@import"https://fonts.googleapis.com/css2?family=Nunito+Sans:opsz,wght@6..12,400;6..12,500;6..12,600;6..12,700;6..12,800&family=Noto+Sans+JP:wght@400;500;700&display=swap";:root{--bg-outer: #f0eff7;--bg-main: #ffffff;--text-primary: #111113;--text-sub: #8b8b96;--lavender: #eee7ff;--mint: #eafaf5;--pink-soft: #fdeeff;--cream: #faf7ec;--lavender-mid: #d9d0f5;--accent: #7f63d8;--accent-pink: #ef5aa8;--accent-yellow:#f6c45c;--accent-mint: #3dbf94;--border: 1px solid rgba(0, 0, 0, .05);--shadow: 0 20px 60px rgba(20, 20, 40, .06);--shadow-card: 0 4px 24px rgba(20, 20, 40, .05);--shadow-hover: 0 12px 40px rgba(20, 20, 40, .1);--r-outer: 32px;--r-card: 22px;--r-inner: 14px;--r-btn: 12px;--r-pill: 999px;--sidebar-w: 72px;--font: "Nunito Sans", "Noto Sans JP", sans-serif;--ink: #111113;--paper: #ffffff;--card: #ffffff;--line: rgba(0, 0, 0, .06);--soft-line: rgba(0, 0, 0, .04);--muted: #8b8b96;--accent2: #ef5aa8;--accent3: #3d3060;--logo-hi: #c9b8f5;--accent-soft: #fdeeff;--radius: var(--r-inner)}*,*:before,*:after{box-sizing:border-box}body{margin:0;background:var(--bg-outer);color:var(--text-primary);font-family:var(--font);font-weight:500;font-size:15px;line-height:1.75;-webkit-font-smoothing:antialiased}button,input,textarea,select{font:inherit}button{cursor:pointer}:focus-visible{outline:2px solid var(--accent);outline-offset:3px}.skip-link{position:absolute;top:-100px;left:12px;z-index:1000;background:var(--accent);color:#fff;padding:9px 16px;border-radius:var(--r-pill)}.skip-link:focus{top:12px}.app-shell{min-height:100vh;display:flex;flex-direction:column}.app-shell--auth{flex-direction:row;align-items:stretch}.sidebar-nav{width:var(--sidebar-w);min-height:100vh;height:100%;position:sticky;top:0;flex-shrink:0;background:var(--bg-main);border-right:var(--border);display:flex;flex-direction:column;align-items:center;padding:20px 0 24px;gap:6px;z-index:50}.sidebar-logo-btn{width:40px;height:40px;background:var(--lavender);border:0;border-radius:var(--r-inner);display:flex;align-items:center;justify-content:center;margin-bottom:16px;color:var(--accent);flex-shrink:0;transition:background .18s,transform .18s}.sidebar-logo-btn:hover{background:var(--lavender-mid);transform:scale(1.06)}.sidebar-menu{display:flex;flex-direction:column;align-items:center;gap:4px;flex:1}.sidebar-icon{width:42px;height:42px;background:transparent;border:0;border-radius:var(--r-inner);display:flex;align-items:center;justify-content:center;color:var(--text-sub);transition:background .18s,color .18s,transform .15s;position:relative}.sidebar-icon:hover{background:var(--lavender);color:var(--accent);transform:scale(1.08)}.sidebar-icon.active{background:var(--lavender);color:var(--accent)}.sidebar-spacer{flex:1}.sidebar-avatar{width:38px;height:38px;border-radius:50%;background:var(--lavender);color:var(--accent);border:0;font-size:13px;font-weight:700;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:transform .18s,box-shadow .18s;overflow:hidden;margin-top:8px}.sidebar-avatar:hover{transform:scale(1.1);box-shadow:0 4px 16px #7f63d840}.sidebar-avatar.active{box-shadow:0 0 0 2px var(--accent),0 4px 16px #7f63d840;transform:scale(1.05)}.main-content{flex:1;min-height:100vh;min-width:0}.page{width:min(1100px,100%);margin:0 auto;padding:40px 36px}.page-title{margin:0 0 4px;font-size:28px;font-weight:800;line-height:1.25;color:var(--text-primary)}.page-sub{margin:0 0 32px;color:var(--text-sub);font-size:14px;font-weight:500}.auth-wrap{min-height:100vh;display:grid;place-items:center;padding:28px 16px;background:var(--bg-outer)}.auth-card{width:min(460px,100%);padding:40px;background:var(--bg-main);border-radius:var(--r-outer);box-shadow:var(--shadow);border:var(--border)}.auth-title{margin:0 