@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800;900&display=swap');

/* --- Modern CSS Custom Properties & Design System --- */
:root {
  /* Common variables */
  --font-display: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-body: 'Inter', system-ui, -apple-system, sans-serif;
  --transition-smooth: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --glow-radius: 20px;
  
  /* Obsidian Space (Dark Mode - Default) */
  --bg: #06050b;
  --surface: rgba(14, 12, 22, 0.45);
  --surface-border: rgba(255, 255, 255, 0.08);
  --surface-glow: rgba(255, 50, 75, 0.15);
  --card-bg: rgba(20, 18, 28, 0.4);
  --card-hover-bg: rgba(30, 26, 42, 0.6);
  --card-border: rgba(255, 255, 255, 0.05);
  --card-border-hover: rgba(255, 50, 75, 0.3);
  
  --accent: #ff3344;
  --accent-rgb: 255, 51, 68;
  --accent-secondary: #ff8833;
  --accent-secondary-rgb: 255, 136, 51;
  --gold: #ffaa00;
  --text: #f4f3f6;
  --text-muted: #a3a0b0;
  --text-dim: #737080;
  --nav-bg: rgba(6, 5, 11, 0.7);
  
  --tag-bg: rgba(255, 51, 68, 0.08);
  --tag-border: rgba(255, 51, 68, 0.15);
  --tag-text: #ff5566;
  
  --tag-bg-gold: rgba(255, 170, 0, 0.08);
  --tag-border-gold: rgba(255, 170, 0, 0.15);
  --tag-text-gold: #ffbb22;

  --tag-bg-blue: rgba(0, 170, 255, 0.08);
  --tag-border-blue: rgba(0, 170, 255, 0.15);
  --tag-text-blue: #33bbff;
  
  --tag-bg-green: rgba(34, 197, 94, 0.08);
  --tag-border-green: rgba(34, 197, 94, 0.15);
  --tag-text-green: #4ade80;

  --shadow-color: rgba(0, 0, 0, 0.5);
  --glow-shadow: 0 0 30px rgba(255, 51, 68, 0.25);
  --glow-secondary: 0 0 30px rgba(255, 170, 0, 0.2);
}

/* Solar Flare (Light Mode) */
body.light-theme {
  --bg: #f9f8fa;
  --surface: rgba(255, 255, 255, 0.65);
  --surface-border: rgba(0, 0, 0, 0.06);
  --surface-glow: rgba(230, 80, 40, 0.06);
  --card-bg: rgba(255, 255, 255, 0.7);
  --card-hover-bg: rgba(255, 255, 255, 0.95);
  --card-border: rgba(0, 0, 0, 0.04);
  --card-border-hover: rgba(230, 80, 40, 0.2);
  
  --accent: #d63031;
  --accent-rgb: 214, 48, 49;
  --accent-secondary: #e67e22;
  --accent-secondary-rgb: 230, 126, 34;
  --gold: #d68f00;
  --text: #1d1b24;
  --text-muted: #625f6e;
  --text-dim: #8e8b9a;
  --nav-bg: rgba(249, 248, 252, 0.75);
  
  --tag-bg: rgba(214, 48, 49, 0.06);
  --tag-border: rgba(214, 48, 49, 0.12);
  --tag-text: #c0392b;
  
  --tag-bg-gold: rgba(214, 143, 0, 0.06);
  --tag-border-gold: rgba(214, 143, 0, 0.12);
  --tag-text-gold: #b37400;

  --tag-bg-blue: rgba(20, 110, 200, 0.06);
  --tag-border-blue: rgba(20, 110, 200, 0.12);
  --tag-text-blue: #0f62b3;

  --tag-bg-green: rgba(21, 128, 61, 0.06);
  --tag-border-green: rgba(21, 128, 61, 0.12);
  --tag-text-green: #15803d;

  --shadow-color: rgba(0, 0, 0, 0.05);
  --glow-shadow: 0 10px 30px rgba(214, 48, 49, 0.1);
  --glow-secondary: 0 10px 30px rgba(230, 126, 34, 0.08);
}

/* --- Base Styles --- */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  scroll-behavior: smooth;
}

body {
  background: var(--bg);
  background-image: 
    radial-gradient(circle at 10% 20%, rgba(var(--accent-rgb), 0.05) 0%, transparent 45%),
    radial-gradient(circle at 90% 80%, rgba(var(--accent-secondary-rgb), 0.04) 0%, transparent 45%);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.6;
  overflow-x: hidden;
  transition: background 0.8s ease, color 0.5s ease;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 10px;
}
::-webkit-scrollbar-track {
  background: var(--bg);
}
::-webkit-scrollbar-thumb {
  background: rgba(120, 120, 150, 0.15);
  border-radius: 5px;
  border: 2px solid var(--bg);
  transition: var(--transition-fast);
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(120, 120, 150, 0.35);
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* --- Premium Glassmorphic Layouts --- */
.glass-panel {
  background: var(--surface);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--surface-border);
  border-radius: 24px;
  box-shadow: 0 20px 50px var(--shadow-color);
  transition: var(--transition-smooth);
}

/* --- Navigation Bar --- */
nav {
  position: fixed;
  top: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  width: calc(100% - 4rem);
  max-width: 1200px;
  height: 4.5rem;
  z-index: 1000;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 2.5rem;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text);
  font-family: var(--font-display);
}

.nav-logo-mark {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 14px;
  color: #fff;
  letter-spacing: 0.5px;
  box-shadow: var(--glow-shadow);
  transition: var(--transition-smooth);
}

