/* ============================================================
   Sirus H. Dehdari — Academic Portfolio
   ============================================================ */

/* ---------- CSS Variables ---------- */
:root {
  --navy:       #2d3748;
  --navy-dark:  #1a202c;
  --navy-light: #4a5568;
  --gold:       #c8a44a;
  --gold-light: #e2c47a;
  --white:      #ffffff;
  --gray-50:    #f8f9fb;
  --gray-100:   #f0f2f6;
  --gray-200:   #e2e6ed;
  --gray-400:   #9aa3b2;
  --gray-600:   #5a6476;
  --gray-800:   #2d3748;
  --text:       #1f2937;
  --text-light: #4b5563;

  --font-serif: 'Playfair Display', Georgia, serif;
  --font-sans:  'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  --radius-sm:  4px;
  --radius:     8px;
  --radius-lg:  16px;
  --shadow-sm:  0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);
  --shadow:     0 4px 16px rgba(0,0,0,.10);
  --shadow-lg:  0 12px 40px rgba(0,0,0,.14);

  --nav-h:      68px;
  --transition: 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-h);
  font-size: 16px;
}

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

img { display: block; max-width: 100%; }
a  { color: var(--gold); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--gold-light); }

/* ---------- Utilities ---------- */
.container {
  width: 100%;
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 100px 0;
}

.section-alt {
  background: var(--gray-50);
}

.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-label {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: .75rem;
  font-weight: 600;
  letter-spacing: .15em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 10px;
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 700;
  color: var(--navy);
  line-height: 1.2;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius);
  font-family: var(--font-sans);
  font-size: .9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  border: 2px solid transparent;
  text-decoration: none;
}

.btn-primary {
  background: var(--gold);
  color: var(--navy-dark);
  border-color: var(--gold);
}
.btn-primary:hover {
  background: var(--gold-light);
  border-color: var(--gold-light);
  color: var(--navy-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(200, 164, 74, .4);
}

.btn-outline {
  background: transparent;
  color: var(--text);
  border-color: var(--gray-200);
}
.btn-outline:hover {
  background: var(--gray-100);
  border-color: var(--gray-400);
  color: var(--text);
  transform: translateY(-2px);
}

/* ---------- Navigation ---------- */
#navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  height: var(--nav-h);
  background: rgba(255,255,255,.97);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--gray-200);
  transition: background var(--transition), box-shadow var(--transition);
}

#navbar.scrolled {
  background: rgba(255,255,255,.99);
  box-shadow: var(--shadow-sm);
}

.nav-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: .01em;
  text-decoration: none;
  transition: color var(--transition);
}
.nav-brand:hover { color: var(--gold); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 2px;
  list-style: none;
}

.nav-links a {
  font-size: .875rem;
  font-weight: 500;
  color: var(--gray-600);
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
  text-decoration: none;
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--text);
  background: var(--gray-100);
}

.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(--text);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ---------- Hero ---------- */
.hero {
  background: var(--white);
  padding: calc(var(--nav-h) + 72px) 0 72px;
  border-bottom: 1px solid var(--gray-200);
}

.hero-inner {
  display: flex;
  align-items: center;
  gap: 56px;
}

.hero-photo-wrap {
  flex-shrink: 0;
  text-align: center;
}

.hero-profile-photo {
  width: 180px;
  height: 180px;
  object-fit: cover;
  object-position: center top;
  border-radius: 50%;
  border: 3px solid var(--gray-200);
  box-shadow: var(--shadow);
  display: block;
  margin: 0 auto 8px;
}

.hero-content {
  flex: 1;
}

.hero-eyebrow {
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .15em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 12px;
}

.hero-name {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 700;
  color: var(--text);
  line-height: 1.1;
  margin-bottom: 12px;
  letter-spacing: -.02em;
}

.hero-subtitle {
  font-size: 1rem;
  color: var(--text-light);
  line-height: 1.6;
  margin-bottom: 10px;
}

.hero-tagline {
  font-size: .975rem;
  color: var(--gray-600);
  max-width: 540px;
  margin-bottom: 28px;
  line-height: 1.65;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

/* ---------- About ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 260px;
  gap: 52px;
  align-items: start;
}

.about-photo {
  text-align: center;
}

.profile-photo {
  width: 200px;
  height: 200px;
  object-fit: cover;
  object-position: center top;
  border-radius: 50%;
  border: 4px solid var(--white);
  box-shadow: 0 8px 32px rgba(26,39,68,.18), 0 0 0 2px var(--gold);
  display: block;
  margin: 0 auto 10px;
}

.photo-credit {
  font-size: .72rem;
  color: var(--gray-400);
  font-style: italic;
}