0 8px;font-size:26px;font-weight:800;color:var(--text-primary)}.auth-sub{color:var(--text-sub);margin:0 0 28px;font-size:14px}.form-group{margin-bottom:18px}.form-label{display:block;font-size:13px;font-weight:700;margin-bottom:7px;color:var(--text-primary)}.req{color:var(--accent-pink);margin-left:4px}.form-input{width:100%;border:var(--border);border-radius:var(--r-inner);background:#f8f7fc;padding:10px 14px;font-size:14px;color:var(--text-primary);transition:border-color .18s,box-shadow .18s}.form-input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px #7f63d81f;background:#fff}textarea.form-input{min-height:120px;resize:vertical}.form-error{color:var(--accent-pink);font-size:12px;margin:6px 0 0}.btn-primary,.btn-secondary,.btn-small,.btn-danger{border:0;border-radius:var(--r-btn);font-weight:700;transition:transform .15s,box-shadow .15s,background .15s}.btn-primary{width:100%;background:var(--accent);color:#fff;padding:13px 16px;font-size:15px;border-radius:var(--r-inner)}.btn-primary:hover{background:#6e52c5;transform:translateY(-1px);box-shadow:0 6px 20px #7f63d847}.btn-secondary{background:var(--bg-main);color:var(--text-primary);border:var(--border);padding:10px 16px;font-size:14px}.btn-secondary:hover{border-color:#00000026;transform:translateY(-1px);box-shadow:var(--shadow-card)}.btn-small{background:var(--accent);color:#fff;padding:8px 14px;font-size:13px}.btn-small:hover{background:#6e52c5;transform:translateY(-1px);box-shadow:0 4px 14px #7f63d840}.btn-small:disabled,.btn-secondary:disabled{opacity:.5;cursor:not-allowed;transform:none;box-shadow:none}.btn-danger{background:#fff4f8;color:var(--accent-pink);border:1px solid rgba(239,90,168,.18);padding:7px 12px;font-size:12px}.btn-danger:hover{background:#ffe8f3;transform:translateY(-1px)}.auth-link{text-align:center;margin-top:20px;font-size:13px;color:var(--text-sub)}.link-btn{border:0;background:none;color:var(--accent);text-decoration:underline;padding:0;font-weight:600}.demo-section{margin-top:24px;padding-top:20px;border-top:var(--border)}.demo-label{font-size:11px;font-weight:700;color:var(--text-sub);text-transform:uppercase;letter-spacing:.08em;margin:0 0 10px}.demo-btns{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:8px}.demo-btn{text-align:left;border:var(--border);background:#f8f7fc;border-radius:var(--r-inner);padding:10px 12px;transition:background .15s,transform .15s}.demo-btn:hover{background:var(--lavender);transform:translateY(-1px)}.demo-btn strong,.demo-btn span{display:block}.demo-btn span{color:var(--text-sub);font-size:11px;margin-top:2px}.alert{padding:11px 16px;border-radius:var(--r-inner);margin-bottom:16px;font-size:13px;font-weight:600;border-left:4px solid}.alert-error{background:#fff4f8;color:var(--accent-pink);border-color:var(--accent-pink)}.alert-success{background:var(--mint);color:#1a8063;border-color:var(--accent-mint)}.header{display:none}.stats-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:16px;margin-bottom:32px}.stat-card{padding:22px 20px;background:var(--bg-main);border-radius:var(--r-card);border:var(--border);box-shadow:var(--shadow-card);transition:transform .2s,box-shadow .2s}.stat-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-hover)}.stat-card.accent{background:var(--lavender);border-color:var(--lavender-mid)}.stat-num{font-size:34px;font-weight:800;line-height:1;color:var(--text-primary)}.stat-card.accent .stat-num{color:var(--accent)}.stat-label{color:var(--text-sub);font-size:12px;font-weight:600;margin-top:6px}.stat-card.accent .stat-label{color:var(--accent);opacity:.75}.course-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(288px,1fr));gap:20px;list-style:none;margin:0;padding:0}.course-card{background:var(--bg-main);border:var(--border);border-radius:var(--r-card);box-shadow:var(--shadow-card);overflow:hidden;display:flex;flex-direction:column;transition:transform .22s,box-shadow .22s}.course-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover)}.thumbnail-art{position:relative;overflow:hidden;color:#fff;isolation:isolate}.thumbnail-art:before{content:"";position:absolute;inset:0;background:linear-gradient(135deg,#ffffff2e,#fff0 46%),radial-gradient(circle at 78% 22%,rgba(255,255,255,.22),transparent 28%),repeating-linear-gradient(135deg,rgba(255,255,255,.06) 0 2px,transparent 2px 11px);z-index:-1}.thumbnail-art img{width:100%;aspect-ratio:16/9;height:100%;object-fit:cover;display:block}.thumbnail-art.course{aspect-ratio:16/9;display:flex;flex-direction:column;justify-content:flex-end;padding:16px 18px}.thumbnail-art.lesson{width:168px;min-height:132px;height:100%;display:flex;flex-direction:column;justify-content:flex-end;padding:14px;justify-self:end}.thumbnail-art.tone-0{background:linear-gradient(135deg,#a78bfa,#7c3aed)}.thumbnail-art.tone-1{background:linear-gradient(135deg,#f472b6,#be185d)}.thumbnail-art.tone-2{background:linear-gradient(135deg,#6ee7b7,#059669)}.thumbnail-art.tone-3{background:linear-gradient(135deg,#fcd34d,#d97706)}.thumbnail-art.tone-4{background:linear-gradient(135deg,#93c5fd,#2563eb)}.thumbnail-art.tone-5{background:linear-gradient(135deg,#fdba74,#ea580c)}.thumbnail-kicker{font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.06em;opacity:.8}.thumbnail-title{display:block;font-size:20px;font-weight:800;line-height:1.2;margin-top:4px;overflow-wrap:anywhere}.course-head{padding:18px 20px 14px;border-bottom:var(--border)}.course-meta{display:flex;gap:6px;flex-wrap:wrap;align-items:center;margin-bottom:8px}.pill{display:inline-flex;align-items:center;padding:3px 10px;border-radius:var(--r-pill);font-size:11px;font-weight:700;background:var(--lavender);color:var(--accent)}.pill.admin{background:#fff4f8;color:var(--accent-pink)}.pill.developer{background:var(--lavender);color:var(--accent)}.pill.done{background:var(--mint);color:#1a8063}.pill.progress{background:#fff4f8;color:var(--accent-pink)}.pill.pending{background:#fff8ec;color:#b45309}.course-title{font-size:18px;font-weight:800;margin:0;color:var(--text-primary)}.course-desc{color:var(--text-sub);font-size:13px;margin:6px 0 0}.course-body{padding:16px 20px 20px;flex:1;display:flex;flex-direction:column;gap:14px}.progress-wrap{height:6px;background:var(--lavender);border-radius:var(--r-pill);overflow:hidden}.progress-fill{height:100%;background:var(--accent);border-radius:var(--r-pill);transition:width .5s ease}.lesson-list{display:grid;gap:14px}.lesson-card{background:var(--bg-main);border:var(--border);border-radius:var(--r-card);box-shadow:var(--shadow-card);padding:20px;display:grid;grid-template-columns:minmax(0,1fr) 168px;gap:14px;align-items:stretch;transition:transform .2s,box-shadow .2s}.lesson-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-hover)}.lesson-content{min-width:0;display:grid;gap:10px;align-content:start}.lesson-card h3{margin:0;font-size:17px;font-weight:700;color:var(--text-primary)}.lesson-card p{margin:0;color:var(--text-sub);font-size:13px}.lesson-actions{display:flex;gap:8px;flex-wrap:wrap;align-items:center}.course-layout{display:grid;grid-template-columns:minmax(0,1fr) 