/* ========================
   main.css — Aref Abdala Portfolio
   Engineering Notebook Warm Theme
   ======================== */

@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:ital,wght@0,400;0,500;0,600;0,700;1,400&family=Source+Sans+Pro:ital,wght@0,300;0,400;0,600;0,700;1,400&family=JetBrains+Mono:wght@300;400;500&display=swap');

/* ========================
   1. CSS Custom Properties
   ======================== */
:root {
  --bg-primary:    #faf6f0;
  --bg-secondary:  #f0e8da;
  --bg-tertiary:   #e5d9c8;
  --accent-cyan:   #7a3f22;
  --accent-orange: #c47840;
  --text-primary:  #2a1c12;
  --text-secondary:#6b5040;
  --border-subtle: #d4c4b0;
  --border-accent: #7a3f2233;
  --success:       #4a7a4a;

  --font-heading: 'Cormorant Garamond', serif;
  --font-body:    'Source Sans Pro', sans-serif;
  --font-mono:    'JetBrains Mono', monospace;

  --nav-height:      64px;
  --section-padding: 80px 0;
  --radius:    8px;
  --radius-sm: 4px;
}

/* ========================
   2. Reset + Base
   ======================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

body.is-preload * {
  animation: none !important;
  transition: none !important;
}

a {
  color: var(--accent-cyan);
  text-decoration: none;
  transition: color 0.2s ease, opacity 0.2s ease;
}

a:hover { color: var(--text-primary); }

ul { list-style: none; }

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

/* ========================
   3. Background Texture
   ======================== */
body::before {
  content: '';
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background:
    radial-gradient(ellipse 60% 50% at 0% 0%,    rgba(122, 63, 34, 0.04) 0%, transparent 60%),
    radial-gradient(ellipse 50% 40% at 100% 100%, rgba(196, 120, 64, 0.04) 0%, transparent 60%);
  pointer-events: none;
  z-index: 0;
}

/* ========================
   4. Navigation
   ======================== */
#nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-height);
  z-index: 100;
  background: rgba(250, 246, 240, 0.94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
}

.nav-inner {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 48px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 32px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.nav-logo-text {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.1em;
  white-space: nowrap;
}

.nav-logo-text span { color: var(--accent-cyan); }

.nav-logo-img {
  height: 40px;
  width: auto;
  display: block;
  transition: opacity 0.2s ease;
}

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

.footer-logo {
  height: 32px;
  width: auto;
  opacity: 0.45;
  display: block;
  transition: opacity 0.2s ease;
}

.footer-logo:hover { opacity: 0.7; }

.nav-links {
  display: flex;
  justify-content: center;
  gap: 32px;
}

.nav-links a {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-secondary);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: color 0.2s ease;
}

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

.nav-cta {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  cursor: pointer;
  border: none;
  transition: all 0.2s ease;
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--border-accent);
  color: var(--accent-cyan);
}

.btn-outline:hover {
  background: rgba(122, 63, 34, 0.08);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

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

.btn-primary:hover {
  background: #5c2e18;
  color: var(--bg-primary);
}

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

.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  transition: all 0.2s ease;
}

/* ========================
   5. Container
   ======================== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 48px;
  position: relative;
  z-index: 1;
}

/* ========================
   6. Hero
   ======================== */
#intro {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--nav-height);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 64px;
  align-items: center;
  padding: 80px 0;
}

.hero-overline {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent-cyan);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.hero-name {
  font-family: var(--font-heading);
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 900;
  line-height: 1.1;
  color: var(--text-primary);
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.hero-role {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
  line-height: 1.6;
}

.hero-role strong { color: var(--accent-orange); }

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin-bottom: 36px;
}

.hero-meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-secondary);
}

a.hero-meta-item {
  color: var(--text-secondary);
  text-decoration: none;
}

a.hero-meta-item:hover {
  color: var(--accent-cyan);
}

.hero-meta-item i {
  color: var(--accent-cyan);
  font-size: 0.8rem;
}

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

/* Hero Stats Card */
.hero-stats-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  padding: 28px;
  position: relative;
  overflow: hidden;
}

.hero-stats-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-orange));
}

.stats-header {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-secondary);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 20px;
}

.stat-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 0;
  border-bottom: 1px solid var(--border-subtle);
}

.stat-row:last-of-type { border-bottom: none; }

.stat-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.stat-value {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--accent-cyan);
}

.badge-active {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.3);
  border-radius: 100px;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--success);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin: 16px 0;
}

.badge-active::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--success);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

.stats-downloads {
  display: flex;
  gap: 8px;
  margin-top: 16px;
}

.stats-downloads a {
  flex: 1;
  text-align: center;
  padding: 8px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: all 0.2s ease;
}

