/* ═══════════════════════════════════════════════════════════════════════════
   SAM MORAN — landing / router
   A diptych. Swiss grid and hairline rules borrowed from sammoran.phd, warm
   palette borrowed from sammoran.music, so this page reads as the shared
   parent of both rather than a third identity.
   ═══════════════════════════════════════════════════════════════════════════ */

:root {
  /* Surface — the academic site's paper stock */
  --ivory: #f2efe7;
  --paper: #faf8f1;
  --ink: #151515;
  --ink-soft: rgba(21, 21, 21, 0.62);
  --rule: rgba(21, 21, 21, 0.24);

  /* Shared accents. The two sites already agree on a warm red and a gold;
     those are the only colours this page is allowed to use. */
  --red: #f03727;
  --yellow: #ffc515;
  --cream: #fff7ec;

  --sans: Arial, Helvetica, sans-serif;
  --serif: "Iowan Old Style", "Baskerville", Georgia, serif;

  /* Rhythm */
  --frame: 10px;
  --gutter: clamp(20px, 3.2vw, 54px);
  --bar-h: clamp(52px, 6vh, 74px);

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --swell: 760ms;
}

* { box-sizing: border-box; }

html { height: 100%; }

body {
  margin: 0;
  min-height: 100svh;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  background: var(--ivory);
  color: var(--ink);
  font-family: var(--sans);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img { display: block; width: 100%; height: auto; }
h1, p { margin: 0; }
::selection { color: var(--paper); background: var(--red); }

:focus-visible {
  outline: 3px solid var(--yellow);
  outline-offset: -6px;
}

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
}

/* ── Frame + grain ───────────────────────────────────────────────────────── */
/* The inset paper border is the one motif carried verbatim from sammoran.phd. */

.frame {
  position: fixed;
  inset: 0;
  z-index: 60;
  pointer-events: none;
  border: var(--frame) solid var(--paper);
  box-shadow: inset 0 0 0 1px rgba(21, 21, 21, 0.15);
}

.grain {
  position: fixed;
  inset: 0;
  z-index: 55;
  pointer-events: none;
  opacity: 0.32;
  mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)' opacity='0.42'/%3E%3C/svg%3E");
}

/* ── Rule bars ───────────────────────────────────────────────────────────── */

.bar {
  position: relative;
  z-index: 20;
  min-height: var(--bar-h);
  display: flex;
  align-items: center;
  gap: var(--gutter);
  padding: 10px calc(var(--gutter) + var(--frame));
  background: var(--ivory);
}

/* Three tracks so the socials sit optically centred in the bar regardless of
   how wide the wordmark and the location line happen to be. */
.bar--top {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  border-bottom: 1px solid var(--ink);
}
.bar--bottom { border-top: 1px solid var(--ink); }

.bar__end,
.email,
.panel__kicker,
.panel__cta-label,
.panel__edge {
  font-size: 0.62rem;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.bar__end { color: var(--ink-soft); white-space: nowrap; }

.wordmark {
  font-size: 1.45rem;
  font-weight: 900;
  letter-spacing: -0.08em;
  line-height: 1;
}
.wordmark__reg {
  margin-left: 3px;
  color: var(--red);
  font-size: 0.42em;
  vertical-align: top;
}

/* Socials — bordered icon chips, the same device the academic header uses */

.socials {
  display: flex;
  gap: 7px;
  justify-self: center;
}
.socials a {
  height: 33px;
  padding: 0 11px;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  border: 1px solid var(--ink);
  color: var(--ink);
  transition: color 220ms var(--ease), background-color 220ms var(--ease),
              transform 220ms var(--ease);
}
.socials__label {
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  white-space: nowrap;
}
.socials a:hover,
.socials a:focus-visible {
  color: var(--paper);
  background: var(--ink);
  transform: translateY(-2px);
}

.icon { width: 15px; height: 15px; display: block; }
.icon--fill { fill: currentColor; }
/* Instagram is drawn as an outline; a heavier stroke matches the optical weight
   of the filled marks beside it at 15px. */
.icon--stroke {
  fill: none;
  stroke: currentColor;
  stroke-width: 2.3;
}
.icon--stroke .icon__dot { fill: currentColor; stroke: none; }

.email {
  margin-left: auto;
  position: relative;
  color: var(--ink-soft);
  white-space: nowrap;
}
.email::after {
  content: "";
  position: absolute;
  left: 0; right: 100%; bottom: -5px;
  height: 2px;
  background: var(--red);
  transition: right 260ms var(--ease);
}
.email:hover, .email:focus-visible { color: var(--ink); }
.email:hover::after, .email:focus-visible::after { right: 0; }

