/* ================================================
   YOUSEPH IBRAHIM — ACADEMIC WEBSITE
   Structural Geology · Tectonics · Geodynamics
   ================================================ */

/* ---------- RESET & BASE ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; }
img, video { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; font: inherit; }

/* ---------- CUSTOM PROPERTIES ---------- */
:root {
  --bg:        #f5f0e8;
  --bg-warm:   #ede7da;
  --bg-dark:   #181410;
  --ink:       #1a1714;
  --ink-muted: #5c4f47;
  --ink-faint: #9a8c84;
  --accent:    #8b4513;
  --accent-h:  #a05218;
  --sage:      #6b7c5e;
  --sage-l:    #8a9e7c;
  --border:    #d4ccc2;
  --border-l:  #e8e2d9;

  --serif: 'Cormorant Garamond', Georgia, serif;
  --sans:  'Inter', system-ui, -apple-system, sans-serif;
  --mono:  'JetBrains Mono', 'Courier New', monospace;

  --container: min(92vw, 1240px);
  --nav-h: 68px;
  --ease: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --t: 0.32s var(--ease);
}

/* ---------- BODY ---------- */
body {
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--ink);
  background: var(--bg);
}

/* ---------- TYPOGRAPHY ---------- */
h1, h2, h3, h4 {
  font-family: var(--serif);
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: -0.01em;
}

p { color: var(--ink-muted); }

.label {
  font-family: var(--mono);
  font-size: 0.67rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-faint);
  display: block;
}

/* ---------- NAVIGATION ---------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 200;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  padding: 0 clamp(1.5rem, 5vw, 4rem);
  transition: background var(--t), border-color var(--t), backdrop-filter var(--t);
}

.nav.scrolled {
  background: rgba(245, 240, 232, 0.94);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}

.nav__logo {
  font-family: var(--serif);
  font-size: 1.3rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: #f5f0e8;
  margin-right: auto;
  flex-shrink: 0;
  transition: color var(--t);
}

.nav__logo .dot { color: var(--accent); }
.nav.scrolled .nav__logo { color: var(--ink); }

.nav__links {
  display: flex;
  gap: 2.5rem;
  list-style: none;
}

.nav__links a {
  font-family: var(--sans);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(245, 240, 232, 0.8);
  transition: color var(--t);
  position: relative;
  padding-bottom: 3px;
}

.nav.scrolled .nav__links a { color: var(--ink-muted); }

.nav__links a::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0;
  width: 0; height: 1px;
  background: var(--accent);
  transition: width var(--t);
}

.nav__links a:hover::after,
.nav__links a.active::after { width: 100%; }

.nav__links a:hover { color: #f5f0e8; }
.nav.scrolled .nav__links a:hover { color: var(--ink); }
.nav__links a.active { color: #f5f0e8; }
.nav.scrolled .nav__links a.active { color: var(--ink); }

.nav__burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
  background: none;
  border: none;
}

.nav__burger span {
  width: 22px;
  height: 1.5px;
  background: #f5f0e8;
  display: block;
  transition: var(--t);
}

.nav.scrolled .nav__burger span { background: var(--ink); }

/* Pages without a hero image — nav is solid from the start */
.nav--page {
  background: rgba(245, 240, 232, 0.96);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}
.nav--page .nav__logo { color: var(--ink); }
.nav--page .nav__links a { color: var(--ink-muted); }
.nav--page .nav__links a:hover { color: var(--ink); }
.nav--page .nav__burger span { background: var(--ink); }

/* ---------- HERO ---------- */
.hero {
  position: relative;
  width: 100%;
  height: 100svh;
  min-height: 580px;
  overflow: hidden;
  display: flex;
  align-items: flex-end;
}

.hero__bg {
  position: absolute;
  inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  object-position: center 40%;
  z-index: 0;
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    160deg,
    rgba(15, 12, 10, 0.15) 0%,
    rgba(15, 12, 10, 0.5) 60%,
    rgba(15, 12, 10, 0.85) 100%
  );
  z-index: 1;
}

.hero__content {
  position: relative;
  z-index: 2;
  padding: 0 clamp(1.5rem, 5vw, 4rem) clamp(3rem, 6vw, 5.5rem);
  width: 100%;
}

