/* Youssef Elhagrasy — site styles. Simple researcher layout, light/dark aware. */

:root {
  --bg: #ffffff;
  --bg-soft: #f6f7f9;
  --text: #1f2328;
  --muted: #5b6470;
  --border: #e4e7eb;
  --accent: #2455a4;
  --accent-soft: rgba(36, 85, 164, 0.08);
  --good: #1a7f4b;
  --good-soft: rgba(26, 127, 75, 0.08);
  --warn: #9a6700;
  --code-bg: #f3f4f6;
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.04), 0 1px 3px rgba(16, 24, 40, 0.06);
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #111418;
    --bg-soft: #181c21;
    --text: #e6e8eb;
    --muted: #9aa4b0;
    --border: #2a3038;
    --accent: #7fb0ff;
    --accent-soft: rgba(127, 176, 255, 0.10);
    --good: #6fd19c;
    --good-soft: rgba(111, 209, 156, 0.10);
    --warn: #e3b341;
    --code-bg: #1b2027;
    --shadow: none;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #111418;
  --bg-soft: #181c21;
  --text: #e6e8eb;
  --muted: #9aa4b0;
  --border: #2a3038;
  --accent: #7fb0ff;
  --accent-soft: rgba(127, 176, 255, 0.10);
  --good: #6fd19c;
  --good-soft: rgba(111, 209, 156, 0.10);
  --warn: #e3b341;
  --code-bg: #1b2027;
  --shadow: none;
  color-scheme: dark;
}

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

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 16.5px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  transition: background-color .2s ease, color .2s ease;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

img { max-width: 100%; height: auto; }

h1, h2, h3, h4 { line-height: 1.25; font-weight: 600; letter-spacing: -0.01em; }
h1 { font-size: 2.1rem; margin: 0 0 .4rem; }
h2 { font-size: 1.45rem; margin: 2.4rem 0 .8rem; }
h3 { font-size: 1.12rem; margin: 1.8rem 0 .5rem; }
p { margin: 0 0 1rem; }
ul, ol { padding-left: 1.3rem; }
li { margin: .25rem 0; }
hr { border: 0; border-top: 1px solid var(--border); margin: 2.5rem 0; }

code, pre, .mono { font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
code { font-size: .86em; background: var(--code-bg); padding: .1em .35em; border-radius: 4px; }
pre, .mono-block {
  font-size: .82rem; line-height: 1.55; overflow-x: auto;
  background: var(--code-bg); border: 1px solid var(--border);
  border-radius: 8px; padding: 1rem 1.1rem; margin: 1.2rem 0;
}
pre code, .mono-block code { background: none; padding: 0; font-size: inherit; }

/* ---------- layout ---------- */

.container { max-width: 860px; margin: 0 auto; padding: 0 20px; }

.site-header {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(160%) blur(8px);
  -webkit-backdrop-filter: saturate(160%) blur(8px);
  border-bottom: 1px solid var(--border);
}
.site-header .container {
  display: flex; align-items: center; justify-content: space-between;
  height: 58px; gap: 1rem;
}
.brand { font-weight: 600; color: var(--text); letter-spacing: -0.01em; white-space: nowrap; }
.brand:hover { text-decoration: none; color: var(--accent); }

.site-nav { display: flex; align-items: center; gap: 1.3rem; }
.site-nav a { color: var(--muted); font-size: .95rem; }
.site-nav a:hover { color: var(--text); text-decoration: none; }
.site-nav a.active { color: var(--accent); }

.icon-btn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 34px; height: 34px; border-radius: 8px;
  border: 1px solid transparent; background: none; color: var(--muted); cursor: pointer;
}
.icon-btn:hover { color: var(--text); border-color: var(--border); }
.icon-btn svg { width: 18px; height: 18px; }
.theme-toggle .sun { display: none; }
:root[data-theme="dark"] .theme-toggle .sun { display: block; }
:root[data-theme="dark"] .theme-toggle .moon { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .sun { display: block; }
  :root:not([data-theme="light"]) .theme-toggle .moon { display: none; }
}
.menu-toggle { display: none; }

@media (max-width: 680px) {
  .menu-toggle { display: inline-flex; }
  .site-nav {
    display: none; position: absolute; top: 58px; left: 0; right: 0;
    flex-direction: column; align-items: flex-start; gap: .2rem;
    background: var(--bg); border-bottom: 1px solid var(--border); padding: .6rem 20px 1rem;
  }
  .site-nav.open { display: flex; }
  .site-nav a { padding: .35rem 0; font-size: 1rem; }
  .site-nav .theme-toggle { margin-top: .3rem; }
}

main { padding: 2.8rem 0 3rem; }

.site-footer {
  border-top: 1px solid var(--border);
  color: var(--muted); font-size: .85rem;
  padding: 1.6rem 0 2.2rem;
}
.site-footer .container { display: flex; justify-content: space-between; flex-wrap: wrap; gap: .6rem; }
.site-footer a { color: var(--muted); }
.site-footer a:hover { color: var(--text); }

