:root {
  --bg-cream: #fff2f8;
  --bg-apricot: #ffd6e9;
  --bg-dot-a: #ffd3e7;
  --bg-dot-b: #ffe7f3;

  --panel: #fffdfd;
  --choco: #5d384f;
  --line-soft: #f4bfdc;
  --shadow-soft: 0 14px 32px rgba(149, 76, 121, 0.2);

  --honey: #f06cae;
  --honey-deep: #d64f95;
  --mint: #ff96c3;
  --mint-deep: #e66ab0;

  --hero-top: #fff8fc;
  --hero-bottom: #ffe4f2;
  --hero-border: #f5c3dd;
  --hero-eyebrow: #c64f8f;

  --bear-card-bg: #fff7fb;
  --bear-card-border: #f4b8d7;

  --chip-border: #efc6db;
  --chip-bg: #fff3f8;
  --chip-text: #75445d;
  --chip-active-border: #d85f9f;
  --chip-active-bg: #ffc5e3;

  --ghost-bg: #fff0f7;
  --ghost-border: #efc1dc;
  --ghost-text: #7a4460;

  --question-meta: #a05279;
  --mode-bg: #ffeef7;
  --mode-border: #efbfd8;
  --mode-text: #9d4f79;

  --equation-bg: #fff4fa;
  --equation-border: #efbdd6;

  --input-border: #e7bfd5;
  --input-bg: #fffdfd;
  --focus-ring: #f49cc880;
  --input-focus: #d965a2;

  --feedback-bg: #ffedf7;
  --feedback-border: #efbfd8;

  --stat-border: #ebc6da;
  --stat-bg: #fff6fb;
  --stat-label: #9b5c7c;

  --progress-bg: #f7d5e8;
  --progress-border: #eebad7;
  --progress-text: #965a79;

  --shelf-bg: #fff1f8;
  --shelf-border: #efbfd8;
  --sticker-border: #f0c4dc;
  --empty-note: #9e617f;

  --theme-panel-bg: #fff4fa;
  --theme-panel-border: #efc1db;
  --theme-text: #8b4f6d;
  --theme-focus: #de69a9;
}

body[data-theme="red"] {
  --bg-cream: #fff2f2;
  --bg-apricot: #ffd6d6;
  --bg-dot-a: #ffd6d6;
  --bg-dot-b: #ffeaea;

  --panel: #fffdfd;
  --choco: #5b3737;
  --line-soft: #efb7b7;
  --shadow-soft: 0 14px 32px rgba(143, 74, 74, 0.2);

  --honey: #ed5d5d;
  --honey-deep: #d34444;
  --mint: #f58a8a;
  --mint-deep: #db6161;

  --hero-top: #fff9f9;
  --hero-bottom: #ffe5e5;
  --hero-border: #f3c0c0;
  --hero-eyebrow: #bd4040;

  --bear-card-bg: #fff8f8;
  --bear-card-border: #f1b2b2;

  --chip-border: #ebc4c4;
  --chip-bg: #fff4f4;
  --chip-text: #714242;
  --chip-active-border: #d35a5a;
  --chip-active-bg: #ffc5c5;

  --ghost-bg: #fff1f1;
  --ghost-border: #edc0c0;
  --ghost-text: #784545;

  --question-meta: #a05151;
  --mode-bg: #fff0f0;
  --mode-border: #edc0c0;
  --mode-text: #9e4b4b;

  --equation-bg: #fff5f5;
  --equation-border: #edbcbc;

  --input-border: #e8bfbf;
  --input-bg: #fffdfd;
  --focus-ring: #ef9d9d80;
  --input-focus: #d75f5f;

  --feedback-bg: #ffecec;
  --feedback-border: #edbfbf;

  --stat-border: #ebc8c8;
  --stat-bg: #fff8f8;
  --stat-label: #945858;

  --progress-bg: #f5d2d2;
  --progress-border: #ebb7b7;
  --progress-text: #935858;

  --shelf-bg: #fff1f1;
  --shelf-border: #ebc0c0;
  --sticker-border: #efc5c5;
  --empty-note: #986060;

