/*
  Chasing the Northern Lights — portfolio project styles
  Every rule is scoped under .ctnl so nothing leaks into the host portfolio.
  Tokens (colours, fonts) live on .ctnl; dark theme follows prefers-color-scheme
  and an explicit data-theme="dark" | "light" on the <html> element, exactly as the original.
*/

/* ---------- fonts (self-hosted, SIL OFL 1.1) ---------- */
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  font-display: swap;
  font-weight: 500;
  src: url(../assets/fonts/ibm-plex-mono-cyrillic-ext-500-normal.woff2) format('woff2');
  unicode-range: U+0460-052F,U+1C80-1C8A,U+20B4,U+2DE0-2DFF,U+A640-A69F,U+FE2E-FE2F;
}
@font-face {
  font-family: 'CTNL IBM Plex Mono';
  font-style: normal;
  font-display: swap;
  font-weight: 500;
  src: url(../assets/fonts/ibm-plex-mono-cyrillic-500-normal.woff2) format('woff2');
  unicode-range: U+0301,U+0400-045F,U+0490-0491,U+04B0-04B1,U+2116;
}
@font-face {
  font-family: 'CTNL IBM Plex Mono';
  font-style: normal;
  font-display: swap;
  font-weight: 500;
  src: url(../assets/fonts/ibm-plex-mono-vietnamese-500-normal.woff2) format('woff2');
  unicode-range: U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB;
}
@font-face {
  font-family: 'CTNL IBM Plex Mono';
  font-style: normal;
  font-display: swap;
  font-weight: 500;
  src: url(../assets/fonts/ibm-plex-mono-latin-ext-500-normal.woff2) format('woff2');
  unicode-range: U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF;
}
@font-face {
  font-family: 'CTNL IBM Plex Mono';
  font-style: normal;
  font-display: swap;
  font-weight: 500;
  src: url(../assets/fonts/ibm-plex-mono-latin-500-normal.woff2) format('woff2');
  unicode-range: U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;
}

/* ---- carried over from the original page shell (scoped) ---- */
.ctnl [hidden]{display:none!important}
.ctnl{display:block;margin:0}


.ctnl{
  --ground:#f1f3f4; --surface:#e3e8ea; --ink:#15191b; --muted:#56626a; --line:#c9d1d5;
  --ice:#6f8f9e; --accent:#2f7d5c; --accent-soft:rgba(47,125,92,.12);
  --display:"CTNL Bodoni Moda","Didot","Bodoni 72",Georgia,serif;
  --body:"CTNL Hanken Grotesk","Helvetica Neue",Arial,sans-serif;
  --mono:"CTNL IBM Plex Mono",ui-monospace,"SFMono-Regular",Menlo,monospace;
  --gutter:clamp(16px,4vw,56px); --measure:62ch;
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]) .ctnl{
    color-scheme:dark;
    --ground:#0e1113; --surface:#171c1f; --ink:#e6ecee; --muted:#93a1a8; --line:#2a3236;
    --ice:#9db7c3; --accent:#7fcfa4; --accent-soft:rgba(127,207,164,.12);
  }
}
:root[data-theme="dark"] .ctnl{
  color-scheme:dark;
  --ground:#0e1113; --surface:#171c1f; --ink:#e6ecee; --muted:#93a1a8; --line:#2a3236;
  --ice:#9db7c3; --accent:#7fcfa4; --accent-soft:rgba(127,207,164,.12);
}
.ctnl,.ctnl *{box-sizing:border-box}
.ctnl{background:var(--ground);color:var(--ink);font-family:var(--body);font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased}
.ctnl .wrap{padding-inline:var(--gutter);max-width:1480px;margin-inline:auto}
.ctnl img{display:block;max-width:100%;height:auto}
.ctnl a{color:inherit}
.ctnl :focus-visible{outline:2px solid var(--accent);outline-offset:3px}

/* ---------- masthead ---------- */
.ctnl .mast{padding-block:clamp(40px,7vw,96px) clamp(28px,4vw,48px);display:grid;grid-template-columns:minmax(0,1.5fr) minmax(0,1fr);gap:clamp(24px,5vw,72px);align-items:end}
.ctnl .eyebrow{font-family:var(--mono);font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin:0 0 20px}
.ctnl .eyebrow b{color:var(--accent);font-weight:500}
.ctnl h1{font-family:var(--display);font-weight:400;font-size:clamp(44px,8.2vw,124px);line-height:.92;letter-spacing:-.02em;margin:0;text-wrap:balance}
.ctnl .chapter{font-family:var(--display);font-style:italic;font-size:clamp(24px,3.2vw,44px);line-height:1.1;margin:18px 0 0;color:var(--ice)}
.ctnl .chapter span{font-style:normal;font-family:var(--mono);font-size:.34em;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);vertical-align:.5em;margin-right:.9em}
.ctnl .lede{font-size:clamp(17px,1.5vw,19px);max-width:40ch;margin:0;color:var(--ink)}
.ctnl .lede em{font-family:var(--display);font-size:1.12em}

