:root{
  font-family:Inter,ui-rounded,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  color:#182230;background:#f6f8fc;
  --bg:#f6f8fc;--card:#fff;--line:#e2e7ef;--text:#182230;--muted:#6b7280;
  --accent:#4455ff;--accent-soft:#eef0ff;--good:#177a45;--danger:#b42318;
  --shadow:0 12px 28px rgba(17,24,39,.08)
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;min-height:100dvh;background:linear-gradient(180deg,#fbfdff 0%,#f5f7fc 100%);color:var(--text)}
button,input,select{font:inherit}button{cursor:pointer}.hidden{display:none!important}
a{color:inherit;text-decoration:none}
.app-splash{position:fixed;inset:0;z-index:9999;display:grid;place-items:center;min-height:100dvh;padding:max(18px,env(safe-area-inset-top)) 18px max(18px,env(safe-area-inset-bottom));background:radial-gradient(circle at 50% 38%,#ffffff 0 16%,#eef6ff 44%,#e8efff 100%);transition:opacity .3s ease,visibility .3s ease}.app-splash.is-leaving{opacity:0;visibility:hidden;pointer-events:none}.app-splash-card{display:grid;justify-items:center;gap:8px;text-align:center}.app-splash-card .splash-brain{display:grid;place-items:center;width:86px;height:86px;border-radius:28px;background:#fff;border:1px solid #dfe7f5;font-size:48px;box-shadow:0 14px 28px rgba(35,75,160,.12);animation:splash-float 1.7s ease-in-out infinite}.app-splash-card strong{font-size:clamp(26px,7vw,38px);font-weight:950;letter-spacing:-.04em;color:#173f9f}.app-splash-card span{font-size:13px;font-weight:800;color:#5d6d89}.app-splash-card i{width:78px;height:6px;border-radius:999px;background:linear-gradient(90deg,#ffd33d,#5dd7ff,#6756ff);animation:splash-pulse 1.15s ease-in-out infinite}@keyframes splash-float{50%{transform:translateY(-7px) scale(1.015)}}@keyframes splash-pulse{50%{transform:scaleX(.58);opacity:.6}}
.app-shell{width:min(1040px,100%);margin:0 auto;padding:max(14px,env(safe-area-inset-top)) 14px max(34px,env(safe-area-inset-bottom))}
.page{display:block}.center-page{min-height:82vh;display:flex;align-items:center;justify-content:center}
.card{background:var(--card);border:1px solid var(--line);border-radius:24px;box-shadow:var(--shadow)}
.login-card{width:min(480px,100%);padding:30px 22px;text-align:center}.brand-brain{font-size:76px;line-height:1}.brand-title{font-size:clamp(30px,7vw,48px);margin:10px 0 6px;font-weight:950;letter-spacing:-.04em}.brand-sub{color:var(--muted);margin:0 0 22px;line-height:1.6}
.primary-btn,.secondary-btn,.ghost-btn{min-height:48px;border-radius:16px;padding:0 18px;border:0;font-weight:850;display:inline-flex;align-items:center;justify-content:center;gap:8px}.primary-btn{background:var(--accent);color:white}.secondary-btn{background:var(--accent-soft);color:#2635c9;border:1px solid #cfd4ff}.ghost-btn{background:white;color:#344054;border:1px solid var(--line)}.primary-btn:disabled,.secondary-btn:disabled,.ghost-btn:disabled{opacity:.55;cursor:not-allowed}
.msg{min-height:22px;margin:10px 0 0;color:#475467}.msg.error{color:var(--danger)}.msg.success{color:var(--good)}
.topbar{display:flex;align-items:flex-start;justify-content:space-between;gap:14px;margin:6px 0 18px}.topbar h1,.topbar h2{margin:3px 0 2px;letter-spacing:-.025em}.top-actions{display:flex;gap:8px;flex-wrap:wrap;justify-content:flex-end}.eyebrow{font-size:12px;font-weight:900;letter-spacing:.13em;color:#667085;text-transform:uppercase}.muted{color:var(--muted)}
.hero{padding:22px;background:linear-gradient(135deg,#ffffff 0%,#f0f2ff 100%);border:1px solid #dfe3ff;border-radius:28px;margin-bottom:18px}.hero-row{display:flex;align-items:center;gap:16px}.mascot{font-size:58px;width:76px;height:76px;border-radius:24px;background:white;border:1px solid var(--line);display:grid;place-items:center;flex:0 0 auto}.hero h2{margin:0;font-size:clamp(24px,5vw,38px)}
.stats-strip{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:16px}.stat{background:white;border:1px solid var(--line);border-radius:18px;padding:12px;text-align:center}.stat strong{display:block;font-size:23px}.stat span{font-size:12px;color:var(--muted)}
.mission-card{padding:20px;border-radius:28px;background:linear-gradient(135deg,#fff7e8,#fff);border:1px solid #f4dfb6;margin:18px 0}.mission-head{display:flex;gap:12px;align-items:flex-start;justify-content:space-between}.mission-title{margin:0;font-size:24px}.mission-list{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:8px;margin:16px 0}.mission-chip{background:white;border:1px solid #f0dfbf;border-radius:16px;padding:10px;text-align:center;font-size:13px}.mission-chip span{display:block;font-size:26px;margin-bottom:3px}
.section-title{margin:24px 0 10px;font-size:21px}.world-grid,.choice-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.world-card,.choice-card{background:white;border:1px solid var(--line);border-radius:22px;padding:17px;text-align:left;min-width:0}.world-card{display:block}.world-card .icon,.choice-card .icon,.child-card .icon{font-size:38px;display:block}.world-card b,.choice-card b,.child-card b{display:block;margin-top:8px;font-size:17px}.world-card small,.choice-card small,.child-card small{display:block;margin-top:4px;color:var(--muted);line-height:1.45}.world-card:active,.choice-card:active,.child-card:active{transform:scale(.985)}.children-topbar{align-items:flex-start}.children-panel{padding:22px 18px;background:linear-gradient(180deg,#ffffff 0%,#fbfcff 100%)}.children-panel-note{margin-top:0;margin-bottom:14px}.children-list{display:grid;gap:12px}.child-list-empty{padding:18px 16px;border:1px dashed #d6dceb;border-radius:20px;background:#fbfcff;text-align:center}.child-list-empty .icon{display:block;font-size:34px}.child-list-empty b{display:block;margin-top:10px;font-size:18px}.child-list-empty small{display:block;margin-top:6px;color:var(--muted);line-height:1.45}.child-row{width:100%;display:grid;grid-template-columns:74px minmax(0,1fr) 110px;align-items:center;gap:16px;padding:14px 16px;border:1.5px solid #d8e0ee;border-radius:24px;background:#fff;text-align:left;min-height:96px;box-shadow:0 8px 18px rgba(17,24,39,.04)}.child-row:active{transform:scale(.992)}.child-row-avatar{width:74px;height:74px;border-radius:22px;display:grid;place-items:center;background:linear-gradient(145deg,#eef2ff,#fff8e3);border:1px solid #dfe5f2;font-size:42px;box-shadow:inset 0 1px 0 rgba(255,255,255,.9)}.child-row-main{display:grid;gap:8px;min-width:0}.child-row-name{display:block;font-size:24px;font-weight:950;letter-spacing:-.03em;line-height:1.05;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.child-row-meta{display:flex;align-items:center;gap:8px;min-width:0;color:#596273;font-size:14px;font-weight:800;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.child-row-meta span,.child-row-meta i{flex:0 0 auto}.child-row-meta .avatar-label{min-width:0;overflow:hidden;text-overflow:ellipsis}.meta-dot{font-size:15px}.child-row-cta{display:flex;align-items:center;justify-content:flex-end;gap:10px;min-width:0}.play-pill{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:0 16px;border-radius:16px;background:linear-gradient(135deg,#3157ff 0%,#1677ff 100%);border:1px solid #2455ee;color:#fff;font-size:17px;font-weight:950;letter-spacing:-.01em;white-space:nowrap;box-shadow:0 10px 22px rgba(37,86,238,.25),inset 0 1px 0 rgba(255,255,255,.24)}.child-row-arrow{font-size:28px;line-height:1;color:#9aa4b2;font-weight:700}
.form-card{margin-top:18px;padding:20px}.form-card h3{margin-top:0}.field{display:block;margin:13px 0;font-weight:800}.field input,.field select{width:100%;min-height:48px;margin-top:7px;padding:0 13px;border-radius:14px;border:1px solid #cfd6e1;background:white;font-size:16px}
.bottom-nav{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:24px;padding-top:14px;border-top:1px solid var(--line)}.nav-btn{min-height:54px;border-radius:16px;background:white;border:1px solid var(--line);display:flex;align-items:center;justify-content:center;gap:7px;font-weight:800}.nav-btn.active{background:var(--accent-soft);border-color:#cbd0ff;color:#2f3dcc}
.world-hero{padding:22px;border:1px solid var(--line);border-radius:28px;background:white;margin-bottom:16px}.world-title-row{display:flex;gap:14px;align-items:center}.world-hero .world-icon{font-size:54px}.world-hero h1{margin:0;font-size:clamp(26px,6vw,40px)}.story{margin:12px 0 0;color:#475467;line-height:1.6}
.play-panel{padding:20px;margin-top:16px}.question-wrap{text-align:center;padding:18px 8px}.question-eyebrow{font-weight:900;color:#667085;font-size:13px}.question{font-size:clamp(34px,10vw,62px);font-weight:950;letter-spacing:-.03em;margin:10px 0 16px}.answer-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.answer-btn{min-height:64px;border-radius:18px;border:1px solid #d8deea;background:white;font-size:22px;font-weight:900}.answer-btn.correct{background:#e9f8ef;border-color:#8bd0a6;color:#166534}.answer-btn.wrong{background:#fff0ef;border-color:#f3aaa4;color:#9f1d16}.feedback{text-align:center;min-height:42px;font-weight:900;font-size:18px;margin-top:10px}.session-bar{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin:10px 0}.session-pill{border:1px solid var(--line);border-radius:14px;padding:9px;text-align:center;background:#fbfcfe}.session-pill strong{display:block}.session-pill span{font-size:11px;color:var(--muted)}
.parent-gate{width:min(520px,100%);padding:24px;margin:40px auto}.parent-gate h2{margin-top:0}.progress-grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:10px}.skill-card{background:white;border:1px solid var(--line);border-radius:20px;padding:14px}.skill-card strong{display:block;font-size:24px}.skill-card span{font-size:12px;color:var(--muted)}.progress-bar{height:8px;background:#edf0f5;border-radius:99px;overflow:hidden;margin-top:10px}.progress-bar i{display:block;height:100%;background:var(--accent);border-radius:99px}
.notice{padding:14px 16px;border-radius:16px;background:#f8fafc;border:1px solid var(--line);color:#475467;line-height:1.55}.pill{display:inline-flex;align-items:center;gap:6px;padding:7px 10px;border-radius:999px;background:#f3f5f8;color:#475467;font-size:12px;font-weight:800}
@media(hover:hover) and (pointer:fine){.world-card:hover,.choice-card:hover,.answer-btn:hover{border-color:#aeb7ff;transform:translateY(-1px)}.child-row:hover{border-color:#82a3ff;transform:translateY(-1px);box-shadow:0 12px 24px rgba(68,85,255,.08)}}
@media(max-width:760px){.mission-list{grid-template-columns:repeat(3,1fr)}.progress-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:560px){.app-shell{padding:max(10px,env(safe-area-inset-top)) 10px max(26px,env(safe-area-inset-bottom))}.topbar{flex-direction:row;align-items:flex-start;gap:8px;margin-bottom:14px}.topbar>div:first-child{min-width:0;flex:1}.topbar h1{font-size:clamp(22px,7vw,28px);margin-top:8px}.top-actions{justify-content:flex-end;gap:6px;flex-wrap:nowrap}.top-actions .ghost-btn,.topbar>a.ghost-btn{min-height:42px;padding:0 11px;border-radius:14px;font-size:13px;white-space:nowrap}.world-grid,.children-grid,.choice-grid{grid-template-columns:1fr 1fr}.mission-list{grid-template-columns:repeat(2,1fr)}.stats-strip{grid-template-columns:repeat(3,1fr)}.hero-row{align-items:flex-start}.mascot{width:64px;height:64px;font-size:48px}.bottom-nav{position:sticky;bottom:max(8px,env(safe-area-inset-bottom));background:rgba(246,248,252,.94);backdrop-filter:blur(10px);padding:8px max(8px,env(safe-area-inset-left)) max(8px,env(safe-area-inset-bottom)) max(8px,env(safe-area-inset-right));border:1px solid var(--line);border-radius:20px;z-index:5}.progress-grid{grid-template-columns:1fr 1fr}}
@media(max-width:360px){.topbar{flex-direction:column}.top-actions{width:100%;display:grid;grid-template-columns:1fr 1fr}.top-actions .ghost-btn{width:100%}.world-grid,.children-grid,.choice-grid{grid-template-columns:1fr}.stats-strip{grid-template-columns:1fr 1fr 1fr}.mission-list{grid-template-columns:1fr 1fr}.answer-grid{grid-template-columns:1fr}}

