/* ============================================================
   Kent Weather — shared design system
   Used by index.html and history.html.
   Page-specific tuning (body gradients, skyscape image/height/wash,
   and each page's own components) lives in that page's <style>.
   ============================================================ */

:root{
  /* ---- light (default) ---- */
  --paper:#f7f4ed;
  --paper-rgb:247,244,237;
  --paper-2:#fffdf8;
  --ink:#26312e;
  --ink-soft:#5a655f;
  --ink-faint:#69726b;
  --line:#e4ddd0;
  --line-soft:#efe9dd;
  --sky:#3f7cac;
  --sky-deep:#2c5d85;
  --sky-soft:#dceaf3;
  --sun:#e0892b;
  --sun-soft:#f6e4c8;
  --leaf:#5b8c5a;
  --rain:#4a7ba6;
  --rose:#b4654a;
  --glow-sky:rgba(220,234,243,1);
  --glow-sun:rgba(246,228,200,1);
  --pill-bg:#eaf2e8; --pill-line:#d6e6d4; --pill-ink:#4a7a49;
  --badge-bg:var(--sun-soft); --badge-line:#ecd3a8; --badge-ink:#9a5e16;
  --topbar:rgba(247,244,237,.82);
  --band:#edf1ef;
  --shadow:0 1px 2px rgba(38,49,46,.04), 0 8px 24px rgba(38,49,46,.06);
  --shadow-lift:0 2px 6px rgba(38,49,46,.06), 0 16px 36px rgba(38,49,46,.13);
  --radius:16px;
}
[data-theme="dark"]{
  --paper:#13181a;
  --paper-rgb:19,24,26;
  --paper-2:#1b2123;
  --ink:#e9e7df;
  --ink-soft:#a4ada7;
  --ink-faint:#889189;
  --line:#2a3134;
  --line-soft:#222829;
  --sky:#6ba6d4;
  --sky-deep:#8cc1e8;
  --sky-soft:#1d2a33;
  --sun:#f0a850;
  --sun-soft:#33291a;
  --leaf:#82b87f;
  --rain:#6ba6d4;
  --rose:#d98a6f;
  --glow-sky:rgba(34,52,66,.7);
  --glow-sun:rgba(58,46,28,.6);
  --pill-bg:#1c2a1c; --pill-line:#2c4029; --pill-ink:#82b87f;
  --badge-bg:#33291a; --badge-line:#4a3a22; --badge-ink:#f0a850;
  --topbar:rgba(19,24,26,.82);
  --band:#181f21;
  --shadow:0 1px 2px rgba(0,0,0,.2), 0 10px 30px rgba(0,0,0,.35);
  --shadow-lift:0 2px 6px rgba(0,0,0,.28), 0 18px 44px rgba(0,0,0,.5);
}

/* ---------- reset + base ---------- */
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:80px}
body{font-family:'Inter',system-ui,sans-serif;color:var(--ink);line-height:1.55;
  -webkit-font-smoothing:antialiased;transition:background-color .3s,color .3s}
.wrap{max-width:1080px;margin:0 auto;padding:0 24px}
a{color:inherit}
h1,h2,h3{font-family:'Fraunces',Georgia,serif;font-weight:500;letter-spacing:-.01em;line-height:1.1}
.mono{font-family:'IBM Plex Mono',monospace}
/* visible keyboard focus (mouse clicks don't trigger :focus-visible) */
:focus-visible{outline:2px solid var(--sky-deep);outline-offset:2px}
a:focus-visible{outline-offset:3px}
/* screen-reader-only + skip link */
.vh{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.skip{position:absolute;left:8px;top:-48px;z-index:100;background:var(--paper-2);color:var(--ink);
  border:1px solid var(--line);border-radius:9px;padding:9px 14px;font-weight:600;font-size:14px;
  text-decoration:none;box-shadow:var(--shadow);transition:top .15s}
.skip:focus{top:8px}
.card{background:var(--paper-2);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);
  transition:background-color .3s,border-color .3s,transform .2s ease,box-shadow .2s ease}
.band{background:var(--band);border-top:1px solid var(--line-soft);border-bottom:1px solid var(--line-soft);
  transition:background-color .3s,border-color .3s}
.kicker{font-size:12px;text-transform:uppercase;letter-spacing:.14em;color:var(--sun);font-weight:600;margin-bottom:6px}

/* ---------- skyscape (shared parts; height/photo/wash set per page) ---------- */
.skyscape{position:absolute;top:0;left:0;width:100%;z-index:-1;overflow:hidden;pointer-events:none}
.skyscape>div{position:absolute;inset:0}
.skyscape .nighttint{opacity:0;transition:opacity .45s}
.skyscape .stars,.skyscape .aurora{opacity:0;transition:opacity .7s}
[data-theme="dark"] .skyscape .nighttint{opacity:1;
  background:linear-gradient(to bottom,rgba(14,22,46,.75) 0%,rgba(var(--paper-rgb),0) 72%);mix-blend-mode:multiply}
[data-theme="dark"] .skyscape .stars,[data-theme="dark"] .skyscape .aurora{opacity:1}
.stars i{position:absolute;border-radius:50%;background:#fff;animation:tw 4s infinite ease-in-out}
@keyframes tw{0%,100%{opacity:.08}50%{opacity:.7}}
.aurora b{position:absolute;border-radius:50%;filter:blur(64px);mix-blend-mode:screen;display:block}
.aurora .a1{width:540px;height:300px;left:-70px;top:-50px;
  background:radial-gradient(circle,rgba(94,200,160,.32),transparent 70%);animation:drift 19s ease-in-out infinite}
.aurora .a2{width:500px;height:280px;right:-50px;top:-70px;
  background:radial-gradient(circle,rgba(118,150,232,.3),transparent 70%);animation:drift 24s ease-in-out infinite reverse}
@keyframes drift{0%,100%{transform:translate(0,0) scale(1)}50%{transform:translate(46px,32px) scale(1.16)}}

