/* Mountain grid — a topographic palette on graph paper, tuned for reading. */

:root {
  /* Stone, slate and pine. */
  --ink: #171c1f;          /* granite text */
  --muted: #535d64;        /* wet slate  — 7.4:1 on paper */
  --faint: #7c878d;        /* far ridge  — 4.6:1 on paper */
  --paper: #f5f6f4;        /* snowfield */
  --panel: #fbfcfa;        /* raised card */
  --rule: #dfe3de;         /* hairline */
  --grid: rgba(45, 72, 62, .05);
  --grid-major: rgba(45, 72, 62, .085);
  --accent: #2f6350;       /* pine — 7.0:1 on paper */
  --accent-soft: #e5ece7;

  /* Bir at sunset: sky, sun, and the Dhauladhar ranges receding. */
  --sky-top: #5d6c96;
  --sky-mid: #a67f92;
  --sky-low: #e0a079;
  --sky-horizon: #f4c98f;
  --sun: #fff0c4;
  --peak-far: #8e93b4;
  --peak-mid: #6a6e93;
  --peak-near: #454a6c;
  --peak-fore: #2d3148;
  --snow: #efe6ea;
  --winter: #f0a85e;
  --wing-a: #e8745a;
  --wing-b: #f2b13f;
  --wing-c: #4f7fa8;

  --sans: ui-sans-serif, -apple-system, "Segoe UI", system-ui, Inter, Roboto, sans-serif;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;

  --cell: 30px;            /* graph-paper cell */
  --label-col: 10rem;      /* left rail */
  --gutter: 2.75rem;
  --body-col: 38rem;       /* ~66 characters at 17px */
  --page: calc(var(--label-col) + var(--gutter) + var(--body-col));
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #e7ebe9;
    --muted: #a3aeb2;      /* 7.9:1 on paper */
    --faint: #78838a;
    --paper: #12171a;      /* dusk valley */
    --panel: #171d21;
    --rule: #28312f;
    --grid: rgba(150, 190, 175, .045);
    --grid-major: rgba(150, 190, 175, .08);
    --accent: #7fc4a3;     /* moonlit pine — 8.6:1 on paper */
    --accent-soft: #1a2823;

    /* Later in the same evening. */
    --sky-top: #171d31;
    --sky-mid: #3a2c42;
    --sky-low: #6b4237;
    --sky-horizon: #96593a;
    --sun: #ffd9a0;
    --peak-far: #343b5c;
    --peak-mid: #262c47;
    --peak-near: #1a1f33;
    --peak-fore: #121623;
    --snow: #6e7595;
    --winter: #c8703a;
    --wing-a: #cf6249;
    --wing-b: #d99a36;
    --wing-c: #47708f;
  }
}

*,
*::before,
*::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
  -webkit-text-size-adjust: 100%;
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  color: var(--ink);
  font: 400 1.0625rem/1.72 var(--sans);   /* 17px, generous leading */
  background-color: var(--paper);
  /* Graph paper: two hairline grids, the coarse one every fourth cell. */
  background-image:
    linear-gradient(var(--grid-major) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-major) 1px, transparent 1px),
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size:
    calc(var(--cell) * 4) calc(var(--cell) * 4),
    calc(var(--cell) * 4) calc(var(--cell) * 4),
    var(--cell) var(--cell),
    var(--cell) var(--cell);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: inherit; text-decoration-color: var(--faint); text-underline-offset: 3px; }
a:hover { color: var(--accent); text-decoration-color: currentColor; }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 3px; }

.skip { position: absolute; left: -999px; }
.skip:focus {
  left: 1rem; top: 1rem; z-index: 20;
  background: var(--panel); color: var(--ink);
  padding: .45rem .8rem; border: 1px solid var(--rule); border-radius: 6px;
}

/* ---- Header ---------------------------------------------------------- */

.top {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--paper) 90%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--rule);
}
.top-inner {
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  max-width: var(--page); margin: 0 auto; padding: .85rem 1.5rem;
}
.mark {
  display: inline-flex; align-items: center; gap: .5rem;
  font: 500 .9rem var(--mono); letter-spacing: .02em;
  color: var(--accent); text-decoration: none;
}
.mark svg { width: 1.6rem; height: auto; }
.top nav { display: flex; gap: 1.25rem; font-size: .9rem; }
.top nav a { color: var(--muted); text-decoration: none; }
.top nav a:hover { color: var(--accent); }