380px;gap:24px;align-items:start}.outline-layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:24px;align-items:start}.sidebar{position:sticky;top:32px;display:grid;gap:16px}.breadcrumb{display:flex;gap:8px;align-items:center;color:var(--text-sub);font-size:13px;margin-bottom:20px;flex-wrap:wrap}.video-frame{background:#1a1030;border-radius:var(--r-card);aspect-ratio:16/9;overflow:hidden;margin-bottom:14px;box-shadow:var(--shadow)}.video-frame iframe,.video-frame video{width:100%;height:100%;border:0;display:block}.video-empty{height:100%;display:grid;place-items:center;color:#ffffff80;text-align:center;padding:18px}.panel{background:var(--bg-main);border:var(--border);border-radius:var(--r-card);box-shadow:var(--shadow-card);padding:22px}.panel h2,.quiz-card h2{font-size:17px;font-weight:700;margin:0 0 14px;padding-bottom:10px;border-bottom:var(--border)}.rich-text p{margin:0 0 12px}.rich-text ul{margin:8px 0 0 20px;padding:0}.rich-text strong{color:var(--accent)}.quiz-card{background:var(--bg-main);border:var(--border);border-radius:var(--r-card);box-shadow:var(--shadow-card);padding:22px}.quiz-options{display:grid;gap:8px;margin-top:12px}.quiz-option{border:var(--border);background:#f8f7fc;border-radius:var(--r-inner);padding:11px 14px;text-align:left;font-size:14px;transition:background .15s,border-color .15s}.quiz-option:hover:not(:disabled){background:var(--lavender);border-color:var(--lavender-mid)}.quiz-option.selected{border-color:var(--accent);background:var(--lavender)}.quiz-option.correct{background:var(--mint);border-color:var(--accent-mint)}.quiz-option.wrong{background:#fff4f8;border-color:var(--accent-pink)}.feedback{margin-top:12px;border:var(--border);border-radius:var(--r-inner);padding:12px 14px;font-size:13px;background:#f8f7fc}.work-status{font-size:13px;color:var(--text-sub);margin:0 0 10px}.tabs{display:flex;gap:4px;flex-wrap:wrap;border-bottom:var(--border);margin-bottom:24px}.tab-btn{border:0;border-bottom:2px solid transparent;background:transparent;padding:10px 16px;font-weight:700;font-size:14px;color:var(--text-sub);margin-bottom:-1px;border-radius:var(--r-inner) var(--r-inner) 0 0;transition:color .15s,background .15s}.tab-btn:hover{color:var(--text-primary);background:var(--lavender)}.tab-btn.active{color:var(--accent);border-bottom-color:var(--accent)}.table-wrap{overflow:auto;background:var(--bg-main);border:var(--border);border-radius:var(--r-card);box-shadow:var(--shadow-card)}.progress-sequence{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:8px;min-width:360px}.lesson-progress-cell{border:var(--border);background:#f8f7fc;border-radius:var(--r-inner);padding:10px 12px;display:grid;gap:5px;align-content:start}.lesson-progress-cell strong{font-size:13px;line-height:1.35}table{border-collapse:collapse;width:100%;font-size:14px}th{background:var(--lavender);color:var(--accent);text-align:left;padding:11px 14px;white-space:nowrap;border-bottom:var(--border);font-size:12px;font-weight:700;letter-spacing:.03em}td{border-bottom:var(--border);padding:11px 14px;vertical-align:top;font-size:13px}tr:last-child td{border-bottom:0}tr:hover td{background:#faf9fd}.section-heading{font-size:20px;font-weight:800;margin:0 0 12px;color:var(--text-primary)}.toolbar{display:flex;justify-content:space-between;gap:12px;align-items:center;margin-bottom:16px;flex-wrap:wrap}.modal-overlay{position:fixed;inset:0;background:#0a081473;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:100;display:grid;place-items:center;padding:18px}.modal{width:min(620px,100%);max-height:90vh;overflow:auto;padding:28px;background:var(--bg-main);border-radius:var(--r-outer);box-shadow:var(--shadow);border:var(--border)}.modal h2{margin:0 0 20px;font-size:19px;font-weight:800}.modal-actions{display:flex;gap:8px;justify-content:flex-end;margin-top:20px;flex-wrap:wrap}.two-col{display:grid;grid-template-columns:1fr 