/* ==========================================================================
   Risk Management and Derivatives — shared course stylesheet
   Design tokens ported verbatim from the existing sjtu course pages.
   Palette: warm paper + single blue accent. Bricolage / Hanken / JetBrains.
   ========================================================================== */
:root{
  --paper:#f6f5f1;--paper-2:#edebe3;--paper-3:#e6e3da;
  --ink:#1a1a17;--ink-soft:#4e4a43;--ink-faint:#8b867b;
  --accent:#15507e;--accent-strong:#0e3754;--accent-soft:#e6eef5;--accent-hair:rgba(21,80,126,.4);
  --line:rgba(26,26,23,.12);--line-strong:rgba(26,26,23,.2);
  --good:#2e7d54;--good-soft:#e4f0e9;
  --warn:#9a6a18;--warn-soft:#f5ecdb;
  --serif:'Bricolage Grotesque','Hanken Grotesk',system-ui,-apple-system,sans-serif;
  --sans:'Hanken Grotesk',system-ui,-apple-system,'Segoe UI',sans-serif;
  --mono:'JetBrains Mono',ui-monospace,'SFMono-Regular',Menlo,Monaco,monospace;
}
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--sans);color:var(--ink);min-height:100vh;background-color:var(--paper);background:radial-gradient(circle 840px at 50% -16%, #ffffff 0%, transparent 52%),linear-gradient(180deg,#faf9f6 0%,var(--paper) 100%);-webkit-font-smoothing:antialiased;line-height:1.55;overflow-x:hidden}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}

/* ---- shell ---- */
.page{width:100%;min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:flex-start;padding:1.6rem 1rem 1.6rem;gap:1.1rem}
.card{position:relative;width:min(100%,1020px);min-width:0;background:#fff;border:1px solid var(--line-strong);border-radius:5px;box-shadow:0 1px 2px rgba(26,26,23,.05),0 30px 64px rgba(26,26,23,.1);overflow:hidden}
.card::before{content:"";display:block;height:3px;background:var(--accent)}
.pg{max-width:none;margin:0;padding:2.2rem 2rem 1.9rem}
@media (max-width:760px){.pg{padding:1.35rem .95rem 1.25rem}}

/* ---- top navigation bar ---- */
.sitenav{position:sticky;top:.6rem;z-index:40;background:rgba(255,255,255,.92);backdrop-filter:saturate(140%) blur(10px);border:1px solid var(--line-strong);box-shadow:0 1px 2px rgba(26,26,23,.05),0 12px 30px rgba(26,26,23,.07);width:min(100%,1020px);border-radius:6px}
.sitenav .nav-in{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:.7rem 1.2rem}
.sitenav .brand{display:flex;flex-direction:column;line-height:1.05}
.sitenav .brand .code{font-family:var(--mono);font-size:.66rem;letter-spacing:.2em;text-transform:uppercase;color:var(--accent)}
.sitenav .brand .name{font-family:var(--serif);font-weight:600;font-size:1.02rem;color:var(--ink);letter-spacing:-.01em}
.sitenav ul{list-style:none;display:flex;gap:.2rem;align-items:center}
.sitenav ul a{font-family:var(--mono);font-size:.7rem;letter-spacing:.13em;text-transform:uppercase;color:var(--ink-soft);padding:.5rem .7rem;border-radius:4px;transition:background-color .15s,color .15s;white-space:nowrap}
.sitenav ul a:hover{color:var(--accent);background:var(--accent-soft)}
.sitenav ul a.active{color:var(--accent-strong);background:var(--accent-soft);font-weight:500}
@media (max-width:720px){
  .sitenav .nav-in{flex-direction:column;align-items:stretch;gap:.55rem;padding:.6rem .8rem}
  .sitenav ul{overflow-x:auto;-webkit-overflow-scrolling:touch;gap:.15rem;padding-bottom:.1rem}
  .sitenav ul::-webkit-scrollbar{height:0}
}

/* ---- headings / type ---- */
.kicker{font-family:var(--mono);font-size:.72rem;letter-spacing:.22em;text-transform:uppercase;color:var(--ink-faint);display:flex;align-items:center;gap:.7rem;margin-bottom:1.1rem}
.kicker::before{content:"";width:28px;height:1px;background:var(--accent)}
h1.page-title{font-family:var(--serif);font-weight:700;font-size:clamp(2rem,4.2vw,3.15rem);line-height:1.04;letter-spacing:-.035em;color:var(--ink);font-variation-settings:'opsz' 72;hyphens:none;overflow-wrap:normal;word-break:normal;text-wrap:balance}
h1.page-title::before{content:"";display:block;width:34px;height:3px;background:var(--accent);border-radius:2px;margin-bottom:1rem}
h1.page-title em{font-style:normal;color:var(--accent);font-weight:700}
.lead{margin-top:1.05rem;font-family:var(--sans);font-size:1.16rem;line-height:1.6;color:var(--ink-soft);max-width:none;text-wrap:pretty}
.h2{font-family:var(--serif);font-weight:500;font-size:1.4rem;letter-spacing:-.01em;margin:2.5rem 0 1rem;padding-bottom:.5rem;border-bottom:1px solid var(--line-strong)}
.h2:first-of-type{margin-top:1.6rem}
.h2 em{font-style:normal;color:var(--accent);font-weight:500}
.h3{font-family:var(--serif);font-weight:500;font-size:1.12rem;letter-spacing:-.01em;margin:1.6rem 0 .7rem}
.prose p{font-family:var(--sans);font-size:1.04rem;line-height:1.72;color:var(--ink-soft);margin-bottom:1rem;max-width:none;font-variation-settings:'opsz' 18}
.prose p strong{color:var(--ink);font-weight:600}
.prose a,.inline-a{color:var(--accent);border-bottom:1px solid var(--accent-hair);transition:border-color .15s,color .15s}
.prose a:hover,.inline-a:hover{color:var(--accent-strong);border-bottom-color:var(--accent-strong)}
.muted{color:var(--ink-faint)}

/* ---- course meta strip ---- */
.course-meta{display:grid;grid-template-columns:repeat(4,1fr);gap:1.2rem;margin:1.9rem 0 .4rem;padding:1.3rem 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
@media (max-width:680px){.course-meta{grid-template-columns:repeat(2,1fr);gap:1rem}}
.course-meta .k{font-family:var(--mono);font-size:.62rem;letter-spacing:.2em;text-transform:uppercase;color:var(--ink-faint);margin-bottom:.34rem;font-weight:500;display:block}
.course-meta .v{font-family:var(--serif);font-size:1rem;color:var(--ink);font-variation-settings:'opsz' 18;line-height:1.3}
.course-meta .v em{font-style:italic;color:var(--ink-soft)}

