/* ============================================================
   DESIGN SYSTEM — Engineering Portfolio
   ============================================================ */

:root {
  --bg:          #0A0E17;
  --bg-card:     #0F1421;
  --bg-elevated: #141926;
  --border:      rgba(255, 255, 255, 0.07);
  --border-hover:rgba(56, 189, 248, 0.3);

  --accent:      #38BDF8;
  --accent-dim:  rgba(56, 189, 248, 0.12);
  --accent-glow: rgba(56, 189, 248, 0.25);

  --indigo:      #818CF8;
  --indigo-dim:  rgba(129, 140, 248, 0.12);

  --text:        #E2E8F0;
  --text-muted:  #64748B;
  --text-subtle: #94A3B8;

  --gradient:    linear-gradient(135deg, #38BDF8, #818CF8);

  --radius-sm:   8px;
  --radius-md:   12px;
  --radius-lg:   20px;

  --shadow-card: 0 1px 3px rgba(0,0,0,0.4), 0 8px 32px rgba(0,0,0,0.3);
  --shadow-glow: 0 0 40px rgba(56, 189, 248, 0.08);

  --transition:  all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light Theme */
[data-theme="light"] {
  --bg:          #F8FAFC;
  --bg-card:     #FFFFFF;
  --bg-elevated: #F1F5F9;
  --border:      rgba(0, 0, 0, 0.08);
  --border-hover:rgba(56, 189, 248, 0.4);
  --text:        #0F172A;
  --text-muted:  #64748B;
  --text-subtle: #475569;
  --shadow-card: 0 1px 3px rgba(0,0,0,0.06), 0 8px 32px rgba(0,0,0,0.06);
}

/* Electric Theme */
[data-theme="electric"] {
  --bg:          #050B14;
  --bg-card:     #091018;
  --bg-elevated: #0D1620;
  --accent:      #00E5FF;
  --accent-dim:  rgba(0, 229, 255, 0.1);
  --indigo:      #A78BFA;
  --gradient:    linear-gradient(135deg, #00E5FF, #A78BFA);
}

/* ============================================================
   RESET & BASE
   ============================================================ */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: 'Inter', 'Segoe UI', system-ui, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
  max-width: 100vw;
  transition: background-color 0.3s ease, color 0.3s ease;
  -webkit-font-smoothing: antialiased;
}

html, body {
  overflow-x: hidden;
}

/* Subtle grid dot pattern */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: radial-gradient(rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 32px 32px;
  z-index: -1;
  pointer-events: none;
}

[data-theme="light"] body::before {
  background-image: radial-gradient(rgba(0,0,0,0.04) 1px, transparent 1px);
}

/* ============================================================
   HEADER & NAVIGATION
   ============================================================ */
header {
  position: fixed;
  width: 100%;
  top: 0;
  z-index: 1000;
  background: rgba(10, 14, 23, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}

[data-theme="light"] header {
  background: rgba(248, 250, 252, 0.85);
}

.navbar {
  padding: 0.85rem 0;
}

.navbar-nav {
  flex-wrap: nowrap !important;
  align-items: center;
}

.navbar-brand {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--text) !important;
  letter-spacing: -0.02em;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}

.navbar-brand::before {
  content: '⬡';
  color: var(--accent);
  font-size: 1rem;
}

.nav-link {
  color: var(--text-subtle) !important;
  font-weight: 500;
  font-size: 0.78rem;
  margin: 0;
  padding: 0.38rem 0.38rem !important;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  letter-spacing: 0.005em;
  white-space: nowrap;
}

.nav-link:hover {
  color: var(--text) !important;
  background: var(--border);
}

.nav-link::after { display: none; }

.navbar-toggler {
  border: 1px solid var(--border);
  color: var(--text-subtle);
  padding: 0.4rem 0.6rem;
  border-radius: var(--radius-sm);
}

.navbar-toggler:focus { box-shadow: none; }

/* Theme Switcher */
.theme-switcher {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  margin-left: 1rem;
  padding: 0.25rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}

.theme-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 0.85rem;
  cursor: pointer;
  transition: var(--transition);
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
}