/* ---------- top bar ---------- */
header.top{position:sticky;top:0;z-index:50;backdrop-filter:blur(10px);background:var(--topbar);
  border-bottom:1px solid var(--line);transition:background-color .3s,border-color .3s}
.top .wrap{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:12px;font-family:'Fraunces',serif;font-size:19px;font-weight:600;text-decoration:none;color:inherit}
.brand .mark,.foot-brand .mark{width:36px;height:36px;display:grid;place-items:center;flex:none}
.brand .mark svg,.foot-brand .mark svg{width:100%;height:100%;display:block}
nav.menu{display:flex;gap:26px;font-size:14.5px;font-weight:500;color:var(--ink-soft)}
nav.menu a{text-decoration:none;transition:color .15s;position:relative}
nav.menu a::after{content:"";position:absolute;left:0;right:0;bottom:-6px;height:2px;border-radius:2px;
  background:var(--sky-deep);transform:scaleX(0);transform-origin:center;transition:transform .22s ease}
nav.menu a:hover::after,nav.menu a.active::after{transform:scaleX(1)}
nav.menu a:hover,nav.menu a.active{color:var(--sky-deep)}
.right{display:flex;align-items:center;gap:14px}

/* icon buttons (theme toggle, hamburger, day/year steppers) */
.ttoggle,.navbtn,.iconbtn{width:36px;height:36px;border-radius:9px;border:1px solid var(--line);background:var(--paper-2);
  display:grid;place-items:center;cursor:pointer;color:var(--ink-soft);transition:.2s}
.ttoggle svg,.navbtn svg,.iconbtn svg{display:block}
.ttoggle:hover,.navbtn:hover,.iconbtn:hover{color:var(--ink);border-color:var(--ink-faint)}
.unitbtn{height:36px;width:62px;padding:0;border-radius:9px;border:1px solid var(--line);background:var(--paper-2);
  font-family:'Inter',sans-serif;font-weight:600;font-size:13px;cursor:pointer;transition:border-color .2s;
  display:inline-flex;align-items:center;justify-content:center;gap:2px}
.unitbtn:hover{border-color:var(--ink-faint)}
.unitbtn span{color:var(--ink-faint);transition:color .15s}
.unitbtn .sep{font-weight:400}
.unitbtn.metric .um,.unitbtn.us .uf{color:var(--ink)}
.iconbtn:disabled{opacity:.38;cursor:default;pointer-events:none}
.ttoggle .moon{display:none}
[data-theme="dark"] .ttoggle .sun{display:none}
[data-theme="dark"] .ttoggle .moon{display:block}
.navbtn{display:none}

/* ---------- mobile menu ---------- */
@media(max-width:760px){
  nav.menu{display:none}
  .navbtn{display:grid}
  nav.menu.open{display:flex;flex-direction:column;position:absolute;top:64px;left:0;right:0;z-index:60;
    background:var(--paper);border-bottom:1px solid var(--line);
    padding:6px 24px 12px;gap:0;box-shadow:0 14px 30px rgba(0,0,0,.16)}
  nav.menu.open a{padding:13px 2px;border-bottom:1px solid var(--line-soft);font-size:16px}
  nav.menu.open a:last-child{border-bottom:0}
}

/* ---------- footer ---------- */
footer{margin-top:30px;border-top:1px solid var(--line);background:var(--topbar)}
footer .wrap{padding:42px 24px 0}
.foot-grid{display:grid;grid-template-columns:1.6fr 1fr 1.3fr;gap:36px}
@media(max-width:760px){.foot-grid{grid-template-columns:1fr;gap:30px}}
.foot-brand{display:flex;align-items:center;gap:11px;font-family:'Fraunces',serif;font-size:18px;font-weight:600;margin-bottom:13px}
.foot-tag{font-family:'Fraunces',serif;font-style:italic;color:var(--ink-soft);font-size:15px;max-width:34ch;line-height:1.55}
.foot-h{font-size:12px;text-transform:uppercase;letter-spacing:.1em;color:var(--ink-faint);font-weight:600;margin-bottom:14px}
.foot-links{display:flex;flex-direction:column;gap:10px}
.foot-links a{text-decoration:none;color:var(--ink-soft);font-size:14px;width:fit-content;transition:color .15s}
.foot-links a:hover{color:var(--sky-deep)}
.foot-station{font-size:13.5px;color:var(--ink-soft);line-height:2.05}
.foot-station .k{display:inline-block;width:104px;color:var(--ink-faint)}
.foot-bar{margin-top:36px;border-top:1px solid var(--line-soft);padding:16px 0 24px;display:flex;flex-wrap:wrap;
  justify-content:space-between;align-items:center;gap:10px;font-size:12.5px;color:var(--ink-faint)}
.badge{display:inline-block;background:var(--badge-bg);color:var(--badge-ink);border:1px solid var(--badge-line);
  padding:3px 10px;border-radius:99px;font-size:11.5px;font-weight:600}

/* ---------- motion ---------- */
.reveal{opacity:0;transform:translateY(16px);transition:opacity .55s ease,transform .55s ease}
.reveal.in{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){
  .stars i,.aurora b{animation:none}
  .reveal{opacity:1;transform:none;transition:none}
}