/* ---- learning outcomes ---- */
.lo{list-style:none;display:grid;gap:.7rem;margin:.2rem 0 0}
.lo li{position:relative;padding-left:1.5rem;font-size:1.02rem;line-height:1.6;color:var(--ink)}
.lo li::before{content:"";position:absolute;left:0;top:.56em;width:.5rem;height:.5rem;background:var(--accent);border-radius:1px}
.lo li em{font-style:italic;color:var(--ink-soft)}

/* ---- schedule / generic table ---- */
table.schedule{width:100%;border-collapse:collapse;margin:.6rem 0;font-family:var(--sans);font-size:.92rem}
table.schedule th{text-align:left;font-family:var(--mono);font-size:.64rem;letter-spacing:.2em;text-transform:uppercase;color:var(--ink-faint);font-weight:500;padding:.7rem .8rem;border-bottom:1px solid var(--line-strong)}
table.schedule td{padding:.8rem .8rem;vertical-align:top;border-bottom:1px solid var(--line)}
table.schedule td.wk{font-family:var(--mono);font-size:.74rem;color:var(--accent);white-space:nowrap;width:104px}
table.schedule td.topic{font-family:var(--serif);font-size:1rem;font-weight:500;color:var(--ink);font-variation-settings:'opsz' 18}
table.schedule td.focus{color:var(--ink-soft);font-size:.84rem;line-height:1.5;font-family:var(--mono);white-space:nowrap}
table.schedule tr.band td{background:var(--paper-2);font-family:var(--mono);font-size:.66rem;letter-spacing:.18em;text-transform:uppercase;color:var(--accent-strong);font-weight:500;padding:.55rem .8rem;border-bottom:1px solid var(--line-strong)}
table.schedule tr.assess td{background:var(--accent-soft)}
table.schedule tr.assess td.wk,table.schedule tr.assess td.topic{color:var(--accent-strong)}
table.schedule tr:hover td{background:color-mix(in srgb,var(--paper) 55%,white)}
table.schedule tr.assess:hover td{background:var(--accent-soft)}
table.schedule tr.band:hover td{background:var(--paper-2)}
@media (max-width:680px){table.schedule td.focus{white-space:normal}.hide-sm{display:none}}

/* ---- software pills ---- */
.pills{display:flex;flex-wrap:wrap;gap:.45rem;margin:.2rem 0}
.pill{font-family:var(--mono);font-size:.66rem;letter-spacing:.08em;text-transform:uppercase;color:var(--accent-strong);background:var(--accent-soft);border:1px solid var(--accent-hair);border-radius:999px;padding:.28rem .65rem}

/* ---- resource grid (home hub) ---- */
.resource-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:.9rem;margin:.4rem 0}
@media (max-width:620px){.resource-grid{grid-template-columns:1fr}}
.resource-card{display:flex;align-items:flex-start;gap:.95rem;padding:1.1rem 1.15rem;border:1px solid var(--line-strong);border-radius:5px;background:#fff;transition:transform .16s ease,box-shadow .16s ease,border-color .16s ease}
.resource-card:hover{transform:translateY(-2px);box-shadow:0 12px 26px rgba(26,26,23,.1);border-color:var(--accent-hair)}
.resource-card .ic{flex:none;width:38px;height:38px;display:grid;place-items:center;border-radius:7px;background:var(--accent-soft);color:var(--accent);font-size:1rem}
.resource-card .rc-t{font-family:var(--serif);font-weight:600;font-size:1.1rem;color:var(--ink);letter-spacing:-.01em;display:flex;align-items:center;gap:.4rem}
.resource-card .rc-t i{font-size:.72rem;color:var(--accent);transition:transform .16s ease}
.resource-card:hover .rc-t i{transform:translateX(3px)}
.resource-card .rc-d{font-size:.9rem;color:var(--ink-soft);line-height:1.5;margin-top:.18rem}

/* ---- spotlight (interactive-companion promo, home hub) ---- */
.spotlight{display:grid;grid-template-columns:1fr 1.1fr;gap:2rem;align-items:center;margin:1.5rem 0 .3rem;padding:1.7rem 1.8rem;border:1px solid var(--line-strong);border-radius:8px;background:linear-gradient(155deg,#fff 0%,var(--accent-soft) 155%)}
@media (max-width:820px){.spotlight{grid-template-columns:1fr;padding:1.3rem 1.15rem 1.5rem;gap:1.3rem}}
.spotlight-kicker{font-family:var(--mono);font-size:.66rem;letter-spacing:.2em;text-transform:uppercase;color:var(--warn);display:flex;align-items:center;gap:.55rem;margin-bottom:.7rem}
.spotlight-kicker::before{content:"";width:22px;height:1px;background:var(--warn)}
.spotlight-copy h3{font-family:var(--serif);font-weight:600;font-size:1.44rem;letter-spacing:-.015em;color:var(--ink);line-height:1.18;margin-bottom:.65rem}
.spotlight-copy h3 em{font-style:normal;color:var(--accent)}
.spotlight-copy p{font-size:.98rem;line-height:1.62;color:var(--ink-soft)}
.spotlight-actions{display:flex;flex-wrap:wrap;gap:.6rem;margin-top:1.2rem}
.spotlight-btn{display:inline-flex;align-items:center;gap:.5rem;font-family:var(--sans);font-size:.87rem;font-weight:600;border-radius:6px;padding:.62rem 1.05rem;transition:transform .15s ease,box-shadow .15s ease,background-color .15s ease,border-color .15s ease}
.spotlight-btn.primary{background:var(--accent);color:#fff}
.spotlight-btn.primary:hover{background:var(--accent-strong);transform:translateY(-1px);box-shadow:0 10px 20px rgba(21,80,126,.22)}
.spotlight-btn.ghost{background:#fff;color:var(--ink);border:1px solid var(--line-strong)}
.spotlight-btn.ghost:hover{border-color:var(--accent-hair);transform:translateY(-1px);box-shadow:0 8px 18px rgba(26,26,23,.08)}
.spotlight-btn i{font-size:.76rem}
.spotlight-note{margin-top:.85rem;font-size:.78rem;color:var(--ink-faint);line-height:1.5}

