/* ============================================================
   DESIGN SYSTEM — Harsit Upadhya Personal Academic Portfolio
   Tech-forward theme: dark mode first, electric accents, circuit motifs
   ============================================================ */

/* --- Google Fonts Import --- */
@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@300;400;500;600;700&family=IBM+Plex+Mono:ital,wght@0,400;0,500;0,600;1,400&family=Outfit:wght@300;400;500;600;700&display=swap');

/* --- CSS Custom Properties --- */
:root {
  /* Colors — Dark Mode (default/primary) */
  --bg-primary: #02040D;
  --bg-secondary: #080D1A;
  --bg-tertiary: #101728;
  --bg-card: #0C1220;
  --text-primary: #E8F0FE;
  --text-secondary: #8B9EBF;
  --text-tertiary: #4A5568;
  --accent: #00E5CC;
  --accent-secondary: #7B61FF;
  --accent-tertiary: #FF6B35;
  --accent-subtle: rgba(0, 229, 204, 0.08);
  --accent-subtle-hover: rgba(0, 229, 204, 0.14);
  --border: rgba(255, 255, 255, 0.06);
  --border-accent: rgba(0, 229, 204, 0.3);
  --glow: rgba(104, 186, 255, 0.12);
  --glow-strong: rgba(255, 183, 92, 0.24);

  /* Typography */
  --font-display: 'Outfit', system-ui, sans-serif;
  --font-body: 'Space Grotesk', system-ui, sans-serif;
  --font-mono: 'IBM Plex Mono', 'Fira Code', monospace;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2.5rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;

  /* Layout */
  --content-width: 760px;
  --wide-width: 1200px;
  --nav-height: 64px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

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

body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.65;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--transition-base), color var(--transition-base);
  /* The animated solar-system canvas handles the moving background.
     Keep the static page color deep and low-contrast beneath it. */
  background-image:
    radial-gradient(ellipse at 78% 32%, rgba(159, 89, 57, 0.18) 0%, transparent 44%),
    radial-gradient(ellipse at 16% 58%, rgba(61, 42, 126, 0.22) 0%, transparent 52%),
    radial-gradient(ellipse at 58% 98%, rgba(22, 76, 104, 0.14) 0%, transparent 46%),
    linear-gradient(180deg, #02040D 0%, #060817 42%, #02040D 100%);
  background-size: 75% 60%, 65% 65%, 58% 48%, auto;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.2;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2rem, 5vw, 3.25rem); font-weight: 700; }
h2 { font-size: clamp(1.5rem, 3vw, 2rem); margin-bottom: var(--space-lg); }
h3 { font-size: clamp(1.125rem, 2vw, 1.5rem); }
h4 { font-size: 1.125rem; }

p {
  margin-bottom: var(--space-md);
  max-width: 68ch;
  color: var(--text-secondary);
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition-fast), opacity var(--transition-fast);
}

a:hover {
  color: var(--accent);
  opacity: 0.8;
  text-decoration: none;
}

a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 3px;
}

strong { font-weight: 600; color: var(--text-primary); }
em { font-style: italic; }

[hidden] {
  display: none !important;
}

input,
textarea,
button {
  font: inherit;
}

/* --- Layout --- */
.container {
  width: 100%;
  max-width: var(--wide-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.content {
  max-width: var(--content-width);
  margin: 0 auto;
}

section {
  padding: var(--space-3xl) 0;
}

section,
.hero,
.footer {
  position: relative;
  z-index: 1;
}

section + section {
  border-top: 1px solid var(--border);
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(2, 4, 13, 0.84);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
  transition: background-color var(--transition-base), border-color var(--transition-base);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--wide-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.nav-logo {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.nav-logo:hover {
  text-decoration: none;
  color: var(--accent);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: clamp(var(--space-md), 2.4vw, var(--space-xl));
  list-style: none;
}

.nav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
  padding: var(--space-xs) 0;
  position: relative;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--accent);
  text-decoration: none;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width var(--transition-fast);
  border-radius: 2px;
  box-shadow: 0 0 8px var(--glow);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.mode-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 58px;
  min-height: 30px;
  padding: 5px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-secondary);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  cursor: pointer;
  transition: color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast), box-shadow var(--transition-fast);
}

.mode-toggle::before {
  content: '';
  width: 6px;
  height: 6px;
  margin-right: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 10px var(--glow-strong);
}

.mode-toggle:hover,
.mode-toggle:focus-visible {
  background: var(--accent-subtle);
  border-color: var(--border-accent);
  color: var(--text-primary);
  box-shadow: 0 0 16px var(--glow);
  outline: none;
}

