/* =====================================================
   Zamira Abman – Academic Website Stylesheet
   ===================================================== */

/* ── Custom Properties ─────────────────────────────── */
:root {
  --color-dark:        #0f172a;   /* near-black navy */
  --color-dark-2:      #1e293b;   /* slightly lighter navy */
  --color-accent:      #6366f1;   /* indigo */
  --color-accent-dark: #4f46e5;
  --color-accent-glow: rgba(99, 102, 241, 0.15);
  --color-light:       #f8fafc;
  --color-off-white:   #f1f5f9;
  --color-white:       #ffffff;
  --color-text:        #1e293b;
  --color-muted:       #64748b;
  --color-border:      #e2e8f0;

  --font-serif:  'Playfair Display', Georgia, serif;
  --font-sans:   'Inter', system-ui, sans-serif;

  --nav-height:  72px;
  --max-width:   1140px;
  --radius:      4px;
  --transition:  0.25s ease;
}

/* ── Reset & Base ──────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
}

img {
  max-width: 100%;
  display: block;
}

/* ── Typography helpers ────────────────────────────── */
.section-tag {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 1rem;
}

.section-tag--light {
  color: rgba(165, 180, 252, 0.9); /* indigo-300 */
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 700;
  color: var(--color-dark);
  line-height: 1.2;
  margin-bottom: 1.25rem;
}

.section-title--light {
  color: var(--color-white);
}

.section-intro {
  font-size: 1.05rem;
  color: var(--color-muted);
  max-width: 560px;
  margin-bottom: 3rem;
}

.section-intro--light {
  color: rgba(203, 213, 225, 0.9);
}

.section-header {
  text-align: center;
  margin-bottom: 3.5rem;
}

.section-header .section-intro {
  margin-left: auto;
  margin-right: auto;
}

/* ── Buttons ───────────────────────────────────────── */
.btn {
  display: inline-block;
  padding: 0.75rem 1.75rem;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  border-radius: var(--radius);
  transition: all var(--transition);
  cursor: pointer;
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-white);
}

.btn-primary:hover {
  background: var(--color-accent-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(99, 102, 241, 0.35);
}

.btn-outline {
  border: 2px solid rgba(255,255,255,0.5);
  color: var(--color-white);
}

.btn-outline:hover {
  border-color: var(--color-white);
  background: rgba(255,255,255,0.1);
  transform: translateY(-2px);
}

/* ── Layout Containers ─────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: 2rem;
}

.container--split {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 0 4rem;
  align-items: start;
}

.split-label {
  padding-top: 0.5rem;
}

/* ── Sections ──────────────────────────────────────── */
.section {
  padding: 6rem 0;
}

.section--light {
  background: var(--color-white);
}

.section--off-white {
  background: var(--color-off-white);
}

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

/* ── Navigation ────────────────────────────────────── */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  background: transparent;
  transition: background var(--transition), box-shadow var(--transition);
}

.site-header.scrolled {
  background: rgba(15, 23, 42, 0.95);
  backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 rgba(255,255,255,0.06);
}

.nav-container {
  height: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-white);
  letter-spacing: 0.01em;
  transition: opacity var(--transition);
}

.nav-logo:hover {
  opacity: 0.8;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: rgba(255,255,255,0.75);
  padding: 0.5rem 0.85rem;
  border-radius: var(--radius);
  transition: color var(--transition), background var(--transition);
}

.nav-links a:hover {
  color: var(--color-white);
  background: rgba(255,255,255,0.08);
}

.nav-links .nav-cta {
  background: var(--color-accent);
  color: var(--color-white);
  margin-left: 0.5rem;
  padding: 0.5rem 1.1rem;
}

.nav-links .nav-cta:hover {
  background: var(--color-accent-dark);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-white);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ── Hero ──────────────────────────────────────────── */
.hero {
  min-height: 100vh;
  background: var(--color-dark);
  background-image:
    radial-gradient(ellipse 80% 60% at 70% 50%, rgba(99,102,241,0.12) 0%, transparent 70%),
    radial-gradient(ellipse 50% 80% at 10% 80%, rgba(99,102,241,0.06) 0%, transparent 60%);
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 0 2rem;
  position: relative;
}

.hero-content {
  max-width: var(--max-width);
  margin-inline: auto;
  width: 100%;
  padding-top: var(--nav-height);
}

.hero-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 3rem;
}

.hero-text {
  flex: 1;
}

.hero-photo-wrap {
  flex-shrink: 0;
  width: 280px;
  height: 280px;
  border-radius: 50%;
  overflow: hidden;
  border: 3px solid rgba(99, 102, 241, 0.4);
  box-shadow: 0 0 0 8px rgba(99, 102, 241, 0.08);
}

.hero-photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
}

.hero-eyebrow {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 1.25rem;
}

.hero-name {
  font-family: var(--font-serif);
  font-size: clamp(4rem, 10vw, 8.5rem);
  font-weight: 900;
  color: var(--color-white);
  line-height: 0.95;
  letter-spacing: -0.02em;
  margin-bottom: 2rem;
}

