/* ════════════════════════════════════════════════════════════
   Clock Educator — style.css
   Mobile-first, child-friendly, full-featured
═══════════════════════════════════════════════════════════ */

/* ── Google Font ─────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Nunito:wght@400;700;800;900&display=swap');

/* ── Custom Properties ───────────────────────────────────── */
:root {
  --color-bg:        #f0f4ff;
  --color-primary:   #5f27cd;
  --color-secondary: #ff6b6b;
  --color-accent:    #feca57;
  --color-green:     #1dd1a1;
  --color-blue:      #54a0ff;
  --color-purple:    #5f27cd;
  --color-card-1:    #ff9ff3;
  --color-card-2:    #54a0ff;
  --color-card-3:    #feca57;
  --color-card-4:    #1dd1a1;
  --color-text:      #2d3436;
  --color-subtle:    #636e72;
  --color-white:     #ffffff;
  --shadow:          0 4px 20px rgba(0,0,0,0.10);
  --shadow-lg:       0 8px 32px rgba(0,0,0,0.15);
  --radius:          20px;
  --radius-sm:       12px;
  --font:            'Nunito', 'Baloo 2', 'Trebuchet MS', sans-serif;
  --transition:      0.2s ease;
}

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

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--color-bg);
  color: var(--color-text);
  min-height: 100dvh;
  overflow-x: hidden;
}

button {
  font-family: var(--font);
  font-weight: 800;
  cursor: pointer;
  border: none;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

/* ── App Shell ───────────────────────────────────────────── */
#app { display: flex; flex-direction: column; min-height: 100dvh; }

/* ── Header ──────────────────────────────────────────────── */
#main-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--color-primary);
  color: var(--color-white);
  padding: 12px 20px;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow);
}

#header-left { display: flex; align-items: center; gap: 8px; }
#app-logo    { font-size: 1.8rem; }
#app-title   { font-size: 1.3rem; font-weight: 900; letter-spacing: -0.5px; }

#header-right { display: flex; align-items: center; gap: 12px; position: relative; }

#star-display {
  display: flex;
  align-items: center;
  gap: 4px;
  background: rgba(255,255,255,0.2);
  border-radius: 50px;
  padding: 4px 12px;
}
#star-icon  { font-size: 1.3rem; }
#star-count { font-size: 1.1rem; font-weight: 900; }

.icon-btn {
  background: rgba(255,255,255,0.18);
  color: var(--color-white);
  border-radius: 50%;
  width: 44px; height: 44px;
  font-size: 1.2rem;
  display: flex; align-items: center; justify-content: center;
  transition: background var(--transition), transform var(--transition);
  user-select: none;
}
.icon-btn:hover  { background: rgba(255,255,255,0.32); }
.icon-btn:active { transform: scale(0.93); }

/* Hold-to-unlock bar */
#hold-bar-wrap {
  position: absolute;
  top: 54px; right: 0;
  background: var(--color-white);
  border-radius: 8px;
  padding: 6px 10px;
  box-shadow: var(--shadow);
  display: flex; flex-direction: column; align-items: center; gap: 4px;
  min-width: 140px;
  z-index: 200;
  font-size: 0.75rem;
  color: var(--color-subtle);
}
#hold-bar-wrap span { white-space: nowrap; }
#hold-bar {
  width: 0%;
  height: 6px;
  background: var(--color-green);
  border-radius: 4px;
  transition: width 0.05s linear;
  align-self: flex-start;
  max-width: 120px;
}

/* ── Main Content ────────────────────────────────────────── */
#main-content {
  flex: 1;
  padding: 20px 16px 40px;
  max-width: 700px;
  margin: 0 auto;
  width: 100%;
}

/* ── Mode Selector ───────────────────────────────────────── */
.welcome-msg {
  text-align: center;
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: 24px;
}

.mode-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.mode-card {
  background: var(--color-white);
  border-radius: var(--radius);
  padding: 24px 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
  min-height: 148px;
  border: 3px solid transparent;
}
.mode-card:nth-child(1) { border-color: var(--color-card-1); }
.mode-card:nth-child(2) { border-color: var(--color-card-2); }
.mode-card:nth-child(3) { border-color: var(--color-card-3); }
.mode-card:nth-child(4) { border-color: var(--color-card-4); }

.mode-card:hover  { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.mode-card:active { transform: scale(0.96); }

.mode-emoji { font-size: 3rem; }
.mode-title { font-size: 1.1rem; font-weight: 900; color: var(--color-text); text-align: center; }
.mode-desc  { font-size: 0.82rem; color: var(--color-subtle); text-align: center; font-weight: 700; }

