:root{
  --hgdvl-primary:#0b4f8a;
  --hgdvl-primary-2:#0f6fb7;
  --hgdvl-accent:#f0a202;
  --hgdvl-text:#1f2937;
  --hgdvl-muted:#64748b;
  --hgdvl-border:#dbe3ec;
  --hgdvl-bg:#f6f9fc;
  --hgdvl-radius:14px;
  --hgdvl-shadow:0 10px 28px rgba(15,79,138,.10);
}
.hgdvl-form,.hgdvl-filter,.hgdvl-profile-details,.hgdvl-resource-meta,.hgdvl-event-details,.hgdvl-event-registration{box-sizing:border-box}
.hgdvl-form{background:#fff;border:1px solid var(--hgdvl-border);border-radius:var(--hgdvl-radius);padding:clamp(18px,3vw,34px);box-shadow:var(--hgdvl-shadow)}
.hgdvl-form label,.hgdvl-filter label{display:block;font-weight:600;color:var(--hgdvl-text)}
.hgdvl-form input[type=text],.hgdvl-form input[type=email],.hgdvl-form input[type=date],.hgdvl-form input[type=tel],.hgdvl-form input[type=url],.hgdvl-form input[type=number],.hgdvl-form select,.hgdvl-form textarea,.hgdvl-filter input,.hgdvl-filter select{width:100%;box-sizing:border-box;border:1px solid #b8c6d5;border-radius:8px;padding:11px 12px;font:inherit;background:#fff;color:var(--hgdvl-text)}
.hgdvl-form input:focus,.hgdvl-form select:focus,.hgdvl-form textarea:focus,.hgdvl-filter input:focus,.hgdvl-filter select:focus{outline:3px solid rgba(15,111,183,.20);border-color:var(--hgdvl-primary-2)}
.hgdvl-form small,.hgdvl-form .description{display:block;color:var(--hgdvl-muted);font-weight:400;margin-top:5px}
.hgdvl-form fieldset{border:1px solid var(--hgdvl-border);border-radius:10px;padding:14px 16px;margin:20px 0}
.hgdvl-form legend{font-weight:700;color:var(--hgdvl-primary)}
.hgdvl-check{font-weight:400!important;display:block!important;margin:8px 0}
.hgdvl-check input{width:auto!important;margin-right:7px}
.hgdvl-grid{display:grid;gap:14px 20px}
.hgdvl-grid p{margin:0 0 8px}
.hgdvl-grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.hgdvl-grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.hgdvl-button{display:inline-flex;align-items:center;justify-content:center;gap:7px;border:0;border-radius:9px;padding:11px 18px;background:var(--hgdvl-primary);color:#fff!important;font-weight:700;text-decoration:none!important;cursor:pointer;line-height:1.2}
.hgdvl-button:hover,.hgdvl-button:focus{background:var(--hgdvl-primary-2);color:#fff!important}
.hgdvl-button:focus{outline:3px solid rgba(15,111,183,.25);outline-offset:2px}
.hgdvl-button--secondary{background:#e8f0f7;color:var(--hgdvl-primary)!important}
.hgdvl-button--small{padding:8px 12px;font-size:.92rem}
.hgdvl-form-intro{padding:12px 15px;background:var(--hgdvl-bg);border-left:4px solid var(--hgdvl-primary);border-radius:6px}
.hgdvl-notice{margin:16px 0;padding:13px 16px;border-radius:9px;border:1px solid}
.hgdvl-notice--success{background:#ecfdf3;border-color:#86efac;color:#166534}
.hgdvl-notice--error{background:#fff1f2;border-color:#fda4af;color:#9f1239}
.hgdvl-notice--info{background:#eff6ff;border-color:#93c5fd;color:#1e40af}
.hgdvl-honeypot{position:absolute!important;left:-9999px!important;width:1px!important;height:1px!important;overflow:hidden!important}
.hgdvl-filter{display:grid;grid-template-columns:repeat(5,minmax(130px,1fr));align-items:end;gap:12px;background:var(--hgdvl-bg);border:1px solid var(--hgdvl-border);padding:16px;border-radius:12px;margin:0 0 22px}
