/* ==========================================================================
   Wissal Bekhti — Academic website
   Design tokens
   --------------------------------------------------------------------------
   paper    #FCFCFA  page background (cool paper white)
   ink      #212730  primary text
   graphite #5C6770  meta text, captions
   petrol   #0E6E66  accent: links, rules, highlights
   petrol-soft #E7F1EF  tag / tint background
   hairline #DFE3E1  rules and borders
   --------------------------------------------------------------------------
   Type roles
   serif  "STIX Two Text"  display + body (the typeface of scientific publishing)
   sans   "IBM Plex Sans"  navigation, labels, buttons
   mono   "IBM Plex Mono"  eyebrows, dates, venues, BibTeX
   ========================================================================== */

:root {
  --paper: #fcfcfa;
  --ink: #212730;
  --graphite: #5c6770;
  --petrol: #0e6e66;
  --petrol-dark: #0a544e;
  --petrol-soft: #e7f1ef;
  --hairline: #dfe3e1;

  --serif: "STIX Two Text", "STIXGeneral", Georgia, "Times New Roman", serif;
  --sans: "IBM Plex Sans", "Helvetica Neue", Arial, sans-serif;
  --mono: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;

  --measure: 46rem;      /* main reading column */
  --wide: 62rem;         /* masthead + hero width */
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.0625rem;      /* 17px */
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* ---------- Links & focus ---------- */

a {
  color: var(--petrol);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  text-decoration-color: rgba(14, 110, 102, 0.4);
  transition: color 120ms ease, text-decoration-color 120ms ease;
}

a:hover { color: var(--petrol-dark); text-decoration-color: var(--petrol-dark); }

:focus-visible {
  outline: 2px solid var(--petrol);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ---------- Masthead ---------- */

.masthead {
  max-width: var(--wide);
  margin: 0 auto;
  padding: 1.4rem 1.5rem 1.1rem;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  border-bottom: 1px solid var(--hairline);
}

.masthead__name {
  font-family: var(--serif);
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--ink);
  text-decoration: none;
}

.masthead__name:hover { color: var(--petrol); }

.masthead__nav {
  display: flex;
  gap: 1.6rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.masthead__nav a {
  color: var(--graphite);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
}

.masthead__nav a:hover { color: var(--petrol); }

.masthead__nav a[aria-current="page"] {
  color: var(--ink);
  border-bottom-color: var(--petrol);
}

/* ---------- Layout primitives ---------- */

.page {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4rem;
}

.page--wide { max-width: var(--wide); }

.eyebrow {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--petrol);
  margin: 0 0 0.6rem;
}

h1 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(1.9rem, 4.5vw, 2.6rem);
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin: 0 0 1rem;
}

h2 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.35rem;
  margin: 2.8rem 0 0.9rem;
  padding-top: 1.4rem;
  border-top: 1px solid var(--hairline);
}

h2:first-of-type { margin-top: 1.6rem; }

h3 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.08rem;
  margin: 1.8rem 0 0.35rem;
}

p { margin: 0 0 1.05rem; }

.lede {
  font-size: 1.14rem;
  line-height: 1.6;
}

.meta {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--graphite);
  letter-spacing: 0.03em;
}

/* ---------- Hero (home) ---------- */

.hero {
  max-width: var(--wide);
  margin: 0 auto;
  padding: 3.2rem 1.5rem 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 200px;
  gap: 2.5rem;
  align-items: start;
}

.hero__title {
  font-size: clamp(2.3rem, 6vw, 3.4rem);
  margin: 0.4rem 0 0.9rem;
}

.hero__role {
  font-size: 1.16rem;
  color: var(--ink);
  margin-bottom: 0.35rem;
}

.hero__role em { font-style: italic; }

.hero__affil {
  color: var(--graphite);
  margin-bottom: 1.2rem;
}

.hero__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem 1.3rem;
  font-family: var(--sans);
  font-size: 0.88rem;
}

.hero__portrait {
  width: 200px;
  height: 200px;
  border: 1px solid var(--hairline);
  border-radius: 4px;
  overflow: hidden;
  background: var(--petrol-soft);
}

.hero__portrait img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* ---------- Signature: agent graph band ---------- */

.agent-graph {
  max-width: var(--wide);
  margin: 2.2rem auto 0;
  padding: 0 1.5rem;
}

.agent-graph svg {
  display: block;
  width: 100%;
  height: auto;
}

.agent-graph .edge {
  fill: none;
  stroke: var(--hairline);
  stroke-width: 1.1;
}

.agent-graph .edge--coop {
  stroke: var(--petrol);
  stroke-opacity: 0.75;
}

.agent-graph .node {
  fill: var(--paper);
  stroke: var(--graphite);
  stroke-width: 1.1;
}

.agent-graph .node--coop {
  fill: var(--petrol);
  stroke: var(--petrol);
}

.agent-graph .graph-caption {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  fill: var(--graphite);
}

@media (prefers-reduced-motion: no-preference) {
  .agent-graph .edge {
    stroke-dasharray: 600;
    stroke-dashoffset: 600;
    animation: draw-edge 1.6s ease-out forwards;
  }
  .agent-graph .edge--coop { animation-delay: 0.5s; }
  .agent-graph .node {
    opacity: 0;
    animation: fade-node 0.5s ease-out forwards;
    animation-delay: 0.9s;
  }
  @keyframes draw-edge { to { stroke-dashoffset: 0; } }
  @keyframes fade-node { to { opacity: 1; } }
}

