/* ============================================================
   Number Ninja — site chrome
   Paper-and-dojo look, built from the app's own palette:
   ones = green, tens = blue, hundreds = red (Montessori beads)
   ============================================================ */

:root {
  /* streak hues — the page is lit by these, so everything else stays quiet */
  --violet:  #7C4DFF;
  --pink:    #FF4FA3;
  --blue:    #3B8CFF;
  --cyan:    #35D0E8;

  --paper:   #F4F2FF;
  --paper-2: #EAE7FB;
  --card:    #FFFFFF;
  --glass:   rgba(255, 255, 255, .86);
  --edge:    rgba(255, 255, 255, .8);
  --ink:     #1B1436;
  --sub:     #6B6390;
  --line:    rgba(124, 77, 255, .16);
  --pop:     #7C4DFF;
  --pop-ink: #FFFFFF;

  /* Montessori bead colours stay put — they carry meaning in the games */
  --ones:    #3E9B4F;
  --tens:    #2F6FB7;
  --hunds:   #C94040;

  --shadow:    0 10px 30px rgba(60, 30, 120, .10);
  --shadow-lg: 0 24px 60px rgba(60, 30, 120, .18);

  --nn-bg: #F7F3EA;

  /* Baloo 2 is the game's own face — it stays the display voice.
     Karla carries the prose: squarer counters, so it reads as an adult
     explaining the thing rather than more of the thing. */
  --font-display: 'Baloo 2', ui-rounded, 'Trebuchet MS', system-ui, sans-serif;
  --font-body: 'Karla', 'Helvetica Neue', system-ui, sans-serif;
  --font: var(--font-display);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper:   #0C0A18;
    --paper-2: #141026;
    --card:    #191331;
    --glass:   rgba(25, 19, 49, .84);
    --edge:    rgba(255, 255, 255, .10);
    --ink:     #F2EEFF;
    --sub:     #A79FCF;
    --line:    rgba(160, 130, 255, .20);
    --shadow:    0 10px 30px rgba(0, 0, 0, .5);
    --shadow-lg: 0 24px 60px rgba(0, 0, 0, .62);
  }
}
:root[data-theme="dark"] {
  --paper:   #0C0A18;
  --paper-2: #141026;
  --card:    #191331;
  --glass:   rgba(25, 19, 49, .84);
  --edge:    rgba(255, 255, 255, .10);
  --ink:     #F2EEFF;
  --sub:     #A79FCF;
  --line:    rgba(160, 130, 255, .20);
  --shadow:    0 10px 30px rgba(0, 0, 0, .5);
  --shadow-lg: 0 24px 60px rgba(0, 0, 0, .62);
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 3px solid var(--pop); outline-offset: 3px; border-radius: 8px; }

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--paper);
  overflow-x: hidden;
}

/* Streak backdrop: wide diagonal bands of violet, pink, blue and cyan,
   blurred into one another and drifting slowly. Fixed and behind everything,
   so the page scrolls over a stable light source. */
.paper-grain {
  position: fixed; inset: 0; z-index: 0; pointer-events: none; overflow: hidden;
}
.paper-grain::before {
  content: ""; position: absolute; inset: -35%;
  background:
    linear-gradient(114deg, transparent 10%, var(--violet) 27%, transparent 44%),
    linear-gradient(100deg, transparent 32%, var(--pink) 49%, transparent 66%),
    linear-gradient(129deg, transparent 48%, var(--blue) 66%, transparent 83%),
    linear-gradient(93deg,  transparent 70%, var(--cyan) 86%, transparent 99%);
  filter: blur(110px) saturate(120%);
  opacity: .24;
  animation: drift-streaks 30s ease-in-out infinite alternate;
}
/* fine dot grid so the gradients never band */
.paper-grain::after {
  content: ""; position: absolute; inset: 0; opacity: .55;
  background-image: radial-gradient(circle at 1px 1px, var(--line) 1px, transparent 0);
  background-size: 30px 30px;
}
@keyframes drift-streaks {
  0%   { transform: translate3d(-3%, -2%, 0) rotate(-2deg) scale(1.06); }
  100% { transform: translate3d(3%, 2%, 0) rotate(2deg) scale(1.14); }
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .paper-grain::before { opacity: .34; filter: blur(120px) saturate(135%); }
}
:root[data-theme="dark"] .paper-grain::before { opacity: .34; filter: blur(120px) saturate(135%); }