.theme-btn:hover {
  color: var(--text);
  background: var(--border);
}

.theme-btn.active {
  background: var(--accent-dim);
  color: var(--accent);
}

/* ============================================================
   SECTION UTILITIES
   ============================================================ */
section {
  padding: 6rem 0;
}

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

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.section-label::before {
  content: '';
  display: inline-block;
  width: 20px;
  height: 1px;
  background: var(--accent);
}

.section-header h2 {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
  color: var(--text);
  margin-bottom: 0.75rem;
}

.section-header p {
  color: var(--text-subtle);
  font-size: 1rem;
  max-width: 560px;
  line-height: 1.7;
}

.section-header.centered {
  text-align: center;
}

.section-header.centered .section-label {
  justify-content: center;
}

.section-header.centered .section-label::before {
  display: none;
}

.section-header.centered p {
  margin: 0 auto;
}

/* Alternating section backgrounds */
.projects, .spotlight, .contact { background: var(--bg); }
.stats, .articles, .skills, .achievements, .positions, .media { background: var(--bg-card); }

/* ============================================================
   HERO SECTION
   ============================================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 80px;
  position: relative;
  overflow: hidden;
  background: var(--bg);
}

.hero::before {
  content: '';
  position: absolute;
  top: -20%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.06) 0%, transparent 70%);
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -20%;
  left: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(129, 140, 248, 0.05) 0%, transparent 70%);
  pointer-events: none;
}

.hero-content {
  max-width: 780px;
  position: relative;
  z-index: 1;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid var(--border-hover);
  background: var(--accent-dim);
  padding: 0.4rem 1rem;
  border-radius: 999px;
  margin-bottom: 1.5rem;
}

.hero-eyebrow-dot {
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
  animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}

.hero h1 {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-size: clamp(2.6rem, 6vw, 4.2rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.05;
  margin-bottom: 1rem;
  color: var(--text);
}

.hero h1 .accent-text {
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero .typewriter {
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 1.05rem;
  margin-bottom: 1.5rem;
  min-height: 1.8rem;
  color: var(--text-subtle);
  letter-spacing: 0.01em;
}

.hero .typewriter span::after {
  content: '|';
  color: var(--accent);
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

.hero p {
  font-size: 1.05rem;
  margin-bottom: 2.5rem;
  color: var(--text-subtle);
  line-height: 1.75;
  max-width: 580px;
}

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.875rem;
  align-items: center;
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn-primary {
  background: var(--accent);
  color: #0A0E17 !important;
  border: none;
  padding: 0.7rem 1.6rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.9rem;
  transition: var(--transition);
  letter-spacing: 0.01em;
}

.btn-primary:hover {
  background: #7DD3FC;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px var(--accent-glow);
}

.btn-outline-light {
  border: 1px solid var(--border);
  color: var(--text-subtle) !important;
  background: transparent;
  padding: 0.7rem 1.6rem;
  border-radius: var(--radius-sm);
  font-weight: 500;
  font-size: 0.9rem;
  transition: var(--transition);
}

.btn-outline-light:hover {
  border-color: var(--border-hover);
  color: var(--text) !important;
  background: var(--accent-dim);
  transform: translateY(-2px);
}

.btn-resume {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  border: 1px solid var(--border);
  color: var(--text-subtle) !important;
  background: var(--bg-elevated);
  padding: 0.7rem 1.6rem;
  border-radius: var(--radius-sm);
  font-weight: 500;
  font-size: 0.9rem;
  transition: var(--transition);
  text-decoration: none;
}

.btn-resume:hover {
  border-color: var(--border-hover);
  color: var(--accent) !important;
  transform: translateY(-2px);
}

/* ============================================================
   STATS SECTION
   ============================================================ */
.stats {
  padding: 4rem 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
}

.stat-box {
  text-align: center;
  padding: 2.5rem 2rem;
  border-right: 1px solid var(--border);
  transition: var(--transition);
  position: relative;
}

.stat-box:last-child {
  border-right: none;
}

.stat-box:hover {
  background: var(--bg-elevated);
}

.stat-number {
  font-family: 'Space Grotesk', monospace;
  font-size: 2.8rem;
  font-weight: 700;
  letter-spacing: -0.04em;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 0.5rem;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  letter-spacing: 0.03em;
  font-weight: 500;
  text-transform: uppercase;
}