/* --- Hero Section --- */
.hero {
  min-height: 90vh;
  display: flex;
  align-items: center;
  padding-top: calc(var(--nav-height) + var(--space-2xl));
  padding-bottom: var(--space-3xl);
  position: relative;
  overflow: hidden;
}

/* Circuit/network SVG background */
.hero::before {
  content: none;
  position: absolute;
  top: 0;
  right: -5%;
  width: 65%;
  height: 100%;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 600 500' opacity='0.18'%3E%3Ccircle cx='420' cy='80' r='5' fill='%2300E5CC'/%3E%3Ccircle cx='180' cy='160' r='4' fill='%2300E5CC'/%3E%3Ccircle cx='520' cy='240' r='6' fill='%2300E5CC'/%3E%3Ccircle cx='80' cy='300' r='4' fill='%2300E5CC'/%3E%3Ccircle cx='350' cy='380' r='5' fill='%2300E5CC'/%3E%3Ccircle cx='560' cy='420' r='4' fill='%2300E5CC'/%3E%3Cline x1='420' y1='80' x2='520' y2='240' stroke='%2300E5CC' stroke-width='1' stroke-opacity='0.5'/%3E%3Cline x1='520' y1='240' x2='350' y2='380' stroke='%2300E5CC' stroke-width='1' stroke-opacity='0.4'/%3E%3Cline x1='180' y1='160' x2='80' y2='300' stroke='%2300E5CC' stroke-width='1' stroke-opacity='0.5'/%3E%3Cline x1='80' y1='300' x2='350' y2='380' stroke='%2300E5CC' stroke-width='1' stroke-opacity='0.3'/%3E%3Cline x1='420' y1='80' x2='180' y2='160' stroke='%2300E5CC' stroke-width='1' stroke-opacity='0.4'/%3E%3Cline x1='520' y1='240' x2='560' y2='420' stroke='%2300E5CC' stroke-width='1' stroke-opacity='0.3'/%3E%3Cline x1='350' y1='380' x2='80' y2='300' stroke='%2300E5CC' stroke-width='0.5' stroke-opacity='0.2'/%3E%3Cline x1='180' y1='160' x2='350' y2='380' stroke='%237B61FF' stroke-width='0.5' stroke-opacity='0.3'/%3E%3Ccircle cx='280' cy='200' r='3' fill='%237B61FF'/%3E%3Ccircle cx='460' cy='340' r='3' fill='%237B61FF'/%3E%3Crect x='200' y='150' width='80' height='50' rx='4' fill='none' stroke='%2300E5CC' stroke-width='1' stroke-opacity='0.3'/%3E%3Crect x='390' y='320' width='80' height='50' rx='4' fill='none' stroke='%237B61FF' stroke-width='1' stroke-opacity='0.3'/%3E%3Ctext x='210' y='172' font-family='monospace' font-size='7' fill='%2300E5CC' opacity='0.5'>ML</text>%3E%3Ctext x='400' y='342' font-family='monospace' font-size='7' fill='%237B61FF' opacity='0.5'>GNN</text>%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right center;
  background-size: 100% auto;
  pointer-events: none;
  z-index: 0;
}

/* Ambient glow orbs */
.hero::after {
  content: '';
  position: absolute;
  top: 20%;
  right: 15%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(255, 178, 94, 0.055) 0%, rgba(92, 69, 160, 0.025) 42%, transparent 72%);
  pointer-events: none;
  z-index: 0;
}

.hero-content {
  max-width: 58ch;
  position: relative;
  z-index: 1;
}

.hero-text h1 {
  margin-bottom: var(--space-sm);
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-title {
  font-family: var(--font-mono);
  font-size: clamp(0.875rem, 1.5vw, 1.125rem);
  font-weight: 400;
  color: var(--accent);
  margin-bottom: var(--space-sm);
  letter-spacing: -0.01em;
}

.hero-open-to {
  display: inline-flex;
  max-width: 58ch;
  margin-bottom: var(--space-lg);
  padding: 6px 11px;
  border: 1px solid var(--border-accent);
  border-radius: 8px;
  background: linear-gradient(135deg, rgba(0, 229, 204, 0.1), rgba(123, 97, 255, 0.1));
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.5;
  box-shadow: 0 0 16px var(--glow);
}

.hero-bio {
  font-size: 1.0625rem;
  color: var(--text-secondary);
  max-width: 58ch;
  margin-bottom: var(--space-xl);
  line-height: 1.7;
}

.hero-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  list-style: none;
}

.hero-links a {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 10px 18px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
  transition: all var(--transition-fast);
  backdrop-filter: blur(8px);
}

