/* ============================================================
   INVEST 101 — design system
   Style: bold-pastel neo-brutalist — heavy ink borders, hard offset
   shadows, uppercase condensed headings, pastel colour-blocked cards.
   No external fonts, no frameworks, no runtime dependencies.
   ============================================================ */

:root {
  /* ink + surfaces */
  --ink: #111111;
  --bg: #fafaf7;
  --paper: #ffffff;
  --muted: #555555;

  /* pastel card palette (rotate across topic cards) */
  --mint: #c9f4d4;
  --cream: #fbf3c9;
  --pink: #fbd3d8;
  --lavender: #e8d5f5;
  --sky: #cbeff8;
  --peach: #fde4c8;

  /* accent (CTA green from the prototype) */
  --accent: #46e07d;

  /* borders + shadows */
  --line: 2.5px solid var(--ink);
  --shadow: 5px 5px 0 var(--ink);
  --shadow-sm: 3px 3px 0 var(--ink);

  --radius: 12px;
  --maxw: 1080px;

  font-size: 16px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ---------- typography ---------- */

h1, h2, h3, .display {
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: -0.02em;
  line-height: 1.12;
  margin: 0 0 0.5em;
}

h1 { font-size: clamp(2rem, 5.5vw, 3.4rem); }
h2 { font-size: clamp(1.4rem, 3.5vw, 2rem); }
h3 { font-size: 1.15rem; }

p { margin: 0 0 1em; }

a { color: inherit; }

.kicker {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  margin-bottom: 0.6rem;
}

.lede { font-size: 1.08rem; max-width: 62ch; }

/* ---------- layout ---------- */

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 20px;
}

main.wrap { padding-top: 32px; padding-bottom: 64px; }

section + section { margin-top: 48px; }

/* A <section> that follows a content card / callout needs the same breathing
   room as section-to-section — without this the desktop "Sources used for this
   site" box and how-to-start Track I butt straight into the heavy border above.
   Mobile already stacks with the card shadow visible; this just restores the gap
   on wider screens too. */
.content-card + section,
.callout + section { margin-top: 48px; }

/* ---------- header / nav (injected by components.js) ---------- */

.site-header {
  background: var(--paper);
  border-bottom: var(--line);
  position: sticky;
  top: 0;
  z-index: 50;
}

.site-header .bar {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  gap: 16px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 900;
  font-size: 1.15rem;
  text-transform: uppercase;
  letter-spacing: -0.01em;
  text-decoration: none;
}

.logo .mark {
  display: inline-grid;
  place-items: center;
  width: 34px;
  height: 34px;
  background: var(--ink);
  color: var(--accent);
  border-radius: 8px;
  font-size: 1rem;
}

.site-nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 18px;
}

.site-nav a {
  font-size: 0.8rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  text-decoration: none;
  padding: 4px 2px;
}

.site-nav a:hover { text-decoration: underline; text-underline-offset: 4px; }

.site-nav .cta {
  background: var(--accent);
  border: var(--line);
  border-radius: 8px;
  padding: 8px 14px;
  box-shadow: var(--shadow-sm);
}

.site-nav .cta:hover {
  text-decoration: none;
  transform: translate(-1px, -1px);
  box-shadow: 4px 4px 0 var(--ink);
}

/* mobile nav */
.nav-toggle {
  display: none;
  margin-left: auto;
  background: var(--paper);
  border: var(--line);
  border-radius: 8px;
  padding: 6px 10px;
  font-weight: 900;
  font-size: 1rem;
  cursor: pointer;
}

@media (max-width: 760px) {
  .nav-toggle { display: block; }
  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--paper);
    border-bottom: var(--line);
    flex-direction: column;
    align-items: stretch;
    padding: 12px 20px 16px;
    gap: 12px;
  }
  .site-nav.open { display: flex; }
}

/* ---------- ticker strip ---------- */

.ticker {
  background: var(--ink);
  color: #fff;
  overflow: hidden;
  white-space: nowrap;
  border-bottom: var(--line);
}

.ticker .reel {
  display: inline-block;
  padding: 8px 0;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  animation: reel 28s linear infinite;
}

.ticker .reel span { margin: 0 1.4em; }
.ticker .reel .dot { color: var(--accent); }

@keyframes reel {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

@media (prefers-reduced-motion: reduce) {
  .ticker .reel { animation: none; }
}

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

.hero { padding: 56px 0 8px; }

.hero .actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 22px; }

/* ---------- buttons ---------- */

.btn {
  display: inline-block;
  background: var(--ink);
  color: #fff;
  border: var(--line);
  border-radius: 10px;
  box-shadow: var(--shadow-sm);
  padding: 12px 20px;
  font-size: 0.82rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  text-decoration: none;
  cursor: pointer;
}

.btn.green { background: var(--accent); color: var(--ink); }
.btn.ghost { background: var(--paper); color: var(--ink); }