/* ============================================================
   PROJECTS SECTION
   ============================================================ */
.project-carousel {
  position: relative;
  overflow: hidden;
  padding: 0 52px;
}

.project-track {
  display: flex;
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.project-slide {
  min-width: 33.333%;
  padding: 0 10px;
}

@media (max-width: 992px) {
  .project-slide { min-width: 50%; }
}

@media (max-width: 768px) {
  .project-slide { min-width: 100%; }
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition-slow);
  height: 100%;
  position: relative;
}

.project-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient);
  opacity: 0;
  transition: var(--transition);
  z-index: 0;
  border-radius: var(--radius-md);
}

.project-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-6px);
  box-shadow: var(--shadow-card), var(--shadow-glow);
}

.project-img {
  height: 190px;
  overflow: hidden;
  position: relative;
}

.project-img::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, transparent 60%, rgba(10,14,23,0.8));
}

.project-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  filter: saturate(0.85);
}

.project-card:hover .project-img img {
  transform: scale(1.06);
  filter: saturate(1);
}

.project-content {
  padding: 1.4rem;
  position: relative;
  z-index: 1;
}

.project-content h4 {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 0.75rem;
  line-height: 1.4;
  color: var(--text);
}

.project-content p {
  font-size: 0.83rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 0;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0.75rem 0;
}

.project-tag {
  font-family: 'JetBrains Mono', monospace;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text-subtle);
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.02em;
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 600;
  text-decoration: none;
  margin-top: 0.875rem;
  transition: var(--transition);
  letter-spacing: 0.02em;
}

.project-link:hover {
  gap: 0.6rem;
  color: var(--accent);
}

.project-link i {
  font-size: 0.7rem;
  transition: var(--transition);
}

.carousel-button {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text-subtle);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  transition: var(--transition);
  cursor: pointer;
  font-size: 0.8rem;
}

.carousel-button:hover {
  background: var(--accent-dim);
  border-color: var(--border-hover);
  color: var(--accent);
}

.carousel-button--left { left: 0; }
.carousel-button--right { right: 0; }

/* ============================================================
   ARTICLES SECTION
   ============================================================ */
.article-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition-slow);
  height: 100%;
}

.article-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-5px);
  box-shadow: var(--shadow-card);
}

.article-img {
  height: 190px;
  overflow: hidden;
}

.article-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  filter: saturate(0.85);
}

.article-card:hover .article-img img {
  transform: scale(1.05);
  filter: saturate(1);
}

.article-content {
  padding: 1.4rem;
}

.article-content h4 {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  letter-spacing: -0.01em;
  line-height: 1.4;
}

.article-content p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.65;
}

.article-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 600;
  text-decoration: none;
  margin-top: 0.875rem;
  transition: var(--transition);
}

.article-link:hover {
  gap: 0.6rem;
  color: var(--accent);
}

/* ============================================================
   SKILLS SECTION
   ============================================================ */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 1rem;
}

.skill-item {
  text-align: center;
  padding: 1.5rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg);
  transition: var(--transition);
  cursor: default;
}

.skill-item:hover {
  border-color: var(--border-hover);
  background: var(--accent-dim);
  transform: translateY(-4px);
}

.skill-icon {
  font-size: 1.8rem;
  margin-bottom: 0.75rem;
  color: var(--text-muted);
  transition: var(--transition);
  display: block;
}

.skill-item:hover .skill-icon {
  color: var(--accent);
}

.skill-name {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-subtle);
  letter-spacing: 0.02em;
  transition: var(--transition);
}

.skill-item:hover .skill-name {
  color: var(--accent);
}

/* ============================================================
   ACHIEVEMENTS SECTION
   ============================================================ */
.achievement-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 2rem 1.75rem;
  transition: var(--transition-slow);
  height: 100%;
  position: relative;
  overflow: hidden;
}

.achievement-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient);
  opacity: 0;
  transition: var(--transition);
}

.achievement-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-5px);
  box-shadow: var(--shadow-card);
}

