:root{--primary: #315c4e;--primary-soft: #e8f0eb;--background: #f4f6f1;--surface: #ffffff;--ink: #233c34;--muted: #586b63;--border: #dbe3da;--wood: #e9b078;--fixed: #b45232;--variable: #315c4e;--sunshine: #f6dc80;--danger: #a43838;--font-display: YouYuan, "Microsoft YaHei", "PingFang SC", sans-serif;--font-sans: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", sans-serif;--font-mono: Consolas, SFMono-Regular, monospace;--radius: 16px;--radius-sm: 10px;--radius-lg: 24px;--section-gap: 28px;--page-max: 1240px;--scrollbar-thumb: var(--muted);--scrollbar-track: var(--background);font-family:var(--font-sans);color:var(--ink);background:var(--background);font-synthesis:none;text-rendering:optimizeLegibility;font-size:16px;line-height:1.7;scrollbar-color:var(--scrollbar-thumb) var(--scrollbar-track);scrollbar-width:thin;scrollbar-gutter:stable}*{box-sizing:border-box;scrollbar-color:var(--scrollbar-thumb) var(--scrollbar-track);scrollbar-width:thin}*::-webkit-scrollbar{width:9px;height:9px}*::-webkit-scrollbar-thumb{background:var(--scrollbar-thumb);border:2px solid var(--scrollbar-track);border-radius:var(--radius-sm)}*::-webkit-scrollbar-track{background:var(--scrollbar-track)}*::-webkit-scrollbar-thumb:hover{background:var(--primary)}*::-webkit-scrollbar-thumb:active{background:var(--ink)}@media(forced-colors:active){*{scrollbar-color:auto}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation-duration:.01ms!important;transition-duration:.01ms!important;scroll-behavior:auto!important}}body{margin:0;min-width:320px}button,input,textarea,select{font:inherit}button,a,input,textarea,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.55}a{color:inherit;text-decoration:none}h1,h2,h3,p{margin-top:0}h1,h2,h3{line-height:1.4}h1{font-family:var(--font-display);font-size:36px;letter-spacing:-.025em}h2{font-size:22px;margin-bottom:12px}h3{font-size:18px;margin-bottom:9px}p{color:var(--muted);margin-bottom:18px}small{font-size:12px}strong{font-weight:700}svg{flex-shrink:0}:focus-visible{outline:3px solid var(--fixed);outline-offset:4px}input:focus-visible,textarea:focus-visible,select:focus-visible{outline:3px solid var(--primary);outline-offset:2px}::selection{background:var(--sunshine);color:var(--ink)}.sr-only{position:absolute;left:0;top:0;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.page{width:min(var(--page-max),calc(100% - 72px));margin:0 auto}.site-header{min-height:100px;display:flex;align-items:center;justify-content:space-between;gap:20px;border-bottom:1px solid var(--border)}.brand{display:flex;gap:12px;align-items:center;font-size:20px;font-weight:700;flex-shrink:0}.brand small{display:block;font-weight:400;color:var(--muted);font-size:11px;letter-spacing:.05em;margin-top:1px}.brand-symbol{width:43px;height:43px;display:grid;place-items:center;background:var(--primary);color:var(--surface);border-radius:14px}.header-actions{display:flex;align-items:center;justify-content:flex-end;gap:18px;flex-wrap:wrap}.header-subject,.header-link{font-size:13px;color:var(--muted)}.header-link:hover{color:var(--primary);text-decoration:underline}.eyebrow{font-size:12px;font-weight:700;letter-spacing:.09em;color:var(--primary);display:inline-flex;align-items:center;gap:10px}.tiny-line{height:2px;width:25px;background:currentColor;display:inline-block}.button{min-height:46px;border-radius:var(--radius-sm);padding:10px 17px;border:1px solid transparent;display:inline-flex;justify-content:center;align-items:center;gap:8px;font-size:14px;font-weight:600;line-height:1.5;text-align:center;transition:background .18s,transform .18s,border-color .18s;white-space:nowrap}.button:not(:disabled):active{transform:translateY(1px)}.button-primary{background:var(--primary);color:var(--surface)}.button-primary:not(:disabled):hover{background:var(--ink)}.button-secondary{background:var(--surface);color:var(--primary);border-color:var(--border)}.button-secondary:not(:disabled):hover{background:var(--primary-soft);border-color:var(--primary)}.button-ghost{color:var(--muted);background:transparent}.button-ghost:not(:disabled):hover{background:var(--primary-soft);color:var(--primary)}.button-danger{background:var(--danger);color:var(--surface)}.button-danger:not(:disabled):hover{filter:brightness(.92)}.button-row{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.full-width{width:100%}.text-button,.icon-button{border:0;background:transparent;color:var(--primary);display:inline-flex;align-items:center;justify-content:center;gap:5px;border-radius:6px;min-height:38px;padding:5px 8px;font-size:12px}.text-button:not(:disabled):hover,.icon-button:hover{background:var(--primary-soft)}.icon-button{width:40px;height:40px;padding:5px}.text-link{color:var(--primary);font-size:13px;display:inline-block;text-decoration:underline;text-underline-offset:4px}.panel{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:24px}.feedback{border:1px solid var(--border);background:var(--primary-soft);color:var(--primary);border-radius:var(--radius-sm);padding:13px 16px;font-size:14px;line-height:1.7;margin:14px 0;overflow-wrap:anywhere}.feedback-error{color:var(--danger);background:#fbefed;border-color:#edd0cc}.feedback-warning{color:#735516;background:#fff8de;border-color:#eaddae}.feedback-success{color:var(--primary);background:var(--primary-soft)}.feedback .button{min-height:32px;padding:4px 9px;margin-left:9px}.field{display:flex;flex-direction:column;gap:7px;margin-bottom:19px;min-width:0}.field label{font-size:13px;font-weight:600}.field input,.field select,.field textarea{width:100%;min-height:48px;border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--surface);color:var(--ink);padding:11px 13px;line-height:1.5}.field input::placeholder,.field textarea::placeholder{color:#66776e;font-size:14px}.field