:root {
  color-scheme: dark;
  --bg: #071016;
  --bg-2: #0c1820;
  --panel: #122330;
  --panel-2: #172c3a;
  --text: #edf7f7;
  --muted: #9eb8bd;
  --line: rgba(255,255,255,.12);
  --accent: #66e0c2;
  --accent-2: #f7c873;
  --danger: #ff7878;
  --good: #87e389;
  --shadow: 0 24px 80px rgba(0,0,0,.35);
  --radius: 22px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background:
    radial-gradient(circle at 18% 8%, rgba(102,224,194,.18), transparent 24rem),
    radial-gradient(circle at 92% 2%, rgba(247,200,115,.14), transparent 22rem),
    linear-gradient(180deg, #071016 0%, #08131b 55%, #050a0f 100%);
  color: var(--text);
  min-height: 100vh;
}

button, input, select, textarea {
  font: inherit;
}

button {
  background: linear-gradient(135deg, var(--accent), #4db5ff);
  border: 0;
  border-radius: 999px;
  color: #031115;
  cursor: pointer;
  font-weight: 800;
  padding: .75rem 1rem;
  transition: transform .15s ease, filter .15s ease;
}

button:hover { transform: translateY(-1px); filter: brightness(1.06); }
button:disabled { cursor: not-allowed; opacity: .5; }

input, select, textarea {
  width: 100%;
  background: #08151d;
  border: 1px solid var(--line);
  border-radius: 14px;
  color: var(--text);
  padding: .7rem .8rem;
}

textarea { min-height: 96px; resize: vertical; }
label { display: grid; gap: .4rem; color: var(--muted); font-size: .92rem; }
code { color: var(--accent-2); }

.hero {
  padding: 4rem 1rem 2rem;
  border-bottom: 1px solid var(--line);
}

.hero__content {
  max-width: 1180px;
  margin: 0 auto;
}

.eyebrow {
  color: var(--accent);
  font-size: .82rem;
  font-weight: 900;
  letter-spacing: .16em;
  margin: 0 0 .5rem;
  text-transform: uppercase;
}

h1, h2, h3 { line-height: 1.05; margin: 0 0 .8rem; }
h1 { font-size: clamp(3rem, 7vw, 6.7rem); letter-spacing: -.07em; }
h2 { font-size: clamp(1.8rem, 3vw, 3rem); }
h3 { color: #ffffff; font-size: 1.25rem; }
p { color: var(--muted); line-height: 1.62; }

.hero__lede {
  font-size: clamp(1.05rem, 2vw, 1.35rem);
  max-width: 760px;
}

.hero__cards, .grid, .button-row, .filters {
  display: grid;
  gap: 1rem;
}

.hero__cards {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 1.7rem;
}

.metric {
  background: rgba(255,255,255,.06);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem;
}

.metric span { color: var(--muted); display: block; font-size: .85rem; }
.metric strong { display: block; font-size: 1.45rem; margin-top: .25rem; }

.tabs {
  backdrop-filter: blur(18px);
  background: rgba(7,16,22,.82);
  border-bottom: 1px solid var(--line);
  display: flex;
  gap: .5rem;
  overflow-x: auto;
  padding: .75rem max(1rem, calc((100vw - 1180px) / 2));
  position: sticky;
  top: 0;
  z-index: 5;
}

.tab {
  background: transparent;
  border: 1px solid var(--line);
  color: var(--muted);
  white-space: nowrap;
}

.tab.is-active {
  background: var(--accent);
  color: #041115;
}

main {
  max-width: 1180px;
  margin: 0 auto;
  padding: 2rem 1rem 4rem;
}

.panel { display: none; }
.panel.is-active { display: block; }

.grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid.three { grid-template-columns: repeat(3, minmax(0, 1fr)); margin-top: 1rem; }

.card {
  background: linear-gradient(180deg, rgba(23,44,58,.96), rgba(13,26,36,.96));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.25rem;
}

.card.danger { border-color: rgba(255,120,120,.35); }

.section-head {
  align-items: end;
  display: flex;
  gap: 1rem;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.compact-list { color: var(--muted); line-height: 1.65; padding-left: 1.25rem; }
.muted { color: var(--muted); font-size: .92rem; }

.timer__display {
  color: var(--accent-2);
  font-size: clamp(2.6rem, 6vw, 4.5rem);
  font-weight: 950;
  letter-spacing: -.05em;
  text-align: center;
}

.button-row { grid-template-columns: repeat(2, minmax(0, 1fr)); }

.timeline {
  display: grid;
  gap: .75rem;
}

.timeline div {
  align-items: start;
  background: rgba(255,255,255,.045);
  border: 1px solid var(--line);
  border-radius: 16px;
  display: grid;
  gap: .8rem;
  grid-template-columns: 9rem 1fr;
  padding: .85rem;
}

.timeline strong { color: var(--accent-2); }
.timeline span { color: var(--muted); }

.day-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 1rem;
}

.day-card h3 { display: flex; justify-content: space-between; gap: 1rem; }
.day-card .badge {
  background: rgba(102,224,194,.15);
  border: 1px solid rgba(102,224,194,.35);
  border-radius: 999px;
  color: var(--accent);
  font-size: .76rem;
  padding: .25rem .55rem;
}

.day-card ul { color: var(--muted); line-height: 1.55; padding-left: 1.15rem; }

.filters { align-items: end; grid-template-columns: 12rem 6rem auto; }

.quiz-question {
  border-bottom: 1px solid var(--line);
  padding: 1rem 0;
}

.quiz-question:first-child { padding-top: 0; }
.quiz-question:last-child { border-bottom: 0; }

.option {
  background: rgba(255,255,255,.045);
  border: 1px solid var(--line);
  border-radius: 14px;
  cursor: pointer;
  margin: .45rem 0;
  padding: .7rem;
}

.option.correct { border-color: var(--good); background: rgba(135,227,137,.13); }
.option.wrong { border-color: var(--danger); background: rgba(255,120,120,.13); }
.explanation { display: none; color: var(--muted); margin-top: .65rem; }
.explanation.is-visible { display: block; }

.wide {
  display: block;
  margin-bottom: .75rem;
  width: 100%;
}

.lab-card { display: grid; gap: .8rem; }
.result {
  background: #07131a;
  border: 1px solid var(--line);
  border-radius: 16px;
  color: var(--text);
  line-height: 1.6;
  min-height: 80px;
  padding: .9rem;
}

.form-card { display: grid; gap: .8rem; }
.danger-button { background: linear-gradient(135deg, #ff8e8e, #f7c873); }

.miss-entry {
  background: rgba(255,255,255,.045);
  border: 1px solid var(--line);
  border-radius: 16px;
  margin-bottom: .75rem;
  padding: .85rem;
}

.miss-entry strong { color: var(--accent-2); }

footer {
  border-top: 1px solid var(--line);
  padding: 1.5rem 1rem 3rem;
  text-align: center;
}

@media (max-width: 860px) {
  .hero__cards, .grid.two, .grid.three, .day-grid, .filters { grid-template-columns: 1fr; }
  .section-head { align-items: stretch; flex-direction: column; }
  .timeline div { grid-template-columns: 1fr; }
}