.nav-logo:hover .nav-logo-mark {
  transform: rotate(10deg) scale(1.05);
}

.nav-logo-text {
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: -0.5px;
}

.nav-logo-text span {
  background: linear-gradient(to right, var(--accent), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 2.2rem;
  list-style: none;
}

.nav-menu a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 500;
  position: relative;
  padding: 0.5rem 0;
  transition: var(--transition-fast);
}

.nav-menu a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  transition: var(--transition-fast);
}

.nav-menu a:hover, .nav-menu a.active {
  color: var(--text);
}

.nav-menu a.active::after {
  transform: translateX(-50%) scaleX(1);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1.2rem;
}

.status-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  color: var(--text-muted);
  background: rgba(34, 197, 94, 0.08);
  border: 1px solid rgba(34, 197, 94, 0.15);
  border-radius: 30px;
  padding: 0.4rem 0.9rem;
  font-weight: 600;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #22c55e;
  box-shadow: 0 0 10px #22c55e;
  animation: pulse-green 2s infinite;
}

.nav-resume-btn {
  margin-bottom: 0;
  padding: 0.55rem 0.9rem;
  font-size: 0.78rem;
  white-space: nowrap;
}

/* Theme Toggle Button */
.theme-toggle-btn {
  background: rgba(120, 120, 150, 0.08);
  border: 1px solid var(--surface-border);
  color: var(--text);
  width: 40px;
  height: 40px;
  border-radius: 12px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  transition: var(--transition-smooth);
}

.theme-toggle-btn:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  box-shadow: var(--glow-shadow);
  transform: translateY(-2px);
}

.theme-toggle-btn i {
  transition: var(--transition-smooth);
}

.light-theme .theme-toggle-btn i {
  transform: rotate(360deg);
}

/* Mobile Toggle Hamburger */
.mobile-toggle {
  display: none;
  font-size: 1.5rem;
  color: var(--text);
  cursor: pointer;
  background: none;
  border: none;
  outline: none;
}

/* --- Section Formatting --- */
section {
  padding: 8rem 0 4rem 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.section-hdr {
  margin-bottom: 4rem;
  position: relative;
}

.section-tagline {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 3px;
  color: var(--accent);
  font-weight: 700;
  margin-bottom: 0.5rem;
  display: inline-block;
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-title {
  font-family: var(--font-display);
  font-size: 2.8rem;
  font-weight: 800;
  letter-spacing: -1px;
  line-height: 1.15;
}

/* --- Hero Section --- */
.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 3rem;
  align-items: center;
  height: 100%;
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  z-index: 10;
}

.hero-pretitle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-secondary);
  background: var(--tag-bg-gold);
  border: 1px solid var(--tag-border-gold);
  padding: 0.5rem 1.1rem;
  border-radius: 50px;
  margin-bottom: 1.5rem;
  letter-spacing: 0.5px;
}

.hero-pretitle i {
  font-size: 0.95rem;
}

.hero-title {
  font-family: var(--font-display);
  font-size: 4.8rem;
  font-weight: 900;
  letter-spacing: -2px;
  line-height: 1.05;
  margin-bottom: 1.2rem;
}

.hero-title span {
  background: linear-gradient(135deg, var(--accent) 20%, var(--accent-secondary) 80%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  position: relative;
}

.hero-desc {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 580px;
  line-height: 1.7;
  margin-bottom: 2.2rem;
  border-left: 3px solid var(--accent);
  padding-left: 1.2rem;
}

.hero-socials {
  display: flex;
  gap: 1rem;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
}

.social-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.75rem 1.4rem;
  border-radius: 14px;
  box-shadow: 0 4px 15px rgba(0,0,0,0.1);
  transition: var(--transition-smooth);
}

.social-btn:hover {
  background: var(--card-hover-bg);
  color: var(--text);
  border-color: var(--card-border-hover);
  transform: translateY(-4px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15), var(--glow-shadow);
}

.social-btn i {
  font-size: 1.1rem;
}

.social-btn.primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  color: #fff;
  border: none;
  box-shadow: var(--glow-shadow);
}

.social-btn.primary:hover {
  box-shadow: 0 15px 30px rgba(255, 51, 68, 0.45);
}

/* Stats Block */
.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  width: 100%;
}

.stat-item {
  padding: 1.4rem 1.8rem;
  display: flex;
  flex-direction: column;
}

.stat-num {
  font-family: var(--font-display);
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 0.4rem;
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-muted);
  font-weight: 700;
  margin-bottom: 0.2rem;
}

.stat-subtext {
  font-size: 0.72rem;
  color: var(--text-dim);
  line-height: 1.35;
}

/* Hero Canvas Hook for Geometry */
.hero-visual {
  width: 100%;
  height: 480px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.hero-3d-placeholder {
  pointer-events: none;
  width: 100%;
  height: 100%;
}

/* --- Skills Network --- */
.skills-container {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.skills-card {
  padding: 2.2rem;
}

.skills-group {
  margin-bottom: 2rem;
}

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

.skills-group-title {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--accent-secondary);
  margin-bottom: 1.2rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.skills-group-title::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--surface-border);
}

.tags-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.skill-tag {
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.5rem 1.1rem;
  border-radius: 12px;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  color: var(--text-muted);
  cursor: default;
  transition: var(--transition-fast);
  box-shadow: 0 4px 10px rgba(0,0,0,0.05);
}

.skill-tag:hover {
  transform: translateY(-3px);
  color: var(--text);
  background: var(--card-hover-bg);
  border-color: var(--accent);
  box-shadow: 0 10px 20px rgba(0,0,0,0.1), 0 0 15px rgba(var(--accent-rgb), 0.2);
}

