:root{--ink:#242720;--dim:#656b60;--line:#dedfd5;--bg:#f7f8f3;--paper:#fff;--yellow:#ffd345;--amber:#f4be26;--mono:"SFMono-Regular",Consolas,"Liberation Mono",monospace;--sans:Inter,"Helvetica Neue",Arial,"Hiragino Kaku Gothic ProN","Hiragino Sans","Yu Gothic",Meiryo,sans-serif;color-scheme:light}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);font-size:14px;-webkit-font-smoothing:antialiased}button,input,select{font:inherit;color:inherit}button,select,a{touch-action:manipulation}button,a{ -webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:default;opacity:.38}a{color:inherit;text-decoration:none}button{background:none;border:0}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #2674ac;outline-offset:3px}button:hover:enabled,a:hover{filter:brightness(.96)}button:active:enabled{transform:translateY(1px)}svg{vertical-align:middle;flex-shrink:0}.skip{position:fixed;top:-80px;left:12px;background:var(--ink);color:#fff;padding:12px;z-index:100}.skip:focus{top:10px}.site-head{background:#fff;border-bottom:1px solid var(--line)}.head-inner{height:76px;max-width:1440px;padding:0 clamp(24px,5vw,76px);margin:auto;display:flex;align-items:center;gap:40px}.brand{display:inline-flex;align-items:center;gap:10px;font-size:31px;font-weight:810;letter-spacing:-1.95px;line-height:1}.brand-mark{width:37px;height:39px}.brand-last{font-weight:650}.head-inner nav{display:flex;align-items:center;gap:8px;margin:auto}.nav-item{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:690;text-align:center;padding:11px 15px;border-radius:8px;white-space:nowrap}.nav-item.active{background:#fff1b9;color:#302e20}.nav-item:not(.active):hover{background:#f3f4ef}.timer-link,.dark-button,.yellow-button,.line-button,.icon-btn,.pill-btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-weight:700}.timer-link,.dark-button{background:var(--ink);color:white}.timer-link{padding:10px 17px;border-radius:9px;gap:9px}.timer-link span:last-child svg{width:14px}.timer-link.active{box-shadow:0 0 0 3px var(--yellow)}.dark-button,.yellow-button,.line-button{border-radius:9px;padding:11px 17px;font-size:13px}.yellow-button{background:var(--yellow);color:#22251b;border:1px solid #e3b845}.line-button,.icon-btn,.pill-btn{border:1px solid var(--line);background:#fff}.icon-btn{width:35px;height:35px;border-radius:8px;padding:0}.pill-btn{border-radius:8px;padding:9px 13px;font-size:12px}.pill-btn svg:first-child{color:#5c614d}main{max-width:1440px;margin:auto;padding:35px clamp(24px,5vw,76px) 36px;outline:0}.page-heading{display:flex;align-items:center;justify-content:space-between;gap:20px;margin:0 0 23px}.kicker{font-family:var(--mono);font-size:10px;line-height:1.35;letter-spacing:.16em;font-weight:700;display:flex;align-items:center;gap:8px;color:#60674f;margin-bottom:9px}.kicker::before{content:"";width:19px;height:3px;background:#edbe30}.page-heading h1{font-size:clamp(29px,3.1vw,43px);font-weight:800;letter-spacing:-.065em;line-height:1.3;margin:0}.page-heading p{font-size:13px;line-height:1.7;color:var(--dim);margin:8px 0 0}.level-btn{align-self:flex-end;margin-bottom:2px;box-shadow:0 1px 1px #18220b04}.level-btn .tiny-level{font-weight:500;color:var(--dim);border-right:1px solid var(--line);padding-right:9px;margin-right:1px}.workspace{display:grid;grid-template-columns:minmax(0,1.62fr) minmax(315px,1fr);gap:20px;align-items:stretch}.panel{border:1px solid var(--line);background:white;border-radius:16px;box-shadow:0 2px 4px #23281704}.player{display:flex;flex-direction:column;min-width:0;overflow:hidden}.stage{position:relative;isolation:isolate;flex:1;min-height:300px;background-color:#f8e7a6;background-image:radial-gradient(#aca16b66 .85px,transparent .95px),radial-gradient(ellipse at 45% 30%,#fff2c2 0%,#f8e7a6 62%,#f1d888 100%);background-size:15px 