/* Push-Up Tabata — the app's palette, at web weight. No frameworks, one file. */

:root {
  --indigo: #090119;
  --indigo-soft: #150a2e;
  --magenta: #ff2ecc;
  --pink: #ff1b8d;
  --turquoise: #29eee0;
  --sun: #ffcc4d;
  --ink: #f4f1ff;
  --ink-dim: #b9aed6;
  --max: 1080px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--indigo);
  color: var(--ink);
  font: 17px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  /* The grid horizon, drawn rather than shipped as an image. */
  background-image:
    radial-gradient(120% 70% at 50% 0%, rgba(255, 27, 141, 0.28), transparent 60%),
    radial-gradient(90% 50% at 50% 8%, rgba(255, 204, 77, 0.16), transparent 70%);
  background-repeat: no-repeat;
}

h1, h2, h3 { line-height: 1.1; letter-spacing: -0.02em; }

h1 {
  font-size: clamp(2.7rem, 8vw, 4.2rem);
  font-style: italic;
  font-weight: 800;
  margin: 0.1em 0 0.3em;
  text-transform: uppercase;
  text-shadow: 0 0 34px rgba(255, 140, 40, 0.55);
}

h2 {
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  font-style: italic;
  font-weight: 800;
  text-transform: uppercase;
  margin: 0 0 0.6em;
}

h3 { font-size: 1.1rem; margin: 0 0 0.35em; color: var(--turquoise); }

a { color: var(--turquoise); }

p { margin: 0 0 1em; }

/* ---------- hero ---------- */

.hero {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(28px, 6vw, 72px) 24px 24px;
  display: grid;
  gap: clamp(16px, 4vw, 48px);
  grid-template-columns: 1fr;
  align-items: center;
}

@media (min-width: 820px) {
  .hero { grid-template-columns: 1.05fr 0.95fr; padding-bottom: 48px; }
}

.eyebrow {
  color: var(--turquoise);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.78rem;
  font-weight: 700;
  margin: 0;
}

.lede { font-size: 1.15rem; color: var(--ink-dim); max-width: 34em; }

.hero-shot {
  width: 100%;
  height: auto;
  max-width: 380px;
  justify-self: center;
  filter: drop-shadow(0 30px 60px rgba(255, 27, 141, 0.35));
}

/* ---------- calls to action ---------- */

.cta {
  display: inline-block;
  background: var(--turquoise);
  color: var(--indigo);
  font-weight: 800;
  font-style: italic;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  text-decoration: none;
  padding: 16px clamp(20px, 5vw, 30px);
  border-radius: 999px;
  box-shadow: 0 0 28px rgba(41, 238, 224, 0.45);
  /* One line at every width: the label breaking after "THE" looked like a bug. */
  white-space: nowrap;
  font-size: clamp(0.95rem, 3.6vw, 1.05rem);
}

.cta:hover { background: #fff; }

.fineprint { color: var(--ink-dim); font-size: 0.92rem; }

/* ---------- sections ---------- */

main { max-width: var(--max); margin: 0 auto; padding: 0 24px 8px; }

section { padding: clamp(32px, 6vw, 64px) 0; border-top: 1px solid rgba(255,255,255,0.08); }

section p { color: var(--ink-dim); max-width: 60ch; }

.features {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 24px;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.features li {
  background: var(--indigo-soft);
  border: 1px solid rgba(255,255,255,0.07);
  border-radius: 16px;
  padding: 22px;
}

.features p { margin: 0; font-size: 0.97rem; }

/* ---------- faq ---------- */

details {
  border-bottom: 1px solid rgba(255,255,255,0.08);
  padding: 14px 0;
}

summary {
  cursor: pointer;
  font-weight: 650;
  font-size: 1.05rem;
  list-style: none;
  padding-right: 28px;
  position: relative;
}

summary::-webkit-details-marker { display: none; }

summary::after {
  content: "+";
  position: absolute;
  right: 4px;
  color: var(--turquoise);
  font-weight: 400;
  font-size: 1.4rem;
  line-height: 1;
}

details[open] summary::after { content: "−"; }

details p { margin: 12px 0 4px; }

/* ---------- closing + footer ---------- */

.closing { text-align: center; }
.closing h2 { text-shadow: 0 0 30px rgba(255, 140, 40, 0.5); }

footer {
  max-width: var(--max);
  margin: 0 auto;
  padding: 40px 24px 64px;
  border-top: 1px solid rgba(255,255,255,0.08);
  color: var(--ink-dim);
  font-size: 0.92rem;
}

footer p { margin: 0 0 6px; }

/* ---------- article pages ---------- */

.page { max-width: 760px; margin: 0 auto; padding: clamp(28px, 6vw, 64px) 24px; }
.page h1 { font-size: clamp(2rem, 6vw, 2.8rem); }
.page h2 { font-size: 1.35rem; margin-top: 2em; }
.page p, .page li { color: var(--ink-dim); }
.page ul { padding-left: 1.2em; }
.page li { margin-bottom: 0.5em; }
.back { display: inline-block; margin-bottom: 8px; font-weight: 600; text-decoration: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}