.hero__eyebrow {
  font-family: var(--mono);
  font-size: 0.67rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: rgba(245, 240, 232, 0.55);
  margin-bottom: 1.2rem;
}

.hero__name {
  font-family: var(--serif);
  font-size: clamp(4rem, 10vw, 9rem);
  font-weight: 300;
  color: #f5f0e8;
  line-height: 0.92;
  letter-spacing: -0.025em;
  margin-bottom: 1.8rem;
}

.hero__name em {
  font-style: italic;
  color: rgba(245, 240, 232, 0.75);
}

.hero__subtitle {
  font-family: var(--sans);
  font-size: clamp(0.8rem, 1.2vw, 1rem);
  font-weight: 300;
  color: rgba(245, 240, 232, 0.65);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin-bottom: 3rem;
}

.hero__scroll {
  display: inline-flex;
  align-items: center;
  gap: 1rem;
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: rgba(245, 240, 232, 0.4);
}

.hero__scroll-line {
  width: 1px;
  height: 42px;
  background: rgba(245, 240, 232, 0.35);
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%, 100% { opacity: 0.35; transform: scaleY(1); transform-origin: top; }
  50% { opacity: 0.8; transform: scaleY(0.5); transform-origin: top; }
}

/* ---------- PAGE HEADERS ---------- */
.page-header {
  padding: calc(var(--nav-h) + 3.5rem) clamp(1.5rem, 5vw, 4rem) 3rem;
  position: relative;
  overflow: hidden;
  background: var(--bg-warm);
  border-bottom: 1px solid var(--border);
}

.page-header--photo {
  padding-top: calc(var(--nav-h) + 5rem);
  padding-bottom: 4rem;
  min-height: 36vh;
  display: flex;
  align-items: flex-end;
}

.page-header__bg {
  position: absolute;
  inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  object-position: center;
  z-index: 0;
}

.page-header__overlay {
  position: absolute;
  inset: 0;
  background: rgba(15, 12, 10, 0.6);
  z-index: 1;
}

.page-header__content {
  position: relative;
  z-index: 2;
  max-width: var(--container);
  margin: 0 auto;
  width: 100%;
}

.page-header__eyebrow {
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.9rem;
}

.page-header--photo .page-header__eyebrow { color: rgba(245, 240, 232, 0.5); }

.page-header__title {
  font-family: var(--serif);
  font-size: clamp(2.8rem, 6vw, 5.5rem);
  font-weight: 300;
  color: var(--ink);
  line-height: 1.0;
  letter-spacing: -0.02em;
}

.page-header--photo .page-header__title { color: #f5f0e8; }

/* ---------- SECTIONS ---------- */
.section {
  padding: clamp(4rem, 9vw, 7rem) clamp(1.5rem, 5vw, 4rem);
}

.section--warm { background: var(--bg-warm); }

.section--dark {
  background: var(--bg-dark);
  color: #f5f0e8;
}

.section__inner {
  max-width: var(--container);
  margin: 0 auto;
}

.section__header { margin-bottom: 3.5rem; }

.section__eyebrow {
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.9rem;
  display: block;
}

.section--dark .section__eyebrow { color: rgba(185, 100, 50, 0.9); }

.section__title {
  font-family: var(--serif);
  font-size: clamp(2rem, 4.5vw, 3.8rem);
  font-weight: 300;
  line-height: 1.08;
  letter-spacing: -0.015em;
  color: var(--ink);
}

.section--dark .section__title { color: #f5f0e8; }

.section__lead {
  margin-top: 1.4rem;
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--ink-muted);
  max-width: 680px;
}

.section--dark .section__lead { color: rgba(245, 240, 232, 0.6); }

/* ---------- ABOUT (HOMEPAGE) ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: start;
}

.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem 2rem;
  margin-bottom: 3rem;
}

.about-stat__num {
  font-family: var(--serif);
  font-size: 3.8rem;
  font-weight: 300;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 0.3rem;
}

.about-stat__label {
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.about-text p {
  font-size: 1rem;
  line-height: 1.85;
  margin-bottom: 1.2rem;
  color: var(--ink-muted);
}

.about-text p:first-child {
  font-family: var(--serif);
  font-size: 1.3rem;
  color: var(--ink);
  line-height: 1.6;
}

