:root{color:#173649;font-synthesis:none;--ink:#173649;--teal:#236e78;--pale:#edf7f8;--line:#d4e2e5;--muted:#536c7b;background:#fff;font-family:Arial,Hiragino Kaku Gothic ProN,Yu Gothic,sans-serif;font-size:17px;line-height:1.7}*{box-sizing:border-box}body{margin:0}button,input,select,textarea{font:inherit}button{border:1px solid var(--teal);color:var(--teal);cursor:pointer;background:#fff;border-radius:9px;min-height:46px;padding:11px 24px;font-weight:600}button:hover{background:#f0f7f8}button:disabled{opacity:.5;cursor:wait}button.primary{background:var(--teal);color:#fff}button.primary:hover{background:#195e68}button.selected{border-color:var(--teal);background:#e1f0f2}button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible,a:focus-visible{outline-offset:3px;outline:3px solid #ad742a}.text-button{color:var(--teal);text-underline-offset:4px;background:0 0;border:0;padding:8px;font-weight:400;text-decoration:underline}.text-button:hover{background:0 0}h1,h2,h3,p{margin:0}h1{letter-spacing:.01em;font-size:36px;line-height:1.35}h2{font-size:28px;line-height:1.4}h3{font-size:20px;line-height:1.5}p{margin:12px 0}.muted,small{color:var(--muted);font-size:14px}header{border-bottom:1px solid var(--line)}.header-inner{justify-content:space-between;align-items:center;gap:35px;max-width:1120px;min-height:78px;margin:auto;display:flex}.brand{color:var(--ink);white-space:nowrap;background:0 0;border:0;align-items:center;gap:12px;padding:0;font-size:26px;font-weight:600;display:flex}.brand svg{width:36px;height:36px;color:var(--teal)}nav{align-self:stretch;gap:20px;display:flex}nav button{color:var(--ink);border:0;border-radius:0;padding:0 12px;font-size:16px;position:relative}nav button.active{color:var(--teal)}nav button.active:after{content:"";background:var(--teal);height:3px;position:absolute;bottom:0;left:0;right:0}main{max-width:1120px;min-height:65vh;margin:auto}.welcome{text-align:center;padding:64px 0 34px}.welcome h1{letter-spacing:.02em;font-size:48px;font-weight:700}.welcome p{color:var(--muted);margin:12px 0 0;font-size:24px}.review-band{background:var(--pale);border-radius:8px;justify-content:space-between;align-items:center;gap:30px;margin:0 0 38px;padding:28px 36px;display:flex}.review-band h2{font-size:34px}.review-band p{color:var(--muted);margin:8px 0 12px}.review-band button{min-width:180px}.due-summary{border-left:1px solid #cbdee2;min-width:38%;padding:28px 0 28px 48px}.due-summary strong{color:var(--ink);margin-right:8px;font-size:32px}.home-section{margin-top:38px}.home-section>h2{margin-bottom:14px;font-size:34px}.lesson-row,.audio-row{border-top:1px solid var(--line);border-bottom:1px solid var(--line);align-items:center;gap:30px;padding:25px 30px;display:flex}.lesson-number{white-space:nowrap;border-right:1px solid var(--line);padding-right:24px;font-size:21px;font-weight:700}.lesson-row p{color:var(--muted);margin:2px 0;font-size:16px}.lesson-row .duration{white-space:nowrap;color:var(--muted);border-right:1px solid var(--line);margin-left:auto;padding-right:25px}.lesson-row button{min-width:150px}.audio-row{justify-content:space-between;padding:18px 0}.audio-row p{font-size:18px}.audio-row button{min-width:180px}footer{text-align:center;max-width:1120px;margin:0 auto;padding:20px 0 26px}footer p{color:var(--muted);margin:8px 0;font-size:12px}.study{padding:44px 0 10px}.study>h1{margin-bottom:16px}.study .lead{color:var(--muted);margin-bottom:24px;font-size:20px}.study-top{justify-content:space-between;align-items:center;gap:16px;display:flex}.study-top>span,.section-top>span{color:var(--muted);white-space:nowrap;font-size:14px}.step-nav{flex-wrap:wrap;gap:8px;margin:26px 0;display:flex}.step-nav button,.track-tabs button,.mode-tabs button{border-color:var(--line);padding:9px 15px;font-size:15px}.step-nav button[aria-current]{border-color:var(--teal);background:var(--teal);color:#fff}.study-body{max-width:800px;margin:30px auto;padding-top:10px}.study-body h2{margin-bottom:16px}.study-body h3{margin:22px 0 12px}.section-top{justify-content:space-between;align-items:center;gap:18px;display:flex}.vocab{background:#f5f8f9;margin:14px 0 24px;padding:12px 16px;font-size:14px}.steps li{padding:10px 0}.actions{flex-wrap:wrap;gap:12px;margin:28px 0 16px;display:flex}fieldset{border:0;border-bottom:1px solid var(--line);min-width:0;margin:25px 0;padding:10px 0 25px}legend{max-width:100%;padding:0;font-size:18px;font-weight:600}.choices{grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin-top:10px;display:grid}.choice{border:1px solid var(--line);cursor:pointer;border-radius:8px;align-items:center;gap:10px;padding:13px 14px;font-size:16px;display:flex}.choice.checked{background:var(--pale);border-color:var(--teal)}.choice:has(input:disabled){cursor:default}.choice input{accent-color:var(--teal);flex:0 0 18px;width:18px;height:18px}.feedback{border-left:3px solid var(--teal);background:var(--pale);padding:15px 20px;font-size:16px}.feedback.wrong{background:#fcf7ee;border-color:#a27234}.feedback.blank{background:#f5f6f7;border-color:#84949d}.field{margin:20px 0;font-size:15px;display:block}.field input,.field textarea{width:100%;color:var(--ink);background:#fff;border:1px solid #9bb4bd;border-radius:8px;margin-top:8px;padding:12px 14px;font-size:18px;display:block}textarea{resize:vertical;min-height:150px}.english,.transcript{font-family:Arial,sans-serif;font-size:21px;line-height:1.9}.transcript{white-space:pre-wrap;background:#f6f9fa;border-radius:8px;margin:24px 0;padding:20px 24px}details{border-top:1px solid var(--line);margin:25px 0;padding-top:18px}summary{cursor:pointer;color:var(--teal);font-weight:600}.player{border:1px solid var(--line);background:#fff;border-radius:12px;margin:22px 0;padding:20px 24px}.player-main{align-items:center;gap:22px;display:flex}.play{background:var(--teal);color:#fff;border:0;border-radius:50%;place-items:center;width:54px;min-width:54px;height:54px;padding:13px;display:grid}.play:hover{background:#195e68}.play svg{width:27px;height:27px}.play span{font-size:22px}.seek{flex:1;min-width:0}.seek input{width:100%;accent-color:var(--teal);height:22px}.time{color:var(--muted);justify-content:space-between;font-size:13px;display:flex}.audio-tools{border-top:1px solid var(--line);flex-wrap:wrap;align-items:center;gap:12px;margin-top:18px;padding-top:18px;font-size:14px;display:flex}.audio-tools button{min-height:42px;padding:8px 12px;font-size:14px}.audio-tools select{border:1px solid var(--line);color:var(--ink);background:#fff;border-radius:5px;margin-left:10px;padding:7px}.marks{flex-wrap:wrap;align-items:center;gap:10px;width:100%;display:flex}.marks span{font-size:13px}.track-tabs,.mode-tabs{flex-wrap:wrap;gap:8px;margin:20px 0;display:flex}.review-question{max-width:760px;margin:36px auto;padding:25px 0}.review-question h2{font-size:30px}.answer-reveal{border-left:4px solid var(--teal);background:var(--pale);margin:26px 0;padding:20px 24px}.answer-reveal