:root,
html[data-theme="dark"] {
  --bg: #070b12;
  --bg-raise: #0e1624;
  --bg-raise-2: #121c2e;
  --ink: #e8eef8;
  --muted: #9aa8bd;
  --line: rgba(125, 211, 252, 0.18);
  --accent: #3ec6ff;
  --accent-2: #7cf0ff;
  --danger: #ff4d6d;
  --nav-bg: rgba(7, 11, 18, 0.82);
  --form-bg: #081018;
  --prose: #d5deea;
  --btn-on-accent: #041018;
  --glow: rgba(62, 198, 255, 0.12);
  --radius: 18px;
  --max: 1080px;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
  font-family: "Segoe UI", "IBM Plex Sans", system-ui, sans-serif;
}

html[data-theme="light"] {
  --bg: #f4f8fc;
  --bg-raise: #ffffff;
  --bg-raise-2: #eef4fa;
  --ink: #102033;
  --muted: #4d6076;
  --line: rgba(16, 50, 80, 0.16);
  --accent: #0077b6;
  --accent-2: #0284c7;
  --danger: #c81e3a;
  --nav-bg: rgba(244, 248, 252, 0.9);
  --form-bg: #ffffff;
  --prose: #243447;
  --btn-on-accent: #ffffff;
  --glow: rgba(2, 132, 199, 0.12);
  --shadow: 0 16px 40px rgba(16, 40, 70, 0.08);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background:
    radial-gradient(1200px 500px at 80% -10%, var(--glow), transparent 55%),
    var(--bg);
  color: var(--ink);
  line-height: 1.6;
}

img { max-width: 100%; height: auto; }
a { color: var(--accent-2); }
code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.92em;
  color: var(--accent-2);
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -40px;
  background: var(--accent);
  color: #041018;
  padding: 0.4rem 0.7rem;
  z-index: 20;
}
.skip-link:focus { top: 0.75rem; }

.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 6vw;
  background: var(--nav-bg);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--ink);
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0.02em;
}
.brand-mark {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, #fff, var(--accent) 45%, #0a3a55);
  box-shadow: 0 0 16px var(--accent);
}
.nav-links {
  display: flex;
  gap: 1.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-links a {
  color: var(--muted);
  text-decoration: none;
}
.nav-links a:hover,
.nav-links a:focus {
  color: var(--ink);
}
.nav-right {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-left: auto;
}
.theme-toggle {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: 999px;
  overflow: hidden;
}
.theme-toggle button {
  background: transparent;
  color: var(--muted);
  border: 0;
  padding: 0.35rem 0.75rem;
  font: inherit;
  font-size: 0.85rem;
  font-weight: 650;
  cursor: pointer;
}
.theme-toggle button[aria-pressed="true"] {
  background: var(--accent);
  color: var(--btn-on-accent);
}
.nav-toggle {
  display: none;
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.35rem 0.8rem;
}

.hero {
  max-width: var(--max);
  margin: 0 auto;
  padding: 4.5rem 6vw 3rem;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 2.5rem;
  align-items: center;
}
.eyebrow {
  text-transform: lowercase;
  letter-spacing: 0.18em;
  color: var(--accent);
  margin: 0 0 0.6rem;
  font-size: 0.82rem;
}
.hero h1 {
  font-size: clamp(2.4rem, 5vw, 4.2rem);
  line-height: 1.05;
  margin: 0 0 0.7rem;
}
.tagline {
  font-size: 1.25rem;
  margin: 0 0 0.4rem;
}
.sub { color: var(--muted); margin: 0 0 1.6rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.75rem; }
.hero-visual { text-align: center; }
.hero-media {
  position: relative;
  display: inline-block;
  width: min(420px, 100%);
}
.mascot {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 18px;
  background: #0b1522;
  filter: drop-shadow(0 20px 40px rgba(62, 198, 255, 0.25));
}
.sound-toggle {
  position: absolute;
  left: 50%;
  bottom: 12px;
  transform: translateX(-50%);
  border: 1px solid var(--line);
  background: var(--nav-bg);
  color: var(--ink);
  border-radius: 999px;
  padding: 0.35rem 0.8rem;
  font: inherit;
  font-size: 0.85rem;
  cursor: pointer;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 0.7rem 1.15rem;
  font-weight: 650;
  cursor: pointer;
}
.btn.primary {
  background: linear-gradient(180deg, var(--accent-2), var(--accent));
  color: var(--btn-on-accent);
}
.btn.ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}
.btn:hover { filter: brightness(1.08); }

.section {
  max-width: var(--max);
  margin: 0 auto;
  padding: 3.2rem 6vw;
  border-top: 1px solid var(--line);
}
.section h2 {
  margin: 0 0 1.2rem;
  font-size: 1.7rem;
}
.lede { color: var(--muted); max-width: 62ch; }
.prose { max-width: 68ch; color: var(--prose); }
.prose p + p { margin-top: 1rem; }

.cards {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 1.1rem;
}
.card, .panel {
  background: linear-gradient(180deg, var(--bg-raise), var(--bg-raise-2));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.3rem 1.35rem 1.4rem;
  box-shadow: var(--shadow);
}
.card.featured { outline: 1px solid rgba(62, 198, 255, 0.28); }
.card-kicker {
  margin: 0 0 0.35rem;
  color: var(--accent);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.card h3, .panel h3 { margin: 0 0 0.55rem; }
.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  list-style: none;
  padding: 0;
  margin: 1rem 0;
}
.chips li {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.2rem 0.65rem;
  font-size: 0.82rem;
  color: var(--muted);
}
.hint { color: var(--muted); font-size: 0.88rem; }

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.1rem;
}
.panel ul { padding-left: 1.1rem; color: var(--prose); }

.cert-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.7rem;
}
.cert-list li {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  background: var(--bg-raise);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 0.95rem 1.1rem;
}
.cert-list span { color: var(--muted); }
.cert-list .pursuing { border-color: rgba(62, 198, 255, 0.45); }

.contact-form {
  display: grid;
  gap: 0.85rem;
  max-width: 560px;
}
.contact-form label { display: grid; gap: 0.35rem; color: var(--muted); }
.contact-form input,
.contact-form textarea {
  background: var(--form-bg);
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.7rem 0.8rem;
  font: inherit;
}
.disclaimer {
  margin-top: 1.6rem;
  color: var(--muted);
  font-size: 0.92rem;
  max-width: 68ch;
}

.footer {
  padding: 2rem 6vw 3rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  text-align: center;
}
.fine { font-size: 0.82rem; }

@media (max-width: 820px) {
  .hero, .cards, .split { grid-template-columns: 1fr; }
  .nav-toggle { display: inline-flex; }
  .nav-links {
    display: none;
    position: absolute;
    right: 6vw;
    top: 58px;
    flex-direction: column;
    background: var(--bg-raise);
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 0.8rem 1rem;
  }
  .nav-links.open { display: flex; }
}