.hero-links a:hover {
  background: var(--accent-subtle);
  border-color: var(--border-accent);
  color: var(--accent);
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: 0 4px 20px var(--glow), 0 0 0 1px var(--border-accent);
}

.hero-links svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
}

.hero-profile {
  display: block;
  width: 124px;
  height: 124px;
  margin: 0.875rem 0 1.25rem;
  border-radius: 16px;
  object-fit: cover;
  border: 2px solid var(--border-accent);
  box-shadow: 0 0 30px var(--glow), 0 8px 32px rgba(0,0,0,0.3);
  position: relative;
}

.hero-profile.profile-play-trigger {
  cursor: grab;
  user-select: none;
  -webkit-user-drag: none;
  touch-action: none;
}

.hero-profile.profile-play-trigger:active {
  cursor: grabbing;
}

.hero-profile.photo-cycled {
  animation: profilePhotoPop 280ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

.profile-football {
  position: fixed;
  top: 0;
  left: 0;
  width: 118px;
  height: 118px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--border-accent);
  box-shadow:
    0 0 28px var(--glow-strong),
    0 14px 36px rgba(0, 0, 0, 0.38);
  z-index: 120;
  cursor: grab;
  user-select: none;
  -webkit-user-drag: none;
  touch-action: none;
  will-change: transform;
}

.profile-football:active {
  cursor: grabbing;
}

.profile-football::selection {
  background: transparent;
}

@keyframes profilePhotoPop {
  0% { transform: scale(0.96); filter: saturate(0.85); }
  60% { transform: scale(1.04); filter: saturate(1.15); }
  100% { transform: scale(1); filter: saturate(1); }
}

.hero-profile::before {
  content: '';
  position: absolute;
  inset: -3px;
  border-radius: 18px;
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  z-index: -1;
  opacity: 0.4;
  animation: profileGlow 3s ease-in-out infinite;
}

@keyframes profileGlow {
  0%, 100% {
    opacity: 0.4;
    inset: -3px;
    filter: blur(2px);
  }
  50% {
    opacity: 0.7;
    inset: -5px;
    filter: blur(4px);
  }
}

/* Floating animation applied after typewriter reveals */
.hero-profile.float-animate {
  animation: profileFloat 5s ease-in-out infinite;
}

@keyframes profileFloat {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-8px); }
}

/* Fade in for profile when typewriter is done */
.hero-profile {
  opacity: 0;
  transition: opacity 0.6s ease 0.3s;
}

.hero-profile.visible {
  opacity: 1;
}

.hero-profile.float-animate {
  opacity: 1;
  animation: profileFloat 5s ease-in-out infinite;
}

/* --- Tags / Badges --- */
.tag {
  display: inline-block;
  padding: 3px 10px;
  background: var(--accent-subtle);
  color: var(--accent);
  border: 1px solid var(--border-accent);
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  white-space: nowrap;
  letter-spacing: 0.02em;
}

.tag-purple {
  background: rgba(123, 97, 255, 0.08);
  color: var(--accent-secondary);
  border-color: rgba(123, 97, 255, 0.3);
}

.tag-orange {
  background: rgba(255, 107, 53, 0.08);
  color: var(--accent-tertiary);
  border-color: rgba(255, 107, 53, 0.3);
}

.tag-outline {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
}

/* --- Section Headers --- */
.section-header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}

.section-number {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  min-width: 2rem;
  padding: 3px 8px;
  background: var(--accent-subtle);
  border: 1px solid var(--border-accent);
  border-radius: 4px;
}

/* --- Cards --- */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: var(--space-xl);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent-secondary));
  opacity: 0;
  transition: opacity var(--transition-base);
}

.card:hover {
  border-color: var(--border-accent);
  transform: translateY(-4px);
  box-shadow: 0 8px 32px rgba(0, 229, 204, 0.1), 0 0 0 1px rgba(0, 229, 204, 0.08);
}

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

[data-theme="dark"] .card:hover {
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(0, 229, 204, 0.15);
}

/* Project Grid */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: var(--space-lg);
}

.project-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  will-change: transform;
}

.project-card > :not(.tilt-glare) {
  position: relative;
  z-index: 1;
}

.project-card .tilt-glare {
  z-index: 0;
}

.project-card p {
  color: rgba(232, 240, 254, 0.82);
}

.project-card h3 {
  margin-bottom: 0;
  font-family: var(--font-display);
  font-size: 1.1875rem;
}

.project-pitch {
  font-size: 0.9375rem;
  color: rgba(232, 240, 254, 0.84);
  flex-grow: 1;
  line-height: 1.6;
}

