/* ═══════════════════════════════════════════════════════════
   NIHONGO KISO — Lesson CSS
   Version: 1.0.0
   ═══════════════════════════════════════════════════════════ */

/* ─── Variables ─── */
.nk-wrap {
  --bg: #0c0e14;
  --surface: #14171f;
  --card: #1a1e2a;
  --card-hover: #222738;
  --border: rgba(255,255,255,0.06);
  --primary: #6c5ce7;
  --primary-soft: rgba(108,92,231,0.15);
  --accent: #00cec9;
  --accent-soft: rgba(0,206,201,0.12);
  --gold: #fdcb6e;
  --success: #00b894;
  --danger: #e17055;
  --warning: #f39c12;
  --text: #eef0f6;
  --text-dim: #8892b0;
  --text-muted: #5a6380;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 8px 32px rgba(0,0,0,0.3);

  font-family: 'Outfit', 'Noto Sans JP', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  max-width: 900px;
  margin: 0 auto;
  padding: 20px;
  min-height: 100vh;
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
.nk-wrap * { box-sizing: border-box; }

/* ─── Typography ─── */
.nk-wrap h1, .nk-wrap h2, .nk-wrap h3, .nk-wrap h4 {
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  line-height: 1.3;
  margin: 0 0 12px;
}
.nk-wrap p { margin: 0 0 14px; }

/* ─── Japanese Fonts ─── */
.nk-jp {
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 600;
}
.nk-jp-large {
  font-family: 'Noto Sans JP', sans-serif;
  font-size: 28px;
  font-weight: 700;
  line-height: 1.5;
}

/* ─── Furigana ─── */
.nk-wrap ruby {
  ruby-align: center;
}
.nk-wrap ruby rt {
  font-size: 0.55em;
  color: var(--text-dim);
  font-weight: 400;
}

/* ─── Loading ─── */
.nk-loading {
  text-align: center;
  padding: 80px 20px;
  font-size: 20px;
  color: var(--text-dim);
  animation: nk-pulse 1.5s ease infinite;
}
@keyframes nk-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* ═══════════════════════════════════════════════════════════
   INDEX — Chapter Grid
   ═══════════════════════════════════════════════════════════ */

.nk-index-header {
  text-align: center;
  padding: 40px 20px 30px;
}
.nk-logo { font-size: 48px; margin-bottom: 8px; }
.nk-title {
  font-size: 36px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent), var(--primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.nk-subtitle {
  font-size: 16px;
  color: var(--text-dim);
  margin: 4px 0;
}
.nk-tagline {
  font-size: 13px;
  color: var(--text-muted);
  letter-spacing: 1px;
  text-transform: uppercase;
}

.nk-chapter-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 14px;
  padding: 10px 0 40px;
}

.nk-chapter-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--text);
  transition: all 0.3s ease;
}
.nk-chapter-card:hover { background: var(--card-hover); transform: translateY(-2px); box-shadow: var(--shadow); }
.nk-chapter-card.nk-locked { opacity: 0.4; pointer-events: none; }
.nk-chapter-card.nk-completed { border-color: var(--success); }
.nk-chapter-card.nk-inprogress { border-color: var(--gold); }

.nk-ch-num { font-size: 12px; color: var(--accent); font-weight: 700; letter-spacing: 1px; text-transform: uppercase; }
.nk-ch-title { font-size: 18px; font-weight: 700; }
.nk-ch-sub { font-size: 14px; color: var(--text-dim); font-family: 'Noto Sans JP', sans-serif; }
.nk-ch-status { font-size: 12px; color: var(--text-muted); margin-top: 6px; }

/* ═══════════════════════════════════════════════════════════
   CHAPTER VIEW — Top Bar & Navigation
   ═══════════════════════════════════════════════════════════ */

.nk-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--border);
}
.nk-topbar-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}
.nk-topbar-btn {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  cursor: pointer;
  font-size: 16px;
  transition: all 0.2s;
  color: var(--text);
  padding: 0;
}
.nk-topbar-btn svg { display: block; }
.nk-topbar-btn:hover { border-color: var(--primary); background: var(--card-hover); color: var(--primary); }
.nk-back-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-dim);
  padding: 8px 16px;
  border-radius: 20px;
  cursor: pointer;
  font-size: 14px;
  font-family: inherit;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.nk-back-btn svg { display: inline-block; vertical-align: middle; }
.nk-back-btn:hover { background: var(--card); color: var(--text); border-color: var(--primary); }
.nk-topbar-title {
  font-size: 14px;
  color: var(--text-dim);
  text-align: center;
  flex: 1;
}
.nk-topbar-step {
  font-size: 12px;
  color: var(--accent);
  font-weight: 700;
  background: var(--accent-soft);
  padding: 6px 14px;
  border-radius: 20px;
}

/* ─── Step Progress Bar ─── */
.nk-step-bar {
  display: flex;
  gap: 6px;
  margin-bottom: 28px;
}
.nk-step-dot {
  flex: 1;
  height: 6px;
  border-radius: 3px;
  background: var(--card);
  transition: background 0.4s ease, transform 0.2s ease, height 0.2s ease;
}
.nk-step-dot.active { background: var(--accent); }
.nk-step-dot.done { background: var(--success); }
.nk-step-dot[data-step-jump]:hover {
  transform: scaleY(1.6);
  background: var(--primary);
  box-shadow: 0 0 8px var(--primary);
}

/* ═══════════════════════════════════════════════════════════
   STEP 1: Warmup / Intro
   ═══════════════════════════════════════════════════════════ */

.nk-step { animation: nk-fadeIn 0.4s ease; }
@keyframes nk-fadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

