/* ============================================
   Asad L. Asad — v2
   Dark, editorial, typographic
   ============================================ */

:root {
  --bg:          #faf7f1;
  --bg-elevated: #f1ece1;
  --bg-section:  #f5f1e6;
  --text:        #2b2a28;
  --text-bright: #121110;
  --text-dim:    #6b6a66;
  --accent:      #8C1515;
  --accent-dim:  #8C151522;
  --accent-light:#8C151518;
  --border:      #d9d2c2;
  --font:        'Space Grotesk', -apple-system, system-ui, sans-serif;
  --max-width:   920px;
  --nav-height:  56px;
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

html {
  font-size: 17px;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-height) + 2rem);
}

body {
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  border-top: 3px solid var(--accent);
}

::selection {
  background: var(--accent-dim);
  color: var(--text-bright);
}

a { color: var(--accent); text-decoration: none; transition: opacity 0.2s; }
a:hover { opacity: 0.8; }

/* ---- NAV ---- */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 2rem;
  backdrop-filter: blur(12px);
  background: rgba(250, 247, 241, 0.92);
}

.nav-name {
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--text-bright);
  text-decoration: none;
  margin-right: auto;
}

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-links a {
  font-size: 0.82rem;
  font-weight: 400;
  color: var(--text-dim);
  text-decoration: none;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--accent);
  opacity: 1;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  width: 24px;
  height: 20px;
  position: relative;
}
.nav-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text-dim);
  position: absolute;
  left: 0;
  transition: 0.2s;
}
.nav-toggle span:first-child { top: 4px; }
.nav-toggle span:last-child { bottom: 4px; }

/* ---- LAYOUT ---- */
.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

section {
  padding: 5rem 0;
  border-bottom: 1px solid var(--border);
}

section:last-of-type {
  border-bottom: none;
}

.section-label {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin-bottom: 1.5rem;
}

.section-lead {
  font-size: 1.05rem;
  color: var(--text);
  line-height: 1.8;
  max-width: 640px;
  margin-bottom: 3rem;
}

/* ---- HERO ---- */
header {
  padding: 6rem 0 5rem;
  border-bottom: 1px solid var(--border);
}

.hero-content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
  display: grid;
  grid-template-columns: 1fr 240px;
  gap: 4rem;
  align-items: start;
}

.hero-text h1 {
  font-size: 2.8rem;
  font-weight: 300;
  letter-spacing: -0.02em;
  color: var(--accent);
  line-height: 1.15;
  margin-bottom: 0.8rem;
}

.role {
  font-size: 0.95rem;
  color: var(--text-dim);
  font-weight: 400;
  margin-bottom: 1.8rem;
  line-height: 1.6;
}

.statement {
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--text);
  margin-bottom: 2rem;
  max-width: 560px;
}

.hero-actions {
  display: flex;
  gap: 0.8rem;
}

.btn {
  display: inline-block;
  padding: 0.55rem 1.3rem;
  font-family: var(--font);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  border-radius: 4px;
  transition: all 0.2s;
  text-decoration: none;
}

.btn:not(.btn-ghost) {
  background: var(--accent);
  color: var(--bg);
}
.btn:not(.btn-ghost):hover {
  opacity: 0.9;
}

.btn-ghost {
  border: 1px solid var(--border);
  color: var(--text-dim);
  background: transparent;
}
.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
  opacity: 1;
}

.hero-image img {
  width: 460px;
  height: 305px;
  object-fit: cover;
  object-position: center 70%;
  border-radius: 4px;
  filter: grayscale(15%);
  background: var(--bg-elevated);
}

/* ---- RESEARCH ---- */
#research {
  background: var(--bg-section);
}

/* project spacing now handled by .project.collapsible above */

.project h2 {
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 0.6rem;
  letter-spacing: -0.01em;
}

.project-desc {
  font-size: 0.92rem;
  color: var(--text);
  line-height: 1.8;
  max-width: 640px;
  margin-bottom: 1.5rem;
}

.pub-list {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.pub {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  padding-left: 1rem;
  border-left: 2px solid #8C151540;
  transition: border-color 0.2s;
}

.pub:hover {
  border-left-color: var(--accent);
}

.pub-title {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-bright);
  line-height: 1.5;
}

.pub-link {
  text-decoration: none;
  color: inherit;
}

.pub-link .pub-title {
  transition: color 0.2s;
}

.pub-link:hover .pub-title {
  color: var(--accent);
  opacity: 1;
}

.pub-venue {
  font-size: 0.82rem;
  color: var(--text-dim);
}

.pub-award {
  font-size: 0.78rem;
  color: var(--accent);
  font-weight: 500;
}

/* ---- PUBLICATIONS ---- */
.book-section {
  background: var(--bg);
}

.pub-group-heading {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--text-bright);
  letter-spacing: -0.01em;
  margin-bottom: 2rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--border);
}

.pub-list-flat {
  gap: 1.2rem;
}

.pub-list-flat .pub-hidden {
  display: none;
}

.pub-toggles {
  display: flex;
  gap: 0.6rem;
  margin-top: 1.8rem;
  flex-wrap: wrap;
}

.pub-toggle {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-dim);
  font-family: var(--font);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  padding: 0.55rem 1.3rem;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s;
}

.pub-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.book-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 3.5rem;
  align-items: start;
}

.book-cover img {
  width: 220px;
  border-radius: 3px;
  box-shadow: 0 8px 30px rgba(60, 50, 30, 0.12);
  background: var(--bg-elevated);
}

.book-info h2 {
  font-size: 1.6rem;
  font-weight: 600;
  color: var(--text-bright);
  margin-bottom: 0.3rem;
  letter-spacing: -0.01em;
}

.book-subtitle {
  font-size: 1rem;
  color: var(--text);
  margin-bottom: 0.5rem;
  font-weight: 400;
}