.project-card .project-sidebar p,
.project-card p[style*="text-tertiary"] {
  color: rgba(232, 240, 254, 0.72) !important;
}

.project-card:hover p,
.project-card.tilt-active p,
.project-card:hover .project-pitch,
.project-card.tilt-active .project-pitch,
.project-card:hover .project-sidebar p,
.project-card.tilt-active .project-sidebar p,
.project-card:hover p[style*="text-tertiary"],
.project-card.tilt-active p[style*="text-tertiary"] {
  color: rgba(248, 251, 255, 0.96) !important;
  text-shadow: 0 1px 12px rgba(10, 14, 23, 0.55);
}

.project-metrics {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
}

.metric-chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  background: linear-gradient(135deg, rgba(0, 229, 204, 0.12), rgba(123, 97, 255, 0.12));
  border: 1px solid var(--border-accent);
  border-radius: 20px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent);
  font-weight: 500;
}

.metric-chip svg {
  width: 10px;
  height: 10px;
  fill: currentColor;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: auto;
  padding-top: var(--space-sm);
}

.project-links {
  display: flex;
  gap: var(--space-md);
  font-size: 0.875rem;
  margin-top: var(--space-xs);
}

.project-links a {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 5px 12px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.8125rem;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.project-links a:hover {
  background: var(--accent-subtle);
  border-color: var(--border-accent);
  color: var(--accent);
}

/* --- Featured/Highlight Card --- */
.project-card.featured {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: start;
}

.project-card.featured .project-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.project-card.featured h3 {
  font-size: 1.375rem;
}

.project-card.featured .project-pitch {
  font-size: 1rem;
}

.project-card.featured .project-sidebar {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

/* --- CodeNexus Project Visual --- */
.code-nexus-card {
  background:
    linear-gradient(135deg, rgba(0, 229, 204, 0.08), rgba(123, 97, 255, 0.08) 48%, rgba(255, 107, 53, 0.06)),
    var(--bg-card);
}

.code-nexus-visual {
  min-height: 220px;
  position: relative;
  overflow: hidden;
  border: 1px solid var(--border-accent);
  border-radius: 10px;
  background:
    radial-gradient(circle at 22% 36%, rgba(0, 229, 204, 0.16), transparent 30%),
    radial-gradient(circle at 78% 68%, rgba(123, 97, 255, 0.16), transparent 34%),
    linear-gradient(rgba(0, 229, 204, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 229, 204, 0.05) 1px, transparent 1px),
    rgba(10, 14, 23, 0.58);
  background-size: auto, auto, 28px 28px, 28px 28px, auto;
  box-shadow: inset 0 0 30px rgba(0, 229, 204, 0.08);
}

.code-nexus-visual::after {
  content: '';
  position: absolute;
  inset: -40% -20%;
  background: linear-gradient(110deg, transparent 35%, rgba(255, 255, 255, 0.12) 50%, transparent 65%);
  animation: graphScan 5s linear infinite;
}

.graph-node {
  position: absolute;
  z-index: 2;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 56px;
  min-height: 34px;
  padding: 5px 10px;
  border: 1px solid var(--border-accent);
  border-radius: 8px;
  background: rgba(15, 22, 35, 0.9);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  box-shadow: 0 0 18px rgba(0, 229, 204, 0.16);
  animation: graphNodePulse 3.6s ease-in-out infinite;
}

.node-ingest { left: 7%; top: 43%; }
.node-ast { left: 30%; top: 20%; color: var(--accent-secondary); border-color: rgba(123, 97, 255, 0.4); animation-delay: 0.4s; }
.node-graph { left: 51%; top: 43%; color: var(--accent-tertiary); border-color: rgba(255, 107, 53, 0.4); animation-delay: 0.8s; }
.node-agents { right: 7%; top: 20%; color: var(--accent-secondary); border-color: rgba(123, 97, 255, 0.4); animation-delay: 1.2s; }
.node-reports { right: 7%; bottom: 18%; animation-delay: 1.6s; }

.graph-edge {
  position: absolute;
  z-index: 1;
  height: 2px;
  border-radius: 999px;
  transform-origin: left center;
  background: linear-gradient(90deg, transparent, var(--accent), var(--accent-secondary), transparent);
  background-size: 200% 100%;
  opacity: 0.78;
  animation: graphEdgeFlow 2.4s linear infinite;
}