.nk-warmup-card {
  background: linear-gradient(145deg, #1a2040, #1e2a4a);
  border: 1px solid rgba(108,92,231,0.2);
  border-radius: var(--radius);
  padding: 32px;
  text-align: center;
  margin-bottom: 24px;
}
.nk-warmup-emoji { font-size: 56px; margin-bottom: 12px; }
.nk-warmup-title { font-size: 28px; font-weight: 800; margin-bottom: 4px; }

/* Banner image */
.nk-banner-img {
  width: 100%;
  max-height: 280px;
  object-fit: cover;
  border-radius: 12px;
  margin-bottom: 20px;
  display: block;
}
.nk-warmup-sub { font-size: 18px; color: var(--text-dim); font-family: 'Noto Sans JP', sans-serif; margin-bottom: 20px; }
.nk-warmup-story {
  background: var(--accent-soft);
  border-left: 4px solid var(--accent);
  border-radius: 8px;
  padding: 16px 20px;
  text-align: left;
  color: var(--text);
  font-size: 15px;
  line-height: 1.8;
  margin: 20px 0;
}

.nk-objectives {
  text-align: left;
  margin: 20px 0;
}
.nk-objectives h3 { color: var(--accent); font-size: 16px; margin-bottom: 10px; }
.nk-obj-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 8px 0;
  font-size: 15px;
  color: var(--text-dim);
}
.nk-obj-check { color: var(--success); font-size: 16px; flex-shrink: 0; }

/* ═══════════════════════════════════════════════════════════
   STEP 2: Vocabulary
   ═══════════════════════════════════════════════════════════ */

.nk-vocab-header {
  text-align: center;
  margin-bottom: 20px;
}
.nk-vocab-header h2 { font-size: 24px; }
.nk-vocab-count {
  display: inline-block;
  background: var(--primary-soft);
  color: var(--primary);
  padding: 4px 16px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 700;
}

.nk-vocab-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 24px;
}
.nk-vocab-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 18px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s;
}
.nk-vocab-item:hover { background: var(--card-hover); border-color: var(--primary); }
.nk-vocab-item.expanded { background: var(--card-hover); border-color: var(--accent); }
.nk-vocab-num {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary-soft);
  color: var(--primary);
  border-radius: 50%;
  font-size: 12px;
  font-weight: 700;
  flex-shrink: 0;
}
.nk-vocab-jp {
  font-family: 'Noto Sans JP', sans-serif;
  font-size: 20px;
  font-weight: 700;
  min-width: 100px;
}
.nk-vocab-reading {
  font-size: 12px;
  color: var(--text-muted);
}
.nk-vocab-arti {
  flex: 1;
  font-size: 15px;
  color: var(--text-dim);
}
.nk-vocab-cat {
  font-size: 11px;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 2px 10px;
  border-radius: 10px;
  white-space: nowrap;
}
.nk-vocab-notes {
  display: none;
  padding: 10px 18px 14px 56px;
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
  background: var(--card-hover);
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  margin-top: -8px;
  border: 1px solid var(--border);
  border-top: none;
}
.nk-vocab-item.expanded + .nk-vocab-notes { display: block; }

/* ═══════════════════════════════════════════════════════════
   STEP 3: Patterns / Lesson
   ═══════════════════════════════════════════════════════════ */

.nk-pattern-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 24px;
  overflow: hidden;
}
.nk-pattern-header {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 20px 24px;
  background: linear-gradient(135deg, var(--primary-soft), transparent);
  border-bottom: 1px solid var(--border);
  cursor: pointer;
}
.nk-pattern-num {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary);
  color: #fff;
  border-radius: 50%;
  font-size: 16px;
  font-weight: 800;
  flex-shrink: 0;
}
.nk-pattern-bunkei {
  font-family: 'Noto Sans JP', sans-serif;
  font-size: 22px;
  font-weight: 700;
  flex: 1;
}
.nk-pattern-toggle {
  color: var(--text-dim);
  font-size: 20px;
  transition: transform 0.3s;
}
.nk-pattern-card.open .nk-pattern-toggle { transform: rotate(180deg); }

.nk-pattern-badge {
  background: linear-gradient(135deg, #ff7675, #fdcb6e);
  color: white;
  padding: 6px 12px;
  border-radius: 14px;
  font-size: 12px;
  font-weight: 700;
  white-space: nowrap;
  box-shadow: 0 2px 6px rgba(255, 118, 117, 0.3);
  flex-shrink: 0;
}

/* ─── Extra Quiz (Drill Konjugasi, dll) ─── */
.nk-extra-quiz {
  background: linear-gradient(135deg, rgba(108, 92, 231, 0.06), rgba(0, 184, 148, 0.04));
  border: 2px solid var(--primary-soft);
  border-radius: 14px;
  padding: 20px;
  margin-top: 16px;
}
.nk-extra-header {
  text-align: center;
  margin-bottom: 18px;
  padding-bottom: 14px;
  border-bottom: 1px dashed var(--border);
}
.nk-extra-header h3 {
  color: var(--primary);
  margin: 0 0 6px;
  font-size: 20px;
}
.nk-extra-header p {
  color: var(--text-dim);
  font-size: 13px;
  margin: 0;
  line-height: 1.5;
}
.nk-extra-result {
  text-align: center;
  padding: 30px 16px;
}
.nk-extra-score {
  font-size: 48px;
  font-weight: 800;
  color: var(--primary);
  line-height: 1;
}
.nk-extra-pct {
  font-size: 24px;
  font-weight: 700;
  color: var(--accent);
  margin: 6px 0 14px;
}
.nk-extra-msg {
  color: var(--text);
  font-size: 15px;
  margin-bottom: 20px;
}

