/* ============================================================
   CapitalGuess — Game Stylesheet
   Self-contained styles for the CapitalGuess game
   ============================================================ */

/* ----------------------------------------------------------
   1. CSS Custom Properties
   ---------------------------------------------------------- */
:root {
  /* Game colors */
  --g-bg:            #0e1621;
  --g-surface:       #172032;
  --g-surface-2:     #1f2e45;
  --g-primary:       #8b5cf6;
  --g-primary-hover: #7c3aed;
  --g-accent:        #06b6d4;
  --g-success:       #22c55e;
  --g-error:         #ef4444;
  --g-text:          #f1f5f9;
  --g-text-muted:    #94a3b8;
  --g-border:        rgba(255, 255, 255, 0.08);

  /* Typography */
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;

  /* Spacing */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-12: 3rem;

  /* Shape */
  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
}

/* ----------------------------------------------------------
   2. Reset & Base
   ---------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  background-color: var(--g-bg);
  color: var(--g-text);
  min-height: 100dvh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

ul { list-style: none; }
a  { color: inherit; text-decoration: none; }

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* ----------------------------------------------------------
   3. Screens
   ---------------------------------------------------------- */
.screen {
  display: none;
  min-height: 100dvh;
}

.screen--active {
  display: block;
}

/* ----------------------------------------------------------
   4. Menu Screen
   ---------------------------------------------------------- */
.menu {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100dvh;
}

.menu__card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: var(--space-12) var(--space-6);
  width: 100%;
  max-width: 420px;
  gap: var(--space-4);
}

.menu__icon {
  font-size: 4rem;
  line-height: 1;
}

.menu__title {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, var(--g-primary), var(--g-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.menu__subtitle {
  font-size: 1rem;
  color: var(--g-text-muted);
  max-width: 280px;
}

/* Difficulty selector */
.menu__difficulty-wrap {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-top: var(--space-2);
}

.menu__difficulty-label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--g-text-muted);
  text-align: left;
}

.menu__difficulty {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
}

.diff-card {
  cursor: pointer;
}

.diff-card__input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.diff-card__body {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-4) var(--space-3);
  border-radius: var(--radius-lg);
  background-color: var(--g-surface);
  border: 2px solid var(--g-border);
  transition: background-color var(--transition-fast),
              border-color var(--transition-fast);
}

.diff-card__input:checked + .diff-card__body {
  background-color: rgba(139, 92, 246, 0.12);
  border-color: var(--g-primary);
}

.diff-card:hover .diff-card__body {
  border-color: rgba(139, 92, 246, 0.4);
}

.diff-card__input:focus-visible + .diff-card__body {
  outline: 2px solid var(--g-accent);
  outline-offset: 2px;
}

.diff-card__icon {
  font-size: 1.75rem;
  line-height: 1;
}

.diff-card__name {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--g-text);
}

.diff-card__desc {
  font-size: 0.75rem;
  color: var(--g-text-muted);
}

.menu__actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  width: 100%;
  margin-top: var(--space-2);
}

/* Menu footer */
.menu__footer {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-6) var(--space-6) var(--space-8);
  margin-top: auto;
}

.menu__footer-links {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.menu__footer-link {
  font-size: 0.8125rem;
  color: var(--g-text-muted);
  transition: color var(--transition-fast);
}

.menu__footer-link:hover {
  color: var(--g-text);
}

.menu__footer-sep {
  color: var(--g-border);
  font-size: 0.8125rem;
}

.menu__footer-brand {
  font-size: 0.8125rem;
  color: var(--g-text-muted);
  transition: color var(--transition-fast);
}

.menu__footer-brand:hover {
  color: var(--g-text);
}

.menu__footer-brand strong {
  background: linear-gradient(135deg, var(--g-primary), var(--g-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 700;
}

/* ----------------------------------------------------------
   5. Buttons
   ---------------------------------------------------------- */
.game-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  width: 100%;
  padding-block: var(--space-4);
  border-radius: var(--radius-lg);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  transition: background-color var(--transition-fast),
              transform var(--transition-fast),
              box-shadow var(--transition-fast);
  user-select: none;
}