.skill-tag.featured {
  background: var(--tag-bg);
  border-color: var(--tag-border);
  color: var(--tag-text);
}

.skill-tag.featured:hover {
  border-color: var(--accent);
  box-shadow: 0 10px 20px rgba(0,0,0,0.1), var(--glow-shadow);
}

.skill-tag.gold {
  background: var(--tag-bg-gold);
  border-color: var(--tag-border-gold);
  color: var(--tag-text-gold);
}

.skill-tag.gold:hover {
  border-color: var(--gold);
  box-shadow: 0 10px 20px rgba(0,0,0,0.1), var(--glow-secondary);
}

/* --- Projects Section --- */
.projects-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.2rem;
}

/* Realistic 3D Tilt Card */
.project-card {
  position: relative;
  padding: 2.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 350px;
  overflow: hidden;
  transform-style: preserve-3d;
  transform: perspective(1000px);
}

.project-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle 300px at var(--mouse-x, 0) var(--mouse-y, 0), rgba(255, 255, 255, 0.05), transparent 80%);
  pointer-events: none;
}

.project-card-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  transform: translateZ(30px);
}

.project-num {
  font-family: var(--font-display);
  font-size: 0.72rem;
  letter-spacing: 2px;
  color: var(--text-dim);
  font-weight: 700;
}

.project-badge {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.3rem 0.8rem;
  border-radius: 8px;
  border: 1px solid;
}

.badge-gold {
  border-color: var(--tag-border-gold);
  color: var(--tag-text-gold);
  background: var(--tag-bg-gold);
}

.badge-blue {
  border-color: var(--tag-border-blue);
  color: var(--tag-text-blue);
  background: var(--tag-bg-blue);
}

.badge-green {
  border-color: var(--tag-border-green);
  color: var(--tag-text-green);
  background: var(--tag-bg-green);
}

.badge-red {
  border-color: var(--tag-border);
  color: var(--tag-text);
  background: var(--tag-bg);
}

.project-title {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.8rem;
  letter-spacing: -0.5px;
  transform: translateZ(40px);
}

.project-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 1.8rem;
  transform: translateZ(25px);
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  transform: translateZ(35px);
}

.proj-tech-tag {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--accent-secondary);
  border: 1px solid var(--surface-border);
  background: rgba(120, 120, 150, 0.05);
  border-radius: 8px;
  padding: 0.25rem 0.65rem;
}

.project-card:hover {
  border-color: var(--card-border-hover);
  box-shadow: 0 30px 60px var(--shadow-color), 0 0 40px rgba(var(--accent-rgb), 0.1);
}

/* --- Blog Section --- */
.blog-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.blog-card {
  display: grid;
  grid-template-columns: 80px 1fr 180px;
  padding: 2rem 2.5rem;
  align-items: center;
  text-decoration: none;
  color: inherit;
  transition: var(--transition-smooth);
}

.blog-num {
  font-family: var(--font-display);
  font-size: 2.2rem;
  font-weight: 900;
  color: var(--text-dim);
  opacity: 0.3;
  transition: var(--transition-fast);
}

.blog-body {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  padding-right: 2rem;
}

.blog-category {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 0.6rem;
  padding: 0.25rem 0.65rem;
  border-radius: 6px;
}

.cat-red {
  color: var(--tag-text);
  background: var(--tag-bg);
  border: 1px solid var(--tag-border);
}

.cat-gold {
  color: var(--tag-text-gold);
  background: var(--tag-bg-gold);
  border: 1px solid var(--tag-border-gold);
}

.cat-blue {
  color: var(--tag-text-blue);
  background: var(--tag-bg-blue);
  border: 1px solid var(--tag-border-blue);
}

.blog-title {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.5rem;
  line-height: 1.3;
  transition: var(--transition-fast);
}

.blog-excerpt {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.55;
}

.blog-meta {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  justify-content: center;
  gap: 4px;
}

.blog-date {
  font-size: 0.78rem;
  color: var(--text-dim);
  font-weight: 500;
}

.blog-read-time {
  font-size: 0.72rem;
  color: var(--accent);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 4px;
}

.blog-card:hover {
  border-color: var(--card-border-hover);
  background: var(--card-hover-bg);
  transform: translateX(10px);
}

.blog-card:hover .blog-num {
  opacity: 0.8;
  color: var(--accent);
}

.blog-card:hover .blog-title {
  color: var(--accent-secondary);
}

/* --- Education Section --- */
.edu-card {
  padding: 3rem;
  display: grid;
  grid-template-columns: 1fr 1px 1.5fr;
  gap: 3rem;
  align-items: center;
}

.edu-left {
  display: flex;
  flex-direction: column;
}

.edu-institution {
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--text);
  line-height: 1.2;
  margin-bottom: 0.6rem;
}

.edu-loc {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--accent);
  font-weight: 700;
}

.edu-divider {
  height: 100px;
  background: var(--surface-border);
  width: 1px;
}

.edu-right {
  display: flex;
  flex-direction: column;
}

.edu-degree {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.5rem;
}

.edu-details {
  color: var(--text-muted);
  font-size: 0.88rem;
  line-height: 1.6;
}

/* --- Contact Portal --- */
.contact-grid {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 3rem;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.contact-info-card {
  padding: 1.8rem;
  display: flex;
  align-items: center;
  gap: 1.2rem;
}

