:root{--navy:#0c315d;--blue:#1c64a8;--ink:#172e49;--muted:#617286;--line:#d8e2ec;--bg:#f3f6f9;--white:#fff;--green:#24743a;--red:#a5312a;--shadow:0 12px 28px rgba(12,49,93,.10)}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.5 system-ui,-apple-system,"Segoe UI",sans-serif}button,input,textarea,select{font:inherit}button{cursor:pointer}a{color:var(--blue)}code{background:#edf2f7;padding:.1em .3em;border-radius:5px}.eyebrow{margin:0 0 5px;color:var(--blue);font-size:11px;font-weight:900;text-transform:uppercase;letter-spacing:.12em}.small{font-size:12px;color:var(--muted)}
.auth-page{min-height:100vh;display:grid;place-items:center;padding:20px}.auth-card{width:min(480px,100%);padding:25px;border:1px solid var(--line);border-radius:18px;background:#fff;box-shadow:var(--shadow)}.auth-card h1{margin:0 0 10px;font:800 34px Georgia}.auth-card form{display:grid;gap:13px;margin-top:18px}.auth-card label{display:grid;gap:5px;font-weight:800}.auth-card input{padding:11px;border:1px solid var(--line);border-radius:10px}.alert{padding:10px 12px;border-radius:10px}.alert.error{background:#fdeaea;color:var(--red)}
.button{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:9px 12px;border:1px solid #cbd7e3;border-radius:10px;background:#fff;color:var(--navy);font-weight:800;text-decoration:none}.button.primary{background:var(--navy);border-color:var(--navy);color:#fff}.button.danger{color:var(--red);border-color:#e5bcb7}.button.small{padding:6px 8px;font-size:12px}.button:disabled{opacity:.45;cursor:not-allowed}
.admin-top{position:sticky;top:0;z-index:20;display:flex;justify-content:space-between;gap:18px;align-items:center;padding:13px 20px;background:#fff;border-bottom:1px solid var(--line);box-shadow:0 4px 14px rgba(12,49,93,.06)}.admin-top h1{margin:0;font:800 27px Georgia}.admin-top nav{display:flex;gap:8px}.admin-shell{display:grid;grid-template-columns:280px minmax(0,1fr);min-height:calc(100vh - 80px)}.admin-sidebar{position:sticky;top:80px;align-self:start;height:calc(100vh - 80px);overflow:auto;padding:14px;background:#fff;border-right:1px solid var(--line)}.sidebar-actions{display:grid;gap:7px;margin-bottom:13px}.chapter-list{display:grid;gap:6px}.chapter-button{width:100%;padding:10px;border:1px solid var(--line);border-radius:10px;background:#fbfdff;text-align:left;color:var(--ink)}.chapter-button.active{background:#eaf3fc;border-color:#8db1d5;color:var(--navy)}.chapter-button strong{display:block}.chapter-button small{display:block;color:var(--muted)}.admin-main{padding:16px 18px 35px;min-width:0}.status-bar{position:sticky;top:82px;z-index:10;padding:9px 12px;margin-bottom:12px;border:1px solid var(--line);border-radius:10px;background:#fff;color:var(--muted)}.status-bar.ok{background:#e8f5ea;color:var(--green)}.status-bar.error{background:#fdeaea;color:var(--red)}
.editor-header,.editor-section{padding:16px 17px;margin-bottom:13px;border:1px solid var(--line);border-radius:15px;background:#fff;box-shadow:0 6px 18px rgba(12,49,93,.04)}.editor-header{display:flex;justify-content:space-between;gap:12px;align-items:flex-start}.editor-header h2{margin:0;font:800 31px Georgia}.editor-section h3{margin:0 0 12px;font:800 23px Georgia}.editor-section h4{margin:0 0 9px;color:var(--navy)}.field-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.field-grid.three{grid-template-columns:repeat(3,minmax(0,1fr))}.field{display:grid;gap:4px}.field.full{grid-column:1/-1}.field label{font-size:12px;font-weight:850;color:#314a64}.field input,.field textarea,.field select{width:100%;padding:9px 10px;border:1px solid var(--line);border-radius:9px;background:#fff;color:var(--ink)}.field textarea{min-height:100px;resize:vertical}.field textarea.tall{min-height:210px}.field .checkbox-field{display:flex;align-items:center;gap:8px;min-height:42px;padding:9px;border:1px solid var(--line);border-radius:9px;background:#fff}.field .checkbox-field input{width:auto;margin:0;accent-color:var(--navy)}.hint{font-size:11px;color:var(--muted)}.toolbar{display:flex;gap:7px;align-items:center;flex-wrap:wrap}.item-card{margin-top:10px;border:1px solid var(--line);border-radius:13px;background:#fbfdff}.item-head{display:flex;justify-content:space-between;gap:10px;align-items:center;padding:10px 12px;border-bottom:1px solid var(--line)}.item-head h4{margin:0}.item-body{padding:12px}.nested-card{margin-top:10px;padding:11px;border:1px solid #dce5ee;border-radius:11px;background:#fff}.nested-head{display:flex;justify-content:space-between;gap:8px;align-items:center;margin-bottom:9px}.nested-head strong{color:var(--navy)}.quiz-question{margin-top:10px;padding:11px;border-left:4px solid #89aed3;border-radius:0 10px 10px 0;background:#fff}.choices-grid{display:grid;grid-template-columns:1fr 1fr;gap:7px}.tabs{display:flex;gap:7px;overflow-x:auto;margin-bottom:12px}.tab{padding:8px 11px;border:1px solid var(--line);border-radius:9px;background:#fff;color:var(--navy);font-weight:800;white-space:nowrap}.tab.active{background:var(--navy);color:#fff;border-color:var(--navy)}.empty{padding:20px;border:1px dashed #b6c5d5;border-radius:12px;text-align:center;color:var(--muted)}.raw-json{font:12px/1.45 ui-monospace,SFMono-Regular,Consolas,monospace}.modal{position:fixed;z-index:50;inset:0;display:grid;place-items:center;padding:20px;background:rgba(8,31,57,.55)}.modal-card{width:min(760px,96vw);max-height:90vh;overflow:auto;padding:18px;border-radius:16px;background:#fff;box-shadow:var(--shadow)}
@media(max-width:900px){.admin-shell{grid-template-columns:1fr}.admin-sidebar{position:static;height:auto;border-right:0;border-bottom:1px solid var(--line)}.chapter-list{grid-template-columns:repeat(2,minmax(0,1fr))}.status-bar{top:0}.field-grid,.field-grid.three{grid-template-columns:1fr}.choices-grid{grid-template-columns:1fr}.admin-top{position:static;align-items:flex-start;flex-direction:column}}
@media(max-width:520px){.chapter-list{grid-template-columns:1fr}.admin-main{padding:10px}.admin-top nav{flex-wrap:wrap}}