15px,100% 100%;border-bottom:1px solid #ddd3a5;overflow:hidden}.cube-host{position:absolute;inset:28px 0 20px;min-width:0;display:block}.stage-top{position:absolute;pointer-events:none;top:16px;left:17px;right:16px;display:flex;align-items:center;justify-content:space-between;z-index:2}.sticker-chip{display:inline-flex;align-items:center;gap:7px;padding:6px 9px;border:1px solid #d5c78a;background:#fff8d9dc;border-radius:6px;font:650 11px var(--mono);letter-spacing:.025em}.stage-actions{display:flex;gap:6px}.stage-actions button{pointer-events:auto;display:grid;place-items:center;width:29px;height:29px;border:1px solid #c9ba8390;background:#fffae2b5;border-radius:6px}.view-hint{position:absolute;left:17px;bottom:13px;color:#5c573f;display:flex;align-items:center;gap:5px;font-size:10px;font-weight:600;pointer-events:none}.axis{position:absolute;bottom:12px;right:16px;width:51px;height:45px;pointer-events:none}.player-footer{padding:16px 20px 17px;background:#fff}.control-head,.between{display:flex;align-items:center;justify-content:space-between;gap:12px}.control-head{margin-bottom:10px}.control-head strong{font-size:12px}.numeric,.counter{font-family:var(--mono);font-variant-numeric:tabular-nums}.counter{font-size:11px;color:var(--dim)}.sequence{display:flex;gap:6px;overflow:auto;padding:2px 1px 4px;margin:0 0 12px;scrollbar-width:thin}.move-chip{height:32px;min-width:35px;flex-shrink:0;border:1px solid var(--line);background:#f7f8f4;border-radius:6px;font:700 16px var(--mono);padding:4px 8px}.move-chip.current{background:#fff1b5;border-color:#e4bd45}.move-chip.done{background:#edf3e9;color:#426242;border-color:#ceddc9}.playback{display:flex;align-items:center;gap:8px}.playback .dark-button{min-width:94px;height:35px;padding:0 13px}.transport{border:1px solid var(--line);border-radius:7px;width:33px;height:35px;display:grid;place-items:center;background:#fff}.playback .speed{margin-left:auto}.speed,.mini-select{border:1px solid var(--line);border-radius:7px;background:white;height:35px;padding:0 8px;font-size:12px;font-weight:650}.mode-select{font-size:11px;letter-spacing:.01em;border:0;background:transparent;color:var(--dim);text-decoration:underline;text-underline-offset:3px}.guide{display:flex;flex-direction:column;min-width:0;padding:21px 23px 18px}.guide-meta,.card-top,.card-bottom,.tagline{display:flex;align-items:center;gap:8px}.guide-meta{justify-content:space-between}.eyetag{font-size:10px;font-weight:800;letter-spacing:.065em;display:inline-flex;align-items:center;gap:6px}.tag,.soft-tag,.current-tag{display:inline-flex;align-items:center;gap:5px;font-size:11px;line-height:1.3;font-weight:700;padding:4px 8px;border-radius:5px}.tag{background:#fff0ae;color:#5c4b14;font-family:var(--mono)}.soft-tag{background:#f0f2eb;color:#535c4e}.text-btn{display:inline-flex;align-items:center;gap:4px;color:#5a6053;font-size:11px;font-weight:650;padding:3px 0}.guide h2{font-size:clamp(23px,2.18vw,31px);line-height:1.35;letter-spacing:-.05em;margin:11px 0 6px}.guide .summary{color:var(--dim);font-size:12.5px;line-height:1.75;margin:0}.guide-rule{height:1px;background:var(--line);margin:15px 0}.guide h3{margin:0;display:flex;gap:6px;align-items:center;font-size:13px}.substep{padding:3px 0;margin-left:4px;color:#6b705e;font-size:11px}.guide-list{display:grid;gap:5px;margin:10px 0 13px;max-height:188px;overflow:auto;padding:1px 2px 1px 0;scrollbar-width:thin}.guide-row{display:flex;align-items:center;padding:6px 9px;gap:11px;width:100%;border-radius:7px;color:var(--ink);text-align:left;min-height:40px}.guide-row.focused{background:#faf6e4}.guide-row:hover{background:#f4f5ef}.row-token{min-width:33px;height:31px;padding:2px 4px;border-radius:5px;background:#f2f3ee;border:1px solid #e2e3db;font:700 16px/25px var(--mono);text-align:center}.focused .row-token{background:#ffda66;border-color:#e6be47}.row-desc{display:flex;align-items:center;flex-wrap:wrap;column-gap:9px;row-gap:1px}.row-desc strong{font-size:12px}.row-desc small{font-size:10px;color:var(--dim)}.guide-bottom{margin-top:auto;padding-top:10px}.guide-bottom .yellow-button{justify-content:space-between;width:100%;min-height:39px}.completed-button{background:#e8f2dd;border-color:#d0dfbf}.more-tools{margin-top:29px}.section-title{display:flex;align-items:center;gap:9px;margin:0 0 13px;font-size:20px;font-weight:800;letter-spacing:-.055em}.section-title>svg{color:#535d4c}.tool-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.tool-card{display:grid;grid-template-columns:minmax(0,1fr) 103px;align-items:center;position:relative;isolation:isolate;border:1px solid var(--line);background:var(--card-bg);border-radius:12px;min-height:111px;padding:17px 14px 17px 18px;transition:transform .18s,border-color .18s,box-shadow .18s}.tool-card:hover{filter:none;transform:translateY(-2px);box-shadow:0 4px 12px #2427200b;border-color:#aeb5a0}.tool-card h3{font-size:clamp(16px,1.42vw,21px);letter-spacing:-.055em;margin:0 0 6px;line-height:1.4}.tool-card p{font-size:11px;line-height:1.65;margin:0;color:#64695f}.tool-art{width:100%;overflow:visible}.card-jump{position:absolute;top:9px;right:9px;color:#696e61}.footer{margin-top:27px;padding:14px 0 0;border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:12px;color:#707667;font-size:10px}.footer strong{color:#4b5345;font-size:12px;font-weight:750;letter-spacing:-.025em}.footer button{font-size:10px;color:inherit;text-decoration:underline;text-underline-offset:2px}
.dialog-bg{position:fixed;inset:0;display:flex;align-items:center;justify-content:center;padding:20px;background:#1b211a69;z-index:20;backdrop-filter:blur(3px)}.dialog{padding:23px;max-width:570px;max-height:85dvh;overflow:auto;background:#fff;border-radius:16px;width:100%;box-shadow:0 20px 70px #14191435;overscroll-behavior:contain}.dialog h2{margin:0;font-size:23px;letter-spacing:-.045em}.dialog p,.long-text{font-size:13px;line-height:1.8;color:var(--dim)}.dialog .between{margin-bottom:14px}.dialog-choices,.lesson-list{display:grid;gap:8px}.choice-card{display:flex;align-items:center;gap:12px;min-height:60px;padding:12px 15px;border:1px solid var(--line);border-radius:9px;text-align:left;background:white}.choice-card:hover,.choice-card.chosen{border-color:#d1b246;background:#fff9df}.choice-card .choice-main{flex:1;min-width:0}.choice-card strong,.choice-card small{display:block}.choice-card small{font-size:11px;color:var(--dim);margin-top:4px;line-height:1.55}.choice-card .count{font-size:11px;color:#6e7467}.modal-select{border:1px solid var(--line);border-radius:8px;min-height:38px;padding:6px 8px;max-width:100%;background:white;font-weight:650}.menu-filter{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:14px}.current-tag{background:#dfeace;color:#466234}.dialog a.source{display:flex;gap:7px;align-items:center;padding:10px 0;color:#2e6742;font-weight:650;border-bottom:1px solid var(--line)}#notice{position:fixed;z-index:30;bottom:22px;left:50%;transform:translateX(-50%);border-radius:10px;background:#272d22;color:white;box-shadow:0 4px 15px #0002;padding:11px 18px;font-size:13px;pointer-events:none;opacity:0;transition:opacity .15s;max-width:90vw}#notice.visible{opacity:1}.player.big{position:fixed;z-index:16;inset:4vh 6vw;box-shadow:0 0 0 200vmax #1b211aab}.player.big .stage{min-height:0}.player.big .cube-host{inset:45px 0 35px}.free-controls{display:flex;gap:5px;flex-wrap:wrap}.free-controls .move-chip{min-width:30px;font-size:14px}.free-controls+.playback{margin-top:12px}.sub-nav{display:flex;flex-wrap:wrap;align-items:center;gap:7px;margin:0 0 20px}.filter-btn{border:1px solid