/*
 * Base styles: colour tokens, typography, page layout and the top bar.
 * Design direction: "strawberry milk & matcha" — cream paper with polka dots,
 * pastel stickers with chunky 3D shadows, and a squishy rice-cake bunny.
 */

:root {
  --bg: #fff8f1;
  --bg-dot: #f7e3d6;
  --card: #ffffff;
  --ink: #4f3b3b;
  --ink-soft: #8b7272;
  --ink-faint: #bba8a2;
  --line: #f1e0d4;
  --shadow: #ead5c6;

  --pink: #ff9db6;
  --pink-deep: #f0668c;
  --pink-soft: #ffe6ee;
  --pink-shadow: #cf4e74;
  --mint: #93dcbb;
  --mint-deep: #34ad83;
  --mint-soft: #dff6eb;
  --mint-shadow: #248a67;
  --butter: #ffdb85;
  --butter-deep: #f1b43a;
  --butter-soft: #fff5d6;
  --butter-shadow: #cf961e;
  --sky: #a6d3ff;
  --sky-deep: #4f9de6;
  --sky-soft: #e5f2ff;
  --sky-shadow: #3a82c7;
  --lilac: #cfbcf2;
  --lilac-deep: #9776d6;
  --lilac-soft: #f2ecfd;
  --lilac-shadow: #7b5bbd;

  /* Balloon Pop's sky */
  --sky-top: #dcefff;
  --sky-bottom: #fff6ec;
  --cloud: #ffffff;

  /* Surfaces and inks that change with the theme */
  --card-soft: #fdf8f4;
  --glass: rgba(255, 255, 255, 0.8);
  --topbar-bg: rgba(255, 248, 241, 0.88);
  --overlay-bg: rgba(255, 248, 241, 0.86);
  --good-ink: #1f7a5a;
  --almost-ink: #9a6a0c;
  --bad-ink: #c23b55;
  --bad-line: #ffc6d1;

  --good: #34ad83;
  --good-soft: #e2f7ed;
  --bad: #ee5f79;
  --bad-soft: #ffe8ed;
  --almost: #efae2c;
  --almost-soft: #fff5d6;

  --radius-s: 12px;
  --radius: 18px;
  --radius-l: 26px;

  /* Cute rounded font for the interface; clear standard Korean fonts for the words you learn. */
  --font-display: 'Jua', 'Nunito', 'Apple SD Gothic Neo', 'Malgun Gothic', 'Noto Sans KR', 'Noto Sans CJK KR', 'NanumGothic', sans-serif;
  --font-body: 'Nunito', 'Apple SD Gothic Neo', 'Malgun Gothic', 'Noto Sans KR', 'Noto Sans CJK KR', 'Nanum Gothic', 'NanumGothic', system-ui, sans-serif;
  --font-ko: 'Apple SD Gothic Neo', 'Malgun Gothic', 'Noto Sans KR', 'Noto Sans CJK KR', 'Nanum Gothic', 'NanumGothic', sans-serif;
  --font-emoji: 'Apple Color Emoji', 'Segoe UI Emoji', 'Noto Color Emoji', 'Twemoji Mozilla', 'EmojiOne Color', sans-serif;

  color-scheme: light;
}

/*
 * Dark theme ("strawberry milk at night"): the same pastel accents on a cosy
 * cocoa background. Chosen in Settings (Light / Dark / Like my computer).
 */
:root[data-theme='dark'] {
  --bg: #1f1a1e;
  --bg-dot: #2c252a;
  --card: #2b2328;
  --card-soft: #251f23;
  --ink: #f4e9e6;
  --ink-soft: #cbb8b4;
  --ink-faint: #8d7a76;
  --line: #45393f;
  --shadow: #141013;

  --pink: #ef8fab;
  --pink-deep: #ff7ea5;
  --pink-soft: #3b2731;
  --pink-shadow: #b0466c;
  --mint: #74c9a4;
  --mint-deep: #4fcf9f;
  --mint-soft: #1f3530;
  --mint-shadow: #217558;
  --butter: #e9c56d;
  --butter-deep: #f1b43a;
  --butter-soft: #3a3223;
  --butter-shadow: #a2741a;
  --sky: #86b9ea;
  --sky-deep: #72b4f2;
  --sky-soft: #1f2d3e;
  --sky-shadow: #2f68a1;
  --lilac: #baa5e9;
  --lilac-deep: #b597f0;
  --lilac-soft: #2d2640;
  --lilac-shadow: #6a50ae;