/* ===== Thành phố Tia Chớp / Reaction v3 ===== */
.reaction-world{--rx-soft:#f5f7ff;--rx-line:#dfe4ff;--rx-deep:#2f3dcc}
.reaction-hero{background:linear-gradient(135deg,#ffffff 0%,#f5f7ff 60%,#fffdf3 100%);border-color:#dfe4ff}
.reaction-rule{margin-top:16px;display:flex;align-items:center;gap:10px;padding:12px 14px;border-radius:18px;background:#fff;border:1px solid var(--rx-line)}
.reaction-rule>span{font-size:28px}.reaction-rule p{margin:0;line-height:1.5;color:#475467}
.section-heading-row{display:flex;align-items:end;justify-content:space-between;gap:12px;margin:20px 0 10px}.section-title.compact{margin:4px 0 0}
.reaction-mode-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
.reaction-mode-card{position:relative;min-height:174px;padding:18px;text-align:left;border:1px solid var(--line);border-radius:24px;background:#fff;color:var(--text);overflow:hidden}
.reaction-mode-card.featured{grid-column:1/-1;min-height:150px;background:linear-gradient(135deg,#fff9e9,#f7f8ff);border-color:#ebdbac}
.mode-scene{display:block;font-size:42px;line-height:1.15}.reaction-mode-card b{display:block;font-size:19px;margin-top:12px}.reaction-mode-card small{display:block;color:var(--muted);line-height:1.45;margin-top:5px}.mode-tag{display:inline-flex;margin-top:12px;padding:6px 9px;border-radius:999px;background:#f4f6fa;color:#596273;font-size:11px;font-weight:900}
.reaction-play-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:12px 0}.reaction-mode-title{margin:3px 0 0;font-size:24px}
.reaction-panel{overflow:hidden}.reaction-session-bar{grid-template-columns:repeat(4,1fr)}
.lightning-track{height:8px;background:#eef1f6;border-radius:999px;overflow:hidden;margin:0 2px 6px}.lightning-track i{display:block;width:0;height:100%;background:linear-gradient(90deg,#6979ff,#f0c94c);border-radius:999px;transition:width .25s ease}
.reaction-question-wrap{padding-top:12px}.mission-hint{display:inline-flex;min-height:34px;align-items:center;justify-content:center;padding:7px 12px;border-radius:999px;background:#f6f7fb;color:#596273;font-size:13px;font-weight:850}.reaction-question{font-size:clamp(30px,8vw,54px);margin-top:12px}.reaction-stage{margin:8px auto 14px}.reaction-answers{margin-top:8px}
.energy-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.energy-btn{min-height:112px;font-size:22px}.energy-btn span{display:block;font-size:34px}.energy-btn strong{display:block;font-size:clamp(28px,7vw,42px);margin-top:4px}
.color-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}.color-tile{min-height:96px;border:2px solid transparent;border-radius:20px;background:#fff;font-weight:950}.color-tile span{display:block;font-size:34px}.color-tile b{display:block;margin-top:5px;font-size:12px}.color-word{display:inline-block;padding:2px 10px;border-radius:12px;background:#f6f7fb}.c-red{color:#a52420}.c-blue{color:#2457a7}.c-green{color:#16734a}.c-yellow{color:#8a6500}.c-purple{color:#6b3ca0}.c-orange{color:#a84e16}
.color-tile.c-red{background:#fff4f3;border-color:#ffd4d0}.color-tile.c-blue{background:#f1f6ff;border-color:#cfdeff}.color-tile.c-green{background:#f0fbf5;border-color:#c9eed9}.color-tile.c-yellow{background:#fffbea;border-color:#f3e3a3}.color-tile.c-purple{background:#faf3ff;border-color:#e6cff8}.color-tile.c-orange{background:#fff6ef;border-color:#f4d4bd}
.target-stage{display:grid;grid-template-columns:repeat(var(--target-cols),minmax(0,1fr));gap:7px;max-width:560px}.target-tile{aspect-ratio:1;border:1px solid var(--line);border-radius:15px;background:#fff;font-size:clamp(22px,6vw,34px);font-weight:950;min-width:0}
.order-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;max-width:520px;margin:0 auto}.order-tile{min-height:78px;border:1px solid #d8deea;border-radius:18px;background:#fff;font-size:28px;font-weight:950}.order-tile.correct{background:#e9f8ef;border-color:#8bd0a6;color:#166534}.order-tile.wrong,.target-tile.wrong,.color-tile.wrong{background:#fff0ef!important;border-color:#f3aaa4!important;color:#9f1d16}.target-tile.correct,.color-tile.correct{outline:3px solid #8bd0a6;background:#e9f8ef!important}
.feedback.good{color:#177a45}.feedback.gentle{color:#6a5b20}.reaction-result{text-align:center;padding:22px 8px}.result-burst{font-size:64px}.reaction-result h2{font-size:clamp(25px,6vw,36px);margin:7px 0}.result-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:9px;margin:20px 0}.result-grid>div{padding:13px 8px;border:1px solid var(--line);border-radius:17px;background:#fbfcfe}.result-grid strong{display:block;font-size:22px}.result-grid span{font-size:11px;color:var(--muted)}.brain-reward{display:flex;align-items:center;justify-content:center;gap:12px;padding:14px;border-radius:18px;background:#fff9e9;border:1px solid #efdfb6;text-align:left}.brain-reward>span{font-size:32px}.brain-reward b,.brain-reward small{display:block}.brain-reward small{margin-top:4px;color:#6a6250}.result-actions{display:flex;flex-wrap:wrap;justify-content:center;gap:8px;margin-top:18px}
@media(hover:hover) and (pointer:fine){.reaction-mode-card:hover,.color-tile:hover,.target-tile:hover,.order-tile:hover{transform:translateY(-1px);border-color:#aeb7ff}}
@media(max-width:620px){.reaction-session-bar{grid-template-columns:repeat(2,1fr)}.result-grid{grid-template-columns:repeat(2,1fr)}.color-grid{grid-template-columns:repeat(2,1fr)}.reaction-mode-card{min-height:164px}}
@media(max-width:390px){.reaction-mode-grid{grid-template-columns:1fr}.reaction-mode-card.featured{grid-column:auto}.energy-grid{grid-template-columns:1fr 1fr}.order-grid{grid-template-columns:repeat(3,1fr)}.reaction-play-head{align-items:flex-start;flex-direction:column}}
@media(prefers-reduced-motion:reduce){.lightning-track i,.reaction-mode-card,.target-tile,.order-tile,.color-tile{transition:none!important}}