.hgdvl-filter label span{display:block;font-size:.9rem;margin-bottom:5px;color:var(--hgdvl-muted)}
.hgdvl-card-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px}
.hgdvl-card{background:#fff;border:1px solid var(--hgdvl-border);border-radius:var(--hgdvl-radius);overflow:hidden;box-shadow:0 5px 18px rgba(15,23,42,.06)}
.hgdvl-card-image{display:block;aspect-ratio:16/9;overflow:hidden;background:linear-gradient(135deg,#e8f0f7,#d5e7f5)}
.hgdvl-card-image img{width:100%;height:100%;object-fit:cover;display:block;transition:transform .3s ease}
.hgdvl-card:hover .hgdvl-card-image img{transform:scale(1.025)}
.hgdvl-placeholder{display:flex;align-items:center;justify-content:center;width:100%;height:100%;font-size:4rem;color:var(--hgdvl-primary);font-family:Georgia,serif}
.hgdvl-card-body{padding:18px}
.hgdvl-card-title{font-size:1.18rem;line-height:1.35;margin:8px 0 10px}
.hgdvl-card-title a{color:var(--hgdvl-text);text-decoration:none}
.hgdvl-card-title a:hover{color:var(--hgdvl-primary)}
.hgdvl-card-taxonomies span{display:inline-block;background:#eaf3fb;color:var(--hgdvl-primary);padding:4px 8px;border-radius:999px;font-size:.78rem;margin:0 4px 4px 0}
.hgdvl-card-meta,.hgdvl-event-date,.hgdvl-result-count{color:var(--hgdvl-muted);font-size:.9rem}
.hgdvl-event-date{font-weight:700;color:var(--hgdvl-primary)}
.hgdvl-profile-details,.hgdvl-resource-meta,.hgdvl-event-details,.hgdvl-event-registration{margin:28px 0;padding:22px;border:1px solid var(--hgdvl-border);border-radius:var(--hgdvl-radius);background:#fff}
.hgdvl-profile-details dl,.hgdvl-resource-meta dl,.hgdvl-event-details dl{display:grid;grid-template-columns:minmax(140px,220px) 1fr;gap:8px 18px;margin:0}
.hgdvl-profile-details dt,.hgdvl-resource-meta dt,.hgdvl-event-details dt{font-weight:700;color:var(--hgdvl-primary)}
.hgdvl-profile-details dd,.hgdvl-resource-meta dd,.hgdvl-event-details dd{margin:0}
.hgdvl-verified{display:inline-block;background:#ecfdf3;color:#166534;padding:7px 11px;border-radius:999px;font-weight:700}
.hgdvl-responsive-table{width:100%;border-collapse:collapse;background:#fff}
.hgdvl-responsive-table th,.hgdvl-responsive-table td{border:1px solid var(--hgdvl-border);padding:11px 12px;text-align:left;vertical-align:top}
.hgdvl-responsive-table thead{background:var(--hgdvl-primary);color:#fff}
.hgdvl-responsive-table tbody tr:nth-child(even){background:#f8fafc}
.hgdvl-empty{grid-column:1/-1;text-align:center;padding:35px;border:1px dashed #a9b9c8;border-radius:12px;background:#fafcff}
.hgdvl-editor-preview{border:1px dashed #8fa9bf;border-radius:10px;background:#fff;padding:18px;margin:12px 0 20px;min-height:90px}
.hgdvl-editor-preview[hidden]{display:none}
.hgdvl-preview-toolbar{display:flex;gap:10px;align-items:center;margin:10px 0}
.hgdvl-citation{background:#f8fafc;padding:12px;border-left:4px solid var(--hgdvl-primary)}
.hgdvl-suite-active mjx-container[display="true"]{overflow-x:auto;overflow-y:hidden;padding:6px 0}
.hgdvl-suite-active mark{background:#fff3a3;padding:0 .1em}
.pagination .page-numbers,.page-numbers{list-style:none}
ul.page-numbers{display:flex;gap:6px;flex-wrap:wrap;padding:0;margin:24px 0}