.hero-affiliation {
  font-size: 1rem;
  color: rgba(148, 163, 184, 0.9);
  line-height: 1.6;
  margin-bottom: 2.5rem;
  max-width: 420px;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.hero-scroll-hint {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: rgba(255,255,255,0.3);
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, rgba(255,255,255,0.3), transparent);
  animation: scrollPulse 2s ease infinite;
}

@keyframes scrollPulse {
  0%, 100% { opacity: 0.3; transform: scaleY(1); }
  50%       { opacity: 0.8; transform: scaleY(1.1); }
}

/* ── About ─────────────────────────────────────────── */
.bio-text p {
  color: var(--color-muted);
  margin-bottom: 1.25rem;
  font-size: 1.05rem;
  line-height: 1.8;
}

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

.about-meta {
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem 2rem;
}

.meta-item {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.meta-label {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.meta-value {
  font-size: 0.95rem;
  color: var(--color-text);
}

/* ── Research ──────────────────────────────────────── */
.research-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.research-card {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 8px;
  padding: 2rem;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.research-card:hover {
  transform: translateY(-4px);
  border-color: rgba(99,102,241,0.4);
  box-shadow: 0 8px 32px rgba(99,102,241,0.12);
}

.research-card-number {
  font-family: var(--font-serif);
  font-size: 3rem;
  font-weight: 700;
  color: rgba(99,102,241,0.2);
  line-height: 1;
  margin-bottom: 1rem;
}

.research-card-title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 0.75rem;
}

.research-card-desc {
  font-size: 0.925rem;
  color: rgba(148,163,184,0.9);
  line-height: 1.7;
}

/* ── Teaching ──────────────────────────────────────── */
.courses-list {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

.course-group-label {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--color-border);
}

.course-items {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.course-item {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 1rem;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.95rem;
  transition: background var(--transition);
}

.course-item:first-child {
  border-top: 0;
}

.course-code {
  font-weight: 600;
  color: var(--color-dark-2);
  font-size: 0.875rem;
}

.course-name {
  color: var(--color-muted);
}

/* ── Publications ──────────────────────────────────── */
.pub-group {
  margin-bottom: 3rem;
}

.pub-group:last-child {
  margin-bottom: 0;
}

.pub-group-title {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 1.25rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-accent);
  display: inline-block;
}

.pub-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.pub-item {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 1.5rem;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition);
}

.pub-item:last-child {
  border-bottom: none;
}

.pub-year {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-accent);
  padding-top: 0.2rem;
  white-space: nowrap;
}

.pub-details {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.pub-citation {
  font-size: 0.975rem;
  color: var(--color-text);
  line-height: 1.7;
}

.pub-citation em {
  font-style: italic;
}

.pub-link {
  font-size: 0.825rem;
  font-weight: 600;
  color: var(--color-accent);
  transition: color var(--transition);
  width: fit-content;
}

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

/* ── Contact ───────────────────────────────────────── */
.contact-items {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}

.contact-item {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.contact-label {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: rgba(165,180,252,0.7);
}

.contact-value {
  font-size: 1rem;
  color: rgba(226,232,240,0.9);
  line-height: 1.6;
  transition: color var(--transition);
}

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

.cv-download {
  margin-top: 1rem;
}

/* ── Footer ────────────────────────────────────────── */
.site-footer {
  background: #060d18;
  padding: 3rem 0;
  text-align: center;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.footer-name {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  color: var(--color-white);
  font-weight: 700;
}

.footer-affiliation {
  font-size: 0.825rem;
  color: rgba(148,163,184,0.6);
  line-height: 1.6;
}

.footer-copy {
  font-size: 0.75rem;
  color: rgba(148,163,184,0.35);
  margin-top: 0.5rem;
}

/* ── Responsive ────────────────────────────────────── */
@media (max-width: 900px) {
  .container--split {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }

  .split-label {
    padding-top: 0;
  }

  .about-meta {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  :root {
    --nav-height: 64px;
  }

  .section {
    padding: 4rem 0;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-links {
    display: none;
    position: fixed;
    inset: var(--nav-height) 0 0 0;
    background: var(--color-dark);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1.5rem;
    z-index: 99;
  }

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

  .nav-links a {
    font-size: 1.1rem;
  }

  .nav-links .nav-cta {
    margin-left: 0;
  }

  .hero-name {
    font-size: clamp(3rem, 14vw, 5rem);
  }

  .hero-scroll-hint {
    display: none;
  }

  .hero-inner {
    flex-direction: column-reverse;
    align-items: flex-start;
    gap: 2rem;
  }

  .hero-photo-wrap {
    width: 160px;
    height: 160px;
    align-self: center;
  }

  .research-grid {
    grid-template-columns: 1fr;
  }

  .pub-item {
    grid-template-columns: 56px 1fr;
    gap: 1rem;
  }

  .course-item {
    grid-template-columns: 90px 1fr;
  }
}

@media (max-width: 480px) {
  .container {
    padding-inline: 1.25rem;
  }

  .pub-item {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }

  .hero-actions {
    flex-direction: column;
    align-items: flex-start;
  }
}