/* ---------- News list ---------- */

.news { list-style: none; margin: 0; padding: 0; }

.news li {
  display: grid;
  grid-template-columns: 7.2rem 1fr;
  gap: 1.2rem;
  padding: 0.55rem 0;
  border-bottom: 1px solid var(--hairline);
}

.news li:last-child { border-bottom: none; }

.news time {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--graphite);
  padding-top: 0.25rem;
  letter-spacing: 0.03em;
}

/* ---------- Interests ---------- */

.interests {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.4rem 2rem;
}

.interests li {
  padding-left: 1.1rem;
  position: relative;
}

.interests li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 0.45rem;
  height: 1px;
  background: var(--petrol);
}

/* ---------- Publications ---------- */

.pub {
  margin: 1.6rem 0 2rem;
  padding-left: 2.6rem;
  position: relative;
}

.pub__index {
  position: absolute;
  left: 0;
  top: 0.1rem;
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--petrol);
}

.pub__title {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.12rem;
  margin: 0 0 0.3rem;
  line-height: 1.4;
}

.pub__authors { margin: 0 0 0.25rem; }

.pub__authors .self {
  font-weight: 600;
  text-decoration: underline;
  text-decoration-color: var(--petrol);
  text-decoration-thickness: 1.5px;
  text-underline-offset: 3px;
}

.pub__venue {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--graphite);
  margin: 0 0 0.6rem;
  letter-spacing: 0.02em;
}

.pub__venue .badge {
  display: inline-block;
  background: var(--petrol-soft);
  color: var(--petrol-dark);
  padding: 0.1rem 0.5rem;
  border-radius: 3px;
  margin-right: 0.5rem;
}

.pub__abstract {
  color: var(--ink);
  margin-bottom: 0.7rem;
}

.pub__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.2rem;
  font-family: var(--sans);
  font-size: 0.85rem;
}

.pub__links button {
  font-family: var(--sans);
  font-size: 0.85rem;
  color: var(--petrol);
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  text-decoration-color: rgba(14, 110, 102, 0.4);
}

.pub__links button:hover { color: var(--petrol-dark); }

.bibtex {
  display: none;
  margin-top: 0.9rem;
  position: relative;
}

.bibtex.is-open { display: block; }

.bibtex pre {
  font-family: var(--mono);
  font-size: 0.78rem;
  line-height: 1.55;
  background: #f4f6f5;
  border: 1px solid var(--hairline);
  border-radius: 4px;
  padding: 1rem 1.1rem;
  overflow-x: auto;
  margin: 0;
}

.bibtex__copy {
  position: absolute;
  top: 0.55rem;
  right: 0.55rem;
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--graphite);
  background: var(--paper);
  border: 1px solid var(--hairline);
  border-radius: 3px;
  padding: 0.25rem 0.55rem;
  cursor: pointer;
}

.bibtex__copy:hover { color: var(--petrol); border-color: var(--petrol); }

/* ---------- Project / CV entries ---------- */

.entry {
  margin: 0 0 1.7rem;
  padding-bottom: 1.7rem;
  border-bottom: 1px solid var(--hairline);
}

.entry:last-child { border-bottom: none; padding-bottom: 0; }

.entry__head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  flex-wrap: wrap;
}

.entry__title {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.08rem;
  margin: 0;
}

.entry__where {
  color: var(--graphite);
  font-size: 0.95rem;
  margin: 0.1rem 0 0.5rem;
}

.entry__body { margin: 0.4rem 0 0.6rem; }

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.5rem;
}

.tags span {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  color: var(--petrol-dark);
  background: var(--petrol-soft);
  border-radius: 3px;
  padding: 0.16rem 0.5rem;
}

/* ---------- Skill table (CV) ---------- */

.skilltable {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.98rem;
}

.skilltable th {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 500;
  color: var(--graphite);
  text-align: left;
  padding: 0.55rem 1.2rem 0.55rem 0;
  vertical-align: top;
  white-space: nowrap;
  border-bottom: 1px solid var(--hairline);
  width: 12rem;
}

.skilltable td {
  padding: 0.55rem 0;
  border-bottom: 1px solid var(--hairline);
  vertical-align: top;
}

.skilltable tr:last-child th,
.skilltable tr:last-child td { border-bottom: none; }

/* ---------- Buttons ---------- */

.btn {
  display: inline-block;
  font-family: var(--sans);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--paper);
  background: var(--petrol);
  border: 1px solid var(--petrol);
  border-radius: 4px;
  padding: 0.55rem 1.1rem;
  text-decoration: none;
  transition: background 120ms ease;
}

.btn:hover { background: var(--petrol-dark); color: var(--paper); }

.btn--ghost {
  color: var(--petrol);
  background: transparent;
}

.btn--ghost:hover { background: var(--petrol-soft); color: var(--petrol-dark); }

/* ---------- Footer ---------- */

.footer {
  max-width: var(--wide);
  margin: 0 auto;
  padding: 1.6rem 1.5rem 2.4rem;
  border-top: 1px solid var(--hairline);
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  font-family: var(--sans);
  font-size: 0.83rem;
  color: var(--graphite);
}

.footer a { color: var(--graphite); }
.footer a:hover { color: var(--petrol); }

.footer__links { display: flex; gap: 1.2rem; flex-wrap: wrap; }

/* ---------- Responsive ---------- */

@media (max-width: 700px) {
  .hero {
    grid-template-columns: 1fr;
    padding-top: 2.2rem;
  }
  .hero__portrait { order: -1; width: 150px; height: 150px; }
  .interests { grid-template-columns: 1fr; }
  .news li { grid-template-columns: 1fr; gap: 0.1rem; }
  .masthead { padding-top: 1.1rem; }
  .masthead__nav { gap: 1.05rem; }
}