/* everything the reader touches sits above the backdrop */
#site, #play, footer { position: relative; z-index: 1; }

/* ---------- shared bits ---------- */
.wrap { width: 100%; max-width: 1080px; margin: 0 auto; padding: 0 20px; position: relative; z-index: 1; }
a { color: inherit; }
.eyebrow {
  font-family: var(--font-body);
  font-size: 12.5px; font-weight: 800; letter-spacing: 1.6px; text-transform: uppercase;
  color: var(--sub); margin: 0 0 10px;
}
h2.sec { font-family: var(--font-display); font-size: clamp(27px, 4vw, 39px); font-weight: 800; margin: 0 0 12px; line-height: 1.12; text-wrap: balance; }
p.lede { font-size: clamp(16px, 2vw, 18px); color: var(--sub); font-weight: 600; margin: 0; line-height: 1.6; max-width: 62ch; }

.btn {
  display: inline-flex; align-items: center; gap: 10px; justify-content: center;
  font-family: var(--font-display); font-weight: 800; font-size: 18px;
  border: none; border-radius: 18px; padding: 15px 28px; cursor: pointer;
  text-decoration: none; transition: transform .12s ease, box-shadow .12s ease;
}
.btn:active { transform: scale(.96); }
.btn-primary {
  background: linear-gradient(102deg, var(--violet), var(--pink) 58%, var(--blue));
  background-size: 180% 100%; color: #fff;
  box-shadow: 0 10px 26px rgba(124, 77, 255, .40);
  transition: transform .12s ease, box-shadow .18s ease, background-position .5s ease;
}
.btn-primary:hover {
  transform: translateY(-2px); background-position: 100% 0;
  box-shadow: 0 16px 36px rgba(255, 79, 163, .42);
}
.btn-ghost {
  background: var(--glass); color: var(--ink); backdrop-filter: blur(14px);
  box-shadow: inset 0 0 0 1.5px var(--edge), 0 4px 14px rgba(60, 30, 120, .08);
}
.btn-ghost:hover { transform: translateY(-2px); }

/* ---------- top bar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 30;
  backdrop-filter: blur(12px);
  background: color-mix(in srgb, var(--paper) 80%, transparent);
  border-bottom: 1px solid var(--edge);
}
.topbar .wrap { display: flex; align-items: center; gap: 14px; height: 66px; }
.brand { font-family: var(--font-display); display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 19px; text-decoration: none; }
.brand .mark {
  width: 38px; height: 38px; border-radius: 12px; display: grid; place-items: center; font-size: 21px;
  background: var(--glass); border: 1px solid var(--edge); box-shadow: var(--shadow);
}
.topbar .spacer { flex: 1; }
.topbar nav { display: flex; gap: 22px; font-weight: 700; font-size: 15px; color: var(--sub); }
.topbar nav a { text-decoration: none; }
.topbar nav a:hover { color: var(--ink); }
.topbar .btn { padding: 10px 20px; font-size: 15px; border-radius: 14px; }
@media (max-width: 760px) { .topbar nav { display: none; } }

/* ---------- hero ---------- */
.hero { padding: clamp(40px, 7vw, 84px) 0 clamp(30px, 5vw, 60px); }
.hero .wrap { display: grid; grid-template-columns: 1.05fr .95fr; gap: clamp(24px, 5vw, 56px); align-items: center; }
@media (max-width: 900px) { .hero .wrap { grid-template-columns: 1fr; } }