.ctnl .hero{margin:0;position:relative}
.ctnl .hero img{width:100%;aspect-ratio:16/8;object-fit:cover;object-position:50% 55%}
.ctnl .hero figcaption{position:absolute;right:var(--gutter);bottom:14px;font-family:var(--mono);font-size:11px;letter-spacing:.08em;color:#f1f3f4;text-shadow:0 1px 6px rgba(0,0,0,.6)}

/* ---------- meta strip ---------- */
.ctnl .meta{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:0;border-block:1px solid var(--line);margin-block:clamp(28px,4vw,48px)}
.ctnl .meta div{padding:16px 18px 16px 0}
.ctnl .meta div+div{padding-left:18px;border-left:1px solid var(--line)}
.ctnl .meta dt{font-family:var(--mono);font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin:0 0 4px}
.ctnl .meta dd{margin:0;font-size:15px;font-variant-numeric:tabular-nums}

/* ---------- statement ---------- */
.ctnl .statement{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,2fr);gap:clamp(20px,5vw,72px);padding-block:clamp(24px,4vw,56px)}
.ctnl .statement h2,.ctnl .sec-h h2{font-family:var(--mono);font-weight:500;font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin:6px 0 0}
.ctnl .statement p{max-width:var(--measure);margin:0 0 1em;font-size:clamp(17px,1.4vw,19px)}
.ctnl .statement p:first-child::first-line{font-variant:small-caps;letter-spacing:.04em}

/* ---------- timeline ---------- */
.ctnl .timeline{padding-block:clamp(16px,3vw,32px) clamp(40px,6vw,80px)}
.ctnl .tl-row{display:grid;grid-template-columns:150px minmax(0,1fr);gap:20px;align-items:center;padding-block:14px;border-top:1px solid var(--line)}
.ctnl .tl-row:last-child{border-bottom:1px solid var(--line)}
.ctnl .tl-label{font-family:var(--mono);font-size:12px;line-height:1.4;color:var(--muted)}
.ctnl .tl-label b{display:block;color:var(--ink);font-weight:500;font-family:var(--body);font-size:14px}
.ctnl .tl-track{position:relative;height:44px}
.ctnl .tl-track::before{content:"";position:absolute;left:0;right:0;top:50%;height:1px;background:var(--line)}
.ctnl .tick{position:absolute;top:50%;width:2px;height:14px;transform:translate(-1px,-50%);background:var(--muted);opacity:.55}
.ctnl .tick.kept{height:30px;width:3px;background:var(--accent);opacity:1}
.ctnl .tl-ends{position:absolute;inset:auto 0 -4px 0;display:flex;justify-content:space-between;font-family:var(--mono);font-size:10.5px;color:var(--muted);font-variant-numeric:tabular-nums;transform:translateY(100%)}
.ctnl .tl-key{display:flex;gap:22px;flex-wrap:wrap;margin-top:34px;font-family:var(--mono);font-size:11.5px;color:var(--muted)}
.ctnl .tl-key i{display:inline-block;width:3px;height:14px;vertical-align:-2px;margin-right:8px;background:var(--accent)}
.ctnl .tl-key i.s{width:2px;height:10px;background:var(--muted);opacity:.55;vertical-align:0}

/* ---------- movements ---------- */
.ctnl .movement{padding-block:clamp(40px,6vw,88px)}
.ctnl .mv-head{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,2fr);gap:clamp(20px,5vw,72px);align-items:end;margin-bottom:clamp(28px,4vw,56px)}
.ctnl .mv-num{font-family:var(--display);font-size:clamp(64px,10vw,150px);line-height:.8;color:var(--ice);margin:0}
.ctnl .mv-head h3{font-family:var(--display);font-weight:400;font-size:clamp(30px,4vw,56px);line-height:1;margin:0 0 12px;letter-spacing:-.01em}
.ctnl .mv-head h3 small{display:block;font-family:var(--mono);font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin-bottom:12px}
.ctnl .mv-head p{margin:0;max-width:var(--measure);color:var(--muted)}

