/* ============================================================
   Bassam El Rawas — personal site
   Warm, minimal, personal. Light + dark aware.
   ============================================================ */

:root {
  /* Blue light palette (from #091540 #7692ff #abd2fa #3d518c #1b2cc1) */
  --bg:        #f3f6ff;
  --surface:   #ffffff;
  --text:      #091540;   /* deep navy   */
  --muted:     #64748b;   /* neutral gray (navbar + secondary text) */
  --border:    #d5e2f7;
  --accent:    #2f4bc4;   /* blue (darker) */
  --accent-2:  #5a72e6;   /* deeper periwinkle */
  --accent-soft: #dfe8ff;
  --shadow:    0 1px 2px rgba(9, 21, 64, .05), 0 8px 24px rgba(9, 21, 64, .08);
  /* overlay laid over the background image to keep text readable */
  --bg-overlay: rgba(243, 246, 255, .62);

  --maxw: 1040px;
  --radius: 14px;
  --font-sans: "Crimson Text", Georgia, "Times New Roman", serif;
  --font-serif: "Crimson Text", Georgia, "Times New Roman", serif;
}

:root[data-theme="dark"] {
  --bg:        #1a1714;
  --surface:   #221e1a;
  --text:      #ece5db;
  --muted:     #a99e91;
  --border:    #362f28;
  --accent:    #9fb3ff;
  --accent-2:  #c9e2ff;
  --accent-soft: #2c241d;
  --shadow:    0 1px 2px rgba(0,0,0,.2), 0 10px 30px rgba(0,0,0,.35);
  --bg-overlay: rgba(26, 23, 20, .90);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg:        #1a1714;
    --surface:   #221e1a;
    --text:      #ece5db;
    --muted:     #a99e91;
    --border:    #362f28;
    --accent:    #9fb3ff;
    --accent-2:  #c9e2ff;
    --accent-soft: #2c241d;
    --shadow:    0 1px 2px rgba(0,0,0,.2), 0 10px 30px rgba(0,0,0,.35);
    --bg-overlay: rgba(26, 23, 20, .78);
  }
}

/* ---------- base ---------- */
* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 80px; }

body {
  margin: 0;
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 19px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  /* full-bleed fixed background; the image (assets/good1.jpg … good10.jpg) is chosen
     at random on each load by the inline script in index.html. Fallback = --bg color. */
  background-color: var(--bg);
  background-position: center;
  background-size: cover;
  background-repeat: no-repeat;
  background-attachment: fixed;
}

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

h1, h2, h3 { font-family: var(--font-serif); font-weight: 700; line-height: 1.2; }

em { color: var(--muted); font-style: italic; }

/* ---------- navbar ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--surface) 95%, transparent);
  backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav__brand {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.15rem;
  color: var(--text);
}
.nav__brand:hover { text-decoration: none; color: var(--accent); }

.nav__links {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 22px;
  margin: 0;
  padding: 0;
}
.nav__links a {
  color: var(--muted);
  font-weight: 500;
  font-size: .95rem;
}
.nav__links a:hover { color: var(--accent); text-decoration: none; }

.theme-toggle {
  display: grid;
  place-items: center;
  width: 34px; height: 34px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  border-radius: 9px;
  cursor: pointer;
  transition: border-color .2s, color .2s;
}
.theme-toggle:hover { color: var(--accent); border-color: var(--accent); }
.icon-moon { display: none; }
:root[data-theme="dark"] .icon-sun { display: none; }
:root[data-theme="dark"] .icon-moon { display: block; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .icon-sun { display: none; }
  :root:not([data-theme="light"]) .icon-moon { display: block; }
}

/* hamburger */
.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: 0;
  cursor: pointer;
  padding: 6px;
}
.nav__toggle span {
  width: 24px; height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform .25s, opacity .25s;
}

/* ---------- layout: the floating content box ---------- */
main {
  max-width: var(--maxw);
  margin: 44px auto;
  padding: 8px 48px 44px;
  background: color-mix(in srgb, var(--surface) 95%, transparent);
  backdrop-filter: saturate(120%) blur(8px);
  border: 1px solid var(--border);
  border-radius: 20px;
  box-shadow: 0 10px 40px rgba(9, 21, 64, .18);
}

.section { padding: 40px 0 0; }
.section + .section,
.hero + .section { border-top: 1px solid var(--border); }
/* .section--alt no longer draws a full-bleed band inside the box */
.section--alt { background: transparent; margin: 0; }