/* ===== Foundation hardening v4 ===== */
:focus-visible{outline:3px solid #4455ff;outline-offset:3px}
button,a,input,select{touch-action:manipulation}
.info-card{cursor:default}
.sync-note{font-size:12px;color:#667085;margin:8px 0 0}
.stats-four{grid-template-columns:repeat(4,1fr)}
.range-tabs{display:inline-flex;gap:6px;padding:5px;background:#eef1f6;border-radius:16px;margin:4px 0 8px}
.range-btn{min-height:42px;border:0;border-radius:12px;padding:0 16px;background:transparent;font-weight:850;color:#596273}
.range-btn.active{background:#fff;color:#2f3dcc;box-shadow:0 2px 8px rgba(17,24,39,.06)}
.parent-hold{position:relative;overflow:hidden;width:100%;min-height:58px;margin:12px 0;border:1px solid #cfd4ff;border-radius:17px;background:#f6f7ff;color:#2635c9;font-weight:900}
.parent-hold span{position:relative;z-index:2}.parent-hold i{position:absolute;inset:auto auto 0 0;height:6px;width:0;background:#4455ff;z-index:1}
.parent-insights{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:16px 0}.insight-card{padding:16px;border-radius:20px;border:1px solid var(--line);background:#fff}.insight-card span{display:block;font-size:12px;color:var(--muted);font-weight:800}.insight-card strong{display:block;margin-top:7px;font-size:18px}
.report-card{padding:18px;margin-top:16px}.daily-chart{display:grid;grid-template-columns:repeat(7,minmax(24px,1fr));gap:6px;min-height:190px;align-items:end}.day-col{text-align:center;min-width:0}.day-bar-wrap{height:120px;display:flex;align-items:end;justify-content:center;background:#f6f7fb;border-radius:12px;padding:5px}.day-bar-wrap i{width:min(26px,70%);min-height:2px;border-radius:999px 999px 5px 5px;background:#4455ff}.day-col b{display:block;margin-top:5px;font-size:12px}.day-col span{display:block;font-size:10px;color:var(--muted);white-space:nowrap}
.result-screen{padding:24px 8px}.result-burst{font-size:64px}.result-actions{display:flex;justify-content:center;gap:8px;flex-wrap:wrap;margin-top:18px}
.observation-tile{aspect-ratio:1;min-height:54px;font-size:clamp(22px,6vw,34px)}

/* ===== Vương quốc Con Số v4 ===== */
.number-hero{background:linear-gradient(135deg,#fff 0%,#f6f4ff 55%,#fff8e6 100%)}
.world-svg{width:78px;height:78px;border-radius:22px;flex:0 0 auto}
.number-mode-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
.number-mode-card{position:relative;display:grid;grid-template-columns:68px 1fr;grid-template-rows:auto auto auto;column-gap:14px;align-items:center;min-height:155px;padding:17px;border:1px solid var(--line);border-radius:24px;background:#fff;text-align:left;color:var(--text)}
.number-mode-card img{grid-row:1/4;width:68px;height:68px;object-fit:contain}.number-mode-card b{font-size:18px}.number-mode-card small{color:var(--muted);line-height:1.4;margin-top:4px}.number-mode-card>span{font-size:11px;font-weight:850;color:#596273;margin-top:8px}
.number-mode-card.featured{grid-column:1/-1;background:linear-gradient(135deg,#fff9e7,#f6f7ff)}.number-mode-card.locked{opacity:.62;cursor:not-allowed}
.number-panel{overflow:hidden}.boss-stage{position:relative;display:grid;place-items:center;min-height:215px;padding:42px 12px 8px;background:linear-gradient(180deg,#f7f6ff,#fff);border-radius:20px;margin-top:10px}.boss-stage>img{width:min(190px,48vw);height:145px;object-fit:contain}.boss-health{position:absolute;left:14px;right:14px;top:12px}.boss-health span{display:block;font-size:12px;font-weight:850;color:#596273;margin-bottom:5px}.hp-track{height:12px;background:#eceef4;border-radius:999px;overflow:hidden}.hp-track i{display:block;width:100%;height:100%;background:#6b5bd4;border-radius:999px;transition:width .28s ease}.hit-fx{position:absolute;font-size:54px;opacity:0;pointer-events:none}.hit-fx.show{animation:hit-pop .45s ease}.boss-hit{animation:boss-shake .35s ease}.gem-grid{max-width:650px;margin:0 auto}.gem-answer span{display:block;font-size:26px}.gem-answer b{display:block;font-size:24px;margin-top:3px}
@keyframes hit-pop{0%{opacity:0;transform:scale(.4)}45%{opacity:1;transform:scale(1.25)}100%{opacity:0;transform:scale(1.5)}}
@keyframes boss-shake{0%,100%{transform:translateX(0)}25%{transform:translateX(-7px)}70%{transform:translateX(7px)}}