/* ---------- home ---------- */

.hero { display: grid; grid-template-columns: 1fr 210px; gap: 2.4rem; align-items: start; }
.hero .subtitle { color: var(--muted); margin-bottom: 1.3rem; font-size: 1rem; }
.hero .portrait {
  width: 210px; aspect-ratio: 4 / 5; object-fit: cover; object-position: center 25%;
  border-radius: 12px; border: 1px solid var(--border); box-shadow: var(--shadow);
}
.links-row { display: flex; flex-wrap: wrap; gap: .5rem 1.1rem; margin-top: 1.2rem; font-size: .95rem; }
.links-row a { display: inline-flex; align-items: center; gap: .4rem; }
.links-row svg { width: 16px; height: 16px; }

@media (max-width: 680px) {
  h1 { font-size: 1.75rem; }
  .hero { grid-template-columns: 1fr; gap: 1.4rem; }
  .hero .portrait-wrap { order: -1; }
  .hero .portrait { width: 150px; }
}

.section-title {
  font-size: 1.3rem; margin: 3rem 0 1rem; padding-bottom: .45rem;
  border-bottom: 1px solid var(--border);
}

.news { list-style: none; padding: 0; margin: 0; }
.news li { display: grid; grid-template-columns: 92px 1fr; gap: 1rem; padding: .4rem 0; margin: 0; }
.news .date { color: var(--muted); font-size: .9rem; font-variant-numeric: tabular-nums; padding-top: .05rem; }
@media (max-width: 520px) { .news li { grid-template-columns: 1fr; gap: 0; } }

.interests { padding-left: 1.1rem; }
.interests li { margin: .35rem 0; }

/* publications */
.pubs { list-style: none; padding: 0; margin: 0; }
.pub { padding: 1rem 0; border-bottom: 1px solid var(--border); margin: 0; }
.pub:last-child { border-bottom: 0; }
.pub-title { font-weight: 600; color: var(--text); display: block; margin-bottom: .2rem; line-height: 1.4; }
.pub-authors { color: var(--muted); font-size: .93rem; }
.pub-authors .me { color: var(--text); font-weight: 600; }
.pub-venue { font-size: .93rem; font-style: italic; }
.pub-meta { display: flex; flex-wrap: wrap; align-items: center; gap: .4rem .6rem; margin-top: .45rem; }

.badge {
  display: inline-block; font-size: .72rem; font-weight: 600; letter-spacing: .02em;
  padding: .12rem .5rem; border-radius: 999px; border: 1px solid var(--border); color: var(--muted);
  white-space: nowrap; font-style: normal;
}
.badge.accepted, .badge.published { color: var(--good); border-color: color-mix(in srgb, var(--good) 40%, transparent); background: var(--good-soft); }
.badge.review { color: var(--warn); border-color: color-mix(in srgb, var(--warn) 40%, transparent); }
.pill-link { font-size: .8rem; padding: .12rem .55rem; border: 1px solid var(--border); border-radius: 6px; color: var(--muted); }
.pill-link:hover { color: var(--accent); border-color: var(--accent); text-decoration: none; }

/* current research */
.research-list { display: grid; gap: 1rem; }
.research-item {
  border: 1px solid var(--border); border-radius: 10px; padding: 1rem 1.2rem;
  background: var(--bg-soft);
}
.research-item h3 { margin: 0 0 .15rem; font-size: 1.02rem; }
.research-item .where { color: var(--muted); font-size: .88rem; margin-bottom: .5rem; }
.research-item p { margin: 0; font-size: .95rem; }

/* ---------- projects ---------- */

.project-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.2rem; margin-top: 1.5rem; }
@media (max-width: 680px) { .project-grid { grid-template-columns: 1fr; } }

.project-card {
  display: flex; flex-direction: column; border: 1px solid var(--border); border-radius: 12px;
  overflow: hidden; background: var(--bg); color: var(--text); box-shadow: var(--shadow);
  transition: transform .15s ease, border-color .15s ease;
}
a.project-card:hover { text-decoration: none; border-color: var(--accent); transform: translateY(-2px); }
.project-card .thumb { aspect-ratio: 16 / 9; background: var(--bg-soft); border-bottom: 1px solid var(--border); overflow: hidden; }
.project-card .thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.project-card .thumb.contain img { object-fit: contain; padding: .6rem; background: #fff; }
.project-card .body { padding: 1rem 1.1rem 1.15rem; display: flex; flex-direction: column; gap: .4rem; flex: 1; }
.project-card h3 { margin: 0; font-size: 1.05rem; }
.project-card p { margin: 0; font-size: .92rem; color: var(--muted); }
.project-card .tags { display: flex; flex-wrap: wrap; gap: .35rem; margin-top: auto; padding-top: .5rem; }

