:root {
  color-scheme: light dark;
  --bg: #f7f7fb;
  --panel: rgba(255, 255, 255, 0.82);
  --panel-strong: #ffffff;
  --text: #17171c;
  --muted: #6c6b76;
  --line: rgba(20, 20, 28, 0.12);
  --accent: #007aff;
  --accent-ink: #ffffff;
  --success: #1f9d5b;
  --danger: #d83b37;
  --shadow: 0 18px 48px rgba(31, 35, 46, 0.12);
  --radius: 22px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101115;
    --panel: rgba(29, 30, 36, 0.82);
    --panel-strong: #1e2027;
    --text: #f7f7fb;
    --muted: #aaaab5;
    --line: rgba(255, 255, 255, 0.13);
    --accent: #0a84ff;
    --shadow: 0 18px 48px rgba(0, 0, 0, 0.36);
  }
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: var(--bg);
}

body {
  min-height: 100%;
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(0, 122, 255, 0.16), transparent 32rem),
    linear-gradient(180deg, var(--bg), var(--bg));
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
}

button,
input,
select {
  font: inherit;
}

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

.app-shell {
  width: min(100%, 520px);
  min-height: 100vh;
  min-height: 100dvh;
  margin: 0 auto;
  padding: max(18px, env(safe-area-inset-top)) 18px max(22px, env(safe-area-inset-bottom));
}

.screen {
  display: none;
  animation: rise 220ms ease-out;
}

.screen-active {
  display: block;
}

.hero {
  margin: 22px 0 28px;
  padding: 30px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow);
  text-align: center;
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.hero-icon {
  display: inline-grid;
  width: 74px;
  height: 74px;
  margin-bottom: 14px;
  place-items: center;
  border-radius: 24px;
  background: var(--panel-strong);
  font-size: 38px;
  box-shadow: inset 0 0 0 1px var(--line);
}

h1,
h2,
p {
  margin: 0;
}

h1 {
  font-size: clamp(2.3rem, 13vw, 4.25rem);
  line-height: 0.96;
  letter-spacing: 0;
}

h2 {
  font-size: 1.2rem;
  line-height: 1.2;
  letter-spacing: 0;
}

.hero p,
.top-bar p {
  margin-top: 8px;
  color: var(--muted);
}

.field-label {
  display: block;
  margin: 18px 0 8px;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 700;
}

.select,
.text-input {
  width: 100%;
  min-height: 54px;
  border: 1px solid var(--line);
  border-radius: 16px;
  color: var(--text);
  background: var(--panel-strong);
  padding: 0 16px;
  outline: none;
  transition: border-color 160ms ease, box-shadow 160ms ease, transform 160ms ease;
}

.select:focus,
.text-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(0, 122, 255, 0.18);
}

.button-stack {
  display: grid;
  gap: 12px;
  margin-top: 18px;
}

.toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-top: 12px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--panel);
  padding: 12px 14px;
}

.toggle-row strong,
.toggle-row small {
  display: block;
}

.toggle-row small {
  margin-top: 3px;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.25;
}

.toggle-row input {
  width: 24px;
  height: 24px;
  flex: 0 0 auto;
  accent-color: var(--accent);
}

.daily-status {
  margin-top: 12px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--panel);
  padding: 12px 14px;
  color: var(--muted);
  font-weight: 800;
  text-align: center;
}

.version-label {
  margin-top: 14px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
  text-align: center;
}

.button,
.icon-button {
  border: 0;
  color: var(--text);
  background: var(--panel-strong);
  box-shadow: inset 0 0 0 1px var(--line);
  transition: transform 150ms ease, filter 150ms ease, background 150ms ease;
}

.button {
  width: 100%;
  min-height: 56px;
  border-radius: 17px;
  padding: 0 18px;
  font-weight: 800;
}

.button-primary {
  color: var(--accent-ink);
  background: var(--accent);
  box-shadow: none;
}

.button:active,
.icon-button:active,
.suggestion:active {
  transform: scale(0.98);
  filter: brightness(0.96);
}

.top-bar {
  display: grid;
  grid-template-columns: 48px 1fr auto;
  align-items: center;
  gap: 12px;
  margin: 8px 0 20px;
}

.icon-button {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  font-size: 2rem;
  line-height: 1;
}

.score-pill {
  min-width: 104px;
  padding: 8px 10px;
  border-radius: 999px;
  background: var(--panel);
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
  line-height: 1.2;
  text-align: center;
  box-shadow: inset 0 0 0 1px var(--line);
}

.score-line {
  display: block;
  white-space: nowrap;
}

.flag-card {
  display: grid;
  height: 168px;
  place-items: center;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.flag {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  font-size: clamp(8.75rem, 44vw, 13rem);
  line-height: 1;
}

.flag img,
.flag-card img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  object-position: center;
  border-radius: 4px;
}

.answer-area {
  margin-top: 12px;
}

.suggestions {
  display: grid;
  gap: 8px;
  margin: 10px 0 14px;
}

.suggestions:empty {
  display: none;
}

.suggestion {
  min-height: 46px;
  border: 1px solid var(--line);
  border-radius: 14px;
  color: var(--text);
  background: var(--panel);
  padding: 0 14px;
  text-align: left;
}

.study-panel,
.results-panel,
.panel-list {
  display: grid;
  gap: 12px;
  margin-top: 18px;
}

#gameScreen .top-bar {
  margin-bottom: 12px;
}

#gameScreen .top-bar p {
  margin-top: 4px;
}

#gameScreen .field-label {
  margin-top: 10px;
  margin-bottom: 6px;
}

#gameScreen .text-input {
  min-height: 48px;
}

#gameScreen .button {
  min-height: 52px;
}

#gameScreen .suggestions {
  margin: 8px 0 10px;
}

#gameScreen .suggestion {
  min-height: 40px;
}

#gameScreen .study-panel {
  gap: 8px;
  margin-top: 10px;
}

#gameScreen .results-panel {
  gap: 8px;
  margin-top: 10px;
}

#gameScreen .result-text {
  padding: 12px 14px;
}

#gameScreen .facts {
  gap: 6px;
}

.study-panel[hidden],
.results-panel[hidden] {
  display: none;
}

.result-text,
.panel-item,
.empty-state {
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--panel);
  padding: 16px;
}

.result-text {
  font-weight: 900;
}

.result-text.correct {
  color: var(--success);
}

.result-text.wrong {
  color: var(--danger);
}

.facts {
  display: grid;
  gap: 10px;
  margin: 0;
}

.facts div,
.panel-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

dt,
.panel-label {
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 800;
}

dd,
.panel-value {
  margin: 0;
  font-weight: 900;
  text-align: right;
}

.empty-state {
  color: var(--muted);
  text-align: center;
}

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

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

@media (min-width: 700px) {
  .app-shell {
    display: grid;
    align-items: center;
  }

  .flag-card {
    height: 280px;
  }
}