:root{--ink:#0b0b0b;--paper:#f4f1e9;--paper2:#ebe7dc;--white:#fffdf8;--gold:#f9aa24;--line:#d5d0c5;--muted:#726e65;--danger:#b3261e;--success:#18794e;font-family:Arial,Helvetica,sans-serif}*{box-sizing:border-box}html,body{margin:0;min-height:100%;background:var(--ink)}body{color:var(--ink);-webkit-font-smoothing:antialiased}button,input,textarea,select{font:inherit}button{cursor:pointer}.is-hidden{display:none!important}.device-shell{width:100%;max-width:820px;min-height:100dvh;margin:0 auto;background:var(--paper);position:relative;overflow:hidden}.brand-header,.chat-header,.dashboard-header{display:flex;align-items:center;justify-content:space-between}.brand-header{padding:max(24px,env(safe-area-inset-top)) 22px 18px}.brand-logo{display:block;width:118px;height:auto}.demo-pill,.code-badge{border:1px solid rgba(11,11,11,.18);padding:7px 9px;font-size:10px;font-weight:800;letter-spacing:.12em}.demo-pill.inverse{color:var(--gold);border-color:rgba(249,170,36,.45)}.eyebrow{margin:0 0 12px;font-size:11px;line-height:1;letter-spacing:.16em;font-weight:800}.eyebrow.gold{color:var(--gold)}.access-hero{padding:44px 22px 28px}.access-hero h1,.login-copy h1,.dashboard-header h1{margin:0;font-size:clamp(46px,13vw,78px);line-height:.92;letter-spacing:-.055em;font-weight:800}.access-hero .lead{max-width:390px;margin:22px 0 0;font-size:17px;line-height:1.42;color:var(--muted)}.code-form{padding:22px;border-top:1px solid var(--line)}.field-label{display:block;margin-bottom:10px;font-size:12px;font-weight:800;letter-spacing:.06em;text-transform:uppercase}.field-label.light{color:var(--white)}.code-input,.text-input{width:100%;border:1px solid var(--ink);background:transparent;outline:none}.code-input{height:72px;padding:0 16px;font:800 28px/1 ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;letter-spacing:.14em;text-transform:uppercase;border-width:0 0 2px;border-radius:0}.code-input:focus{border-color:var(--gold);box-shadow:inset 0 -2px var(--gold)}.field-hint{margin:9px 0 22px;color:var(--muted);font-size:12px}.primary-btn{width:100%;min-height:58px;border:0;background:var(--gold);color:var(--ink);display:flex;align-items:center;justify-content:space-between;padding:0 18px;font-weight:800;font-size:15px}.dark-btn{background:var(--ink);color:var(--white)}.form-error{min-height:19px;color:var(--danger);font-size:13px;line-height:1.35;margin:12px 0 0}.access-footer{position:absolute;left:22px;right:22px;bottom:max(18px,env(safe-area-inset-bottom));font-size:11px;color:var(--muted)}
.student-shell{background:var(--white)}.chat-view{height:100dvh;display:grid;grid-template-rows:auto 1fr auto;background:var(--white)}.chat-header{padding:max(14px,env(safe-area-inset-top)) 14px 12px;border-bottom:1px solid var(--line);background:rgba(255,253,248,.96);z-index:2;gap:10px}.brand-lockup{display:flex;align-items:center;gap:10px;min-width:0}.chat-brand-logo{width:72px}.chat-heading{min-width:0}.chat-title{font-size:13px;font-weight:800;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:30vw}.chat-status{margin-top:4px;display:flex;align-items:center;gap:6px;color:var(--muted);font-size:11px}.status-dot{width:6px;height:6px;border-radius:50%;background:var(--success)}.chat-header-actions{display:flex;align-items:center;gap:6px}.code-badge{font-family:ui-monospace,monospace;font-size:10px;letter-spacing:.06em}.chat-exit-btn{height:34px;border:1px solid var(--ink);background:transparent;padding:0 10px;font-size:11px;font-weight:800}.messages{min-height:0;overflow-y:auto;overscroll-behavior:contain;padding:22px 14px 20px;scroll-behavior:smooth}.message-row{display:flex;margin:0 0 14px}.message-row.user{justify-content:flex-end}.message-bubble{max-width:88%;padding:13px 14px;font-size:15.5px;line-height:1.48;word-break:break-word}.message-row.assistant .message-bubble{background:var(--paper2);border-radius:2px 18px 18px 18px}.message-row.user .message-bubble{background:var(--ink);color:var(--white);border-radius:18px 2px 18px 18px}.message-row.user .message-content{white-space:pre-wrap}.message-meta{font-size:10px;margin-top:6px;opacity:.55}.message-content.markdown>:first-child{margin-top:0}.message-content.markdown>:last-child{margin-bottom:0}.message-content.markdown p{margin:0 0 10px}.message-content.markdown h2,.message-content.markdown h3,.message-content.markdown h4,.message-content.markdown h5{margin:14px 0 7px;line-height:1.2}.message-content.markdown h2{font-size:20px}.message-content.markdown h3{font-size:18px}.message-content.markdown h4,.message-content.markdown h5{font-size:16px}.message-content.markdown ul,.message-content.markdown ol{margin:7px 0 11px;padding-left:22px}.message-content.markdown li{margin:4px 0}.message-content.markdown blockquote{margin:9px 0;padding:8px 10px;border-left:3px solid var(--gold);background:rgba(255,255,255,.48);color:#4d4942}.message-content.markdown code{font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;font-size:.9em;background:rgba(11,11,11,.08);padding:1px 4px;border-radius:4px}.message-content.markdown pre{margin:9px 0 11px;padding:11px 12px;overflow-x:auto;background:var(--ink);color:var(--white);border-radius:8px}.message-content.markdown pre code{display:block;min-width:max-content;padding:0;background:transparent;color:inherit;white-space:pre;font-size:12.5px;line-height:1.5}.message-content.markdown a{color:inherit;font-weight:700}.typing{display:inline-flex;gap:4px;align-items:center;height:18px}.typing i{width:5px;height:5px;border-radius:50%;background:var(--muted);animation:blink 1.2s infinite}.typing i:nth-child(2){animation-delay:.16s}.typing i:nth-child(3){animation-delay:.32s}@keyframes blink{0%,80%,100%{opacity:.25}40%{opacity:1;transform:translateY(-2px)}}.composer{position:relative;display:grid;grid-template-columns:1fr 48px;gap:8px;align-items:end;padding:10px 12px max(10px,env(safe-area-inset-bottom));border-top:1px solid var(--line);background:var(--white);z-index:2}.composer textarea{resize:none;max-height:160px;min-height:48px;border:1px solid var(--line);border-radius:18px;background:var(--white);outline:none;padding:13px 14px;line-height:1.35}.composer button{width:48px;height:48px;border-radius:50%;border:0;background:var(--gold);color:var(--ink);font-size:24px;font-weight:700}.completion-card{position:relative;z-index:2;background:var(--gold);padding:16px 18px max(16px,env(safe-area-inset-bottom));display:grid;grid-template-columns:44px 1fr;gap:13px;align-items:center;border-top:1px solid rgba(11,11,11,.18);box-shadow:none}.completion-icon{width:44px;height:44px;border-radius:50%;background:var(--ink);color:var(--gold);display:grid;place-items:center;font-size:20px;font-weight:900}.completion-card h2{margin:0 0 6px;font-size:24px}.completion-card p:last-child{margin:0;font-size:13px}.completion-card .eyebrow{margin-bottom:7px}
.trainer-login{min-height:100dvh;background:var(--ink);color:var(--white);position:relative}.dark-header{background:var(--ink)}.login-copy{padding:52px 22px 26px}.login-copy p:last-child{color:#aaa79f;line-height:1.5;font-size:16px;max-width:460px}.login-form{padding:26px 22px max(28px,env(safe-area-inset-bottom));position:absolute;left:0;right:0;bottom:0;border-top:1px solid #31312f}.text-input{height:56px;padding:0 14px;margin-bottom:16px}.dark-input{color:var(--white);border-color:#4a4945;background:#161616}.light-error{color:#ff9a94}.dashboard{min-height:100dvh;padding-bottom:max(32px,env(safe-area-inset-bottom))}.dashboard-header{background:var(--ink);color:var(--white);padding:max(28px,env(safe-area-inset-top)) 