:root{font-family:system-ui,-apple-system,"Hiragino Kaku Gothic ProN","Noto Sans JP",sans-serif;color:#19323d;background:#f5f7f6;font-size:16px}*{box-sizing:border-box}body{margin:0}button,input,select{font:inherit}button{cursor:pointer}a{color:#0c747d}.shell{display:flex;min-height:100vh}.sidebar{width:246px;flex:none;background:#142e3a;color:#e6f1ee;display:flex;flex-direction:column;padding:29px 16px;position:sticky;top:0;height:100vh}.brand{display:flex;gap:13px;align-items:center;padding:0 12px 38px;font-size:19px;line-height:1.3;letter-spacing:.03em}.brand-mark{height:42px;width:42px;display:grid;place-items:center;background:#70c7b6;color:#142e3a;border-radius:12px;font-weight:900;font-size:23px}.brand small{display:block;color:#8eacb0;font-size:10px;letter-spacing:.15em;margin-top:6px}.sidebar nav{display:grid;gap:7px}.nav{border:0;background:transparent;color:#a9bdc1;text-align:left;border-radius:10px;padding:13px 15px;font-weight:650;display:flex;gap:12px;align-items:center;font-size:15px}.nav span{font-size:21px;width:23px;text-align:center}.nav:hover,.nav.active{background:#28515b;color:#fff}.nav em{font-style:normal;margin-left:auto;background:#ef9c76;color:#152e39;border-radius:999px;padding:1px 7px;font-size:12px}.side-foot{margin-top:auto;padding:15px 12px;font-size:12px;line-height:1.8;color:#91abb0;border-top:1px solid #31505a}.side-foot a{display:block;color:#9adfce;font-size:13px;margin-top:8px}.main{flex:1;min-width:0}.top{height:74px;border-bottom:1px solid #e4e9e8;background:#fff;display:flex;align-items:center;justify-content:flex-end;padding:0 44px}.top-right{display:flex;align-items:center;gap:20px;color:#67808a;font-size:13px}.avatar{width:34px;height:34px;border-radius:50%;background:#e7f3ef;color:#23776d;display:grid;place-items:center;font-weight:700}.mobile-brand,.mobile-nav{display:none}main{max-width:1190px;margin:auto;padding:34px 44px 70px;min-height:calc(100vh - 124px)}footer{padding:20px 44px 30px;max-width:1190px;margin:auto;color:#81939a;font-size:12px;line-height:1.7}.eyebrow{color:#16867d;font-size:12px;letter-spacing:.16em;font-weight:800}.heading{display:flex;justify-content:space-between;align-items:flex-end;gap:15px;margin-bottom:25px}h1{font-size:29px;letter-spacing:-.025em;margin:7px 0 0}h2{font-size:19px;margin:0 0 17px}h3{margin:0 0 9px;font-size:16px}p{line-height:1.75}.muted{color:#70858d}.hero{background:#173b46;color:#fff;border-radius:18px;padding:31px 34px;display:flex;justify-content:space-between;gap:28px;align-items:center;position:relative;overflow:hidden}.hero:after{content:"";position:absolute;width:260px;height:260px;border:1px solid #6fc9b64a;border-radius:50%;right:-65px;top:-145px;box-shadow:0 0 0 35px #6fc9b618,0 0 0 72px #6fc9b612;pointer-events:none}.hero>*{position:relative;z-index:1}.hero h2{font-size:24px;margin:8px 0}.hero p{margin:0;color:#bed3d3;font-size:14px}.hero .eyebrow{color:#88ddc9}.countdown{min-width:145px;border-left:1px solid #ffffff3a;padding-left:24px;color:#bee4db;font-size:13px}.countdown strong{display:block;color:#fff;font-size:38px;line-height:1.15}.countdown small{font-size:13px;margin-left:3px}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:15px;margin:18px 0 26px}.stat,.card{background:#fff;border:1px solid #e3eae8;border-radius:15px;box-shadow:0 3px 14px #12373c08}.stat{padding:21px 23px}.stat label{display:block;color:#667e86;font-size:13px;margin-bottom:5px}.stat strong{font-size:27px;color:#15333d}.stat small{font-size:13px;color:#78919a;margin-left:5px}.grid{display:grid;grid-template-columns:1.55fr 1fr;gap:17px}.card{padding:24px}.task{display:flex;gap:14px;padding:15px 0;border-top:1px solid #edf1ef;align-items:flex-start}.task:first-of-type{border-top:0}.task-icon{width:36px;height:36px;background:#e8f5f1;color:#1f8b7d;display:grid;place-items:center;border-radius:10px;flex:none}.task b{display:block;font-size:15px}.task small{color:#71868d;line-height:1.6}.task button{margin-left:auto;white-space:nowrap}.btn{border:0;border-radius:9px;background:#167b78;color:#fff;padding:11px 17px;font-weight:700;font-size:14px}.btn:hover{background:#115f5e}.btn.outline{background:#fff;color:#166d70;border:1px solid #b4d7d0}.btn.ghost{background:#edf5f2;color:#236e68}.btn:disabled{opacity:.45;cursor:not-allowed}.inline-link{border:0;background:transparent;color:#0c747d;font-weight:700;padding:5px;font-size:13px}.progress-track{background:#e7efec;border-radius:30px;height:9px;overflow:hidden;margin:16px 0 8px}.progress-track i{display:block;height:100%;background:#57b6a1;border-radius:30px}.subject-row{display:flex;justify-content:space-between;align-items:center;margin:14px 0 5px;font-size:14px}.subject-row b{color:#1b4149}.subject-row span{color:#71878d}.tip{background:#f0f8f4;border:1px solid #d7eae2;border-radius:11px;padding:15px 