radius:19px;padding:24px;background:#fff;margin-top:24px}
.vb-power-settings summary{cursor:pointer;font-size:17px;font-weight:750;line-height:1.5}
.vb-power-settings summary span{display:inline-block;margin-left:12px;font-size:12px;color:var(--vb-muted);font-weight:500}
.vb-power-toolbar{display:flex;align-items:center;justify-content:space-between;gap:20px;margin:15px 0 22px}
.vb-power-toolbar p{font-size:13px;line-height:1.6;color:var(--vb-muted);margin:0;max-width:500px}
.vb-power-toolbar>div{display:flex;gap:8px;flex-shrink:0}
.vb-event-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}
.vb-event-option{display:flex;align-items:flex-start;gap:10px;border:1px solid var(--vb-line);border-radius:12px;padding:14px;cursor:pointer;min-width:0}
.vb-event-option:has(input:checked){background:#f4f8ff;border-color:#b2c8eb}
.vb-event-option input,.vb-check input{width:18px;height:18px;accent-color:var(--vb-blue);flex-shrink:0;margin:3px 0 0}
.vb-option-icon{font-size:24px;line-height:1.3}
.vb-event-option strong{font-size:12px;line-height:1.5;display:block;color:var(--vb-navy)}
.vb-event-option small{font-size:12px;color:var(--vb-muted);line-height:1.5;display:block;margin-top:5px}
.vb-check{display:flex;align-items:center;gap:10px;font-size:14px;line-height:1.5;margin:24px 0 0;cursor:pointer}
.vb-start-row{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:24px 0 0}
#vb-plan{font-size:16px;font-weight:750;line-height:1.6;margin:0}
.vb-start-row .vb-note{margin-bottom:0}
.vb-start-row>button{flex-shrink:0}
.vb-error{background:#ffeded;color:#8d2020;padding:15px;border-radius:12px}
.vb-match-line{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:20px}
.vb-match-line>div:first-child{display:flex;align-items:center;gap:12px;flex-wrap:wrap;min-width:0}
#vb-lesson-title{font-size:14px;color:var(--vb-muted);overflow-wrap:anywhere}
.vb-scoreboard{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:10px;margin-bottom:28px}
.vb-team{text-align:center;background:#fff;border:2px solid var(--vb-line);border-radius:16px;padding:16px 10px;min-width:0;position:relative}
.vb-team>span{display:block;font-size:15px;font-weight:750;overflow-wrap:anywhere;line-height:1.3}
.vb-team>strong{display:block;font-size:36px;letter-spacing:-1px;line-height:1.3;margin:7px 0;font-variant-numeric:tabular-nums;overflow-wrap:anywhere}
.vb-team>small{display:block;font-size:10px;font-weight:750;letter-spacing:1.4px;color:var(--vb-muted)}
.vb-team-active{background:var(--vb-gold);border-color:#dea929;box-shadow:0 5px 0 #e4b33e38}
.vb-team-active>small{color:#604403}
.vb-board-heading{display:flex;align-items:center;justify-content:space-between;gap:18px}
.vb-board-heading h2{font-size:24px;margin:0;overflow-wrap:anywhere}
.vb-board-heading>span{font-size:13px;color:var(--vb-muted);white-space:nowrap}
.vb-board{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px;margin:20px 0 28px}
#vocab-battle .vb-tile{position:relative;min-height:115px;border:0;border-radius:19px;background:linear-gradient(145deg,#337fed,#2359bd);color:#fff;box-shadow:0 6px 0 #1c4897;isolation:isolate;overflow:hidden;font-size:42px;font-weight:850;padding:18px}
#vocab-battle .vb-tile:before{content:'✦';position:absolute;right:13px;bottom:-11px;font-size:78px;color:#ffffff0c;z-index:-1}
#vocab-battle .vb-tile:hover:not(:disabled){background:var(--vb-gold);color:var(--vb-navy);transform:translateY(-4px) rotate(-1deg);box-shadow:0 9px 0 #d7a538}
#vocab-battle .vb-tile:disabled{background:#e1e7f0;color:#74829a;box-shadow:none;opacity:1}
#vocab-battle .vb-tile:focus-visible{outline-color:#bd7900;outline-offset:4px}
.vb-question{background:#fff;border:1px solid var(--vb-line);border-radius:22px;overflow:hidden;box-shadow:0 14px 45px #152e4e0c;animation:vb-enter .28s ease-out}
.vb-card-top{display:flex;align-items:center;justify-content:space-between;gap:20px;background:var(--vb-navy);padding:19px 27px;color:#fff}
#vocab-battle .vb-card-top h2{font-size:16px;color:#fff;letter-spacing:0;margin:0;overflow-wrap:anywhere}