  --theme-panel-bg: #fff4f4;
  --theme-panel-border: #edc1c1;
  --theme-text: #8b4f4f;
  --theme-focus: #d66767;
}

body[data-theme="orange"] {
  --bg-cream: #fff6e8;
  --bg-apricot: #ffe2b8;
  --bg-dot-a: #ffd6a7;
  --bg-dot-b: #fff1d6;

  --panel: #fffef9;
  --choco: #5d4336;
  --line-soft: #f2d3a9;
  --shadow-soft: 0 14px 32px rgba(128, 91, 42, 0.18);

  --honey: #f2a932;
  --honey-deep: #da8922;
  --mint: #8ecfbf;
  --mint-deep: #62af99;

  --hero-top: #fff9f0;
  --hero-bottom: #ffeecf;
  --hero-border: #f0d5ab;
  --hero-eyebrow: #bf7a20;

  --bear-card-bg: #fff9ef;
  --bear-card-border: #f2c173;

  --chip-border: #e8c98f;
  --chip-bg: #fff4db;
  --chip-text: #6e4934;
  --chip-active-border: #cb7e24;
  --chip-active-bg: #ffd18c;

  --ghost-bg: #fff6e7;
  --ghost-border: #ecc487;
  --ghost-text: #7a523b;

  --question-meta: #9a6739;
  --mode-bg: #edf8f4;
  --mode-border: #c3e5da;
  --mode-text: #407969;

  --equation-bg: #fff7e9;
  --equation-border: #efc17a;

  --input-border: #e4cca3;
  --input-bg: #fffdf9;
  --focus-ring: #ffc76f66;
  --input-focus: #dda04f;

  --feedback-bg: #fff2d8;
  --feedback-border: #eccb94;

  --stat-border: #e8d1aa;
  --stat-bg: #fffaf0;
  --stat-label: #91633f;

  --progress-bg: #f5e3c7;
  --progress-border: #e4c189;
  --progress-text: #8a5f3c;

  --shelf-bg: #fff6e3;
  --shelf-border: #e7c283;
  --sticker-border: #eed0a2;
  --empty-note: #8f6845;

  --theme-panel-bg: #fff5e8;
  --theme-panel-border: #edc48b;
  --theme-text: #8c623d;
  --theme-focus: #d4933f;
}

body[data-theme="yellow"] {
  --bg-cream: #fffbe9;
  --bg-apricot: #fff3b7;
  --bg-dot-a: #fff0b8;
  --bg-dot-b: #fff9d7;

  --panel: #fffff9;
  --choco: #594c2a;
  --line-soft: #efe1a6;
  --shadow-soft: 0 14px 32px rgba(131, 112, 44, 0.2);

  --honey: #e6c33a;
  --honey-deep: #cba826;
  --mint: #9ecf82;
  --mint-deep: #79b45d;

  --hero-top: #fffef2;
  --hero-bottom: #fff7d6;
  --hero-border: #efe0a8;
  --hero-eyebrow: #b3911d;

  --bear-card-bg: #fffdf2;
  --bear-card-border: #ebd887;

  --chip-border: #eadfba;
  --chip-bg: #fffce8;
  --chip-text: #6c5c33;
  --chip-active-border: #c59e24;
  --chip-active-bg: #ffe483;

  --ghost-bg: #fffbe9;
  --ghost-border: #e8d691;
  --ghost-text: #746235;

  --question-meta: #8f7332;
  --mode-bg: #f6fae5;
  --mode-border: #dce9b3;
  --mode-text: #5d7537;

  --equation-bg: #fffce9;
  --equation-border: #ebd780;

  --input-border: #e4d7a8;
  --input-bg: #fffffb;
  --focus-ring: #efd67080;
  --input-focus: #cda333;

  --feedback-bg: #fff8dc;
  --feedback-border: #ead58b;

  --stat-border: #e9dcaf;
  --stat-bg: #fffdf2;
  --stat-label: #88703a;

  --progress-bg: #f4ebc8;
  --progress-border: #e5d595;
  --progress-text: #816937;

  --shelf-bg: #fff9e4;
  --shelf-border: #ead88c;
  --sticker-border: #ecdca5;
  --empty-note: #876f3b;