/* ─── Mini Quiz per Pattern ─── */
.nk-mini-quiz {
  margin-top: 20px;
  padding: 20px;
  background: linear-gradient(135deg, rgba(255, 118, 117, 0.08), rgba(253, 203, 110, 0.05));
  border: 2px solid var(--primary-soft);
  border-radius: 14px;
}
.nk-mini-quiz h4 {
  margin: 0 0 14px;
  color: var(--primary);
  font-size: 16px;
}
.nk-mini-bar {
  height: 5px;
  background: var(--card);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 14px;
}
.nk-mini-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transition: width 0.4s ease;
}
.nk-mini-q {
  font-size: 16px;
  line-height: 1.7;
  margin-bottom: 14px;
  color: var(--text);
  padding: 12px;
  background: var(--card);
  border-radius: 8px;
}
.nk-mini-options {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.nk-mini-opt {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: var(--card);
  border: 2px solid var(--border);
  border-radius: 10px;
  cursor: pointer;
  text-align: left;
  font-family: inherit;
  font-size: 14px;
  color: var(--text);
  transition: all 0.2s;
}
.nk-mini-opt:hover:not(.disabled) {
  border-color: var(--primary);
  background: var(--card-hover);
  transform: translateX(2px);
}
.nk-mini-opt.disabled { cursor: not-allowed; opacity: 0.85; }
.nk-mini-opt.correct {
  border-color: var(--success);
  background: rgba(40, 167, 69, 0.15);
}
.nk-mini-opt.wrong {
  border-color: var(--danger, #dc3545);
  background: rgba(220, 53, 69, 0.15);
}
.nk-mini-exp {
  margin-top: 12px;
  padding: 12px;
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
  border-radius: 6px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--text);
}
.nk-mini-quiz-done {
  text-align: center;
}
.nk-mini-result { padding: 16px 0; }
.nk-mini-score {
  font-size: 36px;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 6px;
}
.nk-mini-msg {
  color: var(--text-dim);
  margin-bottom: 16px;
  font-size: 14px;
}

.nk-pattern-body {
  padding: 24px;
  display: none;
}
.nk-pattern-card.open .nk-pattern-body { display: block; }

/* Explanation content */
.nk-pattern-body h4 { font-size: 18px; color: var(--accent); margin-bottom: 12px; }
.nk-pattern-body h5 { font-size: 14px; color: var(--text-dim); margin: 16px 0 8px; }
.nk-pattern-body p { font-size: 15px; line-height: 1.8; color: var(--text); }
.nk-pattern-body ol, .nk-pattern-body ul { padding-left: 20px; margin: 8px 0; }
.nk-pattern-body li { margin: 4px 0; font-size: 15px; }

/* Component box */
.nk-component-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px;
  margin: 16px 0;
}
.nk-structure-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}
.nk-structure-table th {
  background: var(--primary-soft);
  color: var(--primary);
  padding: 10px 12px;
  text-align: center;
  font-family: 'Noto Sans JP', sans-serif;
  font-size: 18px;
  font-weight: 700;
}
.nk-structure-table td {
  padding: 8px 12px;
  text-align: center;
  color: var(--text-dim);
  border-top: 1px solid var(--border);
}

/* Note boxes */
.nk-note-box {
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  margin: 16px 0;
  font-size: 14px;
  line-height: 1.7;
}
.nk-note-warning {
  background: rgba(225,112,85,0.08);
  border-left: 4px solid var(--danger);
}
.nk-note-tip {
  background: rgba(0,206,201,0.08);
  border-left: 4px solid var(--accent);
}
.nk-note-compare {
  background: rgba(108,92,231,0.08);
  border-left: 4px solid var(--primary);
}

/* Examples */
.nk-examples-section {
  margin-top: 20px;
}
.nk-examples-section h4 { font-size: 16px; color: var(--gold); }
.nk-example-item {
  padding: 14px 18px;
  background: var(--surface);
  border-radius: var(--radius-sm);
  margin: 8px 0;
  border-left: 3px solid var(--accent);
}
.nk-ex-jp {
  font-family: 'Noto Sans JP', sans-serif;
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
  line-height: 1.6;
}
.nk-ex-reading {
  font-size: 13px;
  color: var(--text-muted);
  font-style: italic;
  margin: 2px 0;
}
.nk-ex-arti {
  font-size: 15px;
  color: var(--accent);
  margin-top: 4px;
}

/* ═══════════════════════════════════════════════════════════
   STEP 4: Drills
   ═══════════════════════════════════════════════════════════ */

.nk-drill-header {
  text-align: center;
  margin-bottom: 24px;
}
.nk-drill-progress {
  font-size: 14px;
  color: var(--text-dim);
  margin-bottom: 8px;
}
.nk-drill-bar {
  height: 6px;
  background: var(--card);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 20px;
}
.nk-drill-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--primary));
  border-radius: 3px;
  transition: width 0.4s ease;
}

.nk-drill-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  margin-bottom: 20px;
}
.nk-drill-type {
  font-size: 12px;
  color: var(--primary);
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 8px;
}
.nk-drill-question {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 20px;
  line-height: 1.6;
  font-family: 'Noto Sans JP', 'Outfit', sans-serif;
}
.nk-drill-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.nk-drill-option {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s;
  font-size: 16px;
  font-family: 'Noto Sans JP', 'Outfit', sans-serif;
  color: var(--text);
  text-align: left;
  width: 100%;
}
.nk-drill-option:hover { border-color: var(--primary); background: var(--primary-soft); }
.nk-drill-option.correct { border-color: var(--success); background: rgba(0,184,148,0.12); }
.nk-drill-option.wrong { border-color: var(--danger); background: rgba(225,112,85,0.12); }
.nk-drill-option.disabled { pointer-events: none; opacity: 0.6; }