.edge-ingest-ast { left: 21%; top: 45%; width: 17%; transform: rotate(-29deg); }
.edge-ast-graph { left: 42%; top: 35%; width: 18%; transform: rotate(30deg); animation-delay: 0.3s; }
.edge-graph-agents { left: 64%; top: 43%; width: 18%; transform: rotate(-29deg); animation-delay: 0.6s; }
.edge-graph-reports { left: 64%; top: 57%; width: 18%; transform: rotate(29deg); animation-delay: 0.9s; }
.edge-ast-reports { left: 39%; top: 32%; width: 43%; transform: rotate(33deg); opacity: 0.35; animation-delay: 1.2s; }

@keyframes graphScan {
  from { transform: translateX(-45%); }
  to { transform: translateX(45%); }
}

@keyframes graphNodePulse {
  0%, 100% { transform: translateY(0); box-shadow: 0 0 18px rgba(0, 229, 204, 0.14); }
  50% { transform: translateY(-3px); box-shadow: 0 0 26px rgba(0, 229, 204, 0.28); }
}

@keyframes graphEdgeFlow {
  from { background-position: 200% 0; }
  to { background-position: -200% 0; }
}

/* --- Publications --- */
.publication-year {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--accent);
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--border);
  letter-spacing: 0.05em;
}

.publication-entry {
  margin-bottom: var(--space-xl);
}

.publication-entry .authors {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-xs);
}

.publication-entry .authors strong {
  color: var(--accent);
}

.publication-entry .title {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

.publication-entry .venue {
  font-size: 0.9375rem;
  color: var(--accent-secondary);
  font-family: var(--font-mono);
  margin-bottom: var(--space-sm);
}

.publication-links {
  display: flex;
  gap: var(--space-md);
  font-size: 0.875rem;
}

/* --- Blog --- */
.blog-index {
  padding-top: calc(var(--nav-height) + var(--space-2xl));
}

.blog-intro {
  color: var(--text-secondary);
  max-width: 58ch;
  margin-bottom: var(--space-2xl);
}

.blog-list {
  display: grid;
  gap: var(--space-lg);
}

.blog-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.blog-card h2 {
  margin-bottom: 0;
}

.blog-card h2 a {
  color: var(--text-primary);
}

.blog-card h2 a:hover {
  color: var(--accent);
}

.blog-date {
  margin-bottom: var(--space-xs);
  color: var(--accent-secondary);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.02em;
}

.blog-excerpt,
.blog-empty p {
  max-width: none;
}

.blog-empty {
  margin-top: var(--space-lg);
}

.blog-empty h2 {
  font-size: 1.25rem;
  margin-bottom: var(--space-sm);
}

.blog-post-page {
  padding-top: calc(var(--nav-height) + var(--space-2xl));
}

.post-shell {
  max-width: var(--content-width);
  margin: 0 auto;
}

.post-dek {
  max-width: 62ch;
  color: var(--text-secondary);
  font-size: 1.05rem;
  line-height: 1.7;
  margin-top: var(--space-md);
}

.post-meta-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-sm);
  margin: var(--space-lg) 0 0;
}

.post-summary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--space-md);
  margin: var(--space-xl) 0 0;
}

.post-summary-card {
  min-height: 112px;
  padding: var(--space-lg);
  border: 1px solid var(--border);
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(0, 229, 204, 0.08), rgba(123, 97, 255, 0.06)),
    var(--bg-card);
}

.post-summary-card strong {
  display: block;
  margin-bottom: var(--space-xs);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.post-summary-card span {
  color: rgba(232, 240, 254, 0.84);
  font-size: 0.9rem;
  line-height: 1.55;
}

.post-body {
  margin-top: var(--space-2xl);
}

.post-body > p:first-child {
  color: rgba(248, 251, 255, 0.94);
  font-size: 1.08rem;
}

.post-body h2,
.post-body h3 {
  margin-top: var(--space-xl);
  margin-bottom: var(--space-md);
}

.post-body p,
.post-body li {
  color: rgba(232, 240, 254, 0.84);
}

.post-body ul,
.post-body ol {
  margin: 0 0 var(--space-lg) var(--space-lg);
  color: var(--text-secondary);
}

.post-body li + li {
  margin-top: var(--space-xs);
}

.post-callout {
  margin: var(--space-xl) 0;
  padding: var(--space-lg);
  border: 1px solid var(--border-accent);
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(0, 229, 204, 0.11), rgba(123, 97, 255, 0.08)),
    rgba(12, 18, 32, 0.82);
  box-shadow: 0 12px 34px rgba(0, 0, 0, 0.22);
}

.post-callout p {
  max-width: none;
  margin-bottom: 0;
  color: rgba(248, 251, 255, 0.95);
}

.post-callout strong {
  color: var(--accent);
}

.post-body code {
  padding: 0.1rem 0.28rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg-secondary);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.9em;
}