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

.achievement-icon {
  width: 48px;
  height: 48px;
  background: var(--accent-dim);
  border: 1px solid var(--border-hover);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  color: var(--accent);
  margin-bottom: 1.25rem;
}

.achievement-title {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-weight: 600;
  font-size: 1rem;
  margin-bottom: 0.75rem;
  letter-spacing: -0.01em;
  color: var(--text);
}

.achievement-desc {
  color: var(--text-muted);
  font-size: 0.85rem;
  line-height: 1.65;
  margin-bottom: 1.25rem;
}

.achievement-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--indigo);
  background: var(--indigo-dim);
  border: 1px solid rgba(129, 140, 248, 0.2);
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
}

/* ============================================================
   PATENTS SECTION
   ============================================================ */
.patents { background: var(--bg); }

.patents-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  max-width: 860px;
  margin: 0 auto;
}

.patent-card {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.75rem 2rem;
  transition: var(--transition-slow);
  position: relative;
  overflow: hidden;
}

.patent-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--gradient);
  opacity: 0;
  transition: var(--transition);
}

.patent-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
}

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

.patent-icon {
  flex-shrink: 0;
  width: 52px;
  height: 52px;
  background: var(--accent-dim);
  border: 1px solid var(--border-hover);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  color: var(--accent);
  margin-top: 0.15rem;
}

.patent-body { flex: 1; min-width: 0; }

.patent-status {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  padding: 0.25rem 0.7rem;
  border-radius: 999px;
  margin-bottom: 0.85rem;
}

.patent-status.published {
  color: #34d399;
  background: rgba(52, 211, 153, 0.1);
  border: 1px solid rgba(52, 211, 153, 0.25);
}

.patent-status.pending {
  color: #fbbf24;
  background: rgba(251, 191, 36, 0.1);
  border: 1px solid rgba(251, 191, 36, 0.25);
}

.patent-title {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-weight: 700;
  font-size: 0.95rem;
  line-height: 1.5;
  letter-spacing: -0.01em;
  color: var(--text);
  margin-bottom: 0.75rem;
  text-transform: uppercase;
}

.patent-desc {
  color: var(--text-muted);
  font-size: 0.85rem;
  line-height: 1.7;
  margin-bottom: 1rem;
}

.patent-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
}

.patent-meta span {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.patent-meta span i {
  color: var(--accent);
  font-size: 0.72rem;
}

/* Light / electric theme tweaks */
[data-theme="light"] .patent-card { background: var(--bg-card); }
[data-theme="electric"] .patent-status.published { color: #4ade80; background: rgba(74, 222, 128, 0.12); }

/* ============================================================
   POSITIONS / EXPERIENCE SECTION
   ============================================================ */
.position-box {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  margin-bottom: 1rem;
  transition: var(--transition);
}

.position-box:hover {
  border-color: var(--border-hover);
  transform: translateX(4px);
}

.position-img {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  flex-shrink: 0;
  border: 1px solid var(--border);
}

.position-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.position-info h4 {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
  letter-spacing: -0.01em;
  color: var(--text);
}

.position-info p {
  color: var(--text-muted);
  font-size: 0.83rem;
  margin: 0;
}

/* ============================================================
   SPOTLIGHT SECTION
   ============================================================ */
.video-container {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-card);
}

.video-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
}

/* ============================================================
   MEDIA COVERAGE SECTION
   ============================================================ */
.media-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition-slow);
  height: 100%;
}

.media-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-5px);
  box-shadow: var(--shadow-card);
}

.media-img {
  height: 190px;
  overflow: hidden;
}

.media-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  filter: saturate(0.85);
}

.media-card:hover .media-img img {
  transform: scale(1.05);
  filter: saturate(1);
}

.media-content {
  padding: 1.4rem;
}

.media-content h4 {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  letter-spacing: -0.01em;
  line-height: 1.4;
}

.media-content p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.65;
}

.media-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 600;
  text-decoration: none;
  margin-top: 0.875rem;
  transition: var(--transition);
}

.media-link:hover {
  gap: 0.6rem;
}

/* ============================================================
   CONTACT SECTION
   ============================================================ */
.contact-form {
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 2.5rem;
  border-radius: var(--radius-lg);
}

