:root {
  --ink: #111827;
  --purple: #7c3aed;
  --green: #0f766e;
  --muted: #64748b;
  --line: #dde4ef;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: Inter, "Segoe UI", Arial, sans-serif;
  background:
    radial-gradient(ellipse 34rem 25rem at var(--cursor-x, 18%) var(--cursor-y, 18%), rgba(124, 58, 237, 0.2), transparent 72%),
    radial-gradient(ellipse 26rem 22rem at 84% 16%, rgba(15, 118, 110, 0.16), transparent 72%),
    linear-gradient(135deg, #faf5ff, #f8fafc 48%, #ecfeff);
  color: var(--ink);
  overflow-x: hidden;
  position: relative;
}

body::before {
  animation: studyGrid 12s ease-in-out infinite alternate;
  background-image:
    linear-gradient(rgba(124, 58, 237, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(124, 58, 237, 0.045) 1px, transparent 1px),
    radial-gradient(circle, rgba(15, 118, 110, 0.13) 0 3px, transparent 4px);
  background-size: 56px 56px, 56px 56px, 92px 92px;
  content: "";
  inset: 0;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 34%, black 12%, transparent 86%);
  pointer-events: none;
  position: fixed;
  z-index: 0;
}

.shell {
  width: min(1050px, calc(100% - 32px));
  margin: 0 auto;
  padding: 42px 0;
  position: relative;
  z-index: 1;
}

.hero {
  padding-bottom: 26px;
}

.eyebrow {
  color: var(--purple);
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

h1 {
  font-size: clamp(2.4rem, 7vw, 5.4rem);
  line-height: 0.95;
  margin: 0 0 16px;
}

p { color: var(--muted); }

.dashboard,
form,
.course {
  background: rgba(255, 255, 255, 0.76);
  border: 1px solid var(--line);
  border-radius: 8px;
  backdrop-filter: blur(16px);
  box-shadow: 0 16px 36px rgba(17, 24, 39, 0.08);
}

@keyframes studyGrid {
  from { transform: translateY(0) scale(1); }
  to { transform: translateY(-12px) scale(1.025); }
}

.dashboard {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(3, 1fr);
  margin-bottom: 16px;
  padding: 16px;
}

.dashboard span {
  color: var(--muted);
  display: block;
  font-weight: 800;
}

.dashboard strong {
  font-size: 2rem;
}

form {
  display: grid;
  gap: 12px;
  grid-template-columns: 1fr 120px 120px auto;
  padding: 16px;
}

input,
select,
button {
  border: 1px solid var(--line);
  border-radius: 8px;
  font: inherit;
  padding: 13px;
}

button {
  background: var(--green);
  border: 0;
  color: white;
  cursor: pointer;
  font-weight: 900;
}

.courses {
  display: grid;
  gap: 12px;
  margin-top: 18px;
}

.course {
  align-items: center;
  display: grid;
  grid-template-columns: 1fr auto auto auto;
  gap: 12px;
  padding: 16px;
}

.course button {
  background: #1f2937;
}

@media (max-width: 760px) {
  .dashboard,
  form,
  .course {
    grid-template-columns: 1fr;
  }
}