/* browser-chrome mockup previewing the interactive page's own palette */
.sl-window{border-radius:9px;overflow:hidden;border:1px solid rgba(26,26,23,.14);box-shadow:0 22px 46px rgba(26,26,23,.16),0 3px 8px rgba(26,26,23,.06);background:#fff;transition:transform .2s ease}
.spotlight:hover .sl-window{transform:translateY(-2px)}
.sl-bar{display:flex;align-items:center;gap:.32rem;padding:.5rem .7rem;background:#ece9e1;border-bottom:1px solid rgba(26,26,23,.08)}
.sl-dot{width:7px;height:7px;border-radius:50%;background:#d3cfc4}
.sl-url{margin-left:.5rem;font-family:var(--mono);font-size:.6rem;color:#9c968a;letter-spacing:.01em;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.sl-body{padding:.85rem .9rem 1rem;background:var(--paper)}
.sl-stagebar{display:flex;gap:.4rem;padding-bottom:.55rem;margin-bottom:.55rem;border-bottom:1px solid rgba(26,26,23,.1)}
.sl-stage-dot{width:6px;height:6px;border-radius:50%;background:#fff;border:1.5px solid #8b867b}
.sl-stage-dot.active{background:#002147;border-color:#002147}
.sl-cap{font-family:var(--mono);font-size:.6rem;letter-spacing:.1em;text-transform:uppercase;color:#8b867b;margin-bottom:.5rem}
.sl-chart{width:100%;height:auto;display:block}
.sl-readout{display:grid;grid-template-columns:repeat(3,1fr);gap:.5rem;margin-top:.75rem;padding-top:.6rem;border-top:1px solid rgba(26,26,23,.1)}
.sl-ro-k{display:block;font-family:var(--mono);font-size:.56rem;letter-spacing:.08em;text-transform:uppercase;color:#8b867b}
.sl-ro-v{display:block;font-family:var(--serif);font-size:.86rem;color:#1a1a17;margin-top:.12rem;font-weight:600}

/* ---- module accordion (the modules page) ---- */
.legend{display:flex;flex-wrap:wrap;gap:.5rem .9rem;margin:.4rem 0 1.3rem;padding:.7rem .9rem;border:1px solid var(--line);border-radius:5px;background:var(--paper)}
.legend .lg{display:inline-flex;align-items:center;gap:.42rem;font-family:var(--mono);font-size:.64rem;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-soft)}
.legend .dot{width:.6rem;height:.6rem;border-radius:50%}
.dot.lecture{background:var(--accent)}.dot.lab{background:var(--good)}.dot.assess{background:var(--warn)}

.toolbar{display:flex;align-items:center;justify-content:space-between;gap:.8rem;margin:.2rem 0 1rem;flex-wrap:wrap}
.toolbar .count{font-family:var(--mono);font-size:.68rem;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-faint)}
.btn-ghost{font-family:var(--mono);font-size:.66rem;letter-spacing:.1em;text-transform:uppercase;color:var(--accent);background:none;border:1px solid var(--accent-hair);border-radius:4px;padding:.42rem .7rem;cursor:pointer;transition:background-color .15s,color .15s}
.btn-ghost:hover{background:var(--accent);color:#fff}

.modules{display:grid;gap:.75rem}
.module{border:1px solid var(--line-strong);border-radius:6px;overflow:hidden;background:#fff;transition:box-shadow .16s ease}
.module:hover{box-shadow:0 8px 22px rgba(26,26,23,.07)}
.module.lab{border-left:3px solid var(--good)}
.module.lecture{border-left:3px solid var(--accent)}
.m-head{display:flex;align-items:center;gap:.9rem;padding:.95rem 1.05rem;cursor:pointer;user-select:none;background:#fff;transition:background-color .15s}
.m-head:hover{background:var(--paper)}
.m-num{flex:none;width:2.05rem;height:2.05rem;display:grid;place-items:center;border-radius:6px;background:var(--accent-soft);color:var(--accent-strong);font-family:var(--mono);font-size:.78rem;font-weight:600}
.module.lab .m-num{background:var(--good-soft);color:var(--good)}
.m-meta{flex:1;min-width:0}
.m-title{font-family:var(--serif);font-weight:600;font-size:1.06rem;color:var(--ink);letter-spacing:-.01em;line-height:1.25}
.m-sub{font-family:var(--mono);font-size:.66rem;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-faint);margin-top:.22rem;display:flex;flex-wrap:wrap;gap:.35rem .7rem}
.m-sub .ch{color:var(--accent)}
.m-badges{display:flex;gap:.35rem;flex:none}
.badge{font-family:var(--mono);font-size:.58rem;letter-spacing:.1em;text-transform:uppercase;padding:.22rem .5rem;border-radius:4px;font-weight:500;white-space:nowrap}
.badge.lecture{background:var(--accent-soft);color:var(--accent-strong)}
.badge.lab{background:var(--good-soft);color:var(--good)}
.m-chev{flex:none;color:var(--ink-faint);font-size:.85rem;transition:transform .2s ease;margin-left:.2rem}
.module[open] .m-chev,.module.open .m-chev{transform:rotate(180deg)}

.m-body{padding:0 1.05rem;max-height:0;overflow:hidden;transition:max-height .28s ease,padding .28s ease}
.module.open .m-body{max-height:2600px;padding:.2rem 1.05rem 1.15rem}
.m-summary{font-size:.96rem;line-height:1.6;color:var(--ink-soft);margin:.3rem 0 1rem;padding-left:.1rem}
.m-summary b{color:var(--ink);font-weight:600}

/* interactive-companion strip (independent of the lecture release gate) */
.interactive-strip{display:flex;align-items:center;gap:.9rem;flex-wrap:wrap;margin:0 0 1rem;padding:.85rem .95rem;border:1px solid rgba(154,106,24,.28);border-radius:6px;background:var(--warn-soft)}
.interactive-strip .int-ic{flex:none;width:34px;height:34px;display:grid;place-items:center;border-radius:6px;background:#fff;color:var(--warn);font-size:.92rem}
.interactive-strip .int-meta{flex:1 1 180px;min-width:160px}
.interactive-strip .int-title{font-family:var(--serif);font-weight:600;font-size:.98rem;color:var(--ink);letter-spacing:-.01em}
.interactive-strip .int-actions{display:flex;gap:.4rem;flex-wrap:wrap;align-items:flex-start}
@media (max-width:560px){.interactive-strip{padding:.8rem}.interactive-strip .int-actions{width:100%}.interactive-strip .int-actions .mat-btn{flex:1;justify-content:center}}

.mat-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:.9rem}
@media (max-width:680px){.mat-grid{grid-template-columns:1fr}}
.mat-group{border:1px solid var(--line);border-radius:5px;padding:.8rem .85rem;background:var(--paper)}
.mat-group h4{font-family:var(--mono);font-size:.62rem;letter-spacing:.16em;text-transform:uppercase;color:var(--ink-faint);font-weight:500;margin-bottom:.6rem;display:flex;align-items:center;gap:.45rem}
.mat-group h4 i{color:var(--accent);font-size:.7rem}
.mat-row{display:flex;flex-wrap:wrap;gap:.4rem}