ul.page-numbers a,ul.page-numbers span{display:inline-flex;min-width:38px;height:38px;align-items:center;justify-content:center;border:1px solid var(--hgdvl-border);border-radius:8px;text-decoration:none}
ul.page-numbers .current{background:var(--hgdvl-primary);color:#fff;border-color:var(--hgdvl-primary)}
@media (max-width:1000px){.hgdvl-filter{grid-template-columns:repeat(3,minmax(0,1fr))}.hgdvl-card-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:720px){
  .hgdvl-grid--2,.hgdvl-grid--3,.hgdvl-filter,.hgdvl-card-grid{grid-template-columns:1fr}
  .hgdvl-form{padding:18px}
  .hgdvl-profile-details dl,.hgdvl-resource-meta dl,.hgdvl-event-details dl{grid-template-columns:1fr;gap:2px}
  .hgdvl-profile-details dd,.hgdvl-resource-meta dd,.hgdvl-event-details dd{margin:0 0 10px}
  .hgdvl-responsive-table,.hgdvl-responsive-table thead,.hgdvl-responsive-table tbody,.hgdvl-responsive-table th,.hgdvl-responsive-table td,.hgdvl-responsive-table tr{display:block}
  .hgdvl-responsive-table thead{position:absolute;left:-9999px}
  .hgdvl-responsive-table tr{border:1px solid var(--hgdvl-border);border-radius:10px;margin-bottom:12px;padding:10px;background:#fff!important}
  .hgdvl-responsive-table td{border:0;border-bottom:1px solid #edf2f7;padding:8px 4px;display:grid;grid-template-columns:120px 1fr;gap:10px}
  .hgdvl-responsive-table td:last-child{border-bottom:0}
  .hgdvl-responsive-table td:before{content:attr(data-label);font-weight:700;color:var(--hgdvl-primary)}
}

/* Physics equation workbench */
.hgdvl-equation-tool{
  margin:18px 0 24px;
  border:1px solid #c8d7e6;
  border-radius:16px;
  background:linear-gradient(180deg,#f8fbfe 0%,#f2f7fb 100%);
  box-shadow:0 10px 28px rgba(15,79,138,.08);
  overflow:hidden;
}
.hgdvl-equation-header{display:flex;align-items:flex-start;justify-content:space-between;gap:18px;padding:20px 22px;border-bottom:1px solid #d9e4ee;background:#fff}
.hgdvl-equation-header h3{margin:0 0 5px;color:var(--hgdvl-primary);font-size:1.25rem}
.hgdvl-equation-header .description{margin:0;max-width:760px}
.hgdvl-equation-kicker{margin:0 0 3px;text-transform:uppercase;letter-spacing:.12em;font-size:.72rem;font-weight:800;color:var(--hgdvl-primary-2)}
.hgdvl-equation-workspace{display:grid;grid-template-columns:minmax(310px,.9fr) minmax(360px,1.1fr);min-height:590px}
.hgdvl-equation-library{border-right:1px solid #d9e4ee;padding:18px;background:#f8fbfe;min-width:0}
.hgdvl-equation-composer{padding:20px;background:#fff;min-width:0}
.hgdvl-equation-search-label{display:block;font-weight:700;margin-bottom:6px;color:var(--hgdvl-text)}
.hgdvl-equation-search{width:100%;border:1px solid #b8c6d5;border-radius:10px;padding:10px 12px;background:#fff;color:var(--hgdvl-text)}
.hgdvl-equation-search:focus{outline:3px solid rgba(15,111,183,.18);border-color:var(--hgdvl-primary-2)}
.hgdvl-equation-tabs{display:flex;gap:7px;overflow-x:auto;padding:12px 0 10px;scrollbar-width:thin}
.hgdvl-equation-tabs button{flex:0 0 auto;border:1px solid #c3d2df;border-radius:999px;background:#fff;color:#37556f;padding:7px 11px;font-size:.82rem;font-weight:700;cursor:pointer}
.hgdvl-equation-tabs button:hover,.hgdvl-equation-tabs button:focus,.hgdvl-equation-tabs button.is-active{background:var(--hgdvl-primary);border-color:var(--hgdvl-primary);color:#fff;outline:0}
