:root{--navy:#092b57;--deep:#071e3d;--gold:#ae8b3d;--ink:#162a43;--muted:#617185;--line:#e2e7ee;--bg:#f4f6fa;--green:#176844;--orange:#9a5618;--red:#aa3340}*{box-sizing:border-box}body{margin:0;color:var(--ink);background:var(--bg);font:16px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans JP","Hiragino Kaku Gothic ProN",Meiryo,sans-serif}button,input,textarea,select{font:inherit}button,a,input,textarea,select{outline-offset:4px}button{cursor:pointer}a{color:var(--navy);text-decoration:none}button:disabled{opacity:.55;cursor:wait}.loading{padding:15vh 7vw;text-align:center}.shell{display:grid;grid-template-columns:256px minmax(0,1fr);min-height:100vh}.sidebar{background:var(--deep);color:white;position:sticky;top:0;height:100vh;padding:32px 20px;display:flex;flex-direction:column}.brand{padding:0 8px 26px;border-bottom:1px solid #ffffff25;margin-bottom:25px}.brand img{width:100%;display:block}.brand p{font-size:14px;letter-spacing:.15em;margin:18px 0 0;color:#d9c08b}.nav{display:grid;gap:6px}.nav a{display:flex;align-items:center;gap:12px;color:#c9d5e4;padding:12px 15px;border-radius:8px;font-size:15px}.nav a.active{background:#ffffff12;color:white;box-shadow:inset 3px 0 var(--gold)}.nav a:hover{background:#ffffff0d}.nav svg{width:20px;height:20px;stroke:currentColor;fill:none;stroke-width:1.7}.side-bottom{margin-top:auto;padding:24px 12px 0;font-size:14px;color:#90a5bd}.role{display:inline-flex;font-size:13px;padding:3px 8px;border:1px solid #ffffff40;border-radius:4px;margin-top:7px}.main{min-width:0}.topbar{height:78px;display:flex;align-items:center;justify-content:space-between;padding:0 42px;background:white;border-bottom:1px solid var(--line);gap:16px}.topbar .site-name{font-size:15px;color:var(--muted)}.user-tools{display:flex;align-items:center;gap:16px;font-size:14px}.avatar{background:#edf1f7;border:1px solid var(--line);width:34px;height:34px;border-radius:50%;display:grid;place-items:center;color:var(--navy)}.text-btn{border:0;background:none;color:var(--muted);padding:5px}.content{padding:36px 42px 60px;max-width:1520px;margin:auto}.page-heading{display:flex;align-items:end;justify-content:space-between;gap:20px;margin-bottom:28px}.eyebrow{font-size:12px;letter-spacing:.16em;font-weight:700;color:var(--gold);margin:0 0 6px}h1{font-size:28px;letter-spacing:.03em;margin:0 0 6px;line-height:1.45}h2{font-size:20px;line-height:1.5;margin:0}h3{font-size:17px;line-height:1.6;margin:0}.sub{color:var(--muted);font-size:15px;margin:0}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:var(--navy);color:white;padding:10px 18px;border:1px solid var(--navy);border-radius:7px;font-size:15px;font-weight:600;white-space:nowrap}.btn.secondary{background:white;color:var(--navy);border-color:#cbd5e1}.btn.gold{background:var(--gold);border-color:var(--gold);color:#fff}.btn.small{font-size:14px;padding:7px 13px}.btn:hover{filter:brightness(1.08)}.stats{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px;margin-bottom:28px}.stat{background:white;border:1px solid var(--line);border-radius:10px;padding:19px 22px}.stat-label{font-size:14px;color:var(--muted)}.stat-value{font-size:32px;font-weight:650;font-variant-numeric:tabular-nums;line-height:1.5}.stat-value small{font-size:14px;font-weight:400;color:var(--muted);margin-left:7px}.stat-note{font-size:13px;color:var(--muted)}.panel{background:white;border:1px solid var(--line);border-radius:10px;margin-bottom:24px;overflow:hidden}.panel-header{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:20px 24px;border-bottom:1px solid var(--line)}.panel-body{padding:24px}.two-col{display:grid;grid-template-columns:minmax(0,1.65fr) minmax(280px,1fr);gap:24px}.empty{text-align:center;padding:46px 22px;color:var(--muted)}.empty strong{display:block;color:var(--ink);font-size:17px;margin-bottom:8px}.notice{padding:14px 18px;background:#fbf7ec;border:1px solid #ebdfbf;color:#72591f;border-radius:8px;margin-bottom:24px;font-size:14px}.notice .text-btn{color:var(--navy);text-decoration:underline}.lecture-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px}.lecture-card{background:white;border:1px