/* =========================================================================
   Chris Messer — Personal Portfolio
   Light "warm-paper" editorial theme.
   Palette echoes the Network Science sub-site for visual continuity.
   ========================================================================= */

:root {
  /* --- Color: warm paper + prussian ink + vermilion --- */
  --paper:        #f6efdf;   /* warm-paper background            */
  --paper-2:      #fbf6ea;   /* raised surfaces / cards          */
  --paper-3:      #efe6d1;   /* recessed / hover wells           */
  --ink:          #14263f;   /* prussian-navy primary ink        */
  --ink-soft:     #3d4d66;   /* secondary text                   */
  --ink-faint:    #6b7688;   /* meta / muted                     */
  --vermilion:    #e0491b;   /* accent                           */
  --vermilion-2:  #b8380f;   /* accent, deep (hover / active)    */
  --line:         rgba(20, 38, 63, 0.14);
  --line-strong:  rgba(20, 38, 63, 0.28);
  --shadow:       rgba(20, 38, 63, 0.10);

  /* --- Type --- */
  --font-display: "Fraunces", Georgia, "Times New Roman", serif;
  --font-body:    "Newsreader", Georgia, serif;
  --font-mono:    "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  /* --- Layout --- */
  --maxw: 1120px;
  --gutter: clamp(1.25rem, 4vw, 3rem);
  --radius: 14px;
  --radius-sm: 9px;
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background-color: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: clamp(1.02rem, 0.55vw + 0.92rem, 1.18rem);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* Warm layered background: soft radial glows over paper */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(60rem 40rem at 82% -8%, rgba(224, 73, 27, 0.07), transparent 60%),
    radial-gradient(52rem 42rem at -8% 6%, rgba(20, 38, 63, 0.07), transparent 55%),
    radial-gradient(40rem 40rem at 50% 120%, rgba(20, 38, 63, 0.05), transparent 60%);
  pointer-events: none;
}

/* Fine grain overlay for paper texture */
.grain {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: 0.5;
  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='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.35'/%3E%3C/svg%3E");
}

a { color: inherit; }

::selection {
  background: var(--vermilion);
  color: var(--paper-2);
}

/* --- Skip link --- */
.skip-link {
  position: absolute;
  left: -999px;
  top: 0.5rem;
  z-index: 100;
  background: var(--ink);
  color: var(--paper-2);
  padding: 0.6rem 1rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-decoration: none;
}
.skip-link:focus { left: 0.75rem; }

/* --- Shared eyebrow --- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  margin: 0 0 1rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-soft);
}
.eyebrow__tick {
  width: 1.6rem;
  height: 2px;
  background: var(--vermilion);
  display: inline-block;
}

/* =========================================================================
   Header / Nav
   ========================================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: saturate(140%) blur(8px);
  background: color-mix(in srgb, var(--paper) 82%, transparent);
  border-bottom: 1px solid var(--line);
}
.nav {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0.9rem var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}
.brand__mark {
  display: inline-grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  border-radius: 7px;
  background: var(--ink);
  color: var(--paper-2);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}
.brand__name { color: var(--ink); }

.nav__links {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 2.4vw, 2rem);
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.04em;
}
.nav__links a {
  text-decoration: none;
  color: var(--ink-soft);
  padding-bottom: 2px;
  border-bottom: 1.5px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.nav__links a:hover { color: var(--ink); border-bottom-color: var(--vermilion); }
.nav__cta { color: var(--ink) !important; font-weight: 500; }

/* =========================================================================
   Hero
   ========================================================================= */
.hero {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(3.5rem, 9vw, 7rem) var(--gutter) clamp(2rem, 5vw, 3.5rem);
}
.hero__inner { max-width: 44ch; }

.hero__title {
  font-family: var(--font-display);
  font-optical-sizing: auto;
  font-weight: 600;
  font-size: clamp(3.4rem, 12vw, 7.5rem);
  line-height: 0.92;
  letter-spacing: -0.03em;
  margin: 0 0 1.4rem;
  color: var(--ink);
}
.hero__title-accent {
  font-style: italic;
  font-weight: 500;
  color: var(--vermilion);
}
.hero__tagline {
  font-size: clamp(1.15rem, 1.4vw, 1.5rem);
  line-height: 1.5;
  color: var(--ink-soft);
  margin: 0 0 1.75rem;
  max-width: 40ch;
}
.hero__meta {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  margin: 0 0 2.25rem;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-faint);
}
.hero__dot {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--vermilion);
}
.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
}
.hero__rule {
  max-width: var(--maxw);
  height: 1px;
  margin: clamp(2.5rem, 6vw, 4rem) auto 0;
  background: linear-gradient(90deg, var(--line-strong), transparent 70%);
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  text-decoration: none;
  padding: 0.72rem 1.25rem;
  border-radius: 999px;
  border: 1.5px solid transparent;
  transition: transform 0.18s ease, background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}
.btn--primary {
  background: var(--ink);
  color: var(--paper-2);
}
.btn--primary:hover {
  background: var(--vermilion);
  transform: translateY(-2px);
}
.btn--ghost {
  color: var(--ink);
  border-color: var(--line-strong);
  background: transparent;
}
.btn--ghost:hover {
  border-color: var(--vermilion);
  color: var(--vermilion-2);
  transform: translateY(-2px);
}

