/*
  LearnScrumble website — shared styles for every page.
  Matches the app: black background, white text, translucent cards with a thin border,
  the app icon's blue for links, the app's green for "good" highlights.
*/

:root {
  --bg: #000;
  --surface: rgba(255, 255, 255, 0.08);      /* same as the app's cards */
  --border: rgba(255, 255, 255, 0.2);
  --text: #fff;
  --text-muted: rgba(255, 255, 255, 0.7);
  --text-faint: rgba(255, 255, 255, 0.5);
  --accent: #3d97e0;                          /* the blue in the app icon */
  --good: #34c759;                            /* the app's "Correct!" green */
  --warn: #ff9f0a;                            /* the app's orange notes */
  --radius: 14px;
  --radius-lg: 20px;
  --max: 960px;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.55;
}

img { max-width: 100%; height: auto; display: block; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible, button:focus-visible, summary:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
  border-radius: 6px;
}

/* Skip link for keyboard and screen-reader users */
.skip-link {
  position: absolute;
  left: -999px;
  top: 8px;
  background: var(--text);
  color: var(--bg);
  padding: 8px 14px;
  border-radius: 8px;
  z-index: 10;
}
.skip-link:focus { left: 8px; }

.container { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 20px; }

/* ---------- Header and navigation ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 5;
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 64px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 700;
  font-size: 19px;
}
.brand:hover { text-decoration: none; }
.brand img { width: 36px; height: 36px; border-radius: 9px; }

.nav-toggle {
  display: none;
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 8px 14px;
  font: inherit;
  font-size: 15px;
  cursor: pointer;
}

.site-nav ul {
  list-style: none;
  display: flex;
  gap: 4px;
  margin: 0;
  padding: 0;
}

.site-nav a {
  display: block;
  color: var(--text-muted);
  padding: 8px 12px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
}
.site-nav a:hover { color: var(--text); background: var(--surface); text-decoration: none; }
.site-nav a[aria-current="page"] { color: var(--text); background: var(--surface); }

/* Phone width: the menu drops down OVER the page, so nothing below it moves */
@media (max-width: 720px) {
  .nav-toggle { display: inline-block; }
  .site-header .container { position: relative; }
  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    padding: 8px 20px 16px;
    background: var(--bg);                 /* solid, so the page text doesn't show through */
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.6);
    max-height: calc(100dvh - 64px);    /* long menu scrolls inside itself */
    overflow-y: auto;
  }
  .site-nav.open { display: block; }
  .site-nav ul { flex-direction: column; }
}

/* ---------- Page content ---------- */

main { padding: 40px 0 64px; }

h1 { font-size: clamp(30px, 6vw, 44px); line-height: 1.15; margin: 0 0 12px; }
h2 { font-size: 26px; line-height: 1.25; margin: 48px 0 12px; }
h3 { font-size: 20px; margin: 28px 0 8px; }
p, ul, ol { margin: 0 0 14px; }
li { margin-bottom: 6px; }

.lead { font-size: 20px; color: var(--text-muted); max-width: 640px; }
.muted { color: var(--text-muted); }
.small { font-size: 15px; }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 22px;
}

.card > :first-child { margin-top: 0; }           /* no extra space above a card's heading */
.card > :last-child { margin-bottom: 0; }

.grid { display: grid; gap: 16px; }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 24px;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}
.button:hover { background: rgba(255, 255, 255, 0.14); text-decoration: none; }
.button.primary { background: var(--accent); border-color: var(--accent); }
.button.primary:hover { filter: brightness(1.1); }

/* Home hero */
.hero { display: grid; gap: 32px; align-items: center; grid-template-columns: 1.2fr 1fr; }
.hero .app-icon { width: 88px; height: 88px; border-radius: 20px; margin-bottom: 20px; }
.hero .actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 24px; }
.hero .phone { max-width: 300px; justify-self: center; }
@media (max-width: 720px) { .hero { grid-template-columns: 1fr; } }

