/* ── CSS Variables ── */

:root {
  --bg: #ebe7f5;
  --text: #1e1340;
  --text-muted: #7c6f9e;
  --card-bg: #ffffff;
  --card-shadow: 0 2px 16px rgba(107, 75, 214, 0.1);
  --primary: #6b4bd6;
  --primary-hover: #5a3dc0;
  --input-bg: #ffffff;
  --input-border: #d4cef0;
  --input-border-focus: #6b4bd6;
  --btn-next-bg: #6b4bd6;
  --btn-next-color: #ffffff;
  --btn-next-hover: #5a3dc0;
  --btn-next-border: #5a3dc0;
  --select-bg: #ffffff;
  --meaning-color: #4a3d8f;
  --score-color: #7c6f9e;
  --score-span: #1e1340;
  --hint-color: #a09abf;
  --nav-bg: #ffffff;
  --nav-border: #d4cef0;
  --nav-active-bg: #6b4bd6;
  --nav-active-color: #ffffff;
  --nav-hover-bg: #f0ecff;
  --feedback-correct-bg: #dcfce7;
  --feedback-correct-color: #166534;
  --feedback-wrong-bg: #fee2e2;
  --feedback-wrong-color: #991b1b;
  --tile-bg: #ffffff;
  --tile-border: #d4cef0;
  --tile-hover-bg: #f5f3ff;
  --tile-correct-bg: #dcfce7;
  --tile-correct-border: #22c55e;
  --tile-correct-color: #166534;
  --tile-wrong-bg: #fee2e2;
  --tile-wrong-border: #ef4444;
  --tile-wrong-color: #991b1b;
}

[data-theme="dark"] {
  --bg: #13121e;
  --text: #f0eeff;
  --text-muted: #8c84aa;
  --card-bg: #1e1c2e;
  --card-shadow: 0 2px 20px rgba(0, 0, 0, 0.5);
  --primary: #7c61e8;
  --primary-hover: #6b52d4;
  --input-bg: #1e1c2e;
  --input-border: #302d48;
  --input-border-focus: #7c61e8;
  --btn-next-bg: #7c61e8;
  --btn-next-color: #ffffff;
  --btn-next-hover: #6b52d4;
  --btn-next-border: #6b52d4;
  --select-bg: #1e1c2e;
  --meaning-color: #a89fcc;
  --score-color: #7a7299;
  --score-span: #f0eeff;
  --hint-color: #6a6288;
  --nav-bg: #1e1c2e;
  --nav-border: #302d48;
  --nav-active-bg: #7c61e8;
  --nav-active-color: #ffffff;
  --nav-hover-bg: #252337;
  --feedback-correct-bg: #0d2218;
  --feedback-correct-color: #6ee09a;
  --feedback-wrong-bg: #220d0d;
  --feedback-wrong-color: #f08080;
  --tile-bg: #1e1c2e;
  --tile-border: #302d48;
  --tile-hover-bg: #252337;
  --tile-correct-bg: #0d2218;
  --tile-correct-border: #2ea855;
  --tile-correct-color: #6ee09a;
  --tile-wrong-bg: #220d0d;
  --tile-wrong-border: #c84040;
  --tile-wrong-color: #f08080;
}

/* ── Reset ── */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "Nunito", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  background: var(--bg);
  color: var(--text);
  padding: 2rem 1rem 3rem;
  transition: background 0.2s, color 0.2s;
}

/* ── Header ── */

.header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
  width: 100%;
  max-width: 620px;
}

h1 {
  font-size: 2rem;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.01em;
  flex: 1;
}

.hamburger {
  width: 38px;
  height: 38px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  background: none;
  border: 2px solid var(--input-border);
  border-radius: 10px;
  cursor: pointer;
  padding: 0;
  flex-shrink: 0;
  transition: background 0.15s, border-color 0.15s;
}

.hamburger:hover {
  background: var(--nav-hover-bg);
}

.hamburger:active {
  transform: scale(0.95);
}

.hamburger span {
  display: block;
  width: 16px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  pointer-events: none;
}

.theme-toggle {
  position: relative;
  width: 54px;
  height: 28px;
  border-radius: 14px;
  border: 2px solid var(--input-border);
  background: var(--btn-next-bg);
  cursor: pointer;
  padding: 0;
  flex-shrink: 0;
  transition: background 0.25s, border-color 0.25s;
}

