/* world4.traversia.org — styles. Matches traversia.org brand:
   Playfair Display headings, Source Sans 3 body, warm parchment palette. */

:root{
  --charcoal:#2d2a26;
  --cream:#faf8f5;
  --sand:#f4ece4;
  --sand-dark:#e8ddd2;
  --gold:#c9a227;
  --olive:#5a6f52;
  --terracotta:#c25a3c;
  --terracotta-light:#e07a5f;
  --ink-60:rgba(45,42,38,.6);
  --ink-40:rgba(45,42,38,.4);
  --ink-12:rgba(45,42,38,.12);
  --ink-06:rgba(45,42,38,.06);
  --maxw:1080px;
  --serif:"Playfair Display",Georgia,serif;
  --sans:"Source Sans 3","Source Sans Pro",system-ui,sans-serif;
  /* scenario / series colours — categorical, maximally distinct on cream */
  --c-pop:#2b6cb0;   /* blue */
  --c-io:#2e9e4f;    /* green */
  --c-food:#e0a200;  /* gold */
  --c-poll:#cb3f2e;  /* red */
  --c-res:#7b4ea3;   /* purple */
  --c-hwi:#17a2b8;   /* teal/cyan */
  --c-hef:#8a5a2b;   /* brown */
  --c-land:#b9588f;  /* mauve/rose */
  --c-ewaste:#6b6f76;/* grey */
}
.w4-mult{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
@media(max-width:680px){.w4-mult{grid-template-columns:1fr}}
.smchart h4{margin:0 0 4px;font-size:.95rem}
.smchart{background:var(--sand);border-radius:10px;padding:10px 12px}
.w4-empty{padding:40px 16px;text-align:center;color:var(--ink-60);background:var(--sand);border-radius:10px}
.cards2{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin-top:18px}
@media(max-width:760px){.cards2{grid-template-columns:1fr}}
.dcard{background:#fff;border:1px solid var(--ink-12);border-radius:12px;padding:16px 18px}
.dcard .dh{display:flex;align-items:center;gap:8px;margin-bottom:4px}
.dcard .dh .sw{width:13px;height:13px;border-radius:3px;display:inline-block;flex:0 0 auto}
.dcard h4{margin:0;font-size:1.05rem}
.dcard dt{font-weight:700;color:var(--ink-60);margin-top:10px;font-size:.72rem;text-transform:uppercase;letter-spacing:.05em}
.dcard dd{margin:2px 0 0;font-size:.93rem}
.maptable{width:100%;border-collapse:collapse;margin-top:14px;font-size:.93rem}
.maptable th,.maptable td{text-align:left;padding:9px 10px;border-bottom:1px solid var(--ink-12);vertical-align:top}
.maptable th{font-size:.74rem;text-transform:uppercase;letter-spacing:.05em;color:var(--ink-60)}
.maptable td:first-child{font-weight:600;white-space:nowrap}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--cream);color:var(--charcoal);
  font-family:var(--sans);font-size:17px;line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{font-family:var(--serif);font-weight:700;line-height:1.15;margin:0 0 .4em}
h1{font-size:clamp(2.4rem,6vw,4.6rem)}
h2{font-size:clamp(1.8rem,3.6vw,2.7rem)}
h3{font-size:1.4rem}
h4{font-size:1.1rem;font-family:var(--sans);font-weight:600;letter-spacing:.01em}
p{margin:0 0 1em}
a{color:var(--terracotta);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.muted{color:var(--ink-60)}
.small{font-size:.85rem}
.center{text-align:center}

/* ---------- top nav ---------- */
header.nav{
  position:sticky;top:0;z-index:50;
  background:rgba(250,248,245,.9);backdrop-filter:blur(8px);
  border-bottom:1px solid var(--ink-12);
}
.nav .wrap{display:flex;align-items:center;gap:18px;height:62px}
.brand{font-family:var(--serif);font-weight:700;font-size:1.3rem;color:var(--charcoal)}
.brand:hover{text-decoration:none}
.brand .dim{color:var(--ink-40);font-weight:400}
.nav nav{display:flex;gap:18px;margin-left:auto;align-items:center}
.nav nav a{color:var(--charcoal);font-size:.95rem;font-weight:600}
.nav nav a:hover{color:var(--terracotta);text-decoration:none}
.langtoggle{display:flex;border:1px solid var(--ink-12);border-radius:8px;overflow:hidden}
.langtoggle button{
  border:0;background:transparent;color:var(--ink-60);
  font-family:var(--sans);font-size:.8rem;font-weight:600;
  padding:5px 9px;cursor:pointer
}
.langtoggle button.on{background:var(--charcoal);color:var(--cream)}
@media(max-width:760px){.nav nav a.navlink{display:none}}