.feature h3 { margin-top: 4px; }
.feature .icon { font-size: 28px; }

/* Phone screenshots */
.phone {
  border-radius: 36px;
  border: 1px solid var(--border);
  overflow: hidden;
  background: #000;
  box-shadow: 0 20px 60px rgba(61, 151, 224, 0.15);
}

/* How to play steps */
.steps { list-style: none; padding: 0; margin: 0; counter-reset: step; }
.step {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 28px;
  align-items: center;
  padding: 28px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}
.step:last-child { border-bottom: 0; }
.step .shots { display: flex; gap: 12px; }
.step .shots .phone { border-radius: 26px; max-width: 240px; }
.step.two-shots { grid-template-columns: 1fr; }
.step.two-shots .shots .phone { max-width: 220px; }
.step h2 { margin-top: 0; font-size: 22px; }
.step h2::before {
  counter-increment: step;
  content: counter(step);
  display: inline-grid;
  place-items: center;
  width: 32px;
  height: 32px;
  margin-right: 10px;
  border-radius: 50%;
  background: var(--accent);
  font-size: 16px;
  vertical-align: 2px;
}
.step > * { min-width: 0; }                       /* never let a screenshot push the text wider than the screen */
@media (max-width: 720px) {
  .step { grid-template-columns: 1fr; }
  .step .shots { justify-content: center; }
  .step .shots .phone,
  .step.two-shots .shots .phone { flex: 1 1 0; min-width: 0; max-width: calc(50% - 6px); }   /* two side by side, each half the width */
  .step:not(.two-shots) .shots .phone { max-width: 70%; }
}

/* Tooltip-style quote of the app's own instruction */
.tip {
  display: inline-block;
  background: #fff;
  color: #000;
  font-weight: 600;
  font-size: 15px;
  border-radius: 12px;
  padding: 8px 12px;
  margin: 4px 0 10px;
}

/* Notes */
.note {
  border-left: 4px solid var(--accent);
  background: rgba(61, 151, 224, 0.1);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 14px 18px;
  margin: 18px 0;
}
.note.warn { border-left-color: var(--warn); background: rgba(255, 159, 10, 0.1); }
.note.good { border-left-color: var(--good); background: rgba(52, 199, 89, 0.1); }

/* FAQ (native <details>, works without JavaScript) */
.faq details {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 10px;
}
.faq summary {
  cursor: pointer;
  list-style: none;
  padding: 16px 48px 16px 18px;
  font-weight: 600;
  position: relative;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  position: absolute;
  right: 18px;
  top: 12px;
  font-size: 24px;
  color: var(--text-muted);
}
.faq details[open] summary::after { content: "–"; }
.faq .answer { padding: 0 18px 16px; color: var(--text-muted); }

/* Legal pages */
.legal { max-width: 760px; }
.legal h2 { font-size: 22px; margin-top: 40px; }
.legal table { width: 100%; border-collapse: collapse; margin: 12px 0 20px; font-size: 15px; }
.legal th, .legal td {
  text-align: left;
  vertical-align: top;
  padding: 10px 12px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}
.legal th { color: var(--text-muted); font-weight: 600; }
.table-wrap { overflow-x: auto; }
.toc { columns: 2; column-gap: 32px; padding-left: 20px; }
@media (max-width: 720px) { .toc { columns: 1; } }

/* Text you still have to fill in before publishing — highlighted so it can't be missed */
.fill {
  background: rgba(255, 214, 10, 0.25);
  outline: 1px dashed rgba(255, 214, 10, 0.8);
  border-radius: 4px;
  padding: 0 4px;
}

/* Contact block */
.contact { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; }
.contact .email { font-size: 20px; font-weight: 700; }
.copy-status { color: var(--good); font-size: 15px; min-height: 1em; }

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 28px 0 40px;
  color: var(--text-faint);
  font-size: 15px;
}
.site-footer .container { display: flex; flex-wrap: wrap; gap: 12px 24px; justify-content: space-between; }
.site-footer ul { list-style: none; display: flex; flex-wrap: wrap; gap: 8px 20px; margin: 0; padding: 0; }
.site-footer a { color: var(--text-muted); }

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}