  --good: #4fcf9f;
  --good-soft: #1f3a31;
  --bad: #ff7d94;
  --bad-soft: #43242c;
  --almost: #f3be4c;
  --almost-soft: #3c3321;

  --sky-top: #22344b;
  --sky-bottom: #2e2533;
  --cloud: rgba(255, 255, 255, 0.13);

  --glass: rgba(255, 255, 255, 0.07);
  --topbar-bg: rgba(31, 26, 30, 0.9);
  --overlay-bg: rgba(31, 26, 30, 0.86);
  --good-ink: #8fe6c2;
  --almost-ink: #f6d27c;
  --bad-ink: #ffa6b7;
  --bad-line: #6e3542;

  color-scheme: dark;
}

/* The dark theme's accents are brighter, so text on them is dark instead of white. */
:root[data-theme='dark'] .btn-primary,
:root[data-theme='dark'] .btn-mint,
:root[data-theme='dark'] .btn-danger {
  --btn-fg: #2b1f24;
}

:root[data-theme='dark'] .feedback-icon,
:root[data-theme='dark'] .topic-check,
:root[data-theme='dark'] .day.done .day-dot {
  color: #2b1f24;
}

:root[data-theme='dark'] .play-combo {
  color: var(--pink-deep);
}

/* ---------- Reset ---------- */

*,
*::before,
*::after {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.5;
  color: var(--ink);
  background-color: var(--bg);
  background-image: radial-gradient(var(--bg-dot) 1.6px, transparent 1.7px);
  background-size: 24px 24px;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3 {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1.2;
  margin: 0 0 0.4em;
}

h1 {
  font-size: 2rem;
}

h2 {
  font-size: 1.4rem;
}

h3 {
  font-size: 1.15rem;
}

p {
  margin: 0 0 0.8em;
}

a {
  color: var(--pink-deep);
}

button,
input,
select {
  font: inherit;
  color: inherit;
}

button {
  -webkit-tap-highlight-color: transparent;
}

:focus-visible {
  outline: 3px solid var(--sky-deep);
  outline-offset: 3px;
  border-radius: 10px;
}

#view:focus {
  outline: none;
}

[hidden] {
  display: none !important;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.muted {
  color: var(--ink-soft);
}

.noscript {
  max-width: 480px;
  margin: 60px auto;
  padding: 20px;
  text-align: center;
  background: var(--card);
  border-radius: 20px;
}

/* ---------- Bilingual labels: Korean + small English subtitle ---------- */

.bi {
  display: inline-flex;
  flex-direction: column;
  line-height: 1.15;
}

.bi .ko {
  font-family: var(--font-display);
  font-weight: 700;
  font-synthesis: none;
}

.bi .en {
  font-family: var(--font-body);
  font-size: 0.68em;
  font-weight: 700;
  opacity: 0.72;
  margin-top: 2px;
  letter-spacing: 0.01em;
}

.bi.inline {
  flex-direction: row;
  flex-wrap: wrap;
  align-items: baseline;
  column-gap: 0.45em;
}

.bi.inline .en {
  font-size: 0.8em;
  margin-top: 0;
}

body.no-en .bi .en {
  display: none;
}

/* Icons are emoji: prefer colour emoji fonts over look-alike glyphs in the display font. */
.game-emoji,
.big-emoji,
.prompt-emoji,
.intro-emoji,
.plant,
.legend-plant,
.badge-emoji,
.topic-emoji,
.streak-flame,
.word-chip-plant,
.word-detail-top,
.nav-icon,
.btn-icon,
.ex-tag-icon,
.toast-icon,
.level-emoji,
.plant-badge {
  font-family: var(--font-emoji);
}

/* The words being learned use a clear, standard Korean font. */
body [lang='ko'],
.ko-word {
  font-family: var(--font-ko);
}

/* ---------- Layout ---------- */

#app {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px 48px;
}

.page-head {
  margin: 28px 0 18px;
}

.page-sub {
  color: var(--ink-soft);
  max-width: 640px;
}

.section-title {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin: 34px 0 14px;
}

.section-hint {
  font-size: 0.8rem;
  color: var(--ink-soft);
  font-family: var(--font-body);
}

.card {
  background: var(--card);
  border: 2px solid var(--line);
  border-radius: var(--radius-l);
  box-shadow: 0 6px 0 var(--shadow);
  padding: 22px;
}

