:root{--navy:#0b1930;--navy2:#111f38;--purple:#7c3aed;--bg:#f4f7fb;--line:#e4e9f1;--text:#13213a;--muted:#6d7890;--white:#fff;--green:#10a95c;--blue:#1976f3;--orange:#f59e0b;--red:#ef3340}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,system-ui,-apple-system,"Segoe UI",sans-serif}.admin-shell{min-height:100vh;display:grid;grid-template-columns:250px minmax(0,1fr)}.admin-sidebar{position:sticky;top:0;height:100vh;background:linear-gradient(180deg,var(--navy),#0d1c34);color:#fff;padding:20px 14px;display:flex;flex-direction:column}.sidebar-brand{display:flex;gap:11px;align-items:center;padding:4px 8px 24px}.sidebar-logo{width:42px;height:42px;border-radius:11px;background:linear-gradient(145deg,#8b5cf6,#6d28d9);display:grid;place-items:center}.sidebar-brand strong{display:block;font-size:14px}.sidebar-brand small{display:block;color:#aeb9c9;margin-top:3px}.sidebar-nav{display:grid;gap:6px}.sidebar-nav a,.sidebar-footer a{display:flex;align-items:center;gap:11px;padding:12px;border-radius:9px;color:#cbd5e1;text-decoration:none;font-weight:700}.sidebar-nav a:hover,.sidebar-nav a.active,.sidebar-footer a:hover{background:rgba(124,58,237,.2);color:#fff}.sidebar-nav svg,.sidebar-footer svg{width:19px}.sidebar-footer{margin-top:auto}.admin-main{min-width:0;padding:24px}.admin-top{display:flex;justify-content:space-between;align-items:center;gap:16px;margin-bottom:22px}.admin-top h1{margin:0;font-size:26px}.admin-top p{margin:5px 0 0;color:var(--muted)}.profile-chip{display:flex;align-items:center;gap:10px;background:#fff;border:1px solid var(--line);border-radius:10px;padding:8px 12px}.profile-avatar{width:36px;height:36px;border-radius:50%;display:grid;place-items:center;background:#efe9ff;color:var(--purple);font-weight:900}.metrics{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:14px}.metric{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px;box-shadow:0 10px 28px rgba(15,28,52,.06)}.metric-head{display:flex;justify-content:space-between;align-items:center;color:var(--muted);font-size:13px;font-weight:700}.metric-icon{width:39px;height:39px;border-radius:10px;display:grid;place-items:center}.metric strong{display:block;font-size:30px;margin-top:12px}.purple{background:#efe9ff;color:var(--purple)}.blue{background:#e9f2ff;color:var(--blue)}.green{background:#e8f9f0;color:var(--green)}.orange{background:#fff3dc;color:var(--orange)}.red{background:#ffecef;color:var(--red)}.content-grid{display:grid;grid-template-columns:1.3fr .7fr;gap:16px;margin-top:18px}.admin-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px;box-shadow:0 10px 28px rgba(15,28,52,.05)}.card-title{display:flex;justify-content:space-between;align-items:center;margin-bottom:14px}.card-title h2{margin:0;font-size:17px}.course-row{display:flex;align-items:center;justify-content:space-between;padding:13px 0;border-bottom:1px solid #edf0f4}.course-row:last-child{border-bottom:0}.course-row small{display:block;color:var(--muted);margin-top:4px}.btn{border:0;border-radius:8px;padding:10px 14px;text-decoration:none;display:inline-flex;align-items:center;gap:8px;font-weight:800;cursor:pointer}.btn-primary{background:var(--purple);color:#fff}.btn-light{background:#f1f4f8;color:var(--text)}.btn-danger{background:var(--red);color:#fff}.form-card{max-width:850px}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}.field-group label{display:block;font-weight:800;margin-bottom:7px}.field{width:100%;height:43px;border:1px solid #dfe5ed;border-radius:8px;padding:0 12px;outline:0}.field:focus{border-color:#8a63f6;box-shadow:0 0 0 3px rgba(124,58,237,.1)}.help{font-size:12px;color:var(--muted);margin-top:6px}.notice{padding:12px 14px;border-radius:9px;margin-bottom:16px}.notice.ok{background:#e8f9f0;color:#087a41}.notice.error{background:#ffecef;color:#b4232f}.map-page .admin-main{padding:0}.map-page .workspace{min-height:calc(100vh - 76px)}.map-adminbar{height:66px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 18px;gap:16px}.map-adminbar .left,.map-adminbar .right{display:flex;align-items:center;gap:10px}.course-select{height:40px;border:1px solid var(--line);border-radius:8px;padding:0 10px;background:#fff;min-width:230px}.presentation-layout{display:grid;grid-template-columns:360px minmax(0,1fr);min-height:calc(100vh - 110px);background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden}.presentation-tree{padding:18px;border-right:1px solid var(--line);overflow:auto}.presentation-content{padding:28px;overflow:auto}.presentation-content h1{margin-top:0}.presentation-content .subtitle{color:var(--muted);font-size:17px}.lesson-body{white-space:pre-wrap;line-height:1.8;margin-top:24px}.student-tree button{width:100%;text-align:left;border:0;background:transparent;padding:9px 10px;border-radius:7px;color:var(--text);cursor:pointer}.student-tree button:hover,.student-tree button.active{background:#f0eaff;color:var(--purple)}.student-children{margin-left:18px;border-left:1px solid #ddd5fa;padding-left:8px}.presentation-controls{display:flex;justify-content:space-between;margin-top:30px}.login-page{min-height:100vh;display:grid;place-items:center;background:linear-gradient(135deg,#09162b,#132541)}.login-card{width:min(430px,calc(100% - 30px));background:#fff;border-radius:18px;padding:30px;box-shadow:0 30px 70px rgba(0,0,0,.28)}.login-icon{width:58px;height:58px;border-radius:14px;background:linear-gradient(145deg,#8b5cf6,#6d28d9);color:#fff;display:grid;place-items:center;margin-bottom:18px}.login-card h1{margin:0}.login-card p{color:var(--muted)}@media(max-width:1100px){.metrics{grid-template-columns:repeat(3,1fr)}.content-grid{grid-template-columns:1fr}}@media(max-width:800px){.admin-shell{grid-template-columns:1fr}.admin-sidebar{height:auto;position:relative}.sidebar-nav{grid-template-columns:repeat(2,1fr)}.sidebar-footer{margin-top:12px}.metrics{grid-template-columns:repeat(2,1fr)}.presentation-layout{grid-template-columns:1fr}.presentation-tree{border-right:0;border-bottom:1px solid var(--line)}.form-grid{grid-template-columns:1fr}}@media(max-width:520px){.admin-main{padding:14px}.metrics{grid-template-columns:1fr}.sidebar-nav{grid-template-columns:1fr}.admin-top{align-items:flex-start;flex-direction:column}}