input[aria-invalid=true]{border-color:var(--danger)}.field textarea{resize:none;min-height:100px}.field-help,.field-error{font-size:12px;line-height:1.6}.field-help{color:var(--muted)}.field-error{color:var(--danger)}.secret-input{position:relative}.secret-input input{padding-right:48px}.secret-input .icon-button{position:absolute;right:5px;top:4px}.connection{display:inline-flex;align-items:center;gap:6px;font-size:12px;color:var(--muted);white-space:nowrap}.connection-live{color:var(--primary)}.connection-offline,.connection-expired{color:var(--danger)}.loading{min-height:300px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px}.loading p{margin:0}.spin{animation:spin 1.2s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.dialog{width:min(620px,calc(100vw - 32px));max-height:calc(100dvh - 44px);overflow-y:auto;border:1px solid var(--border);border-radius:var(--radius-lg);color:var(--ink);padding:28px;box-shadow:0 24px 80px #182f2940}.dialog::backdrop{background:#16312b80}.dialog-title{display:flex;justify-content:space-between;align-items:flex-start;gap:20px;margin-bottom:14px}.dialog-title h2{margin:0}.dialog-title .button{padding:0;min-height:32px;width:32px}.dialog>.button-row{justify-content:flex-end;margin-top:24px}.error-page{max-width:700px;margin:70px auto;padding:40px}.error-page .button-row{margin-top:25px}.error-page h1{margin:14px 0}.home-hero{display:grid;grid-template-columns:.9fr 1.1fr;align-items:center;gap:70px;padding:57px 0 51px}.hero-copy h1{font-size:clamp(38px,4.1vw,58px);line-height:1.3;margin:23px 0;letter-spacing:-.04em}.hero-copy h1 span{position:relative;white-space:nowrap;color:var(--primary)}.hero-copy h1 span:after{content:"";position:absolute;height:7px;width:100%;left:0;bottom:-8px;background:var(--sunshine);border-radius:50%;transform:rotate(-2deg)}.hero-copy p{font-size:16px;line-height:1.9;margin:28px 0}.hero-copy .button{padding:15px 22px;min-height:54px}.hero-caption{display:flex;align-items:center;gap:8px;color:var(--muted);font-size:12px;margin-top:26px}.hero-experiment{position:relative;min-width:0;padding:20px;border:1px solid var(--border);background:#e8eee6;border-radius:30px}.experiment-heading{display:flex;align-items:center;justify-content:space-between;gap:12px;font-size:11px;color:var(--muted);margin-bottom:16px}.experiment-tag{color:var(--primary);font-size:12px;font-weight:700}.hero-experiment .table-lab{box-shadow:0 7px 20px #324d3510}.home-observation{display:flex;align-items:center;gap:14px;padding:20px 10px 0}.observation-letter{font-family:var(--font-mono);font-size:28px;display:grid;place-items:center;background:var(--sunshine);width:52px;height:52px;border-radius:50%;transform:rotate(-7deg)}.home-observation p{margin:0;font-size:12px}.home-observation strong{color:var(--ink)}.entry-section{padding:25px 0 40px}.entry-heading{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:20px}.entry-heading h2{font-size:18px;margin:0}.entry-heading>span{font-size:12px;color:var(--muted)}.entry-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:17px}.entry-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:23px;transition:border-color .18s,transform .18s}.entry-card:hover{border-color:var(--primary);transform:translateY(-3px)}.entry-icon{display:grid;place-items:center;width:49px;height:49px;border-radius:15px;margin-bottom:18px;color:var(--primary);background:var(--primary-soft)}.teacher-icon{color:#705719;background:#f8edc4}.board-icon{color:#456077;background:#e5edf3}.demo-icon{color:#88513a;background:#f6e7dc}.entry-card h3{font-size:17px}.entry-card p{font-size:12px;line-height:1.9;margin:10px 0 22px}.entry-link{display:flex;align-items:center;gap:8px;font-size:12px;color:var(--primary);font-weight:700}.site-footer{border-top:1px solid var(--border);padding:22px 0;display:flex;justify-content:space-between;gap:20px;color:var(--muted);font-size:11px}.table-lab{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;min-width:0;margin-bottom:24px}.lab-toolbar{padding:18px 22px;display:flex;justify-content:space-between;align-items:center;gap:12px;border-bottom:1px solid var(--border)}.segmented{background:var(--background);display:inline-flex;padding:3px;border-radius:var(--radius-sm)}.segmented button{padding:6px 11px;font-size:12px;background:transparent;border:1px solid transparent;border-radius:7px;color:var(--muted)}.segmented button[aria-pressed=true]{background:var(--surface);border-color:var(--border);color:var(--ink)}.lab-viewport{overflow-x:auto;padding:10px 0 20px;background-color:#f8faf6;background-image:radial-gradient(#d8e2d5 .8px,transparent .8px);background-size:17px 17px}.table-scene{position:relative;height:242px;margin:0 auto}.table-piece{position:absolute;top:75px;width:100px;height:68px;border:1.5px solid #ae7542;background:var(--wood);box-shadow:inset 0 0 0 4px #f4c893;display:grid;place-items:center;color:#6c4a2b}.table-piece:first-child{border-radius:5px 0 0 5px}.table-piece span{font-size:13px;opacity:.8}.seat{position:absolute;width:44px;height:44px;padding:5px;border:0;background:transparent;border-radius:50%;transform:translate(-50%,-50%);display:grid;place-items:center}.seat span{width:29px;height:29px;border-radius:50%;border:2px solid var(--primary);background:#dae7dc;display:grid;place-items:center;color:var(--surface);transition:background .18s}.seat:hover span{background:#b7d1be}.seat-counted span{background:var(--primary)}.seat-counted:hover span{background:var(--ink)}.seat-fixed span{border-color:var(--fixed);background:#f4dccd}.seat-fixed.seat-counted span{background:var(--fixed)}.table-brace{position:absolute;top:211px;height:14px;border:solid #a5b6a6;border-width:0 1px 1px;text-align:center;border-radius:0 0 4px 4px}.table-brace span{font-family:var(--font-mono);background:#f8faf6;padding:0 