.stats-downloads a:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

/* ========================
   7. Section Headers
   ======================== */
section {
  padding: var(--section-padding);
  position: relative;
  z-index: 1;
}

.section-header { margin-bottom: 48px; }

.section-overline {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--accent-cyan);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.section-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 600px;
}

/* ========================
   8. Experience Timeline
   ======================== */
#experience { border-top: 1px solid var(--border-subtle); }

.timeline {
  display: flex;
  flex-direction: column;
}

.timeline-item {
  display: grid;
  grid-template-columns: 1fr 160px;
  gap: 32px;
  padding: 24px 0;
  border-bottom: 1px solid var(--border-subtle);
  transition: background 0.2s ease;
}

.timeline-item:hover { background: rgba(122, 63, 34, 0.04); }
.timeline-item:last-child { border-bottom: none; }

.timeline-date {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-secondary);
  line-height: 1.7;
  order: 2;
  text-align: right;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 6px;
}

.timeline-content {
  display: flex;
  flex-direction: column;
  gap: 8px;
  order: 1;
}

.timeline-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}

.timeline-company {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: 0.05em;
}

.timeline-role {
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-style: italic;
}

.badge-current {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 2px 8px;
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.3);
  border-radius: 100px;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--success);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  white-space: nowrap;
}

.badge-current::before {
  content: '';
  width: 5px;
  height: 5px;
  background: var(--success);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

.timeline-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.timeline-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 4px;
}

.tag {
  padding: 2px 8px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: 100px;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.tag-accent {
  border-color: var(--border-accent);
  color: var(--accent-cyan);
  background: rgba(122, 63, 34, 0.06);
}

.timeline-link {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent-cyan);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-top: 4px;
  transition: gap 0.2s ease;
}

.timeline-link:hover {
  gap: 8px;
  color: var(--accent-cyan);
}

/* ========================
   9. Project Cards
   ======================== */
#projects { border-top: 1px solid var(--border-subtle); }

.projects-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.project-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  padding: 28px;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.project-card::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius);
  border: 1px solid transparent;
  transition: border-color 0.3s ease;
  pointer-events: none;
}

.project-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 48px rgba(122, 63, 34, 0.12);
}

.project-card:hover::after { border-color: var(--border-accent); }

.project-card.featured {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 32px;
  align-items: start;
}

.project-overline {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--accent-orange);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.project-title {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 12px;
  letter-spacing: 0.03em;
}

.project-card.featured .project-title { font-size: 1.2rem; }

.project-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 16px;
}

.project-link {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent-cyan);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: gap 0.2s ease;
}

.project-link:hover { gap: 8px; }

/* Featured metrics grid */
.metrics-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  min-width: 200px;
}

.metric-item {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 14px;
  text-align: center;
}

.metric-value {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 600;
  color: var(--accent-cyan);
  margin-bottom: 4px;
}

.metric-label {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.project-image {
  width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
  border: 1px solid var(--border-subtle);
}

/* ========================
   10. Skills
   ======================== */
#skills { border-top: 1px solid var(--border-subtle); }

.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.skill-group {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  padding: 24px;
}

.skill-group-title {
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent-cyan);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-subtle);
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.skill-tag {
  padding: 4px 10px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: 100px;
  font-size: 0.8rem;
  color: var(--text-secondary);
  transition: all 0.2s ease;
}

.skill-tag:hover {
  border-color: var(--border-accent);
  color: var(--accent-cyan);
}

/* ========================
   11. Publications
   ======================== */
#publications { border-top: 1px solid var(--border-subtle); }

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

.publication-item {
  display: grid;
  grid-template-columns: 60px 1fr auto;
  gap: 24px;
  align-items: start;
  padding: 20px 0;
  border-bottom: 1px solid var(--border-subtle);
  transition: background 0.2s ease;
}

.publication-item:hover { background: rgba(122, 63, 34, 0.04); }
.publication-item:last-child { border-bottom: none; }

.pub-year {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-cyan);
  font-weight: 500;
  padding-top: 2px;
}

.pub-title {
  font-size: 0.95rem;
  color: var(--text-primary);
  line-height: 1.5;
  margin-bottom: 4px;
}

.pub-venue {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-secondary);
}

.pub-badge {
  padding: 3px 8px;
  background: rgba(122, 63, 34, 0.07);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--accent-cyan);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  white-space: nowrap;
}

/* ========================
   12. Awards / Scholarships
   ======================== */
#awards { border-top: 1px solid var(--border-subtle); }

.awards-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.award-list, .presentations-list {
  display: flex;
  flex-direction: column;
}

.award-item, .presentation-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 0;
  border-bottom: 1px solid var(--border-subtle);
}

.award-item:last-child,
.presentation-item:last-child { border-bottom: none; }

.award-name, .presentation-name {
  font-size: 0.9rem;
  color: var(--text-primary);
}

