/* ==========================================================================
   Isaac I. Hacamo — Personal Website
   Modern Academic Minimal
   ========================================================================== */

:root {
  --bg: #ffffff;
  --bg-alt: #f5f4f0;
  --surface: #ffffff;
  --ink: #1a1a1a;
  --ink-muted: #4a4a4a;
  --ink-soft: #6b6b6b;
  --rule: #d9d6cc;
  --rule-soft: #ece9df;
  --accent: #3a4754;
  --accent-soft: #5a6878;
  --accent-bg: #eaecef;
  --shadow-sm: 0 1px 2px rgba(20, 20, 20, 0.04);
  --shadow-md: 0 8px 24px rgba(20, 20, 20, 0.06);
  --serif: 'Newsreader', 'Source Serif 4', 'Iowan Old Style', 'Apple Garamond', Georgia, serif;
  --sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  --max-width: 1080px;
}

/* Reset & base */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.65;
  font-weight: 400;
  -webkit-text-size-adjust: 100%;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-decoration: none; transition: color .2s ease; }
a:hover { color: var(--ink); }
strong, b { font-weight: 600; color: var(--ink); }

/* Headings */
h1, h2, h3, h4 {
  font-family: var(--serif);
  color: var(--ink);
  font-weight: 500;
  letter-spacing: -0.01em;
  line-height: 1.2;
  margin: 0 0 0.6em 0;
}
h1 { font-size: clamp(2rem, 4.4vw, 3.2rem); font-weight: 500; letter-spacing: -0.02em; }
h2 { font-size: clamp(1.5rem, 2.6vw, 2rem); margin-top: 2.5em; }
h3 { font-size: 1.2rem; font-weight: 600; }

p { margin: 0 0 1em 0; }
hr { border: 0; border-top: 1px solid var(--rule); margin: 3rem 0; }

/* Layout */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 28px;
}

/* ==========================================================================
   HEADER / NAV
   ========================================================================== */
.site-header {
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--rule-soft);
  position: sticky;
  top: 0;
  z-index: 100;
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  padding-top: 14px;
  padding-bottom: 14px;
}
.brand {
  font-family: var(--serif);
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.brand:hover { color: var(--accent); }
.brand .brand-mark {
  display: inline-block;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--bg);
  text-align: center;
  line-height: 28px;
  font-family: var(--sans);
  font-size: 0.78rem;
  font-weight: 600;
  margin-right: 10px;
  vertical-align: middle;
  letter-spacing: 0;
}
nav.primary-nav {
  display: flex;
  gap: 32px;
  align-items: center;
}
nav.primary-nav a {
  font-family: var(--sans);
  font-size: 0.88rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  color: var(--ink-muted);
  position: relative;
  padding: 6px 0;
}
nav.primary-nav a:hover { color: var(--ink); }
nav.primary-nav a.active { color: var(--accent); }
nav.primary-nav a.active::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 1.5px;
  background: var(--accent);
}
.nav-toggle { display: none; }

@media (max-width: 720px) {
  nav.primary-nav { gap: 22px; }
  nav.primary-nav a { font-size: 0.84rem; }
  .site-header .container { min-height: 64px; }
}
@media (max-width: 540px) {
  nav.primary-nav { display: none; }
  nav.primary-nav.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg);
    padding: 18px 28px;
    gap: 18px;
    border-bottom: 1px solid var(--rule-soft);
  }
  .nav-toggle {
    display: inline-flex;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: 0;
    padding: 8px;
    cursor: pointer;
  }
  .nav-toggle span {
    display: block;
    width: 22px;
    height: 1.5px;
    background: var(--ink);
  }
}

/* ==========================================================================
   HERO (HOME)
   ========================================================================== */
.hero {
  padding: 80px 0 48px;
  border-bottom: 1px solid var(--rule-soft);
}
.hero-grid {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 64px;
  align-items: start;
}
.hero-photo {
  position: relative;
}
.hero-photo img {
  width: 100%;
  border-radius: 4px;
  filter: grayscale(15%);
  box-shadow: var(--shadow-md);
}
.hero-photo::before {
  content: "";
  position: absolute;
  inset: 12px -12px -12px 12px;
  background: var(--accent-bg);
  border-radius: 4px;
  z-index: -1;
}

.eyebrow {
  font-family: var(--sans);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: #7a1f1f;
  margin-bottom: 14px;
}
.hero h1 {
  margin-top: 0;
  margin-bottom: 12px;
}
.hero .role {
  font-family: var(--sans);
  font-size: 1rem;
  color: var(--ink-muted);
  margin-bottom: 6px;
  font-weight: 500;
}
.hero .affiliation {
  font-family: var(--sans);
  font-size: 0.95rem;
  color: var(--ink-soft);
  margin-bottom: 28px;
}
.hero .lede {
  font-size: 1.08rem;
  color: var(--ink-muted);
  line-height: 1.7;
  max-width: 58ch;
  margin-bottom: 28px;
}

