/* ============================================================
   Design tokens — one coherent system, tuned on φ (1.618)
   • type  : √φ (1.272) modular scale, anchored at 17px body
   • space : Fibonacci (consecutive ratios converge on φ)
   • line-height: 1.618 (golden) for body copy
   ============================================================ */
:root {
  /* colour — light "drafting paper" (default) */
  --paper:        #e7e8e3;
  --paper-raise:  #eeefe9;
  --ink:          #18181b;
  --ink-soft:     #57575e;
  --ink-dim:      #5d5d56;
  --rule:         #cbccc4;
  --rule-strong:  #b6b7ae;
  --accent:       #e8521e;   /* signal — fills, marks, hovers */
  --accent-text:  #b23c12;   /* signal — text-safe on paper   */
  --on-accent:    #f7f4ee;

  /* type — √φ scale */
  --fs-cap:  0.835rem;   /* 13.4px — labels, data, captions  */
  --fs-body: 1.0625rem;  /* 17px   — body                    */
  --fs-lead: 1.35rem;    /* 21.6px — roles, project names    */
  --fs-h2:   1.72rem;    /* 27.5px — contact, sub-display    */
  --fs-h1:   clamp(2.6rem, 6.6vw, 4.45rem); /* nameplate     */
  --lh-body: 1.618;      /* golden */
  --lh-tight: 1.04;

  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --sans: "IBM Plex Sans", system-ui, -apple-system, Segoe UI, Roboto, sans-serif;

  /* spacing — Fibonacci (px) */
  --sp-1: .5rem;     /*   8 */
  --sp-2: .8125rem;  /*  13 */
  --sp-3: 1.3125rem; /*  21 */
  --sp-4: 2.125rem;  /*  34 */
  --sp-5: 3.4375rem; /*  55 */
  --sp-6: 5.5625rem; /*  89 */
  --sp-7: 9rem;      /* 144 */

  --measure: 38rem;   /* line length */
  --wrap: 62rem;      /* 992px */
  --gutter: 14.5625rem; /* 233px — Fibonacci */
  --mast-h: 3.4375rem;  /*  55px — Fibonacci */
}
html[data-theme="dark"] {
  --paper:        #161617;
  --paper-raise:  #1d1d1f;
  --ink:          #e9e8e2;
  --ink-soft:     #9c9c94;
  --ink-dim:      #86867d;
  --rule:         #2b2b2d;
  --rule-strong:  #3a3a3d;
  --accent:       #ff6a38;
  --accent-text:  #ff7c4f;
  --on-accent:    #161617;
}

/* ============================================================
   Base
   ============================================================ */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: var(--sp-6); }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
/* atmosphere: faint 55px drafting-grid, concentrated up top, faded to the edges */
body::before {
  content: ""; position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background-image:
    linear-gradient(var(--rule) 1px, transparent 1px),
    linear-gradient(90deg, var(--rule) 1px, transparent 1px);
  background-size: 55px 55px;
  -webkit-mask-image: radial-gradient(125% 80% at 50% -8%, #000 26%, transparent 72%);
  mask-image: radial-gradient(125% 80% at 50% -8%, #000 26%, transparent 72%);
  opacity: .42;
}
h1, h2, h3, p, ul, dl { margin: 0; }
a { color: inherit; text-decoration: none; }
strong { font-weight: 600; color: var(--ink); }
.dim { color: var(--ink-dim); }
::selection { background: var(--accent); color: var(--on-accent); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding-inline: clamp(1.25rem, 5vw, 2.75rem); }

.skip-link {
  position: absolute; left: -999px; top: 0; z-index: 100;
  background: var(--ink); color: var(--paper); padding: .625rem 1rem; font-family: var(--mono); font-size: var(--fs-cap);
}
.skip-link:focus { left: 0; }

/* mono utility for labels / data */
.kicker, .row-label, .entry-when, .work-name, .work-tech, .defs dt,
.record dt, .sig, .mast-nav a, .toggle, .footer-inner, .contact-email, .row-foot {
  font-family: var(--mono);
}

