:root {
  color-scheme: light dark;
  --bg: #0a0e27;
  --surface: #151938;
  --surface-elevated: #1e2447;
  --ink: #e7ebf1;
  --muted: #a0a8c5;
  --accent-red: #ff6b6b;
  --accent-purple: #a78bfa;
  --accent-blue: #60a5fa;
  --accent-cyan: #22d3ee;
  --accent-pink: #f472b6;
  --link: color-mix(in oklab, var(--accent-purple), white 15%);
  --border: color-mix(in oklab, var(--accent-purple), transparent 85%);
  --glow: color-mix(in oklab, var(--accent-purple), transparent 70%);
  --rail-w: 150px;
  --content-max: 78rem;
  --radius: 1.25rem;
  --radius-sm: 0.75rem;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2.5rem;
  --spacing-xl: 4rem;
  --font-base: 1rem;
  --font-sm: 0.875rem;
  --font-lg: 1.125rem;
  --font-xl: 1.35rem;
  --font-2xl: 1.75rem;
  --font-3xl: 2.25rem;
  --font-4xl: 3rem;
  --transition-fast: 200ms;
  --transition-base: 350ms;
  --transition-slow: 500ms;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f8fafc;
    --surface: #ffffff;
    --surface-elevated: #f1f5f9;
    --ink: #0f172a;
    --muted: #64748b;
    --border: color-mix(in oklab, var(--accent-purple), transparent 80%);
  }
}

/* Dark theme override */
:root[data-theme="dark"] {
    --bg: #0a0e27;
    --surface: #151938;
    --surface-elevated: #1e2447;
    --ink: #e7ebf1;
    --muted: #a0a8c5;
    --border: color-mix(in oklab, var(--accent-purple), transparent 85%);
}

/* Light theme explicit */
:root[data-theme="light"] {
    --bg: #f8fafc;
    --surface: #ffffff;
    --surface-elevated: #f1f5f9;
    --ink: #0f172a;
    --muted: #64748b;
    --border: color-mix(in oklab, var(--accent-purple), transparent 80%);
  
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  line-height: 1.7;
  font-size: clamp(15px, 1vw, 17px);
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(circle at 20% 50%, color-mix(in oklab, var(--accent-purple), transparent 92%) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, color-mix(in oklab, var(--accent-cyan), transparent 94%) 0%, transparent 50%),
    radial-gradient(circle at 40% 20%, color-mix(in oklab, var(--accent-pink), transparent 95%) 0%, transparent 50%);
  animation: gradientShift 20s ease infinite;
  pointer-events: none;
  z-index: 0;
}

@keyframes gradientShift {
  0%, 100% { opacity: 0.3; transform: scale(1) rotate(0deg); }
  50% { opacity: 0.5; transform: scale(1.1) rotate(5deg); }
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.2;
  font-weight: 800;
  margin-block-start: 0;
  margin-block-end: var(--spacing-md);
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(var(--font-3xl), 5vw, var(--font-4xl));
  background: linear-gradient(135deg, var(--accent-purple) 0%, var(--accent-pink) 50%, var(--accent-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-block-end: var(--spacing-lg);
  position: relative;
  animation: shimmer 3s ease-in-out infinite;
  background-size: 200% 200%;
}

@keyframes shimmer {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

h2 {
  font-size: clamp(var(--font-2xl), 3vw, var(--font-3xl));
  color: var(--ink);
  position: relative;
  padding-block-end: var(--spacing-sm);
  margin-block-end: var(--spacing-lg);
}
h2::after {
  content: '';
  position: absolute;
  inset-block-end: 0;
  inset-inline-start: 0;
  inline-size: 4rem;
  block-size: 4px;
  background: linear-gradient(90deg, var(--accent-purple), var(--accent-cyan));
  border-radius: 2px;
}

h3 {
  font-size: clamp(var(--font-xl), 2vw, var(--font-2xl));
  background: linear-gradient(135deg, var(--accent-purple), var(--accent-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

p { margin-block: var(--spacing-sm); line-height: 1.8; }
.lede { font-size: var(--font-lg); color: var(--muted); font-weight: 500; }

