:root{
  --ink:#102235; --muted:#687787; --line:#d9e1e8; --paper:#f4f7f9; --white:#fff;
  --blue:#2474a8; --navy:#0b1f33; --gold:#f4be4f;
  --week1:#c0562f; --week1-soft:#f7e3d8;
  --week2:#2c6e8f; --week2-soft:#dcebf2;
  --fall:#8f9ee8; --catch:#5fb87a; --up:#e0724f; --down:#d7c23a; --follow:#e0a63d; --hold:#5aa9cf;
}
*{box-sizing:border-box}
html{font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ink);background:var(--paper);scroll-behavior:smooth}
body{margin:0;min-width:320px}
a{color:var(--blue)}
var{font-style:normal}

.topbar{min-height:72px;background:var(--navy);color:#fff;display:flex;align-items:center;justify-content:space-between;gap:10px;padding:10px clamp(16px,4vw,64px);position:sticky;top:0;z-index:5;box-shadow:0 8px 30px #06152425;flex-wrap:wrap}
.brand{color:#fff;text-decoration:none;display:flex;align-items:center;gap:14px;font-weight:650;letter-spacing:-.01em}
.mark{width:42px;height:42px;border-radius:50%;background:var(--gold);color:var(--navy);display:grid;place-items:center;font-weight:800;font-size:.8rem;flex:none}
.brand-text{white-space:nowrap}
.topbar nav{display:flex;gap:3px;flex-wrap:wrap;overflow-x:auto;-webkit-overflow-scrolling:touch}
.topbar button{border:0;background:transparent;color:#aebdca;font:inherit;font-size:.92rem;padding:10px 14px;border-radius:7px;cursor:pointer;white-space:nowrap;flex:none}
.topbar button:hover{background:#ffffff12;color:#fff}
.topbar button.active{background:#ffffff1c;color:#fff}
@media (max-width:560px){
  .topbar{justify-content:flex-start}
  .brand-text{font-size:.92rem}
  .topbar nav{width:100%;justify-content:space-between}
  .topbar button{padding:8px 8px;font-size:.8rem}
}

main{max-width:1440px;margin:auto;padding:34px clamp(18px,4vw,56px) 90px}
.view{display:none}
.view.active{display:block}

.section-intro{max-width:900px;margin-bottom:26px}
.eyebrow{text-transform:uppercase;letter-spacing:.16em;font-size:.74rem;font-weight:800;color:var(--blue);margin:0 0 8px}
h1{font-family:Georgia,'Times New Roman',serif;font-weight:500;font-size:clamp(1.8rem,3.6vw,3.1rem);line-height:1.08;letter-spacing:-.03em;margin:0}
h2{font-size:1.05rem;margin:0}
.lede{color:var(--muted);font-size:1rem;line-height:1.6;margin:12px 0 0;max-width:760px}
.note{color:var(--muted);font-size:.82rem;line-height:1.5;margin:10px 0 0}

/* ---- cards / panels ---- */
.panel{background:var(--white);border:1px solid var(--line);border-radius:14px;padding:20px 22px;box-shadow:0 1px 2px #10223508}
.panel p{color:var(--muted);font-size:.92rem;line-height:1.6;margin:10px 0}
.panel-title{display:flex;justify-content:space-between;align-items:flex-start;gap:14px;margin-bottom:6px}
.panel-title span{display:block;font-size:.72rem;font-weight:800;color:var(--blue);letter-spacing:.08em;margin-bottom:2px}
.panel-title p{margin:2px 0 0;color:var(--muted);font-size:.82rem}
.span2{grid-column:span 2}

.split-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;margin-top:6px}
.method-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-bottom:18px}
.method-grid article{background:var(--white);border:1px solid var(--line);border-radius:14px;padding:18px 20px}
.method-grid span{display:block;font-size:.72rem;font-weight:800;color:var(--blue);letter-spacing:.08em;margin-bottom:6px}
.method-grid h2{font-size:1rem;margin:0 0 6px}
.method-grid p{color:var(--muted);font-size:.88rem;line-height:1.55;margin:0}
@media (max-width:920px){.split-grid,.method-grid{grid-template-columns:1fr}}
.method-grid-2{grid-template-columns:repeat(2,1fr)}
.panel h3{font-size:.86rem;font-weight:800;letter-spacing:.02em;color:var(--ink);margin:22px 0 6px;padding-top:14px;border-top:1px solid var(--line)}
.panel h3:first-of-type{border-top:0;padding-top:0;margin-top:14px}