@media(max-width:760px){.stats-four{grid-template-columns:repeat(2,1fr)}.number-mode-grid{grid-template-columns:1fr 1fr}}
@media(max-width:560px){.parent-insights{grid-template-columns:1fr}.daily-chart{gap:4px}.number-mode-grid{grid-template-columns:1fr}.number-mode-card.featured{grid-column:auto}.world-svg{width:64px;height:64px}.number-mode-card{grid-template-columns:60px 1fr}.number-mode-card img{width:58px;height:58px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.boss-hit,.hit-fx.show{animation:none}.hp-track i{transition:none}}
.profile-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:16px}.privacy-mini{font-size:13px;margin-top:16px}.danger-btn{min-height:48px;border-radius:16px;padding:0 18px;border:1px solid #f0b4ae;background:#fff3f2;color:#a51f18;font-weight:850}.data-control{margin-top:16px}
.daily-chart{display:block;min-height:190px;overflow-x:auto;padding-bottom:4px}.daily-chart-track{display:grid;gap:6px;min-height:190px;align-items:end}
.skill-value-row{display:flex;align-items:baseline;justify-content:space-between;gap:8px}.skill-trend{font-style:normal;font-size:11px;font-weight:850;color:#667085}.skill-trend.up{color:#177a45}.skill-trend.down{color:#9a5b16}.skill-trend.flat{color:#667085}

/* ===== Siêu Trí Tuệ v5 — visual/game-first layer ===== */
html[data-motion="off"] *,html[data-motion="off"] *::before,html[data-motion="off"] *::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}
.login-page{padding-top:24px;padding-bottom:24px}.login-layout{width:min(960px,100%);display:grid;grid-template-columns:minmax(260px,.9fr) minmax(320px,1.1fr);gap:22px;align-items:center}.login-visual{position:relative;display:grid;place-items:center;min-height:420px;border-radius:38px;background:radial-gradient(circle at 50% 42%,#fff 0 22%,transparent 23%),linear-gradient(145deg,#eef1ff,#fff9e7);border:1px solid #e0e4ff;overflow:hidden}.login-visual>img{width:min(330px,82%);filter:drop-shadow(0 18px 24px rgba(49,56,124,.13));animation:float-mascot 3.4s ease-in-out infinite}.floating-stars span{position:absolute;font-size:32px;animation:float-star 3s ease-in-out infinite}.floating-stars span:nth-child(1){left:12%;top:18%}.floating-stars span:nth-child(2){right:13%;top:24%;animation-delay:.5s}.floating-stars span:nth-child(3){right:20%;bottom:16%;animation-delay:1s}.login-card{width:100%;padding:32px 26px}.promise-row{display:flex;flex-wrap:wrap;gap:7px;justify-content:center;margin:0 0 18px}.promise-row span{padding:7px 10px;border-radius:999px;background:#f7f8fc;border:1px solid var(--line);font-size:12px;font-weight:850;color:#536074}.wide-btn{width:100%}.big-cta{min-height:58px;padding-inline:26px;font-size:17px}.legal-links{display:flex;justify-content:center;gap:18px;margin-top:16px;font-size:13px;color:#667085}.legal-links a{text-decoration:underline;text-underline-offset:3px}.footer-links{margin:24px 0 10px}
@keyframes float-mascot{0%,100%{transform:translateY(0) rotate(-1deg)}50%{transform:translateY(-10px) rotate(1deg)}}@keyframes float-star{0%,100%{transform:translateY(0) scale(1)}50%{transform:translateY(-8px) scale(1.08)}}

.child-profile-card{display:flex;gap:15px;align-items:center}.child-profile-card .child-avatar{width:72px;height:72px;border-radius:24px;display:grid;place-items:center;font-size:42px;background:linear-gradient(145deg,#f7f8ff,#fff8e9);border:1px solid #e5e7f6;flex:0 0 auto}.child-profile-card div{min-width:0}.child-profile-card em{display:inline-block;margin-top:8px;font-size:12px;font-style:normal;font-weight:900;color:#4050d2}.avatar-field{border:0;padding:0;margin:16px 0}.avatar-field legend{font-weight:850;margin-bottom:9px}.avatar-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:9px}.avatar-option{position:relative}.avatar-option input{position:absolute;opacity:0;pointer-events:none}.avatar-option span,.avatar-option b{display:block;text-align:center}.avatar-option{padding:11px 6px;border:1px solid var(--line);border-radius:17px;background:#fff;cursor:pointer}.avatar-option span{font-size:31px}.avatar-option b{font-size:11px;margin-top:3px;color:#596273}.avatar-option:has(input:checked){border-color:#8995ff;background:#f3f5ff;box-shadow:inset 0 0 0 2px #dbe0ff}

.adventure-hero{position:relative;overflow:hidden;background:linear-gradient(135deg,#ffffff 0%,#eef1ff 62%,#fff7df 100%)}.adventure-hero::after{content:"";position:absolute;width:180px;height:180px;border-radius:50%;right:-50px;top:-60px;background:#fff;opacity:.5}.hero-mascot{width:108px;height:100px;object-fit:contain;flex:0 0 auto;z-index:1}.hero-copy{position:relative;z-index:1}.hero-story-wide{position:relative;z-index:1;margin:10px 0 0;padding:0;max-width:none;line-height:1.55;color:#475467}.daily-adventure{background:linear-gradient(135deg,#fff7df 0%,#fff 62%,#f2f4ff 100%)}.mission-path{display:flex;align-items:center;gap:8px;justify-content:space-between;margin:18px 0;overflow-x:auto;padding:4px 2px 8px}.mission-path span{min-width:92px;padding:10px;border-radius:18px;background:#fff;border:1px solid #f0dfb9;text-align:center;font-size:24px}.mission-path span b{display:block;font-size:11px;margin-top:4px;color:#596273}.mission-path i{font-style:normal;color:#9aa2b1}.world-gallery{grid-template-columns:repeat(2,minmax(0,1fr))}.visual-world-card{padding:0;overflow:hidden;display:grid;grid-template-columns:minmax(140px,44%) 1fr;align-items:stretch;min-height:190px}.visual-world-card>img{width:100%;height:100%;object-fit:cover;background:#f7f8fb}.world-card-copy{padding:16px;align-self:center}.world-card-copy .icon{font-size:29px}.world-card-copy .play-link{display:inline-flex;margin-top:10px;color:#3d4ac7;font-size:12px;font-weight:900}

.visual-hero{display:grid;grid-template-columns:minmax(240px,42%) 1fr;gap:18px;align-items:center;padding:0;overflow:hidden}.visual-hero .world-scene{width:100%;height:210px;object-fit:cover}.world-hero-copy{padding:20px 22px 20px 4px}.world-hero-copy h1{margin:0;font-size:clamp(28px,5vw,42px)}.game-mode-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.game-mode-card{min-height:162px;padding:18px;border:1px solid var(--line);border-radius:24px;background:#fff;text-align:left;color:var(--text)}.game-mode-card .mode-scene{font-size:39px}.game-mode-card b{display:block;margin-top:10px;font-size:18px}.game-mode-card small{display:block;color:var(--muted);line-height:1.45;margin-top:4px}.game-mode-card em{display:inline-flex;margin-top:11px;padding:6px 9px;border-radius:999px;background:#f4f6fa;font-style:normal;font-size:11px;font-weight:850;color:#596273}.compact-question{white-space:pre-line;font-size:clamp(28px,7vw,48px)}.stage-object{width:130px;height:105px;object-fit:contain}.stage-object.small{width:92px;height:82px}.memory-stage,.observation-stage,.logic-stage{display:flex;align-items:center;justify-content:center;gap:18px;padding:10px 8px 0;min-height:96px}.memory-board{display:grid;gap:9px;justify-content:center;margin:0 auto;max-width:650px}.flash-row{display:flex;flex-wrap:wrap;gap:9px}.memory-chip{display:grid;place-items:center;min-width:58px;height:58px;border-radius:17px;background:#fff8db;border:1px solid #ebd78f;font-size:26px;font-weight:950}.memory-chip.emoji{font-size:30px}.position-board,.pair-board{grid-template-columns:repeat(var(--memory-cols),minmax(52px,72px))}.memory-cell{aspect-ratio:1;display:grid;place-items:center;border-radius:15px;border:1px solid #dce2eb;background:#fff;font-size:27px;font-weight:900}.memory-cell.hidden-cell{background:linear-gradient(145deg,#eef1ff,#fff);color:#5060d7}.memory-order-grid{max-width:560px;margin:0 auto}.memory-order-btn{font-size:30px}.target-hint{min-width:90px;padding:9px 12px;border-radius:15px;background:#fff8e7;border:1px solid #efd7a3;font-weight:850}.observation-grid{max-width:640px;margin:0 auto}.big-symbol{font-size:34px}.logic-stage{min-height:85px}.gate-stage{text-align:center;padding:8px}.gate-stage img{width:min(420px,92%);height:190px;object-fit:contain}.gate-choice{min-height:92px}.gate-choice span{display:block;font-size:32px}.gate-choice b{display:block;margin-top:4px}.true-gate{background:#f4fff7;border-color:#cbead7}.false-gate{background:#fff5f6;border-color:#f1cbd2}