.book-publisher {
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 1.5rem;
}

.book-desc {
  font-size: 0.92rem;
  color: var(--text);
  line-height: 1.8;
  margin-bottom: 2rem;
  max-width: 560px;
}

.book-awards {
  margin-bottom: 2rem;
}

.book-awards h3 {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin-bottom: 0.8rem;
}

.book-awards p {
  font-size: 0.85rem;
  color: var(--text-dim);
  line-height: 1.9;
  padding-left: 0;
}

.book-links {
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
}

.book-cover .book-links {
  flex-direction: column;
  gap: 0.5rem;
  margin-top: 1rem;
}

.book-cover .book-links .btn {
  text-align: center;
  width: 100%;
  font-size: 0.78rem;
  padding: 0.5rem 0.8rem;
}

.book-quotes {
  margin-top: 4rem;
  padding: 3rem 1rem;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  min-height: 260px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.book-quote {
  max-width: 680px;
  margin: 0 auto;
  text-align: center;
  transition: opacity 0.5s ease;
}

.book-quote.fading {
  opacity: 0;
}

.quote-text {
  font-size: 1.1rem;
  font-style: italic;
  line-height: 1.6;
  color: var(--text);
  margin-bottom: 1rem;
}

.quote-attr {
  font-size: 0.82rem;
  font-style: normal;
  color: var(--text-dim);
  display: block;
  letter-spacing: 0.01em;
}

.book-quotes--inline {
  margin-top: 2rem;
  padding: 1.2rem 0 0;
  border-top: 1px solid var(--border);
  border-bottom: none;
  min-height: 160px;
  align-items: flex-start;
  justify-content: flex-start;
}

.book-quotes--inline .book-quote {
  text-align: left;
  max-width: 100%;
  margin: 0;
}

.book-quotes--inline .quote-text {
  font-size: 0.95rem;
  line-height: 1.55;
  margin-bottom: 0.7rem;
}

.book-quotes--inline .quote-attr {
  font-size: 0.76rem;
}

/* ---- BIOGRAPHY ---- */
#biography {
  background: var(--bg-section);
}

/* ---- COLLAPSIBLE ---- */
.collapsible {
  border: none;
}

.collapsible-toggle {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  position: relative;
}

.collapsible-toggle::-webkit-details-marker {
  display: none;
}

.collapsible-toggle::after {
  content: "+";
  font-size: 1.1rem;
  font-weight: 300;
  color: var(--accent);
  flex-shrink: 0;
  transition: transform 0.2s;
  margin-left: auto;
}

.collapsible[open] > .collapsible-toggle::after {
  content: "\2212";
}

#biography .collapsible-toggle {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--accent);
  padding: 0.3rem 0;
}

.bio-toggle {
  background: transparent;
  border: none;
  cursor: pointer;
  font-family: var(--font);
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--accent);
  padding: 0.3rem 0;
  margin-top: 1rem;
  transition: opacity 0.2s;
}

.bio-toggle:hover {
  opacity: 0.8;
}

.bio-toggle::after {
  content: " +";
  font-weight: 300;
}

.bio-toggle.open::after {
  content: " \2212";
}

.project.collapsible {
  margin-bottom: 3.5rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid var(--border);
}

.project.collapsible:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.project .collapsible-toggle {
  flex-wrap: wrap;
}

.project .collapsible-toggle h2 {
  margin-bottom: 0;
}

.book-info .collapsible-toggle {
  flex-direction: column;
  align-items: flex-start;
}

.book-info .collapsible-toggle::after {
  position: absolute;
  right: 0;
  top: 0.3rem;
}

.bio-prose {
  max-width: 640px;
  margin-top: 1rem;
}

.bio-prose p {
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--text);
  margin-bottom: 1.4rem;
}

.bio-prose p:last-child {
  margin-bottom: 0;
}

/* ---- TEACHING (legacy; unused) ---- */
#teaching {
  background: var(--bg-section);
}

.courses {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.course h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-bright);
  margin-bottom: 0.3rem;
}

.course p {
  font-size: 0.88rem;
  color: var(--text);
  line-height: 1.7;
  max-width: 580px;
}

.advising h3 {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin-bottom: 0.8rem;
}

.advising p {
  font-size: 0.88rem;
  color: var(--text-dim);
}

/* ---- FOOTER ---- */
footer {
  padding: 3rem 0;
  border-top: 2px solid var(--accent);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: start;
}

.footer-name {
  font-weight: 600;
  color: var(--text-bright);
  margin-bottom: 0.3rem;
  font-size: 0.9rem;
}

footer p {
  font-size: 0.82rem;
  color: var(--text-dim);
  line-height: 1.6;
}

.footer-links {
  display: flex;
  gap: 1.5rem;
}

.footer-links a {
  font-size: 0.82rem;
  color: var(--text-dim);
  text-decoration: none;
  transition: color 0.2s;
}

.footer-links a:hover {
  color: var(--accent);
}

/* ---- RESPONSIVE ---- */
@media (max-width: 768px) {
  html { font-size: 16px; }

  .nav-links {
    display: none;
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 1rem 2rem;
    gap: 0.5rem;
  }

  .nav-links.open { display: flex; }

  .nav-links a {
    padding: 0.5rem 0;
    font-size: 0.9rem;
  }

  .nav-toggle { display: block; }

  header { padding: 3rem 0; }

  .hero-content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .hero-text h1 { font-size: 2rem; }

  .hero-image { order: -1; }
  .hero-image img {
    width: 240px;
    height: 160px;
  }

  .book-layout {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .book-cover img { width: 160px; }

  .footer-content {
    flex-direction: column;
    gap: 1.5rem;
  }

  section { padding: 3rem 0; }
}