solid var(--line);border-radius:10px;overflow:hidden;display:flex;flex-direction:column}.lecture-cover{height:158px;background:var(--navy);padding:24px;position:relative;color:white;display:flex;align-items:flex-end;justify-content:space-between;overflow:hidden}.lecture-cover:before{content:"";position:absolute;width:210px;height:210px;border:1px solid #d2b87844;border-radius:50%;right:-55px;top:-65px}.lecture-cover:after{content:"";position:absolute;width:160px;height:160px;border:1px solid #ffffff15;border-radius:50%;right:-30px;top:-40px}.lecture-cover .code{font-family:"Avenir Next","Segoe UI",Arial,sans-serif;font-size:34px;letter-spacing:.04em;font-weight:700;font-variant-numeric:tabular-nums;line-height:1.2;z-index:1}.lecture-cover .category{position:absolute;top:20px;left:24px;font-size:13px;color:#d7c290}.play-icon{width:38px;height:38px;border-radius:50%;border:1px solid #ffffff60;display:grid;place-items:center;z-index:1}.lecture-body{padding:22px;flex:1;display:flex;flex-direction:column;gap:12px}.meta{color:var(--muted);font-size:13px;display:flex;gap:12px;align-items:center;flex-wrap:wrap}.lecture-body .btn{margin-top:auto;align-self:stretch}.badge{display:inline-flex;align-items:center;font-size:12px;line-height:1.5;border-radius:4px;padding:4px 9px;background:#edf1f6;color:#58677b;white-space:nowrap}.badge.green{background:#e8f3ee;color:var(--green)}.badge.orange{background:#fdf0df;color:var(--orange)}.badge.navy{background:#e9eff7;color:var(--navy)}.badge.red{background:#fbecef;color:var(--red)}.progressbar{height:6px;background:#e9edf3;border-radius:3px;overflow:hidden;margin:7px 0}.progressbar span{display:block;height:100%;background:var(--gold)}table{border-collapse:collapse;width:100%;font-size:14px}th{text-align:left;background:#f8f9fb;color:var(--muted);font-size:13px;font-weight:500}th,td{padding:16px 22px;border-bottom:1px solid var(--line);vertical-align:middle}tbody tr:last-child td{border-bottom:0}td strong{font-size:15px;font-weight:600}td small{display:block;color:var(--muted);font-size:12px;margin-top:3px}.table-wrap{overflow:auto}table .progressbar{min-width:88px}.table-link{color:var(--navy);font-weight:600;text-decoration:underline;text-underline-offset:4px}.timeline-row{display:flex;gap:16px;padding:18px 24px;border-bottom:1px solid var(--line);align-items:start}.timeline-row:last-child{border:0}.timeline-row .number{width:31px;height:31px;display:grid;place-items:center;background:#eef2f7;border-radius:50%;font-size:13px;flex:none;color:var(--navy)}.timeline-row .text{flex:1}.timeline-row p{margin:4px 0 0;font-size:14px;color:var(--muted)}.goal{padding:20px 24px;background:var(--navy);color:white;border-radius:9px;margin-bottom:24px;border-left:4px solid var(--gold)}.goal p{margin:5px 0 0;color:#cbd6e5;font-size:14px}.lesson-layout{display:grid;grid-template-columns:minmax(0,1.8fr) minmax(300px,1fr);gap:24px}.video-frame{aspect-ratio:16/9;background:#061b35;border-radius:9px;overflow:hidden;display:grid;place-items:center;color:#c4d2e3;margin-bottom:22px}video{display:block;width:100%;height:100%;background:#061b35}.video-empty{text-align:center;padding:24px}.steps{display:flex;gap:8px;flex-wrap:wrap;margin:18px 0}.step{padding:7px 10px;background:#f0f3f7;color:var(--muted);border-radius:5px;font-size:13px}.step.done{background:#e8f3ee;color:var(--green)}.field{display:grid;gap:7px;margin-bottom:18px}.field label{font-weight:600;font-size:14px}.field input,.field select,.field textarea{width:100%;border:1px solid #cdd6e2;border-radius:6px;padding:10px 12px;color:var(--ink);background:white}.field textarea{resize:vertical;min-height:120px}.field small{font-size:12px;color:var(--muted)}.field-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}.field input[type=checkbox]{width:auto}.actions{display:flex;gap:10px;justify-content:flex-end;flex-wrap:wrap}.prose{white-space:pre-wrap;overflow-wrap:anywhere;font-size:15px;line-height:1.9}.feedback{background:#f5f7fb;border-left:3px solid