/* ============================================
   Ahmed Kamal — personal site
   Dark purple academic theme
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:wght@400;500;600&family=Geist+Mono:wght@400;500&family=Geist:wght@300;400;500;600&display=swap');

:root {
  /* Background layers — darkest to lightest */
  --bg-base:        #0a0612;
  --bg-surface:     #120a1f;
  --bg-elevated:    #1a1030;
  --bg-hover:       #221540;

  /* Borders */
  --border-subtle:  #2a1f3d;
  --border-strong:  #4a3878;

  /* Text */
  --text-primary:   #f4f0ff;
  --text-secondary: #b8accc;
  --text-muted:     #a89cc4;
  --text-faint:     #8a7eb0;

  /* Purple accents */
  --accent:         #c9b8ff;
  --accent-strong:  #d4c5ff;
  --accent-bg:      #2d1f4d;

  /* Typography */
  --font-display: 'Cormorant Garamond', Georgia, serif;
  --font-body:    'Geist', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono:    'Geist Mono', 'SF Mono', Menlo, monospace;

  /* Layout */
  --max-width: 1400px;
  --radius-sm: 6px;
  --radius-md: 10px;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg-base);
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: 24px;
  line-height: 1.75;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Subtle ambient gradient in the background */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background: radial-gradient(ellipse at top, rgba(74, 56, 120, 0.15) 0%, transparent 60%);
  pointer-events: none;
  z-index: -1;
}

/* ============================================
   LAYOUT
   ============================================ */

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
  width: 100%;
}

main {
  flex: 1;
  padding: 4rem 0 5rem;
}

/* ============================================
   NAV
   ============================================ */

.nav {
  border-bottom: 0.5px solid var(--border-subtle);
  background: rgba(10, 6, 18, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 10;
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 500;
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: 0.01em;
}

.nav-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

.nav-links a {
  font-size: 14px;
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.18s ease;
  letter-spacing: 0.01em;
}

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

/* ============================================
   TYPOGRAPHY
   ============================================ */

h1, h2, h3, h4 {
  color: var(--text-primary);
  font-family: var(--font-display);
  font-weight: 500;
  line-height: 1.2;
  letter-spacing: -0.005em;
}

h1 { font-size: 44px; margin-bottom: 1rem; }
h2 { font-size: 30px; margin-bottom: 1.25rem; }
h3 { font-size: 20px; font-family: var(--font-body); font-weight: 500; }
h4 { font-size: 17px; font-family: var(--font-body); font-weight: 500; }

p { margin-bottom: 1rem; }
p:last-child { margin-bottom: 0; }

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 0.5px solid transparent;
  transition: border-color 0.18s ease;
}

a:hover { border-bottom-color: var(--accent); }

.eyebrow {
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-faint);
  font-weight: 500;
  margin-bottom: 1rem;
  font-family: var(--font-mono);
}

.lead {
  font-size: 19px;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 720px;
}

/* ============================================
   HERO
   ============================================ */

.hero {
  padding-top: 2rem;
  padding-bottom: 3rem;
  border-bottom: 0.5px solid var(--border-subtle);
  margin-bottom: 3rem;
}

.hero h1 {
  font-size: 72px;
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
}

/* ============================================
   TAGS / PILLS
   ============================================ */

.tags {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-top: 1.5rem;
}

.tag {
  font-size: 12px;
  padding: 5px 12px;
  border-radius: 999px;
  background: transparent;
  color: var(--text-muted);
  border: 0.5px solid var(--border-subtle);
  font-family: var(--font-mono);
  letter-spacing: 0.01em;
}

.tag.tag-accent {
  background: var(--accent-bg);
  color: var(--accent-strong);
  border-color: var(--border-strong);
}

/* ============================================
   SECTIONS
   ============================================ */

section { margin-bottom: 3.5rem; }
section:last-child { margin-bottom: 0; }

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 1.75rem;
}

.section-head a {
  font-size: 13px;
  color: var(--text-faint);
  font-family: var(--font-mono);
}

/* ============================================
   RESEARCH / TIMELINE LIST
   ============================================ */

.entry-list { display: flex; flex-direction: column; }

.entry {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 1.25rem;
  padding: 1.25rem 0;
  border-bottom: 0.5px solid var(--border-subtle);
}

.entry:last-child { border-bottom: none; }

.entry-year {
  font-size: 12px;
  color: var(--text-faint);
  font-family: var(--font-mono);
  padding-top: 4px;
  letter-spacing: 0.04em;
}

.entry-title {
  font-size: 19px;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 8px;
  letter-spacing: -0.005em;
}

.entry-desc {
  font-size: 16px;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 0.5rem;
}

.entry-meta {
  font-size: 12px;
  color: var(--text-faint);
  font-family: var(--font-mono);
  margin-top: 4px;
}

.entry-links {
  display: flex;
  gap: 1rem;
  margin-top: 0.75rem;
  font-size: 13px;
}

/* ============================================
   PROJECTS GRID
   ============================================ */

.project-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.project-card {
  background: var(--bg-elevated);
  border: 0.5px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.25rem 1.1rem;
  transition: border-color 0.18s ease, background 0.18s ease, transform 0.18s ease;
  text-decoration: none;
  color: inherit;
  display: block;
}

.project-card:hover {
  border-color: var(--border-strong);
  background: var(--bg-hover);
  transform: translateY(-1px);
}

.project-card-head {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 8px;
}

.project-card-icon {
  font-size: 17px;
  color: var(--accent);
}

.project-card-title {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
}

.project-card-meta {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.55;
  font-family: var(--font-mono);
  letter-spacing: 0.01em;
}