.vb-card-top>span{font-size:14px;font-weight:750;color:var(--vb-gold);flex-shrink:0}
.vb-question-body{text-align:center;padding:38px 30px 22px;max-width:1050px;margin:auto}
.vb-prompt{font-size:clamp(25px,3.7vw,43px);line-height:1.4;font-weight:650;overflow-wrap:anywhere;margin:16px 0 36px}
.vb-answer{font-size:clamp(26px,4vw,46px);color:#2660bd;font-weight:700;line-height:1.6;letter-spacing:3px;overflow-wrap:anywhere;margin:16px 0 24px;white-space:pre-wrap}
.vb-answer-revealed{letter-spacing:0;color:#207351}
.vb-actions{display:flex;align-items:center;justify-content:center;gap:12px;flex-wrap:wrap;padding:0 24px 32px}
#vocab-battle #vb-correct{background:#e6f5ec;border-color:#aacfb9;color:#1b603f}
#vocab-battle #vb-wrong{background:#fff1ec;border-color:#e5c4b7;color:#873b25}
.vb-event,.vb-round-end,.vb-finish{position:relative;text-align:center;padding:32px 28px 38px;border-radius:22px;background:#fff8df;border:1px solid #e9d69c;overflow:hidden;animation:vb-enter .3s ease-out}
.vb-event-icon{display:block;font-size:84px;line-height:1.4;margin:12px 0;animation:vb-pop .5s ease-out}
#vocab-battle .vb-event h2,#vocab-battle .vb-round-end h2{font-size:34px;margin:12px 0}
.vb-event>p:not(.vb-note),.vb-round-end>p{font-size:20px;line-height:1.6;max-width:780px;margin:14px auto;overflow-wrap:anywhere}
.vb-deltas{list-style:none;padding:0;margin:22px auto;display:flex;flex-wrap:wrap;justify-content:center;gap:12px;max-width:900px}
.vb-deltas li{display:flex;flex-direction:column;gap:8px;min-width:130px;padding:14px 20px;border-radius:12px;background:#ffffffb8;overflow-wrap:anywhere}
.vb-deltas li span{font-size:13px}.vb-deltas li strong{font-size:20px}
.vb-event[data-event=boom],.vb-event[data-event=baam],.vb-event[data-event=shark]{background:#fff0ea;border-color:#efc3b2}
.vb-event[data-event=virus],.vb-event[data-event=eraser]{background:#efedff;border-color:#d2ccec}
.vb-event[data-event=heart],.vb-event[data-event=fairy]{background:#fff0f7;border-color:#ecc7dc}
.vb-event[data-event=rocket],.vb-event[data-event=magnet]{background:#e9f4ff;border-color:#bad5f0}
.vb-finish{background:#fff;border-color:var(--vb-line)}
.vb-trophy{font-size:78px;display:block;position:relative;margin:8px 0 20px}
#vocab-battle .vb-finish h2{position:relative;font-size:clamp(27px,3.6vw,42px);margin:0 auto 15px;max-width:850px;overflow-wrap:anywhere}
.vb-finish>p{color:var(--vb-muted);font-size:14px;line-height:1.6}
.vb-final-stats{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;max-width:700px;margin:25px auto 30px}
.vb-final-stats>div{padding:20px 14px;background:#f1f5fb;border-radius:13px;min-width:0}
.vb-final-stats strong{font-size:26px;display:block;overflow-wrap:anywhere}.vb-final-stats span{font-size:12px;display:block;margin-top:8px;color:var(--vb-muted)}
#vb-review-section{max-width:820px;margin:25px auto;padding:24px 0;border-top:1px solid var(--vb-line)}
#vb-review-section h3{margin-bottom:10px}
.vb-review{padding:0;margin:18px 0 22px;list-style:none;text-align:left}
.vb-review li{display:grid;grid-template-columns:1fr 1fr;gap:18px;padding:12px 0;border-bottom:1px solid var(--vb-line);font-size:14px;line-height:1.5;overflow-wrap:anywhere}
.vb-review span{color:var(--vb-muted)}
.vb-history{margin:26px 0 0;padding:18px 0;border-top:1px solid var(--vb-line);font-size:13px;color:var(--vb-muted)}
.vb-history summary{cursor:pointer;min-height:35px;line-height:1.6}
.vb-history ol{max-height:260px;overflow:auto;line-height:1.7;padding-left:24px}.vb-history li{padding:7px;overflow-wrap:anywhere}
.vb-confetti{position:absolute;inset:0 0 auto;height:220px;pointer-events:none;overflow:hidden}
.vb-confetti i{position:absolute;top:-15px;width:9px;height:19px;background:#e4ae28;left:10%;animation:vb-fall 2s ease-out both;transform:rotate(20deg)}
.vb-confetti i:nth-child(2){left:22%;background:#386ed0;animation-delay:.1s}.vb-confetti i:nth-child(3){left:35%;animation-delay:.3s;background:#269480}.vb-confetti i:nth-child(4){left:47%;animation-delay:.05s}.vb-confetti i:nth-child(5){left:60%;animation-delay:.25s;background:#7e61cd}.vb-confetti i:nth-child(6){left:73%;animation-delay:.2s;background:#386ed0}.vb-confetti i:nth-child(7){left:83%;animation-delay:.4s;background:#de788c}.vb-confetti i:nth-child(8){left:93%;animation-delay:.15s}