.arena-clock{display:grid;grid-template-columns:120px 1fr;gap:16px;align-items:center;padding:16px 20px;margin:0 0 14px;border-radius:24px;background:linear-gradient(135deg,#fff8df,#fff);border:1px solid #efdba7}.arena-trophy{width:110px;height:100px;object-fit:contain}.arena-clock strong{display:block;font-size:54px;line-height:1}.timer-track{height:9px;background:#efe9d7;border-radius:999px;overflow:hidden;margin-top:10px}.timer-track i{display:block;width:100%;height:100%;background:#e5a528;border-radius:999px;transition:width 1s linear}.arena-start{margin:0 auto 16px;display:flex}.memory-flash{max-width:560px;margin:12px auto;padding:18px;border-radius:20px;background:#fff8dc;border:1px solid #ecd993;font-size:clamp(26px,7vw,42px);font-weight:950;text-align:center;letter-spacing:.08em}

.tower-progress-card{display:grid;grid-template-columns:150px 1fr;gap:18px;align-items:center;padding:16px 20px;border:1px solid #ded5f6;border-radius:24px;background:linear-gradient(135deg,#f7f3ff,#fff);margin-bottom:14px}.tower-art{width:140px;height:140px;object-fit:contain}.tower-progress-card h2{margin:4px 0 10px}.mission-plan{display:flex;flex-wrap:wrap;gap:7px}.mission-plan span{padding:7px 10px;border-radius:999px;background:#fff;border:1px solid #e2ddf1;font-size:12px;font-weight:850}.mission-plan b{color:#5c47b1}

.parent-gate{text-align:center}.gate-mascot{width:145px;height:125px;object-fit:contain}.parent-summary{background:linear-gradient(135deg,#fff,#eef7ff)}.subskill-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px}.subskill-row{display:grid;grid-template-columns:minmax(120px,1fr) 1fr 38px;gap:10px;align-items:center;padding:10px 12px;border:1px solid var(--line);border-radius:15px;background:#fbfcfe;font-size:13px}.subskill-row>b{text-align:right}.mini-meter{height:7px;border-radius:999px;background:#e9edf4;overflow:hidden}.mini-meter i{display:block;height:100%;border-radius:999px;background:#6575ff}.recent-list{display:grid;gap:8px}.recent-row{padding:11px 12px;border-radius:15px;background:#f8fafc;border:1px solid var(--line)}.recent-row span,.recent-row small{display:block}.recent-row span{font-weight:850}.recent-row small{margin-top:3px;color:var(--muted)}.parent-note{margin-top:16px}
.profile-hero{display:flex;align-items:center;gap:18px;padding:20px}.profile-avatar{width:100px;height:100px;border-radius:30px;display:grid;place-items:center;background:linear-gradient(145deg,#eef1ff,#fff7dc);font-size:58px;border:1px solid #e2e5f3;flex:0 0 auto}.profile-hero h2{margin:8px 0 0}.badge-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:9px;margin-top:12px}.badge-card{padding:12px 8px;border-radius:18px;border:1px solid var(--line);text-align:center;background:#fff}.badge-card span{display:block;font-size:29px}.badge-card b,.badge-card small{display:block}.badge-card b{font-size:12px;margin-top:5px}.badge-card small{font-size:10px;color:var(--muted);margin-top:3px}.badge-card.locked{filter:grayscale(1);opacity:.48}.badge-card.unlocked{background:#fff9e8;border-color:#ead8a7}.settings-list{display:grid;gap:8px;margin-top:12px}.settings-list label{min-height:52px;border:1px solid var(--line);border-radius:15px;padding:10px 12px;display:flex;align-items:center;justify-content:space-between;gap:12px;font-weight:800}.settings-list input{width:22px;height:22px}.info-page{max-width:820px}.prose-card{padding:26px;line-height:1.7}.prose-card h2{margin:20px 0 7px}.prose-card h2:first-of-type{margin-top:0}.about-mascot{float:right;width:160px;height:140px;object-fit:contain;margin:0 0 16px 18px}.principles{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:18px 0}.principles article{padding:14px;border-radius:18px;background:#f8fafc;border:1px solid var(--line)}.principles article p{margin:5px 0 0;color:#596273}
.reward-burst-layer{position:fixed;inset:0;z-index:50;pointer-events:none;overflow:hidden}.reward-burst-layer span{position:absolute;animation:reward-pop .85s ease-out forwards;font-size:26px}@keyframes reward-pop{0%{opacity:0;transform:translate(0,0) scale(.4) rotate(0)}25%{opacity:1}100%{opacity:0;transform:translate(var(--x),var(--y)) scale(1.15) rotate(var(--r))}}

@media(hover:hover) and (pointer:fine){.visual-world-card:hover,.game-mode-card:hover,.avatar-option:hover{transform:translateY(-2px);border-color:#aeb7ff}.visual-world-card:hover img{transform:scale(1.02)}.visual-world-card img{transition:transform .22s ease}}
@media(max-width:780px){.login-layout{grid-template-columns:1fr}.login-visual{min-height:280px}.login-visual>img{width:240px}.visual-hero{grid-template-columns:1fr}.visual-hero .world-scene{height:170px}.world-hero-copy{padding:0 18px 20px}.badge-grid{grid-template-columns:repeat(2,1fr)}.subskill-grid{grid-template-columns:1fr}.principles{grid-template-columns:1fr}.tower-progress-card{grid-template-columns:110px 1fr}.tower-art{width:100px;height:120px}}
@media(max-width:620px){.visual-world-card{grid-template-columns:1fr;min-height:0}.visual-world-card>img{height:128px}.world-card-copy{padding:13px}.game-mode-grid{grid-template-columns:1fr}.avatar-grid{grid-template-columns:repeat(2,1fr)}.mission-path{justify-content:flex-start}.profile-hero{align-items:flex-start}.arena-clock{grid-template-columns:90px 1fr}.arena-trophy{width:85px}.tower-progress-card{grid-template-columns:1fr;text-align:center}.tower-art{margin:auto}.mission-plan{justify-content:center}}
@media(max-width:390px){.login-card{padding:24px 16px}.profile-hero{flex-direction:column}.about-mascot{float:none;display:block;margin:0 auto 12px}.subskill-row{grid-template-columns:1fr 70px 30px}}

@media(prefers-reduced-motion:reduce){.app-splash,.app-splash-card .splash-brain,.app-splash-card i{animation:none!important;transition:none!important}}

@media(max-width:560px){.children-panel{padding:18px 14px}.child-row{grid-template-columns:62px minmax(0,1fr) 92px;gap:12px;padding:12px 13px}.child-row-avatar{width:62px;height:62px;border-radius:18px;font-size:36px}.child-row-name{font-size:22px}.child-row-meta{font-size:13px;gap:6px}.play-pill{min-height:40px;padding:0 12px;font-size:16px}}
@media(max-width:390px){.children-topbar .eyebrow{font-size:12px}.child-row{grid-template-columns:56px minmax(0,1fr) 82px;gap:10px;padding:11px 12px}.child-row-avatar{width:56px;height:56px;border-radius:18px;font-size:33px}.child-row-name{font-size:20px}.child-row-meta{font-size:12px;gap:5px}.play-pill{min-height:38px;padding:0 10px;font-size:14px}.child-row-arrow{display:none}}