/* ---- equations ---- */
.eq-block{background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:16px 20px;margin:12px 0;overflow-x:auto}
.eq-row{display:flex;align-items:center;gap:10px;flex-wrap:nowrap;white-space:nowrap;font-family:Georgia,'Times New Roman',serif;font-style:italic;font-size:1rem;color:var(--ink)}
.eq-row var,.eq-row sub,.eq-row sup{font-style:italic}
.eq-list .eq-row + .eq-row{margin-top:12px}
.eq-tag{margin-left:auto;padding-left:16px;font-style:normal;font-family:Inter,ui-sans-serif,system-ui,sans-serif;color:var(--muted);font-size:.8rem;flex:none}
.frac{display:inline-flex;flex-direction:column;align-items:center;vertical-align:middle;line-height:1.25;margin:0 2px}
.frac .num{padding:0 3px 3px;border-bottom:1.3px solid var(--ink)}
.frac .den{padding:3px 3px 0}
.frac.eq-inline{font-size:.88em;margin:0 3px}
.eq-int{font-size:1.35em;font-style:normal;padding:0 1px;vertical-align:-.08em}

/* ---- concept flow diagram ---- */
.flow-diagram{display:flex;align-items:stretch;gap:8px;flex-wrap:nowrap;margin:14px 0 6px}
.flow-step{flex:1 1 0;min-width:0;background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:12px 13px;display:flex;flex-direction:column;gap:5px}
.flow-step.accent{background:#eaf3f8;border-color:var(--blue)}
.flow-label{font-size:.76rem;font-weight:800;color:var(--ink)}
.flow-step p{margin:0;color:var(--muted);font-size:.78rem;line-height:1.45}
.flow-arrow{display:flex;align-items:center;justify-content:center;color:var(--muted);font-size:1.1rem;flex:0 0 auto;padding:0}
@media (max-width:900px){
  .flow-diagram{flex-direction:column}
  .flow-arrow{transform:rotate(90deg);padding:2px 0;align-self:center}
}

/* ---- tables ---- */
.table-wrap{overflow-x:auto}
.data-table{border-collapse:collapse;width:100%;font-size:.9rem;margin-top:8px}
.data-table th,.data-table td{text-align:left;padding:8px 14px 8px 0;border-bottom:1px solid var(--line)}
.data-table th{color:var(--muted);font-weight:700;font-size:.78rem;text-transform:uppercase;letter-spacing:.05em}

/* ---- pattern legend chips ---- */
.pattern-chip-row{display:flex;flex-wrap:wrap;gap:8px;margin:14px 0}
.pattern-chip{display:flex;align-items:center;gap:7px;background:var(--paper);border:1px solid var(--line);border-radius:20px;padding:5px 12px 5px 8px;font-size:.82rem;font-weight:600}
.pattern-chip i{width:11px;height:11px;border-radius:50%;display:inline-block}

/* ---- metric cards ---- */
.metric-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;margin:18px 0 26px}
.metric{background:var(--white);border:1px solid var(--line);border-radius:12px;padding:14px 16px}
.metric small{display:block;color:var(--muted);font-size:.72rem;text-transform:uppercase;letter-spacing:.06em;font-weight:700;margin-bottom:6px}
.metric strong{font-size:1.5rem;font-weight:700;letter-spacing:-.02em}
.metric em{display:block;font-style:normal;color:var(--week2);font-size:.82rem;margin-top:4px;font-weight:600}
.metric em.b-week1{color:var(--week1)}

/* ---- selector strip ---- */
.selector-strip{display:flex;flex-direction:column;gap:10px;margin-bottom:10px}
.selector-row{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.selector-row .row-label{font-size:.72rem;font-weight:800;text-transform:uppercase;letter-spacing:.07em;color:var(--muted);width:78px;flex:none}
.day-card{border:1.5px solid var(--line);background:var(--white);border-radius:11px;padding:8px 12px;cursor:pointer;font:inherit;text-align:left;min-width:84px}
.day-card .d-date{display:block;font-weight:700;font-size:.86rem}
.day-card .d-sub{display:block;color:var(--muted);font-size:.72rem;margin-top:1px}
.day-card.w1{border-left:4px solid var(--week1)}
.day-card.w2{border-left:4px solid var(--week2)}
.day-card.holiday .d-sub{color:var(--week1);font-weight:700}
.day-card.sel-a{background:var(--ink);border-color:var(--ink);color:#fff}
.day-card.sel-a .d-sub{color:#ffffffb0}
.day-card.sel-b{outline:2.5px solid var(--ink);outline-offset:2px}
.day-card:hover{border-color:var(--blue)}

.selection-summary{color:var(--muted);font-size:.84rem;margin:2px 0 18px}
.selection-summary b{color:var(--ink)}
.selection-summary .dot-a{color:var(--ink);font-weight:800}
.selection-summary .dot-b{color:var(--blue);font-weight:800}