var(--line);border-radius:8px;background:white;padding:9px 14px;font-size:12px;font-weight:650}.filter-btn.on{background:var(--ink);border-color:var(--ink);color:white}.level-strip{padding:18px 20px;background:#fbf2cb;border:1px solid #e5d79e;margin-bottom:16px;border-radius:12px;display:flex;align-items:center;gap:16px;justify-content:space-between}.level-strip h2{font-size:20px;letter-spacing:-.035em;margin:0}.level-strip p{margin:5px 0 0;color:#686a56;font-size:12px;line-height:1.6}.progress-count{white-space:nowrap;font-size:12px;color:#5d614d}.progress-count progress{display:block;width:95px;height:6px;margin-top:7px;accent-color:#7a8a49}.course-cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:13px}.course-card{padding:19px;display:flex;flex-direction:column;gap:9px}.course-card h3{font-size:19px;margin:0;letter-spacing:-.035em}.course-card p{font-size:12px;color:var(--dim);line-height:1.8;margin:0 0 6px}.card-bottom{justify-content:space-between;margin-top:auto;padding-top:10px;border-top:1px solid #eceee6}.card-bottom span{font-size:11px;color:var(--dim)}.card-bottom button{color:#242a20;font-size:12px;font-weight:700;display:flex;align-items:center;gap:6px}.gloss-toolbar{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:15px}.searchbox{display:flex;align-items:center;gap:9px;background:white;border:1px solid var(--line);padding:9px 12px;border-radius:8px;min-width:min(100%,320px)}.searchbox input{border:0;outline:0;width:100%;background:transparent;font-size:13px}.searchbox:focus-within{outline:2px solid #848d6d}.gloss-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.term-card{padding:17px;display:flex;align-items:flex-start;flex-direction:column}.term-card .tag{font-family:inherit;margin-bottom:9px}.term-card h2{font-size:20px;margin:0 0 2px}.reading{font-size:11px;color:#6b7364}.term-card p{font-size:12px;color:#545d4d;line-height:1.8;margin:9px 0}.term-card button{margin-top:auto;line-height:1.6}.empty{grid-column:1/-1;padding:26px;background:#fff;border:1px dashed #cbd2c3;border-radius:10px;color:var(--dim);text-align:center}.quiz-layout{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(0,1fr);gap:18px}.quiz-stage{height:345px;border:0;border-radius:14px 14px 0 0}.quiz-stage .cube-host{inset:25px 0}.quiz-foot{display:flex;align-items:center;gap:10px;padding:14px 17px}.quiz-panel{padding:21px}.quiz-panel h2{font-size:23px;margin:13px 0 8px}.quiz-panel p{color:var(--dim);font-size:13px;line-height:1.7}.answers{display:grid;gap:8px;margin-top:14px}.answer{background:#fff;border:1px solid var(--line);border-radius:8px;padding:10px 12px;text-align:left;display:flex;align-items:center;gap:9px;font-size:13px;font-weight:650}.answer span{display:grid;place-items:center;border:1px solid var(--line);border-radius:5px;width:23px;height:23px;color:var(--dim);font:600 12px var(--mono)}.answer.correct,.feedback.good{background:#e9f4df;border-color:#b4cfa2}.answer.incorrect,.feedback.miss{background:#fff0e9;border-color:#e6bfae}.answer:disabled{opacity:1}.feedback{margin:15px 0;border:1px solid;border-radius:8px;padding:11px 13px;font-size:13px;line-height:1.75}.quiz-end{text-align:center;padding:38px}.quiz-end>svg{color:#8c762a;background:#fff0ad;border-radius:14px;box-sizing:content-box;padding:15px}.quiz-end h2{font-size:29px}.quiz-end p{color:var(--dim);line-height:1.75}.visual-preview{position:relative;height:240px;border:1px solid #dfd5ac;background-color:#fbefbc;border-radius:12px;overflow:hidden}.visual-preview .cube-host{inset:9px}.noscript{padding:20px}
@media(min-width:1400px){main{padding-top:40px}.stage{min-height:350px}.guide{padding:24px 26px}.guide-list{gap:8px}.tool-card{min-height:125px;grid-template-columns:1fr 118px}.more-tools{margin-top:34px}}