/* ── The split ───────────────────────────────────────────────────────────── */

.split {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 0;
  transition: grid-template-columns var(--swell) var(--ease);
}

/* One side leans in when the other is engaged. :has() keeps this in CSS —
   no script needed for the whole page. */
.split:has(.panel--research:hover),
.split:has(.panel--research:focus-visible) { grid-template-columns: 1.24fr 0.76fr; }

.split:has(.panel--music:hover),
.split:has(.panel--music:focus-visible) { grid-template-columns: 0.76fr 1.24fr; }

/* ── Panels ──────────────────────────────────────────────────────────────── */

.panel {
  --panel-bg: var(--ivory);
  --panel-accent: var(--red);
  --scrim: 242, 239, 231;          /* --ivory, as channels for the gradient */

  position: relative;
  display: block;
  overflow: hidden;
  min-height: 0;
  background: var(--panel-bg);
  isolation: isolate;
}

.panel--music {
  --panel-bg: var(--cream);
  --panel-accent: var(--red);
  --scrim: 255, 247, 236;          /* --cream */
}

.panel + .panel { border-left: 1px solid var(--ink); }

/* Media */

.panel__media {
  position: absolute;
  inset: 0;
  display: block;
  overflow: hidden;
  z-index: -2;
}
/* Both source files are cropped so the eye line sits at 30% of image height.
   Because cover scales to the panel width, an object-position-Y equal to that
   same 30% pins the eyes to exactly 30% of the PANEL height whatever the panel
   measures — so the two faces stay level at rest, mid-swell and stacked. Change
   one number here and you must re-crop; see README. */
.panel__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 50% 30%;
  filter: grayscale(0.78) contrast(1.05) brightness(0.98);
  transform: scale(1.04);
  /* Pivot the zoom about the eye line too, so hovering one panel doesn't nudge
     its face out of level with the other. */
  transform-origin: 50% 30%;
  transition: filter var(--swell) var(--ease), transform 1100ms var(--ease);
}

.panel:hover .panel__media img,
.panel:focus-visible .panel__media img {
  filter: grayscale(0) contrast(1) brightness(1);
  transform: scale(1.09);
}

/* Scrim — keeps the type legible and blends the photo into the page stock.
   It has to be fully clear by ~60% up, because the chin sits around 58% and the
   old ramp (0.72 at 34%) washed straight over the face. Text lives below 39%. */
.panel__media::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(
    to top,
    rgb(var(--scrim)) 6%,
    rgba(var(--scrim), 0.88) 24%,
    rgba(var(--scrim), 0.50) 36%,
    rgba(var(--scrim), 0.16) 46%,
    transparent 60%
  );
  transition: opacity var(--swell) var(--ease);
}
.panel:hover .panel__media::after,
.panel:focus-visible .panel__media::after { opacity: 0.82; }

/* Index numeral + rotated edge label */

.panel__index {
  position: absolute;
  top: clamp(14px, 2.4vh, 26px);
  left: var(--gutter);
  z-index: 3;
  font-family: var(--serif);
  font-size: clamp(1.6rem, 3.4vw, 2.9rem);
  font-style: italic;
  line-height: 1;
  color: var(--ink);
  opacity: 0.34;
  transition: opacity 420ms var(--ease), color 420ms var(--ease);
}
.panel:hover .panel__index,
.panel:focus-visible .panel__index { opacity: 1; color: var(--panel-accent); }

.panel__edge {
  position: absolute;
  top: clamp(14px, 2.4vh, 26px);
  right: calc(var(--gutter) - 4px);
  z-index: 3;
  writing-mode: vertical-rl;
  color: var(--ink-soft);
  transition: color 420ms var(--ease);
}
.panel:hover .panel__edge,
.panel:focus-visible .panel__edge { color: var(--ink); }

/* Body */

.panel__body {
  position: absolute;
  right: var(--gutter);
  bottom: clamp(20px, 4vh, 46px);
  left: var(--gutter);
  z-index: 3;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: clamp(8px, 1.2vh, 14px);
  max-width: 46ch;
}

.panel__kicker {
  display: inline-block;
  padding: 6px 10px;
  color: var(--ink);
  background: var(--yellow);
}

.panel__title {
  display: block;
  font-family: var(--serif);
  font-size: clamp(2.6rem, 6.4vw, 5.6rem);
  font-weight: 400;
  line-height: 0.92;
  letter-spacing: -0.02em;
}