.contact-icon-wrap {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--tag-bg);
  border: 1px solid var(--tag-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  color: var(--accent);
  box-shadow: 0 4px 10px rgba(0,0,0,0.05);
}

.contact-text {
  display: flex;
  flex-direction: column;
}

.contact-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-dim);
  font-weight: 700;
  margin-bottom: 0.2rem;
}

.contact-val {
  font-size: 0.95rem;
  color: var(--text);
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition-fast);
}

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

.contact-form {
  padding: 3rem;
}

.form-group-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.form-group {
  margin-bottom: 1.5rem;
  display: flex;
  flex-direction: column;
}

.form-label {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 0.5rem;
}

.form-input {
  background: rgba(120, 120, 150, 0.04);
  border: 1px solid var(--surface-border);
  border-radius: 12px;
  padding: 0.9rem 1.2rem;
  font-size: 0.88rem;
  color: var(--text);
  font-family: var(--font-body);
  outline: none;
  transition: var(--transition-fast);
}

.form-input:focus {
  border-color: var(--accent);
  background: rgba(120, 120, 150, 0.08);
  box-shadow: 0 0 15px rgba(var(--accent-rgb), 0.15);
}

.form-input::placeholder {
  color: var(--text-dim);
}

textarea.form-input {
  resize: vertical;
  min-height: 120px;
}

.form-btn {
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  color: #fff;
  border: none;
  border-radius: 12px;
  padding: 1rem 2rem;
  font-size: 0.88rem;
  font-weight: 700;
  cursor: pointer;
  letter-spacing: 0.5px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  box-shadow: var(--glow-shadow);
  transition: var(--transition-smooth);
}

.form-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 15px 30px rgba(255, 51, 68, 0.35);
}

.form-success-msg {
  display: none;
  font-size: 0.88rem;
  color: #22c55e;
  font-weight: 600;
  text-align: center;
  margin-top: 1.2rem;
  padding: 0.75rem;
  border-radius: 8px;
  background: rgba(34, 197, 94, 0.06);
  border: 1px solid rgba(34, 197, 94, 0.12);
  animation: pulse-green 2s infinite;
}

/* --- Footer --- */
footer {
  margin-top: 6rem;
  padding: 2.5rem 0;
  border-top: 1px solid var(--surface-border);
  background: var(--nav-bg);
  backdrop-filter: blur(10px);
}

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

.footer-left {
  font-size: 0.82rem;
  color: var(--text-dim);
}

.footer-right {
  font-family: var(--font-display);
  font-size: 0.78rem;
  color: var(--text-muted);
  letter-spacing: 1px;
  font-weight: 700;
}

.footer-right span {
  color: var(--accent);
}

/* --- Micro-Animations & Glow Effects --- */
@keyframes pulse-green {
  0% {
    box-shadow: 0 0 0 0 rgba(34, 197, 94, 0.4);
  }
  70% {
    box-shadow: 0 0 0 8px rgba(34, 197, 94, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(34, 197, 94, 0);
  }
}

/* Scroll Animation Hooks */
.reveal-up {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal-up.active {
  opacity: 1;
  transform: translateY(0);
}

/* --- Responsive Media Queries --- */
@media (max-width: 992px) {
  nav {
    width: calc(100% - 2rem);
    padding: 0 1.5rem;
  }
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
    text-align: center;
  }
  .hero-content {
    align-items: center;
  }
  .hero-desc {
    border-left: none;
    border-top: 3px solid var(--accent);
    padding-left: 0;
    padding-top: 1rem;
  }
  .hero-socials {
    justify-content: center;
  }
  .hero-visual {
    height: 380px;
    grid-row: 1;
  }
  .projects-grid {
    grid-template-columns: 1fr;
  }
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .edu-card {
    grid-template-columns: 1fr;
    gap: 1.5rem;
    text-align: center;
  }
  .edu-divider {
    height: 1px;
    width: 100%;
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 3.5rem;
  }
  .section-title {
    font-size: 2.2rem;
  }
  .nav-menu {
    position: fixed;
    top: 5rem;
    left: 1rem;
    width: calc(100% - 2rem);
    background: var(--nav-bg);
    backdrop-filter: blur(25px);
    border: 1px solid var(--surface-border);
    border-radius: 20px;
    flex-direction: column;
    padding: 2rem;
    gap: 1.5rem;
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: var(--transition-smooth);
    box-shadow: 0 20px 40px rgba(0,0,0,0.3);
  }
  .nav-menu.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .mobile-toggle {
    display: block;
  }
  .blog-card {
    grid-template-columns: 1fr;
    gap: 1rem;
    padding: 1.8rem;
  }
  .blog-meta {
    align-items: flex-start;
  }
  .form-group-row {
    grid-template-columns: 1fr;
    gap: 0;
  }
  .hero-stats {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  .stat-item {
    align-items: center;
    border-bottom: 1px solid var(--surface-border);
    padding-bottom: 1rem;
  }
  .stat-item:last-child {
    border-bottom: none;
  }
}

/* --- Custom Morphing Portrait Portal (Replacing 3D canvas model) --- */
/* --- Hero Portrait: Double Orbit Ring --- */
.hero-visual {
  width: 100%;
  height: 520px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.hero-image-portal {
  position: relative;
  width: 380px;
  height: 380px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Ambient glow behind everything */
.hero-image-glow {
  position: absolute;
  width: 140%;
  height: 140%;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(var(--accent-rgb), 0.18) 0%, transparent 65%);
  filter: blur(28px);
  z-index: 1;
  animation: orbit-glow-pulse 6s ease-in-out infinite;
}

body.light-theme .hero-image-glow {
  background: radial-gradient(circle, rgba(var(--accent-rgb), 0.08) 0%, transparent 65%);
}