17px;font-size:14px;color:#315752;line-height:1.7}.controls{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.seg{background:#e9efed;padding:4px;border-radius:11px;display:flex;gap:3px;flex-wrap:wrap}.seg button{border:0;background:transparent;padding:9px 14px;border-radius:8px;color:#526b72;font-size:14px}.seg button.active{background:#fff;color:#164b50;font-weight:700;box-shadow:0 2px 6px #14393914}.quiz-card{padding:30px;margin-top:19px}.quiz-meta{display:flex;gap:9px;align-items:center;color:#6b858a;font-size:13px;font-weight:700}.pill{background:#e8f3ef;color:#228476;border-radius:99px;padding:5px 10px}.question{font-size:21px;line-height:1.65;margin:21px 0}.option{width:100%;background:#fff;border:1px solid #dbe5e2;border-radius:10px;text-align:left;padding:15px 18px;margin:6px 0;display:flex;align-items:flex-start;gap:13px;color:#27414a;font-size:15px;line-height:1.5}.option:hover:not(:disabled){border-color:#64b6a8;background:#f7fcf9}.option .letter{border:1px solid #b8c9c9;min-width:25px;height:25px;border-radius:6px;text-align:center;color:#68818a;font-size:13px;line-height:23px}.option.correct{background:#edf8f2;border-color:#45ad82}.option.wrong{background:#fff2ef;border-color:#e88c77}.option:disabled{cursor:default}.answer-box{margin-top:19px;border-radius:11px;padding:20px;background:#f2f8f5;border-left:4px solid #38a87e}.answer-box.bad{background:#fff6f2;border-color:#db8a69}.answer-box b{display:block;margin-bottom:7px}.answer-box p{margin:0;font-size:14px}.quiz-actions{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-top:20px}.review-list{display:grid;gap:12px}.review-item{display:flex;align-items:center;justify-content:space-between;gap:15px}.review-item small{display:block;color:#71858d;margin-top:6px}.empty{text-align:center;padding:58px 24px}.empty .icon{font-size:34px;color:#65ad9d}.source-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:15px}.source-card{display:block;text-decoration:none;color:inherit;padding:20px;border:1px solid #e3eae8;background:#fff;border-radius:13px}.source-card:hover{border-color:#56ae9a;transform:translateY(-2px)}.source-card span{color:#178176;font-size:12px;font-weight:800}.source-card b{display:block;margin:8px 0;font-size:17px}.source-card p{font-size:13px;color:#73868c;margin:0}.guide-block{padding:24px;margin-bottom:17px}.guide-block p{margin:0 0 12px;font-size:14px}.guide-block ul{padding-left:22px;margin:10px 0;line-height:1.85;color:#37545e;font-size:14px}.plan-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:13px}.plan-step{border-left:3px solid #66bba5;background:#f5faf7;padding:16px;border-radius:4px 10px 10px 4px}.plan-step b{display:block;font-size:14px}.plan-step p{font-size:13px;color:#5c767c;margin:5px 0 0}.note{font-size:12px;color:#71868e}.form-row{display:flex;gap:12px;align-items:center;flex-wrap:wrap}.form-row input{width:90px;padding:10px;border:1px solid #c8d8d4;border-radius:8px;color:#1d3b43}.breakdown{display:flex;flex-wrap:wrap;gap:8px}.breakdown span{background:#eef5f2;border-radius:50px;padding:7px 10px;font-size:12px;color:#476b68}@media(max-width:950px){.sidebar{width:210px}.top{padding:0 25px}main{padding:25px}footer{padding:20px 25px}.grid{grid-template-columns:1fr}.source-grid{grid-template-columns:1fr 1fr}}@media(max-width:700px){.sidebar{display:none}.mobile-brand{display:flex;align-items:center;gap:9px;font-size:15px;color:#173b46}.mobile-brand:first-letter{color:#137b72}.mobile-nav{display:flex;position:fixed;bottom:0;left:0;right:0;background:#fff;border-top:1px solid #dce6e2;z-index:10;justify-content:space-around;padding:6px 3px max(6px,env(safe-area-inset-bottom))}.mobile-nav button{border:0;background:transparent;color:#758990;min-width:65px;display:grid;place-items:center;font-size:23px;line-height:1.1;padding:3px}.mobile-nav button.active{color:#117b73}.mobile-nav small{font-size:11px;margin-top:4px}.top{height:58px;padding:0 17px;justify-content:space-between}.top-right{gap:9px}.top .date{display:none}main{padding:21px 15px 90px;min-height:calc(100vh - 58px)}footer{padding:5px 16px 100px}.heading{margin-bottom:18px}h1{font-size:23px}.hero{padding:23px;align-items:flex-start}.hero h2{font-size:20px}.hero p{font-size:12px}.countdown{min-width:75px;padding-left:13px;font-size:11px}.countdown strong{font-size:27px}.stats{gap:8px;margin:12px 0 18px}.stat{padding:14px 11px}.stat label{font-size:11px}.stat strong{font-size:20px}.stat small{font-size:10px}.card{padding:19px}.quiz-card{padding:19px}.question{font-size:18px}.source-grid,.plan-grid{grid-template-columns:1fr}.seg button{padding:8px 10px;font-size:13px}.task button{padding:7px 4px}.review-item{align-items:flex-start}.review-item .btn{white-space:nowrap;padding:9px}.guide-block{padding:18px}}@media(max-width:380px){.hero{display:block}.countdown{border:0;padding:14px 0 0}.countdown strong{display:inline;margin-right:4px}.stats{grid-template-columns:1fr 1fr}.stats .stat:last-child{grid-column:span 2}}