/* ============================================================
   Masthead
   ============================================================ */
.masthead {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--paper) 85%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid transparent;
  transition: border-color .25s;
}
.masthead.scrolled { border-bottom-color: var(--rule); }
.masthead-inner { display: flex; align-items: center; gap: var(--sp-3); height: var(--mast-h); }
.sig { display: inline-flex; align-items: center; gap: .625rem; font-size: var(--fs-cap); font-weight: 600; letter-spacing: .02em; }
.sig-mark {
  display: grid; place-items: center; width: 1.625rem; height: 1.625rem;
  border: 1.5px solid var(--accent); color: var(--ink); font-weight: 700; font-size: .75rem;
}
.sig-name { color: var(--ink); }
.mast-nav { margin-left: auto; display: flex; gap: var(--sp-3); }
.mast-nav a { font-size: var(--fs-cap); color: var(--ink-soft); padding-bottom: 2px; border-bottom: 1px solid transparent; transition: color .15s, border-color .15s; }
.mast-nav a:hover, .mast-nav a.active { color: var(--ink); border-bottom-color: var(--accent); }
.toggle {
  display: inline-flex; align-items: center; gap: .4375rem; cursor: pointer;
  background: none; border: none; color: var(--ink-soft); font-size: var(--fs-cap); padding: 4px 2px;
}
.toggle:hover { color: var(--ink); }
.toggle-dot { width: .625rem; height: .625rem; border: 1.5px solid currentColor; border-radius: 50%; background: linear-gradient(90deg, currentColor 50%, transparent 50%); }

/* ============================================================
   Hero — identity record (the signature)
   ============================================================ */
.hero { padding-block: clamp(var(--sp-5), 11vh, var(--sp-7)) var(--sp-6); }
.kicker { font-size: var(--fs-cap); letter-spacing: .04em; color: var(--ink-soft); margin-bottom: var(--sp-3); }
.kicker::before { content: "▸ "; color: var(--accent); }
.nameplate {
  font-family: var(--mono); font-weight: 600;
  font-size: var(--fs-h1); line-height: var(--lh-tight); letter-spacing: -.035em;
  margin-bottom: var(--sp-4);
}
.record { border-top: 1px solid var(--rule); max-width: 47rem; }
.record-row {
  display: grid; grid-template-columns: 7rem 1fr; gap: var(--sp-3);
  padding: var(--sp-2) 0; border-bottom: 1px solid var(--rule);
}
.record dt { font-size: var(--fs-cap); text-transform: uppercase; letter-spacing: .08em; color: var(--ink-dim); padding-top: 3px; }
.record dd { margin: 0; color: var(--ink); }
.status { display: inline-flex; align-items: center; gap: .5625rem; font-weight: 500; color: var(--accent-text); }
.status-dot { width: .5625rem; height: .5625rem; border-radius: 50%; background: var(--accent); animation: ping 2.6s ease-out infinite; }
@keyframes ping { 0% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--accent) 55%, transparent); } 70%, 100% { box-shadow: 0 0 0 .5rem transparent; } }

.hero-actions { display: flex; flex-wrap: wrap; gap: var(--sp-3) var(--sp-4); margin-top: var(--sp-4); font-family: var(--mono); font-size: var(--fs-cap); }
.lnk { color: var(--ink-soft); border-bottom: 1px solid var(--rule-strong); padding-bottom: 3px; transition: color .15s, border-color .15s; }
.lnk:hover { color: var(--ink); border-bottom-color: var(--accent); }
.lnk-strong { color: var(--ink); font-weight: 600; border-bottom-color: var(--accent); }
.lnk-strong:hover { color: var(--accent-text); }

/* ============================================================
   Rows — label-gutter datasheet layout (every section)
   ============================================================ */
.row { border-top: 1px solid var(--rule); }
.row-grid { display: grid; grid-template-columns: var(--gutter) 1fr; gap: var(--sp-4); padding-block: var(--sp-6); }
.row-label {
  font-size: var(--fs-cap); text-transform: uppercase; letter-spacing: .14em; color: var(--ink-soft);
  position: sticky; top: calc(var(--mast-h) + var(--sp-3)); align-self: start;
}
.row-label::before { content: "// "; color: var(--accent); }
.row-body { min-width: 0; }
.prose p { color: var(--ink-soft); max-width: var(--measure); }
.prose p + p { margin-top: var(--sp-3); }

/* Experience */
.entry { padding-top: var(--sp-4); }
.entry + .entry { margin-top: var(--sp-4); border-top: 1px solid var(--rule); }
.entry:first-child { padding-top: 0; }
.entry-when { font-size: var(--fs-cap); letter-spacing: .04em; color: var(--accent-text); margin-bottom: var(--sp-1); }
.entry-role { font-size: var(--fs-lead); font-weight: 600; color: var(--ink); letter-spacing: -.01em; }
.entry-org { font-weight: 400; color: var(--ink-soft); }
.entry-points { list-style: none; padding: 0; margin-top: var(--sp-2); display: grid; gap: var(--sp-1); max-width: var(--measure); }
.entry-points li { position: relative; padding-left: 1.3125rem; color: var(--ink-soft); }
.entry-points li::before { content: "—"; position: absolute; left: 0; color: var(--accent); }