@keyframes orbit-glow-pulse {
  0%, 100% { transform: scale(0.92); opacity: 0.6; }
  50%       { transform: scale(1.08); opacity: 1;   }
}

/* Outer orbit ring — spins clockwise, carries accent dot */
.hero-orbit-outer {
  position: absolute;
  width: 370px;
  height: 370px;
  border-radius: 50%;
  border: 1.5px solid rgba(var(--accent-rgb), 0.25);
  z-index: 2;
  animation: spin-cw 14s linear infinite;
}

/* Travelling accent dot on outer ring */
.hero-orbit-outer::before {
  content: '';
  position: absolute;
  top: -5px;
  left: 50%;
  transform: translateX(-50%);
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 12px var(--accent), 0 0 24px rgba(var(--accent-rgb), 0.5);
}

/* Trailing dot on opposite side of outer ring */
.hero-orbit-outer::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 50%;
  transform: translateX(-50%);
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-secondary);
  box-shadow: 0 0 8px var(--accent-secondary);
}

/* Inner orbit ring — spins counter-clockwise */
.hero-orbit-inner {
  position: absolute;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  border: 1px dashed rgba(var(--accent-secondary-rgb), 0.2);
  z-index: 2;
  animation: spin-ccw 20s linear infinite;
}

/* Travelling dot on inner ring */
.hero-orbit-inner::before {
  content: '';
  position: absolute;
  top: -4px;
  left: 50%;
  transform: translateX(-50%);
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent-secondary);
  box-shadow: 0 0 8px var(--accent-secondary);
}

@keyframes spin-cw  { to { transform: rotate(360deg);  } }
@keyframes spin-ccw { to { transform: rotate(-360deg); } }

/* Photo frame */
.hero-image-frame {
  position: relative;
  z-index: 3;
  width: 290px;
  height: 290px;
  border-radius: 50%;
  overflow: hidden;
  border: 2.5px solid rgba(var(--accent-rgb), 0.55);
  box-shadow:
    0 0 0 4px rgba(var(--accent-rgb), 0.08),
    0 0 35px rgba(var(--accent-rgb), 0.25),
    0 25px 60px var(--shadow-color);
  transition: var(--transition-smooth);
}

.hero-image-frame:hover {
  border-color: var(--accent);
  box-shadow:
    0 0 0 6px rgba(var(--accent-rgb), 0.12),
    0 0 50px rgba(var(--accent-rgb), 0.4),
    0 30px 70px var(--shadow-color);
  transform: scale(1.04);
}

.hero-portrait {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
  display: block;
  transition: var(--transition-smooth);
  transform: scale(1.05);
}

.hero-image-frame:hover .hero-portrait {
  transform: scale(1.1);
}

/* Subtle gradient overlay on photo */
.hero-image-overlay {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: linear-gradient(
    180deg,
    transparent 45%,
    rgba(6, 5, 11, 0.18) 100%
  );
  pointer-events: none;
  z-index: 4;
}

body.light-theme .hero-image-overlay {
  background: linear-gradient(
    180deg,
    transparent 45%,
    rgba(249, 248, 252, 0.1) 100%
  );
}

/* --- Floating Badge Chips --- */
.hero-floating-badge,
.hero-floating-badge-2,
.hero-floating-badge-3 {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 0.45rem 1rem;
  border-radius: 30px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.3px;
  white-space: nowrap;
  z-index: 6;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
  transition: var(--transition-smooth);
}

/* Badge 1 — top right — Developer */
.hero-floating-badge {
  top: 10px;
  right: -40px;
  background: rgba(14, 12, 22, 0.82);
  border: 1px solid rgba(var(--accent-rgb), 0.35);
  color: var(--accent);
  animation: float-a 3.5s ease-in-out infinite alternate;
}

body.light-theme .hero-floating-badge {
  background: rgba(255, 255, 255, 0.88);
  border-color: rgba(var(--accent-rgb), 0.2);
}

/* Badge 2 — middle right — Tech Enthusiast */
.hero-floating-badge-2 {
  bottom: 70px;
  right: -55px;
  background: rgba(14, 12, 22, 0.82);
  border: 1px solid rgba(var(--accent-secondary-rgb), 0.35);
  color: var(--accent-secondary);
  animation: float-b 4s ease-in-out infinite alternate;
}

body.light-theme .hero-floating-badge-2 {
  background: rgba(255, 255, 255, 0.88);
  border-color: rgba(var(--accent-secondary-rgb), 0.2);
}

/* Badge 3 — bottom left — CS @ AIUB */
.hero-floating-badge-3 {
  bottom: 10px;
  left: -45px;
  background: rgba(14, 12, 22, 0.82);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--text-muted);
  animation: float-c 4.5s ease-in-out infinite alternate;
}

body.light-theme .hero-floating-badge-3 {
  background: rgba(255, 255, 255, 0.88);
  border-color: rgba(0, 0, 0, 0.08);
}

.hero-floating-badge i,
.hero-floating-badge-2 i,
.hero-floating-badge-3 i {
  font-size: 0.9rem;
}

@keyframes float-a {
  0%   { transform: translateY(0px)  translateX(0px);  }
  100% { transform: translateY(-8px) translateX(3px);  }
}
@keyframes float-b {
  0%   { transform: translateY(0px) translateX(0px);   }
  100% { transform: translateY(6px) translateX(-4px);  }
}
@keyframes float-c {
  0%   { transform: translateY(0px)  translateX(0px);  }
  100% { transform: translateY(-6px) translateX(4px);  }
}