10px;position:relative;top:1px;font-size:13px}.lab-instruction{display:flex;flex-wrap:wrap;gap:10px;padding:9px 20px;align-items:center;font-size:11px;color:var(--muted);border-top:1px solid var(--border)}.lab-instruction>span{display:inline-flex;align-items:center;gap:7px;flex:1}.lab-instruction strong{font-size:12px;color:var(--primary);white-space:nowrap}.dot{display:inline-block;width:9px;height:9px;border-radius:50%;flex-shrink:0}.dot-green{background:var(--primary)}.dot-fixed{background:var(--fixed)}.dot-muted{background:#b2c2b5}.lab-controls{display:flex;align-items:center;justify-content:center;gap:22px;padding:15px 22px}.lab-controls>.button{width:46px;padding:10px}.range-field{flex:1;max-width:320px}.range-field label{display:flex;align-items:center;justify-content:space-between;font-size:12px;margin-bottom:4px}.range-field strong{font-family:var(--font-mono);font-size:18px}.range-field input{accent-color:var(--primary);width:100%;height:22px;cursor:pointer;margin:0}.legend-toggle{padding:12px 20px;width:100%;border:0;border-top:1px solid var(--border);background:var(--surface);display:flex;justify-content:space-between;align-items:center;gap:10px;color:var(--primary);font-size:11px}.legend{display:inline-flex;align-items:center;gap:7px;color:var(--muted)}.legend .dot:nth-of-type(2){margin-left:10px}.legend-toggle:hover,.legend-toggle.is-on{background:var(--primary-soft)}.table-lab-compact{margin-bottom:0}.table-lab-compact .lab-toolbar{padding:13px 17px}.table-lab-compact .table-scene{transform:scale(.89);transform-origin:center}.table-lab-compact .lab-viewport{padding:0}.table-lab-compact .lab-instruction{padding:7px 14px}.table-lab-compact .lab-controls{padding:12px 17px}.table-lab-compact .legend-toggle{padding:11px 16px}.seam-marker{position:absolute;top:95px;transform:translate(-50%);color:var(--danger);background:var(--surface);font-size:11px;border:1px dashed var(--danger);z-index:1;border-radius:5px;padding:1px 4px}.count-success{background:var(--primary-soft);color:var(--primary);padding:8px 20px;font-size:12px}.formula-strip{border-top:1px solid var(--border);padding:17px 22px;background:var(--primary-soft);display:flex;flex-direction:column;gap:7px}.formula-strip>span{font-size:11px;color:var(--muted)}.formula-strip strong{font-family:var(--font-mono);font-size:24px;overflow-wrap:anywhere}.formula-strip small{line-height:1.8;color:var(--muted)}.model-picker{display:flex;flex-wrap:wrap;gap:7px;padding:13px 20px;border-top:1px solid var(--border)}.model-picker button{border:1px solid var(--border);background:var(--surface);color:var(--muted);padding:7px 10px;border-radius:8px;font-size:12px}.model-picker button[aria-pressed=true]{background:var(--primary);color:var(--surface)}.join-layout{max-width:920px;margin:65px auto;display:grid;grid-template-columns:1fr 1fr;gap:95px;align-items:center}.join-intro>.eyebrow{display:block}.join-intro h1{margin:20px 0;font-size:42px}.join-intro p{font-size:16px;line-height:1.9}.join-mini-diagram{display:flex;align-items:center;gap:5px;margin:28px 0}.join-mini-diagram i{display:block;width:13px;height:13px;background:var(--primary-soft);border:1px solid var(--primary);border-radius:50%}.join-mini-diagram>span:not(.mini-table){margin:0 16px}.mini-table{display:inline-block;width:60px;height:36px;background:var(--wood);border:1px solid #ae7542;border-radius:4px}.join-form{padding:32px}.join-form>p{font-size:13px}.join-form .text-link{display:block;text-align:center;margin-top:20px}.field .code-input{font-family:var(--font-mono);font-size:26px;letter-spacing:.16em;min-height:60px}.auth-layout{max-width:480px;margin:60px auto;padding:36px}.auth-layout h1{font-size:28px;margin:12px 0}.auth-layout>p{font-size:14px}.auth-layout>.text-link{margin-top:23px}.auth-layout .eyebrow{font-size:11px;letter-spacing:.01em}.student-main{max-width:900px;margin:24px auto 60px}.student-name{font-size:14px;font-weight:600}.sharing-choice{display:flex;gap:8px;margin-bottom:18px}.sharing-choice button{display:inline-flex;align-items:center;gap:7px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--muted);padding:10px 12px;font-size:12px}.sharing-choice button[aria-pressed=true]{background:var(--primary-soft);border-color:var(--primary);color:var(--primary)}.partner-fields{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}.partner-fields .field input{font-size:13px;padding:10px}.shared-device{margin-bottom:22px}.shared-device-heading{display:flex;justify-content:space-between;align-items:center;gap:15px}.shared-device h2{font-size:19px;margin:6px 0}.shared-device h2 strong{color:var(--primary)}.shared-device>p{font-size:12px;margin:6px 0 17px}.profile-picker{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:9px}.profile-picker button{display:flex;align-items:center;gap:9px;min-width:0;text-align:left;padding:11px 9px;border:1px solid var(--border);background:var(--surface);border-radius:var(--radius-sm);color:var(--muted);position:relative}.profile-picker button[aria-pressed=true]{background:var(--primary-soft);border-color:var(--primary);color:var(--primary)}.profile-avatar{width:28px;height:28px;display:grid;place-items:center;border-radius:50%;background:var(--background);color:var(--primary);font-family:var(--font-mono);flex-shrink:0}.profile-picker strong{display:block;font-size:13px;overflow-wrap:anywhere}.profile-picker small{display:block;font-size:9px;margin-top:3px}.active-profile-tag{font-size:8px;position:absolute;right:5px;top:3px}.shared-hint{display:block;color:var(--muted);font-size:10px;margin-top:13px}.rotation-prompt{display:flex;align-items:center;justify-content:space-between;gap:12px;font-size:12px;margin-top:15px;padding-top:12px;border-top:1px solid var(--border)}.rotation-prompt .button{min-height:37px;font-size:11px;padding:8px 