/* ---------- hero ---------- */
.hero{padding:72px 0 40px;border-bottom:1px solid var(--ink-12)}
.hero .eyebrow{
  text-transform:uppercase;letter-spacing:.18em;font-size:.78rem;
  font-weight:700;color:var(--terracotta);margin-bottom:18px
}
.hero h1{max-width:14ch}
.hero .lede{font-size:1.25rem;max-width:60ch;color:var(--charcoal);margin-top:.6em}
.herochart{margin-top:30px;background:#fff;border:1px solid var(--ink-12);border-radius:14px;padding:18px 20px}
.cta-row{display:flex;gap:14px;flex-wrap:wrap;margin-top:26px}
.btn{
  display:inline-block;padding:12px 22px;border-radius:10px;
  font-weight:600;font-size:1rem;cursor:pointer;border:1px solid transparent
}
.btn-primary{background:var(--terracotta);color:#fff}
.btn-primary:hover{background:var(--terracotta-light);text-decoration:none}
.btn-ghost{background:transparent;border-color:var(--ink-12);color:var(--charcoal)}
.btn-ghost:hover{border-color:var(--charcoal);text-decoration:none}

/* ---------- sections ---------- */
section.block{padding:64px 0;border-bottom:1px solid var(--ink-12)}
.sec-eyebrow{text-transform:uppercase;letter-spacing:.16em;font-size:.76rem;font-weight:700;color:var(--olive);margin-bottom:10px}
.lead{font-size:1.18rem;max-width:62ch;color:var(--charcoal)}

/* three movement cards on home */
.cards3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:34px}
@media(max-width:820px){.cards3{grid-template-columns:1fr}}
.card{
  background:#fff;border:1px solid var(--ink-12);border-radius:14px;padding:24px;
  transition:border-color .15s, transform .15s
}
.card:hover{border-color:var(--terracotta);transform:translateY(-2px)}
.card .n{font-family:var(--serif);font-size:2.2rem;color:var(--sand-dark)}
.card h3{margin-top:6px}
.card a{font-weight:600}

/* timeline */
.timeline{margin-top:30px;display:grid;gap:0}
.tl-item{display:grid;grid-template-columns:96px 1fr;gap:18px;padding:16px 0;border-top:1px solid var(--ink-12)}
.tl-item .yr{font-family:var(--serif);font-size:1.5rem;color:var(--terracotta)}
.tl-item h4{margin-bottom:.2em}

/* sector grid */
.sectors{display:grid;grid-template-columns:repeat(5,1fr);gap:12px;margin-top:28px}
@media(max-width:820px){.sectors{grid-template-columns:repeat(2,1fr)}}
.sector{background:var(--sand);border-radius:12px;padding:16px;border:1px solid transparent}
.sector h4{margin-bottom:.3em}
.sector .icon{font-size:1.4rem}

/* diagrams */
.diagram-wrap{background:#fff;border:1px solid var(--ink-12);border-radius:14px;padding:22px;margin-top:26px}
.loop-controls{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:14px}
.chip{
  border:1px solid var(--ink-12);background:#fff;border-radius:20px;padding:6px 14px;
  font-size:.9rem;font-weight:600;cursor:pointer;color:var(--charcoal)
}
.chip:hover{border-color:var(--charcoal)}
.chip.on{background:var(--charcoal);color:var(--cream);border-color:var(--charcoal)}

