/* RESET & TOKENS */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --blue:          #1a4a8a;
  --blue-dark:     #0f2d5c;
  --maroon:        #7A003C;
  --gold:          #FDBF57;
  --grey:          #495965;
  --green:         #2e7d32;
  --green-light:   #e8f5e9;
  --green-btn:     #3a7d34;
  --green-btn-dark:#2c6128;
  --bg:            #f4f4f4;
  --surface:       #ffffff;
  --text:          #212121;
  --text-muted:    #757575;
  --border:        #e0e0e0;
  --white:         #fff;
  --radius:        12px;
  --shadow:        0 2px 8px rgba(0,0,0,0.10);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Poppins', sans-serif;
  color: var(--text);
  min-height: 100dvh;
  /* centre on wide screens while staying mobile-first */
  max-width: 480px;
  margin: 0 auto;
  background-color: #fff;
  background-image: url("images/texture-paper-3.png");
}

/* SCREENS */
.screen {
  display: none;
  flex-direction: column;
  min-height: 100dvh;
}
.screen.active { display: flex; }

#home-screen {
  background-color: var(--white);
  border: 1px solid var(--border);
  border-radius: 15px;
}

/* HOME HEADER */
.home-header {
  background: var(--maroon);
  color: #fff;
  padding: 28px 20px 22px;
  text-align: center;
  flex-shrink: 0;
  border-top-right-radius: 15px;
  border-top-left-radius: 15px;
}
.home-header h1 {
  font-size: 1.45rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 6px;
}
.home-subtitle {
  font-size: 0.95rem;
  opacity: 0.85;
  letter-spacing: 0.02em;
}

/* CLUE GRID */
.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  padding: 20px;
  flex: 1;
  align-content: start;
}

.grid-btn {
  aspect-ratio: 1 / 1;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
  cursor: pointer;
  transition: transform 0.12s ease, box-shadow 0.12s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow);
  -webkit-tap-highlight-color: transparent;
}
.grid-btn:active { transform: scale(0.93); box-shadow: none; }

.grid-btn.completed {
  background: var(--green-light);
  border-color: var(--green);
  color: var(--green);
}

/* HOME FOOTER */
.home-footer {
  padding: 12px 20px 24px;
  text-align: center;
}
.btn-reset {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 0.8rem;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 2px;
  padding: 4px 8px;
  -webkit-tap-highlight-color: transparent;
}
.btn-reset:active { color: var(--text); }

/* RULES BUTTON */

.btn-rules-link{
  background: none;
  border: none;
  color: white;
  font-size: 0.85rem;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 2px;
  padding: 4px 8px;
  margin-top: 6px;
}

/* CLUE HEADER */
.clue-header {
  background: var(--maroon);
  color: #fff;
  padding: 14px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.back-btn {
  background: none;
  border: none;
  color: #fff;
  font-size: 1.6rem;
  line-height: 1;
  cursor: pointer;
  padding: 4px 6px;
  border-radius: 8px;
  -webkit-tap-highlight-color: transparent;
}
.back-btn:active { background: rgba(255,255,255,0.2); }
.clue-header h2 {
  font-size: 1.15rem;
  font-weight: 600;
}

/* CLUE CONTENT */
.clue-content {
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  flex: 1;
}

.clue-text-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  font-size: 1rem;
  line-height: 1.55;
  box-shadow: var(--shadow);
}

.clue-image {
  background: #dde0e4;
  border-radius: var(--radius);
  aspect-ratio: 4 / 3;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  box-shadow: var(--shadow);
  flex-shrink: 0;
}
.clue-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.placeholder-label {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* BUTTONS */
.btn-scan {
  background: var(--green-btn);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  padding: 16px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
  -webkit-tap-highlight-color: transparent;
}
.btn-scan:active { background: var(--green-btn-dark); }

.text-entry {
  display: flex;
  gap: 8px;
}
.text-entry input {
  flex: 1;
  padding: 14px 12px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  font-size: 1rem;
  background: var(--surface);
  color: var(--text);
  outline: none;
  transition: border-color 0.15s;
}
.text-entry input:focus { border-color: var(--maroon); }

.btn-submit {
  background: var(--maroon);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  padding: 14px 18px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  -webkit-tap-highlight-color: transparent;
}
.btn-submit:active { background: var(--blue-dark); }

/* FEEDBACK */
.feedback {
  border-radius: var(--radius);
  padding: 14px 16px;
  font-size: 0.95rem;
  font-weight: 500;
  text-align: center;
  line-height: 1.4;
}
.feedback.success {
  background: var(--green-light);
  color: var(--green);
  border: 1px solid #a5d6a7;
}
.feedback.error {
  background: #fde8e8;
  color: #c62828;
  border: 1px solid #ef9a9a;
}
.feedback.hidden { display: none; }

/* SCANNER OVERLAY */
.scanner-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.88);
  z-index: 100;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 20px;
  padding: 24px;
}
.scanner-overlay.hidden { display: none; }

.scanner-label {
  color: #fff;
  font-size: 1rem;
  font-weight: 500;
  text-align: center;
}

#qr-reader {
  width: 100%;
  max-width: 320px;
  border-radius: var(--radius);
  overflow: hidden;
}
/* html5-qrcode injects its own UI — tighten it up */
#qr-reader video { border-radius: var(--radius); }
#qr-reader__scan_region { border-radius: var(--radius); overflow: hidden; }

.btn-cancel-scan {
  background: #fff;
  color: var(--text);
  border: none;
  border-radius: var(--radius);
  padding: 14px 36px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}
.btn-cancel-scan:active { background: #e0e0e0; }

/* COMPLETION MODAL */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}
.modal-overlay.hidden { display: none; }

.modal {
  background: var(--surface);
  border-radius: 20px;
  padding: 36px 28px 28px;
  text-align: center;
  max-width: 320px;
  width: 100%;
  box-shadow: 0 12px 40px rgba(0,0,0,0.35);
}
.modal-icon { font-size: 2.8rem; margin-bottom: 12px; }
.modal h2 {
  font-size: 1.5rem;
  color: var(--green);
  margin-bottom: 12px;
}
.modal p {
  font-size: 1rem;
  color: var(--text);
  line-height: 1.55;
  margin-bottom: 28px;
}
.btn-modal-close {
  background: var(--green);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  padding: 14px 40px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}
.btn-modal-close:active { background: #256428; }