10px}.device-table-label{display:block;color:var(--muted);font-size:9px}@media(max-width:600px){.partner-fields{grid-template-columns:1fr;gap:0}.shared-device{padding:18px}.shared-device h2{font-size:17px}.shared-device-heading .button{font-size:10px;padding:7px}.profile-picker{grid-template-columns:repeat(2,minmax(0,1fr))}.profile-picker button{padding:13px 9px}.profile-picker small{font-size:8px}.rotation-prompt{align-items:flex-start;flex-direction:column}.shared-hint{font-size:9px}}.student-journey{display:flex;align-items:center;gap:16px;font-size:11px;color:var(--muted);padding:0 0 20px}.journey-dots{display:flex;gap:6px;flex:1}.journey-dots span{width:21px;height:5px;border-radius:4px;background:var(--border)}.journey-dots span.is-done{background:var(--primary)}.personal-stars{display:flex;align-items:center;gap:6px;color:#735516}.personal-stars svg{fill:var(--sunshine)}.paused-banner,.active-banner{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--primary);margin-bottom:20px;padding:11px 15px;background:var(--primary-soft);border:1px solid var(--border);border-radius:var(--radius-sm)}.paused-banner{background:#fff8de;color:#735516;border-color:#eaddae}.live-dot{display:inline-block;background:var(--primary);width:7px;height:7px;border-radius:50%;box-shadow:0 0 0 4px #315c4e15}.activity-intro{margin:26px 0}.activity-intro h1{margin:9px 0 10px}.activity-intro p{margin-bottom:0;font-size:15px}.method-picker{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-bottom:20px}.method-picker button{border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--surface);padding:13px 14px;color:var(--muted);text-align:left;position:relative}.method-picker button>span{display:block;font-size:14px;font-weight:700;color:var(--ink)}.method-picker button small{font-size:10px}.method-picker button>svg{position:absolute;right:10px;top:15px}.method-picker button[aria-pressed=true]{border-color:var(--primary);background:var(--primary-soft);color:var(--primary)}.question-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.activity-warmup .question-list,.activity-separate .question-list,.activity-explore .question-list{grid-template-columns:1fr}.question-card{border:1px solid var(--border);background:var(--surface);border-radius:var(--radius);padding:24px;min-width:0}.question-heading{display:flex;justify-content:space-between;align-items:flex-start;gap:12px;margin-bottom:10px}.question-heading h3{margin:0;font-size:18px}.question-prompt{font-size:13px;min-height:44px}.question-correct{border-color:#9ab9a7}.answer-badge{font-size:10px;white-space:nowrap;display:flex;align-items:center;gap:4px;padding-top:3px;color:var(--muted)}.answer-badge.is-correct{color:var(--primary)}.answer-input-row{display:flex;align-items:center;gap:12px}.answer-input-row>.field{flex:1}.answer-input-row input{font-family:var(--font-mono);font-size:22px}.equation-prefix{font-family:var(--font-mono);font-size:24px;margin-top:7px}.answer-unit{color:var(--muted);font-size:14px;padding-top:8px}.question-actions{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-top:6px}.draft-state{color:var(--muted);font-size:10px;min-height:21px;margin-top:9px}.hint-text{padding:11px 14px;background:#fff8de;border-radius:8px;font-size:12px;color:#735516;margin-top:10px}.answer-options{border:0;padding:0;margin:12px 0 22px;display:flex;flex-direction:column;gap:9px}.answer-option{display:flex;align-items:flex-start;gap:11px;padding:12px;border:1px solid var(--border);border-radius:var(--radius-sm);cursor:pointer;font-size:13px}.answer-option input{width:18px;height:18px;margin:2px 0 0;accent-color:var(--primary);flex-shrink:0}.answer-option.is-selected{background:var(--primary-soft);border-color:var(--primary)}.answer-options:disabled .answer-option{cursor:not-allowed;opacity:.65}.observation-inputs{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:12px}.observation-inputs input{text-align:center;font-size:20px;font-family:var(--font-mono)}.solution{padding:16px 0 0;margin-top:17px;border-top:1px solid var(--border)}.solution>.eyebrow{display:block;font-size:10px}.solution>strong{display:block;margin-top:7px;font-size:23px;font-family:var(--font-mono);overflow-wrap:anywhere}.solution p{font-size:12px;margin:8px 0 0}.calculation-steps{display:flex;align-items:center;justify-content:space-between;gap:15px;flex-wrap:wrap;background:var(--primary-soft);padding:24px;border-radius:var(--radius);margin-bottom:24px}.calculation-steps>span{font-family:var(--font-mono);font-size:19px}.calculation-steps p{width:100%;font-size:12px;margin:0}.guess-lab{padding:24px;border:1px solid var(--border);border-radius:var(--radius);margin-bottom:24px;background:var(--surface)}.guess-inputs{display:grid;grid-template-columns:1.6fr 1fr auto;gap:18px;align-items:end;margin-top:16px}.guess-inputs .field{margin:0}.formula-gallery{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:15px;margin-bottom:24px}.formula-gallery>div{background:var(--primary-soft);padding:20px 16px;border-radius:var(--radius)}.formula-gallery div>span{font-size:11px;color:var(--muted)}.formula-gallery strong{display:block;font-family:var(--font-mono);font-size:20px;margin:9px 0}.formula-gallery strong em{font-style:normal;color:var(--fixed)}.formula-gallery p{font-size:11px;margin:0}.formula-gallery .gallery-note{grid-column:1/-1;padding:0 10px}.discussion-prompt{background:#fbf6df;border:1px solid #eaddae;padding:21px;border-radius:var(--radius);display:flex;gap:16px;align-items:center;margin-bottom:25px}.discussion-icon{color:#826326}.discussion-prompt strong{font-size:15px}.discussion-prompt p{font-size:12px;margin:5px 0 0}.key-game{display:grid;grid-template-columns:.85fr 1.15fr;align-items:center;gap:35px;border:1px solid