.btn:hover { transform: translate(-2px, -2px); box-shadow: var(--shadow); }
.btn:active { transform: translate(1px, 1px); box-shadow: 2px 2px 0 var(--ink); }

.btn:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
button:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

.back-link {
  display: inline-block;
  margin-right: 16px;
  background: var(--paper);
  border: var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow-sm);
  padding: 6px 14px;
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  margin-bottom: 26px;
}

.back-link:hover { transform: translate(-1px, -1px); box-shadow: 4px 4px 0 var(--ink); }

/* ---------- cards ---------- */

.card {
  background: var(--paper);
  border: var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 22px;
  margin-top: 26px;
}

a.topic-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  border: var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px;
  text-decoration: none;
  transition: transform 80ms ease-out, box-shadow 80ms ease-out;
}

a.topic-card:hover { transform: translate(-3px, -3px); box-shadow: 8px 8px 0 var(--ink); }
a.topic-card:active { transform: translate(1px, 1px); box-shadow: 2px 2px 0 var(--ink); }

.topic-card .num {
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.18em;
}

.topic-card h3 { margin: 0; }

.topic-card p { margin: 0; font-size: 0.9rem; color: var(--ink); }

.topic-card .go { margin-top: auto; font-weight: 900; font-size: 0.85rem; }

/* pastel rotation */
.tint-mint { background: var(--mint); }
.tint-cream { background: var(--cream); }
.tint-pink { background: var(--pink); }
.tint-lavender { background: var(--lavender); }
.tint-sky { background: var(--sky); }
.tint-peach { background: var(--peach); }

/* ---------- content pages ---------- */

.content-card {
  background: var(--paper);
  border: var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: clamp(22px, 4vw, 40px);
}

.content-card.tinted { padding-top: 30px; }

.content-card ul, .content-card ol { padding-left: 1.3em; }
.content-card li { margin-bottom: 0.55em; }
.content-card li::marker { font-weight: 800; }

.term { margin-bottom: 1.1em; }
.term dt { font-weight: 900; text-transform: uppercase; font-size: 0.95rem; }
.term dd { margin: 4px 0 0; }

.callout {
  border: var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: 18px 22px;
  margin: 26px 0;
}

.callout .kicker { margin-bottom: 0.3rem; }
.callout p:last-child { margin-bottom: 0; }

/* data tables */
.table-wrap { overflow-x: auto; margin: 22px 0; }

table.data {
  border-collapse: collapse;
  width: 100%;
  background: var(--paper);
  border: var(--line);
  box-shadow: var(--shadow-sm);
  font-size: 0.95rem;
}

table.data th {
  background: var(--ink);
  color: #fff;
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  padding: 10px 14px;
  text-align: left;
}

table.data td {
  border-top: 2px solid var(--ink);
  border-left: 2px solid var(--ink);
  padding: 10px 14px;
  vertical-align: top;
}

table.data td:first-child { border-left: none; font-weight: 800; }

/* steps */
.step {
  display: flex;
  gap: 16px;
  margin: 18px 0;
}

.step .n {
  flex: 0 0 38px;
  height: 38px;
  display: grid;
  place-items: center;
  background: var(--ink);
  color: #fff;
  font-weight: 900;
  border-radius: 10px;
  border: var(--line);
  box-shadow: var(--shadow-sm);
}

.step .body { flex: 1; }
.step .body h3 { margin-bottom: 0.25em; }

/* ---------- calculators ---------- */

.calc-layout {
  display: grid;
  grid-template-columns: minmax(280px, 380px) 1fr;
  gap: 26px;
  align-items: start;
  margin-top: 26px;
}

@media (max-width: 860px) { .calc-layout { grid-template-columns: 1fr; } }

.calc-form { display: grid; gap: 16px; }

.field label {
  display: block;
  font-size: 0.75rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 6px;
}

.field input, .field select {
  width: 100%;
  border: var(--line);
  border-radius: 8px;
  background: var(--paper);
  padding: 10px 12px;
  font: inherit;
  font-weight: 700;
}

.field .hint { font-size: 0.78rem; color: var(--muted); margin-top: 4px; }

.results { display: grid; gap: 16px; }

.stat-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 16px;
}

.stat {
  border: var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: 14px 16px;
}

.stat .label {
  font-size: 0.68rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.14em;
}

.stat .value { font-size: clamp(1.2rem, 2.6vw, 1.7rem); font-weight: 900; }

.chart-card {
  background: var(--paper);
  border: var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: 18px;
}

.chart-card svg { display: block; width: 100%; height: auto; }

.legend { display: flex; gap: 18px; flex-wrap: wrap; margin-top: 10px; font-size: 0.78rem; font-weight: 700; }
.legend .swatch { display: inline-block; width: 14px; height: 14px; border: 2px solid var(--ink); border-radius: 4px; vertical-align: -2px; margin-right: 6px; }