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(37px, 6.6vw, 64px); line-height: 1.03; font-weight: 800; margin: 0 0 18px;
  letter-spacing: -.4px; text-wrap: balance;
}
.hero h1 .swipe {
  background: linear-gradient(100deg, var(--violet), var(--pink) 46%, var(--blue));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero .sub { font-size: clamp(17px, 2.2vw, 20px); color: var(--sub); font-weight: 600; line-height: 1.6; margin: 0 0 28px; max-width: 46ch; }
.hero .cta { display: flex; gap: 12px; flex-wrap: wrap; }
.hero .trust { margin-top: 22px; font-size: 14px; font-weight: 700; color: var(--sub); display: flex; gap: 18px; flex-wrap: wrap; }

/* the manipulatives stack — the actual thing the app teaches with */
.blocks {
  background: var(--glass); border-radius: 30px; padding: 26px 26px 22px;
  box-shadow: var(--shadow-lg); position: relative; overflow: hidden;
  border: 1px solid var(--edge); backdrop-filter: blur(20px) saturate(150%);
}
.blocks::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: radial-gradient(120% 90% at 80% 0%, rgba(124, 77, 255, .16), transparent 60%);
}
.blocks .row { display: flex; align-items: flex-end; gap: 16px; justify-content: center;
  min-height: 104px; flex-wrap: wrap; }
.flat {
  width: 76px; height: 76px; border-radius: 10px; background: var(--hunds);
  box-shadow: inset 0 -7px 0 rgba(0,0,0,.2); display: grid; place-items: center;
  color: #fff; font-weight: 800; font-size: 22px;
  background-image: linear-gradient(var(--line-a, rgba(255,255,255,.16)) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.16) 1px, transparent 1px);
  background-size: 7.6px 7.6px;
  animation: bob 4s ease-in-out infinite;
}
.rods { display: flex; gap: 6px; align-items: flex-end; flex-wrap: wrap; max-width: 210px; justify-content: center; }
.rod {
  width: 14px; height: 68px; border-radius: 5px; background: var(--tens);
  box-shadow: inset 0 -5px 0 rgba(0,0,0,.2);
  background-image: linear-gradient(rgba(255,255,255,.18) 1px, transparent 1px);
  background-size: 100% 6.8px;
  animation: bob 4s ease-in-out infinite;
}
.cubes { display: grid; grid-template-columns: repeat(4, 14px); gap: 5px; justify-content: center; }
.cube {
  width: 14px; height: 14px; border-radius: 4px; background: var(--ones);
  box-shadow: inset 0 -4px 0 rgba(0,0,0,.2);
  animation: bob 4s ease-in-out infinite;
}
@keyframes bob { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-7px); } }
@keyframes pop-in { 0% { transform: scale(0) rotate(-30deg); opacity: 0; } 70% { transform: scale(1.3); } 100% { transform: scale(1); opacity: 1; } }
@keyframes bundle { 0% { transform: scale(1); } 45% { transform: scale(1.35) rotate(6deg); } 100% { transform: scale(1); } }
.cube.fresh { animation: pop-in .32s ease both; }
.rods .rod.fresh { animation: bundle .5s ease both; }

.blocks .demo-bar {
  display: flex; align-items: center; gap: 10px; margin-top: 16px; justify-content: center;
}
.blocks .demo-bar button {
  font-family: var(--font-display); font-weight: 800; font-size: 16px; cursor: pointer;
  border: none; border-radius: 14px; padding: 11px 20px; color: #fff;
  background: linear-gradient(102deg, var(--violet), var(--pink));
  box-shadow: 0 6px 18px rgba(124, 77, 255, .34);
}
.blocks .demo-bar button.ghost {
  background: transparent; color: var(--sub); box-shadow: inset 0 0 0 1.5px var(--line);
}
.blocks .demo-bar button:active { transform: scale(.94); }
.blocks .hint {
  text-align: center; font-family: var(--font-body); font-size: 13px; font-weight: 600;
  color: var(--sub); margin-top: 10px; min-height: 20px;
}
.blocks .caption {
  font-family: var(--font-display); text-align: center; margin-top: 18px; padding-top: 16px;
  border-top: 2px dashed var(--line); font-weight: 800; font-size: clamp(19px, 2.4vw, 23px);
  font-variant-numeric: tabular-nums;
}
.blocks .caption small { display: block; font-size: 13.5px; font-weight: 700; color: var(--sub); margin-top: 6px; letter-spacing: .3px; }
.k-h { color: var(--hunds); } .k-t { color: var(--tens); } .k-o { color: var(--ones); }