.nk-drill-label {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--card);
  border-radius: 50%;
  font-size: 13px;
  font-weight: 700;
  color: var(--text-dim);
  flex-shrink: 0;
}

.nk-drill-explanation {
  margin-top: 16px;
  padding: 16px 20px;
  background: var(--accent-soft);
  border-left: 4px solid var(--accent);
  border-radius: 8px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text);
  animation: nk-fadeIn 0.3s ease;
}

.nk-drill-result {
  text-align: center;
  padding: 40px 20px;
}
.nk-drill-score {
  font-size: 48px;
  font-weight: 800;
  color: var(--accent);
}
.nk-drill-msg {
  font-size: 18px;
  color: var(--text-dim);
  margin: 12px 0;
}

/* ═══════════════════════════════════════════════════════════
   STEP 5: Kaiwa
   ═══════════════════════════════════════════════════════════ */

.nk-kaiwa-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 24px;
  overflow: hidden;
}
.nk-kaiwa-header {
  padding: 20px 24px;
  background: linear-gradient(135deg, rgba(0,206,201,0.08), transparent);
  border-bottom: 1px solid var(--border);
}
.nk-kaiwa-title { font-size: 18px; font-weight: 700; }
.nk-kaiwa-situation {
  font-size: 14px;
  color: var(--text-dim);
  margin-top: 6px;
  line-height: 1.6;
}

.nk-kaiwa-body { padding: 20px 24px; }

.nk-kaiwa-line {
  display: flex;
  gap: 14px;
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
}
.nk-kaiwa-line:last-child { border-bottom: none; }

.nk-kaiwa-speaker {
  width: 60px;
  text-align: center;
  flex-shrink: 0;
}
.nk-kaiwa-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  margin: 0 auto 4px;
  background: var(--card);
  border: 2px solid var(--border);
}
.nk-kaiwa-avatar-img {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 4px;
  display: block;
  border: 2px solid var(--accent);
  box-shadow: 0 2px 8px rgba(0,206,201,0.15);
}

/* Kaiwa scene illustration */
.nk-kaiwa-scene {
  width: 100%;
  max-height: 240px;
  object-fit: cover;
  border-radius: 12px 12px 0 0;
  display: block;
  margin-bottom: 16px;
}

/* Culture illustration */
.nk-culture-img {
  width: 100%;
  max-height: 300px;
  object-fit: contain;
  border-radius: 10px;
  margin: 12px 0;
  display: block;
}
.nk-kaiwa-name {
  font-size: 11px;
  color: var(--text-muted);
  font-family: 'Noto Sans JP', sans-serif;
}

.nk-kaiwa-content { flex: 1; }
.nk-kaiwa-jp {
  font-family: 'Noto Sans JP', sans-serif;
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
  line-height: 1.6;
}
.nk-kaiwa-reading-text {
  font-size: 12px;
  color: var(--text-muted);
  font-style: italic;
  margin: 2px 0;
}
.nk-kaiwa-arti-text {
  font-size: 14px;
  color: var(--accent);
}
.nk-kaiwa-audio-btn {
  background: var(--primary-soft);
  border: 1px solid var(--primary);
  color: var(--primary);
  padding: 4px 12px;
  border-radius: 16px;
  cursor: pointer;
  font-size: 12px;
  margin-top: 6px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.nk-culture-box {
  margin-top: 20px;
  padding: 20px;
  background: rgba(253,203,110,0.06);
  border-left: 4px solid var(--gold);
  border-radius: 8px;
}
.nk-culture-box h4 { color: var(--gold); font-size: 15px; margin-bottom: 10px; }
.nk-culture-box p { font-size: 14px; line-height: 1.7; color: var(--text-dim); }

/* ═══════════════════════════════════════════════════════════
   STEP 6: Final Test
   ═══════════════════════════════════════════════════════════ */

.nk-test-header {
  text-align: center;
  margin-bottom: 24px;
}
.nk-test-badge {
  display: inline-block;
  background: linear-gradient(135deg, var(--danger), #c0392b);
  color: #fff;
  padding: 6px 20px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 1px;
}

/* ═══════════════════════════════════════════════════════════
   STEP 7: Complete
   ═══════════════════════════════════════════════════════════ */

.nk-complete {
  text-align: center;
  padding: 40px 20px;
}
.nk-complete-emoji { font-size: 64px; margin-bottom: 16px; }
.nk-complete-title { font-size: 32px; font-weight: 800; color: var(--success); }
.nk-complete-msg { font-size: 16px; color: var(--text-dim); margin: 12px 0 24px; }
.nk-complete-score {
  display: inline-block;
  background: var(--card);
  border: 2px solid var(--success);
  padding: 16px 32px;
  border-radius: var(--radius);
  font-size: 24px;
  font-weight: 800;
  color: var(--success);
  margin: 16px 0;
}
.nk-complete-summary {
  text-align: left;
  max-width: 400px;
  margin: 20px auto;
}
.nk-summary-item {
  display: flex;
  justify-content: space-between;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
}

/* ═══════════════════════════════════════════════════════════
   BUTTONS
   ═══════════════════════════════════════════════════════════ */