/* ---------- simulator ---------- */
.sim-grid{display:grid;grid-template-columns:1.7fr 1fr;gap:20px;align-items:start;margin-top:26px}
@media(max-width:900px){.sim-grid{grid-template-columns:1fr}}
.panel{background:#fff;border:1px solid var(--ink-12);border-radius:14px;padding:18px 20px}
.panel h4{margin-bottom:12px}
.controls .ctrl{margin-bottom:16px}
.controls label{display:flex;justify-content:space-between;font-size:.9rem;font-weight:600;margin-bottom:4px}
.controls label .val{color:var(--terracotta);font-variant-numeric:tabular-nums}
input[type=range]{width:100%;accent-color:var(--terracotta)}
.selectrow{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:14px}
.seg{display:flex;border:1px solid var(--ink-12);border-radius:10px;overflow:hidden;flex-wrap:wrap}
.seg button{border:0;background:#fff;padding:8px 14px;font-family:var(--sans);font-weight:600;font-size:.9rem;cursor:pointer;color:var(--charcoal);border-right:1px solid var(--ink-12)}
.seg button:last-child{border-right:0}
.seg button.on{background:var(--olive);color:#fff}
.chartbox{width:100%;min-height:340px}
.legend{display:flex;flex-wrap:wrap;gap:14px;margin-top:10px;font-size:.82rem}
.legend .k{display:inline-flex;align-items:center;gap:6px}
.legend .sw{width:16px;height:3px;border-radius:2px;display:inline-block}
.checks{display:flex;flex-wrap:wrap;gap:10px 16px;margin-top:6px}
.checks label{font-size:.85rem;font-weight:600;display:inline-flex;gap:6px;align-items:center;cursor:pointer}
.note{background:var(--sand);border-left:3px solid var(--gold);border-radius:0 8px 8px 0;padding:12px 16px;font-size:.92rem;margin-top:16px}
.toggle-row{display:flex;align-items:center;gap:12px;margin:8px 0 4px}
.switch{position:relative;width:46px;height:26px;flex:0 0 auto}
.switch input{opacity:0;width:0;height:0}
.slider-sw{position:absolute;inset:0;background:var(--ink-12);border-radius:26px;transition:.2s;cursor:pointer}
.slider-sw:before{content:"";position:absolute;width:20px;height:20px;left:3px;top:3px;background:#fff;border-radius:50%;transition:.2s}
.switch input:checked + .slider-sw{background:var(--terracotta)}
.switch input:checked + .slider-sw:before{transform:translateX(20px)}

/* glossary tooltip */
.term{border-bottom:1px dotted var(--terracotta);cursor:help;position:relative;font-weight:600}
.tooltip-pop{
  position:fixed;z-index:200;max-width:280px;background:var(--charcoal);color:var(--cream);
  font-family:var(--sans);font-weight:400;font-size:.85rem;line-height:1.5;
  padding:9px 12px;border-radius:8px;box-shadow:0 6px 24px rgba(0,0,0,.22);
  pointer-events:none;opacity:0;transition:opacity .12s
}
.tooltip-pop.show{opacity:1}
.tooltip-pop .t{font-weight:600;display:block;margin-bottom:2px;color:#fff}

/* metric cards */
.metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:16px}
@media(max-width:700px){.metrics{grid-template-columns:repeat(2,1fr)}}
.metric{background:var(--sand);border-radius:10px;padding:12px 14px}
.metric .lab{font-size:.74rem;text-transform:uppercase;letter-spacing:.08em;color:var(--ink-60);font-weight:700}
.metric .num{font-family:var(--serif);font-size:1.7rem;line-height:1.1;margin-top:2px}
.metric .sub{font-size:.78rem;color:var(--ink-60)}

/* footer / sources */
footer{padding:54px 0;background:var(--sand)}
footer h3{margin-bottom:14px}
.refs{font-size:.92rem;line-height:1.7}
.refs li{margin-bottom:8px}
.tag{display:inline-block;background:var(--sand-dark);border-radius:6px;padding:1px 8px;font-size:.72rem;font-weight:700;color:var(--charcoal);margin-right:6px}

/* d3 axis styling */
.axis path,.axis line{stroke:var(--ink-12)}
.axis text{fill:var(--ink-60);font-size:11px;font-family:var(--sans)}
.gridline line{stroke:var(--ink-06)}
.series-line{fill:none;stroke-width:2.2}
.today-line{stroke:var(--ink-40);stroke-dasharray:4 4}
.today-label{fill:var(--ink-60);font-size:11px}
.data-dot{stroke:#fff;stroke-width:1}
.hover-tip{font-size:12px}
.reveal{opacity:0;transform:translateY(14px);transition:opacity .6s, transform .6s}
.reveal.in{opacity:1;transform:none}