22px 26px;align-items:flex-end}.dashboard-header h1{font-size:clamp(42px,10vw,70px)}.icon-btn{width:44px;height:44px;border:1px solid #4b4a46;color:var(--white);background:transparent;font-size:20px}.create-panel{background:var(--gold);padding:21px 22px 22px}.section-kicker{font-size:10px;font-weight:900;letter-spacing:.14em;margin-bottom:14px}.counter-row{display:flex;align-items:flex-end;justify-content:space-between}.counter-value{font-size:66px;line-height:.9;font-weight:800;letter-spacing:-.06em}.counter-label{margin-top:8px;font-size:13px}.stepper{display:flex;gap:7px}.stepper button{width:44px;height:44px;border:1px solid rgba(11,11,11,.65);background:transparent;font-size:25px}.create-panel input[type=range]{width:100%;margin:25px 0 22px;accent-color:var(--ink)}.stats-grid{display:grid;grid-template-columns:repeat(2,1fr);border-top:1px solid var(--line);border-left:1px solid var(--line)}.stat-card{min-height:118px;border-right:1px solid var(--line);border-bottom:1px solid var(--line);padding:14px;display:flex;flex-direction:column;justify-content:space-between}.stat-card span{color:var(--muted);font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.08em}.stat-card strong{font-size:36px;letter-spacing:-.05em}.gold-card{background:var(--gold)}.gold-card span{color:var(--ink)}.batch-section{padding:26px 16px 32px}.section-head{display:flex;justify-content:space-between;align-items:flex-end;gap:16px}.section-head h2{margin:0;font-size:29px;letter-spacing:-.045em}.section-actions{display:flex;gap:12px;flex-wrap:wrap;justify-content:flex-end}.text-btn{border:0;border-bottom:1px solid var(--ink);background:transparent;padding:0 0 3px;font-size:12px;font-weight:700}.text-btn:disabled{opacity:.35}.batch-select{width:100%;margin:18px 0 8px;height:45px;border:1px solid var(--line);border-radius:0;background:var(--white);padding:0 11px}.mode-note{color:var(--muted);font-size:11px;margin:8px 0 14px;word-break:break-word}.participants-list{border-top:1px solid var(--ink)}.participant-row{display:grid;grid-template-columns:minmax(95px,.9fr) 1.2fr auto;gap:10px;align-items:center;min-height:78px;border-bottom:1px solid var(--line)}.participant-code{font:800 18px/1 ui-monospace,monospace;letter-spacing:.08em}.participant-status{font-size:12px;font-weight:800;margin-bottom:5px}.participant-detail{color:var(--muted);font-size:11px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.row-actions{display:flex;gap:5px}.mini-btn{width:36px;height:36px;border:1px solid var(--line);background:var(--white);font-size:15px}.status-new{color:var(--muted)}.status-active{color:#9b6b00}.status-done{color:var(--success)}.empty-state{padding:30px 2px;color:var(--muted);line-height:1.5}.modal-open{overflow:hidden}.codes-modal{position:fixed;z-index:50;inset:0;width:100%;max-width:820px;margin:0 auto;background:rgba(11,11,11,.55)}.codes-modal-panel{height:100dvh;background:var(--paper);display:grid;grid-template-rows:auto auto minmax(0,1fr) auto}.codes-modal-header{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;padding:max(24px,env(safe-area-inset-top)) 18px 18px;background:var(--ink);color:var(--white)}.codes-modal-header .section-kicker{color:var(--gold);margin-bottom:9px}.codes-modal-header h2{margin:0;font-size:34px}.modal-close-btn{width:44px;height:44px;border:1px solid #4b4a46;background:transparent;color:var(--white);font-size:28px}.codes-modal-meta{margin:0;padding:14px 18px;border-bottom:1px solid var(--line);color:var(--muted);font-size:12px}.codes-grid{min-height:0;overflow-y:auto;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));align-content:start;gap:8px;padding:12px 12px 20px}.code-tile{min-width:0;min-height:92px;text-align:left;border:1px solid var(--line);background:var(--white);padding:11px;display:flex;flex-direction:column;justify-content:space-between}.code-tile.is-copied{border-color:var(--ink);background:var(--gold)}.code-index{font-size:9px;color:var(--muted);font-weight:800;letter-spacing:.12em}.code-tile strong{font:800 18px/1 ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;letter-spacing:.08em}.code-copy-state{font-size:9px;color:var(--muted)}.codes-modal-footer{padding:10px 12px max(10px,env(safe-area-inset-bottom));border-top:1px solid var(--line);background:var(--paper)}