/* ---------- footer (injected) ---------- */

.site-footer {
  background: var(--ink);
  color: #fff;
  margin-top: 72px;
}

.site-footer .inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 36px 20px;
  display: grid;
  gap: 18px;
}

.site-footer .brand { font-weight: 900; text-transform: uppercase; font-size: 1.05rem; }

.site-footer .disclaimer {
  font-size: 0.8rem;
  line-height: 1.7;
  color: #d6d6d6;
  border: 2px solid #3a3a3a;
  border-radius: 10px;
  padding: 12px 16px;
}

.site-footer nav { display: flex; flex-wrap: wrap; gap: 14px; font-size: 0.78rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; }
.site-footer nav a { color: #fff; text-decoration: none; }
.site-footer nav a:hover { color: var(--accent); }

.site-footer .fine { font-size: 0.72rem; color: #9a9a9a; }

/* ---------- quiz ---------- */

.quiz { display: grid; gap: 22px; }

.quiz-q {
  border: var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: 18px 20px;
  margin: 0;
  background: var(--paper);
}

.quiz-q legend {
  display: block;
  width: 100%;
  font-weight: 800;
  padding: 0;
}

.quiz-qnum {
  display: inline-block;
  background: var(--ink);
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 900;
  letter-spacing: 0.08em;
  border-radius: 6px;
  padding: 2px 8px;
  margin-right: 8px;
  vertical-align: 2px;
}

.quiz-topic {
  display: inline-block;
  text-transform: uppercase;
  font-size: 0.66rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  color: var(--muted);
  margin-right: 8px;
}

.quiz-prompt { font-weight: 800; }

.quiz-scenario {
  font-size: 0.95rem;
  color: var(--ink);
  background: var(--bg);
  border: 2px solid var(--ink);
  border-radius: 8px;
  padding: 10px 14px;
  margin: 12px 0 14px;
}

.quiz-opt {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  border: 2px solid var(--ink);
  border-radius: 8px;
  padding: 10px 12px;
  margin-top: 10px;
  cursor: pointer;
  background: var(--paper);
}

.quiz-opt:hover { background: var(--bg); }
.quiz-opt input { margin-top: 3px; flex: 0 0 auto; accent-color: var(--ink); }
.quiz-opt-text { flex: 1; }

/* after submit */
.quiz-opt.correct { background: var(--mint); border-color: var(--ink); font-weight: 700; }
.quiz-opt.wrong { background: var(--pink); border-color: var(--ink); }
.quiz-opt input:disabled { cursor: default; }
.quiz-q.quiz-blank { border-color: var(--ink); box-shadow: var(--shadow-sm), 0 0 0 2px var(--peach) inset; }

.quiz-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 4px; }

.quiz-result {
  border: var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: 18px 22px;
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

.quiz-result.pass { background: var(--mint); }
.quiz-result.tryagain { background: var(--cream); }
.quiz-result p { margin: 0; }

.quiz-score {
  font-size: 2.4rem;
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.02em;
}

.quiz-score span { font-size: 1rem; font-weight: 800; color: var(--muted); }

/* ---------- video embeds (open in a new tab on click) ---------- */

.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 18px;
  margin: 16px 0 6px;
}

.video-card {
  display: block;
  text-decoration: none;
  border: var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  background: var(--paper);
}

.video-card:hover { transform: translate(-2px, -2px); box-shadow: var(--shadow); }

.video-thumb {
  position: relative;
  aspect-ratio: 16 / 9;
  background: var(--ink);
}

.video-thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }

.video-thumb .play {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
}

.video-thumb .play span {
  width: 54px;
  height: 54px;
  display: grid;
  place-items: center;
  background: var(--accent);
  color: var(--ink);
  border: var(--line);
  border-radius: 50%;
  box-shadow: var(--shadow-sm);
  font-size: 1.2rem;
  padding-left: 4px;
}

.video-cap {
  padding: 10px 14px;
  font-weight: 800;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.video-cap .ext { font-size: 0.72rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.08em; }

/* ---------- interactive chart tooltip (compound comparison) ---------- */

.chart-card { position: relative; }

.chart-tip {
  position: absolute;
  z-index: 5;
  pointer-events: none;
  background: var(--paper);
  border: var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow-sm);
  padding: 8px 10px;
  font-size: 0.78rem;
  font-weight: 700;
  line-height: 1.5;
  white-space: nowrap;
  opacity: 0;
  transition: opacity 80ms ease-out;
}

.chart-tip.show { opacity: 1; }
.chart-tip .yr { font-weight: 900; text-transform: uppercase; letter-spacing: 0.06em; font-size: 0.68rem; }
.chart-tip .row { display: flex; align-items: center; gap: 6px; }
.chart-tip .row .sw { width: 10px; height: 10px; border: 1.5px solid var(--ink); border-radius: 3px; display: inline-block; }
.chart-tip .diff { border-top: 2px solid var(--ink); margin-top: 4px; padding-top: 4px; }