.ctnl .frame{margin:0 0 clamp(40px,6vw,88px)}
.ctnl .frame button{all:unset;display:block;cursor:zoom-in;width:100%}
.ctnl .frame button:focus-visible{outline:2px solid var(--accent);outline-offset:4px}
.ctnl .frame img{width:100%;background:var(--surface)}
.ctnl .cap{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:8px 24px;margin-top:14px;align-items:baseline}
.ctnl .cap h4{font-family:var(--display);font-weight:400;font-size:clamp(21px,2vw,26px);margin:0;line-height:1.15}
.ctnl .cap p{grid-column:1/-1;margin:0;max-width:var(--measure);color:var(--muted);font-size:15px}
.ctnl .exif{font-family:var(--mono);font-size:11.5px;color:var(--muted);font-variant-numeric:tabular-nums;white-space:nowrap}
.ctnl .exif b{color:var(--accent);font-weight:500}

.ctnl .frame.inset{width:min(100%,1100px)}
.ctnl .frame.inset.r{margin-left:auto}
.ctnl .pair{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:clamp(12px,2vw,28px);margin:0 0 clamp(40px,6vw,88px)}
.ctnl .pair .frame{margin:0}
.ctnl .side{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,4fr);gap:clamp(20px,4vw,64px);align-items:center;margin:0 0 clamp(40px,6vw,88px)}
.ctnl .side .frame{margin:0}
.ctnl .side blockquote{margin:0;font-family:var(--display);font-style:italic;font-size:clamp(24px,2.6vw,36px);line-height:1.25;text-wrap:balance;color:var(--ink)}
.ctnl .side blockquote cite{display:block;margin-top:18px;font-family:var(--mono);font-style:normal;font-size:11.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}

.ctnl .divider{border:0;border-top:1px solid var(--line);margin:0}

/* ---------- the edit ---------- */
.ctnl .edit{padding-block:clamp(48px,7vw,104px)}
.ctnl .sec-h{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,2fr);gap:clamp(20px,5vw,72px);margin-bottom:clamp(24px,3vw,40px)}
.ctnl .sec-h p{margin:0;max-width:var(--measure);font-size:clamp(17px,1.4vw,19px)}
.ctnl .compare-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,300px),1fr));gap:clamp(12px,2vw,28px);align-items:end}
.ctnl .compare{position:relative;overflow:hidden;background:var(--surface);aspect-ratio:2400/1351;user-select:none;touch-action:pan-y}
.ctnl .compare img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.ctnl .compare .after{clip-path:inset(0 0 0 var(--pos,50%))}
.ctnl .compare .handle{position:absolute;top:0;bottom:0;left:var(--pos,50%);width:2px;margin-left:-1px;background:#fff;box-shadow:0 0 0 1px rgba(0,0,0,.25);pointer-events:none}
.ctnl .compare .handle::after{content:"";position:absolute;top:50%;left:50%;width:30px;height:30px;margin:-15px 0 0 -15px;border-radius:50%;background:#fff;box-shadow:0 1px 6px rgba(0,0,0,.35)}
.ctnl .compare .tag{position:absolute;top:10px;font-family:var(--mono);font-size:10.5px;letter-spacing:.12em;text-transform:uppercase;color:#fff;background:rgba(14,17,19,.55);padding:4px 8px}
.ctnl .compare .tag.b{left:10px}.ctnl .compare .tag.a{right:10px}
.ctnl .compare input{position:absolute;inset:0;width:100%;height:100%;opacity:0;cursor:ew-resize;margin:0}
.ctnl .compare-cap{font-family:var(--mono);font-size:11.5px;color:var(--muted);margin-top:10px}
.ctnl .steps{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:0;margin-top:clamp(28px,4vw,48px);border-top:1px solid var(--line)}
.ctnl .steps div{padding:18px 22px 4px 0}
.ctnl .steps div+div{padding-left:22px;border-left:1px solid var(--line)}
.ctnl .steps h5{margin:0 0 6px;font-size:15px;font-weight:600}
.ctnl .steps p{margin:0;color:var(--muted);font-size:14.5px}

/* ---------- next chapter + footer ---------- */
.ctnl .next{padding-block:clamp(48px,7vw,96px);border-top:1px solid var(--line);display:grid;grid-template-columns:minmax(0,1fr) minmax(0,2fr);gap:clamp(20px,5vw,72px)}
.ctnl .next .chapter{margin:0;color:var(--accent)}
.ctnl .next p{margin:10px 0 0;max-width:var(--measure);color:var(--muted)}
.ctnl footer{padding-block:28px 40px;border-top:1px solid var(--line);display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;font-family:var(--mono);font-size:11.5px;color:var(--muted)}