.vb-sr-only{position:absolute;width:1px;height:1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
@keyframes vb-enter{from{opacity:0;transform:translateY(8px) scale(.98)}to{opacity:1;transform:none}}
@keyframes vb-pop{0%{transform:scale(.6) rotate(-10deg)}65%{transform:scale(1.12) rotate(5deg)}100%{transform:none}}
@keyframes vb-fall{to{transform:translateY(245px) rotate(220deg);opacity:0}}
#home-battle{display:flex;align-items:center;gap:16px;width:100%;padding:21px 24px;margin:18px 0;background:#102c53;border-color:#102c53;color:#fff;border-radius:17px;text-align:left}
#home-battle>span:first-child{font-size:28px;color:#ffd36b}#home-battle>span:nth-child(2){flex:1}#home-battle strong{display:block;font-size:18px}#home-battle small{display:block;margin-top:6px;line-height:1.5;color:#d5e5fa;font-size:12px}
.mode-nav{flex-wrap:wrap}
.lesson-top:has(#course-battle){flex-wrap:wrap;gap:12px}
#course-battle{font-size:12px}
@media(min-width:1500px){.vb-shell{padding-top:32px}.vb-board{gap:18px}#vocab-battle .vb-tile{min-height:136px}}
@media(max-width:950px){.vb-shell{padding:22px}.vb-top{align-items:flex-start}.vb-top .vb-tools{justify-content:flex-end}.vb-event-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.vb-intro{padding:28px}.vb-match-line{align-items:flex-start;flex-direction:column}.vb-scoreboard{grid-template-columns:repeat(auto-fit,minmax(135px,1fr))}.vb-power-toolbar{align-items:flex-start;flex-direction:column}}
@media(max-width:600px){.vb-shell{padding:17px 14px 24px}.vb-top{flex-direction:column;gap:15px;margin-bottom:18px}.vb-top .vb-tools{justify-content:flex-start;width:100%}#vocab-battle .vb-top button{font-size:12px;flex:1;padding:10px 7px}.vb-eyebrow{font-size:10px}#vocab-battle h1{font-size:22px}.vb-intro{padding:25px 22px;gap:16px}.vb-intro .vb-pill{font-size:9px}.vb-preview{display:none}.vb-settings-grid{grid-template-columns:1fr;gap:15px}.vb-config{padding:20px}.vb-names,.vb-two{gap:0 12px}.vb-config label{font-size:12px}#vocab-battle input:not([type=checkbox]):not([type=range]),#vocab-battle select{font-size:16px}.vb-power-settings{padding:18px}.vb-event-grid{grid-template-columns:1fr}.vb-power-toolbar>div{flex-wrap:wrap}.vb-power-toolbar button{font-size:12px}.vb-event-option{padding:12px}.vb-event-option strong{font-size:13px}.vb-start-row{align-items:stretch;flex-direction:column;gap:18px}.vb-scoreboard{grid-template-columns:repeat(2,minmax(0,1fr));gap:9px;margin-bottom:23px}.vb-team{padding:12px 8px}.vb-team>strong{font-size:29px;margin:4px 0}.vb-team>span{font-size:13px}.vb-board-heading{align-items:flex-start;flex-direction:column;gap:8px}.vb-board-heading h2{font-size:21px}.vb-board{grid-template-columns:repeat(4,minmax(0,1fr));gap:9px;margin-top:15px}#vocab-battle .vb-tile{font-size:28px;min-height:77px;border-radius:13px;padding:8px;box-shadow:0 4px 0 #1c4897}.vb-card-top{padding:16px;flex-wrap:wrap;gap:9px}.vb-question-body{padding:27px 19px 14px}.vb-prompt{margin-bottom:28px}.vb-answer{letter-spacing:2px}.vb-actions{padding:0 17px 24px;gap:10px}.vb-actions button{flex:1 1 140px}.vb-event,.vb-round-end,.vb-finish{padding:26px 18px}.vb-event-icon{font-size:70px}#vocab-battle .vb-event h2,#vocab-battle .vb-round-end h2{font-size:28px}.vb-event>p:not(.vb-note){font-size:17px}.vb-final-stats{gap:7px}.vb-final-stats>div{padding:15px 7px}.vb-final-stats strong{font-size:23px}.vb-final-stats span{font-size:11px}.vb-review li{grid-template-columns:1fr;gap:5px}#home-battle{padding:19px}#home-battle strong{font-size:17px}.vb-match-line .vb-tools{width:100%}.vb-match-line .vb-tools button{flex:1;font-size:11px;padding:10px 7px}}
@media(prefers-reduced-motion:reduce){#vocab-battle *,#vocab-battle *:before{animation:none!important;transition:none!important}#vocab-battle button:hover:not(:disabled){transform:none}}