.form-label {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.form-control {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  transition: var(--transition);
}

.form-control:focus {
  background: var(--bg-elevated);
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-dim);
  color: var(--text);
  outline: none;
}

.form-control::placeholder {
  color: var(--text-muted);
}

.form-control:hover {
  border-color: rgba(255,255,255,0.15);
}

[data-theme="light"] .form-control {
  background: #F8FAFC;
}

.contact-info {
  padding-left: 2rem;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 1.1rem 1.25rem;
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.contact-item:hover {
  border-color: var(--border-hover);
  transform: translateX(3px);
}

.contact-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--accent-dim);
  border: 1px solid var(--border-hover);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  color: var(--accent);
  flex-shrink: 0;
}

.contact-item h5 {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.2rem;
}

.contact-item p {
  font-size: 0.88rem;
  color: var(--text-subtle);
  margin: 0;
  line-height: 1.5;
}

.contact-map {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-top: 1rem;
  filter: grayscale(0.6) brightness(0.8);
  transition: var(--transition);
}

.contact-map:hover {
  filter: grayscale(0.2) brightness(0.9);
}

[data-theme="light"] .contact-map {
  filter: none;
}

/* ============================================================
   FOOTER
   ============================================================ */
footer {
  background: var(--bg-card);
  padding: 3rem 0 2rem;
  border-top: 1px solid var(--border);
}

.social-links {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  margin-bottom: 2rem;
}

.social-link {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  transition: var(--transition);
}

.social-link:hover {
  background: var(--accent-dim);
  border-color: var(--border-hover);
  color: var(--accent);
  transform: translateY(-3px);
}

.copyright {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.8rem;
  letter-spacing: 0.03em;
}

/* ============================================================
   BACK TO TOP
   ============================================================ */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 42px;
  height: 42px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  font-size: 0.85rem;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: var(--transition);
  z-index: 999;
}

.back-to-top:hover {
  background: var(--accent-dim);
  border-color: var(--border-hover);
  color: var(--accent);
}

.back-to-top.active {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* ============================================================
   ANIMATIONS
   ============================================================ */
.fade-in-up {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1),
              transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

.fade-in-up.visible {
  opacity: 1;
  transform: translateY(0);
}

.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }

/* ============================================================
   TRUSTED BY LOGOS
   ============================================================ */
.trusted-by {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.5rem;
  align-items: center;
  opacity: 0.5;
  filter: grayscale(1);
  transition: var(--transition);
}

.trusted-by:hover {
  opacity: 0.7;
}

.trusted-by img {
  height: 32px;
  object-fit: contain;
}

/* ============================================================
   RESPONSIVE — ALL BREAKPOINTS (Single clean source)
   ============================================================ */

/* ── Navbar collapse (< 992px) ─────────────────────────────── */
@media (max-width: 991px) {
  .navbar-collapse {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1rem;
    margin-top: 0.5rem;
    max-height: 80vh;
    overflow-y: auto;
  }

  [data-theme="light"] .navbar-collapse {
    background: #fff;
  }

  .navbar-nav {
    gap: 0.15rem;
  }

  .nav-link {
    padding: 0.55rem 0.75rem !important;
    font-size: 0.88rem;
    border-radius: var(--radius-sm);
  }

  .theme-switcher {
    margin-left: 0;
    margin-top: 0.75rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border);
    width: 100%;
    justify-content: flex-start;
    background: none;
    border-left: none;
    border-right: none;
    border-bottom: none;
    border-radius: 0;
  }

  .theme-btn {
    width: 38px;
    height: 38px;
    font-size: 0.95rem;
  }

  .navbar-toggler {
    background: var(--bg-elevated);
    padding: 0.45rem 0.65rem;
    border: 1px solid var(--border);
  }

  .navbar-toggler i {
    color: var(--text-subtle);
    font-size: 0.95rem;
  }
}

/* ── Tablet (≤ 992px) ──────────────────────────────────────── */
@media (max-width: 992px) {
  section { padding: 4rem 0; }