.page-intro { color: var(--muted); max-width: 640px; }

/* ---------- article pages (projects, blog) ---------- */

.post header.major { margin-bottom: 1.6rem; }
.post header.major h1 br { display: none; }
.post header.major p { color: var(--muted); font-size: 1.02rem; }
.back-link { display: inline-block; font-size: .9rem; margin-bottom: 1.2rem; color: var(--muted); }
.back-link:hover { color: var(--accent); }

.image { display: block; }
.image.main, .image.fit, figure { margin: 1.6rem 0; }
.image.main img, .image.fit img, figure img { width: 100%; display: block; border-radius: 8px; }
figure figcaption { color: var(--muted); font-size: .88rem; margin-top: .5rem; text-align: center; }
figure.narrow { max-width: 460px; margin-left: auto; margin-right: auto; }
figure.white img { background: #fff; border: 1px solid var(--border); padding: .4rem; }

.row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin: 1rem 0; }
.row > [class*="col-"] { min-width: 0; }
@media (max-width: 600px) { .row { grid-template-columns: 1fr; } }

.gif-container, .video-container { display: flex; justify-content: center; margin: 1.6rem 0; }
.gif-container img { width: 100%; max-width: 560px; border-radius: 8px; }
.video-container iframe { width: 100%; max-width: 720px; aspect-ratio: 16 / 9; height: auto; border: 0; border-radius: 8px; }

ul.actions { list-style: none; padding: 0; display: flex; flex-wrap: wrap; gap: .6rem; margin: 1.2rem 0; }
ul.actions li { margin: 0; }
.button, .btn {
  display: inline-flex; align-items: center; gap: .4rem;
  padding: .5rem 1rem; border-radius: 8px; font-size: .92rem; font-weight: 500;
  border: 1px solid var(--border); color: var(--text); background: var(--bg);
}
.button:hover, .btn:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--bg); }
.btn.primary:hover { opacity: .9; color: var(--bg); }

.table-wrapper { overflow-x: auto; margin: 1.4rem 0; }
table { width: 100%; border-collapse: collapse; font-size: .9rem; }
th, td { text-align: left; padding: .5rem .7rem; border-bottom: 1px solid var(--border); vertical-align: top; }
thead th { font-weight: 600; color: var(--muted); border-bottom-width: 2px; }
.result-table td { font-family: "JetBrains Mono", ui-monospace, Menlo, monospace; font-size: .85rem; }

.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: .8rem; margin: 1.6rem 0; }
.stat { border: 1px solid var(--border); border-radius: 10px; padding: .8rem 1rem; background: var(--bg-soft); }
.stat .v { font-size: 1.35rem; font-weight: 600; font-variant-numeric: tabular-nums; }
.stat .l { color: var(--muted); font-size: .83rem; }

/* callouts + blog bits (shared by Attention Accelerator + Blog) */
.callout { padding: .9rem 1.15rem; border-radius: 0 8px 8px 0; margin: 1.6rem 0; }
.callout .k { display: block; font-family: "JetBrains Mono", ui-monospace, Menlo, monospace; font-size: .7rem; letter-spacing: .14em; text-transform: uppercase; margin-bottom: .35rem; }
.callout p { margin: 0; }
.callout.idea { border-left: 3px solid var(--accent); background: var(--accent-soft); }
.callout.idea .k { color: var(--accent); }
.callout.take { border-left: 3px solid var(--good); background: var(--good-soft); }
.callout.take .k { color: var(--good); }

.entry-date { display: inline-block; font-family: "JetBrains Mono", ui-monospace, Menlo, monospace; font-size: .78rem; letter-spacing: .1em; color: var(--muted); margin-bottom: .3rem; }
.tag { display: inline-block; font-size: .72rem; padding: .1rem .55rem; border: 1px solid var(--border); border-radius: 999px; margin-left: .5rem; vertical-align: middle; color: var(--muted); }
.project-card .tag { margin-left: 0; }
.tag.done { color: var(--good); border-color: color-mix(in srgb, var(--good) 40%, transparent); }
.tag.wip { color: var(--warn); border-color: color-mix(in srgb, var(--warn) 40%, transparent); }
.tbd { font-family: "JetBrains Mono", ui-monospace, Menlo, monospace; font-size: .85em; color: var(--warn); }
.post article h2 { margin-top: .4rem; }
hr.entry-sep { margin: 3.2rem 0; }

/* CV page */
.cv-frame { width: 100%; height: 125vh; border: 1px solid var(--border); border-radius: 10px; background: var(--bg-soft); }
@media (max-width: 680px) { .cv-frame { height: 80vh; } }
.project-card .thumb.figure img { object-fit: contain; background: #0b0f1a; padding: .5rem; }