/* ============================
   BANK EXAM QUIZ – STYLE
   ============================ */

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

:root {
  --bg-deep: #0a0e1a;
  --bg-card: rgba(255,255,255,0.04);
  --bg-card-hover: rgba(255,255,255,0.08);
  --glass: rgba(255,255,255,0.06);
  --border: rgba(255,255,255,0.08);
  --text: #e8ecf4;
  --text-dim: #8892a4;
  --accent-logic: #6c5ce7;
  --accent-logic-glow: rgba(108,92,231,0.35);
  --accent-prog: #00b894;
  --accent-prog-glow: rgba(0,184,148,0.35);
  --correct: #00b894;
  --correct-bg: rgba(0,184,148,0.12);
  --wrong: #ff6b6b;
  --wrong-bg: rgba(255,107,107,0.12);
  --radius: 16px;
  --radius-sm: 10px;
  --font: 'Noto Sans TC', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --transition: .25s cubic-bezier(.4,0,.2,1);
}

html { font-size: 16px; }

body {
  font-family: var(--font);
  background: var(--bg-deep);
  color: var(--text);
  line-height: 1.7;
  min-height: 100vh;
  overflow-x: hidden;
}

/* --- Particle Canvas --- */
#particleCanvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

/* --- App Container --- */
.app-container {
  position: relative;
  z-index: 1;
  max-width: 720px;
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
}

/* --- Screens --- */
.screen { display: none; }
.screen.active { display: block; animation: fadeUp .45s ease-out; }
[hidden] { display: none !important; }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(18px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ============================
   HOME SCREEN
   ============================ */
.hero {
  text-align: center;
  padding: 3rem 0 2rem;
}

.hero-badge {
  display: inline-block;
  font-size: .85rem;
  font-weight: 600;
  padding: .35rem 1rem;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--accent-logic), var(--accent-prog));
  color: #fff;
  margin-bottom: 1.25rem;
  letter-spacing: .5px;
}

.hero h1 {
  font-size: 2.4rem;
  font-weight: 900;
  line-height: 1.3;
  margin-bottom: .75rem;
}

.highlight {
  background: linear-gradient(135deg, var(--accent-logic), var(--accent-prog));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-sub {
  color: var(--text-dim);
  font-size: 1.05rem;
}

.install-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin: 0 0 1.25rem;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--glass);
  backdrop-filter: blur(14px);
}

.install-card h2 {
  font-size: 1rem;
  line-height: 1.3;
  margin-bottom: .2rem;
}

.install-card p {
  color: var(--text-dim);
  font-size: .9rem;
  line-height: 1.5;
}

.btn-install {
  flex: 0 0 auto;
  border: none;
  border-radius: var(--radius-sm);
  padding: .75rem 1rem;
  background: linear-gradient(135deg, var(--accent-logic), var(--accent-prog));
  color: #fff;
  font: inherit;
  font-size: .92rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform var(--transition), filter var(--transition);
}

.btn-install:hover {
  transform: translateY(-1px);
  filter: brightness(1.08);
}

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

/* --- Category Cards --- */
.category-grid {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.category-card {
  display: grid;
  grid-template-columns: auto 1fr auto;
  grid-template-rows: auto auto;
  align-items: center;
  gap: .75rem 1.25rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  cursor: pointer;
  transition: var(--transition);
  text-align: left;
  font-family: var(--font);
  color: var(--text);
  position: relative;
  overflow: hidden;
}

.category-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius);
  opacity: 0;
  transition: opacity .3s;
}

#cardLogic::before  { background: radial-gradient(circle at 30% 50%, var(--accent-logic-glow), transparent 70%); }
#cardProgramming::before { background: radial-gradient(circle at 30% 50%, var(--accent-prog-glow), transparent 70%); }

.category-card:hover::before { opacity: 1; }
.category-card:hover { border-color: rgba(255,255,255,0.15); transform: translateY(-3px); }

.card-icon {
  grid-row: 1 / 3;
  font-size: 2.75rem;
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 14px;
  background: var(--glass);
  position: relative;
  z-index: 1;
}

.card-body {
  position: relative;
  z-index: 1;
}

.card-body h2 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: .25rem;
}

.card-body p {
  font-size: .85rem;
  color: var(--text-dim);
  line-height: 1.5;
}

.card-progress {
  grid-column: 2;
  display: flex;
  align-items: center;
  gap: .75rem;
  position: relative;
  z-index: 1;
}