.project-card-desc {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-top: 8px;
}

@media (max-width: 900px) {
  .project-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 600px) {
  .project-grid { grid-template-columns: 1fr; }
}

/* ============================================
   CV / RESUME PAGE
   ============================================ */

.cv-section {
  padding-bottom: 2rem;
  margin-bottom: 2rem;
  border-bottom: 0.5px solid var(--border-subtle);
}

.cv-section:last-child { border-bottom: none; }

.cv-item {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 1.25rem;
  padding: 1rem 0;
}

.cv-item-date {
  font-size: 12px;
  color: var(--text-faint);
  font-family: var(--font-mono);
  padding-top: 3px;
  letter-spacing: 0.03em;
}

.cv-item h3 {
  font-size: 15px;
  margin-bottom: 4px;
  color: var(--text-primary);
}

.cv-item .institution {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 6px;
  font-style: italic;
  font-family: var(--font-display);
}

.cv-item p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.65;
}

.cv-item ul {
  list-style: none;
  margin-top: 6px;
}

.cv-item ul li {
  font-size: 14px;
  color: var(--text-secondary);
  padding-left: 1.1rem;
  position: relative;
  line-height: 1.65;
  margin-bottom: 3px;
}

.cv-item ul li::before {
  content: '·';
  position: absolute;
  left: 0;
  top: 0;
  color: var(--accent);
  font-weight: 700;
  font-size: 16px;
  line-height: 1.65;
}

.cv-skills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 8px;
}

/* ============================================
   CONTACT PAGE
   ============================================ */

.contact-list {
  list-style: none;
  margin-top: 2rem;
}

.contact-list li {
  padding: 1.1rem 0;
  border-bottom: 0.5px solid var(--border-subtle);
  display: flex;
  align-items: center;
  gap: 1rem;
}

.contact-list li:last-child { border-bottom: none; }

.contact-icon {
  font-size: 20px;
  color: var(--accent);
  width: 24px;
  text-align: center;
}

.contact-label {
  font-size: 12px;
  color: var(--text-faint);
  font-family: var(--font-mono);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  width: 90px;
  flex-shrink: 0;
}

.contact-value {
  font-size: 15px;
  color: var(--text-primary);
}

/* ============================================
   FOOTER
   ============================================ */

.footer {
  border-top: 0.5px solid var(--border-subtle);
  padding: 1.5rem 0;
  margin-top: auto;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--text-faint);
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

.footer-links { display: flex; gap: 1.25rem; }

.footer-links a {
  color: var(--text-muted);
  border: none;
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.footer-links a:hover { color: var(--accent); border: none; }

/* ============================================
   IMAGES & FIGURES
   ============================================ */

figure {
  margin: 2rem 0;
}

figure img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius-md);
  border: 0.5px solid var(--border-subtle);
}

figcaption {
  font-size: 13px;
  color: var(--text-faint);
  font-family: var(--font-mono);
  margin-top: 0.75rem;
  text-align: center;
  letter-spacing: 0.02em;
}

/* Two-column image layout */
.figure-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 2rem 0;
}

@media (max-width: 700px) {
  .figure-grid { grid-template-columns: 1fr; }
}

/* Profile photo on About page */
.profile-photo {
  width: 220px;
  height: 220px;
  border-radius: 50%;
  object-fit: cover;
  border: 0.5px solid var(--border-subtle);
  margin-bottom: 2rem;
}

/* ============================================
   HONORS LIST
   ============================================ */

.honor-list {
  list-style: none;
  display: flex;
  flex-direction: column;
}

.honor-list li {
  padding: 1.1rem 0;
  border-bottom: 0.5px solid var(--border-subtle);
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 1.25rem;
  align-items: baseline;
}

.honor-list li:last-child { border-bottom: none; }

.honor-year {
  font-size: 13px;
  color: var(--text-faint);
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}

.honor-title {
  font-size: 16px;
  color: var(--text-primary);
  font-weight: 500;
  margin-bottom: 4px;
}

.honor-issuer {
  font-size: 14px;
  color: var(--text-muted);
  font-family: var(--font-display);
  font-style: italic;
}

@media (max-width: 600px) {
  .honor-list li { grid-template-columns: 1fr; gap: 0.4rem; }
}



.fade-in {
  opacity: 0;
  transform: translateY(8px);
  animation: fadeUp 0.6s cubic-bezier(0.2, 0.7, 0.3, 1) forwards;
}

.fade-in:nth-child(1) { animation-delay: 0.05s; }
.fade-in:nth-child(2) { animation-delay: 0.12s; }
.fade-in:nth-child(3) { animation-delay: 0.19s; }
.fade-in:nth-child(4) { animation-delay: 0.26s; }
.fade-in:nth-child(5) { animation-delay: 0.33s; }
.fade-in:nth-child(6) { animation-delay: 0.4s; }

@keyframes fadeUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 600px) {
  .container { padding: 0 1.25rem; }
  .nav-inner { padding: 0.85rem 1.25rem; }
  .nav-links { gap: 1rem; }
  .nav-links a { font-size: 12px; }
  .footer-inner { padding: 0 1.25rem; flex-direction: column; gap: 0.75rem; }
  .hero h1 { font-size: 32px; }
  h1 { font-size: 30px; }
  .entry { grid-template-columns: 60px 1fr; gap: 1rem; }
  .cv-item { grid-template-columns: 1fr; gap: 0.4rem; }
  main { padding: 2.5rem 0 3.5rem; }
}