.game-btn:focus-visible {
  outline: 2px solid var(--g-accent);
  outline-offset: 2px;
}

.game-btn--primary {
  background-color: var(--g-primary);
  color: #fff;
}

.game-btn--primary:hover {
  background-color: var(--g-primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(139, 92, 246, 0.4);
}

.game-btn--primary:active {
  transform: translateY(0);
}

.game-btn--secondary {
  background-color: var(--g-surface-2);
  color: var(--g-text);
  border: 1px solid var(--g-border);
}

.game-btn--secondary:hover {
  background-color: var(--g-surface);
  border-color: rgba(255, 255, 255, 0.15);
  transform: translateY(-1px);
}

/* ----------------------------------------------------------
   6. Back Button
   ---------------------------------------------------------- */
.back-btn {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--g-text-muted);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.back-btn:hover {
  color: var(--g-text);
  background-color: var(--g-surface-2);
}

.back-btn:focus-visible {
  outline: 2px solid var(--g-primary);
  outline-offset: 2px;
}

/* ----------------------------------------------------------
   7. Options Screen
   ---------------------------------------------------------- */
.options {
  max-width: 480px;
  margin-inline: auto;
  padding: var(--space-6) var(--space-4) var(--space-12);
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

.options__header {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.options__title {
  font-size: 1.25rem;
  font-weight: 700;
}

.options__section {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.options__label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--g-text-muted);
}

/* Pills */
.options__pills {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.pill {
  cursor: pointer;
}

.pill__input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.pill__text {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 52px;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-xl);
  font-size: 0.9375rem;
  font-weight: 600;
  background-color: var(--g-surface-2);
  border: 2px solid transparent;
  color: var(--g-text-muted);
  transition: background-color var(--transition-fast),
              border-color var(--transition-fast),
              color var(--transition-fast);
}

.pill__input:checked + .pill__text {
  background-color: rgba(139, 92, 246, 0.15);
  border-color: var(--g-primary);
  color: var(--g-primary);
}

.pill:hover .pill__text {
  border-color: rgba(139, 92, 246, 0.4);
  color: var(--g-text);
}

.pill__input:focus-visible + .pill__text {
  outline: 2px solid var(--g-accent);
  outline-offset: 2px;
}

.pill__text--active {
  background-color: rgba(139, 92, 246, 0.15);
  border-color: var(--g-primary);
  color: var(--g-primary);
}

/* Toggle rows */
.options__toggles {
  display: flex;
  flex-direction: column;
  gap: 0;
  border: 1px solid var(--g-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-4);
  background-color: var(--g-surface);
  border-bottom: 1px solid var(--g-border);
  transition: background-color var(--transition-fast);
}

.toggle-row:last-child {
  border-bottom: none;
}

.toggle-row:hover {
  background-color: var(--g-surface-2);
}

.toggle-row__label {
  font-size: 0.9375rem;
  font-weight: 600;
}

.toggle {
  cursor: pointer;
  flex-shrink: 0;
}

.toggle__input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle__track {
  display: flex;
  align-items: center;
  width: 44px;
  height: 26px;
  border-radius: 999px;
  background-color: var(--g-surface-2);
  border: 2px solid var(--g-border);
  padding: 2px;
  transition: background-color var(--transition-base),
              border-color var(--transition-base);
}

.toggle__thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background-color: var(--g-text-muted);
  transition: transform var(--transition-base),
              background-color var(--transition-base);
  flex-shrink: 0;
}

.toggle__input:checked ~ .toggle__track {
  background-color: rgba(34, 197, 94, 0.2);
  border-color: var(--g-success);
}

.toggle__input:checked ~ .toggle__track .toggle__thumb {
  transform: translateX(18px);
  background-color: var(--g-success);
}

