/* ==========================================================================
   Statistiska lurigheter – theme
   Clean, child-friendly, colorful. Works on mobile and desktop.
   ========================================================================== */

:root {
  /* Playful palette (also referenced by name from the JSON graphs) */
  --c-blue:   #4d8bf0;
  --c-red:    #ff5c72;
  --c-green:  #33c481;
  --c-orange: #ff9f43;
  --c-purple: #a66cff;
  --c-pink:   #ff6bcb;
  --c-yellow: #ffd23f;
  --c-teal:   #22c1c3;

  --ink:      #2b2b3a;
  --ink-soft: #5c5c72;
  --paper:    #ffffff;
  --line:     #e9e9f2;

  --radius:   22px;
  --radius-s: 14px;
  --shadow:   0 10px 30px rgba(60, 50, 120, 0.12);
  --shadow-s: 0 4px 14px rgba(60, 50, 120, 0.12);

  --maxw: 720px;
  --stage-px: clamp(18px, 5vw, 32px);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
}

body {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  font-family: "Fredoka", system-ui, -apple-system, "Segoe UI", sans-serif;
  color: var(--ink);
  background-color: #fbfbff;
  background-image:
    radial-gradient(rgba(96, 82, 170, 0.06) 1.4px, transparent 1.5px),
    radial-gradient(1200px 600px at 10% -10%, #fde7ff 0%, transparent 55%),
    radial-gradient(1000px 600px at 110% 10%, #e2f0ff 0%, transparent 55%),
    radial-gradient(900px 700px at 50% 120%, #e6fff4 0%, transparent 55%);
  background-size: 24px 24px, auto, auto, auto;
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
}

/* ------------------------------------------------------------------ Topbar */

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px clamp(14px, 4vw, 26px);
  background: rgba(255, 255, 255, 0.75);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.topbar[hidden] { display: none; }

.topbar__info {
  flex: 1;
  min-width: 0;
}

.topbar__topic {
  display: block;
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--ink-soft);
  margin-bottom: 6px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.topbar__back,
.topbar__home {
  flex: 0 0 auto;
  width: 40px;
  height: 40px;
  border: none;
  border-radius: 50%;
  background: #fff;
  box-shadow: var(--shadow-s);
  color: var(--ink);
  font-size: 1.2rem;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease;
}

.topbar__back:hover,
.topbar__home:hover { transform: scale(1.08); background: #f4f2ff; }
.topbar__back:active,
.topbar__home:active { transform: scale(0.94); }
.topbar__back[hidden] { visibility: hidden; }

.progress {
  height: 10px;
  border-radius: 999px;
  background: #ececf6;
  overflow: hidden;
}

.progress__bar {
  height: 100%;
  width: 0;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--c-pink), var(--c-orange), var(--c-yellow), var(--c-green), var(--c-blue), var(--c-purple));
  background-size: 300% 100%;
  transition: width 0.45s cubic-bezier(0.22, 1, 0.36, 1);
}

/* ------------------------------------------------------------------- Stage */

.stage {
  flex: 1;
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(24px, 5vw, 52px) var(--stage-px) 44px;
  display: flex;
  flex-direction: column;
  gap: clamp(18px, 3.2vw, 30px);
}

/* A single line inside a part */
.line {
  opacity: 0;
  transform: translateY(14px);
  animation: line-in 0.5s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

@keyframes line-in {
  to { opacity: 1; transform: translateY(0); }
}

.line--text {
  font-size: clamp(1.35rem, 5vw, 2rem);
  line-height: 1.45;
  font-weight: 500;
}

.topic-title {
  margin: 4px 0 8px;
  text-align: center;
  font-size: clamp(1.9rem, 7.5vw, 2.7rem);
  font-weight: 700;
  line-height: 1.1;
  background: linear-gradient(120deg, var(--c-pink), var(--c-purple), var(--c-blue));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;

  /* Slower intro for the title specifically */
  animation: title-in 1.2s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

@keyframes title-in {
  0% { opacity: 0; transform: translateY(20px); }
  100% { opacity: 1; transform: translateY(0); }
}

.hl {
  font-weight: 700;
  padding: 0 2px;
  border-radius: 6px;
  background: var(--hl-bg, #fff0a6);
  color: var(--hl-fg, #7a5c00);
}

/* --------------------------------------------------------------- Graph card */

.graph-card {
  background: var(--paper);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: clamp(14px, 3vw, 22px);
}

.graph-card svg { display: block; width: 100%; height: auto; }
.graph text { font-family: "Fredoka", system-ui, sans-serif; }

.graph-legend {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 7px 16px;
  margin-top: 12px;
  font-size: clamp(0.9rem, 2.6vw, 1rem);
  font-weight: 500;
  color: var(--ink-soft);
}

.graph-legend__item {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.graph-legend__swatch { flex: 0 0 auto; }
.graph-legend__swatch--dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--sw);
}
.graph-legend__swatch--line {
  width: 22px;
  border-top: 4px solid var(--sw);
  border-radius: 2px;
}
.graph-legend__swatch--dashed {
  width: 22px;
  border-top: 4px dashed var(--sw);
}

.graph circle { transform-box: fill-box; transform-origin: center; }
.graph .pt { animation: pop 0.4s cubic-bezier(0.34, 1.56, 0.64, 1) backwards; }
.graph .ln { animation: fade 0.6s ease backwards; }
.graph rect.br {
  transform-box: fill-box;
  transform-origin: bottom;
  animation: grow 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) backwards;
}