.nk-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 12px;
  font-size: 16px;
  font-weight: 700;
  font-family: inherit;
  cursor: pointer;
  border: none;
  transition: all 0.25s ease;
}
.nk-btn-primary {
  background: linear-gradient(135deg, var(--primary), #5a4bd1);
  color: #fff;
  box-shadow: 0 4px 16px rgba(108,92,231,0.3);
}
.nk-btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 24px rgba(108,92,231,0.4); }
.nk-btn-accent {
  background: linear-gradient(135deg, var(--accent), #00a8a5);
  color: #fff;
  box-shadow: 0 4px 16px rgba(0,206,201,0.3);
}
.nk-btn-ghost {
  background: transparent;
  border: 2px solid var(--border);
  color: var(--text-dim);
}
.nk-btn-ghost:hover { border-color: var(--primary); color: var(--text); }

.nk-btn-row {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-top: 24px;
  flex-wrap: wrap;
}
.nk-step-nav {
  margin-top: 32px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

/* ═══════════════════════════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════════════════════════ */

@media (max-width: 600px) {
  .nk-wrap { padding: 12px; font-size: 15px; }
  .nk-title { font-size: 28px; }
  .nk-warmup-title { font-size: 22px; }
  .nk-warmup-card { padding: 24px 18px; }
  .nk-pattern-bunkei { font-size: 18px; }
  .nk-pattern-body { padding: 18px; }
  .nk-ex-jp { font-size: 17px; }
  .nk-drill-card { padding: 20px; }
  .nk-drill-question { font-size: 16px; }
  .nk-drill-option { padding: 12px 14px; font-size: 14px; }
  .nk-kaiwa-jp { font-size: 16px; }
  .nk-chapter-grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 10px; }
  .nk-vocab-jp { font-size: 17px; min-width: 80px; }
  .nk-vocab-arti { font-size: 13px; }
  .nk-jp-large { font-size: 22px; }
  .nk-complete-title { font-size: 24px; }
  .nk-btn { padding: 12px 22px; font-size: 14px; }
  .nk-structure-table th { font-size: 15px; padding: 8px; }
  .nk-structure-table td { font-size: 12px; padding: 6px; }
}

/* ═══════════════════════════════════════════════════════════
   FLASHCARD
   ═══════════════════════════════════════════════════════════ */

.nk-fc-wrap { text-align: center; max-width: 400px; margin: 0 auto; }
.nk-fc-progress { font-size: 14px; color: var(--text-dim); margin-bottom: 16px; }

/* 3D Flip Card */
.nk-fc-card {
  perspective: 1200px;
  -webkit-perspective: 1200px;
  cursor: pointer;
  height: 280px;
  margin-bottom: 20px;
  user-select: none;
  -webkit-user-select: none;
}
.nk-fc-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
  transform-style: preserve-3d;
  -webkit-transform-style: preserve-3d;
  will-change: transform;
}
.nk-fc-card.flipped .nk-fc-inner {
  transform: rotateY(180deg);
  -webkit-transform: rotateY(180deg);
}
.nk-fc-front, .nk-fc-back {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px 18px;
  border-radius: var(--radius);
  border: 2px solid var(--border);
  background: var(--card);
  box-sizing: border-box;
  overflow: hidden;
}
.nk-fc-back {
  transform: rotateY(180deg);
  -webkit-transform: rotateY(180deg);
  border-color: var(--accent);
  background: var(--card-hover);
}
.nk-fc-jp { font-family: 'Noto Sans JP', sans-serif; font-size: 36px; font-weight: 700; margin: 0 0 8px; line-height: 1.2; }
.nk-fc-reading { font-size: 14px; color: var(--text-muted); margin: 0; }
.nk-fc-hint { font-size: 13px; color: var(--text-muted); margin-top: 18px; }
.nk-fc-arti { font-size: 22px; color: var(--accent); font-weight: 700; margin: 10px 0; line-height: 1.3; }
.nk-fc-cat { font-size: 11px; color: var(--primary); background: var(--primary-soft); display: inline-block; padding: 3px 10px; border-radius: 10px; margin-top: 4px; }
.nk-fc-notes { font-size: 12px; color: var(--text-muted); margin-top: 10px; line-height: 1.4; padding: 0 8px; }

/* ═══════════════════════════════════════════════════════════
   DRILL TABS
   ═══════════════════════════════════════════════════════════ */

.nk-drill-tabs {
  display: flex;
  gap: 6px;
  margin-bottom: 20px;
  overflow-x: auto;
  padding-bottom: 4px;
}
.nk-drill-tab {
  padding: 8px 16px;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text-dim);
  font-size: 13px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s;
}
.nk-drill-tab:hover { border-color: var(--primary); color: var(--text); }
.nk-drill-tab.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

/* ═══════════════════════════════════════════════════════════
   SENTENCE BUILD
   ═══════════════════════════════════════════════════════════ */

.nk-build-result {
  min-height: 60px;
  background: var(--surface);
  border: 2px dashed var(--border);
  border-radius: var(--radius-sm);
  padding: 14px;
  margin: 16px 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}
.nk-build-placeholder { color: var(--text-muted); font-size: 14px; }
.nk-build-word {
  display: inline-block;
  padding: 6px 14px;
  background: var(--accent-soft);
  border: 1px solid var(--accent);
  border-radius: 8px;
  color: var(--text);
  font-family: 'Noto Sans JP', sans-serif;
  font-size: 16px;
  cursor: pointer;
}
.nk-build-options {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin: 12px 0;
}
.nk-build-word-btn {
  padding: 10px 18px;
  background: var(--card);
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: 'Noto Sans JP', sans-serif;
  font-size: 18px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}
.nk-build-word-btn:hover { border-color: var(--accent); background: var(--accent-soft); }
.nk-build-word-btn.used { opacity: 0.3; pointer-events: none; }

/* ═══════════════════════════════════════════════════════════
   TRANSLATE INPUT
   ═══════════════════════════════════════════════════════════ */