.theme-toggle:active {
  transform: scale(0.95);
}

.toggle-thumb {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
  pointer-events: none;
}

[data-theme="dark"] .toggle-thumb {
  transform: translateX(26px);
}

.icon-sun,
.icon-moon {
  width: 11px;
  height: 11px;
  color: #fff;
  position: absolute;
  transition: opacity 0.15s;
}

.icon-moon { opacity: 0; }
[data-theme="dark"] .icon-sun  { opacity: 0; }
[data-theme="dark"] .icon-moon { opacity: 1; }

/* ── Help button ── */

.help-btn {
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  flex-shrink: 0;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--primary);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.15s;
}

.help-btn:hover {
  color: var(--primary-hover);
}

.help-btn:active {
  transform: scale(0.95);
}

/* ── Help modal ── */

.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  z-index: 100;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}

.modal-overlay.open {
  display: flex;
}

.modal {
  background: var(--card-bg);
  border-radius: 20px;
  padding: 2rem 1.75rem 1.75rem;
  max-width: 360px;
  width: 100%;
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.25);
  position: relative;
}

.modal h2 {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text);
  margin: 0 0 1.1rem;
}

.modal ol {
  margin: 0 0 1.25rem;
  padding-left: 1.4rem;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.modal li {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.4;
}

.modal-close {
  display: block;
  width: 100%;
  padding: 0.65rem;
  background: var(--btn-next-bg);
  color: #fff;
  border: none;
  border-radius: 12px;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.15s;
}

.modal-close:hover {
  background: var(--btn-next-hover);
}

/* ── Menu panel ── */

.menu-panel {
  display: none;
  flex-direction: column;
  width: 100%;
  max-width: 620px;
  background: var(--nav-bg);
  border: 2px solid var(--nav-border);
  border-radius: 14px;
  padding: 0.4rem;
  box-shadow: var(--card-shadow);
  margin-bottom: 1rem;
  transition: background 0.2s, border-color 0.2s;
}

.menu-panel.open {
  display: flex;
}

.menu-panel a {
  padding: 0.7rem 1.2rem;
  border-radius: 10px;
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-muted);
  transition: background 0.15s, color 0.15s;
}

.menu-panel a:hover {
  background: var(--nav-hover-bg);
  color: var(--text);
}

.menu-panel a.active {
  background: var(--nav-active-bg);
  color: var(--nav-active-color);
}

/* ── App container ── */

.app {
  width: 100%;
  max-width: 620px;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

/* ── Controls row ── */

.controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

select {
  padding: 0.5rem 1rem;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  border: 2px solid var(--input-border);
  border-radius: 10px;
  background: var(--select-bg);
  color: var(--text);
  outline: none;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
  flex: 1;
  min-width: 160px;
}

.mode-toggle {
  display: flex;
  gap: 0.3rem;
  background: var(--nav-bg);
  border: 2px solid var(--nav-border);
  border-radius: 10px;
  padding: 0.25rem;
}

.mode-toggle button {
  padding: 0.4rem 1rem;
  border-radius: 7px;
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 700;
  background: none;
  color: var(--text-muted);
  border: none;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
  white-space: nowrap;
}

.mode-toggle button:active {
  transform: none;
}

.mode-toggle button.active {
  background: var(--nav-active-bg);
  color: var(--nav-active-color);
}

/* ── Letter card ── */

.letter-card {
  background: var(--card-bg);
  border-radius: 20px;
  box-shadow: var(--card-shadow);
  padding: 2.5rem 2rem 2rem;
  text-align: center;
  transition: background 0.2s, box-shadow 0.2s;
}

.btn-show {
  background: var(--btn-next-bg);
  color: var(--btn-next-color);
  border: 2px solid var(--btn-next-border);
  width: 100%;
  margin-top: 0.5rem;
}

.btn-show:hover {
  background: var(--btn-next-hover);
}

.gujarati-word {
  font-weight: 800;
  line-height: 1.2;
  color: var(--text);
  margin-bottom: 1rem;
}

.hint {
  color: var(--hint-color);
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.prompt {
  color: var(--text-muted);
  font-size: 1rem;
  font-weight: 600;
}