.highlights {
  margin: 4px 0 22px;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.highlight-item {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 18px;
  align-items: baseline;
}
.highlight-label {
  font-family: var(--sans);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: #7a1f1f;
}
.highlight-body {
  font-size: 0.98rem;
  color: var(--ink);
  line-height: 1.45;
}
.highlight-body em { font-style: italic; }
.highlight-meta {
  font-family: var(--sans);
  font-size: 0.8rem;
  color: var(--ink-soft);
  margin-left: 4px;
}
@media (max-width: 540px) {
  .highlight-item { grid-template-columns: 1fr; gap: 4px; }
}

.meta-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px 32px;
  margin-bottom: 28px;
  font-family: var(--sans);
  font-size: 0.92rem;
  border-top: 1px solid var(--rule-soft);
  padding-top: 24px;
}
.meta-grid dt {
  font-size: 0.74rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: 4px;
}
.meta-grid dd {
  margin: 0;
  color: var(--ink);
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--sans);
  font-size: 0.88rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  padding: 10px 18px;
  border-radius: 999px;
  border: 1px solid var(--rule);
  background: #fafaf7;
  color: var(--ink);
  transition: all .2s ease;
}
.btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-1px);
}
.btn.primary {
  background: var(--ink);
  color: var(--bg);
  border-color: var(--ink);
}
.btn.primary:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--bg);
  transform: translateY(-1px);
}
.btn .arrow { font-size: 0.9rem; }

@media (max-width: 820px) {
  .hero-grid { grid-template-columns: 1fr; gap: 36px; }
  .hero-photo { max-width: 240px; }
  .hero { padding: 56px 0 36px; }
}

/* ==========================================================================
   SECTIONS (HOME PAGE)
   ========================================================================== */
.section {
  padding: 64px 0;
  border-bottom: 1px solid var(--rule-soft);
}
.section:last-of-type { border-bottom: 0; }

.section-label {
  display: flex;
  align-items: center;
  gap: 16px;
  font-family: var(--sans);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: 18px;
}
.section-label::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--rule-soft);
}

.section h2 {
  margin-top: 0;
  font-size: clamp(1.6rem, 2.6vw, 2.1rem);
  max-width: 30ch;
}

.feature-card {
  background: #fafaf7;
  border: 1px solid var(--rule);
  border-radius: 10px;
  padding: 28px 32px;
  box-shadow: 0 1px 2px rgba(20, 20, 20, 0.04), 0 4px 14px rgba(20, 20, 20, 0.04);
  transition: transform .25s ease, box-shadow .25s ease;
}
.feature-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(20, 20, 20, 0.05), 0 12px 28px rgba(20, 20, 20, 0.08);
}
.feature-card .feature-eyebrow {
  font-family: var(--sans);
  font-size: 0.74rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 8px;
}
.feature-card h3 {
  font-size: 1.3rem;
  margin-bottom: 8px;
  font-weight: 500;
}
.feature-card p {
  color: var(--ink-muted);
  margin-bottom: 12px;
}

/* ==========================================================================
   PAGE HEADER (Research / Discussions)
   ========================================================================== */
.page-header {
  padding: 72px 0 36px;
}
.page-header h1 {
  margin-bottom: 12px;
}
.page-header .lede {
  font-family: var(--sans);
  font-size: 1rem;
  color: var(--ink-soft);
  max-width: 60ch;
}

.toc {
  margin: 24px 0 0 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-family: var(--sans);
}
.toc a {
  display: inline-block;
  font-size: 0.84rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  padding: 6px 14px;
  border: 1px solid var(--rule);
  border-radius: 999px;
  color: var(--ink-muted);
  background: #fafaf7;
}
.toc a:hover { border-color: var(--accent); color: var(--accent); }

/* ==========================================================================
   PAPERS (Research)
   ========================================================================== */
.papers-section {
  padding: 40px 0;
}

.papers-section .section-heading {
  display: flex;
  align-items: baseline;
  gap: 18px;
  margin-bottom: 22px;
}
.papers-section .section-heading h2 {
  font-size: clamp(1.55rem, 2.6vw, 1.95rem);
  margin: 0;
  color: var(--accent);
  font-weight: 500;
  letter-spacing: -0.005em;
}
.papers-section .section-heading .section-num {
  color: var(--ink-soft);
  font-weight: 400;
  margin-right: 6px;
}