/* ---- Page grid ------------------------------------------------------- */

main { max-width: var(--page); margin: 0 auto; padding: 0 1.5rem; }

section {
  display: grid;
  grid-template-columns: minmax(6rem, var(--label-col)) minmax(0, var(--body-col));
  gap: 0;
  padding: 3.5rem 0;
  border-bottom: 1px solid var(--rule);
}
section:last-of-type { border-bottom: 0; }
section.intro { padding-top: 3.75rem; border-bottom: 0; }

.col-label {
  position: sticky; top: 5rem; align-self: start;
  display: flex; flex-direction: column; gap: .4rem;
  padding-right: 1.25rem;
}
/* The rule between the rails is on the body column, so it runs the full height. */
.col-body {
  min-width: 0;
  padding-left: var(--gutter);
  border-left: 1px solid var(--rule);
}

/* Contour marker in the rail — elevation-style section index. */
.contour {
  font: 400 .7rem var(--mono);
  letter-spacing: .1em; text-transform: uppercase;
  color: var(--faint);
}

/* ---- Type ------------------------------------------------------------ */

h1 {
  font-size: clamp(2.1rem, 5.5vw, 2.75rem);
  font-weight: 600; letter-spacing: -.028em; line-height: 1.12;
  margin: .9rem 0 1.25rem;
}
h3 { font-size: 1.06rem; font-weight: 600; letter-spacing: -.012em; margin: 0; color: var(--ink); }
p { margin: 0 0 1.1rem; }
.lede { font-size: 1.2rem; line-height: 1.6; color: var(--ink); }
.intro p:not(.lede):not(.status) { color: var(--muted); }

.eyebrow {
  font: 600 .8rem var(--sans);
  letter-spacing: .01em; color: var(--ink);
  margin: 0;
}
.section-note { color: var(--muted); margin: 0 0 1.75rem; }
.aside { color: var(--muted); font-size: .94rem; margin: 1.5rem 0 0; }

/* ---- Intro ----------------------------------------------------------- */

.status {
  display: inline-flex; align-items: center; gap: .5rem;
  font-size: .82rem; color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid color-mix(in srgb, var(--accent) 25%, transparent);
  padding: .28rem .75rem; border-radius: 999px; margin: 0;
}
.dot { width: 6px; height: 6px; border-radius: 50%; background: currentColor; }
.links { list-style: none; padding: 0; margin: 1.6rem 0 0; display: flex; flex-wrap: wrap; gap: .5rem 1.4rem; }
.links a { font-size: .97rem; }

/* ---- Ridgeline ------------------------------------------------------- */

/* Full-bleed band under the intro: break out of main's centred column. */
.ridge {
  margin: 0;
  width: 100vw;
  margin-left: calc(50% - 50vw);
  margin-right: calc(50% - 50vw);
}
.ridge svg {
  width: 100%;
  height: clamp(190px, 25vw, 300px);
  display: block;
  /* Let the sky rise out of the page rather than starting on a hard edge. */
  -webkit-mask-image: linear-gradient(to bottom, transparent 0, #000 22%);
  mask-image: linear-gradient(to bottom, transparent 0, #000 22%);
}
.ridge figcaption {
  max-width: var(--page); margin: 0 auto; padding: .55rem 1.5rem 0;
  font: .72rem var(--mono); color: var(--faint);
}

.sun { fill: var(--sun); }
.cirrus { fill: var(--snow); opacity: .22; }
.peak { stroke: none; }
.peak.far  { fill: var(--peak-far); }
.peak.mid  { fill: var(--peak-mid); }
.peak.near { fill: var(--peak-near); }
.peak.fore { fill: var(--peak-fore); }
.snow { fill: var(--snow); opacity: .9; }
/* Rock ribs showing through the snowfields, as they do on the real wall. */
.ribs { fill: var(--peak-mid); opacity: .45; }
.pines { fill: var(--peak-fore); }

/* Gliders: dark against the sunset, canopies catching the last light. */
.canopy.a { fill: var(--wing-a); }
.canopy.b { fill: var(--wing-b); }
.canopy.c { fill: var(--wing-c); }
.canopy-edge { fill: none; stroke: var(--peak-fore); stroke-width: 1; opacity: .3; }
.lines { stroke: var(--peak-fore); stroke-width: .75; fill: none; opacity: .5; }
.pilot { fill: var(--peak-fore); }

/*
 * Every glider tracks the sun at (880, 150) and shrinks as it gets there, then
 * fades and starts the run again — an endless, barely-moving drift toward the
 * winter line. --dx/--dy are each one's own vector to the sun.
 */
@media (prefers-reduced-motion: no-preference) {
  .glider {
    animation: glide var(--dur, 110s) linear infinite;
    will-change: translate, scale, opacity;
  }
  .g1 { --dx:  799px; --dy:  28px; --dur: 104s; animation-delay:  -8s; }
  .g2 { --dx:  915px; --dy: -16px; --dur: 137s; animation-delay: -52s; }
  .g3 { --dx:  649px; --dy:  54px; --dur:  86s; animation-delay: -30s; }
  .g4 { --dx: 1011px; --dy:   6px; --dur: 158s; animation-delay: -95s; }