/* asset buttons */
.mat-btn{display:inline-flex;align-items:center;gap:.45rem;font-family:var(--sans);font-size:.82rem;font-weight:500;color:var(--ink);background:#fff;border:1px solid var(--line-strong);border-radius:5px;padding:.42rem .68rem;transition:transform .14s ease,box-shadow .14s ease,border-color .14s ease,background-color .14s ease;line-height:1.1}
.mat-btn i,.mat-btn svg{font-size:.85rem;flex:none}
.mat-btn:hover{transform:translateY(-1px);box-shadow:0 6px 14px rgba(26,26,23,.1);border-color:var(--accent-hair)}
.mat-btn .sz{font-family:var(--mono);font-size:.62rem;color:var(--ink-faint);letter-spacing:.04em}
.mat-btn.primary{background:var(--accent);color:#fff;border-color:var(--accent)}
.mat-btn.primary:hover{background:var(--accent-strong)}
.mat-btn.primary .sz{color:rgba(255,255,255,.7)}
.mat-btn .i-colab{color:#e8710a}
.mat-btn .i-python{color:#3776ab}
.mat-btn .i-stata{color:#1a5276}
.mat-btn .i-data{color:var(--good)}
.mat-btn .i-pdf{color:#b23b3b}
.mat-btn.disabled{opacity:.5;cursor:not-allowed;pointer-events:none;background:var(--paper-2)}
.mat-note{font-size:.74rem;color:var(--ink-faint);margin-top:.5rem;font-style:italic}

/* ---- result lookup ---- */
.result-cta{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:.95rem;margin:1.35rem 0 .35rem;padding:1rem 1.1rem;border:1px solid var(--accent);border-radius:6px;background:var(--accent);color:#fff;box-shadow:0 12px 28px rgba(21,80,126,.18);transition:transform .16s ease,box-shadow .16s ease,background-color .16s ease}
.result-cta:hover{transform:translateY(-2px);box-shadow:0 18px 34px rgba(21,80,126,.24);background:var(--accent-strong)}
.result-cta-ic{width:42px;height:42px;display:grid;place-items:center;border-radius:6px;background:rgba(255,255,255,.14);font-size:1.05rem;flex:none}
.result-cta-title{display:block;font-family:var(--serif);font-weight:700;font-size:1.18rem;letter-spacing:-.01em;line-height:1.2}
.result-cta-text{display:block;margin-top:.16rem;font-size:.9rem;color:rgba(255,255,255,.78);line-height:1.35}
.result-cta-arrow{font-size:.9rem;color:rgba(255,255,255,.78)}
.result-panel{margin:1.5rem 0 .8rem;border:1px solid var(--line-strong);border-radius:6px;background:var(--paper);padding:1.1rem}
.result-form label{display:block;font-family:var(--mono);font-size:.66rem;letter-spacing:.16em;text-transform:uppercase;color:var(--ink-faint);margin-bottom:.45rem}
.result-search-row{display:grid;grid-template-columns:1fr auto;gap:.55rem;align-items:center}
.result-search-row input{width:100%;min-height:42px;border:1px solid var(--line-strong);border-radius:5px;background:#fff;color:var(--ink);font-family:var(--sans);font-size:1rem;padding:.52rem .7rem;outline:none;transition:border-color .15s,box-shadow .15s}
.result-search-row input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
.result-output{margin-top:.9rem;border:1px solid var(--line);border-radius:5px;background:#fff;padding:.9rem 1rem;display:grid;gap:.2rem}
.result-output .result-label{font-family:var(--mono);font-size:.62rem;letter-spacing:.16em;text-transform:uppercase;color:var(--ink-faint)}
.result-output .result-score{font-family:var(--serif);font-weight:700;font-size:2.3rem;line-height:1.05;color:var(--accent-strong)}
.result-output .result-empty,.result-output .result-message{font-size:.95rem;color:var(--ink-soft)}
.result-output.error{border-color:rgba(154,106,24,.35);background:var(--warn-soft)}
.result-output.error .result-message{color:var(--warn)}
@media (max-width:620px){
  .result-cta{grid-template-columns:auto 1fr;padding:.9rem}
  .result-cta-arrow{display:none}
  .result-search-row{grid-template-columns:1fr}
  .result-search-row .mat-btn{justify-content:center}
}

/* ---- problem-set list ---- */
.ps-list{display:grid;gap:.7rem;margin:.4rem 0}
.ps-item{border:1px solid var(--line-strong);border-radius:6px;padding:.95rem 1.05rem;background:#fff;display:grid;grid-template-columns:1fr auto;gap:.7rem 1rem;align-items:center;transition:box-shadow .16s ease,border-color .16s ease}
.ps-item:hover{box-shadow:0 8px 20px rgba(26,26,23,.07);border-color:var(--accent-hair)}
.ps-item .ps-meta{min-width:0}
.ps-item .ps-tag{font-family:var(--mono);font-size:.62rem;letter-spacing:.1em;text-transform:uppercase;color:var(--accent)}
.ps-item .ps-t{font-family:var(--serif);font-weight:600;font-size:1.04rem;color:var(--ink);letter-spacing:-.01em;margin:.18rem 0 .12rem}
.ps-item .ps-d{font-size:.86rem;color:var(--ink-soft);line-height:1.45}
.ps-item .ps-d code{font-family:var(--mono);font-size:.8em;color:var(--accent-strong);background:var(--accent-soft);padding:.05rem .3rem;border-radius:3px}
.ps-item .ps-act{display:flex;flex-wrap:wrap;gap:.4rem;justify-content:flex-end}
@media (max-width:620px){.ps-item{grid-template-columns:1fr}.ps-item .ps-act{justify-content:flex-start}}

/* ---- callout / notice ---- */
.notice{padding:.85rem 1rem;border-left:3px solid var(--accent);background:var(--accent-soft);border-radius:0 4px 4px 0;font-size:.92rem;line-height:1.55;color:var(--ink);margin:1rem 0}
.notice b{color:var(--accent-strong)}
.notice.warn{border-left-color:var(--warn);background:var(--warn-soft)}
.notice.warn b{color:var(--warn)}

/* ---- two-column cards (exams topics) ---- */
.split{display:grid;grid-template-columns:1fr 1fr;gap:.9rem;margin:.4rem 0}
@media (max-width:680px){.split{grid-template-columns:1fr}}
.panel{border:1px solid var(--line-strong);border-radius:6px;padding:1.05rem 1.1rem;background:#fff}
.panel h4{font-family:var(--serif);font-weight:600;font-size:1.05rem;color:var(--ink);margin-bottom:.55rem;letter-spacing:-.01em}
.panel ul{list-style:none;display:grid;gap:.42rem}
.panel ul li{position:relative;padding-left:1.2rem;font-size:.92rem;line-height:1.5;color:var(--ink-soft)}
.panel ul li::before{content:"";position:absolute;left:0;top:.55em;width:.4rem;height:.4rem;background:var(--accent);border-radius:50%}