  .hero {
    padding-top: 90px;
    padding-bottom: 3rem;
  }

  .stats-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .contact-info {
    padding-left: 0;
    margin-top: 2rem;
  }
}

/* ── Mobile (≤ 768px) ──────────────────────────────────────── */
@media (max-width: 768px) {
  /* Base */
  section { padding: 3.5rem 0; }
  .container { padding-left: 1.1rem; padding-right: 1.1rem; }

  /* Section header */
  .section-header { margin-bottom: 2.25rem; }
  .section-header h2 { font-size: clamp(1.5rem, 7vw, 2rem); }
  .section-header p { font-size: 0.88rem; }

  /* Hero — centered column */
  .hero {
    padding-top: 80px;
    padding-bottom: 3rem;
    min-height: auto;
  }

  .hero-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    width: 100%;
  }

  .hero-eyebrow {
    align-self: center;
    font-size: 0.72rem;
    padding: 0.32rem 0.85rem;
  }

  .hero h1 {
    font-size: clamp(1.85rem, 9vw, 2.6rem);
    letter-spacing: -0.03em;
    text-align: center;
  }

  .hero .typewriter {
    font-size: 0.88rem;
    text-align: center;
  }

  .hero p {
    font-size: 0.92rem;
    text-align: center;
    margin-left: auto;
    margin-right: auto;
    max-width: 100%;
  }

  /* Hero buttons — stack vertically and center */
  .hero-buttons {
    flex-direction: column;
    align-items: center;
    width: 100%;
    gap: 0.7rem;
  }

  .hero-buttons .btn-primary,
  .hero-buttons .btn-outline-light,
  .hero-buttons .btn-resume {
    width: 100%;
    max-width: 300px;
    justify-content: center;
    text-align: center;
  }

  /* Stats */
  .stats { padding: 2.5rem 0; }

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

  .stat-box {
    border-right: none;
    border-bottom: 1px solid var(--border);
    padding: 1.4rem 1rem;
  }

  .stat-box:nth-child(odd) {
    border-right: 1px solid var(--border);
  }

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

  .stat-box:last-child:nth-child(odd) {
    grid-column: 1 / -1;
    border-right: none;
  }

  .stat-number { font-size: 2rem; }
  .stat-label { font-size: 0.78rem; }

  /* Project carousel */
  .project-carousel { padding: 0 36px; }
  .project-slide { min-width: 100%; }
  .carousel-button { width: 30px; height: 30px; font-size: 0.7rem; }

  /* Project card */
  .project-img { height: 170px; }
  .project-content { padding: 1.1rem; }
  .project-content h4 { font-size: 0.88rem; }

  /* Skills — 3 col on tablet/mobile */
  .skills .row > [class*="col-"] {
    flex: 0 0 33.333%;
    max-width: 33.333%;
    padding-left: 0.4rem;
    padding-right: 0.4rem;
  }

  .skill-item {
    padding: 1.2rem 0.6rem;
  }

  .skill-icon { font-size: 1.6rem; margin-bottom: 0.5rem; }
  .skill-name { font-size: 0.72rem; }

  /* Achievements */
  .achievement-card { padding: 1.5rem 1.1rem; }

  /* Patents */
  .patent-card { flex-direction: column; gap: 1rem; padding: 1.5rem 1.25rem; }
  .patent-icon { width: 44px; height: 44px; font-size: 1.2rem; }
  .patent-title { font-size: 0.88rem; }
  .patent-meta { gap: 0.85rem; }
  .achievement-icon { width: 42px; height: 42px; font-size: 1.1rem; }
  .achievement-title { font-size: 0.92rem; }
  .achievement-desc { font-size: 0.82rem; }
  .achievement-badge { font-size: 0.68rem; }

  /* Positions */
  .position-box {
    padding: 0.9rem 1rem;
    gap: 0.85rem;
  }

  .position-img { width: 44px; height: 44px; }
  .position-info h4 { font-size: 0.85rem; }
  .position-info p { font-size: 0.78rem; }

  /* Contact */
  .contact-form { padding: 1.5rem 1.1rem; border-radius: var(--radius-md); }

  /* Stack the Name + Email fields vertically */
  .contact-form .row > .col-md-6 {
    flex: 0 0 100%;
    max-width: 100%;
  }