.papers-section .section-heading .count {
  font-family: var(--sans);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.paper {
  border: 1px solid var(--rule);
  padding: 18px 22px;
  margin-bottom: 14px;
  border-radius: 8px;
  background: #fcfcfa;
  transition: background-color .2s ease, box-shadow .2s ease, border-color .2s ease;
}
.paper:hover,
.paper:has(details[open]) {
  background-color: #f6f3eb;
  border-color: #c8c4b6;
  box-shadow: 0 2px 8px rgba(20, 20, 20, 0.05);
}

.paper details > summary {
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 24px;
  align-items: start;
  outline: none;
}
.paper details > summary::-webkit-details-marker { display: none; }
.paper details > summary::marker { display: none; }

.paper-title {
  font-family: var(--serif);
  font-size: 1.18rem;
  font-weight: 500;
  color: var(--ink);
  margin-bottom: 6px;
  line-height: 1.35;
  letter-spacing: -0.005em;
}
.paper:hover .paper-title { color: var(--accent); }

.paper-authors {
  font-family: var(--sans);
  font-size: 0.92rem;
  color: var(--ink-soft);
  font-style: italic;
  margin-bottom: 8px;
}
.paper-venue {
  font-family: var(--sans);
  font-size: 0.88rem;
  color: var(--ink-muted);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: 4px;
}
.paper-venue .journal {
  font-family: var(--sans);
  font-size: 0.78rem;
  font-weight: 700;
  color: #7a1f1f;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-right: 4px;
}
.paper-venue .badge {
  display: inline-block;
  font-family: var(--sans);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  padding: 2px 12px;
  border-radius: 8px;
  vertical-align: 1px;
}
.badge.award { background: #ebedf0; color: var(--accent); }
.badge.year { background: #f5efe2; color: var(--ink-muted); }
.badge.status { background: #f5efe2; color: var(--ink-muted); }

.toggle-icon {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1px solid var(--rule);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--ink-soft);
  transition: all .25s ease;
  font-family: var(--sans);
  font-size: 1rem;
  margin-top: 4px;
}
.paper details[open] .toggle-icon {
  background: var(--ink);
  color: var(--bg);
  border-color: var(--ink);
  transform: rotate(45deg);
}
.paper:hover .toggle-icon { border-color: var(--accent); color: var(--accent); }
.paper details[open]:hover .toggle-icon { background: var(--accent); border-color: var(--accent); }

.paper-expanded {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 260px;
  gap: 22px;
  align-items: start;
  margin-top: 20px;
}
.paper-expanded .paper-abstract { margin-top: 0; }

.paper-figure {
  display: block;
  margin: 0;
  border: 1px solid var(--rule-soft);
  border-radius: 4px;
  overflow: hidden;
  background: white;
  box-shadow: var(--shadow-sm);
  cursor: zoom-in;
  padding: 12px 12px 0;
  text-decoration: none;
  color: inherit;
  transition: transform .2s ease, box-shadow .2s ease;
}
.paper-figure:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.paper-figure img { display: block; }

/* ----- Centered zoom overlay ----- */
.figure-lightbox {
  position: fixed;
  inset: 0;
  background: rgba(20, 20, 20, 0.42);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 5vw;
  cursor: zoom-out;
  opacity: 0;
  transition: opacity .22s ease;
}
.figure-lightbox.open {
  display: flex;
  opacity: 1;
}
.figure-lightbox-inner {
  position: relative;
  display: inline-block;
  cursor: default;
  animation: figpop .28s cubic-bezier(.2, .9, .3, 1.1);
}
.figure-lightbox img {
  display: block;
  max-width: min(680px, 72vw);
  max-height: 78vh;
  border-radius: 4px;
  background: white;
  padding: 16px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
  outline: 2px solid rgba(160, 152, 130, 0.6);
  cursor: default;
}
.figure-lightbox-close {
  position: absolute;
  top: -15px; right: -15px;
  width: 34px; height: 34px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.97);
  border: 1px solid var(--rule);
  color: var(--ink);
  font-size: 1.3rem;
  font-family: var(--sans);
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  z-index: 2;
}
.figure-lightbox-close:hover { background: #fff; }
@keyframes figpop {
  from { transform: scale(0.92); opacity: 0; }
  to   { transform: scale(1); opacity: 1; }
}
.paper-figure-caption {
  display: block;
  font-family: var(--sans);
  font-size: 0.72rem;
  color: var(--ink-soft);
  text-align: center;
  padding: 8px 6px 10px;
  letter-spacing: 0.01em;
  line-height: 1.35;
}
.paper-figure:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.paper-figure img {
  width: 100%;
  display: block;
  background: white;
}