/* ── Mode Header ─────────────────────────────────────────── */
.mode-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}
.mode-heading {
  flex: 1;
  font-size: 1.3rem;
  font-weight: 900;
  color: var(--color-primary);
}
.session-info {
  font-size: 0.9rem;
  font-weight: 800;
  color: var(--color-subtle);
  white-space: nowrap;
}

/* ── Buttons ─────────────────────────────────────────────── */
.btn {
  border-radius: 50px;
  padding: 14px 28px;
  font-size: 1rem;
  font-weight: 800;
  transition: transform var(--transition), box-shadow var(--transition), opacity var(--transition);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 52px;
}
.btn:hover  { transform: translateY(-2px); box-shadow: 0 4px 16px rgba(0,0,0,0.15); }
.btn:active { transform: scale(0.96); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

.btn-primary   { background: var(--color-primary); color: var(--color-white); }
.btn-secondary { background: var(--color-blue); color: var(--color-white); }
.btn-back      { background: rgba(95,39,205,0.1); color: var(--color-primary); padding: 10px 18px; font-size: 0.95rem; }
.btn-danger    { background: var(--color-secondary); color: var(--color-white); padding: 10px 20px; font-size: 0.9rem; }

.next-btn  { margin-top: 16px; width: 100%; }
.check-btn { margin-top: 16px; width: 100%; background: var(--color-green); }

/* ── Clock Wrap ──────────────────────────────────────────── */
.clock-wrap {
  display: flex;
  justify-content: center;
  align-items: center;
  margin: 8px 0;
}

.clock-svg {
  width: 220px;
  height: 220px;
  filter: drop-shadow(0 4px 12px rgba(0,0,0,0.12));
  touch-action: none;
  user-select: none;
}

.hand-group {
  transform-origin: 100px 100px;
}

/* ── Prompt Text ─────────────────────────────────────────── */
.prompt-text {
  text-align: center;
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: 8px;
}

/* ── Digital Time ────────────────────────────────────────── */
.digital-time {
  text-align: center;
  font-size: 2.6rem;
  font-weight: 900;
  color: var(--color-primary);
  letter-spacing: 2px;
  margin: 4px 0;
}

/* ── Time in Words ───────────────────────────────────────── */
.time-words {
  text-align: center;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-subtle);
  min-height: 1.6em;
  margin-bottom: 12px;
  text-transform: capitalize;
}

/* ── Read Mode ───────────────────────────────────────────── */
#read-container { display: flex; flex-direction: column; align-items: center; }

.choices-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  width: 100%;
  margin-top: 16px;
}

.choice-btn {
  background: var(--color-white);
  border: 3px solid #dfe6e9;
  border-radius: var(--radius-sm);
  padding: 18px 8px;
  font-size: 1.4rem;
  font-weight: 900;
  color: var(--color-text);
  box-shadow: var(--shadow);
  transition: transform var(--transition), border-color var(--transition), background var(--transition);
  min-height: 72px;
}
.choice-btn:hover:not(:disabled) { transform: translateY(-2px); border-color: var(--color-primary); }
.choice-btn:active:not(:disabled){ transform: scale(0.96); }

.correct-choice {
  background: #d1fae5 !important;
  border-color: var(--color-green) !important;
  animation: pulse-correct 0.4s ease;
}
.wrong-choice {
  background: #fee2e2 !important;
  border-color: var(--color-secondary) !important;
}

/* ── Feedback ────────────────────────────────────────────── */
.feedback {
  text-align: center;
  font-size: 1.15rem;
  font-weight: 800;
  border-radius: var(--radius-sm);
  padding: 12px 20px;
  margin-top: 14px;
  width: 100%;
}
.correct-feedback {
  background: #d1fae5;
  color: #065f46;
  animation: pop-in 0.3s ease;
}
.wrong-feedback {
  background: #fee2e2;
  color: #991b1b;
  animation: shake 0.4s ease;
}
.hidden { display: none !important; }

/* ── Set Mode ────────────────────────────────────────────── */
#set-container { display: flex; flex-direction: column; align-items: center; }

/* ── Match Game ──────────────────────────────────────────── */
#match-container { display: flex; flex-direction: column; align-items: center; }

.match-grid {
  display: grid;
  gap: 12px;
  width: 100%;
  margin-top: 8px;
}
.match-grid.pairs-2 { grid-template-columns: repeat(2, 1fr); }
.match-grid.pairs-4 { grid-template-columns: repeat(4, 1fr); }

