/* HINH ANH Y HOC - V8.1.0 X-ray Atlas */
:root{--v81-viewer:#071015;--v81-viewer-2:#0b171d;--v81-viewer-line:rgba(190,224,231,.12);--v81-viewer-ink:#e7f2f4;--v81-viewer-muted:#8faab0;--v81-viewer-accent:#54d4c8}

/* Atlas library */
.v81-atlas-hero{position:relative;overflow:hidden;display:grid;grid-template-columns:minmax(0,1fr) 180px;gap:30px;align-items:end;padding:34px;border:1px solid color-mix(in srgb,var(--theme-accent) 18%,var(--line));border-radius:28px;background:linear-gradient(135deg,color-mix(in srgb,var(--surface) 93%,#e0f8f4),color-mix(in srgb,var(--surface) 95%,#eef3ff));box-shadow:0 18px 55px rgba(22,68,78,.08);margin-bottom:18px}
.v81-atlas-hero:after{content:"";position:absolute;right:-130px;top:-210px;width:390px;height:390px;border-radius:50%;background:radial-gradient(circle,color-mix(in srgb,var(--theme-accent) 22%,transparent),transparent 68%);pointer-events:none}.v81-atlas-hero>div,.v81-atlas-hero>aside{position:relative;z-index:1}
.v81-atlas-kicker,.v81-atlas-section header span,.v81-atlas-viewer-top>div>span,.v81-atlas-detail-head>span,.v81-atlas-source>span{font-size:10px;font-weight:900;letter-spacing:.13em;color:var(--theme-accent);text-transform:uppercase}
.v81-atlas-hero h1{font-size:clamp(34px,4.8vw,58px);line-height:1.03;margin:7px 0 12px;color:var(--ink);letter-spacing:normal}.v81-atlas-hero p{max-width:800px;color:var(--muted);font-size:12px;line-height:1.72}
.v81-atlas-hero>aside{min-height:148px;border-radius:22px;display:flex;flex-direction:column;justify-content:center;align-items:center;background:linear-gradient(145deg,#0a4650,#087a75);color:#fff;box-shadow:0 18px 42px rgba(6,78,83,.2)}.v81-atlas-hero>aside strong{font-size:46px;line-height:1}.v81-atlas-hero>aside span{font-size:11px;margin-top:5px}.v81-atlas-hero>aside small{font-size:9px;opacity:.72;margin-top:15px;letter-spacing:.08em}
.v81-atlas-search{display:grid;grid-template-columns:20px minmax(0,1fr) auto;gap:10px;align-items:center;max-width:820px;margin-top:22px;padding:8px 8px 8px 14px;border:1px solid var(--line);border-radius:17px;background:var(--surface);box-shadow:0 10px 28px rgba(24,56,66,.06)}.v81-atlas-search>.icon{width:17px;color:var(--muted)}.v81-atlas-search input{min-width:0;border:0;outline:0;background:transparent;color:var(--ink);font-size:12px}
.v81-atlas-regions{display:flex;gap:8px;flex-wrap:wrap;margin:0 0 28px}.v81-atlas-regions a{padding:8px 12px;border:1px solid var(--line);border-radius:999px;background:var(--surface);color:var(--muted);font-size:10px;font-weight:800;transition:.18s ease}.v81-atlas-regions a:hover,.v81-atlas-regions a.active{color:var(--theme-accent);border-color:color-mix(in srgb,var(--theme-accent) 40%,var(--line));background:color-mix(in srgb,var(--theme-soft) 72%,var(--surface));transform:translateY(-1px)}
.v81-atlas-section{display:grid;gap:15px;margin:0 0 30px}.v81-atlas-section>header{display:flex;align-items:end;justify-content:space-between;gap:20px}.v81-atlas-section h2{font-size:27px;margin:4px 0 0;color:var(--ink)}.v81-atlas-section header b{font-size:10px;color:var(--muted);font-weight:750}.v81-atlas-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}
.v81-atlas-card{position:relative;min-width:0;overflow:hidden;border:1px solid var(--line);border-radius:20px;background:var(--surface);color:var(--ink);box-shadow:0 12px 34px rgba(29,54,66,.055);transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease}.v81-atlas-card:hover{transform:translateY(-4px);box-shadow:0 22px 48px rgba(29,54,66,.11);border-color:color-mix(in srgb,var(--theme-accent) 30%,var(--line))}