.nk-trans-input {
  width: 100%;
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px;
  font-size: 18px;
  font-family: 'Noto Sans JP', 'Outfit', sans-serif;
  color: var(--text);
  outline: none;
  resize: none;
  margin: 12px 0;
  transition: border-color 0.2s;
}
.nk-trans-input:focus { border-color: var(--accent); }
.nk-trans-input::placeholder { color: var(--text-muted); }

/* ═══════════════════════════════════════════════════════════
   MATCHING GAME
   ═══════════════════════════════════════════════════════════ */

.nk-match-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  max-width: 500px;
  margin: 0 auto;
}
.nk-match-card {
  padding: 16px 10px;
  background: var(--card);
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 14px;
  font-family: 'Noto Sans JP', 'Outfit', sans-serif;
  cursor: pointer;
  transition: all 0.2s;
  text-align: center;
  min-height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.nk-match-card:hover { border-color: var(--primary); }
.nk-match-card.selected { border-color: var(--accent); background: var(--accent-soft); box-shadow: 0 0 12px rgba(0,206,201,0.2); }
.nk-match-card.matched { border-color: var(--success); background: var(--success-soft); opacity: 0.6; pointer-events: none; }
.nk-match-card.wrong { border-color: var(--danger); background: rgba(225,112,85,0.12); animation: nk-shake 0.4s ease; }
@keyframes nk-shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-6px); }
  75% { transform: translateX(6px); }
}

@media (max-width: 600px) {
  .nk-match-grid { grid-template-columns: repeat(2, 1fr); gap: 8px; }
  .nk-match-card { padding: 12px 8px; font-size: 13px; min-height: 50px; }
  .nk-fc-jp { font-size: 28px; }
  .nk-fc-arti { font-size: 20px; }
  .nk-build-word-btn { padding: 8px 14px; font-size: 16px; }
  .nk-drill-tabs { gap: 4px; }
  .nk-drill-tab { padding: 6px 12px; font-size: 12px; }
}

/* ═══════════════════════════════════════════════════════════
   FULLSCREEN MODE (Real + Pseudo for iPhone)
   ═══════════════════════════════════════════════════════════ */

.nk-wrap.nk-fullscreen {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 999999;
  max-width: 100%;
  margin: 0;
  padding: 16px;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}
.nk-wrap.nk-fullscreen .nk-step {
  max-width: 900px;
  margin: 0 auto;
}

/* ═══════════════════════════════════════════════════════════
   LIGHT THEME
   ═══════════════════════════════════════════════════════════ */

.nk-wrap.nk-light {
  --bg: #f5f6fa;
  --surface: #ffffff;
  --card: #ffffff;
  --card-hover: #f0f2f8;
  --border: rgba(0,0,0,0.08);
  --primary: #6c5ce7;
  --primary-soft: rgba(108,92,231,0.08);
  --accent: #00a8a5;
  --accent-soft: rgba(0,168,165,0.08);
  --gold: #d4a017;
  --success: #00875a;
  --success-soft: rgba(0,135,90,0.08);
  --danger: #d63031;
  --text: #1a1a2e;
  --text-dim: #555770;
  --text-muted: #8e90a6;
  color: var(--text);
  background: var(--bg);
}

.nk-wrap.nk-light .nk-title {
  background: linear-gradient(135deg, var(--accent), var(--primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.nk-wrap.nk-light .nk-warmup-card {
  background: linear-gradient(145deg, #e8eaf6, #f5f6fa);
  border: 1px solid var(--border);
}
.nk-wrap.nk-light .nk-pattern-header {
  background: linear-gradient(135deg, rgba(108,92,231,0.06), transparent);
}
.nk-wrap.nk-light .nk-fc-front,
.nk-wrap.nk-light .nk-fc-back {
  background: var(--card);
  box-shadow: 0 2px 12px rgba(0,0,0,0.06);
}
.nk-wrap.nk-light .nk-drill-option {
  background: var(--card);
  border-color: rgba(0,0,0,0.1);
}
.nk-wrap.nk-light .nk-drill-option:hover {
  border-color: var(--primary);
  background: var(--primary-soft);
}
.nk-wrap.nk-light .nk-chapter-card {
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}
.nk-wrap.nk-light .nk-chapter-card:hover {
  box-shadow: 0 4px 16px rgba(0,0,0,0.08);
}
.nk-wrap.nk-light .nk-match-card {
  background: var(--card);
  box-shadow: 0 1px 4px rgba(0,0,0,0.05);
}
.nk-wrap.nk-light .nk-build-word-btn {
  background: var(--card);
  border-color: rgba(0,0,0,0.1);
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}
.nk-wrap.nk-light .nk-trans-input {
  background: var(--card);
  border-color: rgba(0,0,0,0.1);
}
.nk-wrap.nk-light .nk-note-warning {
  background: rgba(214,48,49,0.04);
}
.nk-wrap.nk-light .nk-note-tip {
  background: rgba(0,168,165,0.04);
}
.nk-wrap.nk-light .nk-note-compare {
  background: rgba(108,92,231,0.04);
}
.nk-wrap.nk-light .nk-warmup-story {
  background: rgba(0,168,165,0.06);
}
.nk-wrap.nk-light .nk-topbar-btn {
  background: var(--surface);
}

/* ═══════════════════════════════════════════════════════════
   PATTERN ABBREVIATION LEGEND
   ═══════════════════════════════════════════════════════════ */
.nk-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 10px;
  align-items: center;
  justify-content: center;
  padding: 14px 16px;
  background: var(--primary-soft);
  border: 1px solid rgba(108,92,231,0.2);
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
  font-size: 13px;
  color: var(--text-dim);
}
.nk-legend strong { color: var(--primary); font-size: 13px; }