.match-card {
  background: var(--color-white);
  border: 3px solid #dfe6e9;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8px;
  cursor: pointer;
  min-height: 100px;
  box-shadow: var(--shadow);
  transition: transform 0.18s ease, border-color 0.18s ease, background 0.18s ease;
  overflow: hidden;
}
.match-card:hover { transform: translateY(-2px); border-color: var(--color-blue); }
.match-card.selected {
  border-color: var(--color-primary);
  background: #f3eeff;
  transform: scale(1.04);
}
.match-card.matched {
  background: #d1fae5;
  border-color: var(--color-green);
  cursor: default;
  animation: flip-card 0.5s ease;
}
.match-clock-wrap { width: 100%; pointer-events: none; }
.match-clock-wrap .clock-svg { width: 100%; height: auto; max-width: 100px; }

.match-digital {
  font-size: 1.8rem;
  font-weight: 900;
  color: var(--color-primary);
}

/* ── Free Play Mode ──────────────────────────────────────── */
#freeplay-container { display: flex; flex-direction: column; align-items: center; }

/* ── Settings Modal ──────────────────────────────────────── */
.overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 500;
  padding: 16px;
  backdrop-filter: blur(3px);
}

.modal {
  background: var(--color-white);
  border-radius: var(--radius);
  padding: 28px 24px 24px;
  width: 100%;
  max-width: 460px;
  max-height: 90dvh;
  overflow-y: auto;
  position: relative;
  box-shadow: var(--shadow-lg);
}

.modal h2 {
  font-size: 1.4rem;
  font-weight: 900;
  color: var(--color-primary);
  margin-bottom: 20px;
}

.close-btn {
  position: absolute;
  top: 16px; right: 16px;
  background: #f1f3f5;
  color: var(--color-text);
  font-size: 1rem;
  width: 36px; height: 36px;
  border-radius: 50%;
}

.settings-body { display: flex; flex-direction: column; gap: 14px; margin-bottom: 20px; }

.setting-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-size: 0.95rem;
  font-weight: 700;
}
.setting-row span:first-child { flex: 1; color: var(--color-text); }

.setting-row input[type="range"] {
  width: 100px;
  accent-color: var(--color-primary);
}
.setting-row select {
  padding: 6px 10px;
  border-radius: 8px;
  border: 2px solid #dfe6e9;
  font-family: var(--font);
  font-weight: 700;
  font-size: 0.9rem;
  background: var(--color-white);
  color: var(--color-text);
  cursor: pointer;
}

/* Toggle switch */
.toggle-row input.toggle {
  appearance: none;
  -webkit-appearance: none;
  width: 52px; height: 28px;
  border-radius: 50px;
  background: #ccc;
  position: relative;
  cursor: pointer;
  transition: background 0.2s;
  flex-shrink: 0;
}
.toggle-row input.toggle::after {
  content: '';
  position: absolute;
  width: 22px; height: 22px;
  background: white;
  border-radius: 50%;
  top: 3px; left: 3px;
  transition: left 0.2s;
  box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}
.toggle-row input.toggle:checked { background: var(--color-green); }
.toggle-row input.toggle:checked::after { left: 27px; }

/* ── Milestone Popup ─────────────────────────────────────── */
.popup {
  background: var(--color-white);
  border-radius: var(--radius);
  padding: 40px 32px;
  text-align: center;
  box-shadow: var(--shadow-lg);
  max-width: 340px;
  width: 100%;
  animation: pop-in 0.35s cubic-bezier(0.175,0.885,0.32,1.275);
}
#milestone-icon  { font-size: 4rem; margin-bottom: 8px; }
#milestone-title { font-size: 1.6rem; font-weight: 900; color: var(--color-primary); margin-bottom: 8px; }
#milestone-msg   { font-size: 1rem; font-weight: 700; color: var(--color-subtle); margin-bottom: 20px; }

/* ── Confetti ────────────────────────────────────────────── */
#confetti-layer {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 999;
  overflow: hidden;
}

.confetti-piece {
  position: absolute;
  top: -10px;
  animation: confetti-fall linear forwards;
}

@keyframes confetti-fall {
  0%   { transform: translateY(0) rotate(0deg);   opacity: 1; }
  80%  { opacity: 1; }
  100% { transform: translateY(100vh) rotate(720deg); opacity: 0; }
}

/* ── Keyframe Animations ─────────────────────────────────── */
@keyframes pop-in {
  0%   { transform: scale(0.6); opacity: 0; }
  80%  { transform: scale(1.06); }
  100% { transform: scale(1);   opacity: 1; }
}