@media (max-width: 720px) {
  .paper-expanded { grid-template-columns: 1fr; }
}

/* ==========================================================================
   LIGHTBOX
   ========================================================================== */
.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(20, 20, 20, 0.86);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 5vw;
  cursor: zoom-out;
  opacity: 0;
  transition: opacity .25s ease;
}
.lightbox.open {
  display: flex;
  opacity: 1;
}
.lightbox img {
  max-width: min(700px, 70vw);
  max-height: 75vh;
  border-radius: 4px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
  background: white;
  padding: 20px;
  cursor: default;
  animation: lightbox-pop .28s cubic-bezier(.2, .9, .3, 1.1);
}
.lightbox-close {
  position: absolute;
  top: 18px; right: 22px;
  width: 36px; height: 36px;
  border-radius: 50%;
  background: rgba(255,255,255,0.92);
  color: var(--ink);
  border: 0;
  font-size: 1.4rem;
  font-family: var(--sans);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
  padding: 0;
}
.lightbox-close:hover { background: white; }
@keyframes lightbox-pop {
  from { transform: scale(0.9); opacity: 0; }
  to   { transform: scale(1); opacity: 1; }
}

.paper-abstract {
  margin-top: 20px;
  padding: 20px 24px;
  background: transparent;
  border-left: 3px solid var(--accent);
  border-radius: 0 6px 6px 0;
  font-size: 0.96rem;
  line-height: 1.7;
  color: var(--ink-muted);
}
.paper-abstract p { margin: 0 0 0.8em; }
.paper-abstract p:last-child { margin-bottom: 0; }

.paper-links {
  margin-top: 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  font-family: var(--sans);
}
.paper-links a {
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  padding: 5px 12px;
  border: 1px solid var(--rule);
  border-radius: 4px;
  color: var(--ink-muted);
  background: #fafaf7;
  transition: all .2s ease;
}
.paper-links a:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ==========================================================================
   DISCUSSIONS LIST
   ========================================================================== */
.discussion-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.discussion-item {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 32px;
  align-items: start;
  padding: 22px 0;
  border-top: 1px solid var(--rule-soft);
}
.discussion-item:first-child { border-top: 1px solid var(--rule); }
.discussion-date {
  font-family: var(--sans);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-soft);
  padding-top: 4px;
}
.discussion-body { }
.discussion-title {
  font-family: var(--serif);
  font-size: 1.05rem;
  color: var(--ink);
  font-weight: 500;
  line-height: 1.4;
  margin-bottom: 4px;
}
.discussion-meta {
  font-family: var(--sans);
  font-size: 0.88rem;
  color: var(--ink-soft);
  font-style: italic;
}
.discussion-venue {
  font-family: var(--sans);
  font-size: 0.82rem;
  color: var(--ink-muted);
  margin-top: 4px;
}
.discussion-slides {
  display: inline-block;
  font-family: var(--sans);
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--accent);
  margin-top: 6px;
  letter-spacing: 0.02em;
}
.discussion-slides:hover {
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 3px;
}

@media (max-width: 640px) {
  .discussion-item {
    grid-template-columns: 1fr;
    gap: 6px;
  }
  .discussion-date { padding-top: 0; }
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.site-footer {
  background: var(--bg-alt);
  border-top: 1px solid var(--rule-soft);
  padding: 42px 0;
  margin-top: 60px;
  font-family: var(--sans);
  color: var(--ink-soft);
  font-size: 0.86rem;
}
.site-footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}
.footer-links {
  display: flex;
  gap: 22px;
  flex-wrap: wrap;
}
.footer-links a {
  color: var(--ink-muted);
  font-weight: 500;
}
.footer-links a:hover { color: var(--accent); }

/* ==========================================================================
   CV PAGE
   ========================================================================== */
.cv-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  flex-wrap: wrap;
  gap: 20px;
}
.cv-header h1 { margin-bottom: 0; }
.cv-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
.cv-actions .btn .arrow { font-size: 0.95rem; }

.cv-viewer-section {
  padding: 40px 0 64px;
}
.cv-viewer {
  width: 100%;
  height: 88vh;
  min-height: 600px;
  background: var(--bg-alt);
  border: 1px solid var(--rule);
  border-radius: 6px;
  box-shadow: var(--shadow-md);
  overflow: hidden;
}
.cv-viewer object,
.cv-viewer embed,
.cv-viewer iframe {
  width: 100%;
  height: 100%;
  border: 0;
  display: block;
}
.cv-fallback {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  height: 100%;
  font-family: var(--sans);
  gap: 18px;
  padding: 40px;
  color: var(--ink-soft);
}
.cv-fallback p { margin: 0; }

@media (max-width: 720px) {
  .cv-header { flex-direction: column; align-items: flex-start; }
  .cv-viewer { height: 70vh; min-height: 460px; }
}

/* Print */
@media print {
  .site-header, .site-footer, .toggle-icon, .nav-toggle { display: none; }
  body { background: white; color: black; }
  .paper details[open] .paper-abstract { display: block; }
}