.hgdvl-equation-template-list{display:grid;gap:8px;max-height:480px;overflow:auto;padding-right:5px;scrollbar-width:thin}
.hgdvl-equation-template[hidden],.hgdvl-equation-category-group[hidden],.hgdvl-equation-empty[hidden]{display:none!important}
.hgdvl-equation-filter-status{display:flex;align-items:center;justify-content:space-between;gap:10px;margin:0 0 10px;padding:8px 10px;border:1px solid #d7e3ed;border-radius:9px;background:#fff;color:#526b80;font-size:.8rem}
.hgdvl-equation-filter-status strong{display:grid;place-items:center;min-width:28px;height:24px;padding:0 7px;border-radius:999px;background:var(--hgdvl-primary);color:#fff;font-size:.76rem}
.hgdvl-equation-category-group{display:grid;gap:7px}
.hgdvl-equation-category-group+h4{margin-top:8px}
.hgdvl-equation-category-group h4{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:4px 0 0;color:#294b68;font-size:.83rem;letter-spacing:.01em}
.hgdvl-equation-category-group h4 small{color:#71879a;font-size:.72rem;font-weight:650}
.hgdvl-equation-category-items{display:grid;gap:8px}

.hgdvl-equation-template{display:grid;gap:3px;width:100%;text-align:left;border:1px solid #d3dfe9;border-radius:10px;background:#fff;padding:10px 11px;cursor:pointer;transition:border-color .15s ease,box-shadow .15s ease,transform .15s ease}
.hgdvl-equation-template span{font-weight:750;color:#1f3347;line-height:1.28}
.hgdvl-equation-template code{font-family:Consolas,"Courier New",monospace;font-size:.77rem;color:#5b7085;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;background:transparent;padding:0}
.hgdvl-equation-template:hover,.hgdvl-equation-template:focus,.hgdvl-equation-template.is-selected{border-color:var(--hgdvl-primary-2);box-shadow:0 5px 14px rgba(15,111,183,.12);transform:translateY(-1px);outline:0}
.hgdvl-equation-template.is-selected{background:#eef7fd}
.hgdvl-equation-empty{padding:20px 10px;text-align:center;color:var(--hgdvl-muted)}
.hgdvl-equation-composer>label{display:block;font-weight:800;margin-bottom:6px;color:var(--hgdvl-text)}
.hgdvl-equation-composer textarea{width:100%;box-sizing:border-box;border:1px solid #aebfce;border-radius:11px;padding:12px 14px;font-family:Consolas,"Courier New",monospace;font-size:.96rem;line-height:1.55;background:#fbfdff;color:#16283a;resize:vertical;min-height:112px}
.hgdvl-equation-composer textarea:focus{outline:3px solid rgba(15,111,183,.18);border-color:var(--hgdvl-primary-2);background:#fff}
.hgdvl-equation-palette{border:1px solid #d9e4ee;border-radius:10px;margin:12px 0;background:#fafcfe}
.hgdvl-equation-palette summary{cursor:pointer;font-weight:800;color:var(--hgdvl-primary);padding:10px 12px;user-select:none}
.hgdvl-equation-structures,.hgdvl-equation-symbols{display:flex;flex-wrap:wrap;gap:7px;padding:0 11px 12px}
.hgdvl-equation-structures button,.hgdvl-equation-symbols button{border:1px solid #c6d5e2;border-radius:8px;background:#fff;color:#294b68;padding:7px 9px;cursor:pointer;font-weight:650;line-height:1.2}
.hgdvl-equation-symbols button{min-width:45px;font-family:Consolas,"Courier New",monospace}