/* ---- lecture session cards (syllabus) ---- */
.session{padding:1.25rem 0;border-bottom:1px solid var(--line)}
.session:last-child{border-bottom:none}
.session .s-num{font-family:var(--mono);font-size:.68rem;letter-spacing:.16em;color:var(--accent);text-transform:uppercase}
.session h3{font-family:var(--serif);font-weight:500;font-size:1.18rem;margin:.3rem 0 .5rem;letter-spacing:-.01em;font-variation-settings:'opsz' 24}
.session p{font-size:1rem;line-height:1.65;color:var(--ink-soft)}
.session .key{margin-top:.75rem;padding:.7rem .95rem;border-left:2px solid var(--accent);background:var(--accent-soft);font-size:.95rem;line-height:1.55;color:var(--ink);border-radius:0 3px 3px 0}
.session .key b{color:var(--accent-strong);font-weight:600}
.session em{font-style:italic;color:var(--ink-soft)}

/* ---- grading scale grid ---- */
.grades{display:grid;grid-template-columns:repeat(5,1fr);gap:.5rem;margin:.4rem 0}
@media (max-width:560px){.grades{grid-template-columns:repeat(3,1fr)}}
.grade{border:1px solid var(--line-strong);border-radius:5px;padding:.6rem .5rem;text-align:center;background:#fff}
.grade .g{font-family:var(--serif);font-weight:700;font-size:1.15rem;color:var(--accent-strong)}
.grade .r{font-family:var(--mono);font-size:.62rem;color:var(--ink-faint);letter-spacing:.04em;margin-top:.15rem}

/* ---- reading list ---- */
.reading{list-style:none;counter-reset:r;display:grid;gap:.75rem;margin-top:.4rem}
.reading li{position:relative;padding-left:2.2rem;font-size:.93rem;line-height:1.55;color:var(--ink-soft)}
.reading li::before{counter-increment:r;content:counter(r);position:absolute;left:0;top:.04rem;font-family:var(--mono);font-size:.72rem;color:var(--accent);font-weight:500;border:1px solid var(--accent-hair);border-radius:3px;width:1.55rem;height:1.55rem;display:flex;align-items:center;justify-content:center}
.reading li cite{font-style:italic;color:var(--ink)}
.reading li .note{color:var(--ink-faint)}
.reading li code{font-family:var(--mono);font-size:.82em;color:var(--ink)}
.reading li a{color:var(--accent);border-bottom:1px solid var(--accent-hair);word-break:break-word}
.reading li a:hover{color:var(--accent-strong)}

/* ---- bottom section nav (footer-nav.js targets this) ---- */
.index-nav{display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid var(--line-strong);border-bottom:1px solid var(--line)}
.index-card{display:flex;flex-direction:column;gap:1.3rem;padding:1.15rem 1.25rem 1.1rem;border-left:1px solid var(--line);color:var(--ink);transition:background-color .16s ease,color .16s ease}
.index-card:first-child{border-left:0}
.idx-top{display:flex;align-items:center;justify-content:space-between}
.idx-num{font-family:var(--mono);font-size:.74rem;font-weight:500;letter-spacing:.16em;color:var(--ink-faint)}
.idx-arrow{font-size:.78rem;color:var(--accent);transition:transform .16s ease,color .16s ease}
.idx-label{display:inline-flex;align-items:center;gap:.55rem;font-family:var(--serif);font-size:1.25rem;font-weight:600;letter-spacing:-.025em;color:var(--ink)}
.idx-label i{font-size:.86rem;color:var(--accent);transition:color .16s ease}
.index-card:hover{background:var(--accent);color:#fff}
.index-card:hover .idx-num,.index-card:hover .idx-arrow,.index-card:hover .idx-label,.index-card:hover .idx-label i{color:#fff}
.index-card:hover .idx-arrow{transform:translateX(4px)}
@media (max-width:620px){.index-nav{grid-template-columns:1fr}.index-card{flex-direction:row;align-items:center;justify-content:space-between;gap:1rem;padding:.9rem 1rem;border-left:0;border-top:1px solid var(--line)}.index-card:first-child{border-top:0}.idx-top{order:2}.idx-arrow{display:none}.idx-label{font-size:1.08rem}}

/* ---- footer ---- */
.foot{display:flex;align-items:center;justify-content:space-between;gap:.7rem 1rem;padding:.95rem 2rem 1.05rem;background:#e6e3da}
.foot-loc{font-family:var(--mono);font-size:.7rem;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-faint)}
.foot-links{display:flex;gap:1rem;flex-wrap:wrap;font-family:var(--mono);font-size:.7rem;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-faint)}
.foot-links a:hover{color:var(--accent)}
@media (max-width:620px){.foot{flex-direction:column;align-items:flex-start;gap:.6rem;padding:.85rem 1rem .95rem}}
.oxford-stamp{display:inline-flex;align-items:center;justify-content:center;padding:.25rem .5rem;border-radius:4px;line-height:0}
.oxford-stamp img{width:124px;opacity:.42;filter:grayscale(.2);transition:opacity .18s ease}
.oxford-stamp:hover img{opacity:.78}

@media (max-width:620px){
  .page{padding:.7rem .45rem 1rem}
  h1.page-title{font-size:1.7rem;line-height:1.08;letter-spacing:-.02em}
  .lead{font-size:1rem;line-height:1.55}
  .prose p,.lo li{font-size:.96rem;line-height:1.58}
}

/* ==========================================================================
   Case Studies section (casestudies/) -- namespaced .cs- additions
   ========================================================================== */

/* ---- stat row (hub hero) ---- */
.cs-stat-row{display:flex;flex-wrap:wrap;gap:1.6rem;margin:1.3rem 0 .3rem;padding:1.1rem 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.cs-stat{display:flex;flex-direction:column;gap:.15rem}
.cs-stat .n{font-family:var(--serif);font-weight:700;font-size:1.7rem;color:var(--accent-strong);line-height:1}
.cs-stat .l{font-family:var(--mono);font-size:.62rem;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-faint)}

/* ---- chips / tags (shared by hub tables and case-page headers) ---- */
.cs-chips{display:flex;flex-wrap:wrap;gap:.4rem;margin:.9rem 0 0}
.cs-chip{display:inline-flex;align-items:center;gap:.3rem;font-family:var(--mono);font-size:.62rem;letter-spacing:.08em;text-transform:uppercase;padding:.24rem .55rem;border-radius:4px;background:var(--paper-2);color:var(--ink-soft);white-space:nowrap}
.cs-chip--yr{background:none;color:var(--ink-faint);padding-left:0}
.cs-chip--topic{background:var(--accent-soft);color:var(--accent-strong)}
a.cs-chip--topic:hover{background:var(--accent);color:#fff}
.cs-chip--cn{background:var(--warn-soft);color:var(--warn);font-weight:600}
.cs-chip--tier2{background:var(--paper-2);color:var(--ink-faint)}
.cs-chip--theme{background:#fff;border:1px solid var(--line-strong);color:var(--ink-soft)}
.cs-chip--inst{background:var(--good-soft);color:var(--good)}

