:root{
  --bg: #ffffff;
  --text: #0a0a0a;
  --muted: #6b7280;
  --card: #f7f7f8;
  --accent: #0A84FF;
  --radius: 16px;
  --shadow: 0 10px 30px rgba(0,0,0,0.06);
}
:root.dark{
  --bg: #0b0b0c;
  --text: #f2f2f2;
  --muted: #a3a3a3;
  --card: #151517;
  --shadow: 0 10px 30px rgba(0,0,0,0.35);
}
*{ box-sizing: border-box; }
html,body{ height:100%; }
body{
  margin:0;
  background: var(--bg);
  color: var(--text);
  font-family: "SF Pro Display","SF Pro Text",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Inter,"Helvetica Neue",Arial,system-ui,"Apple Color Emoji","Segoe UI Emoji";
  line-height: 1.35;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
@media (prefers-reduced-motion: reduce){
  *{ animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}
img{ max-width:100%; height:auto; border-radius: 12px; }
.container{ width: min(1200px, 92vw); margin-inline:auto; }
/* Type scale */
.display-xxl{ font-size: clamp(44px, 8vw, 96px); font-weight: 700; letter-spacing:-0.02em; }
.display-xl{ font-size: clamp(30px, 5.4vw, 52px); font-weight: 700; letter-spacing:-0.01em; }
.display-md{ font-size: clamp(20px, 3.6vw, 30px); font-weight: 650; }
.subtitle{ font-size: clamp(16px, 2.4vw, 22px); color: var(--muted); }
.body-xl{ font-size: clamp(18px, 2.2vw, 20px); color: var(--text); }
.body-lg{ font-size: 18px; color: var(--muted); }
.tight{ margin-top: 4px; }
/* Layout helpers */
.stack > * + *{ margin-top: 16px; }
.stack.gap-lg > * + *{ margin-top: 28px; }
.stack.gap-xl > * + *{ margin-top: 44px; }
/* Header */
.site-header{ position: sticky; top:0; backdrop-filter: saturate(180%) blur(10px);
  background: color-mix(in srgb, var(--bg) 80%, transparent); border-bottom: 1px solid color-mix(in srgb, var(--text) 8%, transparent); z-index:100; }
.nav{ display:flex; align-items:center; justify-content:space-between; padding: 16px 0; }
.brand{ font-weight:700; text-decoration:none; color:var(--text); }
.primary-nav ul{ display:flex; gap: 24px; list-style:none; margin:0; padding:0; }
.primary-nav a{ text-decoration:none; color: var(--text); opacity: .85; }
.primary-nav a:hover{ opacity: 1; }
/* Mode toggle */
.mode-toggle{
  width: 50px; height: 28px; border-radius: 999px; position: relative; border: 1px solid color-mix(in srgb, var(--text) 20%, transparent);
  background: color-mix(in srgb, var(--bg) 85%, var(--text) 5%); cursor: pointer;
}
.mode-toggle .toggle-dot{
  position:absolute; top: 3px; left: 3px; width: 22px; height: 22px; border-radius: 50%; background: var(--text); transition: transform .25s ease;
}
:root.dark .mode-toggle .toggle-dot{ transform: translateX(22px); background: var(--accent); }
/* Hero */
.hero{ display:grid; grid-template-columns: 1.25fr 1fr; gap: 36px; padding: 92px 0; align-items:center; }
.hero .wave path{ fill: color-mix(in srgb, var(--accent) 26%, var(--card)); }
.hero .hero-visual{ filter: drop-shadow(var(--shadow)); will-change: transform; }
.hero-actions{ display:flex; gap: 12px; margin-top: 18px; }
.btn{ display:inline-flex; align-items:center; justify-content:center; padding: 12px 18px; border-radius: 12px; text-decoration:none; }
.btn-primary{ background: var(--accent); color:#fff; }
.btn-ghost{ border: 1px solid color-mix(in srgb, var(--text) 18%, transparent); color: var(--text); }
/* Cards & grids */
.card{ background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow); overflow:hidden; }
.card-link{ color: inherit; text-decoration:none; display:block; }
.card-body{ padding: 18px; }
.grid.projects{ display:grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.project-card{ background: var(--card); border-radius: var(--radius); overflow: hidden; text-decoration: none; color: inherit; box-shadow: var(--shadow); display:block; }
.project-thumb{ display:block; }
.project-meta{ padding: 14px 16px; }
.meta{ color: var(--muted); font-size: 14px; }
/* Split */
.split{ display:grid; grid-template-columns: 1fr 1fr; gap: 24px; align-items:center; }
.abstract-card{ background: var(--card); border-radius: var(--radius); height: 260px; position: relative; overflow: hidden; box-shadow: var(--shadow); will-change: transform; }
.abstract-card .blob{ position:absolute; inset: -20% -10% auto auto; width: 140%; height: 140%; background: radial-gradient(100px 120px at 30% 30%, color-mix(in srgb, var(--accent) 60%, transparent), transparent 60%), radial-gradient(120px 120px at 70% 60%, color-mix(in srgb, var(--accent) 30%, transparent), transparent 60%); filter: blur(30px) contrast(120%); }
/* Reveal */
.reveal{ opacity:0; transform: translateY(16px); transition: opacity .6s ease, transform .6s ease; }
.reveal-in{ opacity:1; transform:none; }
/* Footer */
.site-footer{ margin-top: 64px; padding: 40px 0; border-top: 1px solid color-mix(in srgb, var(--text) 10%, transparent); }
.footer-inner{ display:flex; justify-content:space-between; align-items:center; gap: 20px; }
.footer-left p{ margin:0; color: var(--muted); }
/* Responsive */
@media (max-width: 960px){
  .hero{ grid-template-columns: 1fr; }
  .grid.projects{ grid-template-columns: 1fr 1fr; }
  .split{ grid-template-columns: 1fr; }
}
@media (max-width: 640px){
  .grid.projects{ grid-template-columns: 1fr; }
}