.about-keywords {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 2rem;
}

.keyword {
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-faint);
  border: 1px solid var(--border);
  padding: 0.4rem 0.85rem;
  transition: all var(--t);
}

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

/* ---------- RESEARCH THEME CARDS ---------- */
.themes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5px;
  background: var(--border);
  border: 1px solid var(--border);
}

.theme-card {
  background: var(--bg);
  padding: 2.5rem;
  transition: background var(--t);
}

.theme-card:hover { background: var(--bg-warm); }

.theme-card__num {
  font-family: var(--mono);
  font-size: 0.6rem;
  color: var(--ink-faint);
  letter-spacing: 0.15em;
  margin-bottom: 1.8rem;
  display: block;
}

.theme-card__bar {
  width: 28px;
  height: 1.5px;
  background: var(--accent);
  margin-bottom: 1.5rem;
  transition: width var(--t);
}

.theme-card:hover .theme-card__bar { width: 56px; }

.theme-card__title {
  font-family: var(--serif);
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--ink);
  margin-bottom: 1rem;
  line-height: 1.2;
}

.theme-card__text {
  font-size: 0.88rem;
  line-height: 1.78;
  color: var(--ink-muted);
}

/* ---------- FIELDWORK STRIP (HOMEPAGE) ---------- */
.fieldwork-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5px;
  background: var(--border);
  margin-top: 3rem;
}

.fieldwork-thumb {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  display: block;
}

.fieldwork-thumb img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.65s var(--ease);
}

.fieldwork-thumb:hover img { transform: scale(1.05); }

.fieldwork-thumb__caption {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  padding: 2rem 1.4rem 1.4rem;
  background: linear-gradient(to top, rgba(15, 12, 10, 0.85) 0%, transparent 100%);
}

.fieldwork-thumb__loc {
  font-family: var(--mono);
  font-size: 0.58rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(245, 240, 232, 0.55);
  margin-bottom: 0.3rem;
  display: block;
}

.fieldwork-thumb__name {
  font-family: var(--serif);
  font-size: 1.25rem;
  color: #f5f0e8;
  display: block;
}

/* ---------- NUMERICAL MODELS (DARK SECTION) ---------- */
.models-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(330px, 1fr));
  gap: 1.5px;
  background: rgba(245, 240, 232, 0.08);
  margin-top: 2.5rem;
}

.model-card {
  background: rgba(255, 255, 255, 0.025);
  border: none;
}

.model-card__video {
  width: 100%;
  height: auto;
  display: block;
  background: #0d0b09;
}

.model-card__info { padding: 1.6rem 1.8rem 2rem; }

.model-card__label {
  font-family: var(--mono);
  font-size: 0.58rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: rgba(139, 69, 19, 0.8);
  margin-bottom: 0.7rem;
  display: block;
}

.model-card__title {
  font-family: var(--serif);
  font-size: 1.35rem;
  color: #f5f0e8;
  margin-bottom: 0.7rem;
  line-height: 1.2;
}

.model-card__text {
  font-size: 0.85rem;
  line-height: 1.72;
  color: rgba(245, 240, 232, 0.5);
}

/* ---------- 3D MODEL VIEWER ---------- */
.model-viewer-wrap {
  padding-bottom: 5rem;
  margin-bottom: 5rem;
  border-bottom: 1px solid var(--border);
}

.model-viewer-wrap:last-child {
  border-bottom: none;
  padding-bottom: 0;
  margin-bottom: 0;
}

.model-viewer-layout {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 3.5rem;
  align-items: start;
}

model-viewer {
  width: 100%;
  height: 480px;
  background: var(--bg-warm);
  border: 1px solid var(--border);
  display: block;
  --progress-bar-color: var(--accent);
  --progress-bar-height: 2px;
}

.model-info__eyebrow {
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
  display: block;
}

.model-info__title {
  font-family: var(--serif);
  font-size: 2.2rem;
  font-weight: 400;
  color: var(--ink);
  margin-bottom: 1.2rem;
  line-height: 1.15;
}

.model-info__text {
  font-size: 0.93rem;
  line-height: 1.82;
  color: var(--ink-muted);
  margin-bottom: 1.5rem;
}

.model-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-top: 1.8rem;
}

.tag {
  font-family: var(--mono);
  font-size: 0.57rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0.3rem 0.7rem;
  border: 1px solid var(--border);
  color: var(--ink-faint);
}