.v81-atlas-card-image{height:220px;position:relative;display:grid;place-items:center;overflow:hidden;background:radial-gradient(circle at 50% 42%,#29404b 0,#14242c 47%,#081116 100%)}.v81-atlas-card-image img{width:100%;height:100%;object-fit:contain;display:block;transition:transform .22s ease}.v81-atlas-card:hover .v81-atlas-card-image img{transform:scale(1.025)}.v81-atlas-card-placeholder{display:grid;place-items:center;gap:7px;color:#a9bdc3;font-size:10px}.v81-atlas-card-placeholder .icon{width:46px;height:46px;opacity:.7}.v81-atlas-card-modality{position:absolute;left:12px;top:12px;padding:6px 9px;border-radius:999px;background:rgba(238,248,249,.9);color:#075961;font-size:8px;font-weight:900;letter-spacing:.06em;box-shadow:0 5px 18px rgba(0,0,0,.16)}
.v81-atlas-card-copy{padding:15px 42px 16px 16px}.v81-atlas-card-copy>span{font-size:9px;color:var(--theme-accent);font-weight:850}.v81-atlas-card-copy h3{font-size:15px;line-height:1.35;margin:5px 0 7px;color:var(--ink)}.v81-atlas-card-copy p{font-size:9px;color:var(--muted);line-height:1.5}.v81-atlas-card-arrow{position:absolute;right:14px;bottom:17px;width:28px;height:28px;display:grid;place-items:center;border-radius:9px;background:var(--theme-soft);color:var(--theme-accent)}.v81-atlas-card-arrow .icon{width:14px}

/* Viewer shell */
.v81-atlas-viewer-page{display:grid;gap:16px;max-width:1700px;margin:0 auto}.v81-atlas-viewer-top{display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:18px;align-items:center}.v81-atlas-back{display:flex;align-items:center;gap:7px;color:var(--muted);font-size:10px;font-weight:800}.v81-atlas-back .icon{width:14px;transform:rotate(180deg)}.v81-atlas-viewer-top h1{font-size:26px;line-height:1.2;margin:4px 0 0;color:var(--ink)}.v81-atlas-viewer-nav{display:flex;gap:6px}.v81-atlas-viewer-nav a{width:38px;height:38px;display:grid;place-items:center;border:1px solid var(--line);border-radius:11px;background:var(--surface);color:var(--ink);font-size:18px}.v81-atlas-viewer-nav a:hover{border-color:color-mix(in srgb,var(--theme-accent) 38%,var(--line));color:var(--theme-accent)}
.v81-atlas-viewer-layout{display:grid;grid-template-columns:minmax(0,1.65fr) minmax(320px,.72fr);gap:14px;align-items:stretch;min-height:720px;transition:grid-template-columns .22s ease}.v81-atlas-viewer-layout.detail-collapsed{grid-template-columns:minmax(0,1fr) 0}.v81-atlas-viewer-layout.detail-collapsed .v81-atlas-detail{display:none}
.v81-xray-viewer{min-width:0;overflow:hidden;display:grid;grid-template-rows:auto minmax(0,1fr) auto;border-radius:22px;background:var(--v81-viewer);color:var(--v81-viewer-ink);border:1px solid rgba(207,230,235,.12);box-shadow:0 22px 60px rgba(1,10,14,.22)}
.v81-xray-toolbar{position:relative;z-index:10;display:flex;align-items:center;justify-content:space-between;gap:14px;padding:11px 14px;border-bottom:1px solid var(--v81-viewer-line);background:rgba(8,18,23,.94);backdrop-filter:blur(12px);transition:opacity .2s ease,transform .2s ease}.v81-xray-toolbar-title>span{display:flex;align-items:center;gap:7px;font-size:9px;font-weight:900;letter-spacing:.12em}.v81-xray-toolbar-title i{width:7px;height:7px;border-radius:50%;background:var(--v81-viewer-accent);box-shadow:0 0 15px rgba(84,212,200,.7)}.v81-xray-toolbar-title small{display:block;margin-top:3px;color:var(--v81-viewer-muted);font-size:8px}
.v81-xray-toolbar-actions{display:flex;gap:6px}.v81-xray-toolbar button,.v81-xray-buttons button{appearance:none;border:1px solid rgba(210,234,238,.13);background:#101f26;color:var(--v81-viewer-ink);border-radius:10px;min-height:34px;padding:7px 10px;display:inline-flex;align-items:center;justify-content:center;gap:6px;font-size:9px;font-weight:750;cursor:pointer;transition:.15s ease}.v81-xray-toolbar button:hover,.v81-xray-buttons button:hover{border-color:rgba(84,212,200,.48);background:#152a31;color:#fff}.v81-xray-toolbar button .icon{width:14px;height:14px;color:var(--v81-viewer-accent)}