a {
  color: var(--link);
  text-decoration: none;
  position: relative;
  transition: color var(--transition-fast) ease;
}
a::after {
  content: '';
  position: absolute;
  inset-block-end: -2px;
  inset-inline-start: 0;
  inline-size: 0;
  block-size: 2px;
  background: linear-gradient(90deg, var(--accent-purple), var(--accent-cyan));
  transition: inline-size var(--transition-base) ease;
}
a:hover { color: var(--accent-purple); }
a:hover::after { inline-size: 100%; }
a:focus-visible { outline: 2px solid var(--accent-purple); outline-offset: 4px; border-radius: var(--radius-sm); }

strong, b { font-weight: 700; color: var(--ink); }
em, i { font-style: italic; color: var(--accent-purple); }
small { font-size: var(--font-sm); color: var(--muted); }

section { margin-block-end: var(--spacing-xl); animation: fadeInUp var(--transition-slow) ease-out both; position: relative; z-index: 1; }
@keyframes fadeInUp { from { opacity: 0; transform: translateY(2rem);} to { opacity: 1; transform: translateY(0);} }

header { margin-block-end: var(--spacing-xl); padding-block-end: var(--spacing-lg); }

footer {
  margin-block-start: var(--spacing-xl);
  padding-block: var(--spacing-lg);
  text-align: center;
  color: var(--muted);
  font-size: var(--font-sm);
  position: relative;
}
footer::before {
  content: '';
  position: absolute;
  inset-block-start: 0;
  inset-inline-start: 50%;
  transform: translateX(-50%);
  inline-size: 80%;
  block-size: 1px;
  background: linear-gradient(90deg, transparent, var(--border), transparent);
}

project-card {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--spacing-lg);
  margin-block: var(--spacing-md);
  position: relative;
  transform-style: preserve-3d;
  transition: all var(--transition-base) ease;
}
project-card::before {
  content: '';
  position: absolute;
  inset: -1px;
  background: linear-gradient(135deg, var(--accent-purple), var(--accent-cyan));
  border-radius: inherit;
  opacity: 0;
  z-index: -1;
  transition: opacity var(--transition-base) ease;
  pointer-events: none;
}
project-card:hover {
  transform: translateY(-8px) rotateX(2deg);
  box-shadow:
    0 20px 40px color-mix(in oklab, var(--accent-purple), transparent 80%),
    0 0 80px color-mix(in oklab, var(--accent-purple), transparent 90%);
  border-color: var(--accent-purple);
}
project-card:hover::before { opacity: 0.2; }
project-card a { position: relative; z-index: 1; }

article {
  background: color-mix(in oklab, var(--surface), transparent 10%);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--spacing-lg);
  margin-block-end: var(--spacing-lg);
  position: relative;
  overflow: hidden;
  transition: all var(--transition-base) ease;
}
article::before {
  content: '';
  position: absolute;
  inset-block-start: 0;
  inset-inline-start: -100%;
  inline-size: 100%;
  block-size: 100%;
  background: linear-gradient(90deg, transparent, color-mix(in oklab, var(--accent-purple), transparent 90%), transparent);
  transition: inset-inline-start 0.6s ease;
  pointer-events: none;
}
article:hover {
  border-color: var(--accent-purple);
  box-shadow: 0 8px 32px color-mix(in oklab, var(--accent-purple), transparent 85%);
  transform: translateY(-4px);
}
article:hover::before { inset-inline-start: 100%; }
article h3 { margin-block-start: 0; }
article p { color: var(--muted); }

ul, ol { padding-inline-start: var(--spacing-md); margin-block: var(--spacing-md); }
ul li, ol li {
  margin-block-end: var(--spacing-sm);
  color: var(--ink);
  position: relative;
  padding-inline-start: 0.5rem;
}
ul li::marker, ol li::marker { color: var(--accent-purple); font-weight: 700; }

img { max-inline-size: 100%; block-size: auto; border-radius: var(--radius); transition: all var(--transition-base) ease; }
img:hover { transform: scale(1.02) rotate(0.5deg); box-shadow: 0 12px 40px color-mix(in oklab, var(--accent-purple), transparent 75%); }
picture { display: block; margin-block: var(--spacing-lg); }
picture img { inline-size: 100%; block-size: auto; object-fit: cover; border-radius: var(--radius); }
figure { margin: 0; }
figure figcaption { margin-block-start: var(--spacing-sm); text-align: center; color: var(--muted); font-size: var(--font-sm); font-style: italic; }
svg { display: block; max-inline-size: 100%; block-size: auto; }

form { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: var(--spacing-lg); }
fieldset { border: none; padding: 0; margin: 0; }
fieldset legend {
  font-size: var(--font-xl);
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent-purple), var(--accent-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-block-end: var(--spacing-md);
}
label { display: block; font-weight: 600; margin-block-start: var(--spacing-md); margin-block-end: var(--spacing-xs); color: var(--ink); }

input[type="text"], input[type="email"], textarea {
  inline-size: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  color: var(--ink);
  font-family: inherit;
  font-size: var(--font-base);
  transition: all var(--transition-base) ease;
}
input[type="text"]:focus, input[type="email"]:focus, textarea:focus {
  outline: none;
  border-color: var(--accent-purple);
  box-shadow: 0 0 0 4px color-mix(in oklab, var(--accent-purple), transparent 90%),
              0 8px 16px color-mix(in oklab, var(--accent-purple), transparent 85%);
  transform: translateY(-2px);
}
input::placeholder, textarea::placeholder { color: var(--muted); opacity: 0.6; }
textarea { resize: vertical; min-block-size: 10rem; line-height: 1.6; }

button {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  margin-block-start: var(--spacing-md);
  background: linear-gradient(135deg, var(--accent-purple) 0%, var(--accent-cyan) 100%);
  color: white;
  font-weight: 700;
  font-size: var(--font-base);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: all var(--transition-base) ease;
}
button::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--accent-cyan) 0%, var(--accent-purple) 100%);
  opacity: 0;
  transition: opacity var(--transition-base) ease;
}
button::after {
  content: '';
  position: absolute;
  inset-block-start: 50%;
  inset-inline-start: 50%;
  inline-size: 0;
  block-size: 0;
  border-radius: 50%;
  background: white;
  opacity: 0.5;
  transform: translate(-50%, -50%);
  transition: inline-size 0.6s ease, block-size 0.6s ease;
}
button:hover { transform: translateY(-4px) scale(1.02); box-shadow: 0 12px 32px color-mix(in oklab, var(--accent-purple), transparent 70%); }
button:hover::before { opacity: 1; }
button:active::after { inline-size: 300px; block-size: 300px; opacity: 0; transition: 0s; }
button:focus-visible { outline: 2px solid var(--accent-purple); outline-offset: 4px; }
button > * { position: relative; z-index: 1; }

noscript {
  display: block;
  background: color-mix(in oklab, var(--accent-red), transparent 85%);
  color: var(--accent-red);
  padding: var(--spacing-sm);
  border-radius: var(--radius-sm);
  text-align: center;
  margin-block-end: var(--spacing-md);
  border: 1px solid var(--accent-red);
}

/* Shared utilities */
.actions { margin-block-start: var(--spacing-md); }
.link-primary {
  font-weight: 700;
  color: var(--accent-purple);
  text-decoration: none;
  position: relative;
  padding-inline-end: 1.5em;
}
.link-primary::after {
  content: '→';
  position: absolute;
  inset-inline-end: 0;
  transition: transform var(--transition-fast) ease;
}
.link-primary:hover::after { transform: translateX(0.25em); }

@media (max-width: 820px) {
  :root { --spacing-xl: 2.5rem; --spacing-lg: 2rem; }
  h1 { font-size: var(--font-3xl); }
  h2 { font-size: var(--font-2xl); }
  section { margin-block-end: var(--spacing-lg); }
  article { padding: var(--spacing-md); }
}

@media (max-width: 480px) {
  :root { --spacing-xl: 2rem; --spacing-lg: 1.5rem; --spacing-md: 1rem; }
  h1 { font-size: var(--font-2xl); }
  article, project-card { padding: var(--spacing-sm); }
  button { inline-size: 100%; }
}

@media print {
  body::before { display: none; }
  .rail { display: none; }
  .frame { grid-template-columns: 1fr; }
  .content { max-inline-size: 100%; }
}