var(--border);border-radius:var(--radius-lg);padding:30px;background:var(--surface);margin-bottom:25px}.chest-scene{position:relative;min-height:260px;display:grid;place-items:center;background:radial-gradient(ellipse,#fff5d8 15%,transparent 65%)}.treasure{width:172px;height:128px;position:relative;z-index:1}.treasure-body{position:absolute;bottom:0;width:172px;height:91px;border-radius:5px 5px 15px 15px;background:#ba7441;border:4px solid #8b542d;box-shadow:inset 0 0 0 8px var(--wood)}.treasure-body:before,.treasure-body:after{content:"";position:absolute;height:100%;width:12px;background:var(--sunshine);top:0;left:22px}.treasure-body:after{left:auto;right:22px}.treasure-body>span{position:absolute;z-index:2;left:64px;top:15px;color:#63451c;background:var(--sunshine);border:2px solid #ae8544;border-radius:8px;width:40px;height:47px;display:grid;place-items:center}.treasure-lid{width:182px;height:55px;background:var(--wood);border:4px solid #8b542d;border-radius:40px 40px 5px 5px;position:absolute;z-index:2;top:0;left:-5px;box-shadow:inset 0 0 0 5px #f6c77e;transform-origin:center bottom;transition:transform .28s}.treasure-open .treasure-lid{transform:translateY(-35px) rotate(-12deg)}.chest-shadow{width:183px;height:15px;border-radius:50%;background:#745a2e12;position:absolute;top:calc(50% + 63px)}.chest-spark{color:#aa7c28;position:absolute;font-size:27px}.sparkle-a{top:30px;left:38px;transform:rotate(-15deg)}.sparkle-b{top:60px;right:10px;font-size:35px}.key-challenge h3{font-size:23px;margin-top:10px}.key-challenge p{font-size:13px}.key-challenge form{display:flex;align-items:flex-start;gap:12px}.key-challenge form>.field{flex:1}.key-challenge form>.button{margin-top:29px}.key-trials{display:flex;flex-wrap:wrap;gap:8px}.key-trials>span{display:inline-flex;align-items:center;justify-content:center;min-width:45px;font-family:var(--font-mono);font-size:15px;padding:5px 10px;border-radius:8px;background:var(--background)}.key-trials .key-valid{color:var(--primary);background:var(--primary-soft)}.key-trials .key-invalid{color:var(--muted)}.transfer-tools>details{border:1px solid var(--border);background:var(--surface);border-radius:var(--radius);margin-bottom:20px}details>summary{cursor:pointer;padding:15px 18px;font-size:13px;font-weight:600;color:var(--primary)}.transfer-tools details>.table-lab{margin:0;border:0}.sticks-lab{min-width:0}.sticks-viewport{overflow-x:auto;padding:20px}.sticks-viewport svg{display:block;max-height:190px;min-width:250px;width:100%}.stick{stroke:var(--primary);stroke-width:7;stroke-linecap:round}.stick-fixed{stroke:var(--fixed)}.sticks-viewport text{font-size:16px;fill:var(--muted)}.sticks-lab .lab-controls{font-size:14px}.reflection-scene{padding:35px 25px;text-align:center;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);margin-bottom:24px}.reflection-scene svg{width:190px;height:90px}.reflection-scene blockquote{font-size:32px;font-family:var(--font-display);margin:15px 0 20px;line-height:1.8}.reflection-scene p{font-size:13px}.extension-diagram{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:24px;text-align:center;margin-bottom:24px}.extension-diagram svg{max-width:400px;width:100%;color:var(--primary)}.extension-diagram svg text{font-family:var(--font-sans);font-size:14px;fill:var(--muted)}.extension-diagram p{font-size:13px;margin:12px 0 0}.teacher-notes{border:1px dashed #b4c4b7;border-radius:var(--radius-sm);margin-top:25px;padding:0 6px}.teacher-notes>p{padding:0 14px;font-size:13px}.classroom-toolbar{display:flex;justify-content:space-between;align-items:center;gap:25px;padding:22px 0}.classroom-picker{display:flex;gap:25px;align-items:center;flex:1}.classroom-picker>.field{width:370px;margin:0}.checkbox-label{display:flex;align-items:center;gap:7px;font-size:12px;color:var(--muted);margin-top:27px}.checkbox-label input{width:16px;height:16px;accent-color:var(--primary)}.new-classroom{display:grid;grid-template-columns:1fr 1.5fr;gap:30px;margin-bottom:25px;align-items:center}.new-classroom h2{margin:10px 0}.new-classroom p{font-size:12px;margin-bottom:0}.new-classroom form{display:flex;align-items:flex-end;gap:12px}.new-classroom .field{flex:1;margin:0}.teacher-workspace{display:grid;grid-template-columns:195px minmax(0,1fr);gap:26px;padding-bottom:35px}.teacher-sidebar{min-width:0;padding-top:6px}.sidebar-label{font-size:12px;color:var(--muted);display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:16px}.sidebar-label>span{font-size:10px}.phase-nav{display:flex;flex-direction:column;gap:5px}.phase-item{width:100%;background:transparent;border:1px solid transparent;padding:11px 12px;display:flex;align-items:center;gap:10px;border-radius:var(--radius-sm);color:var(--muted);text-align:left}button.phase-item:hover:not(:disabled){background:var(--primary-soft)}.phase-item.is-current{background:var(--surface);border-color:#bdcfbf;color:var(--primary);box-shadow:0 2px 5px #1b3c2910}.phase-icon{display:grid;place-items:center;width:30px;height:34px}.phase-text{display:flex;flex-direction:column;flex:1;min-width:0}.phase-text strong{font-size:13px}.phase-text small{font-size:10px;margin-top:3px;color:var(--muted)}.lesson-time{display:flex;align-items:center;gap:7px;color:var(--muted);font-size:11px;padding:20px 13px;margin-top:15px;border-top:1px solid var(--border)}.teacher-room-heading{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:20px}.teacher-room-heading h1{font-family:var(--font-sans);font-size:26px;margin:5px 0 0}.teacher-top-grid{min-width:0;display:grid;grid-template-columns:1.05fr 1fr;gap:18px}.teacher-content,.teacher-top-grid>.panel,.roster-panel{min-width:0}.lesson-control{padding:22px}.control-heading{display:flex;justify-content:space-between;align-items:center;gap:10px}.phase-label{font-size:10px;color:var(--muted);background:var(--background);padding:4px 