/* Selected work — ruled reference list */
.worklist { list-style: none; padding: 0; border-top: 1px solid var(--rule); }
.worklist li { border-bottom: 1px solid var(--rule); }
.work {
  display: grid; grid-template-columns: minmax(0, 15.5rem) 1fr; gap: var(--sp-2) var(--sp-4);
  align-items: baseline; position: relative; padding: var(--sp-3) 2.125rem var(--sp-3) 0;
  transition: background .15s;
}
.work:hover { background: var(--paper-raise); }
.work-name { font-size: var(--fs-lead); font-weight: 600; color: var(--ink); letter-spacing: -.01em; transition: color .15s; }
.work:hover .work-name { color: var(--accent-text); }
.work-tech { display: block; grid-column: 1; font-size: var(--fs-cap); color: var(--ink-dim); margin-top: var(--sp-1); }
.work-desc { grid-column: 2; grid-row: 1 / span 2; color: var(--ink-soft); align-self: center; }
.work-arrow { position: absolute; right: .375rem; top: var(--sp-3); color: var(--accent); opacity: .4; transition: opacity .15s, transform .15s; }
.work:hover .work-arrow, .work:focus-visible .work-arrow { opacity: 1; transform: translateX(3px); }
.row-foot { margin-top: var(--sp-3); font-size: var(--fs-cap); color: var(--ink-soft); }
.row-foot a { color: var(--accent-text); border-bottom: 1px solid var(--rule-strong); }
.row-foot a:hover { border-bottom-color: var(--accent); }

/* Definition lists — stack + credentials */
.defs { border-top: 1px solid var(--rule); }
.defs > div { display: grid; grid-template-columns: 10.5rem 1fr; gap: var(--sp-3); padding: var(--sp-2) 0; border-bottom: 1px solid var(--rule); }
.defs dt { font-size: var(--fs-cap); text-transform: uppercase; letter-spacing: .06em; color: var(--ink-dim); padding-top: 3px; }
.defs dd { margin: 0; color: var(--ink); }

/* Contact */
.contact-lead { color: var(--ink-soft); max-width: 34rem; }
.contact-email { display: inline-block; margin-top: var(--sp-3); font-size: clamp(var(--fs-lead), 4vw, var(--fs-h2)); font-weight: 500; letter-spacing: -.01em; color: var(--ink); border-bottom: 2px solid var(--accent); padding-bottom: 4px; }
.contact-email:hover { color: var(--accent-text); }
.contact-alt { margin-top: var(--sp-4); display: flex; flex-wrap: wrap; gap: var(--sp-4); font-family: var(--mono); font-size: var(--fs-cap); }
.contact-alt a { color: var(--ink-soft); border-bottom: 1px solid var(--rule-strong); padding-bottom: 2px; transition: color .15s, border-color .15s; }
.contact-alt a:hover { color: var(--ink); border-bottom-color: var(--accent); }

/* Footer */
.footer { border-top: 1px solid var(--rule); }
.footer-inner { display: flex; justify-content: space-between; gap: var(--sp-2); padding-block: var(--sp-4); font-size: var(--fs-cap); color: var(--ink-dim); }

/* ============================================================
   Motion — one orchestrated moment (hero), set by script.js
   ============================================================ */
html.js .stagger { opacity: 0; transform: translateY(.625rem); }
.stagger.lit { animation: rise .55s cubic-bezier(.2, .7, .2, 1) forwards; }
@keyframes rise { to { opacity: 1; transform: none; } }

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 760px) {
  :root { --gutter: 1fr; }
  .mast-nav { display: none; }
  .row-grid { grid-template-columns: 1fr; gap: var(--sp-3); padding-block: var(--sp-5); }
  .row-label { position: static; }
  .record-row { grid-template-columns: 5.75rem 1fr; gap: var(--sp-2); }
  .work { grid-template-columns: 1fr; gap: 4px; }
  .work-desc { grid-column: 1; grid-row: auto; }
  .work-tech { margin-top: 2px; }
  .defs > div { grid-template-columns: 1fr; gap: 4px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .stagger { opacity: 1; transform: none; }
  .stagger.lit { animation: none; }
  .status-dot { animation: none; }
}