.toggle__input:focus-visible ~ .toggle__track {
  outline: 2px solid var(--g-accent);
  outline-offset: 2px;
}

/* ----------------------------------------------------------
   8. Game Screen
   ---------------------------------------------------------- */
.game {
  display: flex;
  flex-direction: column;
  max-width: 480px;
  margin-inline: auto;
  padding-bottom: var(--space-12);
}

.game__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  gap: var(--space-4);
}

.game__score {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--g-text-muted);
}

.game__score strong {
  color: var(--g-accent);
  font-weight: 800;
}

.game__progress {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--g-text-muted);
  white-space: nowrap;
}

/* Progress bar */
.game__progress-bar {
  height: 4px;
  background-color: var(--g-surface-2);
  overflow: hidden;
}

.game__progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--g-primary), var(--g-accent));
  width: 0%;
  transition: width 400ms ease;
}

/* Flag */
.game__flag-wrap {
  position: relative;
  margin: var(--space-6) var(--space-4) var(--space-4);
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 3 / 2;
  background-color: var(--g-surface);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
}

.game__flag-skeleton {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    90deg,
    var(--g-surface) 25%,
    var(--g-surface-2) 50%,
    var(--g-surface) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.2s infinite;
}

.game__flag-skeleton.hidden {
  display: none;
}

@keyframes shimmer {
  0%   { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.game__flag {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transition: opacity 200ms ease;
}

.game__flag.loaded {
  opacity: 1;
}

/* Country name label */
.game__country-name {
  text-align: center;
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--g-text);
  padding: var(--space-4) var(--space-4) var(--space-2);
  letter-spacing: -0.01em;
}

/* Flag wrap when below the country name (remove top margin, name handles spacing) */
.game__country-name + .game__flag-wrap {
  margin-top: 0;
}

/* Easy mode choices */
.game__easy-mode {
  padding: 0;
}

.game__choices {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding-inline: var(--space-4);
}

.choice-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: var(--space-4) var(--space-6);
  border-radius: var(--radius-lg);
  font-size: 1rem;
  font-weight: 600;
  text-align: center;
  background-color: var(--g-surface);
  color: var(--g-text);
  border: 2px solid var(--g-border);
  cursor: pointer;
  transition: background-color var(--transition-fast),
              border-color var(--transition-fast),
              transform var(--transition-fast);
  user-select: none;
}

.choice-btn:hover:not(:disabled) {
  background-color: var(--g-surface-2);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-1px);
}

.choice-btn:focus-visible {
  outline: 2px solid var(--g-accent);
  outline-offset: 2px;
}

.choice-btn:disabled {
  cursor: default;
}

.choice-btn--correct {
  background-color: rgba(34, 197, 94, 0.15);
  border-color: var(--g-success);
  color: var(--g-success);
}

.choice-btn--wrong {
  background-color: rgba(239, 68, 68, 0.12);
  border-color: var(--g-error);
  color: var(--g-error);
}

/* Hard mode input */
.game__hard-mode {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  padding-inline: var(--space-4);
}

.game__hard-mode[hidden] {
  display: none;
}

/* Attempt dots */
.game__attempts {
  display: flex;
  justify-content: center;
  gap: var(--space-3);
}

.game__attempt-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: var(--g-primary);
  transition: background-color var(--transition-base), transform var(--transition-base);
}

.game__attempt-dot--used {
  background-color: var(--g-error);
  transform: scale(0.85);
}

/* Input row */
.game__input-row {
  display: flex;
  gap: var(--space-3);
}

.game__input {
  flex: 1;
  padding: var(--space-4) var(--space-4);
  background-color: var(--g-surface);
  color: var(--g-text);
  border: 2px solid var(--g-border);
  border-radius: var(--radius-lg);
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  outline: none;
  transition: border-color var(--transition-fast);
  min-width: 0;
}

.game__input::placeholder {
  color: var(--g-text-muted);
  font-weight: 400;
}

.game__input:focus {
  border-color: var(--g-primary);
}

.game__input--correct {
  border-color: var(--g-success);
  background-color: rgba(34, 197, 94, 0.08);
  color: var(--g-success);
}