7px;border-radius:5px}.timer{font-family:var(--font-mono);font-size:18px;color:var(--muted);display:inline-flex;align-items:center;gap:7px}.timer-running{color:var(--primary)}.lesson-control h2{font-size:23px;margin:18px 0 10px}.lesson-control>p{font-size:12px;min-height:40px}.control-actions{display:flex;flex-wrap:wrap;gap:9px}.control-actions .button{font-size:12px;padding:10px 13px}.timer-actions{display:flex;gap:7px;align-items:center;font-size:11px;color:var(--muted);margin-top:15px}.timer-actions>span{display:inline-flex;gap:5px;align-items:center;margin-right:auto}.timer-actions .text-button{padding:3px 5px;font-size:11px}.control-notes{border-top:1px solid var(--border);margin-top:8px}.control-notes summary{padding:12px 0;font-size:11px}.control-notes p{font-size:12px;margin-top:0}.projection-links{display:flex;align-items:center;flex-wrap:wrap;gap:8px;padding-top:4px}.projection-links .button{padding:8px 11px;min-height:39px;font-size:11px}.join-panel{display:flex;gap:22px;align-items:flex-start;padding:22px}.join-panel>div:first-child{flex-shrink:0;width:135px}.join-panel>div>.eyebrow{font-size:10px;letter-spacing:.02em}.room-code{display:block;font-family:var(--font-mono);font-size:32px;letter-spacing:.06em;margin:1px 0 15px}.qr-frame{display:grid;place-items:center;background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:5px;flex-shrink:0;overflow:hidden}.qr-frame img{max-width:100%;height:auto;display:block}.qr-frame span{font-size:10px;text-align:center}.join-panel-info{min-width:0;padding-top:7px}.join-panel-info h3{font-size:15px}.join-panel-info p{font-size:11px;margin:4px 0 16px}.join-panel-info>.field{margin-bottom:10px}.join-panel-info .field label{font-size:10px}.join-panel-info .field select{font-size:10px;padding:8px;min-height:39px}.join-panel-info .button{min-height:36px;font-size:11px;padding:7px 10px}.share-url{display:block;width:100%;margin:10px 0;border:0;border-bottom:1px solid var(--border);font-size:10px;background:transparent;color:var(--primary);padding:5px 0}.join-panel-info>small{display:block;font-size:10px;color:var(--muted);line-height:1.8}.stats-row{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:15px;margin:22px 0}.metric{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:17px 19px}.metric>span{display:flex;align-items:center;justify-content:space-between;gap:5px;font-size:11px;color:var(--muted)}.metric>span svg{color:var(--primary)}.metric>strong{display:block;font-size:28px;margin-top:8px;line-height:1.4;letter-spacing:-.03em;font-variant-numeric:tabular-nums}.section-heading{display:flex;align-items:center;gap:10px}.section-heading h2,.section-heading h3{margin:0}.roster-heading{justify-content:space-between;margin-bottom:22px}.roster-heading h2{font-size:19px}.roster-heading p{font-size:11px;margin:7px 0 0}.roster-heading>.button{font-size:11px;min-height:38px;padding:9px 12px}.roster-toolbar{display:flex;align-items:center;gap:16px;margin-bottom:20px}.search-field{display:flex;align-items:center;gap:8px;background:var(--background);border:1px solid var(--border);border-radius:var(--radius-sm);padding:0 12px;flex:1;color:var(--muted);min-width:150px}.search-field input{min-width:0;width:100%;border:0;background:transparent;font-size:12px;min-height:44px;padding:9px 0;color:var(--ink)}.search-field input::-webkit-search-cancel-button{display:none}.roster-toolbar>.field{width:158px;margin:0}.roster-toolbar .field label{font-size:10px}.roster-toolbar .field select{font-size:11px;min-height:41px;padding:8px}.result-count{color:var(--muted);font-size:12px;white-space:nowrap}.table-scroll{overflow-x:auto}table{border-collapse:collapse;width:100%;font-size:12px}th,td{border-bottom:1px solid var(--border);padding:14px 12px;text-align:left;white-space:nowrap}thead{position:sticky;top:0;background:var(--background)}thead th{font-size:11px;font-weight:500;color:var(--muted)}tbody tr:last-child td,tbody tr:last-child th{border-bottom:0}td .button{min-height:31px;font-size:11px;padding:5px 8px}.presence{display:inline-flex;gap:5px;align-items:center;font-size:10px;color:var(--muted)}.presence:before{content:"";display:inline-block;width:5px;height:5px;border-radius:50%;background:var(--muted)}.presence-online{color:var(--primary)}.presence-online:before{background:var(--primary)}.student-state{display:inline-block;font-size:10px;background:var(--background);border-radius:5px;padding:3px 7px;color:var(--muted)}.state-mastered{background:var(--primary-soft);color:var(--primary)}.empty-state{min-height:220px;display:flex;flex-direction:column;gap:12px;justify-content:center;align-items:center;text-align:center;padding:30px 18px;color:var(--muted)}.empty-state h3{color:var(--ink);font-size:16px;margin:0}.empty-state p{font-size:12px;max-width:430px;margin:0}.classroom-maintenance{display:flex;justify-content:space-between;align-items:center;gap:15px;margin-top:20px}.classroom-maintenance .button,.classroom-maintenance .text-link{font-size:11px}.student-detail-list{max-height:60dvh;overflow-y:auto;margin-bottom:20px}.student-detail-list>article{padding:20px 0;border-bottom:1px solid var(--border)}.student-detail-list p{font-size:12px;margin:9px 0 0}.student-detail-list h3{font-size:15px;margin:9px 0}.student-answer{font-family:var(--font-mono);font-size:20px;display:block;overflow-wrap:anywhere}.student-detail-list blockquote{border-left:3px solid var(--border);padding-left:14px;margin:12px 0;font-size:13px}.success-text{color:var(--primary)}.demo-layout{display:grid;grid-template-columns:195px minmax(0,1fr);gap:45px;padding:30px 0 50px}.demo-sidebar{min-width:0;padding-top:10px}.demo-sidebar-note{padding:18px 12px;color:var(--muted);font-size:10px}.demo-content{min-width:0}.demo-toolbar{display:flex;justify-content:space-between;align-items:center;gap:15px}.mode-label{display:flex;align-items:center;gap:12px;font-size:12px;font-weight:600;color:var(--primary)}.mode-label