@media(max-width:1080px){.head-inner{gap:20px;padding-inline:28px}.head-inner nav{gap:2px}.nav-item{padding:10px 11px}.workspace{grid-template-columns:minmax(0,1.42fr) minmax(302px,1fr);gap:14px}main{padding:28px 28px 24px}.guide{padding:17px 18px}.tool-card{grid-template-columns:1fr 79px;padding:13px;min-height:98px}.tool-card p{font-size:10px}.stage{min-height:290px}.course-cards,.gloss-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:780px){.head-inner{height:auto;min-height:59px;flex-wrap:wrap;gap:0;padding:10px 18px 0;justify-content:space-between}.brand{font-size:26px;gap:8px}.brand-mark{width:30px;height:32px}.head-inner nav{order:3;width:100%;margin:7px 0 0;padding:0 0 7px;justify-content:space-between}.nav-item{min-height:35px;font-size:12px;padding:6px 11px;gap:6px}.nav-item svg{width:16px}.timer-link{font-size:12px;padding:8px 11px}.timer-link svg{width:16px;height:16px}main{padding:24px 18px}.page-heading{flex-wrap:wrap;gap:9px;margin-bottom:18px}.page-heading h1{font-size:29px}.kicker{font-size:9px;margin-bottom:6px}.page-heading p{font-size:12px}.level-btn{margin:0;font-size:11px;padding:6px 9px}.workspace{grid-template-columns:minmax(0,1.1fr) minmax(260px,1fr)}.guide{padding:15px}.guide h2{font-size:22px}.guide-list{gap:2px}.row-desc small{display:none}.tool-card{grid-template-columns:1fr;min-height:144px;padding:12px;align-content:start}.tool-art{max-width:78px;justify-self:end;height:57px}.tool-grid{gap:8px}.tool-card h3{font-size:15px}.tool-card p{font-size:10px}.quiz-layout{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:640px){main{padding:22px 15px}.site-head .head-inner{padding-inline:15px}.nav-item{font-size:11px;padding:6px 8px}.workspace,.quiz-layout{grid-template-columns:1fr}.page-heading{align-items:flex-start}.level-btn{margin-top:3px}.stage{min-height:270px}.guide{padding:17px 18px}.guide-list{max-height:195px}.row-desc small{display:inline}.tool-grid{grid-template-columns:1fr}.tool-card{grid-template-columns:1fr 87px;min-height:83px;align-items:center;padding:11px 17px}.tool-art{max-width:87px;height:62px}.tool-card h3{font-size:17px}.tool-card p{font-size:11px}.tool-card .card-jump{right:6px;top:6px}.more-tools{margin-top:23px}.course-cards,.gloss-grid{grid-template-columns:1fr}.quiz-stage{height:255px}.quiz-panel{padding:17px}.quiz-end{padding:24px}.player.big{inset:2dvh 3vw}.player-footer{padding:13px 15px}.level-strip{align-items:flex-start;padding:14px}.level-strip h2{font-size:17px}.filter-btn{padding:7px 10px;font-size:11px}.sub-nav{gap:5px}.footer{align-items:flex-start}.level-btn .tiny-level{display:none}}
@media(max-width:360px){.nav-item{gap:3px;padding:5px}.page-heading h1{font-size:26px}.playback{gap:5px}.playback .dark-button{min-width:78px}.transport{width:28px}.guide-meta{gap:6px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition-duration:0s!important}}
.step-title{font-size:11px;line-height:1.65;color:#707567;margin-top:7px;display:flex;justify-content:space-between;gap:5px;align-items:baseline}.detail-link{font-size:10px;white-space:nowrap;padding:1px 0;color:#59634e}.yellow-button>span{display:inline-flex;align-items:center;gap:6px}
.inline-term{display:inline;padding:0;font:inherit;color:inherit;text-decoration:underline dotted #849071;text-underline-offset:3px}.tag .inline-term{text-decoration:underline dotted #9c842e}.stage:not(.quiz-stage) .cube-host{inset:11px 0 14px}.player.big .stage .cube-host{inset:28px 0}.quiz-stage .cube-host{inset:23px 0}
.face-note{margin:-4px 0 1px;color:#73796e;font-size:10px;line-height:1.65}
.quiz-type{display:inline-flex;align-items:center;gap:8px;font-size:12px;font-weight:650;color:#606854;margin-right:4px}.quiz-type .modal-select{color:var(--ink);font-size:12px}.review-case{margin-left:6px}.quiz-foot{flex-wrap:wrap}.quiz-foot .counter{margin-left:auto}.answer{overflow-wrap:anywhere}