@keyframes pop  { from { transform: scale(0); opacity: 0; } }
@keyframes fade { from { opacity: 0; } }
@keyframes grow { from { transform: scaleY(0); opacity: 0; } }

/* ----------------------------------------------------------------- Options */

.options {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.option {
  flex: 1 1 auto;
  min-width: 120px;
  padding: 16px 18px;
  border: 3px solid var(--line);
  border-radius: var(--radius-s);
  background: #fff;
  color: var(--ink);
  font-family: inherit;
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}

.option:hover  { transform: translateY(-3px); border-color: var(--c-purple); }
.option:active { transform: translateY(0) scale(0.98); }

.options.answered .option { cursor: default; }
.options.answered .option:hover { transform: none; }
.option.is-chosen        { border-color: var(--c-purple); background: #f5efff; }
.option.is-correct       { border-color: var(--c-green); background: #eafff5; }
.option.is-wrong         { border-color: var(--c-red);   background: #fff0f2; }
.option[disabled]        { opacity: 0.55; }

/* -------------------------------------------------------------- Next button */

.next-wrap {
  margin-top: 6px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn {
  font-family: inherit;
  font-weight: 700;
  border: none;
  cursor: pointer;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
  transition: transform 0.15s ease, box-shadow 0.15s ease, filter 0.15s ease, opacity 0.15s ease;
}

.btn:active { transform: scale(0.96); }

.btn--next {
  margin-left: auto;
  width: 60px;
  height: 60px;
  font-size: 1.7rem;
  color: #fff;
  background: linear-gradient(135deg, var(--c-purple), var(--c-blue));
  box-shadow: 0 8px 20px rgba(120, 90, 240, 0.35);
  animation: next-bounce 0.6s cubic-bezier(0.34, 1.56, 0.64, 1) both;
}

.btn--next:hover { transform: translateY(-2px); filter: brightness(1.05); }

/* Weaker, secondary "previous" button. */
.btn--prev {
  width: 46px;
  height: 46px;
  font-size: 1.3rem;
  color: var(--ink-soft);
  background: #fff;
  box-shadow: var(--shadow-s);
  opacity: 0.75;
}

.btn--prev:hover { opacity: 1; transform: translateY(-2px); }
.btn--prev[hidden] { display: none; }

@keyframes next-bounce {
  0%   { transform: scale(0.6) translateY(10px); opacity: 0; }
  60%  { transform: scale(1.08) translateY(0); opacity: 1; }
  80%  { transform: scale(0.96); }
  100% { transform: scale(1); }
}

/* --------------------------------------------------------- Intro / Outro */

.hero {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 18px;
  padding: 30px 0;
  opacity: 0;
  transform: translateY(16px);
  animation: line-in 0.6s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

.hero__emoji { font-size: clamp(3.4rem, 16vw, 5.5rem); line-height: 1; }

.hero__title {
  margin: 0;
  font-size: clamp(2.1rem, 9vw, 3.4rem);
  font-weight: 700;
  line-height: 1.05;
  background: linear-gradient(120deg, var(--c-pink), var(--c-purple), var(--c-blue));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero__subtitle {
  margin: 0;
  max-width: 42ch;
  font-size: clamp(1.15rem, 4.6vw, 1.45rem);
  font-weight: 500;
  color: var(--ink-soft);
}

.hero__desc {
  margin: 0;
  max-width: 38ch;
  font-size: clamp(0.98rem, 3.4vw, 1.1rem);
  font-weight: 400;
  color: var(--ink-soft);
  opacity: 0.85;
}

.btn--start {
  margin-top: 10px;
  padding: 18px 46px;
  font-size: 1.35rem;
  color: #fff;
  background: linear-gradient(135deg, var(--c-orange), var(--c-pink));
  box-shadow: 0 12px 28px rgba(255, 110, 150, 0.4);
}

.btn--start:hover { transform: translateY(-3px) rotate(-1deg); }

.links {
  list-style: none;
  padding: 0;
  margin: 6px 0 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 100%;
  max-width: 360px;
}

.links a {
  display: block;
  padding: 15px 20px;
  border-radius: var(--radius-s);
  background: #fff;
  box-shadow: var(--shadow-s);
  color: var(--ink);
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.15s ease;
}

.links a:hover { transform: translateY(-2px); }
.links a::after { content: " →"; color: var(--c-purple); }

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

.footer {
  flex: 0 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 18px;
  font-size: clamp(0.9rem, 1.4vw, 1.02rem);
  color: var(--ink-soft);
  background: rgba(255, 255, 255, 0.6);
  border-top: 1px solid var(--line);
}

.footer__sep { color: var(--line); }

.footer a { color: var(--c-blue); font-weight: 600; text-decoration: none; }
.footer a:hover { text-decoration: underline; }

/* ------------------------------------------------- Mobile: nav at bottom */

@media (max-width: 640px) {
  /* Push the prev/next bar to the bottom of the page, above the footer.
     margin-top:auto handles short pages; sticky handles long/scrolling ones. */
  .next-wrap {
    margin-top: auto;
    position: sticky;
    bottom: 0;
    margin-left: calc(-1 * var(--stage-px));
    margin-right: calc(-1 * var(--stage-px));
    padding: 12px var(--stage-px) calc(12px + env(safe-area-inset-bottom, 0px));
    background: linear-gradient(to top, #fbfbff 62%, rgba(251, 251, 255, 0));
  }
}

/* --------------------------------------------------------- Reduced motion */

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.001ms !important; animation-delay: 0ms !important; }
}