  .contact-info { padding-left: 0; margin-top: 1.5rem; }
  .contact-item { padding: 0.85rem 1rem; }
  .contact-icon { width: 36px; height: 36px; font-size: 0.82rem; }

  /* Media / Article cards */
  .article-img,
  .media-img { height: 170px; }

  /* Footer */
  .social-links { gap: 0.55rem; }
  .social-link { width: 38px; height: 38px; font-size: 0.88rem; }

  /* Back to top */
  .back-to-top { bottom: 1.2rem; right: 1.2rem; width: 38px; height: 38px; }

  /* Prevent horizontal overflow */
  .project-track,
  .project-carousel,
  .navbar-collapse,
  .hero-content { max-width: 100%; }
  img { max-width: 100%; height: auto; }
  .project-img img,
  .article-img img,
  .media-img img { height: 100%; }
}

/* ── Small mobile (≤ 480px) ────────────────────────────────── */
@media (max-width: 480px) {
  section { padding: 2.75rem 0; }
  .container { padding-left: 0.9rem; padding-right: 0.9rem; }

  /* Navbar */
  .navbar-brand { font-size: 1rem; }
  .navbar { padding: 0.65rem 0; }

  /* Hero */
  .hero { padding-top: 72px; padding-bottom: 2.5rem; }
  .hero h1 { font-size: clamp(1.65rem, 10vw, 2rem); letter-spacing: -0.025em; }
  .hero .typewriter { font-size: 0.8rem; }
  .hero p { font-size: 0.85rem; }

  .hero-buttons .btn-primary,
  .hero-buttons .btn-outline-light,
  .hero-buttons .btn-resume {
    max-width: 100%;
    font-size: 0.85rem;
    padding: 0.65rem 1.2rem;
  }

  /* Stats */
  .stat-number { font-size: 1.8rem; }
  .stat-label { font-size: 0.72rem; }
  .stat-box { padding: 1.1rem 0.75rem; }

  /* Section header */
  .section-header h2 { font-size: clamp(1.35rem, 8vw, 1.75rem); }
  .section-label { font-size: 0.68rem; }

  /* Project carousel */
  .project-carousel { padding: 0 28px; }
  .project-img { height: 155px; }
  .project-tag { font-size: 0.65rem; padding: 0.15rem 0.45rem; }

  /* Skills — 2 cols on very small phones */
  .skills .row > [class*="col-"] {
    flex: 0 0 50%;
    max-width: 50%;
  }

  .skill-item { padding: 1rem 0.5rem; }
  .skill-icon { font-size: 1.4rem; }
  .skill-name { font-size: 0.68rem; }

  /* Achievement cards */
  .achievement-card { padding: 1.1rem 0.85rem; }

  /* Patents */
  .patent-card { padding: 1.1rem 0.85rem; gap: 0.85rem; }
  .patent-title { font-size: 0.82rem; }
  .patent-desc { font-size: 0.8rem; }

  /* Contact */
  .contact-form { padding: 1.1rem 0.85rem; }
  .contact-item { padding: 0.75rem 0.85rem; gap: 0.7rem; }
  .contact-icon { width: 32px; height: 32px; font-size: 0.78rem; }

  /* Article / media */
  .article-img, .media-img { height: 150px; }

  /* Footer */
  .social-link { width: 36px; height: 36px; }

  /* Back to top */
  .back-to-top { bottom: 1rem; right: 1rem; width: 34px; height: 34px; font-size: 0.75rem; }
}

/* ── Misc utilities ─────────────────────────────────────────── */
.text-accent { color: var(--accent); }
.monospace { font-family: 'JetBrains Mono', monospace; font-size: 0.85em; }

.view-all-row {
  display: flex;
  justify-content: center;
  margin-top: 2.5rem;
}

.section-divider {
  height: 1px;
  background: var(--border);
  margin: 0;
}

/* Scrolled header */
header.scrolled {
  background: rgba(10, 14, 23, 0.97);
  box-shadow: 0 1px 0 var(--border);
}

[data-theme="light"] header.scrolled {
  background: rgba(248, 250, 252, 0.98);
}