/* ---- filter bar ---- */
.cs-filters{margin:1.4rem 0;padding:1.15rem 1.25rem;border:1px solid var(--line-strong);border-radius:8px;background:var(--paper);display:grid;gap:.95rem}
.cs-filter-row--main{display:flex;flex-wrap:wrap;gap:.65rem;align-items:center}
.cs-search{position:relative;flex:1 1 220px;display:flex;align-items:center}
.cs-search i{position:absolute;left:.85rem;color:var(--ink-faint);font-size:.82rem;pointer-events:none}
.cs-search input{width:100%;padding:.58rem .8rem .58rem 2.3rem;border:1px solid var(--line-strong);border-radius:999px;font-family:var(--sans);font-size:.9rem;background:#fff;color:var(--ink)}
.cs-search input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
.cs-search input::placeholder{color:var(--ink-faint)}
.cs-china-toggle{display:inline-flex;align-items:center;gap:.55rem;font-family:var(--sans);font-weight:600;font-size:.86rem;color:var(--warn);background:var(--warn-soft);border:1.5px solid rgba(154,106,24,.35);border-radius:999px;padding:.55rem 1.1rem;cursor:pointer;transition:background-color .15s ease,color .15s ease;white-space:nowrap}
.cs-china-toggle i{font-size:.82rem}
.cs-china-toggle .cs-china-count{font-family:var(--mono);font-size:.68rem;background:rgba(154,106,24,.15);padding:.1rem .45rem;border-radius:999px}
.cs-china-toggle:hover{background:rgba(154,106,24,.16)}
.cs-china-toggle.active{background:var(--warn);color:#fff;border-color:var(--warn)}
.cs-china-toggle.active .cs-china-count{background:rgba(255,255,255,.25)}
.cs-clear-btn{font-family:var(--mono);font-size:.64rem;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-faint);background:none;border:1px solid var(--line-strong);border-radius:999px;padding:.5rem .85rem;cursor:pointer;transition:all .15s ease;white-space:nowrap}
.cs-clear-btn:hover{color:var(--accent);border-color:var(--accent-hair);background:var(--accent-soft)}
.cs-clear-btn:disabled{opacity:.4;cursor:not-allowed}
.cs-filter-group{display:flex;align-items:flex-start;gap:.75rem;flex-wrap:wrap}
.cs-filter-label{flex:none;font-family:var(--mono);font-size:.6rem;letter-spacing:.13em;text-transform:uppercase;color:var(--ink-faint);padding-top:.55rem;width:64px}
.cs-chip-row{display:flex;flex-wrap:wrap;gap:.4rem;flex:1;min-width:0}
.cs-filter-btn{font-family:var(--mono);font-size:.7rem;letter-spacing:.03em;color:var(--ink-soft);background:#fff;border:1px solid var(--line-strong);border-radius:999px;padding:.36rem .8rem;cursor:pointer;transition:all .15s ease}
.cs-filter-btn:hover{border-color:var(--accent-hair);color:var(--accent)}
.cs-filter-btn.active{background:var(--accent);color:#fff;border-color:var(--accent)}
.cs-filter-btn--lecture{border-radius:50%;width:2.05rem;height:2.05rem;padding:0;display:inline-flex;align-items:center;justify-content:center;font-weight:600}

/* ---- results bar ---- */
.cs-results-bar{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:.7rem;margin:1.3rem 0 .9rem}
.cs-results-count{font-family:var(--mono);font-size:.68rem;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-faint)}
.cs-view-toggle{display:flex;border:1px solid var(--line-strong);border-radius:6px;overflow:hidden}
.cs-view-btn{font-family:var(--mono);font-size:.64rem;letter-spacing:.07em;text-transform:uppercase;color:var(--ink-soft);background:#fff;border:none;padding:.5rem .9rem;cursor:pointer}
.cs-view-btn:not(:last-child){border-right:1px solid var(--line-strong)}
.cs-view-btn.active{background:var(--accent);color:#fff}
.cs-expand-all{font-family:var(--mono);font-size:.64rem;letter-spacing:.07em;text-transform:uppercase;color:var(--accent);background:none;border:1px solid var(--accent-hair);border-radius:6px;padding:.5rem .8rem;cursor:pointer}
.cs-expand-all:hover{background:var(--accent-soft)}
.cs-no-results{padding:2rem 1rem;text-align:center;color:var(--ink-faint);font-size:.94rem}

/* ---- case cards ---- */
.cs-card-grid{display:flex;flex-direction:column;gap:.55rem;margin:.2rem 0}
.cs-card{display:grid;grid-template-columns:2.6rem 1fr;gap:.9rem;padding:.8rem 1.05rem;border:1px solid var(--line-strong);border-radius:6px;background:#fff;transition:box-shadow .15s ease,border-color .15s ease}
.cs-card:hover{box-shadow:0 8px 20px rgba(26,26,23,.07);border-color:var(--accent-hair)}
.cs-card-yr{font-family:var(--mono);font-size:.74rem;color:var(--accent);letter-spacing:.02em;padding-top:.15rem}
.cs-card-main{min-width:0}
.cs-card-top{display:flex;align-items:center;gap:.5rem;flex-wrap:wrap}
.cs-card-cn{display:inline-flex;align-items:center;gap:.3rem;font-family:var(--mono);font-size:.58rem;letter-spacing:.07em;text-transform:uppercase;color:var(--warn);background:var(--warn-soft);padding:.16rem .5rem;border-radius:999px;font-weight:600;flex:none}
.cs-card-title{font-family:var(--serif);font-weight:600;font-size:.98rem;color:var(--ink);letter-spacing:-.008em;line-height:1.3}
.cs-card:hover .cs-card-title{color:var(--accent)}
.cs-card-desc{font-size:.84rem;color:var(--ink-soft);line-height:1.5;margin-top:.25rem}
.cs-card-tags{display:flex;flex-wrap:wrap;gap:.32rem;margin-top:.5rem}
.cs-card-tags .cs-chip{font-size:.58rem;padding:.16rem .5rem}
@media (max-width:560px){.cs-card{grid-template-columns:1fr;gap:.3rem}.cs-card-yr{padding-top:0}}

.cs-card--compact{align-items:center;gap:.8rem;padding:.65rem .9rem}
.cs-card--compact .cs-card-yr{padding-top:0}
.cs-card--compact .cs-card-main{display:flex;align-items:center;gap:.6rem;flex-wrap:wrap}
.cs-card--compact .cs-card-title{font-size:.9rem}
.cs-card--compact .cs-card-note{font-size:.68rem;color:var(--ink-faint);font-family:var(--mono);white-space:nowrap;flex:none}

