:root{--brand: #006b63;--brand-dark: #00524c;--accent: #04f2c1;--accent-soft: #e0f7fa;--bg: #f5f7f7;--surface: #ffffff;--border: #e3e8e8;--text: #1f2933;--muted: #6b7280;--danger: #c62828;--danger-soft: #fdecea;--warning: #b26a00;--warning-soft: #fff4e5;--success: #2e7d32;--success-soft: #e8f5e9;--radius: 10px;font-family:Segoe UI,system-ui,-apple-system,Roboto,Arial,sans-serif;color:var(--text);background:var(--bg)}*{box-sizing:border-box}body{margin:0;min-height:100vh}a{color:var(--brand)}h1,h2,h3{margin:0;color:var(--brand)}.layout{display:flex;min-height:100vh}.sidebar{width:230px;flex-shrink:0;background:var(--brand);color:#fff;display:flex;flex-direction:column;padding:20px 14px;gap:4px}.sidebar-logo{font-size:22px;font-weight:800;padding:0 10px 18px;letter-spacing:.5px}.sidebar-logo span{color:var(--accent)}.sidebar a{color:#d9f5f1;text-decoration:none;padding:10px 12px;border-radius:8px;font-weight:600}.sidebar a:hover{background:#ffffff14}.sidebar a.active{background:var(--accent);color:var(--brand-dark)}.sidebar-footer{margin-top:auto;padding:10px;font-size:13px;color:#c4ebe6;display:flex;flex-direction:column;gap:8px}.main{flex:1;min-width:0;display:flex;flex-direction:column}.topbar{display:flex;align-items:center;justify-content:flex-end;gap:10px;padding:12px 28px;background:var(--surface);border-bottom:1px solid var(--border)}.content{padding:24px 28px 60px;max-width:1400px;width:100%}.page-header{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:20px}.page-header p{margin:4px 0 0;color:var(--muted)}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:18px;margin-bottom:18px}.card h3{font-size:16px;margin-bottom:12px}.grid-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.grid-4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}.field{display:flex;flex-direction:column;gap:6px;margin-bottom:14px}.field label{font-size:13px;font-weight:600;color:#374151}.field .hint{font-size:12px;color:var(--muted)}input[type=text],input[type=email],input[type=password],input[type=number],input[type=url],select,textarea{font:inherit;font-size:14px;padding:9px 11px;border:1px solid var(--border);border-radius:8px;background:#fff;color:var(--text);width:100%}textarea{resize:vertical;min-height:90px}input:focus,select:focus,textarea:focus{outline:2px solid var(--accent);border-color:var(--brand)}.btn{font:inherit;font-size:14px;font-weight:600;border:1px solid transparent;border-radius:8px;padding:9px 16px;cursor:pointer;background:var(--brand);color:#fff;display:inline-flex;align-items:center;gap:6px;text-decoration:none;white-space:nowrap}.btn:hover{background:var(--brand-dark)}.btn:disabled{opacity:.55;cursor:not-allowed}.btn-secondary{background:#fff;color:var(--brand);border-color:var(--brand)}.btn-secondary:hover{background:var(--accent-soft)}.btn-danger{background:var(--danger-soft);color:var(--danger)}.btn-danger:hover{background:#f9d6d2}.btn-small{padding:5px 10px;font-size:13px}.btn-link{background:none;border:none;color:inherit;padding:0;cursor:pointer;font:inherit;text-decoration:underline}.table{width:100%;border-collapse:collapse;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden}.table th,.table td{text-align:left;padding:11px 14px;border-bottom:1px solid var(--border);font-size:14px;vertical-align:middle}.table th{background:#f0f6f5;color:var(--brand);font-weight:700;font-size:13px}.table tr:last-child td{border-bottom:none}.table .actions{display:flex;gap:6px;justify-content:flex-end}.toolbar{display:flex;gap:10px;margin-bottom:14px;flex-wrap:wrap}.toolbar input,.toolbar select{max-width:280px}.badge{display:inline-block;font-size:11px;font-weight:700;padding:3px 8px;border-radius:6px;background:var(--accent-soft);color:var(--brand)}.badge-muted{background:#f3f4f6;color:var(--muted)}.alert{padding:10px 14px;border-radius:8px;margin-bottom:14px;font-size:14px}.alert-error{background:var(--danger-soft);color:var(--danger)}.alert-warning{background:var(--warning-soft);color:var(--warning)}.alert-success{background:var(--success-soft);color:var(--success)}.muted{color:var(--muted)}.empty{padding:40px;text-align:center;color:var(--muted);background:var(--surface);border:1px dashed var(--border);border-radius:var(--radius)}.spinner{width:22px;height:22px;border:3px solid var(--accent-soft);border-top-color:var(--brand);border-radius:50%;animation:spin .8s linear