/* ===== TC10 children-page hardening ===== */
.children-topbar{margin-bottom:18px}.children-topbar>div{min-width:0}.children-topbar h1{font-size:clamp(28px,7vw,42px);line-height:1.08;margin:6px 0 8px}.children-panel .section-heading-row{align-items:center;margin-top:0}.children-panel .section-title{font-size:clamp(22px,5.6vw,30px)}.children-list{width:100%}.child-row{appearance:none;-webkit-appearance:none;color:var(--text);font:inherit;overflow:hidden}.child-row *{box-sizing:border-box}.child-row-main,.child-row-meta{overflow:hidden}.child-row-meta{display:grid;grid-template-columns:auto auto auto minmax(0,1fr);align-items:center}.child-row-meta .avatar-label{display:block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.children-footer{display:flex;justify-content:center;padding:24px 0 max(18px,env(safe-area-inset-bottom))}.logout-bottom-btn{min-width:min(100%,320px);min-height:52px}@media(max-width:560px){.child-row{grid-template-columns:58px minmax(0,1fr) 78px;gap:10px;padding:11px}.child-row-avatar{width:58px;height:58px;font-size:34px}.child-row-name{font-size:20px}.child-row-meta{font-size:12px;grid-template-columns:auto auto auto minmax(0,1fr);gap:4px}.play-pill{min-height:38px;padding:0 10px;font-size:14px}.child-row-arrow{display:none}}@media(max-width:360px){.child-row{grid-template-columns:52px minmax(0,1fr) 70px;gap:8px;padding:10px}.child-row-avatar{width:52px;height:52px;font-size:31px}.child-row-name{font-size:18px}.child-row-meta{font-size:11px}.play-pill{padding:0 8px;font-size:13px}}

.child-row:focus-visible{outline:3px solid rgba(49,87,255,.25);outline-offset:3px}.child-row:hover .play-pill{transform:translateY(-1px);box-shadow:0 13px 26px rgba(37,86,238,.30)}.play-pill{transition:transform .16s ease,box-shadow .16s ease}

/* TC15 — Home header + 3-action mobile navigation */
.home-topbar{display:block;margin-bottom:16px}.home-topbar h1{margin-top:6px}.home-bottom-nav .nav-btn{flex-direction:column;gap:3px;min-height:64px;padding:7px 5px;font-size:12px;line-height:1.15;text-align:center}.home-bottom-nav .nav-icon{display:block;font-size:22px;line-height:1}.home-bottom-nav .nav-btn:active{transform:scale(.98)}
@media(max-width:560px){.home-topbar h1{font-size:clamp(26px,8vw,32px)}.home-bottom-nav .nav-btn{min-height:62px}.home-bottom-nav .nav-icon{font-size:21px}}

@media(max-width:560px){.adventure-hero{padding:18px 16px}.adventure-hero .hero-row{gap:12px}.adventure-hero .hero-mascot{width:92px;height:86px}.adventure-hero .hero-copy h2{font-size:clamp(24px,7vw,31px);line-height:1.15}.hero-story-wide{margin-top:8px;font-size:15px;line-height:1.5}.adventure-hero .stats-strip{margin-top:14px}}


/* ===== TC19 — Đấu trường lớp học (local-only) ===== */
.classroom-entry{margin:18px 0;padding:0;overflow:hidden;border:1px solid #d9defb;background:linear-gradient(135deg,#f4f6ff 0%,#fff 54%,#fff7dc 100%)}
.classroom-entry-inner{display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:18px;padding:20px}
.classroom-entry .arena-kicker{font-size:12px;font-weight:950;letter-spacing:.12em;color:#5c63a8;text-transform:uppercase}
.classroom-entry h2{margin:5px 0 7px;font-size:clamp(23px,5vw,32px);letter-spacing:-.03em}
.classroom-entry p{margin:0;color:#667085;line-height:1.5;max-width:650px}
.classroom-entry .arena-launch{min-width:148px;min-height:52px;white-space:nowrap}
.classroom-local-note{display:inline-flex;align-items:center;gap:6px;margin-top:10px;padding:6px 9px;border-radius:999px;background:#fff;border:1px solid #e2e6f5;color:#667085;font-size:11px;font-weight:850}

.classroom-shell{max-width:920px;padding-bottom:max(34px,env(safe-area-inset-bottom))}
.classroom-topbar{align-items:center}.classroom-topbar h1{margin:3px 0;font-size:clamp(26px,6vw,38px)}
.arena-setup{padding:22px}.arena-setup-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.arena-setup-grid .field{margin:0}.arena-setup-grid .field.full{grid-column:1/-1}
.roster-editor{margin-top:18px}.roster-editor-head{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:10px}.roster-editor-head h2{margin:0;font-size:20px}.setup-roster{display:grid;gap:9px}.setup-player-row{display:grid;grid-template-columns:38px minmax(0,1fr) 44px;align-items:center;gap:9px}.setup-player-index{display:grid;place-items:center;width:38px;height:38px;border-radius:12px;background:#f2f4ff;color:#4050c8;font-weight:950}.setup-player-row input{width:100%;min-width:0;min-height:46px;padding:0 12px;border:1px solid #cfd6e1;border-radius:14px;background:#fff;font-size:16px}.remove-player-btn{width:44px;height:44px;border:1px solid #ecd2d2;border-radius:14px;background:#fff7f7;color:#a93434;font-size:20px;font-weight:900}.setup-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:14px}.local-only-banner{margin:16px 0 0;padding:12px 14px;border-radius:16px;background:#f4fbf7;border:1px solid #cfe9d9;color:#356147;font-size:13px;font-weight:750;line-height:1.45}

.arena-match-head{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:12px;align-items:center;margin-bottom:12px}.arena-match-title h1{margin:2px 0 0;font-size:clamp(24px,6vw,34px)}.arena-progress-pill{display:inline-flex;align-items:center;justify-content:center;min-height:40px;padding:0 13px;border:1px solid #d6dcf0;border-radius:999px;background:#fff;font-size:13px;font-weight:900;white-space:nowrap}
.classroom-question-card{padding:18px 18px 16px;position:relative;overflow:hidden}.classroom-question-card::after{content:"";position:absolute;right:-60px;top:-70px;width:170px;height:170px;border-radius:50%;background:#f0f3ff;z-index:0}.question-headline,.classroom-question,.memory-preview,.classroom-answers,.arena-feedback,.arena-timer{position:relative;z-index:1}.question-headline{display:flex;align-items:center;justify-content:space-between;gap:10px}.question-category{display:inline-flex;align-items:center;min-height:30px;padding:0 10px;border-radius:999px;background:#f4f6ff;border:1px solid #dce2ff;color:#4655c3;font-size:12px;font-weight:900}.arena-timer{display:flex;align-items:center;gap:8px;font-size:12px;font-weight:900;color:#596273}.arena-timer-track{width:92px;height:7px;border-radius:999px;background:#e9edf4;overflow:hidden}.arena-timer-track i{display:block;width:100%;height:100%;border-radius:inherit;background:#6b7cff;transition:width .25s linear}.classroom-question{margin:22px 0 16px;text-align:center;font-size:clamp(32px,8vw,56px);line-height:1.18;font-weight:950;letter-spacing:-.035em;white-space:pre-line}.memory-preview{display:grid;place-items:center;min-height:100px;margin:10px 0 14px;padding:16px;border-radius:20px;background:linear-gradient(135deg,#fff8dc,#fff);border:1px solid #ecd993;font-size:clamp(30px,8vw,48px);font-weight:950;letter-spacing:.08em;text-align:center}.memory-preview.covered{font-size:18px;letter-spacing:0;color:#596273;background:#f7f8fb;border-color:#e1e5ed}.classroom-answers{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:11px}.classroom-answer{min-height:84px;padding:11px 13px;border-radius:20px;border:1.5px solid #d8deeb;background:#fff;color:#182230;display:grid;grid-template-columns:34px minmax(0,1fr);align-items:center;gap:10px;text-align:left}.classroom-answer .answer-letter{display:grid;place-items:center;width:34px;height:34px;border-radius:11px;background:#eef1ff;color:#3f4ec4;font-size:15px;font-weight:950}.classroom-answer .answer-value{font-size:clamp(21px,5vw,30px);font-weight:950;line-height:1.15;min-width:0;overflow-wrap:anywhere}.classroom-answer:disabled{opacity:.48;cursor:not-allowed}.classroom-answer.ready:not(:disabled){border-color:#9aa8ff;box-shadow:0 7px 18px rgba(68,85,255,.08)}.classroom-answer.correct-reveal{border-color:#79c598;background:#f1fff6;box-shadow:0 0 0 2px #d8f3e2 inset}.classroom-answer.correct-reveal .answer-letter{background:#daf5e4;color:#177a45}
.arena-feedback{min-height:28px;margin-top:12px;text-align:center;font-weight:900}.arena-feedback.good{color:#177a45}.arena-feedback.gentle{color:#8a5a13}.arena-feedback.info{color:#4655c3}