/* ---------- FIELDWORK GALLERY PAGE ---------- */
.gallery-tabs {
  display: flex;
  border-bottom: 1px solid var(--border);
  margin-bottom: 3rem;
  overflow-x: auto;
  scrollbar-width: none;
  gap: 0;
}

.gallery-tabs::-webkit-scrollbar { display: none; }

.tab-btn {
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-faint);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  padding: 1rem 1.4rem;
  white-space: nowrap;
  margin-bottom: -1px;
  transition: all var(--t);
}

.tab-btn:hover { color: var(--ink); }
.tab-btn.active { color: var(--accent); border-bottom-color: var(--accent); }

.gallery-panel { display: none; }
.gallery-panel.active { display: block; }

.gallery-intro {
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--ink-muted);
  max-width: 580px;
  margin-bottom: 2.5rem;
  font-family: var(--serif);
  font-size: 1.1rem;
}

.photo-grid {
  columns: 3;
  column-gap: 1.5px;
}

.photo-item {
  break-inside: avoid;
  margin-bottom: 1.5px;
  overflow: hidden;
  cursor: zoom-in;
  position: relative;
  display: block;
}

.photo-item img {
  width: 100%;
  display: block;
  transition: transform 0.55s var(--ease), opacity 0.3s;
}

.photo-item:hover img {
  transform: scale(1.025);
  opacity: 0.9;
}

/* ---------- LIGHTBOX ---------- */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: rgba(12, 10, 8, 0.97);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.lightbox.open { opacity: 1; pointer-events: all; }

.lightbox__img {
  max-width: 90vw;
  max-height: 88vh;
  object-fit: contain;
  display: block;
}

.lightbox__close {
  position: absolute;
  top: 1.5rem; right: 1.5rem;
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: rgba(245, 240, 232, 0.4);
  background: none;
  border: 1px solid rgba(245, 240, 232, 0.15);
  padding: 0.5rem 1rem;
  transition: all var(--t);
}

.lightbox__close:hover {
  color: #f5f0e8;
  border-color: rgba(245, 240, 232, 0.5);
}

.lightbox__prev,
.lightbox__next {
  position: absolute;
  top: 50%; transform: translateY(-50%);
  font-size: 1.8rem;
  color: rgba(245, 240, 232, 0.3);
  background: none;
  border: none;
  padding: 1.5rem 1rem;
  transition: color var(--t);
  line-height: 1;
}

.lightbox__prev { left: 1rem; }
.lightbox__next { right: 1rem; }
.lightbox__prev:hover, .lightbox__next:hover { color: #f5f0e8; }

.lightbox__counter {
  position: absolute;
  bottom: 1.5rem; left: 50%; transform: translateX(-50%);
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.2em;
  color: rgba(245, 240, 232, 0.3);
}

/* ---------- PUBLICATIONS ---------- */
.pub-list { list-style: none; }

.pub-item {
  display: grid;
  grid-template-columns: 70px 1fr;
  gap: 2.5rem;
  padding: 2.5rem 0;
  border-bottom: 1px solid var(--border);
  align-items: start;
}

.pub-item:first-child { border-top: 1px solid var(--border); }

.pub-item__year {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--ink-faint);
  letter-spacing: 0.08em;
  padding-top: 0.35rem;
}

.pub-item__title {
  font-family: var(--serif);
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--ink);
  margin-bottom: 0.5rem;
  line-height: 1.3;
}

.pub-item__authors {
  font-size: 0.85rem;
  color: var(--ink-muted);
  margin-bottom: 0.35rem;
}

.pub-item__journal {
  font-size: 0.82rem;
  font-style: italic;
  color: var(--ink-faint);
  margin-bottom: 1.1rem;
}

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

.pub-link {
  font-family: var(--mono);
  font-size: 0.58rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  border-bottom: 1px solid currentColor;
  padding-bottom: 1px;
  transition: color var(--t);
}

.pub-link:hover { color: var(--accent-h); }

/* ---------- CONTACT ---------- */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6rem;
  align-items: start;
}

.contact-panel {
  border-top: 2px solid var(--accent);
  padding-top: 2rem;
}

.contact-item { margin-bottom: 2.5rem; }

.contact-item__label {
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 0.4rem;
  display: block;
}