  --theme-panel-bg: #fffbe9;
  --theme-panel-border: #ebda92;
  --theme-text: #816733;
  --theme-focus: #c9a238;
}

body[data-theme="green"] {
  --bg-cream: #eefcf2;
  --bg-apricot: #d4f3de;
  --bg-dot-a: #ccefd8;
  --bg-dot-b: #e8f8ed;

  --panel: #fcfffd;
  --choco: #2f4d3e;
  --line-soft: #b8dfc5;
  --shadow-soft: 0 14px 32px rgba(74, 130, 99, 0.2);

  --honey: #4db784;
  --honey-deep: #349b6b;
  --mint: #78d3b2;
  --mint-deep: #4fb58f;

  --hero-top: #f6fff8;
  --hero-bottom: #dcf7e5;
  --hero-border: #bde4ca;
  --hero-eyebrow: #2f9c67;

  --bear-card-bg: #f5fff8;
  --bear-card-border: #aaddbc;

  --chip-border: #c3e5d0;
  --chip-bg: #effcf4;
  --chip-text: #35634d;
  --chip-active-border: #3ea170;
  --chip-active-bg: #bcf0d2;

  --ghost-bg: #eefbf3;
  --ghost-border: #bde4ca;
  --ghost-text: #36624e;

  --question-meta: #3e7658;
  --mode-bg: #e8fbf2;
  --mode-border: #b9e8d2;
  --mode-text: #2f7857;

  --equation-bg: #f0fcf5;
  --equation-border: #b8e4cb;

  --input-border: #c3e3d2;
  --input-bg: #fbfffd;
  --focus-ring: #7ecda580;
  --input-focus: #3da174;

  --feedback-bg: #ebf9f1;
  --feedback-border: #bbe3c8;

  --stat-border: #c2e2cf;
  --stat-bg: #f5fff8;
  --stat-label: #42725a;

  --progress-bg: #d3efdf;
  --progress-border: #b4dfc6;
  --progress-text: #3f7058;

  --shelf-bg: #ecfbf3;
  --shelf-border: #b8e2c6;
  --sticker-border: #c7e8d5;
  --empty-note: #4a765f;

  --theme-panel-bg: #effcf4;
  --theme-panel-border: #b8e2c6;
  --theme-text: #3e7057;
  --theme-focus: #429f72;
}

body[data-theme="blue"] {
  --bg-cream: #eff6ff;
  --bg-apricot: #d7e9ff;
  --bg-dot-a: #cfe2ff;
  --bg-dot-b: #e8f2ff;

  --panel: #fcfdff;
  --choco: #314561;
  --line-soft: #bfd4ef;
  --shadow-soft: 0 14px 32px rgba(77, 122, 181, 0.2);

  --honey: #5f9dec;
  --honey-deep: #417fd0;
  --mint: #84c3f4;
  --mint-deep: #589dd8;

  --hero-top: #f7fbff;
  --hero-bottom: #e2efff;
  --hero-border: #c3d7f2;
  --hero-eyebrow: #3a73bd;

  --bear-card-bg: #f5faff;
  --bear-card-border: #b8d1ef;

  --chip-border: #c8d8ed;
  --chip-bg: #f0f7ff;
  --chip-text: #3b5c86;
  --chip-active-border: #4d84ce;
  --chip-active-bg: #c5dcff;

  --ghost-bg: #edf5ff;
  --ghost-border: #bed3ed;
  --ghost-text: #3e608c;

  --question-meta: #47678f;
  --mode-bg: #ecf6ff;
  --mode-border: #bed8f0;
  --mode-text: #3f6696;

  --equation-bg: #f2f8ff;
  --equation-border: #bed7f0;

  --input-border: #c3d6eb;
  --input-bg: #fdfeff;
  --focus-ring: #80b7f280;
  --input-focus: #5187cd;

  --feedback-bg: #edf4ff;
  --feedback-border: #bfd3ed;

  --stat-border: #c6d8ed;
  --stat-bg: #f5f9ff;
  --stat-label: #4c6d95;

  --progress-bg: #d5e4f5;
  --progress-border: #b9cfea;
  --progress-text: #48688f;

  --shelf-bg: #edf5ff;
  --shelf-border: #bfd4ed;
  --sticker-border: #cbdcf0;
  --empty-note: #547096;

