/* ─── Biogas Course — Quiz Styles ─────────────────────────────────────────── */

/* Container */
.quiz-container {
  max-width: 740px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

/* Individual question card */
.quiz-question {
  background: #ffffff;
  border: 2px solid #c8e6c9;
  border-left: 6px solid #2e7d32;
  border-radius: 8px;
  padding: 1.2rem 1.4rem 1rem;
  margin-bottom: 1.2rem;
  box-shadow: 0 2px 6px rgba(0,0,0,0.07);
  transition: border-color 0.2s;
}
.quiz-question:focus-within {
  border-color: #1b5e20;
  box-shadow: 0 2px 12px rgba(46,125,50,0.15);
}

/* Question text */
.quiz-question > p:first-child {
  margin: 0 0 0.85rem;
  font-size: 1.02rem;
  font-weight: 600;
  color: #1a1a1a;
  line-height: 1.45;
}

/* ── Radio / Checkbox options ──────────────────────────────────────────────── */

.quiz-question label {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  margin: 0.3rem 0;
  padding: 0.5rem 0.7rem;
  border-radius: 6px;
  border: 1.5px solid #e0e0e0;
  background: #fafafa;
  cursor: pointer;
  font-size: 0.97rem;
  color: #222;
  line-height: 1.45;
  transition: background 0.15s, border-color 0.15s;
  user-select: none;
}
.quiz-question label:hover {
  background: #e8f5e9;
  border-color: #81c784;
}
.quiz-question label input[type="radio"],
.quiz-question label input[type="checkbox"] {
  margin-top: 0.18rem;
  flex-shrink: 0;
  accent-color: #2e7d32;
  width: 1.05rem;
  height: 1.05rem;
}

/* ── Fill-in-blank & Number inputs ─────────────────────────────────────────── */

.quiz-question input[type="text"],
.quiz-question input[type="number"] {
  display: block;
  margin-top: 0.5rem;
  padding: 0.5rem 0.75rem;
  font-size: 1rem;
  border: 2px solid #bbb;
  border-radius: 6px;
  width: 100%;
  max-width: 360px;
  box-sizing: border-box;
  transition: border-color 0.15s;
  background: #fff;
  color: #111;
}
.quiz-question input[type="text"]:focus,
.quiz-question input[type="number"]:focus {
  border-color: #2e7d32;
  outline: none;
  box-shadow: 0 0 0 3px rgba(46,125,50,0.12);
}
.quiz-input-hint {
  font-size: 0.82rem;
  color: #666;
  margin-top: 0.3rem;
}

/* ── Drag-to-match ─────────────────────────────────────────────────────────── */

.match-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem 1.5rem;
  margin-top: 0.5rem;
}
.match-col-label {
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #555;
  margin-bottom: 0.35rem;
}
.match-left,
.match-right {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}
.match-left li {
  background: #f1f8e9;
  border: 2px dashed #aed581;
  border-radius: 6px;
  padding: 0.45rem 0.7rem;
  font-size: 0.93rem;
  color: #1a1a1a;
  min-height: 2.4rem;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.3rem;
  transition: background 0.15s, border-color 0.15s;
}
.match-right li {
  background: #e3f2fd;
  border: 2px solid #90caf9;
  border-radius: 6px;
  padding: 0.45rem 0.7rem;
  font-size: 0.93rem;
  color: #0d47a1;
  cursor: grab;
  transition: background 0.15s, transform 0.1s, box-shadow 0.1s;
  user-select: none;
}
.match-right li:hover {
  background: #bbdefb;
  box-shadow: 0 2px 6px rgba(0,0,0,0.12);
  transform: translateY(-1px);
}
.match-right li:active { cursor: grabbing; }
.match-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 3px 10px;
  background: #1565c0;
  color: #fff;
  border-radius: 20px;
  font-size: 0.85rem;
  cursor: pointer;
  font-weight: 500;
  transition: background 0.15s;
}
.match-badge::after {
  content: "×";
  font-size: 0.9rem;
  opacity: 0.75;
}
.match-badge:hover { background: #b71c1c; }

/* ── Feedback line ─────────────────────────────────────────────────────────── */

.feedback {
  margin-top: 0.7rem;
  padding: 0.45rem 0.75rem;
  border-radius: 5px;
  font-weight: 600;
  font-size: 0.97rem;
  min-height: 1.8rem;
  transition: background 0.2s;
}
.feedback:empty { display: none; }

/* ── Result banner ─────────────────────────────────────────────────────────── */

.quiz-result-banner {
  margin-top: 1.2rem;
  padding: 1rem 1.4rem;
  border-radius: 8px;
  font-size: 1.1rem;
  font-weight: 700;
  background: #e8f5e9;
  border: 2px solid #a5d6a7;
  color: #1b5e20;
}

/* ── Check button ──────────────────────────────────────────────────────────── */

.quiz-check-btn {
  display: inline-block;
  margin-top: 1rem;
  padding: 0.6rem 2rem;
  background: #2e7d32;
  color: #fff;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  box-shadow: 0 2px 6px rgba(46,125,50,0.25);
  transition: background 0.15s, box-shadow 0.15s, transform 0.1s;
}
.quiz-check-btn:hover {
  background: #1b5e20;
  box-shadow: 0 4px 12px rgba(46,125,50,0.3);
  transform: translateY(-1px);
}
.quiz-check-btn:active {
  transform: translateY(0);
  box-shadow: 0 1px 4px rgba(46,125,50,0.2);
}

