*{box-sizing:border-box}html,body{max-width:100%;overflow-x:hidden}body{margin:0;background:#f4f7fa;color:#26374a;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Yu Gothic",Meiryo,sans-serif;line-height:1.7;overflow-wrap:anywhere;word-break:break-word}header{width:100%;background:#075fb9;color:#fff;padding:14px max(16px,calc((100% - 1100px)/2));display:flex;justify-content:space-between;align-items:center;gap:16px}header a{color:#fff;text-decoration:none;font-weight:800}.site-title{font-size:1.1rem;white-space:normal}nav{display:flex;gap:10px 18px;flex-wrap:wrap}main{width:100%;max-width:1100px;margin:30px auto;padding:0 16px;min-height:70vh}.panel,.course,.lessons article{width:100%;min-width:0;max-width:100%;background:#fff;border:1px solid #d5e0e9;border-radius:10px;padding:22px;box-shadow:0 6px 18px #173d5d12}.narrow{max-width:560px;margin:auto}h1,h2,p,a,span,strong,small,em{max-width:100%;overflow-wrap:anywhere;word-break:break-word}h1,h2{color:#104e7c;line-height:1.4}label{display:block;font-weight:800;margin:14px 0}input{display:block;width:100%;max-width:100%;padding:12px;border:1px solid #aebfce;border-radius:5px;font:inherit}button,.button{display:inline-block;max-width:100%;border:0;border-radius:6px;background:#075fb9;color:#fff;padding:11px 20px;font-weight:800;text-decoration:none;text-align:center;cursor:pointer;white-space:normal}.small{padding:8px 14px}.secondary{background:#fff;color:#075fb9;border:2px solid #075fb9}.danger{background:#b42318}.error{color:#b42318}.success{background:#ecf8ef;border-left:5px solid #26803d;padding:16px;margin:15px 0}.success.compact{padding:10px 14px}.warning{background:#fff6df;border-left:5px solid #ce7a00;padding:16px}.mail-ok,.field-complete{color:#21783a;font-weight:800}.student-id{font-size:1.35rem}.course-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,230px),1fr));gap:16px}.course h2{font-size:1.2rem}.course progress,progress{width:100%;max-width:100%;margin:10px 0 18px}.instructor{margin-bottom:20px}.lessons{display:grid;gap:12px;width:100%}.lessons article{display:grid;grid-template-columns:75px minmax(0,1fr) 65px minmax(110px,160px);align-items:center;gap:12px}.lessons article.completed{border-left:5px solid #26803d}.lesson-no{font-weight:800}.lesson-name{min-width:0;color:#173d5d}.lesson-name strong,.lesson-name small{display:block;white-space:normal}.lesson-name small{margin-top:4px;color:#596b7a;font-size:.84rem;font-weight:400;line-height:1.45}.lesson-status{text-align:center}.lesson-link{text-align:right}.lessons em{display:block;color:#687784;font-size:13px;line-height:1.4}.lesson-heading small{font-weight:800;color:#526b80}.back-link{display:inline-block;white-space:normal}video{display:block;width:100%;max-width:100%;height:auto;background:#111;max-height:70vh}.lesson-actions{display:flex;justify-content:space-between;align-items:center;gap:15px;margin-top:18px;flex-wrap:wrap}.lesson-actions form{margin:0}.note{font-size:.9rem;color:#596b7a}.table{width:100%;overflow-x:auto}table{width:100%;border-collapse:collapse;background:#fff}th,td{padding:10px;border:1px solid #d5e0e9;text-align:left;overflow-wrap:anywhere}footer{text-align:center;padding:24px 16px;background:#e8eef4;font-size:13px}@media(max-width:720px){header{display:block;padding:12px 14px}nav{margin-top:8px;font-size:13px;gap:8px 12px}main{margin:20px auto;padding:0 10px}.panel,.course,.lessons article{padding:15px}h1{font-size:1.45rem}.lessons article{grid-template-columns:58px minmax(0,1fr);gap:7px 9px}.lesson-status,.lesson-link{text-align:left}.lesson-link .button{width:100%}.lesson-actions{display:grid;grid-template-columns:minmax(0,1fr)}.lesson-actions>*{width:100%}.lesson-actions button,.lesson-actions .button{width:100%}}@media(max-width:380px){h1{font-size:1.3rem}.panel,.course,.lessons article{padding:12px}main{padding:0 7px}}