/* ===== Design Tokens ===== */
:root {
  --page-padding: clamp(16px, 2vw, 28px);
  --container: min(1120px, 100% - var(--page-padding) * 2);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --shadow-1: 0 6px 18px rgba(0,0,0,.08);
  --shadow-2: 0 12px 32px rgba(0,0,0,.12);
  --backdrop: saturate(160%) blur(14px);
  --transition-fast: 160ms;
  --transition-slow: 360ms;

  /* Light theme */
  --bg: #ffffff;
  --surface: #f5f7fb;
  --text: #0b0d12;
  --muted: #5c6470;
  --primary: #0b84ff;
  --accent: #7a5cff;
  --glass-tint: rgba(255,255,255,.6);
  --stroke: rgba(15,23,42,.08);
}

html[data-theme="dark"] {
  --bg: #0b0d12;
  --surface: #0f1420;
  --text: #f3f6ff;
  --muted: #a6afc3;
  --primary: #4aa8ff;
  --accent: #9a86ff;
  --glass-tint: rgba(17, 22, 34, .55);
  --stroke: rgba(255,255,255,.08);
}

/* Liquid glass theme modifies background and elevates glass surfaces */
html[data-theme="glass"] {
  --bg: #0a0c11;
  --surface: rgba(255,255,255,.06);
  --text: #eef2ff;
  --muted: #b8c0d8;
  --primary: #6ac7ff;
  --accent: #a38bff;
  --glass-tint: rgba(255,255,255,.22);
  --stroke: rgba(255,255,255,.12);
}

/* ===== Base ===== */
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, 'Apple Color Emoji', 'Segoe UI Emoji';
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container { width: var(--container); margin-inline: auto; }

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

/* ===== Accessibility ===== */
.skip-link {
  position: absolute;
  left: -9999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}
.skip-link:focus {
  position: fixed;
  left: var(--page-padding);
  top: var(--page-padding);
  width: auto; height: auto; padding: 10px 14px;
  background: var(--surface);
  color: var(--text);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-1);
  z-index: 10000;
}

/* ===== Header ===== */
.site-header {
  position: sticky; top: 0; z-index: 1000;
  backdrop-filter: var(--backdrop);
  -webkit-backdrop-filter: var(--backdrop);
  background: color-mix(in oklab, var(--bg) 88%, transparent);
  border-bottom: 1px solid var(--stroke);
}
.header-inner {
  display: grid; grid-template-columns: 1fr auto auto; align-items: center;
  gap: 16px; padding: 14px 0;
}
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 700; }
.brand-logo { border-radius: 10px; box-shadow: var(--shadow-1); }
.brand-name { letter-spacing: 0.3px; }

.site-nav { position: relative; }
.nav-toggle {
  display: none;
  width: 40px; height: 36px; border-radius: 10px;
  background: var(--surface); border: 1px solid var(--stroke);
  place-items: center; gap: 3px; padding: 6px 8px;
}
.nav-toggle .bar { width: 18px; height: 2px; background: var(--text); display: block; }

.nav-menu { display: flex; gap: 20px; list-style: none; margin: 0; padding: 0; }
.nav-menu a { color: var(--text); text-decoration: none; opacity: .8; }
.nav-menu a:hover { opacity: 1; }

.theme-switcher { display: flex; gap: 8px; }
.theme-btn {
  border: 1px solid var(--stroke); background: var(--surface); color: var(--text);
  border-radius: 12px; padding: 8px 10px; cursor: pointer;
}
.theme-btn:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }

/* ===== Hero with Parallax ===== */
.hero {
  position: relative; min-height: 76svh; display: grid; align-items: center;
  overflow: clip;
}
.parallax { position: absolute; inset: 0; z-index: -1; pointer-events: none; }
.layer { position: absolute; inset: -10%; border-radius: 0; }
.l-back {
  background:
    radial-gradient(60% 60% at 10% 20%, color-mix(in oklab, var(--accent) 28%, transparent) 0%, transparent 60%),
    radial-gradient(50% 50% at 90% 30%, color-mix(in oklab, var(--primary) 24%, transparent) 0%, transparent 60%),
    linear-gradient(180deg, color-mix(in oklab, var(--bg) 100%, transparent), color-mix(in oklab, var(--bg) 100%, transparent));
}
.l-mid {
  background:
    radial-gradient(40% 40% at 70% 80%, color-mix(in oklab, var(--accent) 18%, transparent) 0%, transparent 60%);
}
.l-front {
  background:
    radial-gradient(28% 28% at 20% 80%, color-mix(in oklab, var(--primary) 18%, transparent) 0%, transparent 60%);
  mix-blend-mode: overlay;
}

.hero-inner { display: grid; grid-template-columns: 1.2fr .8fr; align-items: center; gap: 40px; padding: 72px 0; }
.hero h1 { font-size: clamp(28px, 5vw, 56px); line-height: 1.05; margin: 0 0 12px; letter-spacing: -0.02em; }
.lead { font-size: clamp(16px, 1.6vw, 20px); color: var(--muted); max-width: 64ch; margin: 0 0 16px; }