.v81-xray-stage{position:relative;min-height:620px;overflow:hidden;outline:0;background:radial-gradient(circle at 50% 45%,#15242b 0,#09141a 48%,#050b0f 100%);touch-action:none;user-select:none;cursor:crosshair}.v81-xray-stage:focus-visible{box-shadow:inset 0 0 0 2px rgba(84,212,200,.55);outline:0}.v81-xray-stage[data-mode="pan"]{cursor:grabbing}.v81-xray-stage[data-mode="zoom"]{cursor:ns-resize}.v81-xray-stage[data-mode="contrast"]{cursor:ew-resize}
.v81-xray-grid{position:absolute;inset:0;pointer-events:none;background-image:linear-gradient(rgba(255,255,255,.018) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.018) 1px,transparent 1px);background-size:42px 42px}.v81-xray-corner{position:absolute;top:12px;left:14px;z-index:4;color:rgba(211,229,234,.38);font-size:7px;font-weight:850;letter-spacing:.12em;pointer-events:none}
.v81-xray-image{position:absolute;left:50%;top:50%;transform-origin:center center;will-change:transform,filter;pointer-events:none}.v81-xray-image img{display:block;max-width:none;width:auto;height:auto;user-select:none;-webkit-user-drag:none;filter:none}.v81-xray-placeholder{width:760px;height:980px;display:grid;place-content:center;gap:10px;text-align:center;background:linear-gradient(160deg,#152a32,#071116);border:1px solid rgba(217,239,243,.12);color:#adc1c6}.v81-xray-placeholder .icon{width:70px;height:70px;margin:0 auto;color:#6fa59f;opacity:.8}.v81-xray-placeholder strong{font-size:18px}.v81-xray-placeholder span{font-size:11px;color:#789098}
.v81-xray-hud{position:absolute;z-index:8;min-width:112px;padding:9px 11px;border-radius:11px;background:rgba(2,9,12,.82);border:1px solid rgba(207,233,237,.16);backdrop-filter:blur(9px);box-shadow:0 10px 30px rgba(0,0,0,.28);pointer-events:none}.v81-xray-hud[hidden]{display:none}.v81-xray-hud span{display:block;color:var(--v81-viewer-muted);font-size:7px;font-weight:900;letter-spacing:.12em}.v81-xray-hud strong{display:block;margin-top:3px;font-size:18px;color:#fff}.v81-xray-shortcuts{position:absolute;z-index:5;left:50%;bottom:12px;transform:translateX(-50%);display:flex;gap:5px;flex-wrap:wrap;justify-content:center;pointer-events:none}.v81-xray-shortcuts span{padding:5px 7px;border-radius:7px;background:rgba(2,9,12,.58);border:1px solid rgba(217,238,242,.08);color:rgba(219,235,238,.55);font-size:7px;white-space:nowrap}
.v81-xray-controls{position:relative;z-index:10;display:grid;grid-template-columns:minmax(150px,1fr) minmax(150px,1fr) 72px auto;gap:12px;align-items:center;padding:11px 13px;border-top:1px solid var(--v81-viewer-line);background:rgba(8,18,23,.96);transition:opacity .2s ease,transform .2s ease}.v81-xray-slider{display:grid;gap:6px;min-width:0}.v81-xray-slider>span{display:flex;align-items:center;gap:5px;color:var(--v81-viewer-muted);font-size:8px}.v81-xray-slider>span .icon{width:12px}.v81-xray-slider b{margin-left:auto;color:var(--v81-viewer-ink);font-size:9px}.v81-xray-slider input{width:100%;accent-color:var(--v81-viewer-accent)}.v81-xray-readout{display:grid;place-items:center;padding:6px 8px;border-left:1px solid var(--v81-viewer-line);border-right:1px solid var(--v81-viewer-line)}.v81-xray-readout span{font-size:6.5px;letter-spacing:.12em;color:var(--v81-viewer-muted)}.v81-xray-readout b{font-size:11px;margin-top:3px;color:#fff}.v81-xray-buttons{display:flex;justify-content:flex-end;gap:5px;flex-wrap:wrap}
.v81-xray-viewer.is-inverted .v81-xray-toolbar-title i{background:#edf8f9;box-shadow:0 0 14px rgba(237,248,249,.6)}

/* Fullscreen workstation */