.about-bio p {
  color: var(--text-light);
  margin-bottom: 1.2rem;
  font-size: 1.025rem;
}
.about-bio p strong { color: var(--text); font-weight: 600; }
.about-bio p em { font-style: italic; color: var(--text); }

.about-interests h3 {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  color: var(--navy);
  margin-bottom: 14px;
}

.interest-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.interest-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: .95rem;
  color: var(--text-light);
}
.interest-list li::before {
  content: '';
  flex-shrink: 0;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--gold);
}

/* ---------- Award badge as link ---------- */
a.pub-award {
  text-decoration: none;
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition);
}
a.pub-award:hover {
  background: rgba(251, 191, 36, .28);
  border-color: rgba(251, 191, 36, .55);
  color: #b45309;
}

/* ---------- Publications ---------- */
.pub-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  align-items: start;
}

.pub-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 32px 36px;
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
  position: relative;
}
.pub-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 4px; height: 100%;
  background: var(--gold);
  border-radius: var(--radius-lg) 0 0 var(--radius-lg);
  opacity: 0;
  transition: opacity var(--transition);
}
.pub-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-3px);
  border-color: var(--gray-200);
}
.pub-card:hover::before {
  opacity: 1;
}

.pub-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.pub-journal {
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--navy);
  background: var(--gray-100);
  padding: 4px 12px;
  border-radius: 20px;
}

.pub-year {
  font-size: .8rem;
  font-weight: 600;
  color: var(--gold);
  background: rgba(200, 164, 74, .12);
  padding: 4px 12px;
  border-radius: 20px;
}

.pub-award {
  font-size: .78rem;
  font-weight: 600;
  color: #b45309;
  background: rgba(251, 191, 36, .15);
  padding: 4px 12px;
  border-radius: 20px;
  border: 1px solid rgba(251, 191, 36, .3);
}

.pub-title {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--navy);
  line-height: 1.4;
  margin-bottom: 8px;
}

.pub-authors {
  font-size: .9rem;
  color: var(--gray-600);
  margin-bottom: 6px;
}

.pub-info {
  font-size: .85rem;
  color: var(--gray-400);
  font-style: italic;
  margin-bottom: 16px;
}

.pub-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 16px;
}

.btn-abstract {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-sans);
  font-size: .82rem;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--navy);
  background: var(--gray-100);
  border: 1px solid var(--gray-200);
  border-radius: 20px;
  padding: 6px 16px;
  cursor: pointer;
  transition: all var(--transition);
}
.btn-abstract:hover {
  background: var(--navy);
  color: var(--white);
  border-color: var(--navy);
}
.btn-abstract[aria-expanded="true"] {
  background: var(--navy);
  color: var(--white);
  border-color: var(--navy);
}
.btn-abstract[aria-expanded="true"] svg {
  transform: rotate(180deg);
}
.btn-abstract svg {
  transition: transform var(--transition);
}

.btn-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-sans);
  font-size: .82rem;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--gold);
  background: transparent;
  border: 1px solid rgba(200, 164, 74, .35);
  border-radius: 20px;
  padding: 6px 16px;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}
.btn-link:hover {
  background: var(--gold);
  color: var(--navy-dark);
  border-color: var(--gold);
}

.btn-link-wp {
  margin-top: 16px;
}

.btn-scholar {
  color: var(--navy);
  border-color: rgba(26, 39, 68, .25);
}
.btn-scholar:hover {
  background: var(--navy);
  color: var(--white);
  border-color: var(--navy);
}

.abstract-panel {
  margin-top: 20px;
  padding: 20px 24px;
  background: var(--gray-50);
  border-left: 3px solid var(--gold);
  border-radius: 0 var(--radius) var(--radius) 0;
  animation: slideDown .25s ease;
}
.abstract-panel p {
  font-size: .95rem;
  color: var(--text-light);
  line-height: 1.75;
}
.abstract-panel p em { font-style: italic; }

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-8px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ---------- Working Papers ---------- */
.wp-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.wp-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  position: relative;
  transition: box-shadow var(--transition), transform var(--transition);
}
.wp-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.wp-number {
  font-family: var(--font-serif);
  font-size: 3rem;
  font-weight: 700;
  color: var(--gray-100);
  line-height: 1;
  margin-bottom: 16px;
  user-select: none;
}

.wp-card h3 {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--navy);
  margin-bottom: 12px;
  line-height: 1.4;
}

.wp-card p {
  font-size: .9rem;
  color: var(--text-light);
  line-height: 1.65;
}

/* ---------- Teaching ---------- */
.teaching-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}