.panel__desc {
  display: block;
  max-width: 40ch;
  font-size: clamp(0.82rem, 1.05vw, 0.95rem);
  line-height: 1.5;
  color: var(--ink-soft);
}

.panel__cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-top: clamp(2px, 0.8vh, 8px);
  padding: 11px 16px;
  color: var(--paper);
  background: var(--ink);
  transition: background-color 300ms var(--ease), color 300ms var(--ease);
}
.panel:hover .panel__cta,
.panel:focus-visible .panel__cta {
  color: var(--paper);
  background: var(--panel-accent);
}

.panel__arrow {
  width: 15px;
  height: 15px;
  flex: none;
  transition: transform 380ms var(--ease);
}
.panel:hover .panel__arrow,
.panel:focus-visible .panel__arrow { transform: translateX(5px); }

/* ── Seam ────────────────────────────────────────────────────────────────── */

.seam {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  z-index: 10;
  display: grid;
  place-items: center;
  pointer-events: none;
  transform: translateX(-50%);
  transition: left var(--swell) var(--ease);
}
.split:has(.panel--research:hover) .seam,
.split:has(.panel--research:focus-visible) .seam { left: 62%; }
.split:has(.panel--music:hover) .seam,
.split:has(.panel--music:focus-visible) .seam { left: 38%; }

.seam__badge {
  display: grid;
  place-items: center;
  width: clamp(46px, 5.4vw, 62px);
  aspect-ratio: 1;
  border: 1px solid var(--ink);
  border-radius: 50%;
  background: var(--paper);
  color: var(--ink);
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

/* ── Entrance ────────────────────────────────────────────────────────────── */

@media (prefers-reduced-motion: no-preference) {
  .bar, .panel, .seam__badge {
    animation: rise 900ms var(--ease) both;
  }
  .panel--research { animation-delay: 90ms; }
  .panel--music { animation-delay: 180ms; }
  .bar--bottom { animation-delay: 260ms; }
  .seam__badge { animation-delay: 340ms; }
}

@keyframes rise {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: none; }
}
.seam__badge { animation-name: pop; }
@keyframes pop {
  from { opacity: 0; transform: scale(0.6); }
  to { opacity: 1; transform: none; }
}

/* ── Narrow / touch ──────────────────────────────────────────────────────── */

@media (max-width: 860px) {
  body { min-height: 100svh; }

  .split {
    grid-template-columns: 1fr;
    grid-auto-rows: minmax(310px, 1fr);
  }
  /* Hover-swell is a pointer affordance; stacked panels stay equal. */
  .split:has(.panel--research:hover),
  .split:has(.panel--research:focus-visible),
  .split:has(.panel--music:hover),
  .split:has(.panel--music:focus-visible) { grid-template-columns: 1fr; }

  .panel + .panel { border-top: 1px solid var(--ink); border-left: 0; }

  .seam {
    top: 50%;
    right: 0;
    bottom: auto;
    left: 0;
    transform: translateY(-50%);
  }
  .split:has(.panel--research:hover) .seam,
  .split:has(.panel--research:focus-visible) .seam,
  .split:has(.panel--music:hover) .seam,
  .split:has(.panel--music:focus-visible) .seam { left: 0; }

  /* No object-position override here: the 30% value is what keeps the two
     faces level, and it holds at every panel size. */
  .panel__body { max-width: none; }

  /* The labelled row needs ~535px in the centre track; below this the wordmark
     starts getting squeezed, so the chips go back to icon-only squares. */
  .socials__label { display: none; }
  .socials a { width: 33px; padding: 0; justify-content: center; }

  .bar--bottom { flex-wrap: wrap; gap: 10px var(--gutter); }
}

@media (max-width: 560px) {
  :root { --gutter: 20px; }
  .bar__end { display: none; }
  .panel__edge { display: none; }

  /* Keep all three tracks: .bar__end is display:none here, so the third track
     stays empty and the socials remain centred on the bar, not on the gap. */
  .bar--top { padding-inline: 16px; }
  .bar--bottom { justify-content: center; }
  .email { margin-left: 0; }

  /* On a phone the panel is ~326px tall and the blurb ate two thirds of it.
     Kicker + title + button already carry the choice, so the portrait — the
     actual point of the page — gets the space back. */
  .panel__desc { display: none; }
  .socials { gap: 5px; }
  .socials a { width: 30px; height: 30px; }
  .icon { width: 14px; height: 14px; }
}

/* Fallback for engines without :has() — panels simply never swell. */
@supports not selector(:has(*)) {
  .split { grid-template-columns: 1fr 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .split { transition: none; }
}