/* ===== Design tokens ===== */
:root {
  --bg: #0b0c10;
  --card: #111318;
  --elev: rgba(255,255,255,0.06);
  --text: #e9edf1;
  --muted: #b7c0ca;
  --accent: #39bfff; /* stronger */
  --accent-2: #7a63ff;
  --ring: rgba(91,212,255,0.45);
  --grad-1: linear-gradient(90deg, rgba(91,212,255,0.35), rgba(155,125,255,0.35));
  --section-pill: rgba(45, 155, 255, 0.24); /* solid-ish, not gradient */
  --name-grad: linear-gradient(90deg, #1fb4ff 0%, #00e0ff 100%); /* bold teal->cyan */
  --name-stroke: rgba(0,0,0,0.5);
}

:root.light {
  --bg: #ffffff;
  --card: #f7f8fb;
  --elev: rgba(0,0,0,0.08);
  --text: #0a0f16;
  --muted: #3d4854;
  --accent: #0b61c3; /* deeper for contrast */
  --accent-2: #4d36ff;
  --ring: rgba(0,95,163,0.25);
  --grad-1: linear-gradient(90deg, rgba(0,95,163,0.10), rgba(77,54,255,0.10));
  --section-pill: rgba(11, 97, 195, 0.15); /* solid navy tint */
  --name-grad: linear-gradient(90deg, #003b73 0%, #0b61c3 100%); /* navy -> royal blue */
  --name-stroke: rgba(255,255,255,0.35);
}

/* ===== Base ===== */
* { box-sizing: border-box; }
html, body { height: 100%; scroll-behavior: smooth; }
html { scroll-padding-top: 80px; }
body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, 'Helvetica Neue', Arial, 'Noto Sans', 'Apple Color Emoji', 'Segoe UI Emoji';
  background:
    radial-gradient(1200px 800px at 10% -10%, rgba(91,212,255,0.13), transparent 50%),
    radial-gradient(1000px 700px at 120% 10%, rgba(155,125,255,0.12), transparent 45%),
    var(--bg);
  color: var(--text);
  line-height: 1.6;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; display: block; border-radius: 16px; }

.container { width: min(1100px, 92%); margin-inline: auto; }

/* ===== Nav (auto-hide) ===== */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  backdrop-filter: blur(8px);
  background: color-mix(in oklab, var(--bg), transparent 28%);
  border-bottom: 1px solid var(--elev);
  padding: 14px clamp(12px, 4vw, 24px);
  transform: translateY(0);
  transition: transform .35s ease, background .2s ease, border-color .2s ease;
}
.nav.nav--hidden { transform: translateY(-100%); }
.nav:hover { transform: translateY(0) !important; }
.brand { font-weight: 900; letter-spacing: 0.2px; color: var(--text); }
.nav-links { display:flex; gap: clamp(12px, 3vw, 22px); align-items: center; }
.nav-links a { color: var(--text); opacity: 0.85; font-weight: 700; position: relative; }
.nav-links a:hover { opacity: 1; }

/* Scrollspy gradient accent (keep as-is) */
.nav-links a.active {
  background: var(--grad-1);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.nav-links a.active::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -6px;
  height: 2px;
  background: var(--grad-1);
  border-radius: 999px;
}

/* Toggle switch */
.switch { position: relative; display: inline-block; width: 48px; height: 26px; }
.switch input { opacity: 0; width: 0; height: 0; }
.slider {
  position: absolute; cursor: pointer; inset: 0;
  background: var(--card); border: 1px solid var(--elev); border-radius: 999px;
  transition: background .2s ease;
}
.slider:before {
  content: ""; position: absolute; height: 20px; width: 20px;
  left: 3px; top: 50%; transform: translateY(-50%);
  background: var(--text); border-radius: 50%;
  box-shadow: 0 2px 8px rgba(0,0,0,0.25);
  transition: transform .2s ease;
}
.switch input:checked + .slider { background: linear-gradient(180deg, var(--accent), color-mix(in oklab, var(--accent), black 10%)); }
.switch input:checked + .slider:before { transform: translate(22px, -50%); }

/* ===== Hero ===== */
.hero { padding: clamp(64px, 11vw, 110px) 0; }
.hero-grid { display:grid; grid-template-columns: 1.1fr 0.9fr; gap: clamp(24px, 4vw, 44px); align-items: center; }
.headline { font-size: clamp(32px, 6vw, 56px); margin: 0 0 10px; font-weight: 900; letter-spacing: -0.02em; }
/* Reimagined name gradient: high contrast + stroke for readability */
.headline .accent {
  -webkit-text-stroke: 0px transparent; /* removed stroke to avoid artifacts */
  -webkit-text-fill-color: transparent;
  text-shadow: 0 1px 1px rgba(0,0,0,0.18);
  background: var(--name-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;