.player-pick-card{margin-top:14px;padding:16px}.player-pick-head{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:11px}.player-pick-head h2{margin:0;font-size:20px}.selected-player-label{font-size:12px;font-weight:900;color:#4655c3;white-space:nowrap}.classroom-player-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px}.classroom-player-btn{min-height:58px;padding:9px 11px;border:1.5px solid #dce2eb;border-radius:17px;background:#fff;display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:8px;text-align:left}.classroom-player-btn .player-name{font-size:15px;font-weight:900;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.classroom-player-btn .player-score{display:inline-flex;align-items:center;justify-content:center;min-width:40px;height:30px;padding:0 8px;border-radius:999px;background:#f3f5fa;color:#475467;font-size:13px;font-weight:950}.classroom-player-btn.selected{border-color:#5970ff;background:#f2f4ff;box-shadow:0 0 0 2px #dfe4ff inset}.classroom-player-btn.locked{opacity:.42;background:#f6f7f9}.classroom-player-btn.locked .player-score::after{content:""}.classroom-player-btn:disabled{cursor:not-allowed}
.arena-control-row{display:grid;grid-template-columns:1fr 1fr 1fr;gap:9px;margin-top:12px}.arena-control-btn{min-height:48px;border-radius:15px;border:1px solid var(--line);background:#fff;font-weight:900}.arena-control-btn.undo{color:#4655c3;background:#f4f6ff;border-color:#d8defe}.arena-control-btn.skip{color:#755416;background:#fff8e5;border-color:#ecd89f}.arena-control-btn.end{color:#8c3030;background:#fff5f5;border-color:#ecd0d0}.arena-next-btn{width:100%;margin-top:12px;min-height:52px}

.arena-results{padding:22px;text-align:center}.arena-results .result-trophy{font-size:54px}.arena-results h1{margin:6px 0 4px;font-size:clamp(28px,7vw,40px)}.leaderboard{display:grid;gap:9px;margin:18px 0;text-align:left}.leader-row{display:grid;grid-template-columns:48px minmax(0,1fr) auto;align-items:center;gap:10px;padding:12px 13px;border:1px solid var(--line);border-radius:17px;background:#fff}.leader-rank{font-size:22px;text-align:center}.leader-name{font-weight:900;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.leader-score{font-size:21px;font-weight:950;color:#3345c4}.tie-note{margin:12px 0;padding:11px 13px;border-radius:15px;background:#fff7df;border:1px solid #ead8a4;color:#6c531a;font-weight:850}.result-action-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px;margin-top:14px}.result-action-grid .wide{grid-column:1/-1}.danger-outline{background:#fff;color:#a13333;border:1px solid #e5bcbc}

@media(max-width:620px){.classroom-entry-inner{grid-template-columns:1fr;padding:17px}.classroom-entry .arena-launch{width:100%}.arena-setup-grid{grid-template-columns:1fr}.arena-setup-grid .field.full{grid-column:auto}.classroom-question-card{padding:15px 13px}.classroom-question{margin:18px 0 14px}.classroom-player-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.arena-control-row{grid-template-columns:1fr 1fr}.arena-control-row .end{grid-column:1/-1}.arena-match-head{align-items:start}.arena-results{padding:18px 14px}}
@media(max-width:390px){.classroom-answers{gap:8px}.classroom-answer{min-height:74px;padding:9px;grid-template-columns:30px minmax(0,1fr);gap:7px}.classroom-answer .answer-letter{width:30px;height:30px}.classroom-answer .answer-value{font-size:20px}.classroom-player-grid{grid-template-columns:1fr 1fr;gap:7px}.classroom-player-btn{min-height:54px;padding:8px}.classroom-player-btn .player-name{font-size:14px}.arena-progress-pill{padding:0 10px}.question-headline{align-items:flex-start}.arena-timer-track{width:62px}}