.card-title {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 14px;
}

.card-count {
  margin-left: auto;
  font-family: var(--font-body);
  font-size: 0.85rem;
  color: var(--ink-soft);
}

.big-emoji {
  font-size: 64px;
  line-height: 1;
}

/* Colour "tones" used by games and topics. */
.tone-pink {
  --tone: var(--pink);
  --tone-deep: var(--pink-deep);
  --tone-soft: var(--pink-soft);
  --tone-shadow: var(--pink-shadow);
}

.tone-mint {
  --tone: var(--mint);
  --tone-deep: var(--mint-deep);
  --tone-soft: var(--mint-soft);
  --tone-shadow: var(--mint-shadow);
}

.tone-butter {
  --tone: var(--butter);
  --tone-deep: var(--butter-deep);
  --tone-soft: var(--butter-soft);
  --tone-shadow: var(--butter-shadow);
}

.tone-sky {
  --tone: var(--sky);
  --tone-deep: var(--sky-deep);
  --tone-soft: var(--sky-soft);
  --tone-shadow: var(--sky-shadow);
}

.tone-lilac {
  --tone: var(--lilac);
  --tone-deep: var(--lilac-deep);
  --tone-soft: var(--lilac-soft);
  --tone-shadow: var(--lilac-shadow);
}

/* ---------- Top bar ---------- */

#topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  margin: 0 -20px;
  padding: 0 20px;
  background: var(--topbar-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 2px dashed var(--line);
}

.topbar-inner {
  display: flex;
  align-items: center;
  gap: 16px;
  min-height: 70px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--ink);
  text-decoration: none;
  font-size: 1.25rem;
  flex-shrink: 0;
}

.brand-mascot {
  width: 44px;
  height: 44px;
  display: block;
}

.brand-mascot svg {
  width: 100%;
  height: 100%;
}

.brand-mascot [data-show] {
  display: none;
}

.brand-mascot [data-show~='idle'] {
  display: inline;
}

.nav {
  display: flex;
  gap: 6px;
  margin: 0 auto;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 14px;
  border-radius: 999px;
  color: var(--ink);
  text-decoration: none;
  font-size: 1rem;
  border: 2px solid transparent;
  transition: background 0.15s;
}

.nav-link:hover {
  background: var(--card);
  border-color: var(--line);
}

.nav-link.active {
  background: var(--card);
  border-color: var(--pink);
  box-shadow: 0 3px 0 var(--pink);
}

.nav-icon {
  font-size: 1.15rem;
}

.stat-chips {
  display: flex;
  gap: 8px;
  flex-shrink: 0;
}

.stat-chip {
  display: inline-flex;
  align-items: center;
  padding: 5px 12px;
  border-radius: 999px;
  background: var(--card);
  border: 2px solid var(--line);
  font-weight: 800;
  font-size: 0.95rem;
  white-space: nowrap;
}

.stat-chip.streak {
  filter: grayscale(0.9);
  opacity: 0.8;
}

.stat-chip.streak.lit {
  filter: none;
  opacity: 1;
  border-color: var(--butter-deep);
  background: var(--butter-soft);
}

.stat-chip.level {
  background: var(--lilac-soft);
  border-color: var(--lilac);
}

.storage-warning {
  position: sticky;
  top: 0;
  z-index: 40;
  padding: 10px 16px;
  text-align: center;
  background: var(--butter-soft);
  border-bottom: 2px solid var(--butter-deep);
  font-size: 0.95rem;
}

/* While playing, the game gets the whole screen. */
body.playing #topbar,
body[data-screen='onboarding'] #topbar,
body[data-screen='summary'] #topbar {
  display: none;
}

/* ---------- Small screens ---------- */

@media (max-width: 860px) {
  .topbar-inner {
    flex-wrap: wrap;
    gap: 8px 12px;
    padding: 8px 0;
  }

  .nav {
    order: 3;
    width: 100%;
    justify-content: space-between;
    margin: 0;
  }

  .nav-link {
    flex: 1;
    justify-content: center;
    padding: 6px 8px;
  }

  .stat-chips {
    margin-left: auto;
  }
}

@media (max-width: 520px) {
  body {
    font-size: 16px;
  }

  #app {
    padding: 0 14px 40px;
  }

  #topbar {
    margin: 0 -14px;
    padding: 0 14px;
  }

  .brand .bi .en,
  .nav-link .bi .en {
    display: none;
  }

  .nav-link {
    flex-direction: column;
    gap: 0;
    font-size: 0.85rem;
  }

  h1 {
    font-size: 1.6rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}