.post-body pre {
  overflow-x: auto;
  margin: var(--space-lg) 0;
  padding: var(--space-lg);
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-secondary);
}

.post-body pre code {
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--text-primary);
}

.post-body pre.post-code-wrap,
.post-body pre.post-code-wrap code {
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.post-body img {
  display: block;
  width: 100%;
  height: auto;
  margin: var(--space-xl) 0;
  border: 1px solid var(--border);
  border-radius: 8px;
}

.status-tag {
  display: inline-block;
  padding: 2px 8px;
  background: rgba(123, 97, 255, 0.12);
  color: var(--accent-secondary);
  border: 1px solid rgba(123, 97, 255, 0.3);
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-left: var(--space-sm);
  vertical-align: middle;
}

/* --- Timeline --- */
.timeline {
  position: relative;
  padding-left: var(--space-xl);
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.75rem;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent), var(--accent-secondary), transparent);
}

.timeline-item {
  position: relative;
  margin-bottom: var(--space-xl);
  padding: var(--space-lg);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  transition: all var(--transition-fast);
}

.timeline-item:hover {
  border-color: var(--border-accent);
  box-shadow: 0 0 20px var(--glow);
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: calc(-1 * var(--space-xl) - 5px);
  top: 1.5rem;
  width: 12px;
  height: 12px;
  background: var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--glow-strong);
}

.timeline-dates {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  margin-bottom: var(--space-xs);
  letter-spacing: 0.03em;
}

.timeline-role {
  font-weight: 600;
  margin-bottom: var(--space-xs);
  font-size: 1rem;
}

.timeline-org {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  margin-bottom: var(--space-sm);
}

.timeline-bullets {
  list-style: none;
  font-size: 0.9375rem;
}

.timeline-bullets li {
  position: relative;
  padding-left: var(--space-md);
  margin-bottom: var(--space-xs);
  color: var(--text-secondary);
  line-height: 1.6;
}

.timeline-bullets li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--accent);
}

/* --- Skills Grid --- */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-xl);
}

.skill-category h4 {
  margin-bottom: var(--space-sm);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
}

.skill-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

/* --- CV Section --- */
.cv-download {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  color: #0A0E17;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.9375rem;
  transition: all var(--transition-fast);
  box-shadow: 0 4px 16px var(--glow);
}

.cv-download:hover {
  opacity: 0.9;
  text-decoration: none;
  color: #0A0E17;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px var(--glow-strong);
}

.cv-download svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

/* Email obfuscation */
.email-obfuscated {
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border-accent);
  border-radius: 8px;
  display: inline-block;
  user-select: all;
  color: var(--accent);
  box-shadow: 0 0 12px var(--glow);
}

/* --- Message Forms --- */
.contact-grid {
  display: grid;
  grid-template-columns: minmax(220px, 0.8fr) minmax(300px, 1.2fr);
  gap: var(--space-xl);
  align-items: start;
}

.contact-copy p:last-child {
  margin-bottom: 0;
}

.message-card {
  padding: var(--space-xl);
  background:
    linear-gradient(135deg, rgba(0, 229, 204, 0.06), rgba(123, 97, 255, 0.06)),
    var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.16);
}

.message-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-md);
}

.form-field {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.form-field span {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent);
}

.form-field input,
.form-field textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: rgba(10, 14, 23, 0.64);
  color: var(--text-primary);
  padding: 11px 12px;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}

.form-field textarea {
  min-height: 150px;
  resize: vertical;
  line-height: 1.55;
}

.form-field input::placeholder,
.form-field textarea::placeholder {
  color: var(--text-tertiary);
}

.form-field input:focus,
.form-field textarea:focus {
  outline: none;
  border-color: var(--border-accent);
  background: rgba(10, 14, 23, 0.84);
  box-shadow: 0 0 0 3px var(--accent-subtle), 0 0 18px var(--glow);
}

.message-honeypot {
  position: absolute;
  left: -10000px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.form-actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  flex-wrap: wrap;
  min-height: 44px;
}

.form-submit,
.text-button {
  border: 0;
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), opacity var(--transition-fast);
}

.form-submit {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 10px 18px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  color: #0A0E17;
  font-weight: 700;
  box-shadow: 0 8px 24px var(--glow);
}

.form-submit:hover,
.form-submit:focus-visible {
  transform: translateY(-1px);
  box-shadow: 0 12px 28px var(--glow-strong);
}

.form-submit:disabled {
  cursor: wait;
  opacity: 0.68;
  transform: none;
}

.text-button {
  padding: 8px 12px;
  border-radius: 8px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.text-button:hover,
.text-button:focus-visible {
  color: var(--accent);
  border-color: var(--border-accent);
  box-shadow: 0 0 16px var(--glow);
}