/* ---------- sections ---------- */
section { padding: clamp(44px, 7vw, 82px) 0; position: relative; }
section.tint { background: color-mix(in srgb, var(--paper-2) 78%, transparent); }
.sec-head { max-width: 640px; margin-bottom: clamp(26px, 4vw, 44px); }

.grid { display: grid; gap: 18px; }
.g3 { grid-template-columns: repeat(3, 1fr); }
.g2 { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 860px) { .g3 { grid-template-columns: 1fr; } .g2 { grid-template-columns: 1fr; } }

.card {
  background: var(--glass); border-radius: 24px; padding: 26px 24px;
  box-shadow: var(--shadow); border: 1px solid var(--edge);
  backdrop-filter: blur(16px) saturate(140%);
}
.card h3 { font-family: var(--font-display); font-size: 21px; font-weight: 800; margin: 14px 0 8px; }
.card p { font-size: 15px; color: var(--sub); font-weight: 600; line-height: 1.6; margin: 0; }
.card .ico {
  width: 54px; height: 54px; border-radius: 17px; display: grid; place-items: center; font-size: 27px;
  background: linear-gradient(140deg, color-mix(in srgb, var(--violet) 18%, transparent),
                                      color-mix(in srgb, var(--pink) 16%, transparent));
  border: 1px solid var(--edge);
}

/* teaching demos inside the pillar cards */
.demo { margin-top: 16px; padding-top: 16px; border-top: 1px solid var(--line); font-weight: 800; }
.demo .pair { display: flex; gap: 10px; flex-wrap: wrap; }
.chip {
  border-radius: 12px; padding: 8px 12px; font-size: 15px; font-weight: 800;
  background: color-mix(in srgb, var(--paper-2) 70%, transparent);
}
.chip.a { color: var(--tens); box-shadow: inset 0 0 0 2px color-mix(in srgb, var(--tens) 30%, transparent); }
.chip.b { color: var(--hunds); box-shadow: inset 0 0 0 2px color-mix(in srgb, var(--hunds) 30%, transparent); }
.chip.c { color: var(--ones); box-shadow: inset 0 0 0 2px color-mix(in srgb, var(--ones) 30%, transparent); }

/* ---------- game list ---------- */
.games { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 14px; }
.game {
  display: flex; align-items: center; gap: 15px; text-align: left; width: 100%;
  background: var(--glass); border: 1px solid var(--edge); border-radius: 20px; padding: 16px;
  box-shadow: var(--shadow); text-decoration: none; cursor: pointer;
  backdrop-filter: blur(16px) saturate(140%);
  font-family: var(--font-body); transition: transform .14s ease, box-shadow .14s ease;
}
.game:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.game .ico {
  width: 50px; height: 50px; border-radius: 16px; display: grid; place-items: center; font-size: 26px; flex: none;
  background: linear-gradient(140deg, color-mix(in srgb, var(--violet) 18%, transparent),
                                      color-mix(in srgb, var(--blue) 16%, transparent));
  border: 1px solid var(--edge);
}
.game .t { font-family: var(--font-display); font-size: 17px; font-weight: 800; }
.game .s { font-size: 13.5px; font-weight: 600; color: var(--sub); margin-top: 2px; }
.game .go { color: var(--sub); font-size: 22px; }