  --theme-panel-bg: #f0f7ff;
  --theme-panel-border: #bfd4ed;
  --theme-text: #4a6a91;
  --theme-focus: #4f84c9;
}

body[data-theme="purple"] {
  --bg-cream: #f4efff;
  --bg-apricot: #e3d7ff;
  --bg-dot-a: #d8c7ff;
  --bg-dot-b: #eee5ff;

  --panel: #fdfcff;
  --choco: #4b3b62;
  --line-soft: #d0c2eb;
  --shadow-soft: 0 14px 32px rgba(107, 84, 153, 0.2);

  --honey: #9c74e8;
  --honey-deep: #8259d1;
  --mint: #b897f2;
  --mint-deep: #9a73de;

  --hero-top: #faf7ff;
  --hero-bottom: #ece4ff;
  --hero-border: #d7caef;
  --hero-eyebrow: #7352bb;

  --bear-card-bg: #f9f6ff;
  --bear-card-border: #ccb9ee;

  --chip-border: #d6c9ec;
  --chip-bg: #f6f1ff;
  --chip-text: #5b4a79;
  --chip-active-border: #895ecd;
  --chip-active-bg: #dbc8ff;

  --ghost-bg: #f4eeff;
  --ghost-border: #cfbfee;
  --ghost-text: #5f4f81;

  --question-meta: #715d95;
  --mode-bg: #f1ecff;
  --mode-border: #d1c3ef;
  --mode-text: #6a5491;

  --equation-bg: #f7f3ff;
  --equation-border: #d1c3ef;

  --input-border: #d4c8ea;
  --input-bg: #fdfcff;
  --focus-ring: #b390f080;
  --input-focus: #865ecb;

  --feedback-bg: #f3ecff;
  --feedback-border: #d0c2ee;

  --stat-border: #d3c8eb;
  --stat-bg: #f9f7ff;
  --stat-label: #6f5a95;

  --progress-bg: #e1d7f5;
  --progress-border: #ccc0ea;
  --progress-text: #6a5790;

  --shelf-bg: #f3eeff;
  --shelf-border: #d0c3ee;
  --sticker-border: #d8cbef;
  --empty-note: #705e94;

  --theme-panel-bg: #f5f1ff;
  --theme-panel-border: #d1c4ee;
  --theme-text: #6c5791;
  --theme-focus: #8b63cb;
}

body[data-theme="pink"] {
  --bg-cream: #fff2f8;
  --bg-apricot: #ffd6e9;
  --bg-dot-a: #ffd3e7;
  --bg-dot-b: #ffe7f3;

  --panel: #fffdfd;
  --choco: #5d384f;
  --line-soft: #f4bfdc;
  --shadow-soft: 0 14px 32px rgba(149, 76, 121, 0.2);

  --honey: #f06cae;
  --honey-deep: #d64f95;
  --mint: #ff96c3;
  --mint-deep: #e66ab0;

  --hero-top: #fff8fc;
  --hero-bottom: #ffe4f2;
  --hero-border: #f5c3dd;
  --hero-eyebrow: #c64f8f;

  --bear-card-bg: #fff7fb;
  --bear-card-border: #f4b8d7;

  --chip-border: #efc6db;
  --chip-bg: #fff3f8;
  --chip-text: #75445d;
  --chip-active-border: #d85f9f;
  --chip-active-bg: #ffc5e3;

  --ghost-bg: #fff0f7;
  --ghost-border: #efc1dc;
  --ghost-text: #7a4460;

  --question-meta: #a05279;
  --mode-bg: #ffeef7;
  --mode-border: #efbfd8;
  --mode-text: #9d4f79;

  --equation-bg: #fff4fa;
  --equation-border: #efbdd6;

  --input-border: #e7bfd5;
  --input-bg: #fffdfd;
  --focus-ring: #f49cc880;
  --input-focus: #d965a2;

  --feedback-bg: #ffedf7;
  --feedback-border: #efbfd8;

  --stat-border: #ebc6da;
  --stat-bg: #fff6fb;
  --stat-label: #9b5c7c;

  --progress-bg: #f7d5e8;
  --progress-border: #eebad7;
  --progress-text: #965a79;