.form-status {
  margin: 0;
  min-height: 1.4em;
  font-size: 0.875rem;
  color: var(--text-tertiary);
}

.form-status.is-success {
  color: var(--accent);
}

.form-status.is-error {
  color: var(--accent-tertiary);
}

.private-page section {
  padding-top: calc(var(--nav-height) + var(--space-3xl));
  padding-bottom: var(--space-2xl);
}

.private-shell {
  max-width: 760px;
  margin: 0 auto;
}

.private-heading {
  margin-bottom: var(--space-xl);
}

.private-heading .section-number {
  display: inline-flex;
  margin-bottom: var(--space-md);
}

.private-heading h1 {
  margin-bottom: var(--space-sm);
}

.private-panel {
  position: relative;
  overflow: hidden;
}

.private-panel + .private-panel {
  margin-top: var(--space-lg);
}

.private-panel-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.private-panel-header h2 {
  margin-bottom: var(--space-xs);
  font-size: 1.375rem;
}

.private-panel-header p {
  margin-bottom: 0;
  font-size: 0.9375rem;
}

/* --- Clean Visual Mode --- */
.clean-mode body {
  background-image:
    radial-gradient(ellipse at 18% 18%, rgba(75, 61, 132, 0.1) 0%, transparent 42%),
    radial-gradient(ellipse at 86% 18%, rgba(147, 86, 56, 0.08) 0%, transparent 44%),
    linear-gradient(180deg, #02040D 0%, #070B16 48%, #02040D 100%);
}

.clean-mode .particle-canvas,
.clean-mode .solar-system-canvas,
.clean-mode .tilt-glare,
.clean-mode .hero::after,
.clean-mode .project-card[data-tilt]::after,
.clean-mode .code-nexus-visual::after {
  display: none !important;
}

.clean-mode .fade-in,
.clean-mode .fade-in-stagger > *,
.clean-mode.supports-scroll-animations .fade-in,
.clean-mode.supports-scroll-animations .fade-in-stagger > * {
  opacity: 1 !important;
  transform: none !important;
  animation: none !important;
  transition: none !important;
}

.clean-mode .card,
.clean-mode .timeline-item,
.clean-mode .message-card,
.clean-mode .project-card[data-tilt] {
  transform: none !important;
  box-shadow: none;
}

.clean-mode .card:hover,
.clean-mode .timeline-item:hover,
.clean-mode .project-card[data-tilt].tilt-active {
  transform: none !important;
  box-shadow: 0 0 0 1px rgba(0, 229, 204, 0.1);
}

.clean-mode .hero-profile,
.clean-mode .hero-profile.float-animate {
  animation: none !important;
  transform: none !important;
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.28);
}

.clean-mode .tw-cursor,
.clean-mode .tw-char,
.clean-mode .graph-node,
.clean-mode .graph-edge,
.clean-mode .profile-football {
  animation: none !important;
}

.clean-mode #globe-container {
  height: auto !important;
  min-height: 0;
}

.clean-mode #globe-container canvas,
.clean-mode .globe-label {
  display: none !important;
}

.clean-mode #globe-fallback {
  display: flex !important;
}

.clean-mode .mode-toggle::before {
  background: var(--accent-secondary);
  box-shadow: 0 0 10px rgba(123, 97, 255, 0.35);
}

/* --- Footer --- */
.footer {
  padding: var(--space-2xl) 0;
  text-align: center;
  border-top: 1px solid var(--border);
  margin-top: var(--space-3xl);
  background: var(--bg-secondary);
}

.footer p {
  font-size: 0.875rem;
  color: var(--text-tertiary);
  margin: 0 auto;
  max-width: none;
}

/* --- Animations --- */
.fade-in {
  opacity: 1;
  transform: translateY(0);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.supports-scroll-animations .fade-in {
  opacity: 0;
  transform: translateY(16px);
  animation: fadeInFailsafe 1ms linear 1.2s forwards;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
  animation: none;
}

/* --- Typewriter Effect --- */
.tw-cursor {
  display: inline-block;
  width: 2px;
  height: 1em;
  background: var(--accent);
  margin-left: 1px;
  vertical-align: text-bottom;
  animation: blink 1s step-end infinite;
  box-shadow: 0 0 8px var(--glow);
}