.v81-xray-viewer:fullscreen,.v81-xray-viewer.is-fullscreen{width:100vw;height:100vh;max-width:none;border:0;border-radius:0;grid-template-rows:auto minmax(0,1fr) auto;background:#020608}.v81-xray-viewer:fullscreen .v81-xray-stage,.v81-xray-viewer.is-fullscreen .v81-xray-stage{min-height:0}.v81-xray-viewer.controls-idle:fullscreen .v81-xray-toolbar,.v81-xray-viewer.controls-idle:fullscreen .v81-xray-controls{opacity:0}.v81-xray-viewer.controls-idle:fullscreen .v81-xray-toolbar{transform:translateY(-100%)}.v81-xray-viewer.controls-idle:fullscreen .v81-xray-controls{transform:translateY(100%)}.v81-xray-viewer:fullscreen .v81-xray-shortcuts{opacity:0}

/* Technical information */
.v81-atlas-detail{min-width:0;overflow:auto;max-height:calc(100vh - 150px);align-self:stretch;border:1px solid var(--line);border-radius:22px;background:var(--surface);box-shadow:0 15px 42px rgba(30,54,64,.055)}.v81-atlas-detail-head{padding:20px 20px 17px;border-bottom:1px solid var(--line);background:linear-gradient(135deg,color-mix(in srgb,var(--theme-soft) 65%,var(--surface)),var(--surface))}.v81-atlas-detail-head h2{font-size:22px;line-height:1.25;margin:5px 0;color:var(--ink)}.v81-atlas-detail-head small{font-size:9px;color:var(--muted)}
.v81-atlas-detail>section:not(.v81-atlas-source){display:grid;grid-template-columns:30px minmax(0,1fr);gap:11px;padding:17px 19px;border-bottom:1px solid var(--line)}.v81-atlas-detail>section:not(.v81-atlas-source)>span{width:26px;height:26px;display:grid;place-items:center;border-radius:8px;background:var(--theme-soft);color:var(--theme-accent);font-size:8px;font-weight:900}.v81-atlas-detail h3{font-size:12px;margin:2px 0 7px;color:var(--ink)}.v81-atlas-detail p,.v81-atlas-detail li{font-size:10px;line-height:1.66;color:var(--muted)}.v81-atlas-detail ul{padding-left:17px;display:grid;gap:6px}.v81-atlas-detail section.warning>span{background:color-mix(in srgb,#f5a53a 14%,var(--surface));color:#c87913}
.v81-atlas-source{padding:17px 19px}.v81-atlas-source>div{display:grid;gap:3px;margin:8px 0}.v81-atlas-source strong{font-size:10px;color:var(--ink)}.v81-atlas-source small{font-size:9px;color:var(--muted)}.v81-atlas-source .source-link{margin-top:8px;font-size:9px}
.v81-atlas-empty-copy{font-size:10px;color:var(--muted)}
.v81-viewer-help-list{display:grid;gap:7px;margin-top:16px}.v81-viewer-help-list>div{display:grid;grid-template-columns:minmax(145px,.8fr) minmax(0,1fr);gap:12px;align-items:center;padding:10px 11px;border-radius:11px;background:var(--theme-soft)}.v81-viewer-help-list b{font-size:10px;color:var(--ink)}.v81-viewer-help-list span{font-size:9px;color:var(--muted)}

/* Atlas admin */
.v81-atlas-admin{display:grid;grid-template-columns:minmax(0,1.42fr) minmax(285px,.58fr);gap:16px;align-items:start}.v81-atlas-admin-form{padding:22px}.v81-atlas-admin-form h2{font-size:27px}.v81-atlas-admin-form textarea{resize:vertical}.v81-atlas-admin-form .file-input{width:100%;padding:10px;border:1px dashed var(--line);border-radius:12px;background:var(--theme-soft);color:var(--ink);font-size:10px}.v81-atlas-admin-form .form-field>small{display:block;margin-top:6px;color:var(--muted);font-size:9px;line-height:1.55}
.v81-atlas-admin-preview{min-height:150px;margin-top:10px;border:1px dashed var(--line);border-radius:15px;background:linear-gradient(145deg,#12232b,#071116);display:grid;place-items:center;overflow:hidden;color:#91a9af}.v81-atlas-admin-preview img{width:100%;height:260px;object-fit:contain;background:#071015}.v81-atlas-admin-preview>span{font-size:10px}.v81-atlas-source-box{display:grid;gap:10px;margin-top:17px;padding:16px;border:1px solid color-mix(in srgb,var(--theme-accent) 18%,var(--line));border-radius:16px;background:color-mix(in srgb,var(--theme-soft) 48%,var(--surface))}.v81-atlas-source-box h3{font-size:14px;margin:3px 0 4px}.v81-atlas-source-box>div:first-child p:last-child{font-size:9px;color:var(--muted);line-height:1.55}.v81-atlas-admin-guide{position:sticky;top:82px;padding:20px}.v81-atlas-admin-guide h3{font-size:17px;margin:4px 0 12px}.v81-atlas-admin-guide ol{padding-left:19px;display:grid;gap:8px}.v81-atlas-admin-guide li{font-size:10px;color:var(--muted);line-height:1.55}