.contact-item__value {
  font-family: var(--serif);
  font-size: 1.2rem;
  color: var(--ink);
  line-height: 1.4;
}

.contact-item__value a {
  color: var(--accent);
  border-bottom: 1px solid transparent;
  transition: border-color var(--t);
}

.contact-item__value a:hover { border-color: var(--accent); }

.social-links { list-style: none; margin-top: 3rem; }

.social-link {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--border-l);
  color: var(--ink-muted);
  font-size: 0.92rem;
  transition: color var(--t);
}

.social-link:hover { color: var(--accent); }

.social-link__platform {
  font-family: var(--mono);
  font-size: 0.58rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-faint);
  width: 110px;
  flex-shrink: 0;
}

.contact-quote {
  font-family: var(--serif);
  font-size: clamp(1.5rem, 2.5vw, 2rem);
  font-weight: 300;
  line-height: 1.55;
  color: var(--ink);
  font-style: italic;
  border-left: 3px solid var(--accent);
  padding-left: 2rem;
  margin-bottom: 2.5rem;
}

/* ---------- FOOTER ---------- */
.footer {
  background: var(--bg-dark);
  padding: 2.8rem clamp(1.5rem, 5vw, 4rem);
}

.footer__inner {
  max-width: var(--container);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer__name {
  font-family: var(--serif);
  font-size: 1rem;
  color: rgba(245, 240, 232, 0.55);
  letter-spacing: 0.04em;
}

.footer__nav {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.footer__nav a {
  font-family: var(--mono);
  font-size: 0.58rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(245, 240, 232, 0.25);
  transition: color var(--t);
}

.footer__nav a:hover { color: rgba(245, 240, 232, 0.6); }

.footer__copy {
  font-family: var(--mono);
  font-size: 0.57rem;
  letter-spacing: 0.1em;
  color: rgba(245, 240, 232, 0.2);
}

/* ---------- UTILITIES ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  padding: 0.85rem 1.7rem;
  border: 1px solid currentColor;
  background: none;
  transition: all var(--t);
}

.btn--accent { color: var(--accent); }
.btn--accent:hover { background: var(--accent); color: #f5f0e8; }

.btn--light { color: rgba(245, 240, 232, 0.6); border-color: rgba(245, 240, 232, 0.25); }
.btn--light:hover { color: #f5f0e8; border-color: rgba(245, 240, 232, 0.7); background: rgba(245,240,232,0.06); }

.divider { border: none; border-top: 1px solid var(--border); margin: 3rem 0; }

.text-center { text-align: center; }
.mt-2 { margin-top: 2rem; }
.mt-3 { margin-top: 3rem; }

/* ---------- SCROLL REVEAL ---------- */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.reveal.visible { opacity: 1; transform: none; }
.reveal-d1 { transition-delay: 0.08s; }
.reveal-d2 { transition-delay: 0.16s; }
.reveal-d3 { transition-delay: 0.24s; }
.reveal-d4 { transition-delay: 0.32s; }
.reveal-d5 { transition-delay: 0.4s; }

/* ---------- RESPONSIVE ---------- */
@media (max-width: 960px) {
  .about-grid { grid-template-columns: 1fr; gap: 3rem; }
  .model-viewer-layout { grid-template-columns: 1fr; }
  .contact-layout { grid-template-columns: 1fr; gap: 3rem; }
  .fieldwork-strip { grid-template-columns: 1fr 1fr; }
  .themes-grid { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
}

@media (max-width: 640px) {
  .nav__links { display: none; }
  .nav__burger { display: flex; }
  .photo-grid { columns: 2; }
  .fieldwork-strip { grid-template-columns: 1fr; }
  .about-stats { grid-template-columns: 1fr 1fr; }
  .pub-item { grid-template-columns: 1fr; gap: 0.5rem; }
  .pub-item__year { padding-top: 0; }
  .models-grid { grid-template-columns: 1fr; }

  .nav__links.mobile-open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: var(--nav-h);
    left: 0; right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    padding: 1.5rem 2rem 2rem;
    gap: 1.3rem;
    box-shadow: 0 8px 32px rgba(26,23,20,0.1);
  }

  .nav__links.mobile-open a { color: var(--ink-muted); }
}