@keyframes shake {
  0%,100% { transform: translateX(0); }
  20%      { transform: translateX(-8px); }
  40%      { transform: translateX(8px); }
  60%      { transform: translateX(-6px); }
  80%      { transform: translateX(6px); }
}

@keyframes pulse-correct {
  0%   { transform: scale(1); }
  50%  { transform: scale(1.06); }
  100% { transform: scale(1); }
}

@keyframes star-spin {
  0%   { transform: rotate(0deg) scale(1); }
  50%  { transform: rotate(180deg) scale(1.4); }
  100% { transform: rotate(360deg) scale(1); }
}
.star-spin-anim { animation: star-spin 0.6s ease; }

@keyframes flip-card {
  0%   { transform: rotateY(0deg); }
  50%  { transform: rotateY(90deg); }
  100% { transform: rotateY(0deg); }
}

@keyframes celebration-bounce {
  0%,100% { transform: scale(1); }
  30%      { transform: scale(1.15); }
  60%      { transform: scale(0.95); }
}

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 400px) {
  .mode-grid { gap: 10px; }
  .mode-card { padding: 18px 10px; min-height: 130px; }
  .mode-emoji { font-size: 2.4rem; }
  .mode-title { font-size: 0.95rem; }
  .clock-svg  { width: 190px; height: 190px; }
  .choices-grid { gap: 8px; }
  .choice-btn { font-size: 1.2rem; min-height: 60px; }
  .match-grid.pairs-4 { grid-template-columns: repeat(2, 1fr); }
  .match-digital { font-size: 1.4rem; }
}

@media (min-width: 500px) {
  .clock-svg { width: 260px; height: 260px; }
  .mode-card { padding: 28px 20px; }
  .choice-btn { font-size: 1.5rem; }
}

@media (min-width: 640px) {
  #main-content { padding: 28px 24px 48px; }
  .mode-grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }
  .clock-svg { width: 280px; height: 280px; }
  .match-clock-wrap .clock-svg { max-width: 120px; }
}

/* ── Accessibility ───────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

button:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

/* ── Ad Banner ───────────────────────────────────────────── */
/*
 * #module-ad-wrap is injected by AdManager into <body>.
 * It sits at the bottom of the viewport and slides up after
 * the delay. It is never rendered on the home screen.
 */
#module-ad-wrap {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 50;                      /* below header (100) but above content */
  display: flex;
  justify-content: center;
  align-items: center;
  background: rgba(240, 244, 255, 0.96);
  border-top: 1px solid rgba(95, 39, 205, 0.15);
  padding: 4px 8px;
  min-height: 50px;
  max-height: 70px;
  transform: translateY(100%);      /* starts off-screen */
  transition: transform 0.4s ease;
  pointer-events: none;             /* invisible until revealed */
}

#module-ad-wrap.ad-visible {
  transform: translateY(0);
  pointer-events: auto;
}

/* Extra bottom padding on the module screen so content never
   hides behind the ad banner once it slides in.              */
body.ad-visible #main-content {
  padding-bottom: 60px;
}

/* Placeholder banner shown when ADS_ENABLED is false */
.ad-placeholder {
  width: 100%;
  max-width: 728px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(95, 39, 205, 0.06);
  border: 1px dashed rgba(95, 39, 205, 0.25);
  border-radius: var(--radius-sm);
}

.ad-placeholder-label {
  font-family: var(--font);
  font-size: 0.75rem;
  color: var(--color-subtle);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  user-select: none;
}

/* AdSense <ins> fill — applied when ADS_ENABLED is true */
#module-ad-wrap .adsbygoogle {
  width: 100%;
  max-width: 728px;
}

@media (max-width: 640px) {
  #module-ad-wrap {
    padding: 2px 6px;
    min-height: 50px;
  }
  body.ad-visible #main-content {
    padding-bottom: 58px;
  }
}

/* ── Contact Footer ──────────────────────────────────────── */
#contact-footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.25rem 0.5rem;
  padding: 10px 16px 14px;
  font-size: 0.75rem;
  color: var(--color-subtle);
  opacity: 0.75;
}

.contact-footer-label {
  white-space: nowrap;
}

.contact-footer-sep {
  color: var(--color-subtle);
}

.contact-footer-link {
  color: var(--color-subtle);
  text-decoration: underline;
  text-decoration-color: transparent;
  transition: color var(--transition), text-decoration-color var(--transition);
  white-space: nowrap;
}

.contact-footer-link:hover,
.contact-footer-link:focus-visible {
  color: var(--color-primary);
  text-decoration-color: var(--color-primary);
  outline: none;
}