/* ── Submit section ────────────────────────────────────────────────────────── */

.quiz-submit-section {
  margin-top: 1.5rem;
  padding: 1rem 1.4rem;
  background: #e8f5e9;
  border: 1px solid #c8e6c9;
  border-radius: 8px;
  font-size: 0.97rem;
  color: #1b5e20;
}
.quiz-submit-section p { margin: 0 0 0.7rem; font-weight: 600; }
.quiz-submit-btn {
  display: inline-block;
  padding: 0.55rem 1.5rem;
  background: #1565c0;
  color: #fff;
  border-radius: 6px;
  text-decoration: none;
  font-size: 0.97rem;
  font-weight: 700;
  box-shadow: 0 2px 6px rgba(21,101,192,0.22);
  transition: background 0.15s;
}
.quiz-submit-btn:hover { background: #0d47a1; }

/* ── Question type badges ──────────────────────────────────────────────────── */

.q-type-badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 1px 7px;
  border-radius: 10px;
  margin-right: 0.4rem;
  vertical-align: middle;
  position: relative;
  top: -1px;
}
.q-type-badge.mc   { background: #e3f2fd; color: #1565c0; }
.q-type-badge.tf   { background: #f3e5f5; color: #6a1b9a; }
.q-type-badge.fill { background: #fff8e1; color: #e65100; }
.q-type-badge.num  { background: #fce4ec; color: #880e4f; }
.q-type-badge.match { background: #e8f5e9; color: #1b5e20; }

/* ─── Badge system ─────────────────────────────────────────────────────────── */

@keyframes badgePop {
  0%   { transform: scale(0.2) translateY(30px); opacity: 0; }
  55%  { transform: scale(1.18) translateY(-6px); opacity: 1; }
  75%  { transform: scale(0.93) translateY(2px); }
  100% { transform: scale(1) translateY(0); opacity: 1; }
}
@keyframes badgeGlow {
  0%, 100% { box-shadow: 0 0 16px rgba(255,215,0,0.4), 0 4px 20px rgba(0,0,0,0.18); }
  50%       { box-shadow: 0 0 36px rgba(255,215,0,0.8), 0 4px 28px rgba(0,0,0,0.22); }
}
@keyframes confettiFall {
  0%   { transform: translateY(-20px) rotate(0deg); opacity: 1; }
  100% { transform: translateY(80px) rotate(360deg); opacity: 0; }
}

/* Popup overlay */
#biogas-badge-popup {
  position: fixed;
  inset: 0;
  z-index: 9997;
  background: rgba(0,0,0,0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
#biogas-badge-popup .badge-popup-card {
  background: #fff;
  border-radius: 16px;
  padding: 2rem 2.5rem;
  text-align: center;
  max-width: 340px;
  width: 90%;
  box-shadow: 0 8px 40px rgba(0,0,0,0.25);
  animation: badgePop 0.55s cubic-bezier(.22,1,.36,1) forwards;
  position: relative;
  overflow: hidden;
}
#biogas-badge-popup .badge-popup-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 5px;
  background: linear-gradient(90deg, #2e7d32, #81c784, #2e7d32);
}
.badge-popup-icon {
  width: 90px;
  height: 90px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.6rem;
  margin: 0 auto 1rem;
  animation: badgeGlow 1.8s ease-in-out infinite;
}
.badge-popup-earned {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: #888;
  margin: 0 0 0.3rem;
}
.badge-popup-title {
  font-size: 1.6rem;
  font-weight: 800;
  margin: 0 0 0.25rem;
}
.badge-popup-sub {
  font-size: 0.95rem;
  color: #555;
  margin: 0 0 1.2rem;
}
.badge-popup-score {
  display: inline-block;
  padding: 0.3rem 1rem;
  border-radius: 20px;
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: 1.2rem;
}
.badge-popup-close {
  display: block;
  width: 100%;
  padding: 0.55rem;
  background: #2e7d32;
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.15s;
}
.badge-popup-close:hover { background: #1b5e20; }
.badge-popup-timer {
  font-size: 0.78rem;
  color: #bbb;
  margin-top: 0.5rem;
}

/* Badge row in progress bar */
.biogas-badge-row {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
  padding: 4px 16px 6px;
  border-top: 1px solid #f0f0f0;
}
.biogas-badge-row .badge-row-label {
  font-size: 0.78rem;
  color: #666;
  white-space: nowrap;
  font-weight: 600;
  margin-right: 2px;
}
.badge-pip {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  border: 2.5px solid;
  cursor: default;
  transition: transform 0.2s, box-shadow 0.2s;
  flex-shrink: 0;
  position: relative;
}
.badge-pip.earned {
  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}
.badge-pip.earned:hover {
  transform: scale(1.25);
  box-shadow: 0 4px 14px rgba(0,0,0,0.22);
  z-index: 10;
}
.badge-pip.locked {
  background: #eee !important;
  border-color: #ccc !important;
  opacity: 0.35;
  filter: grayscale(1);
  font-size: 0.85rem;
}
.badge-pip-tooltip {
  position: absolute;
  bottom: calc(100% + 6px);
  left: 50%;
  transform: translateX(-50%);
  background: #333;
  color: #fff;
  font-size: 0.72rem;
  white-space: nowrap;
  padding: 3px 8px;
  border-radius: 4px;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.15s;
}
.badge-pip:hover .badge-pip-tooltip { opacity: 1; }