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

.tw-char {
  opacity: 0;
  animation: charReveal 0.05s forwards;
}

@keyframes charReveal {
  to { opacity: 1; }
}

/* --- 3D Card Tilt --- */
.projects-grid {
  perspective: 1000px;
}

.project-card[data-tilt] {
  transform-style: preserve-3d;
  cursor: default;
}

.project-card[data-tilt]::after {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: 13px;
  background: linear-gradient(
    135deg,
    var(--accent) 0%,
    var(--accent-secondary) 50%,
    var(--accent-tertiary) 100%
  );
  opacity: 0;
  z-index: -1;
  transition: opacity 0.3s ease;
  filter: blur(6px);
}

.project-card[data-tilt].tilt-active::after {
  opacity: 0.6;
  animation: borderPulse 2s ease-in-out infinite;
}

@keyframes borderPulse {
  0%, 100% { opacity: 0.3; filter: blur(4px); }
  50% { opacity: 0.7; filter: blur(8px); }
}

/* --- Globe Container --- */
#globe-container {
  border-radius: 16px;
  overflow: hidden;
}

#globe-container canvas {
  display: block;
}

.globe-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  backdrop-filter: blur(8px);
  transition: background 0.2s;
}

.globe-label:hover {
  background: rgba(0, 229, 204, 0.2) !important;
  cursor: pointer;
}

.fade-in-stagger > * {
  opacity: 1;
  transform: translateY(0);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.supports-scroll-animations .fade-in-stagger > * {
  opacity: 0;
  transform: translateY(12px);
  animation: fadeInFailsafe 1ms linear 1.2s forwards;
}

.fade-in-stagger.visible > *:nth-child(1) { transition-delay: 0ms; opacity: 1; transform: translateY(0); }
.fade-in-stagger.visible > *:nth-child(2) { transition-delay: 80ms; opacity: 1; transform: translateY(0); }
.fade-in-stagger.visible > *:nth-child(3) { transition-delay: 160ms; opacity: 1; transform: translateY(0); }
.fade-in-stagger.visible > *:nth-child(4) { transition-delay: 240ms; opacity: 1; transform: translateY(0); }
.fade-in-stagger.visible > *:nth-child(5) { transition-delay: 320ms; opacity: 1; transform: translateY(0); }
.fade-in-stagger.visible > *:nth-child(6) { transition-delay: 400ms; opacity: 1; transform: translateY(0); }
.fade-in-stagger.visible > *:nth-child(7) { transition-delay: 480ms; opacity: 1; transform: translateY(0); }
.fade-in-stagger.visible > *:nth-child(8) { transition-delay: 560ms; opacity: 1; transform: translateY(0); }

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

/* --- Responsive --- */
@media (max-width: 768px) {
  :root {
    --nav-height: 56px;
  }

  .hero {
    min-height: auto;
    padding-top: calc(var(--nav-height) + var(--space-xl));
    padding-bottom: var(--space-2xl);
  }

  .hero-content {
    text-align: center;
    max-width: 100%;
  }

  .hero-profile {
    width: 110px;
    height: 110px;
    margin: var(--space-md) auto var(--space-lg);
  }

  .hero-links {
    justify-content: center;
  }

  .hero::before {
    opacity: 0.4;
    width: 100%;
  }

  .nav-links {
    gap: var(--space-sm);
  }

  .nav-links a {
    font-size: 0.76rem;
  }

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

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

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

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

  .message-card {
    padding: var(--space-lg);
  }

  .private-panel-header {
    flex-direction: column;
  }

  section {
    padding: var(--space-2xl) 0;
  }

  .container {
    padding: 0 var(--space-md);
  }
}

@media (max-width: 480px) {
  .nav-inner {
    gap: var(--space-sm);
    padding: 0 var(--space-sm);
  }

  .nav-logo {
    max-width: 4.8rem;
    font-size: 0.875rem;
    line-height: 1.15;
  }

  .nav-links {
    gap: 0.44rem;
  }

  .nav-links a {
    font-size: 0.64rem;
  }

  .nav-contact {
    display: none;
  }

  .mode-toggle {
    min-width: 46px;
    min-height: 26px;
    padding: 4px 6px;
    font-size: 0.6rem;
  }

  .mode-toggle::before {
    width: 5px;
    height: 5px;
    margin-right: 4px;
  }

  .hero-profile {
    width: 104px;
    height: 104px;
  }

  .metric-chip {
    font-size: 0.65rem;
    padding: 3px 8px;
  }
}

/* --- Utility Classes --- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* --- Print Styles --- */
@media print {
  body {
    background: white;
    background-image: none;
  }
  .nav, .hero::before, .hero::after, .solar-system-canvas {
    display: none;
  }
  section {
    padding: var(--space-lg) 0;
  }
  .card {
    border: 1px solid #ccc;
    box-shadow: none;
  }
}