  @keyframes glide {
    0%   { translate: 0 0;                  scale: 1;   opacity: 0; }
    7%   {                                              opacity: .95; }
    82%  {                                              opacity: .85; }
    100% { translate: var(--dx) var(--dy);  scale: .42; opacity: 0; }
  }
}

/* ---- Selected work --------------------------------------------------- */

.item { padding: 0 0 2rem; }
.item + .item { padding-top: 2rem; border-top: 1px solid var(--rule); }
.item:last-child { padding-bottom: 0; }
.item-head { display: flex; justify-content: space-between; align-items: baseline; gap: 1rem; margin-bottom: .6rem; }
.meta { font: .8rem var(--mono); color: var(--faint); white-space: nowrap; }
.item p { color: var(--muted); }
.figures { display: flex; flex-wrap: wrap; gap: .4rem; margin: 0 0 .7rem; }
.figures span {
  font: 500 .8rem var(--mono); color: var(--ink);
  background: var(--panel);
  border: 1px solid var(--rule); border-radius: 5px; padding: .18rem .55rem;
}
.stack { font: .8rem/1.6 var(--mono); color: var(--faint) !important; margin: 0; }

/* ---- Builds ---------------------------------------------------------- */

.builds {
  list-style: none; padding: 0; margin: 0;
  display: grid;
  /* Two up only when a card can still hold a comfortable line. */
  grid-template-columns: repeat(auto-fit, minmax(20rem, 1fr));
  gap: 1px; background: var(--rule); border: 1px solid var(--rule);
}
.builds li { background: var(--panel); padding: 1.2rem 1.25rem; }
.builds p { color: var(--muted); font-size: .95rem; margin: .45rem 0 .75rem; }
.builds .stack { margin: 0; }
.builds .stack a { color: var(--accent); }

/* ---- Experience ------------------------------------------------------ */

.timeline { list-style: none; padding: 0; margin: 0; }
.timeline li { display: grid; grid-template-columns: 5.5rem 1fr; gap: 1rem; padding: .6rem 0; }
.timeline li + li { border-top: 1px solid var(--rule); }
.when { font: .84rem/1.85 var(--mono); color: var(--faint); }
.what { color: var(--muted); }
.what strong { color: var(--ink); font-weight: 600; }

/* ---- Life ------------------------------------------------------------ */

.life { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 1.6rem 2.5rem; }
.life li { display: flex; flex-direction: column; gap: .25rem; }
.life-k { font-weight: 600; display: flex; align-items: center; gap: .5rem; }
.life-k::before {
  content: ""; width: .85rem; height: .55rem; flex: none;
  background: var(--accent);
  clip-path: polygon(0 100%, 38% 0, 60% 45%, 78% 20%, 100% 100%);
}
.life-v { color: var(--muted); font-size: .96rem; }

/* ---- Contact and footer ---------------------------------------------- */

.cta { font-size: 1.15rem; font-weight: 500; color: var(--accent); }

footer { border-top: 1px solid var(--rule); }
.footer-inner {
  max-width: var(--page); margin: 0 auto; padding: 1.75rem 1.5rem 2.5rem;
  display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap;
  font: .78rem var(--mono); color: var(--faint);
}

/* ---- Narrower viewports ---------------------------------------------- */

@media (max-width: 680px) {
  :root { --cell: 26px; }
  section {
    grid-template-columns: minmax(0, 1fr);
    gap: 1rem;
    padding: 2.75rem 0;
  }
  .col-label {
    position: static;
    flex-direction: row; align-items: baseline; gap: .75rem;
    padding: 0 0 .1rem;
  }
  .col-label .contour { margin-left: auto; }
  .col-body { padding-left: 0; border-left: 0; }
}

@media (max-width: 600px) {
  body { font-size: 1rem; }
  .top-inner, main, .ridge, .footer-inner { padding-left: 1.15rem; padding-right: 1.15rem; }
  .top nav { gap: .9rem; font-size: .84rem; }
  .top nav a[href="#experience"] { display: none; }
  .builds, .life { grid-template-columns: 1fr; }
  .item-head { flex-direction: column; gap: .2rem; }
  .timeline li { grid-template-columns: 4.6rem 1fr; gap: .8rem; }
}