.hero-floating-badge:hover,
.hero-floating-badge-2:hover,
.hero-floating-badge-3:hover {
  transform: scale(1.06);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.35);
}

/* --- Project GitHub and Tag Styling Updates --- */
.project-git-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(120, 120, 150, 0.08);
  border: 1px solid var(--surface-border);
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  transition: var(--transition-fast);
}

.project-git-link:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  box-shadow: var(--glow-shadow);
  transform: translateY(-2px) scale(1.08);
}

.proj-tech-tag.ts-badge {
  color: #3178c6;
  border-color: rgba(49, 120, 198, 0.25);
  background: rgba(49, 120, 198, 0.06);
}

.proj-tech-tag.ts-badge:hover {
  border-color: #3178c6;
  background: rgba(49, 120, 198, 0.12);
}

body.light-theme .proj-tech-tag.ts-badge {
  color: #0056b3;
  border-color: rgba(0, 86, 179, 0.2);
  background: rgba(0, 86, 179, 0.05);
}

@media (min-width: 993px) {
  .project-card.featured-project {
    grid-column: span 2;
  }
}

/* --- Project Clone Box --- */
.project-clone-box {
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(120, 120, 150, 0.06);
  border: 1px solid var(--surface-border);
  border-radius: 10px;
  padding: 0.5rem 0.8rem;
  margin: 0.9rem 0 1.2rem 0;
  overflow: hidden;
}

.clone-label {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 1px;
  white-space: nowrap;
  flex-shrink: 0;
}

.clone-code {
  font-family: 'Courier New', monospace;
  font-size: 0.72rem;
  color: var(--text-muted);
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.clone-copy-btn {
  background: transparent;
  border: 1px solid var(--surface-border);
  border-radius: 6px;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.25rem 0.5rem;
  font-size: 0.85rem;
  flex-shrink: 0;
  transition: var(--transition-fast);
  display: flex;
  align-items: center;
}

.clone-copy-btn:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.clone-copy-btn.copied {
  background: #22c55e;
  border-color: #22c55e;
  color: #fff;
}

/* Real World badge */
.badge-live {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.68rem;
  font-weight: 700;
  padding: 0.25rem 0.6rem;
  border-radius: 6px;
  border: 1px solid rgba(34, 197, 94, 0.3);
  color: #22c55e;
  background: rgba(34, 197, 94, 0.08);
  animation: pulse-green 2s infinite;
}

/* --- Accessibility: respect users who prefer reduced motion --- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  /* Reveal-on-scroll elements must stay visible without their transition */
  .reveal-up {
    opacity: 1;
    transform: none;
  }
}

/* --- Project Card: Screenshot Thumbnail --- */
.project-thumb {
  position: relative;
  margin: -2.5rem -2.5rem 1.5rem -2.5rem;
  height: 250px;
  padding-top: 34px;
  overflow: hidden;
  border-radius: 24px 24px 0 0;
  background: #0d0b14;
  border-bottom: 1px solid var(--surface-border);
}

.featured-project .project-thumb {
  height: 360px;
}

/* Browser-style window bar across the top of the preview */
.project-thumb::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 34px;
  background: rgba(20, 18, 28, 0.96);
  border-bottom: 1px solid var(--surface-border);
  z-index: 2;
}

/* Three "traffic-light" dots on the window bar */
.project-thumb::before {
  content: '';
  position: absolute;
  top: 12px;
  left: 16px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #ff5f57;
  box-shadow: 17px 0 0 #febc2e, 34px 0 0 #28c840;
  z-index: 3;
}

.project-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
  display: block;
  transition: var(--transition-smooth);
}

.project-card:hover .project-thumb img {
  transform: scale(1.03);
}

body.light-theme .project-thumb {
  background: #eef0f4;
}

body.light-theme .project-thumb::after {
  background: rgba(255, 255, 255, 0.96);
}

/* ============================================================
   BEYOND THE CLASSROOM — Poster presentations
   ============================================================ */
.posters-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

.poster-card {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  padding: 0;
}

.poster-thumb {
  position: relative;
  display: block;
  height: 340px;
  overflow: hidden;
  background: #0d0b14;
  border-bottom: 1px solid var(--surface-border);
}

.poster-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
  display: block;
  transition: var(--transition-smooth);
}

.poster-card:hover .poster-thumb img {
  transform: scale(1.04);
}

.poster-open {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 700;
  color: #fff;
  background: rgba(6, 5, 11, 0.5);
  backdrop-filter: blur(2px);
  opacity: 0;
  transition: var(--transition-fast);
}

.poster-card:hover .poster-open {
  opacity: 1;
}

.poster-body {
  padding: 1.6rem 1.8rem 1.8rem;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  flex: 1;
}

.poster-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  align-self: flex-start;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 0.3rem 0.7rem;
  border-radius: 7px;
}

.poster-tag.tag-cs {
  color: #6aa6ff;
  background: rgba(106, 166, 255, 0.1);
  border: 1px solid rgba(106, 166, 255, 0.28);
}

.poster-tag.tag-physics {
  color: #ffb86b;
  background: rgba(255, 184, 107, 0.1);
  border: 1px solid rgba(255, 184, 107, 0.28);
}

.poster-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text);
  margin-top: 0.3rem;
}

.poster-sub {
  color: var(--accent);
  font-weight: 600;
  font-size: 0.95rem;
}

