/* JLPT Study Hub — custom layer on Bootstrap 5 */
:root {
  --jlpt-indigo: #1e3a5f;
  --jlpt-indigo-light: #2c5282;
  --jlpt-vermillion: #c53030;
  --jlpt-gold: #d69e2e;
  --jlpt-cream: #faf8f5;
  --jlpt-ink: #1a202c;
  --jlpt-muted: #718096;
  --jlpt-card-shadow: 0 4px 24px rgba(30, 58, 95, 0.08);
  --jlpt-radius: 12px;
  --font-jp: "Noto Sans JP", "Hiragino Kaku Gothic ProN", sans-serif;
  --font-display: "Playfair Display", "Noto Serif JP", serif;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-jp);
  background: var(--jlpt-cream);
  color: var(--jlpt-ink);
  min-height: 100vh;
}

/* Navbar */
.navbar-jlpt {
  background: linear-gradient(135deg, var(--jlpt-indigo) 0%, var(--jlpt-indigo-light) 100%);
  box-shadow: 0 2px 16px rgba(0, 0, 0, 0.15);
}

.navbar-jlpt .navbar-brand {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.02em;
}

.navbar-jlpt .nav-link {
  font-weight: 500;
  opacity: 0.9;
  transition: opacity 0.2s;
}

.navbar-jlpt .nav-link:hover,
.navbar-jlpt .nav-link.active {
  opacity: 1;
}

/* Hero */
.hero-section {
  background: linear-gradient(160deg, var(--jlpt-indigo) 0%, #2d3748 50%, var(--jlpt-indigo-light) 100%);
  color: #fff;
  padding: 5rem 0 4rem;
  position: relative;
  overflow: hidden;
}

.hero-section::before {
  content: "学";
  position: absolute;
  right: 5%;
  top: 50%;
  transform: translateY(-50%);
  font-size: clamp(8rem, 20vw, 16rem);
  opacity: 0.06;
  font-family: var(--font-display);
  pointer-events: none;
}

.hero-badge {
  background: rgba(255, 255, 255, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.25);
  backdrop-filter: blur(8px);
}

/* Feature cards */
.feature-card {
  border: none;
  border-radius: var(--jlpt-radius);
  box-shadow: var(--jlpt-card-shadow);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  height: 100%;
  overflow: hidden;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(30, 58, 95, 0.14);
}

.feature-card .card-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}

.icon-kanji { background: #ebf8ff; color: #2b6cb0; }
.icon-game { background: #fef3c7; color: #b7791f; }
.icon-test { background: #fed7d7; color: var(--jlpt-vermillion); }

/* Buttons */
.btn-jlpt-primary {
  background: var(--jlpt-vermillion);
  border-color: var(--jlpt-vermillion);
  color: #fff;
  font-weight: 600;
  padding: 0.6rem 1.4rem;
  border-radius: 8px;
}

.btn-jlpt-primary:hover {
  background: #9b2c2c;
  border-color: #9b2c2c;
  color: #fff;
}

.btn-jlpt-outline {
  border: 2px solid var(--jlpt-indigo);
  color: var(--jlpt-indigo);
  font-weight: 600;
  border-radius: 8px;
}

.btn-jlpt-outline:hover {
  background: var(--jlpt-indigo);
  color: #fff;
}

/* Kanji study */
.kanji-display {
  font-size: clamp(5rem, 18vw, 9rem);
  line-height: 1;
  font-family: "Noto Serif JP", serif;
  color: var(--jlpt-indigo);
  text-shadow: 2px 2px 0 rgba(214, 158, 46, 0.2);
}

.kanji-card-panel {
  background: #fff;
  border-radius: var(--jlpt-radius);
  box-shadow: var(--jlpt-card-shadow);
  padding: 2rem;
}

.reading-pill {
  display: inline-block;
  background: #edf2f7;
  padding: 0.35rem 1rem;
  border-radius: 999px;
  font-size: 1.1rem;
  margin: 0.25rem;
}

.example-box {
  border-left: 4px solid var(--jlpt-gold);
  background: #fffbeb;
  padding: 1rem 1.25rem;
  border-radius: 0 8px 8px 0;
  margin-top: 1rem;
}

.progress-kanji {
  height: 6px;
  border-radius: 3px;
}

/* Game */
.game-canvas-wrap {
  position: relative;
  background: linear-gradient(180deg, #1a365d 0%, #2c5282 100%);
  border-radius: var(--jlpt-radius);
  overflow: hidden;
  min-height: 420px;
}

#gameCanvas {
  display: block;
  width: 100%;
  cursor: crosshair;
}

.game-hud {
  background: rgba(255, 255, 255, 0.95);
  border-radius: var(--jlpt-radius);
  padding: 1rem 1.25rem;
}

.level-btn.active {
  background: var(--jlpt-indigo);
  color: #fff;
  border-color: var(--jlpt-indigo);
}

/* Test */
.test-sidebar {
  background: #fff;
  border-radius: var(--jlpt-radius);
  box-shadow: var(--jlpt-card-shadow);
  max-height: calc(100vh - 120px);
  overflow-y: auto;
  position: sticky;
  top: 90px;
}

.test-timer {
  font-variant-numeric: tabular-nums;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--jlpt-vermillion);
}

.question-panel {
  background: #fff;
  border-radius: var(--jlpt-radius);
  box-shadow: var(--jlpt-card-shadow);
  padding: 1.75rem;
}

.passage-block {
  background: #f7fafc;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  padding: 1.25rem;
  font-size: 0.95rem;
  line-height: 1.8;
  max-height: 320px;
  overflow-y: auto;
}

.choice-btn {
  text-align: left;
  padding: 0.85rem 1.1rem;
  border: 2px solid #e2e8f0;
  border-radius: 8px;
  background: #fff;
  width: 100%;
  margin-bottom: 0.5rem;
  transition: all 0.15s;
}

.choice-btn:hover {
  border-color: var(--jlpt-indigo-light);
  background: #ebf8ff;
}

.choice-btn.selected {
  border-color: var(--jlpt-indigo);
  background: #bee3f8;
}

.choice-btn.correct {
  border-color: #38a169;
  background: #c6f6d5;
}

.choice-btn.incorrect {
  border-color: #e53e3e;
  background: #fed7d7;
}

.section-nav-item {
  font-size: 0.8rem;
  padding: 0.35rem 0.5rem;
}

.section-nav-item.answered {
  background: #c6f6d5 !important;
}

.results-dashboard {
  background: linear-gradient(135deg, #fff 0%, #f7fafc 100%);
  border: 2px solid var(--jlpt-indigo);
  border-radius: var(--jlpt-radius);
}

.footer-jlpt {
  background: var(--jlpt-indigo);
  color: rgba(255, 255, 255, 0.85);
  padding: 2rem 0;
  margin-top: 4rem;
}

@media (max-width: 768px) {
  .test-sidebar {
    position: static;
    max-height: none;
    margin-bottom: 1rem;
  }
}