@media(min-width:600px){.codes-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}@media(min-width:900px){body{padding:20px 0}.device-shell{min-height:calc(100dvh - 40px);max-height:calc(100dvh - 40px);border-radius:18px}.chat-view,.trainer-login{height:calc(100dvh - 40px);min-height:calc(100dvh - 40px)}.codes-modal{top:20px;bottom:20px;height:calc(100dvh - 40px);border-radius:18px;overflow:hidden}.codes-modal-panel{height:calc(100dvh - 40px)}}@media(max-width:380px){.access-hero h1,.login-copy h1{font-size:44px}.participant-row{grid-template-columns:95px 1fr auto}.participant-code{font-size:16px}.chat-brand-logo{width:62px}.chat-title{max-width:25vw;font-size:12px}.code-badge{padding:7px 5px;font-size:8px}.chat-exit-btn{padding:0 7px}.section-actions{gap:8px}}
/* Trainer ranking */
.ranking-section{padding:26px 16px 24px;border-bottom:1px solid var(--line);background:var(--white)}
.ranking-head{align-items:flex-end}.ranking-note{max-width:120px;text-align:right;color:var(--muted);font-size:10px;line-height:1.35}
.ranking-table-wrap{margin-top:18px;border-top:1px solid var(--ink);overflow-x:auto;-webkit-overflow-scrolling:touch}
.ranking-table{width:100%;border-collapse:collapse;table-layout:fixed;font-size:12px}
.ranking-table th{padding:9px 6px;text-align:left;color:var(--muted);font-size:9px;letter-spacing:.08em;text-transform:uppercase;border-bottom:1px solid var(--line)}
.ranking-table td{padding:11px 6px;border-bottom:1px solid var(--line);vertical-align:middle}
.ranking-table th:nth-child(1),.ranking-table td:nth-child(1){width:30px;text-align:center}.ranking-table th:nth-child(2),.ranking-table td:nth-child(2){width:92px}.ranking-table th:nth-child(3),.ranking-table td:nth-child(3){width:70px}.ranking-table th:nth-child(4),.ranking-table td:nth-child(4){width:48px;text-align:center}.ranking-table th:nth-child(5),.ranking-table td:nth-child(5){width:66px;text-align:right}
.rank-place{font-weight:900}.ranking-code{font:800 12px/1 ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;letter-spacing:.05em}.ranking-table tr.rank-1{background:rgba(249,170,36,.2)}.ranking-table tr.rank-1 .rank-place{font-size:17px}.ranking-dialog-btn{border:0;border-bottom:1px solid var(--ink);background:transparent;padding:2px 0;font-size:10px;font-weight:800}.ranking-empty{padding:22px 4px;color:var(--muted);font-size:12px;line-height:1.45}.mini-btn:disabled{opacity:.25;cursor:default}
/* Trainer dialog viewer */
.dialog-modal{position:fixed;z-index:55;inset:0;width:100%;max-width:820px;margin:0 auto;background:rgba(11,11,11,.55)}
.dialog-modal-panel{height:100dvh;background:var(--paper);display:grid;grid-template-rows:auto auto minmax(0,1fr)}
.dialog-modal-header{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;padding:max(24px,env(safe-area-inset-top)) 18px 18px;background:var(--ink);color:var(--white)}
.dialog-modal-header .section-kicker{color:var(--gold);margin-bottom:9px}.dialog-modal-header h2{margin:0;font-size:30px;letter-spacing:-.04em}
.dialog-summary{display:grid;grid-template-columns:repeat(3,1fr);border-bottom:1px solid var(--line);background:var(--white)}