/* ---- lecture accordion group ---- */
.cs-lecture-group{border:1px solid var(--line-strong);border-radius:8px;overflow:hidden;background:#fff;margin-bottom:.75rem;transition:box-shadow .15s ease}
.cs-lecture-group:hover{box-shadow:0 6px 16px rgba(26,26,23,.06)}
.cs-lg-head{display:flex;align-items:center;gap:.9rem;padding:.9rem 1.1rem;cursor:pointer;user-select:none;background:var(--paper-2);transition:background-color .15s}
.cs-lg-head:hover{background:var(--paper-3)}
.cs-lg-num{flex:none;width:2rem;height:2rem;display:grid;place-items:center;border-radius:6px;background:var(--accent-soft);color:var(--accent-strong);font-family:var(--mono);font-size:.76rem;font-weight:600}
.cs-lg-meta{flex:1;min-width:0}
.cs-lg-title{font-family:var(--serif);font-weight:600;font-size:.98rem;color:var(--ink)}
.cs-lg-count{font-family:var(--mono);font-size:.62rem;color:var(--ink-faint);text-transform:uppercase;letter-spacing:.08em;margin-top:.1rem;display:block}
.cs-lg-chev{flex:none;color:var(--ink-faint);transition:transform .2s ease}
.cs-lecture-group.open .cs-lg-chev{transform:rotate(180deg)}
.cs-lg-body{max-height:0;overflow:hidden;transition:max-height .3s ease}
.cs-lecture-group.open .cs-lg-body{max-height:5000px}
.cs-lg-inner{padding:1.05rem}
.cs-lg-also{margin-top:.9rem;padding-top:.9rem;border-top:1px dashed var(--line);display:grid;gap:.4rem}
.cs-lg-also-label{font-family:var(--mono);font-size:.6rem;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-faint);margin-bottom:.15rem;display:block}

/* ---- timeline strip (hub, added value) ---- */
.cs-timeline-wrap{position:relative}
.cs-timeline-outer{margin:1rem 0 2rem;border:1px solid var(--line-strong);border-radius:6px;background:var(--paper);padding:1.2rem 1.2rem 1rem;overflow-x:auto;overflow-y:hidden}
.cs-tl-popover{position:absolute;top:.6rem;right:.6rem;width:min(320px,calc(100% - 1.2rem));background:#fff;border:1px solid var(--line-strong);border-radius:8px;box-shadow:0 16px 36px rgba(26,26,23,.18);padding:1rem 1.2rem 1.05rem;z-index:20}
.cs-tl-popover[hidden]{display:none}
.cs-tl-popover-close{position:absolute;top:.5rem;right:.55rem;background:none;border:none;font-size:1.2rem;line-height:1;color:var(--ink-faint);cursor:pointer;padding:.2rem;font-family:var(--sans)}
.cs-tl-popover-close:hover{color:var(--accent)}
.cs-tl-popover-yr{font-family:var(--mono);font-size:.68rem;color:var(--accent);letter-spacing:.06em}
.cs-tl-popover-cn{margin-left:.5rem;display:inline-flex;align-items:center;gap:.3rem;font-family:var(--mono);font-size:.58rem;letter-spacing:.07em;text-transform:uppercase;color:var(--warn);background:var(--warn-soft);padding:.14rem .45rem;border-radius:999px;font-weight:600}
.cs-tl-popover-title{font-family:var(--serif);font-weight:600;font-size:1rem;color:var(--ink);margin:.35rem 1rem .45rem 0;line-height:1.3}
.cs-tl-popover-desc{font-size:.85rem;color:var(--ink-soft);line-height:1.5;margin-bottom:.7rem}
.cs-tl-popover-link{display:inline-flex;align-items:center;gap:.35rem;font-family:var(--mono);font-size:.68rem;letter-spacing:.08em;text-transform:uppercase;color:var(--accent);font-weight:600}
.cs-tl-popover-link:hover{color:var(--accent-strong)}
@media (max-width:620px){.cs-tl-popover{right:.6rem;left:.6rem;width:auto}}
.cs-timeline{position:relative;min-width:1400px;margin:0 1rem}
.cs-tl-track{position:absolute;left:0;right:0;height:2px;background:var(--line-strong)}
.cs-tl-item{position:absolute;display:flex;flex-direction:column;align-items:center;gap:.2rem;transform:translate(-50%,-50%);text-decoration:none;width:2.6rem}
.cs-tl-item .dot{width:.6rem;height:.6rem;border-radius:50%;background:var(--accent);border:2px solid var(--paper);box-shadow:0 0 0 1px var(--accent);flex:none;transition:transform .12s ease}
.cs-tl-item.cn .dot{background:var(--warn);box-shadow:0 0 0 1px var(--warn)}
.cs-tl-item .yr{font-family:var(--mono);font-size:.6rem;color:var(--ink-faint);white-space:nowrap;transition:color .12s ease}
.cs-tl-item:hover .dot,.cs-tl-item:focus-visible .dot{transform:scale(1.5)}
.cs-tl-item:hover .yr,.cs-tl-item:focus-visible .yr{color:var(--accent);font-weight:600}
.cs-tl-item.cs-tl-dim{opacity:.2}
.cs-tl-item.cs-tl-dim:hover{opacity:.55}
.cs-timeline-legend{display:flex;gap:1.1rem;margin-top:.6rem;font-family:var(--mono);font-size:.62rem;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-faint)}
.cs-timeline-legend .dot{display:inline-block;width:.5rem;height:.5rem;border-radius:50%;margin-right:.35rem;vertical-align:middle}
.cs-timeline-legend .dot.cn{background:var(--warn)}
.cs-timeline-legend .dot.g{background:var(--accent)}

/* ---- case detail page: header chips already covered by .cs-chips above ---- */

/* ---- at-a-glance (plain label/value rows, small inline icons, no boxes) ---- */
.cs-glance{margin:1.35rem 0 1.5rem}
.cs-glance-row{display:grid;grid-template-columns:150px 1fr;gap:1.1rem;padding:.65rem 0;border-bottom:1px solid var(--line)}
.cs-glance-row:first-child{padding-top:0}
.cs-glance-k{font-family:var(--mono);font-size:.66rem;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-faint);display:flex;align-items:center;gap:.5rem;line-height:1.4}
.cs-glance-k i{color:var(--accent);font-size:.8rem;width:1rem;text-align:center;flex:none}
.cs-glance-v{font-size:.96rem;color:var(--ink);line-height:1.55}
.cs-glance-row.cs-glance-size{border-bottom:2px solid var(--line-strong)}
.cs-glance-row.cs-glance-size .cs-glance-k,.cs-glance-row.cs-glance-size .cs-glance-k i{color:var(--warn)}
.cs-glance-row.cs-glance-size .cs-glance-v{font-family:var(--serif);font-weight:600;font-size:1.04rem;color:var(--ink);font-variation-settings:'opsz' 18}
.cs-glance-lesson{margin-top:1rem}
.cs-glance-lesson i{margin-right:.3rem}
@media (max-width:640px){
  .cs-glance-row{grid-template-columns:1fr;gap:.25rem;padding:.8rem 0}
}