1fr;gap:16px}.material-layout{display:grid;grid-template-columns:minmax(220px,320px) minmax(0,1fr);gap:16px;align-items:start}.access-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:8px}.access-grid.compact{grid-template-columns:repeat(auto-fit,minmax(160px,1fr))}.check-row{display:grid;grid-template-columns:auto minmax(0,1fr);gap:8px;align-items:center;border:var(--border);background:#f8f7fc;border-radius:var(--r-inner);padding:10px 12px}.check-row .work-status{grid-column:2;margin:-4px 0 0}.inline-actions{display:flex;gap:8px;align-items:center;flex-wrap:wrap}.question-editor{border:var(--border);border-radius:var(--r-card);padding:18px;background:#f8f7fc}.mentor-card{position:sticky;top:32px;display:grid;gap:16px}.mentor-profile{display:flex;gap:14px;align-items:flex-start}.mentor-avatar{width:50px;height:50px;border-radius:50%;background:var(--lavender);color:var(--accent);display:grid;place-items:center;flex:0 0 auto;overflow:hidden;font-size:17px;font-weight:800}.mentor-avatar img{width:100%;height:100%;object-fit:cover;display:block}.mentor-name{margin:0;font-size:18px;font-weight:800;line-height:1.2}.mentor-intro{margin:4px 0 0;color:var(--text-sub);font-size:13px}.mentor-message{min-height:96px}.empty{color:var(--text-sub);text-align:center;padding:40px 16px;font-size:14px}.stack{display:grid;gap:16px}.attachment-box{margin:10px 0;padding:12px 14px;background:var(--lavender);border:var(--border);border-radius:var(--r-inner);display:grid;gap:8px}.attachment-link{color:var(--accent);word-break:break-all;font-size:13px;font-weight:600}.thumbnail-preview{width:100%;max-height:180px;object-fit:cover;border-radius:var(--r-inner);display:block;margin-top:8px}.page-greeting{display:flex;align-items:flex-start;justify-content:space-between;margin-bottom:32px;gap:16px;flex-wrap:wrap}.page-greeting-text h1{margin:0 0 4px;font-size:28px;font-weight:800;color:var(--text-primary)}.page-greeting-text p{margin:0;color:var(--text-sub);font-size:14px}.page-greeting-actions{display:flex;align-items:center;gap:10px;flex-shrink:0}.icon-btn{width:40px;height:40px;border:var(--border);background:var(--bg-main);border-radius:var(--r-inner);display:flex;align-items:center;justify-content:center;color:var(--text-sub);position:relative;transition:background .15s,transform .15s}.icon-btn:hover{background:var(--lavender);color:var(--accent);transform:scale(1.06)}.notif-badge{position:absolute;top:-4px;right:-4px;background:var(--accent-pink);color:#fff;font-size:10px;font-weight:700;min-width:18px;height:18px;border-radius:var(--r-pill);display:flex;align-items:center;justify-content:center;padding:0 4px}.badge{background:var(--accent-pink);color:#fff;border-radius:var(--r-pill);padding:1px 7px;font-size:11px;font-weight:700;margin-left:5px}@media(max-width:900px){.app-shell--auth{flex-direction:column}.sidebar-nav{width:100%;min-height:auto;height:auto;position:fixed;inset:auto 0 0;flex-direction:row;justify-content:space-around;padding:10px 16px;border-right:0;border-top:var(--border);z-index:100}.sidebar-logo-btn{margin-bottom:0}.sidebar-spacer{display:none}.sidebar-menu{flex-direction:row;gap:4px;flex:0}.main-content{min-height:calc(100vh - 68px)}.page{padding:24px 16px 88px}.course-layout,.outline-layout,.two-col,.material-layout,.lesson-card{grid-template-columns:1fr}.thumbnail-art.lesson{width:100%;min-height:0;aspect-ratio:16/9;grid-row:1}.sidebar,.mentor-card{position:static}.course-grid{grid-template-columns:1fr}}@media(max-width:600px){.stats-row{grid-template-columns:1fr 1fr}.auth-card{padding:28px 20px}}