small{font-size:10px;font-weight:400;color:var(--muted)}.demo-toolbar .button{font-size:12px;min-height:40px;padding:9px 12px}.demo-pagination{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-top:30px;padding-top:22px;border-top:1px solid var(--border)}.demo-pagination>span{font-family:var(--font-mono);font-size:12px;color:var(--muted)}.board-main{margin:35px auto}.board-heading{display:flex;justify-content:space-between;gap:30px;align-items:center;margin-bottom:25px}.board-heading h1{font-size:32px;margin:12px 0}.board-heading p{font-size:13px;margin-bottom:0}.board-timer{font-family:var(--font-mono);font-size:39px;letter-spacing:-.04em;display:flex;flex-direction:column;align-items:center;min-width:145px}.board-timer small{font-size:10px;color:var(--muted);font-family:var(--font-sans);letter-spacing:0}.board-overview{display:grid;grid-template-columns:1.1fr 1fr;gap:25px}.board-phase{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:30px;background:var(--primary);color:var(--surface);border-color:var(--primary)}.board-phase .eyebrow{color:var(--sunshine);font-size:11px}.board-phase h2{font-family:var(--font-display);font-size:30px;margin:15px 0 10px}.board-phase p{color:#e5eee5;font-size:12px}.phase-status{display:inline-flex;align-items:center;gap:8px;padding:5px 9px;border-radius:5px;background:#ffffff15;color:#e8f0eb;font-size:11px}.phase-status .live-dot{background:var(--sunshine)}.completion-ring{position:relative;width:150px;height:150px;flex-shrink:0}.completion-ring svg{width:100%;height:100%;transform:rotate(-90deg)}.completion-ring circle{fill:none;stroke-width:8px}.ring-track{stroke:#ffffff25}.ring-value{stroke:var(--sunshine);stroke-linecap:round;transition:stroke-dasharray .18s}.completion-ring>div{position:absolute;inset:0;display:flex;justify-content:center;align-items:center;flex-direction:column}.completion-ring strong{font-size:30px;font-family:var(--font-mono)}.completion-ring span{font-size:10px;color:#e5eee5}.board-stats{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}.board-stats .metric{padding:20px 24px}.board-stats .metric strong{font-size:30px}.board-detail-grid{display:grid;grid-template-columns:1.7fr 1fr;gap:25px;margin-top:25px}.question-progress{padding:26px 28px}.question-progress .section-heading{justify-content:space-between;flex-wrap:wrap}.question-progress h2{font-size:18px}.chart-legend{display:inline-flex;align-items:center;gap:7px;color:var(--muted);font-size:10px}.chart-legend .dot:last-of-type{margin-left:6px}.progress-row{margin-top:24px}.progress-row>div:first-child{display:flex;justify-content:space-between;gap:15px;align-items:center;font-size:12px;margin-bottom:9px}.progress-row strong{font-weight:500}.progress-row strong small{font-size:9px;color:var(--muted);margin-left:7px}.progress-row>div>span{white-space:nowrap;color:var(--muted);font-size:10px}.progress-track{position:relative;height:10px;border-radius:8px;overflow:hidden;background:var(--background)}.progress-track>span{position:absolute;left:0;top:0;height:100%;transition:width .18s}.progress-attempted{background:#b2c2b5}.progress-correct{background:var(--primary)}.progress-row>small{color:var(--muted);font-size:10px;display:block;margin-top:5px}.method-summary{padding:26px}.method-summary>.eyebrow{font-size:10px;letter-spacing:.02em}.method-summary h2{margin:10px 0 22px;font-size:20px}.method-stat{display:flex;align-items:center;gap:12px;margin:18px 0;font-size:11px}.method-stat>div{flex:1;height:6px;background:var(--background);border-radius:5px;overflow:hidden}.method-stat i{display:block;background:#9bb6a3;height:100%}.method-stat strong{font-family:var(--font-mono);font-size:15px;min-width:18px;text-align:right}.method-summary>p{font-size:10px;margin-top:22px}.board-quote{padding:21px 0 0;border-top:1px solid var(--border);color:var(--muted);font-size:13px;line-height:1.9}.board-quote strong{color:var(--primary)}.board-footnote{text-align:center;color:var(--muted);font-size:10px;margin:20px 0 0}@media(min-width:1500px){.demo-page{--page-max: 1450px}.demo-content .activity-intro h1{font-size:42px}.demo-content .question-prompt{font-size:16px}}@media(max-width:1150px){.page{width:calc(100% - 48px)}.home-hero{gap:35px}.teacher-workspace{grid-template-columns:175px minmax(0,1fr);gap:20px}.teacher-top-grid{grid-template-columns:minmax(0,1fr)}.join-panel>div:first-child{display:grid;grid-template-columns:1fr 100px;width:250px}.join-panel .qr-frame{grid-column:2;grid-row:1/3}.join-panel .room-code{grid-column:1}.join-panel-info{flex:1}.stats-row{gap:10px}.metric{padding:15px 14px}.metric>strong{font-size:25px}.board-overview{grid-template-columns:1.15fr 1fr;gap:18px}.board-phase{padding:24px}.board-phase h2{font-size:24px}.completion-ring{width:118px;height:118px}}@media(max-width:900px){.site-header{min-height:86px}.header-actions{gap:10px}.home-hero{grid-template-columns:1fr 1.05fr;gap:20px}.hero-copy h1{font-size:38px}.hero-experiment{padding:14px}.experiment-heading>span:last-child{display:none}.entry-grid{grid-template-columns:repeat(2,1fr)}.join-layout{gap:35px}.join-intro h1{font-size:35px}.teacher-workspace,.demo-layout{grid-template-columns:minmax(0,1fr)}.teacher-sidebar,.demo-sidebar{padding-top:0}.phase-nav{flex-direction:row;overflow-x:auto;padding-bottom:7px}.phase-item{min-width:150px;width:auto}.lesson-time{display:none}.sidebar-label{margin-bottom:10px}.teacher-sidebar .sidebar-label,.demo-sidebar-note{display:none}.demo-layout{gap:20px;padding-top:22px}.board-overview{grid-template-columns:1fr}.board-stats{grid-template-columns:repeat(4,1fr);gap:12px}.board-stats .metric{padding:16px 15px}.board-detail-grid{gap:17px}.key-game{gap:18px;padding:22px}.guess-inputs{grid-template-columns:1.3fr 