:root{--bg:#faf5ee;--sidebar-bg:#f3ebdd;--border:#e6dac4;--text:#2c2620;--text-muted:#7d7364;--accent:#c1622f;--accent-soft:#f2d9c4;--green:#4c7a52;--green-soft:#e0e8d8;--white:#fffdfa;--danger:#b3452f}*{box-sizing:border-box;margin:0;padding:0}body{font-family:Work Sans,sans-serif;background:var(--bg);color:var(--text);text-wrap:pretty}a{color:var(--accent)}a:hover{color:#a34f24}button{font-family:inherit;cursor:pointer}.app-shell{display:flex;flex-direction:column;min-height:100vh}.top-strip{display:flex;justify-content:space-between;align-items:center;padding:10px 28px;background:var(--white);border-bottom:1px solid var(--border);font-size:14px;color:var(--text-muted)}.top-strip.admin{background:#2c2620;color:#e9e2d4;border-bottom-color:#2c2620}.top-strip.admin .link-btn{color:#e9e2d4;text-decoration:underline}.top-strip-actions{display:flex;align-items:center;gap:16px}.link-btn{background:none;border:none;color:var(--accent);font-size:14px;font-weight:500;padding:0}.link-btn:hover{text-decoration:underline}.layout{display:flex;flex:1;min-height:0}.sidebar{width:310px;flex-shrink:0;background:var(--sidebar-bg);border-right:1px solid var(--border);overflow-y:auto;padding:28px 0 60px}.sidebar-head{padding:0 24px 20px;border-bottom:1px solid var(--border)}.sidebar-head h1{font-size:19px;font-weight:700;margin-bottom:14px}.overall-progress{display:flex;align-items:center;gap:10px}.overall-percent{font-size:13px;font-weight:700;color:var(--accent);width:32px}.bar-track{flex:1;height:6px;background:var(--accent-soft);border-radius:4px;overflow:hidden}.bar-track.small{height:5px}.bar-fill{height:100%;background:var(--accent);border-radius:4px}.lesson-count{font-size:13px;color:var(--text-muted);margin-top:8px}.chapter-block{padding:16px 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8px;border-radius:6px;flex-shrink:0}.sidebar-icon-btn:hover{background:#0000000f;color:var(--danger)}.sidebar-add-btn{width:100%;text-align:left;background:none;border:1px dashed var(--border);border-radius:8px;padding:8px 12px;font-size:13px;color:var(--text-muted);margin-top:6px}.sidebar-add-btn:hover{background:#00000008;color:var(--text)}.sidebar-add-chapter{padding:14px 12px 0}.sidebar-add-form{display:flex;flex-direction:column;gap:8px;padding:10px;margin-top:6px;background:var(--white);border:1px solid var(--border);border-radius:8px}.sidebar-add-form input,.sidebar-add-form select{border:1px solid var(--border);border-radius:6px;padding:7px 10px;font-family:inherit;font-size:13px;background:var(--bg)}.sidebar-add-actions{display:flex;gap:8px;align-items:center}.content-pane{flex:1;overflow-y:auto;padding:40px 48px 80px;max-width:900px}.breadcrumb{font-size:13px;color:var(--text-muted);margin-bottom:10px}.lesson-content h2{font-size:30px;font-weight:700;margin-bottom:10px}.lesson-subtitle{font-size:16px;color:var(--text-muted);margin-bottom:4px}.lesson-duration{font-size:13px;color:var(--text-muted);margin-bottom:28px}.lesson-head-row{display:flex;justify-content:space-between;align-items:flex-start;gap:16px}.edit-lesson-btn{display:flex;align-items:center;gap:6px;flex-shrink:0;white-space:nowrap}.lesson-editor{background:var(--white);border:1px solid var(--border);border-radius:12px;padding:24px;margin-top:8px;display:flex;flex-direction:column;gap:4px}.lesson-editor input,.lesson-editor .editor-textarea{border:1px solid var(--border);border-radius:8px;padding:9px 12px;font-family:inherit;font-size:14px;color:var(--text);background:var(--bg);width:100%}.editor-textarea{resize:vertical;min-height:80px}.editor-blocks{display:flex;flex-direction:column;gap:12px;margin:8px 0 16px}.editor-block-row{border:1px solid 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12px;display:flex;flex-direction:column;gap:4px}.admin-tab{display:flex;justify-content:space-between;align-items:center;background:none;border:none;text-align:left;padding:10px 14px;border-radius:8px;font-size:14px;font-weight:500;color:var(--text)}.admin-tab:hover{background:#0000000a}.admin-tab.active{background:var(--white);box-shadow:0 1px 3px #00000014;font-weight:600}.tab-badge{background:var(--accent);color:#fff;font-size:11px;font-weight:700;border-radius:10px;padding:1px 7px}.admin-main{flex:1;overflow-y:auto;padding:36px 44px}.admin-panel h3{font-size:20px;margin-bottom:18px}.admin-panel h3+h3{margin-top:32px}.empty-state{color:var(--text-muted);font-size:14px}.admin-table{width:100%;border-collapse:collapse;background:var(--white);border:1px solid var(--border);border-radius:10px;overflow:hidden}.admin-table th{text-align:left;font-size:12px;text-transform:uppercase;letter-spacing:.04em;color:var(--text-muted);padding:12px 16px;border-bottom:1px solid var(--border)}.admin-table td{padding:13px 16px;border-bottom:1px solid var(--border);font-size:14px;vertical-align:middle}.admin-table tr:last-child td{border-bottom:none}.row-actions{display:flex;gap:8px}.status-badge{font-size:12px;font-weight:600;padding:3px 10px;border-radius:20px}.status-badge.actif{background:var(--green-soft);color:var(--green)}.status-badge.termine{background:var(--accent-soft);color:var(--accent)}.status-badge.en_attente{background:#eee;color:var(--text-muted)}.progress-cell{display:flex;align-items:center;gap:10px;min-width:140px}.progress-cell .bar-track{width:80px}.detail-row td{background:var(--bg)}.chapter-detail-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;padding:6px 0}.chapter-detail-card{background:var(--white);border:1px solid var(--border);border-radius:10px;padding:14px}.chapter-detail-title{font-size:13px;font-weight:600;margin-bottom:8px}.chapter-detail-sub{font-size:12px;color:var(--text-muted);margin-top:6px}.message-list{display:flex;flex-direction:column;gap:14px}.message-card{background:var(--white);border:1px solid var(--border);border-radius:10px;padding:16px}.message-meta{font-size:12px;color:var(--text-muted);margin-bottom:6px;text-transform:uppercase;letter-spacing:.03em}.stat-cards{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-bottom:36px}.stat-card{background:var(--white);border:1px solid var(--border);border-radius:12px;padding:20px}.stat-value{font-size:30px;font-weight:700;color:var(--accent)}.stat-label{font-size:13px;color:var(--text-muted);margin-top:4px}.chapter-stat-list{display:flex;flex-direction:column;gap:14px}.chapter-stat-row{display:grid;grid-template-columns:1fr 3fr 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input{flex:1;padding-right:38px}.password-toggle{position:absolute;right:6px;top:50%;transform:translateY(-50%);background:none;border:none;padding:4px;display:flex;align-items:center;justify-content:center;color:var(--text-muted)}.password-toggle:hover{color:var(--text)}.auth-error{color:var(--danger);font-size:13px;margin-bottom:12px}.auth-switch{margin-top:16px;font-size:13px;color:var(--text-muted)}.auth-status-message{font-size:14px;line-height:1.6;color:var(--text-muted);margin:14px 0 20px}