@font-face {
  font-family: "Martian Grotesk";
  src: url("./MartianGrotesk-StdRg.woff2") format("woff2");
  font-style: normal;
  font-weight: 400;
  font-display: swap;
}

@font-face {
  font-family: "Martian Grotesk";
  src: url("./MartianGrotesk-sWdBl.woff2") format("woff2");
  font-style: normal;
  font-weight: 700;
  font-display: swap;
}

:root {
  color-scheme: light dark;
  --font-display: "Martian Grotesk", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-text: "Martian Grotesk", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --bg: #f4f2ea;
  --bg-elevated: rgba(255, 255, 255, 0.74);
  --bg-strong: rgba(255, 255, 255, 0.92);
  --surface-border: rgba(117, 104, 70, 0.12);
  --surface-shadow: 0 24px 60px rgba(43, 37, 23, 0.12);
  --text-main: #161515;
  --text-soft: rgba(22, 21, 21, 0.66);
  --accent: #1f8a70;
  --accent-strong: #16745e;
  --accent-soft: rgba(31, 138, 112, 0.12);
  --danger: #cc584c;
  --success: #1f8a70;
  --warning: #e7b94e;
  --button-neutral: rgba(255, 255, 255, 0.82);
  --button-neutral-border: rgba(53, 47, 36, 0.1);
  --progress-track: rgba(22, 21, 21, 0.08);
  --glow-one: rgba(249, 214, 160, 0.6);
  --glow-two: rgba(167, 225, 204, 0.45);
  --tab-background: rgba(22, 21, 21, 0.04);
  --tab-active: rgb(255, 255, 255);
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --radius-xl: 32px;
  --radius-lg: 24px;
  --radius-md: 18px;
  --radius-sm: 14px;
  --transition: 180ms ease;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111318;
    --bg-elevated: rgba(24, 27, 35, 0.76);
    --bg-strong: rgba(22, 25, 32, 0.92);
    --surface-border: rgba(255, 255, 255, 0.08);
    --surface-shadow: 0 28px 70px rgba(0, 0, 0, 0.35);
    --text-main: #f2efe8;
    --text-soft: rgba(242, 239, 232, 0.68);
    --accent: #56c0a1;
    --accent-strong: #77d5b8;
    --accent-soft: rgba(86, 192, 161, 0.16);
    --button-neutral: rgba(33, 36, 44, 0.92);
    --button-neutral-border: rgba(255, 255, 255, 0.08);
    --progress-track: rgba(255, 255, 255, 0.1);
    --glow-one: rgba(158, 115, 56, 0.28);
    --glow-two: rgba(47, 114, 96, 0.28);
    --tab-background: rgba(255, 255, 255, 0.04);
    --tab-active: rgba(255, 255, 255, 0.08);
  }
}

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

html,
body {
  height: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  font-family: var(--font-text);
  background: var(--bg);
  color: var(--text-main);
  overflow: hidden;
}

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

button {
  cursor: pointer;
}

.page {
  position: relative;
  height: 100%;
  overflow-x: hidden;
}

.page__defs {
  position: absolute;
  width: 0;
  height: 0;
}

.app {
  position: relative;
  display: flex;
  flex-direction: column;
  width: min(100%, 34rem);
  height: 100vh;
  height: 100dvh;
  margin: 0 auto;
  padding: calc(1.2rem + var(--safe-top)) 1rem 0;
  overflow: hidden;
}

.screen {
  display: none;
  flex: 1 1 auto;
  min-height: 0;
  animation: screen-fade 220ms ease;
}

.screen--active {
  display: block;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.app-footer {
  height: calc(20px + var(--safe-bottom));
  flex-shrink: 0;
}

.hero {
  padding: 1rem 0 1.4rem;
}

.hero__eyebrow,
.result-summary__eyebrow,
.game-status__mode,
.problem-card__subtitle {
  margin: 0 0 0.35rem;
  font-size: 0.88rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-soft);
}

.hero__title,
.result-summary__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2rem, 8vw, 3rem);
  line-height: 1.1;
  /* letter-spacing: -0.01em; */
}

.panel {
  position: relative;
  /* padding: 1.1rem; */
  /* background: var(--bg-elevated); */
  /* border: 1px solid var(--surface-border); */
  /* border-radius: var(--radius-xl); */
  /* box-shadow: var(--surface-shadow); */
  /* backdrop-filter: blur(18px); */
}

.panel--soft {
  /* background: var(--bg-strong); */
  margin-bottom: 20px;
}

.panel--game,
.panel--result {
  min-height: 100%;
}

.panel--game {
  display: flex;
  flex-direction: column;
}

.panel__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.9rem;
}

.panel__header--tight {
  margin-top: 1.25rem;
}

.panel__title {
  margin: 0;
  font-size: 0.9rem;
  font-weight: normal;
}

.panel__note {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-soft);
}

.difficulty-picker {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.35rem;
  padding: 0.25rem;
  background: var(--tab-background);
  border-radius: calc(var(--radius-lg) + 0.25rem);
}

.difficulty-picker__option {
  display: grid;
  place-items: center;
  gap: 0.25rem;
  min-height: 4.4rem;
  padding: 0.6rem 0.35rem;
  border: 0;
  border-radius: var(--radius-lg);
  background: transparent;
  color: var(--text-soft);
  transition: transform var(--transition), background var(--transition), color var(--transition);
}