h3{font-size:26px}.rating{flex-wrap:wrap;gap:12px;margin-top:20px;display:flex}.rating button{flex:1}.skip{margin-top:30px;display:block}.stats{border-top:1px solid var(--line);border-bottom:1px solid var(--line);grid-template-columns:repeat(3,1fr);margin:30px 0 40px;display:grid}.stats>div{border-right:1px solid var(--line);padding:25px}.stats>div:last-child{border:0}.stats span{color:var(--muted);font-size:14px;display:block}.stats strong{margin-top:10px;font-size:38px;display:block}.record-list{margin:25px 0}.record-list>div{border-bottom:1px solid var(--line);justify-content:space-between;gap:30px;padding:15px 0;font-size:16px;display:flex}.record-list>div>span:last-child{white-space:nowrap;color:var(--muted);font-size:14px}.backup{border-top:1px solid var(--line);margin-top:40px;padding-top:28px}.file-button{border:1px solid var(--teal);color:var(--teal);cursor:pointer;border-radius:9px;padding:11px 24px;font-weight:600}.file-button input{max-width:250px;margin-top:8px;font-size:13px;display:block}.notice{background:var(--pale);border-radius:6px;margin:20px 0;padding:16px 20px}.notice.error{color:#7e422b;background:#fff3ec}.notice button{margin-left:12px;font-size:14px}.sr{clip:rect(0, 0, 0, 0);white-space:nowrap;width:1px;height:1px;padding:0;position:absolute;overflow:hidden}@media (width<=1180px){.header-inner,main,footer{margin-left:32px;margin-right:32px}.header-inner{gap:20px}nav{gap:6px}}@media (width<=760px){:root{font-size:16px}.header-inner{min-height:unset;margin:0 20px;display:block}.brand{padding:18px 0 9px;font-size:23px}.brand svg{width:31px;height:31px}nav{justify-content:space-between;gap:0}nav button{min-height:46px;padding:10px 8px;font-size:14px}main,footer{margin:0 20px}.welcome{padding:38px 0 26px}.welcome h1{font-size:30px}.welcome p{font-size:17px}.review-band{margin-bottom:26px;padding:24px;display:block}.review-band h2{font-size:27px}.due-summary{border-left:0;border-top:1px solid var(--line);padding:16px 0 0;margin:20px 0 0!important}.home-section{margin-top:28px}.home-section>h2{font-size:27px}.lesson-row{flex-wrap:wrap;gap:14px;padding:20px 0}.lesson-number{padding-right:16px;font-size:17px}.lesson-row>div{flex:1;min-width:180px}.lesson-row h3{font-size:18px}.lesson-row p{font-size:13px}.lesson-row .duration{border:0;margin-left:0;padding-right:0}.lesson-row button{margin-left:auto}.audio-row{display:block}.audio-row p{margin-bottom:18px;font-size:16px}.audio-row button{width:100%}.study{padding:28px 0}.study-top{display:block}.study-top h1{font-size:27px}.study-top>span{margin-top:8px;display:block}h1{font-size:29px}h2{font-size:25px}.study-body{margin-top:20px}.study .lead{font-size:18px}.section-top,.section-top>span{display:block}.choices{grid-template-columns:1fr}.choice{min-height:50px;font-size:16px}.player{padding:17px}.player-main{gap:13px}.play{width:50px;min-width:50px;height:50px}.audio-tools{gap:9px}.marks{gap:7px}.transcript{padding:17px;font-size:19px}.english{font-size:20px}.rating{gap:8px}.rating button{min-width:90px;padding:10px;font-size:15px}.stats{grid-template-columns:1fr}.stats>div{border-right:0;border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;padding:14px 0;display:flex}.stats strong{margin:0;font-size:30px}.record-list>div,.record-list>div>span{display:block}.file-button{width:100%}.file-button input{max-width:100%}.study-top h1,.welcome h1{overflow-wrap:anywhere}.review-question h2{font-size:25px}footer .text-button{font-size:14px}}@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}