var(--gold);padding:18px;margin-top:18px;border-radius:0 6px 6px 0}.submission{padding:22px 24px;border-bottom:1px solid var(--line)}.submission:last-child{border:0}.submission-top{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:15px}.filterbar{display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin-bottom:22px}.filterbar input,.filterbar select{border:1px solid #ccd6e2;border-radius:6px;padding:9px 12px;background:white;min-width:200px}.tabs{display:flex;gap:8px;flex-wrap:wrap}.tabs button{font-size:14px;background:white;padding:8px 16px;border:1px solid #d1dae5;border-radius:6px;color:var(--muted)}.tabs button.active{background:var(--navy);color:white;border-color:var(--navy)}dialog{border:0;border-radius:12px;padding:0;width:620px;max-width:calc(100vw - 32px);max-height:calc(100vh - 50px);box-shadow:0 24px 70px #00102040;color:var(--ink)}dialog::backdrop{background:#0d203b80}dialog .dialog-head{padding:22px 26px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between}dialog .dialog-body{padding:24px 26px}.close-btn{border:0;background:#f0f3f7;border-radius:50%;width:32px;height:32px;font-size:20px;color:var(--muted)}#toast{position:fixed;bottom:26px;left:50%;transform:translateX(-50%);z-index:20;background:var(--deep);color:white;box-shadow:0 8px 20px #071e3d30;border-radius:8px;padding:12px 20px;max-width:90vw;display:none;font-size:14px}#toast.show{display:block}#toast.error{background:#9a2f3c}.login-page{min-height:100vh;display:grid;grid-template-columns:1.05fr 1fr;background:white}.login-brand{padding:70px 9%;background:var(--deep);color:white;display:flex;flex-direction:column;justify-content:center;position:relative;border-right:5px solid var(--gold)}.login-brand img{width:100%;max-width:430px}.login-brand h1{margin-top:68px;font-size:34px;line-height:1.9;font-weight:500}.login-brand p{color:#aebfd5;line-height:2;font-size:15px}.login-brand .login-foot{margin-top:65px;font-size:12px;color:#7b91ae;letter-spacing:.12em}.login-form{max-width:430px;width:100%;margin:auto;padding:50px 30px}.login-form h2{font-size:25px;margin:8px 0 12px}.login-form form{margin-top:32px}.login-form .btn{width:100%;margin-top:9px;padding:12px}.login-form .help{margin-top:25px;padding-top:20px;border-top:1px solid var(--line);font-size:13px;color:var(--muted)}.error-box{background:#fceef0;color:var(--red);padding:12px 16px;border-radius:6px;font-size:14px;margin-bottom:20px}.upload-meter{background:#eef2f7;border-radius:8px;padding:18px;margin-top:16px}.back-link{font-size:14px;color:var(--muted);display:inline-block;margin-bottom:22px}.mobile-brand{display:none}.dim{color:var(--muted)}.count{font-variant-numeric:tabular-nums}.test-tag{font-size:12px;color:var(--gold);margin-top:8px}
@media(min-width:1600px){.content{padding-top:44px}}@media(max-width:1150px){.shell{grid-template-columns:216px minmax(0,1fr)}.content{padding:28px}.topbar{padding:0 28px}.lecture-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.two-col,.lesson-layout{grid-template-columns:1fr}.stats{gap:12px}.stat{padding:17px}.sidebar{padding:28px 14px}}
@media(max-width:740px){.shell{display:block}.sidebar{position:static;height:auto;padding:18px 16px 8px}.brand{padding:0;border:0;margin:0}.brand img{width:188px}.brand p{display:none}.nav{display:flex;overflow-x:auto;margin-top:16px;gap:5px}.nav a{font-size:13px;white-space:nowrap;padding:10px}.nav svg{width:17px;height:17px}.nav a.active{box-shadow:inset 0 -2px var(--gold)}.side-bottom{display:none}.topbar{height:58px;padding:0 18px}.topbar .site-name{display:none}.user-tools{width:100%;justify-content:flex-end;gap:10px}.content{padding:24px 18px 42px}.page-heading{align-items:start}h1{font-size:24px}.page-heading .btn{padding:8px 12px;font-size:13px}.stats{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin-bottom:22px}.stat{padding:14px}.stat-value{font-size:27px}.lecture-grid{grid-template-columns:1fr}.panel-header,.panel-body{padding:18px}.timeline-row{padding:18px}.lecture-cover{height:155px}.field-row{grid-template-columns:1fr;gap:0}.login-page{grid-template-columns:1fr}.login-brand{padding:32px 25px;border-right:0;border-bottom:3px solid var(--gold)}.login-brand img{width:230px}.login-brand h1,.login-brand p,.login-brand .login-foot{display:none}.login-form{padding:40px 24px}.two-col,.lesson-layout{gap:0}th,td{padding:13px 16px}.submission{padding:18px}.filterbar input,.filterbar select{width:100%;min-width:0}.eyebrow{font-size:11px}}