/* ---- analysis grid / charts ---- */
.analysis-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
@media (max-width:1000px){.analysis-grid{grid-template-columns:1fr}.span2{grid-column:span 1}}
.chart{margin-top:10px}
.chart svg{width:100%;height:auto;display:block;overflow:visible;font-family:inherit}
.chart-wide{min-height:280px}
.grid{stroke:var(--line);stroke-width:1}
.muted{fill:var(--muted)}
.axis-label{fill:var(--muted);font-size:11px}
.value-label{fill:var(--ink);font-size:10.5px;font-weight:600}

.panel-toggle{display:flex;gap:2px;background:var(--paper);border:1px solid var(--line);border-radius:9px;padding:2px;flex:none}
.panel-toggle button{border:0;background:transparent;font:inherit;font-size:.78rem;font-weight:700;padding:5px 11px;border-radius:7px;cursor:pointer;color:var(--muted)}
.panel-toggle button.active{background:var(--white);color:var(--ink);box-shadow:0 1px 3px #10223522}

.legend{display:flex;flex-wrap:wrap;gap:10px 16px;margin-top:10px;font-size:.78rem}
.legend span{display:flex;align-items:center;gap:6px;color:var(--muted)}
.legend i{width:10px;height:10px;border-radius:3px;display:inline-block}
.legend i.mk-circle{border-radius:50%}
.legend i.mk-star{border-radius:0;clip-path:polygon(50% 0%,63% 35%,100% 38%,72% 60%,82% 96%,50% 76%,18% 96%,28% 60%,0% 38%,37% 35%)}

/* ---- results: duration trends small multiples ---- */
.duration-trends-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:6px 10px;margin-top:10px}
.duration-trends-grid .mini-chart{background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:4px}
.duration-trends-grid .mini-chart svg{width:100%;height:auto;display:block;overflow:visible;font-family:inherit}
.duration-trends-legend{grid-column:1/-1;justify-content:center;margin-top:2px}
@media (max-width:760px){.duration-trends-grid{grid-template-columns:1fr 1fr}}
@media (max-width:480px){.duration-trends-grid{grid-template-columns:1fr}}

.pagefoot{text-align:center;color:var(--muted);font-size:.8rem;padding:24px 0 40px}

/* ---- results: gif overview grid ---- */
.gif-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:14px}
.gif-grid figure{margin:0;border:1px solid var(--line);border-radius:10px;overflow:hidden;background:var(--paper)}
.gif-grid figcaption{padding:8px 12px;font-size:.78rem;font-weight:700;color:var(--ink);border-bottom:1px solid var(--line)}
.gif-grid img{display:block;width:100%;height:auto}
@media (max-width:800px){.gif-grid{grid-template-columns:1fr}}

/* ---- results: subsection headers ---- */
.subsection-intro{max-width:900px;margin:40px 0 18px}
.subsection-intro h2{font-family:Georgia,'Times New Roman',serif;font-weight:500;font-size:1.5rem;letter-spacing:-.01em;margin:0 0 8px;color:var(--ink)}
.subsection-intro p{color:var(--muted);font-size:.94rem;line-height:1.6;margin:0;max-width:760px}

/* ---- callout ---- */
.callout{background:#eaf3f8;border:1px solid var(--blue);border-left-width:4px;border-radius:8px;padding:14px 18px;margin-top:14px;font-size:.92rem;line-height:1.6;color:var(--ink)}
.callout strong{color:var(--blue)}

/* ---- findings bullet lists ---- */
.findings-list{margin:10px 0 0;padding-left:20px;color:var(--muted);font-size:.92rem;line-height:1.6}
.findings-list li{margin:0 0 10px}
.findings-list li:last-child{margin-bottom:0}
.findings-list li::marker{color:var(--blue)}

/* ---- results: across-week / day-breakdown toggle ---- */
.results-toggle{display:flex;gap:8px;margin-bottom:28px;flex-wrap:wrap}
.results-toggle button{border:1.5px solid var(--line);background:var(--white);font:inherit;font-size:.92rem;font-weight:700;padding:11px 20px;border-radius:11px;cursor:pointer;color:var(--muted)}
.results-toggle button:hover{border-color:var(--blue)}
.results-toggle button.active{background:var(--navy);border-color:var(--navy);color:#fff}
.results-view{display:none}
.results-view.active{display:block}

/* ---- results: daily static figures ---- */
.daily-figures{margin-top:10px}
.daily-figure-row{display:flex;gap:16px;flex-wrap:wrap}
.daily-figure-col{flex:1 1 380px;min-width:280px}
.daily-figure-label{font-size:.78rem;font-weight:800;color:var(--blue);letter-spacing:.03em;margin-bottom:8px}
.daily-figure-col img{display:block;width:100%;height:auto;border:1px solid var(--line);border-radius:10px;margin-bottom:12px}