/* Headline tunnel on the blog index. The section is hidden until tunnel.js runs; without JavaScript the plain lists stay. */
.tn-track { display: none; position: relative; height: calc(100vh + (var(--tn-n) - 1) * 85vh); }
.tn-on .tn-track { display: block; }
.tn-stick { position: sticky; top: 0; height: 100vh; overflow: hidden; }
.tn-canvas { display: block; width: 100%; height: 100%; }
.tn-canvas.tn-link { cursor: pointer; }
.tn-index { position: absolute; left: var(--gutter); top: 50%; transform: translateY(-50%); list-style: none; margin: 0; padding: 0; max-width: 15rem; font: 0.8rem/1.35 var(--sans); }
.tn-index a { display: block; padding: 0.45rem 0.7rem; color: var(--ink-faint); text-decoration: none; border-left: 2px solid var(--rule); transition: color 0.3s, border-color 0.3s; }
.tn-index a span { display: block; font-size: 0.7rem; letter-spacing: 0.1em; color: var(--ink-faint); }
.tn-index a.on { color: var(--ink); border-left-color: var(--accent); }
.tn-index a.on span { color: var(--accent); }
.tn-hint { position: absolute; bottom: 1.5rem; left: 50%; transform: translateX(-50%); font: 0.72rem var(--sans); letter-spacing: 0.3em; text-transform: uppercase; color: var(--ink-faint); transition: opacity 0.5s; }
@media (max-width: 900px) { .tn-index { display: none; } }