.progress-bar {
  flex: 1;
  height: 6px;
  border-radius: 3px;
  background: rgba(255,255,255,0.08);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  border-radius: 3px;
  transition: width .5s ease;
}

#cardLogic .progress-fill        { background: var(--accent-logic); }
#cardProgramming .progress-fill  { background: var(--accent-prog); }

.progress-text {
  font-size: .8rem;
  color: var(--text-dim);
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}

.card-arrow {
  grid-row: 1 / 3;
  font-size: 1.5rem;
  color: var(--text-dim);
  transition: var(--transition);
  position: relative;
  z-index: 1;
}

.category-card:hover .card-arrow { transform: translateX(4px); color: var(--text); }

/* --- Home Stats --- */
.home-stats {
  text-align: center;
  font-size: .85rem;
  color: var(--text-dim);
  padding: 1rem;
}

/* ============================
   QUIZ SCREEN
   ============================ */
.quiz-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.btn-back {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-dim);
  padding: .45rem 1rem;
  border-radius: var(--radius-sm);
  font-size: .9rem;
  cursor: pointer;
  font-family: var(--font);
  transition: var(--transition);
}
.btn-back:hover { color: var(--text); border-color: rgba(255,255,255,0.2); }

.quiz-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.quiz-category-label {
  font-size: .8rem;
  font-weight: 600;
  padding: .25rem .75rem;
  border-radius: 999px;
}

.quiz-category-label.logic       { background: var(--accent-logic); color: #fff; }
.quiz-category-label.programming { background: var(--accent-prog);  color: #fff; }

.quiz-counter {
  font-size: .85rem;
  color: var(--text-dim);
  font-variant-numeric: tabular-nums;
}

/* Progress bar at top */
.quiz-progress-bar {
  height: 4px;
  border-radius: 2px;
  background: rgba(255,255,255,0.06);
  margin-bottom: 2rem;
  overflow: hidden;
}

.quiz-progress-fill {
  height: 100%;
  border-radius: 2px;
  transition: width .4s ease;
}

.quiz-category-label.logic ~ .quiz-progress-fill,
.screen .logic .quiz-progress-fill { background: var(--accent-logic); }

/* --- Question Card --- */
.question-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  margin-bottom: 1.5rem;
  position: relative;
}

.question-number {
  display: inline-block;
  font-size: .75rem;
  font-weight: 700;
  padding: .2rem .65rem;
  border-radius: 6px;
  margin-bottom: .75rem;
  letter-spacing: 1px;
  background: rgba(255,255,255,0.06);
  color: var(--text-dim);
}

.question-text {
  font-size: 1.1rem;
  font-weight: 500;
  line-height: 1.8;
  white-space: pre-wrap;
}

/* --- Options --- */
.options-list {
  display: flex;
  flex-direction: column;
  gap: .75rem;
  margin-bottom: 1.5rem;
}

.option-btn {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1rem 1.25rem;
  cursor: pointer;
  font-family: var(--font);
  font-size: 1rem;
  color: var(--text);
  text-align: left;
  transition: var(--transition);
  line-height: 1.6;
  position: relative;
}

.option-btn:hover:not(.disabled) {
  background: var(--bg-card-hover);
  border-color: rgba(255,255,255,0.15);
  transform: translateX(4px);
}

.option-label {
  flex-shrink: 0;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: .85rem;
  background: rgba(255,255,255,0.06);
  transition: var(--transition);
}

.option-btn:hover:not(.disabled) .option-label {
  background: rgba(255,255,255,0.12);
}

/* Correct / Wrong states */
.option-btn.correct {
  background: var(--correct-bg);
  border-color: var(--correct);
}
.option-btn.correct .option-label {
  background: var(--correct);
  color: #fff;
}

.option-btn.wrong {
  background: var(--wrong-bg);
  border-color: var(--wrong);
}
.option-btn.wrong .option-label {
  background: var(--wrong);
  color: #fff;
}

.option-btn.disabled {
  cursor: default;
  opacity: .6;
}

.option-btn.correct.disabled,
.option-btn.wrong.disabled {
  opacity: 1;
}

/* --- Explanation --- */
.explanation-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  animation: fadeUp .35s ease-out;
}

.explanation-card.hidden { display: none; }

.explanation-header {
  display: flex;
  align-items: center;
  gap: .6rem;
  margin-bottom: .75rem;
}