.v81-atlas-admin-list{display:grid;gap:8px;margin-bottom:30px}.v81-atlas-admin-row{display:grid;grid-template-columns:82px minmax(0,1fr) auto;gap:13px;align-items:center;padding:10px;border:1px solid var(--line);border-radius:15px;background:var(--surface)}.v81-atlas-admin-thumb{width:82px;height:74px;display:grid;place-items:center;overflow:hidden;border-radius:10px;background:#081218;color:#7ea19f}.v81-atlas-admin-thumb img{width:100%;height:100%;object-fit:contain}.v81-atlas-admin-thumb .icon{width:28px}.v81-atlas-admin-row h3{font-size:12px;margin:6px 0 3px}.v81-atlas-admin-row p{font-size:9px;color:var(--muted)}.v81-atlas-admin-actions{display:flex;gap:5px;align-items:center}.v81-source-ok{color:#14956f;font-weight:800}.v81-source-warn{color:#c77913;font-weight:800}

@media(max-width:1250px){.v81-atlas-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.v81-atlas-viewer-layout{grid-template-columns:minmax(0,1.45fr) minmax(300px,.72fr)}.v81-xray-controls{grid-template-columns:1fr 1fr 68px}.v81-xray-buttons{grid-column:1/-1;justify-content:flex-start}.v81-atlas-admin{grid-template-columns:1fr}.v81-atlas-admin-guide{position:static}}
@media(max-width:980px){.v81-atlas-viewer-layout,.v81-atlas-viewer-layout.detail-collapsed{grid-template-columns:1fr;min-height:0}.v81-atlas-viewer-layout.detail-collapsed .v81-atlas-detail{display:none}.v81-atlas-detail{max-height:none}.v81-xray-stage{min-height:65vh}.v81-atlas-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:720px){.v81-atlas-hero{grid-template-columns:1fr;padding:22px;border-radius:21px}.v81-atlas-hero>aside{display:none}.v81-atlas-search{grid-template-columns:18px minmax(0,1fr)}.v81-atlas-search .btn{grid-column:1/-1;width:100%}.v81-atlas-grid{grid-template-columns:1fr}.v81-atlas-card-image{height:250px}.v81-atlas-viewer-top{grid-template-columns:1fr auto}.v81-atlas-back{grid-column:1/-1}.v81-atlas-viewer-top h1{font-size:22px}.v81-xray-viewer{border-radius:16px}.v81-xray-stage{min-height:58vh}.v81-xray-toolbar-actions button span,.v81-xray-buttons button span{display:none}.v81-xray-shortcuts{display:none}.v81-xray-controls{grid-template-columns:1fr 1fr}.v81-xray-readout{border:0;justify-self:start;place-items:start}.v81-xray-buttons{grid-column:auto;justify-self:end}.v81-atlas-admin-row{grid-template-columns:64px minmax(0,1fr)}.v81-atlas-admin-thumb{width:64px;height:64px}.v81-atlas-admin-actions{grid-column:1/-1;justify-content:flex-end}.v81-viewer-help-list>div{grid-template-columns:1fr;gap:2px}}
@media(max-width:520px){.v81-atlas-card-image{height:220px}.v81-atlas-section>header{align-items:start}.v81-xray-stage{min-height:54vh}.v81-xray-controls{grid-template-columns:1fr;padding:10px}.v81-xray-readout{display:none}.v81-xray-buttons{grid-column:1;justify-self:stretch;justify-content:space-between}.v81-xray-buttons button{flex:1;min-width:42px}.v81-xray-toolbar-title small{display:none}.v81-atlas-detail>section:not(.v81-atlas-source){padding:15px}.v81-atlas-admin-form{padding:16px}.v81-atlas-admin-row{grid-template-columns:1fr}.v81-atlas-admin-thumb{width:100%;height:140px}.v81-atlas-admin-actions{grid-column:1}}
@media(prefers-reduced-motion:reduce){.v81-atlas-card,.v81-atlas-card-image img,.v81-atlas-regions a,.v81-xray-toolbar,.v81-xray-controls{transition:none!important}.v81-atlas-card:hover,.v81-atlas-regions a:hover{transform:none!important}}