1fr}.guess-inputs>.button{grid-column:1/-1}.mode-label{flex-wrap:wrap;gap:3px;flex-direction:column;align-items:flex-start}}@media(max-width:600px){.page{width:calc(100% - 32px)}.site-header{min-height:80px;gap:10px}.brand{font-size:16px;gap:9px}.brand-symbol{width:36px;height:36px;border-radius:11px}.brand small{font-size:9px;letter-spacing:0}.header-subject,.desktop-label{display:none}.header-actions{gap:6px}.header-actions .button{padding:8px;font-size:11px;min-height:38px}.header-actions .connection{font-size:10px}.header-actions .connection svg{display:none}.header-link{font-size:11px}.home-hero{grid-template-columns:1fr;gap:35px;padding:35px 0}.hero-copy h1{font-size:44px;margin:19px 0 24px}.hero-copy p{font-size:14px;margin:24px 0}.hero-caption{font-size:11px;margin-top:20px}.eyebrow{font-size:10px}.hero-experiment{padding:16px}.entry-heading{align-items:flex-start;flex-direction:column;gap:5px}.entry-heading h2{font-size:17px}.entry-heading>span{font-size:10px}.entry-grid{gap:12px}.entry-card{padding:18px 16px}.entry-card p{font-size:10px}.entry-card h3{font-size:16px}.site-footer{flex-direction:column;gap:5px;font-size:10px}.join-layout{grid-template-columns:1fr;gap:25px;margin:28px 0}.join-intro .entry-icon,.join-mini-diagram,.join-intro>.field-help{display:none}.join-intro h1{font-size:31px;margin:10px 0}.join-intro h1 br,.join-intro p br{display:none}.join-intro p{font-size:13px;margin:10px 0 0}.join-form,.auth-layout{padding:24px}.auth-layout{margin:28px 0}.auth-layout h1{font-size:26px}.student-main{margin-top:18px}.student-journey{gap:8px;font-size:9px;flex-wrap:wrap}.journey-dots{gap:4px}.journey-dots span{width:12px}.student-name{font-size:11px;max-width:65px;overflow-wrap:anywhere}.personal-stars{font-size:9px;gap:3px}.personal-stars svg{width:13px}.paused-banner,.active-banner{font-size:11px}.activity-intro h1{font-size:29px}.activity-intro p{font-size:13px}.method-picker{grid-template-columns:repeat(2,1fr);gap:8px}.method-picker button{padding:11px 13px}.method-picker button>span{font-size:13px}.method-picker button small{font-size:9px}.method-picker button>svg{top:13px}.question-list{grid-template-columns:1fr;gap:16px}.question-card{padding:20px}.question-heading h3{font-size:17px}.question-prompt{font-size:12px}.question-actions{gap:5px}.question-actions .button{font-size:12px}.lab-toolbar{padding:14px 16px}.lab-instruction{padding:8px 12px;gap:6px}.lab-instruction>span{font-size:9px}.lab-instruction strong,.lab-instruction .text-button{font-size:10px}.lab-controls{gap:16px;padding:13px 16px}.legend-toggle{padding:12px;font-size:10px}.legend{gap:5px}.legend .dot:nth-of-type(2){margin-left:4px}.formula-strip{padding:15px 16px}.formula-strip strong{font-size:21px}.observation-inputs{gap:7px}.observation-inputs input{padding:9px 3px}.calculation-steps{gap:10px;padding:18px}.calculation-steps>span{font-size:14px}.calculation-steps svg{width:13px}.calculation-steps p{font-size:11px}.formula-gallery{grid-template-columns:1fr;gap:10px}.formula-gallery>div{padding:15px 18px}.key-game{grid-template-columns:1fr;gap:6px;padding:20px}.chest-scene{min-height:200px}.chest-scene .sparkle-a{left:30px;top:15px}.key-challenge h3{font-size:20px}.key-challenge form>.button{padding:10px;font-size:11px}.key-challenge form .field input{font-size:14px}.reflection-scene blockquote{font-size:27px}.classroom-toolbar{gap:10px;align-items:flex-end;padding:20px 0}.classroom-picker{gap:5px;align-items:stretch;flex-direction:column;min-width:0}.classroom-picker .field{width:100%}.classroom-picker .field select{font-size:11px;padding:9px;min-height:44px}.checkbox-label{margin-top:0;font-size:10px}.classroom-toolbar>.button{margin-bottom:26px;font-size:11px;padding:10px}.teacher-room-heading{align-items:flex-start}.teacher-room-heading h1{font-size:22px}.teacher-room-heading .connection{margin-top:5px;font-size:10px}.new-classroom{grid-template-columns:1fr;gap:15px;padding:21px}.new-classroom form{flex-wrap:wrap}.new-classroom .field{min-width:100%}.teacher-workspace{gap:17px}.teacher-top-grid{gap:16px}.join-panel{padding:20px;gap:18px}.join-panel>div:first-child{width:113px;display:block}.join-panel .room-code{font-size:26px;margin-bottom:10px}.join-panel .qr-frame{width:110px!important;height:110px!important}.join-panel-info{padding-top:2px}.join-panel-info h3{font-size:13px}.join-panel-info p{font-size:10px;margin-bottom:10px}.join-panel-info>small{font-size:9px}.stats-row{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin:17px 0}.metric{padding:17px}.metric>strong{font-size:27px}.roster-panel{padding:20px}.roster-heading{align-items:flex-start;gap:15px;flex-direction:column}.roster-heading h2{font-size:18px}.roster-toolbar{flex-wrap:wrap;gap:10px}.search-field{min-width:100%}.roster-toolbar .field{flex:1}.result-count{align-self:flex-end;padding-bottom:10px}.classroom-maintenance{flex-direction:column;align-items:flex-start;gap:5px}.demo-layout{gap:16px}.demo-toolbar{gap:10px}.demo-toolbar .button{font-size:11px;padding:8px 10px}.demo-pagination .button{font-size:12px;padding:10px 12px}.board-heading{gap:12px}.board-heading h1{font-size:25px}.board-heading p{font-size:11px}.board-heading .eyebrow{font-size:9px}.board-timer{font-size:28px;min-width:85px}.board-timer small{font-size:9px}.board-phase{padding:23px;gap:14px}.board-phase h2{font-size:24px}.board-phase p{font-size:11px}.completion-ring{width:103px;height:103px}.completion-ring strong{font-size:26px}.completion-ring span{font-size:8px}.board-stats{grid-template-columns:repeat(2,1fr);gap:12px}.board-detail-grid{grid-template-columns:1fr}.question-progress,.method-summary{padding:22px}.question-progress h2{font-size:17px}.board-footnote{font-size:9px}.error-page{margin:30px 0;padding:25px}.error-page h1{font-size:27px}}