.award-year {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent-cyan);
  white-space: nowrap;
  margin-left: 16px;
}

.presentation-year {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-secondary);
  white-space: nowrap;
  margin-left: 16px;
}

/* ========================
   13. Contact
   ======================== */
#contact { border-top: 1px solid var(--border-subtle); }

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.contact-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  padding: 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  transition: all 0.2s ease;
  text-decoration: none;
  color: inherit;
}

.contact-card:hover {
  border-color: var(--border-accent);
  background: rgba(122, 63, 34, 0.05);
  transform: translateX(4px);
  color: inherit;
}

.contact-icon {
  width: 40px;
  height: 40px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-cyan);
  font-size: 1rem;
  flex-shrink: 0;
}

.contact-info { flex: 1; }

.contact-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 4px;
}

.contact-value {
  font-size: 0.9rem;
  color: var(--text-primary);
}

.contact-arrow {
  color: var(--text-secondary);
  font-size: 0.8rem;
  transition: transform 0.2s ease, color 0.2s ease;
}

.contact-card:hover .contact-arrow {
  transform: translateX(4px);
  color: var(--accent-cyan);
}

/* ========================
   14. Footer
   ======================== */
footer {
  border-top: 1px solid var(--border-subtle);
  padding: 24px 0;
  position: relative;
  z-index: 1;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-copy {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-secondary);
}

/* ========================
   15. Detail Pages
   ======================== */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-secondary);
  margin-bottom: 40px;
  padding-top: calc(var(--nav-height) + 40px);
}

.breadcrumb a { color: var(--accent-cyan); }
.breadcrumb a:hover { color: var(--text-primary); }
.breadcrumb-sep { color: var(--border-subtle); }

.detail-header { margin-bottom: 48px; }

.detail-company {
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.detail-role {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.detail-date {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-cyan);
  margin-bottom: 16px;
}

.detail-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.detail-body {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 48px;
  margin-bottom: 60px;
}

.detail-content h3 {
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent-cyan);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin: 28px 0 16px;
}

.detail-content h3:first-child { margin-top: 0; }

.detail-content ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.detail-content ul li {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
  padding-left: 16px;
  position: relative;
}

.detail-content ul li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--accent-cyan);
  font-size: 0.7rem;
  top: 4px;
}

.detail-content p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
}

.sidebar-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  padding: 24px;
  position: sticky;
  top: calc(var(--nav-height) + 24px);
  height: fit-content;
}

.sidebar-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-cyan), transparent);
  border-radius: var(--radius) var(--radius) 0 0;
}

.sidebar-title {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: 16px;
}

.sidebar-stats { display: flex; flex-direction: column; }

.sidebar-stat {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 0;
  border-bottom: 1px solid var(--border-subtle);
}

.sidebar-stat:last-child { border-bottom: none; }

.sidebar-stat-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.sidebar-stat-value {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-cyan);
  font-weight: 500;
}

.detail-image {
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border-subtle);
  margin-bottom: 48px;
}

.detail-placeholder {
  width: 100%;
  height: 260px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 48px;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.detail-placeholder i {
  font-size: 2rem;
  color: var(--border-subtle);
}

/* ========================
   16. Responsive — 1024px
   ======================== */
@media (max-width: 1024px) {
  .container,
  .nav-inner { padding: 0 32px; }

  .hero-grid {
    grid-template-columns: 1fr 320px;
    gap: 40px;
  }

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

  .project-card.featured { grid-template-columns: 1fr; }

  .metrics-grid { grid-template-columns: repeat(4, 1fr); }
}

/* ========================
   17. Responsive — 768px
   ======================== */
@media (max-width: 768px) {
  :root { --section-padding: 56px 0; }

  .container,
  .nav-inner { padding: 0 20px; }

  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0; right: 0;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-subtle);
    padding: 20px;
    flex-direction: column;
    align-items: center;
    gap: 16px;
  }

  .nav-open .nav-links { display: flex; }
  .nav-hamburger { display: flex; }
  .nav-cta .btn-outline { display: none; }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
    padding: 56px 0;
  }

  .timeline-item { grid-template-columns: 1fr; gap: 8px; }

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

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

  .project-card.featured { grid-column: 1; }

  .publication-item { grid-template-columns: 1fr; gap: 8px; }

  .awards-grid { grid-template-columns: 1fr; gap: 32px; }

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

  .detail-body { grid-template-columns: 1fr; }

  .sidebar-card { position: static; }

  .footer-inner {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
}

/* ========================
   Utility / Animations
   ======================== */
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.4; }
}

.text-cyan   { color: var(--accent-cyan); }
.text-orange { color: var(--accent-orange); }
.text-muted  { color: var(--text-secondary); }