.game__input--wrong {
  border-color: var(--g-error);
  background-color: rgba(239, 68, 68, 0.08);
}

.game__submit-btn {
  flex-shrink: 0;
  width: auto;
  padding-inline: var(--space-6);
}

/* Feedback text */
.game__feedback {
  font-size: 0.9375rem;
  font-weight: 600;
  text-align: center;
  min-height: 1.5em;
}

.game__feedback--wrong {
  color: var(--g-error);
}

.game__feedback--reveal {
  color: var(--g-text-muted);
}

/* Next button */
.game__next-wrap {
  padding: var(--space-4) var(--space-4) 0;
}

.game__next-wrap[hidden] {
  display: none;
}

/* ----------------------------------------------------------
   9. Result Screen
   ---------------------------------------------------------- */
.result {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  max-width: 380px;
  margin-inline: auto;
  padding: var(--space-12) var(--space-6);
  gap: var(--space-4);
}

.result__emoji {
  font-size: 4rem;
  line-height: 1;
}

.result__title {
  font-size: 1.75rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.result__score-wrap {
  display: flex;
  align-items: baseline;
  gap: var(--space-1);
  margin-block: var(--space-2);
}

.result__score-value {
  font-size: 4rem;
  font-weight: 800;
  line-height: 1;
  background: linear-gradient(135deg, var(--g-primary), var(--g-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.result__score-sep,
.result__score-total {
  font-size: 2rem;
  font-weight: 700;
  color: var(--g-text-muted);
}

.result__message {
  font-size: 1rem;
  color: var(--g-text-muted);
  max-width: 260px;
}

.result__actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  width: 100%;
  margin-top: var(--space-4);
}

/* ----------------------------------------------------------
   10. Info Sections (How to Play + FAQ)
   ---------------------------------------------------------- */
.info-section {
  width: 100%;
  padding: var(--space-8) var(--space-6);
  border-top: 1px solid var(--g-border);
}

.info-section__inner {
  max-width: 480px;
  margin-inline: auto;
}

.info-section__title {
  font-size: 1.375rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-6);
  text-align: center;
}

/* How to Play steps */
.htp-steps {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  list-style: none;
}

.htp-step {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
}

.htp-step__num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--g-primary), var(--g-accent));
  font-size: 0.875rem;
  font-weight: 800;
  color: #fff;
  flex-shrink: 0;
}

.htp-step__text {
  font-size: 0.9375rem;
  color: var(--g-text-muted);
  line-height: 1.6;
  padding-top: 5px;
}

/* FAQ accordion */
.faq {
  display: flex;
  flex-direction: column;
}

.faq__item {
  border-bottom: 1px solid var(--g-border);
}

.faq__item:first-child {
  border-top: 1px solid var(--g-border);
}

.faq__details {
  width: 100%;
}

.faq__question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: var(--space-4) 0;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--g-text);
  cursor: pointer;
  list-style: none;
  gap: var(--space-4);
  transition: color var(--transition-fast);
}

.faq__question::-webkit-details-marker { display: none; }

.faq__question::after {
  content: '';
  display: block;
  width: 16px;
  height: 16px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-size: contain;
  background-repeat: no-repeat;
  flex-shrink: 0;
  transition: transform var(--transition-base);
}

.faq__details[open] .faq__question::after {
  transform: rotate(180deg);
}

.faq__question:hover {
  color: var(--g-accent);
}

.faq__answer {
  padding-bottom: var(--space-4);
  font-size: 0.9375rem;
  color: var(--g-text-muted);
  line-height: 1.6;
}

/* ----------------------------------------------------------
   11. Responsive
   ---------------------------------------------------------- */
@media (max-width: 480px) {
  .menu__title {
    font-size: 2rem;
  }

  .diff-card__desc {
    font-size: 0.6875rem;
  }
}