.dialog-summary>div{min-width:0;padding:11px 10px;border-right:1px solid var(--line)}.dialog-summary>div:last-child{border-right:0}.dialog-summary span{display:block;color:var(--muted);font-size:9px;text-transform:uppercase;letter-spacing:.08em;margin-bottom:5px}.dialog-summary strong{display:block;font-size:12px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.trainer-dialog-messages{min-height:0;overflow-y:auto;padding:18px 12px max(24px,env(safe-area-inset-bottom));overscroll-behavior:contain;background:var(--paper)}
.dialog-loading{padding:24px 4px;color:var(--muted);font-size:13px;text-align:center}
.trainer-dialog-row{margin:0 0 16px}.trainer-dialog-label{margin:0 0 5px;font-size:9px;font-weight:900;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
.trainer-dialog-row.user .trainer-dialog-label{text-align:right}.trainer-dialog-bubble{max-width:90%;padding:12px 13px;font-size:14px;line-height:1.45;word-break:break-word}.trainer-dialog-row.assistant .trainer-dialog-bubble{background:var(--white);border:1px solid var(--line);border-radius:2px 16px 16px 16px}.trainer-dialog-row.user .trainer-dialog-bubble{margin-left:auto;background:var(--ink);color:var(--white);border-radius:16px 2px 16px 16px}.trainer-dialog-bubble .plain-text{white-space:pre-wrap}.trainer-dialog-time{margin-top:7px;font-size:9px;opacity:.5}
@media(min-width:900px){.dialog-modal{top:20px;bottom:20px;height:calc(100dvh - 40px);border-radius:18px;overflow:hidden}.dialog-modal-panel{height:calc(100dvh - 40px)}}
@media(max-width:380px){.ranking-section{padding-left:12px;padding-right:12px}.ranking-table{font-size:11px}.ranking-table th,.ranking-table td{padding-left:4px;padding-right:4px}.ranking-table th:nth-child(2),.ranking-table td:nth-child(2){width:82px}.ranking-table th:nth-child(5),.ranking-table td:nth-child(5){width:58px}.ranking-dialog-btn{font-size:9px}.dialog-summary strong{font-size:11px}}
.retry-card{position:relative;z-index:2;border-top:1px solid var(--line);background:var(--paper);padding:14px 12px max(14px,env(safe-area-inset-bottom));display:grid;grid-template-columns:1fr auto;gap:12px;align-items:center}.retry-card .eyebrow{margin-bottom:6px}.retry-card strong{display:block;font-size:15px;margin-bottom:4px}.retry-card p:last-child{margin:0;color:var(--muted);font-size:12px;line-height:1.4}.retry-card button{min-width:94px;height:42px;border:0;background:var(--gold);font-weight:800;padding:0 12px}.retry-card button:disabled{opacity:.55}
.dialog-modal-panel{grid-template-rows:auto auto auto minmax(0,1fr)}
.judge-diagnostics{padding:10px 12px;border-bottom:1px solid var(--line);background:#fff8dd;font-size:11px;line-height:1.45}.judge-diagnostics summary{cursor:pointer;font-weight:900;letter-spacing:.03em}.judge-diagnostics-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px 12px;margin-top:9px}.judge-check{display:flex;justify-content:space-between;gap:8px}.judge-check span:first-child{color:var(--muted)}.judge-ok{color:var(--success);font-weight:800}.judge-fail{color:#9b2c2c;font-weight:800}.judge-meta{margin-top:8px;color:var(--muted);word-break:break-word}.judge-error{margin-top:7px;color:#9b2c2c;word-break:break-word}


/* v11.2 trainer batch navigation */
.batch-picker-section{padding:24px 16px 18px;border-bottom:1px solid var(--line);background:var(--paper)}
.batch-picker-section .section-head{align-items:flex-end}.batch-picker-section .section-head h2{margin:0;font-size:29px;letter-spacing:-.045em}.batch-picker-section .batch-select{margin:14px 0 8px}.batch-picker-section .mode-note{margin-bottom:0}.batch-section{background:var(--paper)}.ranking-section{border-top:1px solid var(--line);border-bottom:0}.batch-section+.ranking-section{margin-top:0}
@media(max-width:380px){.batch-picker-section{padding-left:12px;padding-right:12px}.batch-picker-section .section-head h2{font-size:26px}}