.teaching-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  text-align: center;
  transition: box-shadow var(--transition), transform var(--transition);
}
.teaching-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.teaching-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 64px; height: 64px;
  background: var(--gray-50);
  border-radius: 50%;
  margin: 0 auto 20px;
  color: var(--navy);
}

.teaching-card h3 {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  color: var(--navy);
  margin-bottom: 6px;
}

.teaching-institution {
  font-size: .85rem;
  font-weight: 600;
  color: var(--gold);
  margin-bottom: 16px;
  letter-spacing: .04em;
  text-transform: uppercase;
}

.teaching-card p {
  font-size: .93rem;
  color: var(--text-light);
}

/* ---------- Contact ---------- */
.contact-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  max-width: 700px;
  margin: 0 auto;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  font-size: .95rem;
  color: var(--text-light);
  line-height: 1.6;
}
.contact-item svg {
  flex-shrink: 0;
  margin-top: 2px;
  color: var(--gold);
}
.contact-item a {
  color: var(--text-light);
  transition: color var(--transition);
}
.contact-item a:hover { color: var(--gold); }

.contact-links {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.contact-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 22px;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  font-size: .9rem;
  font-weight: 500;
  color: var(--text);
  background: var(--white);
  transition: all var(--transition);
  text-decoration: none;
}
.contact-btn:hover {
  background: var(--navy);
  color: var(--white);
  border-color: var(--navy);
  transform: translateX(4px);
}

/* ---------- Scholar Badge ---------- */
.scholar-badge-row {
  margin-top: 1.5rem;
}

.scholar-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  background: var(--navy);
  color: var(--white) !important;
  border-radius: 20px;
  font-size: .85rem;
  font-weight: 600;
  text-decoration: none;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
}

.scholar-badge:hover {
  background: var(--navy-light);
  color: var(--white) !important;
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.scholar-badge-row {
  margin-top: 1.5rem;
}

/* ---------- Altmetric ---------- */
.pub-meta .altmetric-embed {
  margin-left: auto;
}

/* ---------- Grants ---------- */
.grant-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.grant-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 28px 32px;
  transition: box-shadow var(--transition), transform var(--transition);
  position: relative;
}

.grant-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 4px; height: 100%;
  background: var(--gold);
  border-radius: var(--radius-lg) 0 0 var(--radius-lg);
  opacity: 0;
  transition: opacity var(--transition);
}

.grant-card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.grant-card:hover::before {
  opacity: 1;
}

.grant-funder {
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 8px;
}

.grant-title {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--navy);
  line-height: 1.4;
  margin-bottom: 8px;
}

.grant-role {
  font-size: .88rem;
  color: var(--text-light);
}

/* ---------- Footer ---------- */
.footer {
  background: var(--navy-dark);
  color: rgba(255,255,255,.45);
  text-align: center;
  padding: 32px 24px;
  font-size: .85rem;
}

/* ---------- Reveal Animations ---------- */
.reveal,
.fade-up {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity .65s ease, transform .65s ease;
}
.reveal.visible,
.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger children inside section-header */
.section-header .section-label { transition-delay: 0s; }
.section-header .section-title  { transition-delay: .08s; }

/* ---------- Mobile Nav ---------- */
@media (max-width: 768px) {
  .nav-toggle { display: flex; }

  .nav-links {
    position: fixed;
    top: var(--nav-h); left: 0; right: 0;
    background: var(--navy-dark);
    flex-direction: column;
    align-items: stretch;
    padding: 12px 16px 24px;
    gap: 4px;
    border-bottom: 1px solid rgba(255,255,255,.08);
    transform: translateY(-110%);
    opacity: 0;
    transition: transform .3s ease, opacity .3s ease;
    pointer-events: none;
  }
  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .nav-links a {
    padding: 12px 16px;
    border-radius: var(--radius);
  }

  /* Mobile hamburger → X */
  .nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-toggle.open span:nth-child(2) { opacity: 0; }
  .nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .section { padding: 72px 0; }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .profile-photo {
    width: 160px;
    height: 160px;
  }

  .contact-wrapper {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .pub-list {
    grid-template-columns: 1fr;
  }

  .pub-card {
    padding: 24px 20px;
  }

  .hero-inner {
    flex-direction: column;
    text-align: center;
    gap: 28px;
  }
  .hero-actions { justify-content: center; }
  .hero-tagline { margin-left: auto; margin-right: auto; }
  .hero-profile-photo { width: 140px; height: 140px; }
  .hero-name { font-size: clamp(1.8rem, 8vw, 2.5rem); }
}

@media (max-width: 480px) {
  .wp-grid { grid-template-columns: 1fr; }
}