.nk-legend-item {
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 6px 12px;
  border-radius: 18px;
  font-size: 13px;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.nk-legend-item:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}
.nk-legend-item.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.nk-legend-item b {
  color: var(--accent);
  font-weight: 800;
}
.nk-legend-item.active b {
  color: #fff;
}

/* Glossary explanation box */
.nk-glossary {
  position: relative;
  background: var(--card);
  border: 2px solid var(--accent);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin-bottom: 20px;
  animation: nk-fadeIn 0.3s ease;
}
.nk-glossary h4 {
  color: var(--accent);
  font-size: 16px;
  margin: 0 0 10px;
  padding-right: 28px;
}
.nk-glossary p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-dim);
  margin: 0 0 12px;
}
.nk-glossary code {
  background: var(--primary-soft);
  color: var(--primary);
  padding: 2px 8px;
  border-radius: 4px;
  font-family: 'Noto Sans JP', monospace;
  font-size: 13px;
}
.nk-glos-examples {
  background: var(--surface);
  padding: 12px 14px;
  border-radius: 8px;
  margin: 10px 0;
}
.nk-glos-examples strong {
  display: block;
  color: var(--gold);
  font-size: 13px;
  margin-bottom: 6px;
}
.nk-glos-ex {
  padding: 4px 0;
  font-size: 14px;
  line-height: 1.6;
}
.nk-glos-ex .nk-jp {
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 700;
  font-size: 16px;
  color: var(--text);
}
.nk-glos-ex small {
  color: var(--text-muted);
  font-size: 12px;
  font-style: italic;
}
.nk-glos-usage {
  font-size: 13px !important;
  background: var(--accent-soft);
  padding: 8px 12px;
  border-radius: 6px;
  margin-top: 8px !important;
}
.nk-glos-close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-dim);
  cursor: pointer;
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
}
.nk-glos-close:hover {
  background: var(--danger);
  color: #fff;
  border-color: var(--danger);
}

/* Light theme */
.nk-wrap.nk-light .nk-legend { background: rgba(108,92,231,0.06); }
.nk-wrap.nk-light .nk-legend-item { background: #fff; }

/* Mobile flashcard tweaks */
@media (max-width: 600px) {
  .nk-fc-card { height: 260px; }
  .nk-fc-jp { font-size: 28px; }
  .nk-fc-arti { font-size: 18px; }
  .nk-fc-reading { font-size: 13px; }
  .nk-fc-hint { font-size: 12px; margin-top: 14px; }
  .nk-fc-notes { font-size: 11px; }
  .nk-legend { font-size: 12px; padding: 10px 12px; gap: 6px 10px; }
}

/* ═══════════════════════════════════════════════════════════
   TRANSLATE — Self-Evaluate Compare View
   ═══════════════════════════════════════════════════════════ */
.nk-trans-compare {
  margin: 16px 0;
  background: var(--surface);
  border-radius: var(--radius-sm);
  padding: 16px;
}
.nk-trans-row {
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
}
.nk-trans-row:last-of-type { border-bottom: none; }
.nk-trans-label {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 6px;
}
.nk-trans-user {
  font-size: 17px;
  font-family: 'Noto Sans JP', 'Outfit', sans-serif;
  color: var(--text);
  padding: 10px 14px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  word-break: break-word;
}
.nk-trans-correct {
  font-size: 18px;
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 700;
  color: var(--success);
  padding: 10px 14px;
  background: var(--success-soft);
  border: 1px solid var(--success);
  border-radius: 8px;
  word-break: break-word;
}
.nk-trans-hint {
  margin-top: 12px;
  padding: 10px 14px;
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
  border-radius: 6px;
  font-size: 13px;
  color: var(--text-dim);
  line-height: 1.6;
}

.nk-trans-eval {
  margin-top: 20px;
  text-align: center;
}
.nk-trans-eval-q {
  font-size: 14px;
  color: var(--text-dim);
  margin-bottom: 14px;
  font-weight: 600;
}
.nk-btn-eval {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 14px;
  font-size: 16px;
  font-weight: 700;
  font-family: inherit;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all 0.2s;
}
.nk-btn-eval-correct {
  background: linear-gradient(135deg, var(--success), #00875a);
  color: #fff;
  box-shadow: 0 4px 14px rgba(0,184,148,0.3);
}
.nk-btn-eval-correct:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0,184,148,0.4);
}
.nk-btn-eval-wrong {
  background: var(--card);
  color: var(--danger);
  border-color: var(--danger);
}
.nk-btn-eval-wrong:hover {
  background: rgba(225,112,85,0.1);
}

@media (max-width: 600px) {
  .nk-btn-eval { padding: 12px 20px; font-size: 14px; }
  .nk-trans-user, .nk-trans-correct { font-size: 15px; padding: 8px 12px; }
}

/* ═══════════════════════════════════════════════════════════
   TEST REVIEW (Setelah selesai tes)
   ═══════════════════════════════════════════════════════════ */
.nk-review-wrap {
  text-align: left;
  margin-top: 24px;
  border-top: 2px solid var(--border);
  padding-top: 24px;
}
.nk-review-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-left-width: 4px;
  border-radius: var(--radius-sm);
  padding: 16px 18px;
  margin-bottom: 12px;
}
.nk-review-item.correct { border-left-color: var(--success); }
.nk-review-item.wrong { border-left-color: var(--danger); background: rgba(225,112,85,0.04); }

.nk-review-num {
  font-size: 12px;
  font-weight: 700;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 8px;
}
.nk-review-item.correct .nk-review-num { color: var(--success); }
.nk-review-item.wrong .nk-review-num { color: var(--danger); }