.poster-desc {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.65;
}

.poster-foot {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-top: auto;
  padding-top: 1.1rem;
}

.poster-meta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.76rem;
  color: var(--text-dim);
}

.poster-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  font-weight: 700;
  padding: 0.55rem 1.1rem;
  border-radius: 10px;
  text-decoration: none;
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  box-shadow: var(--glow-shadow);
  transition: var(--transition-fast);
  white-space: nowrap;
}

.poster-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(var(--accent-rgb), 0.35);
}

/* ============================================================
   BLOG CARDS — redesigned grid with graph headers
   ============================================================ */
.blog-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.8rem;
}

.blog-card {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  padding: 0;
  text-decoration: none;
}

.blog-visual {
  position: relative;
  height: 150px;
  overflow: hidden;
  border-bottom: 1px solid var(--surface-border);
}

.blog-visual svg {
  width: 100%;
  height: 100%;
  display: block;
}

.blog-visual .blog-num {
  position: absolute;
  top: 10px;
  right: 16px;
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 800;
  opacity: 0.75;
  margin: 0;
}

.bv-red { background: linear-gradient(135deg, rgba(255, 70, 80, 0.18), rgba(255, 70, 80, 0.03)); }
.bv-red svg rect { fill: #ff5b6a; opacity: 0.85; }
.bv-red .blog-num { color: #ff7783; }

.bv-gold { background: linear-gradient(135deg, rgba(255, 180, 80, 0.18), rgba(255, 180, 80, 0.03)); }
.bv-gold .bv-line { fill: none; stroke: #ffb44d; stroke-width: 3; stroke-linecap: round; stroke-linejoin: round; }
.bv-gold .bv-area { fill: rgba(255, 180, 77, 0.18); stroke: none; }
.bv-gold .blog-num { color: #ffc36b; }

.bv-blue { background: linear-gradient(135deg, rgba(80, 140, 255, 0.18), rgba(80, 140, 255, 0.03)); }
.bv-blue .bv-curve { fill: none; stroke: #5b8cff; stroke-width: 3; stroke-linecap: round; }
.bv-blue .bv-curve-2 { stroke: #9db8ff; opacity: 0.7; }
.bv-blue .bv-axis { stroke: rgba(255, 255, 255, 0.22); stroke-width: 1.5; }
.bv-blue .blog-num { color: #82a6ff; }

.blog-content {
  padding: 1.5rem 1.6rem 1.6rem;
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  flex: 1;
}

.blog-readmore {
  margin-top: auto;
  padding-top: 0.4rem;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  align-self: flex-start;
  color: var(--accent);
  font-weight: 700;
  font-size: 0.85rem;
  text-decoration: none;
}

.blog-readmore i {
  transition: var(--transition-fast);
}

.blog-readmore:hover i {
  transform: translateX(4px);
}

/* ============================================================
   BLOG ARTICLE PAGES (blog/*.html)
   ============================================================ */
.article-topbar {
  max-width: 860px;
  margin: 0 auto;
  padding: 2rem 1.5rem 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.back-home {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
  transition: var(--transition-fast);
}

.back-home:hover { color: var(--accent); gap: 12px; }

.article-topbar .nav-logo-text {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--text);
}

.article-wrap {
  max-width: 760px;
  margin: 0 auto;
  padding: 2rem 1.5rem 5rem;
}

.article-cat {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.74rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  padding: 0.3rem 0.8rem;
  border-radius: 7px;
}

.article-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.1rem);
  font-weight: 900;
  line-height: 1.1;
  margin: 1.2rem 0 1rem;
  color: var(--text);
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.2rem;
  color: var(--text-dim);
  font-size: 0.88rem;
  padding-bottom: 1.8rem;
  border-bottom: 1px solid var(--surface-border);
}

.article-meta span { display: inline-flex; align-items: center; gap: 6px; }

.article-cover {
  position: relative;
  height: 240px;
  border-radius: 18px;
  overflow: hidden;
  margin: 2rem 0;
  border: 1px solid var(--surface-border);
}

.article-cover svg { width: 100%; height: 100%; display: block; }

.article-body { font-size: 1.06rem; line-height: 1.8; color: var(--text-muted); }

.article-body > p { margin: 0 0 1.4rem; }

.article-body .lead {
  font-size: 1.22rem;
  line-height: 1.7;
  color: var(--text);
  font-weight: 500;
}

.article-body h2 {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text);
  margin: 2.6rem 0 1rem;
}

.article-body h2 .h2-accent { color: var(--accent); }

.article-body strong { color: var(--text); }

.article-body a { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; }

.article-body ul { margin: 0 0 1.4rem; padding-left: 1.3rem; }
.article-body li { margin-bottom: 0.6rem; }

.article-body blockquote {
  margin: 2rem 0;
  padding: 1.2rem 1.6rem;
  border-left: 4px solid var(--accent);
  background: rgba(var(--accent-rgb), 0.06);
  border-radius: 0 12px 12px 0;
  font-size: 1.25rem;
  line-height: 1.6;
  font-weight: 600;
  color: var(--text);
  font-style: italic;
}

.article-fig {
  margin: 2.4rem 0;
  padding: 1.6rem;
  border-radius: 16px;
  border: 1px solid var(--surface-border);
  background: var(--card-hover-bg, rgba(255, 255, 255, 0.02));
}

.article-fig svg { width: 100%; height: auto; display: block; }

.article-fig figcaption {
  margin-top: 1rem;
  font-size: 0.84rem;
  color: var(--text-dim);
  text-align: center;
}