/* ---------- belts ---------- */
.belts { display: flex; gap: 12px; flex-wrap: wrap; }
.belt {
  flex: 1 1 150px; background: var(--glass); border: 1px solid var(--edge); border-radius: 18px;
  padding: 16px 14px; text-align: center; box-shadow: var(--shadow);
  backdrop-filter: blur(14px) saturate(140%);
}
.belt .bar { height: 10px; border-radius: 6px; margin-bottom: 12px; }
.belt .n { font-family: var(--font-display); font-weight: 800; font-size: 15.5px; }
.belt .s { font-size: 12.5px; font-weight: 700; color: var(--sub); margin-top: 3px; }

/* ---------- grown-ups ---------- */
.facts { display: grid; gap: 14px; }
.fact { display: flex; gap: 13px; align-items: flex-start; }
.fact .tick {
  width: 26px; height: 26px; border-radius: 9px; flex: none; display: grid; place-items: center;
  background: color-mix(in srgb, var(--ones) 16%, transparent); color: var(--ones); font-weight: 800; font-size: 14px;
}
.fact b { font-family: var(--font-display); display: block; font-size: 16px; font-weight: 800; }
.fact span { font-size: 14px; color: var(--sub); font-weight: 600; line-height: 1.55; }

/* ---------- footer ---------- */
footer { border-top: 1px solid var(--line); padding: 34px 0 44px; }
footer .wrap { display: flex; gap: 14px; align-items: center; flex-wrap: wrap; }
footer .note { font-size: 13.5px; color: var(--sub); font-weight: 700; }

/* ============================================================
   PLAY VIEW — the React app lives here
   ============================================================ */
#play { display: none; }
body.playing #play { display: block; }
body.playing #site { display: none; }
body.playing { background: var(--nn-bg); transition: background .3s ease; }
body.playing .paper-grain { display: none; }
@media (min-width: 1000px) { body.playing .paper-grain { display: block; } }

.play-bar {
  position: sticky; top: 0; z-index: 41; height: 52px;
  display: flex; align-items: center; gap: 12px; padding: 0 14px;
  background: color-mix(in srgb, var(--nn-bg) 88%, transparent);
  backdrop-filter: blur(10px);
}
.play-bar .exit {
  font-family: var(--font-display); font-weight: 800; font-size: 14px; cursor: pointer;
  border: none; border-radius: 12px; padding: 9px 15px;
  background: rgba(128, 128, 128, .16); color: var(--nn-ink, var(--ink));
}
.play-bar .exit:active { transform: scale(.95); }
.play-bar .who { font-size: 13px; font-weight: 800; color: var(--nn-sub, var(--sub)); opacity: .8; }

/* the app column: phone-width everywhere, framed once there is room */
.nn-app { width: 100%; max-width: 480px; margin: 0 auto; min-height: calc(100vh - 52px); }
@media (min-width: 1000px) {
  .nn-app {
    max-width: 500px;
    border-radius: 34px;
    box-shadow: var(--shadow-lg), 0 0 0 1px rgba(0,0,0,.05);
    margin: 14px auto 34px;
    min-height: calc(100vh - 120px);
    overflow: hidden;
  }
  body.playing { background: transparent; }
  .play-bar { background: transparent; backdrop-filter: none; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

/* the newest game gets a lit edge in the list */
.game.hot { box-shadow: var(--shadow), 0 0 0 1.5px color-mix(in srgb, var(--pink) 55%, transparent); }
.game .tag {
  font-family: var(--font-body); font-size: 10px; font-weight: 700; letter-spacing: 1px;
  vertical-align: 2px; margin-left: 7px; padding: 2px 7px; border-radius: 999px; color: #fff;
  background: linear-gradient(100deg, var(--violet), var(--pink));
}
.mini-cta {
  display: inline-block; margin-top: 12px; font-family: var(--font-display);
  font-weight: 800; font-size: 14.5px; text-decoration: none;
  color: var(--pink); border-bottom: 2px solid color-mix(in srgb, var(--pink) 40%, transparent);
  padding-bottom: 1px;
}
.mini-cta:hover { color: var(--violet); border-color: var(--violet); }