progress.progressbar{display:block;width:100%;border:0;appearance:none}progress.progressbar::-webkit-progress-bar{background:#e9edf3;border-radius:3px}progress.progressbar::-webkit-progress-value{background:var(--gold);border-radius:3px}progress.progressbar::-moz-progress-bar{background:var(--gold);border-radius:3px}

.login-choice-label{font-size:13px;color:var(--muted);margin:0 0 10px}.login-tabs{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:4px;padding:5px;background:#f0f3f7;border:1px solid var(--line);border-radius:9px;margin-bottom:30px}.login-tabs button{border:1px solid transparent;border-radius:6px;background:transparent;color:var(--muted);font-size:14px;font-weight:600;padding:10px 6px;min-height:44px}.login-tabs button[aria-selected=true]{background:var(--navy);border-color:var(--navy);color:#fff;box-shadow:0 2px 5px #092b5718}.login-tabs button:hover:not([aria-selected=true]){background:#e4eaf2;color:var(--navy)}.login-tabs button:focus-visible{outline:2px solid var(--gold);outline-offset:2px}#login-description{min-height:50px}.login-form{max-width:470px}.login-form form{margin-top:26px}

.scope-badge{display:inline-flex;align-items:center;align-self:flex-start;font-size:12px;font-weight:650;line-height:1.5;padding:5px 10px;border:1px solid #d6e1ef;border-radius:5px;background:#edf2f8;color:var(--navy)}.scope-badge.personal{background:#eaf5ef;border-color:#c8e2d3;color:#205c3f}.scope-banner{display:flex;align-items:center;gap:15px;flex-wrap:wrap;padding:16px 20px;border:1px solid #c8e2d3;border-left:4px solid #327951;background:#f3faf6;border-radius:8px;margin-bottom:24px}.scope-banner.common{border-color:#d6e1ef;border-left-color:var(--navy);background:#f0f4f9}.scope-banner p{margin:0;font-size:14px;color:var(--muted)}.recording-cover{display:grid;gap:12px;padding:24px;background:#edf4f0;border-bottom:1px solid #dce8df;color:#205c3f;min-height:140px}.recording-cover span{font-size:13px}.recording-cover strong{font-size:23px;font-weight:600}.recording-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.recording-layout{display:grid;grid-template-columns:minmax(0,1.8fr) minmax(300px,1fr);gap:24px}@media(max-width:1000px){.recording-layout{grid-template-columns:1fr}}@media(max-width:740px){.recording-grid{grid-template-columns:1fr}.scope-banner{padding:14px}.recording-layout{gap:0}}

.mobile-menu-button{display:none}@media(max-width:740px){.mobile-menu-button{display:block;width:100%;margin-top:14px;padding:11px;border:1px solid #ffffff40;border-radius:6px;background:transparent;color:white;font:inherit;font-size:14px;text-align:left}.nav{display:none;overflow:visible}.nav.mobile-open{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:5px}.nav a{white-space:normal;min-height:44px}.page-heading{flex-wrap:wrap}.actions{justify-content:flex-start}}

/* Explicit playback controls for common lectures and private recordings. */
.video-toolbar{display:flex;align-items:center;gap:14px;flex-wrap:wrap;margin:-10px 0 22px;padding:12px 16px;background:white;border:1px solid var(--line);border-radius:8px}.video-toolbar-label{font-size:14px;font-weight:600;color:var(--ink)}.video-speed-buttons{display:flex;gap:7px;flex-wrap:wrap}.video-speed-btn{min-height:40px;padding:7px 14px;border:1px solid #cbd5e1;border-radius:6px;background:white;color:var(--navy);font-size:14px;font-weight:600}.video-speed-btn[aria-pressed="true"]{background:var(--navy);border-color:var(--navy);color:white}.video-speed-btn:hover{border-color:var(--gold)}.video-speed-btn:focus-visible{outline:3px solid var(--gold);outline-offset:3px}
@media(max-width:480px){.video-toolbar{padding:10px 12px;gap:8px}.video-speed-btn{padding:7px 12px;min-height:44px}}