  --shelf-bg: #fff1f8;
  --shelf-border: #efbfd8;
  --sticker-border: #f0c4dc;
  --empty-note: #9e617f;

  --theme-panel-bg: #fff4fa;
  --theme-panel-border: #efc1db;
  --theme-text: #8b4f6d;
  --theme-focus: #de69a9;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--choco);
  font-family: "Gaegu", "Comic Sans MS", cursive;
  background:
    radial-gradient(circle at 8% 16%, #ffffffa8 0 9%, transparent 10%),
    radial-gradient(circle at 84% 18%, var(--bg-dot-b) 0 8%, transparent 9%),
    radial-gradient(circle at 78% 78%, var(--bg-dot-a) 0 10%, transparent 11%),
    linear-gradient(180deg, var(--bg-cream) 0%, var(--bg-apricot) 100%);
  padding: 24px;
}

.app-shell {
  width: min(980px, 100%);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 360px);
  grid-template-areas:
    "hero hero"
    "settings stats"
    "quiz stats";
  gap: 16px;
}

.hero,
.panel {
  border-radius: 24px;
  box-shadow: var(--shadow-soft);
}

.hero {
  grid-area: hero;
  background: linear-gradient(130deg, var(--hero-top) 0 55%, var(--hero-bottom) 56% 100%);
  border: 3px solid var(--hero-border);
  padding: 20px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 230px;
  gap: 18px;
  align-items: center;
  animation: slide-up 0.6s ease both;
}

.hero-copy h1 {
  margin: 4px 0;
  font-family: "Jua", "Gaegu", sans-serif;
  font-size: clamp(2rem, 4vw, 2.8rem);
  letter-spacing: 0.02em;
}

.eyebrow {
  margin: 0;
  font-family: "Jua", sans-serif;
  color: var(--hero-eyebrow);
  font-size: 0.95rem;
  letter-spacing: 0.06em;
}

.subtitle {
  margin: 0;
  font-size: 1.2rem;
  line-height: 1.35;
}

.bear-card {
  background: var(--bear-card-bg);
  border: 2px dashed var(--bear-card-border);
  border-radius: 18px;
  padding: 14px 14px 12px;
  text-align: center;
  display: grid;
  gap: 10px;
}

.bear-avatar {
  width: 138px;
  height: 130px;
  margin: 0 auto;
  border: 0;
  padding: 0;
  cursor: pointer;
  border-radius: 56% 56% 48% 48%;
  background: linear-gradient(180deg, #ba7a39, #8f5a2b);
  position: relative;
  box-shadow: inset 0 -8px 0 rgba(0, 0, 0, 0.08), 0 8px 16px rgba(80, 51, 23, 0.25);
  transition: transform 0.25s ease, filter 0.2s ease;
}

.bear-avatar:hover {
  filter: brightness(1.04);
}

.bear-avatar:focus-visible {
  outline: 3px solid var(--theme-focus);
  outline-offset: 4px;
}

.ear {
  position: absolute;
  top: -14px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: #a76831;
}

.ear::after {
  content: "";
  position: absolute;
  inset: 8px;
  border-radius: 50%;
  background: #f2bf87;
}

.ear-left {
  left: 10px;
}

.ear-right {
  right: 10px;
}

.eye {
  position: absolute;
  top: 52px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #33261c;
}

.eye-left {
  left: 42px;
}

.eye-right {
  right: 42px;
}

.snout {
  position: absolute;
  left: 50%;
  bottom: 26px;
  width: 62px;
  height: 42px;
  transform: translateX(-50%);
  border-radius: 45%;
  background: #f6d8ad;
}

.mouth {
  position: absolute;
  left: 50%;
  bottom: 38px;
  width: 26px;
  height: 14px;
  transform: translateX(-50%);
  border-bottom: 3px solid #58392a;
  border-radius: 0 0 20px 20px;
}

.blush {
  position: absolute;
  bottom: 42px;
  width: 14px;
  height: 9px;
  border-radius: 50%;
  background: #ef8894;
  opacity: 0.45;
}