.nk-review-q {
  font-size: 15px;
  font-weight: 600;
  font-family: 'Noto Sans JP', 'Outfit', sans-serif;
  line-height: 1.6;
  color: var(--text);
  margin-bottom: 10px;
}
.nk-review-answers {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 8px;
}
.nk-review-opt {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  border-radius: 6px;
  font-size: 14px;
  font-family: 'Noto Sans JP', 'Outfit', sans-serif;
  color: var(--text-dim);
}
.nk-review-opt .nk-drill-label {
  width: 22px;
  height: 22px;
  font-size: 11px;
  background: var(--surface);
}
.nk-review-opt.is-correct {
  background: rgba(0,184,148,0.10);
  color: var(--success);
  font-weight: 700;
}
.nk-review-opt.is-correct .nk-drill-label { background: var(--success); color: #fff; }
.nk-review-opt.is-wrong {
  background: rgba(225,112,85,0.10);
  color: var(--danger);
  font-weight: 700;
  text-decoration: line-through;
}
.nk-review-opt.is-wrong .nk-drill-label { background: var(--danger); color: #fff; }

.nk-review-exp {
  margin-top: 8px;
  padding: 10px 12px;
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
  border-radius: 6px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-dim);
}

@media (max-width: 600px) {
  .nk-review-item { padding: 12px 14px; }
  .nk-review-q { font-size: 14px; }
  .nk-review-opt { font-size: 13px; padding: 5px 8px; }
}

/* ═══════════════════════════════════════════════════════════
   AUDIO BUTTON STYLES — Web Speech API
   ═══════════════════════════════════════════════════════════ */
.nk-audio-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  min-width: 28px;
  padding: 0;
  background: rgba(108, 92, 231, 0.12);
  border: 1px solid rgba(108, 92, 231, 0.3);
  border-radius: 50%;
  color: var(--primary);
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s ease;
  vertical-align: middle;
  flex-shrink: 0;
  margin-right: 4px;
  user-select: none;
}

.nk-audio-btn:hover {
  background: var(--primary);
  color: white;
  transform: scale(1.1);
  box-shadow: 0 2px 8px rgba(108, 92, 231, 0.4);
}

.nk-audio-btn:active {
  transform: scale(0.95);
}

.nk-audio-btn.playing {
  background: var(--primary);
  color: white;
  animation: nk-audio-pulse 1s infinite;
  box-shadow: 0 0 0 0 rgba(108, 92, 231, 0.7);
}

@keyframes nk-audio-pulse {
  0%, 100% {
    transform: scale(1);
    box-shadow: 0 0 0 0 rgba(108, 92, 231, 0.6);
  }
  50% {
    transform: scale(1.15);
    box-shadow: 0 0 0 8px rgba(108, 92, 231, 0);
  }
}

/* Audio glow effect on active cards */
.nk-audio-active {
  box-shadow: 0 0 16px rgba(108, 92, 231, 0.3) !important;
  border-color: var(--primary) !important;
  transition: all 0.3s ease;
}

/* ─── Vocab list audio button ─── */
.nk-vocab-audio {
  margin: 0 8px 0 0;
}

/* ─── Flashcard audio button (top-right of back card) ─── */
.nk-fc-audio {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 36px;
  height: 36px;
  min-width: 36px;
  font-size: 15px;
  background: rgba(255, 255, 255, 0.95);
  z-index: 10;
}

.nk-fc-back {
  position: relative;
}

/* ─── Example audio (inline before kalimat) ─── */
.nk-ex-audio,
.nk-example-item .nk-audio-btn {
  margin-right: 8px;
}

.nk-example-item {
  position: relative;
}

/* ─── Drill audio (in question) ─── */
.nk-drill-question .nk-audio-btn {
  margin-right: 6px;
}

.nk-drill-option .nk-audio-btn,
.nk-opt-audio {
  margin-left: 8px;
  width: 24px;
  height: 24px;
  min-width: 24px;
  font-size: 11px;
}

/* ─── Match game audio ─── */
.nk-match-audio {
  position: absolute;
  top: 4px;
  right: 4px;
  width: 22px;
  height: 22px;
  min-width: 22px;
  font-size: 10px;
}

.nk-match-card {
  position: relative;
}

/* ─── Kaiwa TTS audio button ─── */
.nk-kaiwa-tts {
  margin-right: 6px;
  width: 24px;
  height: 24px;
  min-width: 24px;
  font-size: 11px;
}

.nk-kaiwa-jp {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
}

/* ─── Review audio ─── */
.nk-review-q .nk-audio-btn,
.nk-review-opt .nk-audio-btn {
  margin-left: 6px;
  width: 22px;
  height: 22px;
  min-width: 22px;
  font-size: 10px;
}

/* ─── Translate correct answer audio ─── */
.nk-trans-correct .nk-audio-btn {
  margin-right: 6px;
}

/* ─── Build correct answer audio ─── */
.nk-drill-explanation .nk-audio-btn {
  margin: 0 4px;
}

/* Light mode adjustments */
.nk-wrap.nk-light .nk-audio-btn {
  background: rgba(108, 92, 231, 0.08);
  border-color: rgba(108, 92, 231, 0.25);
}

.nk-wrap.nk-light .nk-fc-audio {
  background: white;
  border-color: var(--primary);
}

/* Mobile adjustments */
@media (max-width: 600px) {
  .nk-audio-btn {
    width: 26px;
    height: 26px;
    min-width: 26px;
    font-size: 12px;
  }
  .nk-fc-audio {
    width: 32px;
    height: 32px;
    min-width: 32px;
    font-size: 13px;
    top: 10px;
    right: 10px;
  }
}