.cta { display: flex; gap: 12px; }
.btn { border-radius: 12px; border: 1px solid var(--stroke); background: var(--surface); color: var(--text); padding: 10px 16px; text-decoration: none; display: inline-flex; align-items: center; justify-content: center; }
.btn.primary { background: linear-gradient(180deg, color-mix(in oklab, var(--primary) 92%, white) 0%, var(--primary) 100%); color: white; border: none; }
.btn:hover { transform: translateY(-1px); box-shadow: var(--shadow-1); transition: transform var(--transition-fast), box-shadow var(--transition-fast); }

.hero-visual { display: grid; justify-items: end; }
.avatar-card { display: grid; grid-template-columns: auto 1fr; gap: 12px; align-items: center; }
.avatar { border-radius: 50%; box-shadow: var(--shadow-2); }
.avatar-meta { display: grid; }
.avatar-meta span { color: var(--muted); font-size: 14px; }

/* ===== Sections ===== */
.section { padding: 64px 0; }
.section h2 { font-size: clamp(22px, 2.6vw, 32px); margin: 0 0 18px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; align-items: start; }

.glass-card {
  background: color-mix(in oklab, var(--glass-tint) 100%, transparent);
  border: 1px solid var(--stroke);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-1);
  backdrop-filter: var(--backdrop);
  -webkit-backdrop-filter: var(--backdrop);
}

.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; padding: 18px; text-align: center; }
.stat { font-size: clamp(20px, 3vw, 28px); font-weight: 700; }
.label { color: var(--muted); font-size: 12px; }

/* Projects */
.projects-grid { display: grid; grid-template-columns: repeat(12, 1fr); gap: 18px; }
.project-card { grid-column: span 4; overflow: hidden; display: grid; }
.project-media { height: 160px; background: linear-gradient(135deg, color-mix(in oklab, var(--primary) 20%, transparent), color-mix(in oklab, var(--accent) 18%, transparent)); display: grid; place-items: center; }
.project-image { width: 80px; height: 80px; border-radius: 12px; object-fit: cover; }
.project-body { padding: 16px; display: grid; gap: 8px; }
.project-link { margin-top: 8px; }
.tags { display: flex; flex-wrap: wrap; gap: 8px; }
.tags span { font-size: 12px; padding: 6px 10px; border: 1px solid var(--stroke); border-radius: 999px; background: var(--surface); color: var(--muted); }

/* Notice */
.notice { padding: 18px; display: grid; gap: 6px; }
.muted { color: var(--muted); }

/* Shimmer */
@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}
.shimmer {
  background: linear-gradient(100deg, rgba(255,255,255,0) 20%, rgba(255,255,255,.18) 40%, rgba(255,255,255,0) 60%) , linear-gradient(135deg, color-mix(in oklab, var(--primary) 20%, transparent), color-mix(in oklab, var(--accent) 18%, transparent));
  background-size: 200% 100%, 100% 100%;
  animation: shimmer 2.2s infinite linear;
  mix-blend-mode: soft-light;
}

/* Skills */
.chip-list { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 10px; }
.chip-list li { padding: 8px 12px; border-radius: 999px; border: 1px solid var(--stroke); background: var(--surface); }

/* Contact */
.contact-form { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; padding: 18px; }
.contact-form label { display: grid; gap: 6px; font-size: 14px; }
.contact-form input, .contact-form textarea {
  border: 1px solid var(--stroke); background: var(--surface); color: var(--text);
  border-radius: 12px; padding: 10px 12px; font: inherit;
}
.contact-form .full { grid-column: 1 / -1; }

.contact-details { margin-top: 12px; padding: 12px; }
.contact-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.contact-list a { text-decoration: none; }

/* Footer */
.site-footer { border-top: 1px solid var(--stroke); padding: 28px 0; color: var(--muted); }

/* ===== Fade-in/out reveal ===== */
.fade-reveal { opacity: 0; transform: translateY(18px); transition: opacity var(--transition-slow) ease, transform var(--transition-slow) ease; transition-delay: var(--fade-delay, 0ms); }
.fade-reveal.is-visible { opacity: 1; transform: translateY(0); }

/* ===== Responsive ===== */
@media (max-width: 960px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-visual { justify-items: start; }
  .grid-2 { grid-template-columns: 1fr; }
  .projects-grid { grid-template-columns: repeat(6, 1fr); }
  .project-card { grid-column: span 3; }
}

@media (max-width: 720px) {
  .header-inner { grid-template-columns: auto auto 1fr; }
  .site-nav .nav-toggle { display: grid; }
  .nav-menu {
    position: absolute; right: 0; top: calc(100% + 8px);
    background: var(--surface); border: 1px solid var(--stroke); border-radius: 12px; padding: 10px; box-shadow: var(--shadow-1);
    display: none; flex-direction: column; gap: 10px; min-width: 180px;
  }
  .site-nav[aria-expanded="true"] #nav-menu { display: flex; }
  .theme-switcher { justify-self: end; }
  .contact-form { grid-template-columns: 1fr; }
  .projects-grid { grid-template-columns: repeat(2, 1fr); }
  .project-card { grid-column: span 2; }
}

/* ===== Glass theme background polish ===== */
html[data-theme="glass"] body {
  background:
    radial-gradient(1200px 600px at -10% -10%, rgba(255,255,255,.06), transparent 60%),
    radial-gradient(1200px 600px at 110% 10%, rgba(255,255,255,.03), transparent 60%),
    radial-gradient(600px 800px at 50% 110%, rgba(255,255,255,.04), transparent 60%),
    var(--bg);
}