.blush-left {
  left: 23px;
}

.blush-right {
  right: 23px;
}

.bear-avatar[data-mood="thinking"] {
  transform: rotate(-3deg);
}

.bear-avatar[data-mood="happy"] {
  transform: translateY(-2px);
}

.bear-avatar[data-mood="happy"] .mouth,
.bear-avatar[data-mood="celebrate"] .mouth {
  border-bottom-width: 4px;
  height: 16px;
}

.bear-avatar[data-mood="oops"] .mouth {
  border-bottom: 0;
  border-top: 3px solid #58392a;
  border-radius: 20px 20px 0 0;
}

.bear-avatar[data-mood="celebrate"] {
  animation: bounce 0.8s ease infinite;
}

.bear-message {
  margin: 0;
  font-size: 1rem;
  line-height: 1.2;
}

.bear-tip {
  margin: -2px 0 0;
  color: var(--theme-text);
  font-size: 0.9rem;
  font-weight: 700;
}

.theme-picker {
  border: 2px solid var(--theme-panel-border);
  background: var(--theme-panel-bg);
  border-radius: 14px;
  padding: 10px;
}

.theme-title {
  margin: 0 0 8px;
  font-family: "Jua", sans-serif;
  font-size: 0.93rem;
  color: var(--theme-text);
}

.theme-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 6px;
}

.theme-btn {
  border: 2px solid var(--chip-border);
  background: var(--chip-bg);
  border-radius: 10px;
  color: var(--chip-text);
  font-family: "Gaegu", cursive;
  font-size: 0.88rem;
  font-weight: 700;
  padding: 6px 4px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: transform 0.16s ease, background 0.2s ease;
}

.theme-btn::before {
  content: "";
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: 1.5px solid #ffffffcc;
  background: var(--swatch-color, #999999);
}

.theme-btn[data-theme="red"] {
  --swatch-color: #e25353;
}

.theme-btn[data-theme="orange"] {
  --swatch-color: #ea9b33;
}

.theme-btn[data-theme="yellow"] {
  --swatch-color: #d1b123;
}

.theme-btn[data-theme="green"] {
  --swatch-color: #4fae76;
}

.theme-btn[data-theme="blue"] {
  --swatch-color: #4e8bd8;
}

.theme-btn[data-theme="purple"] {
  --swatch-color: #9061d5;
}

.theme-btn[data-theme="pink"] {
  --swatch-color: #df66a2;
}

.theme-btn:hover {
  transform: translateY(-1px);
}

.theme-btn:focus-visible {
  outline: 3px solid var(--theme-focus);
  outline-offset: 1px;
}

.theme-btn.is-active {
  border-color: var(--chip-active-border);
  background: var(--chip-active-bg);
}

.panel {
  background: var(--panel);
  border: 3px solid var(--line-soft);
  padding: 18px;
  animation: slide-up 0.7s ease both;
}

.settings-panel {
  grid-area: settings;
  animation-delay: 0.08s;
}

.quiz-panel {
  grid-area: quiz;
  animation-delay: 0.14s;
}

.stats-panel {
  grid-area: stats;
  animation-delay: 0.2s;
}

h2 {
  margin: 0 0 12px;
  font-family: "Jua", sans-serif;
  font-size: 1.4rem;
}

.option-wrap + .option-wrap {
  margin-top: 14px;
}

.option-title {
  margin: 0 0 6px;
  font-size: 1.15rem;
  font-weight: 700;
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  border: 2px solid var(--chip-border);
  background: var(--chip-bg);
  border-radius: 999px;
  color: var(--chip-text);
  font-family: "Gaegu", cursive;
  font-size: 1rem;
  font-weight: 700;
  padding: 8px 12px;
  cursor: pointer;
  transition: transform 0.18s ease, background 0.2s ease;
}

.chip:hover {
  transform: translateY(-1px);
}

.chip.is-active {
  border-color: var(--chip-active-border);
  background: var(--chip-active-bg);
}

.btn {
  border: 0;
  border-radius: 14px;
  font-family: "Jua", sans-serif;
  font-size: 1rem;
  padding: 10px 14px;
  cursor: pointer;
  transition: transform 0.18s ease, opacity 0.2s ease;
}

.btn:hover:not(:disabled) {
  transform: translateY(-1px);
}

.btn:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

.btn-primary {
  background: linear-gradient(180deg, var(--honey), var(--honey-deep));
  color: #fffaf3;
}