infinite;display:inline-block}.center{display:flex;align-items:center;justify-content:center;padding:40px;gap:10px}@keyframes spin{to{transform:rotate(360deg)}}.auth-page{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--brand) 0%,#00897b 100%);padding:20px}.auth-card{width:100%;max-width:400px;background:#fff;border-radius:14px;padding:32px;box-shadow:0 10px 40px #00000026}.auth-card h1{font-size:24px;margin-bottom:6px}.auth-card p{color:var(--muted);margin:0 0 22px;font-size:14px}.auth-card .btn{width:100%;justify-content:center;padding:11px}.otp-input{font-size:22px!important;letter-spacing:8px;text-align:center}.editor-layout{display:grid;grid-template-columns:minmax(0,1fr) 360px;gap:20px;align-items:start}.sticky{position:sticky;top:20px}.form-actions{display:flex;gap:10px;justify-content:flex-end;position:sticky;bottom:0;background:var(--bg);padding:14px 0;border-top:1px solid var(--border)}.rte{border:1px solid var(--border);border-radius:var(--radius);background:#fff}.rte-toolbar{display:flex;flex-wrap:wrap;gap:4px;padding:8px;border-bottom:1px solid var(--border);background:#fafbfb;border-radius:var(--radius) var(--radius) 0 0;position:sticky;top:0;z-index:2}.rte-toolbar button{font:inherit;font-size:13px;min-width:32px;height:32px;padding:0 8px;border:1px solid transparent;border-radius:6px;background:transparent;cursor:pointer;color:#374151}.rte-toolbar button:hover{background:#eef2f2}.rte-toolbar button.is-active{background:var(--accent-soft);border-color:var(--brand);color:var(--brand)}.rte-toolbar .sep{width:1px;background:var(--border);margin:4px}.rte-content .ProseMirror{min-height:420px;padding:18px 22px;outline:none;font-size:15px;line-height:1.65}.rte-content .ProseMirror p.is-editor-empty:first-child:before{content:attr(data-placeholder);color:#9ca3af;float:left;height:0;pointer-events:none}.lesson-html h1{font-size:24px;margin:18px 0 8px}.lesson-html h2{font-size:20px;margin:16px 0 8px}.lesson-html h3{font-size:17px;margin:14px 0 6px}.lesson-html p{margin:0 0 10px}.lesson-html img{max-width:100%;height:auto;border-radius:8px;display:block;margin:10px 0}.lesson-html img.ProseMirror-selectednode{outline:3px solid var(--accent)}.lesson-html blockquote{border-left:4px solid var(--accent);margin:10px 0;padding:6px 14px;background:#f4fbfa;color:#374151}.lesson-html table{border-collapse:collapse;width:100%;margin:10px 0;table-layout:fixed}.lesson-html td,.lesson-html th{border:1px solid #cfd8d8;padding:6px 8px;vertical-align:top;min-width:60px}.lesson-html th{background:#f0f6f5;font-weight:700}.lesson-html .selectedCell{background:#04f2c126}.phone{width:340px;border:10px solid #1f2933;border-radius:36px;background:#fff;overflow:hidden;box-shadow:0 10px 30px #0000001f}.phone-screen{height:620px;overflow-y:auto;padding:16px;font-size:14px;line-height:1.55}.phone-title{font-size:19px;font-weight:800;color:var(--brand);margin-bottom:8px}.phone-cover{width:100%;border-radius:10px;margin-bottom:10px}.video-frame{width:100%;aspect-ratio:16 / 9;border:0;border-radius:8px;margin-bottom:10px}.quiz-question{border:1px solid var(--border);border-radius:var(--radius);padding:14px;margin-bottom:12px;background:#fbfdfd}.quiz-question-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px;font-weight:700;color:var(--brand)}.quiz-option{display:flex;align-items:center;gap:10px;margin-bottom:8px}.quiz-option input[type=radio]{width:18px;height:18px;accent-color:var(--brand)}.pick-list{max-height:320px;overflow-y:auto;border:1px solid var(--border);border-radius:8px}.pick-item{display:flex;align-items:center;gap:10px;padding:8px 12px;border-bottom:1px solid #f1f4f4;font-size:14px}.pick-item:last-child{border-bottom:none}.ordered-item{display:flex;align-items:center;gap:8px;padding:8px 10px;border:1px solid var(--border);border-radius:8px;margin-bottom:6px;background:#fff;font-size:14px}.ordered-item .num{font-weight:700;color:var(--brand);width:22px}.ordered-item .grow{flex:1}.modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000059;display:flex;align-items:center;justify-content:center;z-index:50}.modal{background:#fff;border-radius:12px;padding:22px;width:100%;max-width:440px}.modal h3{margin-bottom:8px}.modal p{color:#374151;font-size:14px}.modal-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:18px}@media(max-width:1100px){.editor-layout{grid-template-columns:1fr}.grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}}