/* =========================================================================
   Section shared
   ========================================================================= */
.section-head {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(3rem, 7vw, 5rem) var(--gutter) 0;
}
.section-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(2rem, 4.5vw, 3.4rem);
  line-height: 1.02;
  letter-spacing: -0.02em;
  margin: 0 0 0.9rem;
  color: var(--ink);
}
.section-lead {
  max-width: 52ch;
  color: var(--ink-soft);
  margin: 0;
}

/* =========================================================================
   Coursework grid
   ========================================================================= */
.card-grid {
  max-width: var(--maxw);
  margin: clamp(1.75rem, 4vw, 2.75rem) auto 0;
  padding: 0 var(--gutter);
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 20rem), 1fr));
  gap: clamp(1rem, 2vw, 1.5rem);
}

.card {
  position: relative;
  display: flex;
}
.card__link {
  position: relative;
  display: flex;
  flex-direction: column;
  width: 100%;
  padding: 1.6rem 1.6rem 1.5rem;
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--ink);
  overflow: hidden;
  transition: transform 0.22s ease, border-color 0.22s ease, box-shadow 0.22s ease;
}
/* accent bar that grows on hover */
.card__link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--vermilion);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 0.28s ease;
}
a.card__link:hover,
a.card__link:focus-visible {
  transform: translateY(-4px);
  border-color: var(--line-strong);
  box-shadow: 0 18px 40px -22px var(--shadow);
}
a.card__link:hover::before,
a.card__link:focus-visible::before {
  transform: scaleY(1);
}

.card__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.1rem;
}
.card__index {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--ink-faint);
  letter-spacing: 0.1em;
}
.card__status {
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 0.28rem 0.6rem;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  color: var(--ink-faint);
}
.card__status--live {
  color: var(--vermilion-2);
  border-color: color-mix(in srgb, var(--vermilion) 45%, transparent);
  background: color-mix(in srgb, var(--vermilion) 9%, transparent);
}

.card__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.55rem;
  line-height: 1.08;
  letter-spacing: -0.01em;
  margin: 0 0 0.35rem;
}
.card__course {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  color: var(--ink-faint);
  margin: 0 0 0.9rem;
}
.card__blurb {
  font-size: 0.98rem;
  line-height: 1.55;
  color: var(--ink-soft);
  margin: 0 0 1.15rem;
}
.card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  list-style: none;
  margin: 0 0 1.35rem;
  padding: 0;
}
.card__tags li {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
  padding: 0.28rem 0.6rem;
  border-radius: 6px;
  background: var(--paper-3);
}
.card__cue {
  margin-top: auto;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.03em;
  color: var(--vermilion-2);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}
.card__cue--muted { color: var(--ink-faint); }
.card__arrow { transition: transform 0.22s ease; }
a.card__link:hover .card__arrow,
a.card__link:focus-visible .card__arrow { transform: translateX(5px); }

/* Placeholder cards */
.card--soon .card__link {
  background:
    repeating-linear-gradient(
      135deg,
      transparent 0 14px,
      color-mix(in srgb, var(--ink) 3%, transparent) 14px 15px
    ),
    var(--paper-2);
  border-style: dashed;
  border-color: var(--line-strong);
}
.card__link--static { cursor: default; }

/* =========================================================================
   About
   ========================================================================= */
.about {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(3.5rem, 8vw, 6rem) var(--gutter) clamp(2.5rem, 6vw, 4rem);
}
.about__inner { max-width: 60ch; }
.about__body {
  font-size: clamp(1.15rem, 1.3vw, 1.4rem);
  line-height: 1.62;
  color: var(--ink-soft);
  margin: 0;
}
.about__body::first-letter {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 3.1em;
  line-height: 0.72;
  float: left;
  padding: 0.08em 0.12em 0 0;
  color: var(--vermilion);
}

/* =========================================================================
   Footer
   ========================================================================= */
.site-footer {
  border-top: 1px solid var(--line);
  margin-top: clamp(2rem, 5vw, 4rem);
}
.site-footer__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 1.75rem var(--gutter);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  color: var(--ink-faint);
}
.site-footer__brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  color: var(--ink);
}
.site-footer__note { margin: 0; }
.site-footer__year { margin: 0; }

/* =========================================================================
   Motion: staggered reveal on load
   ========================================================================= */
.js-anim .reveal {
  opacity: 0;
  transform: translateY(14px);
  animation: rise 0.7s cubic-bezier(0.2, 0.7, 0.2, 1) forwards;
  animation-delay: var(--d, 0ms);
}
@keyframes rise {
  to { opacity: 1; transform: translateY(0); }
}

/* =========================================================================
   Accessibility / responsive
   ========================================================================= */
:focus-visible {
  outline: 2.5px solid var(--vermilion);
  outline-offset: 3px;
  border-radius: 3px;
}

@media (max-width: 620px) {
  .brand__name { display: none; }
  .nav__links { gap: 1rem; }
  .nav__links li:nth-child(2) { display: none; } /* hide About on small nav */
  .hero__meta { flex-wrap: wrap; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
}