.explanation-icon { font-size: 1.5rem; }

.explanation-title {
  font-size: 1.1rem;
  font-weight: 700;
}

.explanation-title.correct-title { color: var(--correct); }
.explanation-title.wrong-title   { color: var(--wrong);   }

.explanation-text {
  color: var(--text-dim);
  font-size: .95rem;
  line-height: 1.8;
  margin-bottom: 1.5rem;
}

.btn-next {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .7rem 1.75rem;
  border: none;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--accent-logic), var(--accent-prog));
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  font-family: var(--font);
  cursor: pointer;
  transition: var(--transition);
}

.btn-next:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(108,92,231,0.35);
}

/* --- Streak Popup --- */
.streak-popup {
  position: fixed;
  top: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #fdcb6e, #e17055);
  color: #fff;
  padding: .6rem 1.5rem;
  border-radius: 999px;
  font-weight: 700;
  font-size: 1rem;
  display: flex;
  align-items: center;
  gap: .5rem;
  z-index: 100;
  animation: popIn .4s ease-out;
  box-shadow: 0 4px 20px rgba(253,203,110,0.4);
}

.streak-popup.hidden { display: none; }

@keyframes popIn {
  0%   { transform: translateX(-50%) scale(.6); opacity: 0; }
  100% { transform: translateX(-50%) scale(1);  opacity: 1; }
}

.streak-fire { font-size: 1.3rem; }

/* ============================
   COMPLETE SCREEN
   ============================ */
.complete-card {
  text-align: center;
  padding: 3rem 1.5rem;
  animation: fadeUp .5s ease-out;
}

.complete-emoji {
  font-size: 4rem;
  margin-bottom: 1rem;
  animation: bounce 1s ease infinite alternate;
}

@keyframes bounce {
  0%   { transform: translateY(0); }
  100% { transform: translateY(-12px); }
}

.complete-title {
  font-size: 1.8rem;
  font-weight: 800;
  margin-bottom: 2rem;
}

/* Score ring */
.score-ring {
  position: relative;
  width: 140px;
  height: 140px;
  margin: 0 auto 1.5rem;
}

.score-ring svg {
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.ring-bg {
  fill: none;
  stroke: rgba(255,255,255,0.06);
  stroke-width: 8;
}

.ring-fill {
  fill: none;
  stroke: url(#scoreGradient);
  stroke-width: 8;
  stroke-linecap: round;
  stroke-dasharray: 326.73;
  stroke-dashoffset: 326.73;
  transition: stroke-dashoffset 1.2s ease;
}

.score-value {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  font-weight: 900;
}

.score-detail {
  color: var(--text-dim);
  font-size: 1.05rem;
  margin-bottom: 2.5rem;
}

.complete-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* --- Buttons --- */
.btn-primary {
  padding: .75rem 2rem;
  border: none;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--accent-logic), var(--accent-prog));
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  font-family: var(--font);
  cursor: pointer;
  transition: var(--transition);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(108,92,231,0.35);
}

.btn-danger {
  padding: .75rem 2rem;
  border: 1px solid var(--wrong);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--wrong);
  font-size: 1rem;
  font-weight: 600;
  font-family: var(--font);
  cursor: pointer;
  transition: var(--transition);
}

.btn-danger:hover {
  background: var(--wrong-bg);
  transform: translateY(-2px);
}

/* ============================
   RESPONSIVE
   ============================ */
@media (max-width: 600px) {
  .hero h1 { font-size: 1.8rem; }
  .category-card {
    grid-template-columns: auto 1fr;
    grid-template-rows: auto auto auto;
  }
  .card-arrow { display: none; }
  .card-progress { grid-column: 1 / -1; }
  .install-card {
    align-items: stretch;
    flex-direction: column;
  }
  .btn-install { width: 100%; }
  .question-card { padding: 1.5rem 1.25rem; }
  .complete-actions { flex-direction: column; }
  .btn-primary, .btn-danger { width: 100%; }
}

/* ============================
   CONFETTI (reused for celebration)
   ============================ */
.confetti-piece {
  position: fixed;
  width: 10px;
  height: 10px;
  border-radius: 2px;
  z-index: 200;
  animation: confettiFall 2.5s ease-in forwards;
  pointer-events: none;
}

@keyframes confettiFall {
  0%   { transform: translateY(-10vh) rotate(0deg);   opacity: 1; }
  100% { transform: translateY(110vh) rotate(720deg);  opacity: 0; }
}