/* TC20 — Phòng thi đấu realtime, direct RTDB */
.competition-shell{max-width:1040px;padding-bottom:max(38px,env(safe-area-inset-bottom))}.competition-topbar{align-items:flex-start}.competition-topbar h1{margin:3px 0;font-size:clamp(28px,6vw,40px)}.competition-view{margin-top:8px}.competition-intro{text-align:center;padding:18px 8px 8px}.competition-badge{display:inline-flex;align-items:center;min-height:30px;padding:0 10px;border-radius:999px;background:#fff5da;border:1px solid #ecd9a7;color:#6e5316;font-size:11px;font-weight:950;letter-spacing:.1em}.competition-intro h2{margin:10px 0 5px;font-size:clamp(28px,7vw,40px);letter-spacing:-.04em}.competition-intro p{margin:0;color:#667085}.competition-choice-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin:18px 0}.competition-choice{min-height:160px;padding:20px;border:1.5px solid #dde3ef;border-radius:28px;background:#fff;display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:14px;align-items:center;text-align:left;box-shadow:0 14px 34px rgba(26,39,75,.08)}.competition-choice.host-choice{background:linear-gradient(135deg,#fff8dd,#fff 65%);border-color:#ead9a7}.competition-choice.join-choice{background:linear-gradient(135deg,#eef3ff,#fff 65%);border-color:#d4dcff}.competition-choice .choice-icon{display:grid;place-items:center;width:58px;height:58px;border-radius:20px;background:#fff;font-size:30px;box-shadow:0 8px 20px rgba(32,45,78,.08)}.competition-choice strong{display:block;font-size:24px;font-weight:950;letter-spacing:-.025em}.competition-choice small{display:block;margin-top:5px;color:#667085;font-size:13px;line-height:1.5}.competition-choice>b{font-size:28px;color:#6c76b9}.competition-choice:hover{transform:translateY(-2px);box-shadow:0 18px 40px rgba(26,39,75,.11)}.classroom-mode-link{display:flex;align-items:center;justify-content:center;min-height:48px;margin:5px auto 0;padding:0 14px;color:#596273;font-size:13px;font-weight:850;text-align:center}.competition-form-view{max-width:720px;margin:14px auto;padding:22px}.competition-form-view h2{margin:5px 0 18px;font-size:28px}.back-link-btn{border:0;background:transparent;padding:6px 0 14px;color:#5661ad;font-weight:900}.competition-form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.competition-form-grid .field{margin:0}.competition-form-grid .full{grid-column:1/-1}.competition-rule-strip{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;margin:16px 0}.competition-rule-strip span{padding:10px 12px;border-radius:14px;background:#f7f8fc;border:1px solid #e3e7ef;color:#596273;font-size:12px;font-weight:850}.host-room-bar{display:grid;grid-template-columns:minmax(150px,1fr) auto auto auto;gap:12px;align-items:center;padding:14px 16px;margin-bottom:14px}.host-room-bar>div:first-child{display:grid;gap:5px}.room-role-pill{display:inline-flex;width:max-content;align-items:center;min-height:28px;padding:0 9px;border-radius:999px;background:#f0eaff;color:#6847b9;font-size:11px;font-weight:950}.room-role-pill.player{background:#eaf3ff;color:#3761aa}.room-secret{display:grid;grid-template-columns:auto auto;gap:2px 7px;align-items:center;padding:7px 10px;border:1px solid #e2e6ef;border-radius:14px;background:#fbfcfe}.room-secret span{grid-column:1/-1;font-size:10px;color:#7b8495;font-weight:850}.room-secret strong{font-size:20px;letter-spacing:.04em}.room-secret button{border:0;background:transparent;font-size:16px}.danger-btn{min-height:44px;padding:0 13px;border:1px solid #e9bbbb;border-radius:14px;background:#fff4f4;color:#a12f2f;font-weight:900}.host-roster-card,.host-live-roster,.live-question-card{padding:18px}.host-player-list{display:grid;gap:7px;margin-top:12px}.empty-roster{padding:24px 14px;border:1px dashed #d7dde8;border-radius:17px;text-align:center;color:#7a8495}.host-player-row{display:grid;grid-template-columns:minmax(0,1fr) 80px minmax(140px,1fr) 38px;gap:8px;align-items:center;min-height:54px;padding:9px 10px;border:1px solid #e2e6ee;border-radius:16px;background:#fff}.host-player-name{font-weight:900;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.host-player-score{text-align:center;color:#3448c9}.host-player-latest{text-align:center;font-size:12px}.latest-answer{display:inline-flex;align-items:center;justify-content:center;min-height:30px;padding:0 9px;border-radius:999px;background:#eef8f1;color:#257147;font-weight:900}.latest-answer.pending{background:#f4f5f7;color:#7a8495}.ready-label{color:#258050;font-weight:900}.kick-player-btn{width:36px;height:36px;border-radius:11px;border:1px solid #e3e6ed;background:#f8f9fb;font-weight:950}.room-lock-note{margin:13px 0;padding:10px 12px;border-radius:14px;background:#fff7df;border:1px solid #ead9a7;color:#6d541a;font-size:12px;font-weight:850}.host-game-layout{display:grid;grid-template-columns:minmax(0,1fr) minmax(330px,.9fr);gap:14px}.live-question-top{display:flex;align-items:center;justify-content:space-between;gap:10px}.live-timer{display:inline-flex;align-items:center;justify-content:center;min-width:82px;min-height:42px;padding:0 12px;border-radius:14px;background:#fff1f1;border:1px solid #f1caca;color:#c62f2f;font-size:18px;font-weight:950}.live-question-text{margin:22px 0 16px;text-align:center;white-space:pre-line;font-size:clamp(30px,7vw,50px);line-height:1.2;font-weight:950;letter-spacing:-.035em}.live-answer-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.live-answer-option{min-height:76px;padding:11px 14px;border:1.5px solid #d9dfeb;border-radius:18px;background:#fff;display:grid;grid-template-columns:38px minmax(0,1fr);gap:10px;align-items:center;text-align:left}.live-answer-option>span{display:grid;place-items:center;width:36px;height:36px;border-radius:12px;background:#eef2ff;color:#4053ca;font-weight:950}.live-answer-option>b{font-size:clamp(19px,4.5vw,27px);overflow-wrap:anywhere}.live-answer-option:not(:disabled){cursor:pointer}.live-answer-option.selected{border-color:#5b72e8;background:#f3f5ff;box-shadow:0 0 0 2px #dfe4ff inset}.live-answer-option.correct{border-color:#68bd87;background:#effcf3}.live-answer-option.correct>span{background:#d9f3e2;color:#197745}.live-answer-option.wrong{border-color:#e29a9a;background:#fff2f2}.live-answer-option:disabled{opacity:1}.round-result-card{margin-top:14px;padding:13px;border-radius:18px;background:#f5fbf7;border:1px solid #cfe9d8}.result-answer{text-align:center;font-size:15px;color:#286d45}.round-result-list{display:grid;gap:6px;margin-top:11px}.round-row{display:grid;grid-template-columns:minmax(0,1fr) 120px 60px;gap:8px;align-items:center;padding:7px 9px;border-radius:11px;background:#fff}.round-row .positive{color:#18804b}.round-row .negative{color:#c13a3a}.host-table-head{display:grid;grid-template-columns:minmax(0,1fr) 80px minmax(140px,1fr) 38px;gap:8px;padding:0 10px;color:#7a8495;font-size:10px;font-weight:900;text-transform:uppercase}.competition-finished{text-align:center;padding:24px}.competition-finished h2{margin:5px 0 14px;font-size:30px}.player-room-top{display:flex;justify-content:space-between;align-items:center;gap:12px;margin:4px 0 12px}.player-room-top>div{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.player-wait-card{max-width:620px;margin:0 auto;text-align:center;padding:28px 18px}.wait-icon{font-size:52px}.player-wait-card h2{margin:8px 0 4px}.player-game-card{max-width:620px;margin:0 auto;padding:16px}.player-answer-grid .live-answer-option{min-height:68px}.confirm-answer-btn{width:100%;margin-top:12px;min-height:54px}.player-answer-status{margin-top:10px;padding:11px 12px;border-radius:15px;background:#f7f8fb;color:#596273;text-align:center;font-size:13px;font-weight:850;line-height:1.5}.player-answer-status.confirmed{background:#eefaf2;border:1px solid #c9e8d4;color:#277047}.player-answer-status.confirmed small{display:block;margin-top:4px;color:#6f7b75;font-weight:700}.player-answer-status.waiting-next{background:#fff8e5;border:1px solid #ecd9a5;color:#765718}.my-round-result{display:grid;gap:4px;margin-top:10px;padding:12px;border-radius:14px;background:#fff;text-align:center}.my-round-result>strong{font-size:25px}.my-round-result.good>strong{color:#18804b}.my-round-result.bad>strong{color:#c23b3b}.my-round-result.neutral>strong{color:#6f7785}.scoreboard-head{display:flex;justify-content:space-between;align-items:flex-end;gap:10px;margin:16px 2px 8px}.scoreboard-head small{color:#8a93a2;font-size:10px;text-align:right}.match-scoreboard{display:grid;gap:6px}.scoreboard-row{display:grid;grid-template-columns:32px minmax(0,1fr) auto;gap:8px;align-items:center;min-height:44px;padding:7px 10px;border:1px solid #e3e7ee;border-radius:13px;background:#fff}.scoreboard-row.me{border-color:#9dafef;background:#f4f6ff}.score-rank{display:grid;place-items:center;width:27px;height:27px;border-radius:9px;background:#f2f4f8;color:#596273;font-size:12px;font-weight:950}.score-name{font-weight:900;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.scoreboard-row strong{color:#3547bd;font-size:13px}.room-closed-view{max-width:560px;margin:40px auto;text-align:center;padding:30px 20px}.room-closed-view h2{margin:8px 0 5px}.room-closed-view p{margin:0 0 18px;color:#667085}
@media(max-width:800px){.host-room-bar{grid-template-columns:1fr 1fr}.host-room-bar>div:first-child{grid-column:1/-1}.host-room-bar .danger-btn{grid-column:1/-1}.host-game-layout{grid-template-columns:1fr}.host-table-head{display:none}.host-player-row{grid-template-columns:minmax(0,1fr) auto 38px;grid-template-areas:"name score kick" "latest latest latest"}.host-player-name{grid-area:name}.host-player-score{grid-area:score}.host-player-latest{grid-area:latest;text-align:left}.kick-player-btn{grid-area:kick}.host-live-roster{order:2}}
@media(max-width:620px){.competition-choice-grid{grid-template-columns:1fr}.competition-choice{min-height:132px;padding:16px;border-radius:22px}.competition-form-grid,.competition-rule-strip{grid-template-columns:1fr}.competition-form-grid .full{grid-column:auto}.host-room-bar{grid-template-columns:1fr 1fr;padding:12px}.room-secret strong{font-size:18px}.live-question-text{margin:18px 0 13px}.live-answer-grid{gap:8px}.live-answer-option{min-height:68px;padding:9px;grid-template-columns:34px minmax(0,1fr)}.live-answer-option>span{width:32px;height:32px}.round-row{grid-template-columns:minmax(0,1fr) 100px 54px}.competition-topbar{gap:8px}.competition-topbar .ghost-btn{padding:8px 10px;font-size:12px}}
@media(max-width:380px){.host-room-bar{grid-template-columns:1fr}.room-secret,.host-room-bar .danger-btn{grid-column:1/-1}.live-answer-grid{grid-template-columns:1fr 1fr}.live-answer-option>b{font-size:18px}.player-game-card{padding:13px 10px}.scoreboard-head small{display:none}}