/* ---------- lightbox ---------- */
.ctnl .lb{position:fixed;inset:0;z-index:50;background:rgba(8,10,11,.94);display:flex;align-items:center;justify-content:center;padding:calc(env(safe-area-inset-top,0px) + 56px) 16px calc(env(safe-area-inset-bottom,0px) + 56px)}
.ctnl .lb[hidden]{display:none}
.ctnl .lb img{max-height:100%;max-width:100%;width:auto;object-fit:contain}
.ctnl .lb p{position:absolute;left:0;right:0;bottom:calc(env(safe-area-inset-bottom,0px) + 18px);text-align:center;margin:0;font-family:var(--mono);font-size:12px;color:#c4ced3}
.ctnl .lb button{position:absolute;background:none;border:0;color:#e6ecee;font:500 13px var(--mono);letter-spacing:.1em;text-transform:uppercase;cursor:pointer;padding:12px}
.ctnl .lb .x{top:calc(env(safe-area-inset-top,0px) + 8px);right:10px}
.ctnl .lb .pv{left:6px;top:50%;transform:translateY(-50%)}
.ctnl .lb .nx{right:6px;top:50%;transform:translateY(-50%)}

@media (max-width:820px){
  .ctnl .mast,.ctnl .statement,.ctnl .mv-head,.ctnl .sec-h,.ctnl .next,.ctnl .side{grid-template-columns:minmax(0,1fr)}
  .ctnl .meta{grid-template-columns:repeat(2,minmax(0,1fr))}
  .ctnl .meta div:nth-child(3){padding-left:0;border-left:0}
  .ctnl .meta div:nth-child(n+3){border-top:1px solid var(--line)}
  .ctnl .compare-grid,.ctnl .steps{grid-template-columns:minmax(0,1fr)}
  .ctnl .steps div+div{padding-left:0;border-left:0;border-top:1px solid var(--line)}
  .ctnl .hero img{aspect-ratio:4/3}
  .ctnl .tl-row{grid-template-columns:minmax(0,1fr);gap:6px}
  .ctnl .cap{grid-template-columns:minmax(0,1fr)}
  .ctnl .exif{white-space:normal}
}
@media (max-width:520px){ .ctnl .pair{grid-template-columns:minmax(0,1fr)} }
@media (prefers-reduced-motion:no-preference){
  .ctnl .frame img{transition:filter .4s ease}
  .ctnl .frame button:hover img{filter:brightness(1.03) contrast(1.03)}
}

/* ---------- chapter index ---------- */
.ctnl .toc{display:flex;flex-wrap:wrap;gap:8px 28px;margin:26px 0 0;padding:0;list-style:none;font-family:var(--mono);font-size:12px;letter-spacing:.08em;color:var(--muted)}
.ctnl .toc a{text-decoration:none;border-bottom:1px solid var(--line);padding-bottom:2px}
.ctnl .toc a:hover{color:var(--ink);border-color:var(--accent)}
.ctnl .toc b{color:var(--accent);font-weight:500;margin-right:6px}
/* ---------- 5-day timeline ---------- */
.ctnl .tl-row.day .tl-track{height:36px}
.ctnl .tl-hours{display:grid;grid-template-columns:150px minmax(0,1fr);gap:20px;margin-top:10px}
.ctnl .tl-hours div{position:relative;height:14px;font-family:var(--mono);font-size:10.5px;color:var(--muted)}
.ctnl .tl-hours span{position:absolute;transform:translateX(-50%)}
.ctnl .tl-hours span:first-child{transform:none}.ctnl .tl-hours span:last-child{transform:translateX(-100%)}
.ctnl .tick.night{background:var(--accent);opacity:.35}
.ctnl .tl-note{font-family:var(--mono);font-size:11px;color:var(--accent);position:absolute;top:-2px;white-space:nowrap;transform:translateX(-100%);padding-right:10px}
/* ---------- between grid ---------- */
.ctnl .between{padding-block:clamp(40px,6vw,88px)}
.ctnl .mosaic{columns:3 280px;column-gap:clamp(12px,2vw,24px)}
.ctnl .mosaic .frame{break-inside:avoid;margin:0 0 clamp(18px,2.4vw,32px)}
.ctnl .mosaic .cap{margin-top:8px;grid-template-columns:minmax(0,1fr)}
.ctnl .mosaic .cap h4{font-size:18px}
.ctnl .mosaic .exif{white-space:normal}
/* ---------- night chapter ---------- */
.ctnl .night-band{background:#0b0e10;color:#e6ecee;--ink:#e6ecee;--muted:#93a1a8;--line:#262d31;--ice:#9db7c3;--accent:#7fcfa4;--surface:#161b1e}
.ctnl .night-band .movement{padding-block:clamp(56px,8vw,112px)}
.ctnl .night-band .mv-num{color:#7fcfa4}