.difficulty-picker__option--active {
  background: var(--tab-active);
  color: var(--text-main);
  box-shadow: inset 0 0 0 1px var(--button-neutral-border);
}

.difficulty-picker__emoji {
  font-size: 1.25rem;
}

.difficulty-picker__label {
  font-size: 0.8rem;
  font-weight: normal;
  letter-spacing: 0.03em;
}

.mode-grid, .action-stack {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.8rem;
}

.mode-card,
.action-button,
.answer-button {
  position: relative;
  width: 100%;
  border: 1px solid var(--button-neutral-border);
  border-radius: var(--radius-lg);
  background: var(--button-neutral);
  color: var(--text-main);
  transition:
    transform var(--transition),
    border-color var(--transition),
    background var(--transition),
    box-shadow var(--transition),
    color var(--transition);
}

.mode-card {
  display: grid;
  justify-items: start;
  gap: 0.8rem;
  padding: 1rem 1rem 1.2rem 1rem;
  text-align: left;
  box-shadow: 0 14px 26px rgba(27, 25, 18, 0.06);
}

.mode-card__icon,
.action-button__icon {
  display: grid;
  place-items: center;
  width: 2.7rem;
  height: 2.7rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
}

.mode-card__icon svg,
.action-button__icon svg {
  width: 1.25rem;
  height: 1.25rem;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.mode-card__title,
.action-button__label {
  font-size: 0.8rem;
  font-weight: normal;
  letter-spacing: 0.03em;
}

.mode-card__title {
  display: block;
  width: 100%;
  text-align: left;
  line-height: 1.2;
}

.action-button {
  display: grid;
  justify-items: start;
  gap: 0.8rem;
  padding: 1rem 1rem 1.2rem;
  box-shadow: 0 14px 26px rgba(27, 25, 18, 0.06);
}

.action-button--accent {
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  border-color: transparent;
  color: #fff;
}

.action-button--accent .action-button__icon {
  background: rgba(255, 255, 255, 0.16);
  color: #fff;
}

.action-button[disabled] {
  opacity: 0.5;
  cursor: not-allowed;
}

.game-status {
  margin-bottom: 1.6rem;
}

.game-status__meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.8rem;
}

.game-status__side {
  display: flex;
  align-items: center;
  gap: 0.55rem;
}

.game-status__counter {
  margin: 0;
  font-size: 0.95rem;
  color: var(--text-soft);
}

.icon-button {
  display: inline-grid;
  place-items: center;
  width: 2.35rem;
  height: 2.35rem;
  border: 1px solid var(--button-neutral-border);
  border-radius: 999px;
  background: var(--button-neutral);
  color: var(--text-soft);
  flex-shrink: 0;
  transition:
    transform var(--transition),
    border-color var(--transition),
    background var(--transition),
    color var(--transition);
}

.icon-button svg {
  width: 1rem;
  height: 1rem;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.progress {
  height: 0.85rem;
  overflow: hidden;
  background: var(--progress-track);
  border-radius: 999px;
}

.progress__bar {
  height: 100%;
  width: 8.333%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent), var(--accent-strong));
  transition: width 220ms ease;
}

.problem-card {
  padding: 1rem 0 1.2rem;
}

.problem-card__question {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 10vw, 4rem);
  line-height: 1;
  letter-spacing: 0.02em;
}

.answer-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.8rem;
  margin-top: auto;
}

.answer-button {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2.5rem 1.1rem;
  text-align: center;
  box-shadow: 0 14px 26px rgba(27, 25, 18, 0.06);
}

.answer-button__value {
  width: 100%;
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.answer-button--correct {
  background: rgba(31, 138, 112, 0.18);
  border-color: rgba(31, 138, 112, 0.5);
  color: var(--text-main);
}

.answer-button--wrong {
  background: rgba(204, 88, 76, 0.16);
  border-color: rgba(204, 88, 76, 0.45);
}

.answer-button--locked {
  pointer-events: none;
}

.result-summary {
  padding: 0.75rem 0 0.25rem;
}

.result-summary__title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.result-summary__score {
  margin: 1rem 0 1.2rem;
  font-family: var(--font-display);
  font-size: clamp(3rem, 15vw, 4.8rem);
  line-height: 0.95;
}

.confetti {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.mode-card:active,
.action-button:active,
.icon-button:active,
.answer-button:active,
.difficulty-picker__option:active {
  transform: scale(0.985);
}

.mode-card:focus-visible,
.action-button:focus-visible,
.icon-button:focus-visible,
.answer-button:focus-visible,
.difficulty-picker__option:focus-visible {
  outline: 3px solid rgba(31, 138, 112, 0.28);
  outline-offset: 3px;
}

@media (hover: hover) {
  .mode-card:hover,
  .action-button:hover,
  .icon-button:hover,
  .answer-button:hover,
  .difficulty-picker__option:hover {
    transform: translateY(-1px);
  }
}

@media (min-width: 640px) {
  .app {
    padding-left: 1.25rem;
    padding-right: 1.25rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

@keyframes screen-fade {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}