.fig-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  color: var(--text);
  margin-bottom: 1.2rem;
}

.article-foot {
  margin-top: 3.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--surface-border);
  text-align: center;
}

.article-foot p { color: var(--text-dim); margin-bottom: 1.2rem; }

/* Chart helpers shared by article SVGs */
.chart-grid { stroke: rgba(255, 255, 255, 0.08); stroke-width: 1; }
.chart-axis { stroke: rgba(255, 255, 255, 0.25); stroke-width: 1.5; }
.chart-label { fill: var(--text-dim); font-size: 12px; font-family: var(--font-body, sans-serif); }
.chart-val { fill: var(--text); font-size: 12px; font-weight: 700; font-family: var(--font-body, sans-serif); }

body.light-theme .chart-grid { stroke: rgba(0, 0, 0, 0.08); }
body.light-theme .chart-axis { stroke: rgba(0, 0, 0, 0.25); }

/* ============================================================
   RESPONSIVE — posters & blog
   ============================================================ */
@media (max-width: 992px) {
  .posters-grid { grid-template-columns: 1fr; }
  .blog-list { grid-template-columns: 1fr; }
}

@media (min-width: 993px) and (max-width: 1200px) {
  .blog-list { grid-template-columns: repeat(3, 1fr); }
}

/* ============================================================
   FEATURED RESEARCH PAPER CARD
   ============================================================ */
.research-card {
  display: grid;
  grid-template-columns: 300px 1fr;
  overflow: hidden;
  padding: 0;
  margin-bottom: 2rem;
}

.research-thumb {
  position: relative;
  display: block;
  overflow: hidden;
  background: #0d0b14;
  border-right: 1px solid var(--surface-border);
}

.research-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
  display: block;
  transition: var(--transition-smooth);
}

.research-card:hover .research-thumb img { transform: scale(1.04); }

.research-body {
  padding: 1.8rem 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.poster-tag.tag-research {
  color: #c694fb;
  background: rgba(168, 120, 250, 0.12);
  border: 1px solid rgba(168, 120, 250, 0.3);
}

.research-stats {
  display: flex;
  gap: 1.8rem;
  margin: 1rem 0 0.5rem;
  flex-wrap: wrap;
}

.research-stats > div { display: flex; flex-direction: column; }

.rs-num {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
}

.rs-label {
  font-size: 0.7rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-top: 4px;
}

.research-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0.7rem 0;
}

@media (max-width: 760px) {
  .research-card { grid-template-columns: 1fr; }
  .research-thumb {
    height: 300px;
    border-right: none;
    border-bottom: 1px solid var(--surface-border);
  }
}

.project-thumb-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  color: var(--text-dim);
}

.project-thumb-placeholder i {
  font-size: 2rem;
  opacity: 0.5;
}

.project-thumb-placeholder span {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  font-weight: 600;
}

/* --- Project Links (Live Demo / Code buttons) --- */
.project-links {
  display: flex;
  gap: 0.6rem;
  margin: 0 0 1.4rem 0;
  flex-wrap: wrap;
  transform: translateZ(30px);
}

.project-link-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.5rem 1rem;
  border-radius: 10px;
  text-decoration: none;
  border: 1px solid transparent;
  transition: var(--transition-fast);
}

.project-link-btn.live {
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  color: #fff;
  box-shadow: var(--glow-shadow);
}

.project-link-btn.live:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(var(--accent-rgb), 0.35);
}

.project-link-btn.ghost {
  background: rgba(120, 120, 150, 0.06);
  border-color: var(--surface-border);
  color: var(--text-muted);
}

.project-link-btn.ghost:hover {
  color: var(--text);
  border-color: var(--card-border-hover);
  background: var(--card-hover-bg);
}

/* Disabled state — no live URL yet */
.project-link-btn.disabled {
  opacity: 0.45;
  pointer-events: none;
  filter: grayscale(0.4);
}

/* --- Skip to Content (accessibility) --- */
.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  z-index: 2000;
  background: var(--accent);
  color: #fff;
  padding: 0.7rem 1.2rem;
  border-radius: 0 0 10px 0;
  font-weight: 600;
  text-decoration: none;
}

.skip-link:focus {
  left: 0;
}

/* --- Scroll Progress Bar --- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0;
  background: linear-gradient(to right, var(--accent), var(--accent-secondary));
  z-index: 1500;
  transition: width 0.1s linear;
}

/* --- Back to Top Button --- */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 48px;
  height: 48px;
  border-radius: 14px;
  border: 1px solid var(--surface-border);
  background: var(--nav-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  color: var(--text);
  font-size: 1.2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: var(--transition-smooth);
  z-index: 900;
  box-shadow: 0 10px 30px var(--shadow-color);
}

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

.back-to-top:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  box-shadow: var(--glow-shadow);
  transform: translateY(-3px);
}

/* --- Keyboard Focus Visibility (accessibility) --- */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

/* --- Skills proficiency level labels --- */
.skills-level {
  font-size: 0.62rem;
  font-weight: 800;
  letter-spacing: 1px;
  padding: 0.15rem 0.5rem;
  border-radius: 5px;
  margin-left: auto;
  text-transform: uppercase;
}

.skills-level.strong {
  color: var(--tag-text-green);
  background: var(--tag-bg-green);
  border: 1px solid var(--tag-border-green);
}

.skills-level.familiar {
  color: var(--tag-text-gold);
  background: var(--tag-bg-gold);
  border: 1px solid var(--tag-border-gold);
}

.skills-group-title.with-level::after {
  display: none;
}