/* ── Input ── */

.input-row {
  display: flex;
  gap: 0.6rem;
}

input[type="text"] {
  flex: 1;
  padding: 0.9rem 1.25rem;
  font-family: inherit;
  font-size: 1.1rem;
  font-weight: 600;
  border: 2px solid var(--input-border);
  border-radius: 14px;
  outline: none;
  background: var(--input-bg);
  color: var(--text);
  transition: border-color 0.2s, background 0.2s, color 0.2s;
}

input[type="text"]::placeholder {
  color: var(--text-muted);
  font-weight: 400;
}

input[type="text"]:focus {
  border-color: var(--input-border-focus);
}

button {
  padding: 0.9rem 1.5rem;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 700;
  border: none;
  border-radius: 14px;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
}

button:active {
  transform: scale(0.97);
}

.btn-check {
  background: var(--primary);
  color: #fff;
  white-space: nowrap;
}

.btn-check:hover {
  background: var(--primary-hover);
}

.btn-next {
  background: var(--btn-next-bg);
  color: var(--btn-next-color);
  border: 2px solid var(--btn-next-border);
  width: 100%;
}

.btn-next:hover {
  background: var(--btn-next-hover);
}

.btn-retry {
  background: var(--btn-next-bg);
  color: var(--btn-next-color);
  border: 2px solid var(--btn-next-border);
  width: 100%;
  margin-top: 0.5rem;
}

.btn-retry:hover {
  background: var(--btn-next-hover);
}

/* ── Feedback ── */

.feedback {
  padding: 0.9rem 1.25rem;
  border-radius: 12px;
  font-size: 1rem;
  font-weight: 700;
  display: none;
  margin-top: 0.5rem;
}

.feedback.correct {
  display: block;
  background: var(--feedback-correct-bg);
  color: var(--feedback-correct-color);
}

.feedback.wrong {
  display: block;
  background: var(--feedback-wrong-bg);
  color: var(--feedback-wrong-color);
}

/* ── Meaning ── */

.meaning {
  display: none;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--meaning-color);
  margin-top: 0.25rem;
}

.meaning.visible {
  display: block;
}

/* ── Tiles ── */

.tiles {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.tile {
  border-radius: 14px;
  font-family: inherit;
  font-size: 1.75rem;
  background: var(--tile-bg);
  border: 2px solid var(--tile-border);
  color: var(--text);
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
  text-align: center;
}

.tile:hover:not(:disabled) {
  background: var(--tile-hover-bg);
}

.tile:active:not(:disabled) {
  transform: scale(0.97);
}

.tile.correct {
  background: var(--tile-correct-bg);
  border-color: var(--tile-correct-border);
  color: var(--tile-correct-color);
  cursor: default;
}

.tile.wrong {
  background: var(--tile-wrong-bg);
  border-color: var(--tile-wrong-border);
  color: var(--tile-wrong-color);
  cursor: default;
}

.tile:disabled {
  cursor: default;
  opacity: 0.55;
}

.tile.correct:disabled,
.tile.wrong:disabled {
  opacity: 1;
}

/* ── Score ── */

.score {
  display: flex;
  justify-content: center;
  gap: 2rem;
  color: var(--score-color);
  font-size: 0.95rem;
  font-weight: 600;
  padding-top: 0.25rem;
}

.score span {
  font-weight: 800;
  color: var(--score-span);
}

/* ── Misc (used by words.html) ── */

.loading {
  color: var(--text-muted);
  font-size: 1.1rem;
  font-weight: 600;
  padding: 1rem 0;
}

.error {
  color: var(--feedback-wrong-color);
  background: var(--feedback-wrong-bg);
  padding: 1rem;
  border-radius: 12px;
  font-size: 0.95rem;
  font-weight: 600;
}

/* ── Responsive ── */

@media (max-width: 480px) {
  body {
    padding: 1.25rem 0.75rem 2rem;
  }

  h1 {
    font-size: 1.5rem;
  }

  .letter-card {
    padding: 1.75rem 1.25rem 1.5rem;
  }

  .controls {
    flex-direction: column;
    align-items: stretch;
  }

  .mode-toggle {
    justify-content: center;
  }

  .btn-check {
    width: 100%;
  }

  .input-row {
    flex-direction: column;
  }

  .score {
    gap: 1.25rem;
    font-size: 0.85rem;
  }
}