.btn-ghost {
  background: var(--ghost-bg);
  border: 2px solid var(--ghost-border);
  color: var(--ghost-text);
}

#startBtn {
  margin-top: 16px;
  width: 100%;
  font-size: 1.05rem;
}

.quiz-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
}

.question-count {
  margin: 0;
  font-family: "Jua", sans-serif;
  color: var(--question-meta);
  font-size: 0.96rem;
}

.mode-pill {
  margin: 0;
  border-radius: 999px;
  background: var(--mode-bg);
  border: 2px solid var(--mode-border);
  color: var(--mode-text);
  padding: 3px 10px;
  font-family: "Jua", sans-serif;
  font-size: 0.86rem;
  white-space: nowrap;
}

.equation {
  margin: 16px 0;
  padding: 18px;
  border-radius: 18px;
  border: 2px dashed var(--equation-border);
  background: var(--equation-bg);
  font-family: "Jua", sans-serif;
  font-size: clamp(1.5rem, 4.5vw, 2.2rem);
  text-align: center;
  min-height: 88px;
  display: grid;
  place-items: center;
}

.answer-label {
  font-weight: 700;
  font-size: 1.02rem;
}

#answerInput {
  width: 100%;
  margin-top: 6px;
  border-radius: 12px;
  border: 2px solid var(--input-border);
  background: var(--input-bg);
  color: var(--choco);
  font-family: "Jua", sans-serif;
  font-size: 1.15rem;
  padding: 10px 12px;
}

#answerInput:focus {
  outline: 3px solid var(--focus-ring);
  border-color: var(--input-focus);
}

.quiz-actions {
  margin-top: 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.feedback {
  margin: 14px 0 0;
  border-radius: 14px;
  background: var(--feedback-bg);
  border: 2px solid var(--feedback-border);
  padding: 10px 12px;
  min-height: 52px;
  font-size: 1.02rem;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.stat-card {
  border-radius: 16px;
  border: 2px solid var(--stat-border);
  background: var(--stat-bg);
  padding: 10px;
}

.stat-label {
  margin: 0;
  color: var(--stat-label);
  font-size: 0.95rem;
}

.stat-value {
  margin: 4px 0 0;
  font-family: "Jua", sans-serif;
  font-size: 1.5rem;
}

.progress-group {
  margin-top: 14px;
}

.progress-bar {
  width: 100%;
  height: 14px;
  border-radius: 999px;
  overflow: hidden;
  background: var(--progress-bg);
  border: 2px solid var(--progress-border);
}

#progressFill {
  display: block;
  width: 0%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--mint), var(--mint-deep));
  transition: width 0.2s ease;
}

#progressText {
  margin: 8px 0 0;
  color: var(--progress-text);
  font-family: "Jua", sans-serif;
  font-size: 0.96rem;
}

.sticker-shelf {
  margin-top: 14px;
  border-radius: 16px;
  border: 2px dashed var(--shelf-border);
  background: var(--shelf-bg);
  padding: 10px;
  min-height: 70px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-content: flex-start;
}

.sticker {
  width: 36px;
  aspect-ratio: 1;
  border-radius: 10px;
  display: grid;
  place-items: center;
  font-size: 1.2rem;
  background: #ffffff;
  border: 2px solid var(--sticker-border);
  animation: pop 0.3s ease both;
}

.empty-note {
  margin: 0;
  width: 100%;
  color: var(--empty-note);
  font-size: 0.95rem;
}

.hidden {
  display: none;
}

@media (max-width: 860px) {
  body {
    padding: 14px;
  }

  .app-shell {
    grid-template-columns: 1fr;
    grid-template-areas:
      "hero"
      "settings"
      "quiz"
      "stats";
  }

  .hero {
    grid-template-columns: 1fr;
  }

  .bear-card {
    max-width: 320px;
    justify-self: center;
  }

  .theme-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@keyframes slide-up {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes bounce {
  0%,
  100% {
    transform: translateY(0);
  }
  30% {
    transform: translateY(-6px);
  }
  60% {
    transform: translateY(1px);
  }
}

@keyframes pop {
  from {
    opacity: 0;
    transform: scale(0.82);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}