.section__title {
  font-size: 1.9rem;
  margin: 0 0 6px;
  position: relative;
  padding-bottom: 10px;
}
.section__title::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 46px; height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  border-radius: 3px;
}
.section__intro { color: var(--muted); margin-top: 18px; }

/* ---------- hero ---------- */
.hero {
  display: grid;
  grid-template-columns: 190px 1fr;
  gap: 40px;
  align-items: center;
  padding: 32px 0 40px;
}
.hero__photo img {
  width: 190px; height: 190px;
  object-fit: cover;
  border-radius: 50%;
  border: 4px solid var(--surface);
  box-shadow: var(--shadow);
  background: var(--accent-soft);
}
.hero__text h1 {
  font-size: 2.6rem;
  margin: 0 0 6px;
  letter-spacing: -0.01em;
}
.hero__role {
  margin: 0 0 4px;
  color: var(--accent);
  font-weight: 600;
}
.hero__affil {
  display: flex; align-items: center; gap: 7px;
  color: var(--muted);
  font-size: .95rem;
  margin: 0 0 18px;
}
.lead { margin: 0 0 18px; }

.edu-list {
  list-style: none;
  padding: 0;
  margin: 0 0 24px;
  display: grid;
  gap: 7px;
}
.edu-list li {
  position: relative;
  padding-left: 18px;
  font-size: .95rem;
}
.edu-list li::before {
  content: "";
  position: absolute;
  left: 2px; top: .62em;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
}
.edu-year {
  display: inline-block;
  min-width: 118px;
  color: var(--muted);
  font-weight: 500;
}

.hero__links { display: flex; flex-wrap: wrap; gap: 10px; }
.hero__email { margin: 16px 0 0; color: var(--muted); font-size: .92rem; }
.btn {
  display: inline-block;
  padding: 8px 16px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--text);
  font-size: .92rem;
  font-weight: 500;
  transition: transform .15s, border-color .2s, color .2s, background .2s;
}
.btn:hover { text-decoration: none; border-color: var(--accent); color: var(--accent); transform: translateY(-1px); }
.btn--primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.btn--primary:hover { background: var(--accent-2); border-color: var(--accent-2); color: #fff; }

/* ---------- publications (minimal text list) ---------- */
.pub-list { list-style: none; padding: 0; margin: 18px 0 0; display: grid; gap: 16px; }
.pub__title { font-size: 1.15rem; margin: 0 0 1px; font-weight: 600; line-height: 1.35; }
.pub__authors { margin: 0; font-size: 1.02rem; }
.pub__venue { margin: 0; color: var(--muted); font-size: 1rem; }
.pub__venue em { font-style: italic; }
.pub__links { margin-top: 1px; font-size: .98rem; }
.pub__links a { font-weight: 500; }
.pub__links .sep { color: var(--border); margin: 0 8px; }

/* ---------- teaching ---------- */
.teach-list { list-style: none; padding: 0; margin: 18px 0 0; display: grid; gap: 0; }
.teach {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 20px;
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
}
.teach:last-child { border-bottom: 0; }
.teach__term {
  font-weight: 600;
  color: var(--accent);
  font-size: 1rem;
  padding-top: 1px;
}
.teach__body h3 { margin: 0 0 2px; font-size: 1.15rem; }
.teach__body h3 a { color: var(--text); text-decoration: none; }
.teach__body h3 a:hover { text-decoration: underline; text-decoration-color: var(--accent); }
.teach__body p { margin: 0; color: var(--muted); font-size: 1rem; line-height: 1.55; }

/* ---------- footer ---------- */
.footer {
  margin-top: 40px;
  padding-top: 22px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  color: var(--muted);
  font-size: .88rem;
}
.footer p { margin: 0; }
.footer a { color: var(--muted); }
.footer a:hover { color: var(--accent); }

/* ---------- responsive ---------- */
@media (max-width: 680px) {
  .nav__toggle { display: flex; }
  .nav__links {
    position: absolute;
    top: 100%; left: 0; right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 14px 24px 20px;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    pointer-events: none;
    transition: max-height .28s ease, opacity .2s;
  }
  .nav__links.is-open { max-height: 340px; opacity: 1; pointer-events: auto; }

  .hero {
    grid-template-columns: 1fr;
    text-align: center;
    justify-items: center;
    gap: 22px;
    padding-top: 40px;
  }
  .hero__affil { justify-content: center; }
  .hero__links { justify-content: center; }
  .hero__text h1 { font-size: 2.1rem; }

  main { margin: 20px 12px; padding: 4px 22px 32px; border-radius: 16px; }
  .teach { grid-template-columns: 1fr; }
  .teach__term { padding-top: 0; }
}

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; transition: none !important; }
}