}
.lead { font-size: clamp(16px, 2.2vw, 18px); color: var(--muted); }
.cta-row { display:flex; gap: 12px; margin-top: 18px; }

.btn {
  display:inline-block; border: 1px solid var(--elev);
  background: linear-gradient(180deg, var(--accent), color-mix(in oklab, var(--accent), black 10%));
  color: white; font-weight: 800; padding: 10px 16px; border-radius: 12px;
  box-shadow: 0 8px 24px var(--ring);
}
.btn:hover { transform: translateY(-1px); box-shadow: 0 12px 26px var(--ring); }
.btn-ghost {
  background: var(--card); color: var(--text); border:1px solid var(--elev);
  box-shadow: none;
}

/* ===== Sections ===== */
.section { padding: clamp(56px, 8vw, 96px) 0; }
.section-title { margin: 0 0 18px; font-weight: 900; letter-spacing: -0.01em; font-size: clamp(24px, 3.5vw, 36px); }
.section-title > span {
  background: var(--section-pill); /* solid tint instead of gradient */
  padding: 6px 12px;
  border-radius: 999px;
  color: var(--text);
}
/* Ensure anchors don't hide beneath nav */
.section, .anchor-spacer { scroll-margin-top: 84px; }

/* Cards */
.card {
  background: linear-gradient(180deg, color-mix(in oklab, var(--card), transparent 0%), color-mix(in oklab, var(--card), black 0%));
  border: 1px solid var(--elev);
  border-radius: 16px;
  padding: clamp(16px, 2.8vw, 24px);
  box-shadow: 0 6px 18px color-mix(in oklab, var(--bg), black 10%);
}
.card.compact { padding: clamp(14px, 2.2vw, 20px); }
.card-header h3 { margin: 0 0 6px; font-size: 20px; }
.h3 { font-weight: 800; letter-spacing: -.01em; }
.h4 { font-weight: 800; letter-spacing: -.01em; }

.meta { color: var(--muted); margin: 0 0 10px; }

.tight { margin: 0; padding-left: 18px; }
.tight li { margin: 6px 0; }

.links { margin-top: 12px; }
.chip {
  display:inline-block; padding: 6px 10px; border-radius: 999px;
  background: color-mix(in oklab, var(--accent), transparent 85%);
  border: 1px solid var(--elev); color: var(--text); font-weight: 700;
}

/* ===== Skills & Tables ===== */
.skills-grid {
  display:grid; gap: 16px; grid-template-columns: repeat(3, minmax(0,1fr));
}
.table { display:grid; gap: 18px; }
.table.two-col { grid-template-columns: repeat(2, minmax(0,1fr)); }
.table.three-col { grid-template-columns: repeat(3, minmax(0,1fr)); }
.table-col h4 { margin: 0 0 8px; }
.table-col ul { padding-left: 18px; margin: 0; }
.table-col li { margin: 6px 0; }

/* Thoughtful spacing between the three coursework blocks */
.separator {
  height: 16px;
  margin: 28px auto;
  width: min(760px, 80%);
  background: var(--section-pill); /* keep solid tint here too */
  border-radius: 999px;
  opacity: .9;
}

/* ===== Contact ===== */
.contact-form { display:grid; gap: 14px; }
.form-row { display:flex; flex-direction:column; gap: 6px; }
input, textarea {
  background: var(--card); color: var(--text);
  border: 1px solid var(--elev); border-radius: 10px;
  padding: 10px 12px; font: inherit;
}
input:focus, textarea:focus { outline: 2px solid var(--ring); border-color: transparent; }

/* ===== Footer ===== */
.footer { border-top: 1px solid var(--elev); padding: 24px 0; margin-top: 24px; }
.footer-inner { display:flex; align-items:center; justify-content: space-between; gap: 12px; }
.back-to-top { color: var(--muted); }
.back-to-top:hover { color: var(--text); }

/* ===== Reveal Animations ===== */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity .6s ease, transform .6s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ===== Responsive ===== */
@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-media { order: -1; }
  .skills-grid { grid-template-columns: 1fr; }
  .table.two-col, .table.three-col { grid-template-columns: 1fr; }
}