/* ---- figure card ---- */
.cs-fig{margin:1.3rem 0;border:1px solid var(--line-strong);border-radius:6px;overflow:hidden;background:#fff}
.cs-fig img{width:100%;display:block}
.cs-fig figcaption{font-family:var(--mono);font-size:.7rem;color:var(--ink-faint);padding:.65rem 1rem;border-top:1px solid var(--line);line-height:1.5}

/* ---- maths block ---- */
.cs-maths{margin:1.1rem 0;padding:1.1rem 1.2rem;border:1px solid var(--line-strong);border-left:3px solid var(--accent);border-radius:0 6px 6px 0;background:var(--paper);overflow-x:auto}
.cs-maths + .cs-maths-note{font-size:.86rem;color:var(--ink-faint);margin-top:-.6rem;margin-bottom:1rem;font-style:italic}

/* ---- verification code (Prism.js syntax highlighting) ---- */
/* ---- data and facts table (source column always visible) ---- */
table.cs-facts{width:100%;border-collapse:collapse;margin:.6rem 0 1.6rem;font-family:var(--sans);font-size:.88rem;table-layout:fixed}
table.cs-facts th{text-align:left;font-family:var(--mono);font-size:.6rem;letter-spacing:.13em;text-transform:uppercase;color:var(--ink-faint);font-weight:500;padding:.6rem .7rem;border-bottom:1px solid var(--line-strong)}
table.cs-facts td{padding:.65rem .7rem;vertical-align:top;border-bottom:1px solid var(--line);overflow-wrap:break-word}
table.cs-facts th:nth-child(1),table.cs-facts td.cs-fq{width:32%}
table.cs-facts th:nth-child(2),table.cs-facts td.cs-fv{width:20%}
table.cs-facts th:nth-child(3),table.cs-facts td.cs-fs{width:48%}
table.cs-facts td.cs-fq{font-family:var(--serif);font-weight:500;color:var(--ink);font-size:.92rem;line-height:1.4}
table.cs-facts td.cs-fv{font-family:var(--mono);font-size:.87rem;color:var(--accent-strong);font-weight:600}
table.cs-facts td.cs-fs{color:var(--ink-faint);font-size:.78rem;line-height:1.45}
table.cs-facts tr:hover td{background:color-mix(in srgb,var(--paper) 55%,white)}
@media (max-width:680px){
  table.cs-facts thead{display:none}
  table.cs-facts,table.cs-facts tbody,table.cs-facts tr,table.cs-facts td{display:block;width:auto!important}
  table.cs-facts tr{padding:.7rem 0;border-bottom:1px solid var(--line-strong)}
  table.cs-facts td{padding:.15rem 0;border-bottom:none}
  table.cs-facts td.cs-fq{font-weight:600;font-size:.94rem}
  table.cs-facts td.cs-fv{font-size:.95rem}
  table.cs-facts td.cs-fs::before{content:"Source: ";font-family:var(--mono);font-size:.6rem;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-faint)}
}

.cs-code-label{display:flex;align-items:center;gap:.5rem;font-family:var(--mono);font-size:.66rem;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-faint);margin:1.1rem 0 .5rem}
.cs-code-output-label{font-family:var(--mono);font-size:.6rem;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-faint);margin:.8rem 0 .4rem}
pre.cs-code-output{border-style:dashed;background:var(--paper-2)!important}
pre.cs-code-output code{color:var(--ink-soft);font-family:var(--mono);font-size:.82rem}
.cs-code-label i{color:var(--accent)}
pre.cs-code{margin:0 0 .3rem;border:1px solid var(--line-strong);border-radius:6px;overflow-x:auto;background:#faf9f6 !important}
pre.cs-code,pre.cs-code[class*="language-"]{font-family:var(--mono);font-size:.82rem;line-height:1.65;padding:1rem 1.2rem;text-shadow:none}
pre.cs-code code[class*="language-"]{font-family:var(--mono);text-shadow:none}
.token.comment{color:var(--ink-faint) !important;font-style:italic}
.token.number{color:var(--accent-strong) !important}
.token.operator{color:var(--ink-soft) !important;background:none !important}
.token.keyword{color:var(--warn) !important}
.token.string{color:var(--good) !important}
.token.builtin,.token.function{color:var(--accent) !important}

/* ---- think-about-it callout ---- */
.cs-think{margin:1.3rem 0;padding:1rem 1.15rem;border:1px dashed var(--accent-hair);border-radius:6px;background:#fff}
.cs-think h4{font-family:var(--serif);font-weight:600;font-size:1rem;color:var(--accent-strong);margin-bottom:.5rem}
.cs-think ol{padding-left:1.2rem;display:grid;gap:.5rem}
.cs-think li{font-size:.94rem;line-height:1.5;color:var(--ink-soft)}

/* ---- case cross-link row (where it appears) ---- */
.cs-links{display:flex;flex-wrap:wrap;gap:.5rem;margin:.6rem 0 0}

/* ---- per-page table of contents ---- */
.cs-toc{margin:1.3rem 0 1.6rem;padding:1.05rem 1.2rem;border:1px solid var(--line-strong);border-radius:8px;background:var(--paper)}
.cs-toc-label{display:block;font-family:var(--mono);font-size:.64rem;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-faint);margin-bottom:.7rem}
.cs-toc ol{list-style:none;counter-reset:toc;display:grid;grid-template-columns:repeat(2,1fr);gap:.5rem 1.6rem;padding:0}
.cs-toc li{counter-increment:toc;position:relative;padding-left:1.7rem}
.cs-toc li::before{content:counter(toc);position:absolute;left:0;top:.1rem;font-family:var(--mono);font-size:.68rem;color:var(--accent);font-weight:500}
.cs-toc a{font-size:.92rem;color:var(--ink);border-bottom:1px solid transparent;transition:color .15s ease,border-color .15s ease}
.cs-toc a:hover{color:var(--accent);border-bottom-color:var(--accent-hair)}
@media (max-width:640px){.cs-toc ol{grid-template-columns:1fr}}

.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}

/* ---- noscript fallback list ---- */
.cs-noscript-list{list-style:none;display:grid;gap:.4rem;padding-left:0}
.cs-noscript-list a{color:var(--accent);border-bottom:1px solid var(--accent-hair)}

@media (max-width:620px){
  .cs-stat-row{gap:1.1rem}
  .cs-stat .n{font-size:1.4rem}
}