.hgdvl-equation-structures button:hover,.hgdvl-equation-structures button:focus,.hgdvl-equation-symbols button:hover,.hgdvl-equation-symbols button:focus{border-color:var(--hgdvl-primary);background:#eaf4fb;color:var(--hgdvl-primary);outline:2px solid rgba(15,111,183,.12)}
.hgdvl-equation-preview-wrap{margin-top:14px;border:1px solid #c7d7e4;border-radius:12px;overflow:hidden;background:#fff}
.hgdvl-equation-preview-heading{display:flex;justify-content:space-between;gap:12px;align-items:center;padding:9px 12px;background:#f2f7fb;border-bottom:1px solid #d9e4ee;color:#294b68;font-size:.88rem}
.hgdvl-equation-preview-heading span{color:#166534;font-weight:650;text-align:right}
.hgdvl-equation-preview{display:flex;align-items:center;justify-content:center;min-height:112px;padding:17px;overflow-x:auto;overflow-y:hidden;text-align:center;background:#fff}
.hgdvl-equation-preview-placeholder{color:#7b8fa2;font-size:.92rem}
.hgdvl-equation-actions{display:flex;flex-wrap:wrap;gap:9px;margin-top:14px}
.hgdvl-equation-actions .hgdvl-button:first-child{flex:1 1 190px}
.hgdvl-equation-guide{border-top:1px solid #d9e4ee;background:#fff;padding:0 22px}
.hgdvl-equation-guide summary{cursor:pointer;font-weight:800;color:var(--hgdvl-primary);padding:14px 0}
.hgdvl-equation-guide-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px 18px;padding:0 0 18px}
.hgdvl-equation-guide-grid p{margin:0;color:#485d72;font-size:.88rem}
.hgdvl-equation-guide code{font-family:Consolas,"Courier New",monospace;background:#f2f7fb;padding:2px 5px;border-radius:4px;color:#294b68}
.hgdvl-editor-preview{border:1px dashed #8fa9bf;border-radius:12px;background:#fff;padding:20px;margin:12px 0 20px;min-height:90px}
.hgdvl-editor-preview[hidden]{display:none}
.hgdvl-preview-toolbar{display:flex;gap:10px;align-items:center;margin:12px 0}

/* Stable MathJax wrappers inserted by [hgdvl_math]. */
.hgdvl-math--inline{display:inline}
.hgdvl-math--display{display:block;max-width:100%;overflow-x:auto;overflow-y:hidden;margin:.75em 0;padding:.2em 0;text-align:center}
.hgdvl-math mjx-container{max-width:100%}
.hgdvl-math mjx-container[jax="SVG"]{max-width:100%;overflow-x:auto;overflow-y:hidden}
.hgdvl-math--inline mjx-container[jax="SVG"]{display:inline-block!important;margin:0 .08em}
.hgdvl-math--display mjx-container[jax="SVG"]{display:block!important;margin:.35em auto!important;text-align:center}
.hgdvl-math mjx-container[jax="SVG"]>svg{max-width:none}
.hgdvl-suite-active mjx-container[jax="SVG"][display="true"]{max-width:100%;overflow-x:auto;overflow-y:hidden;padding:.25em 0}

@media (max-width:900px){
  .hgdvl-equation-workspace{grid-template-columns:1fr}
  .hgdvl-equation-library{border-right:0;border-bottom:1px solid #d9e4ee}
  .hgdvl-equation-template-list{max-height:320px}
  .hgdvl-equation-guide-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:620px){
  .hgdvl-equation-header{display:block;padding:17px}
  .hgdvl-equation-clear{margin-top:10px;width:100%}
  .hgdvl-equation-library,.hgdvl-equation-composer{padding:14px}
  .hgdvl-equation-guide{padding:0 15px}
  .hgdvl-equation-guide-grid{grid-template-columns:1fr}
  .hgdvl-equation-actions .hgdvl-button{width:100%;flex:1 1 100%}
  .hgdvl-equation-template-list{max-height:360px}
}