/* ═══════════════════════════════════════════════════════════
   NIHONGO KISO — THEME 6: SHINKANSEN NEO-GLASS & CYBERPUNK
   Tokyo Night, Frosted Glassmorphism & High-Tech Aesthetic
   ═══════════════════════════════════════════════════════════ */

/* ─── Base Variables & Typography ─── */
#nk-app.nk-theme-6,
.nk-wrap.nk-theme-6 {
  /* Tokyo Midnight Obsidian Glass (Signature Dark) */
  --bg: #070b14;
  --surface: rgba(15, 23, 42, 0.75);
  --card: rgba(19, 30, 54, 0.7);
  --card-hover: rgba(28, 44, 79, 0.8);
  --border: rgba(56, 189, 248, 0.2);
  --border-strong: rgba(56, 189, 248, 0.45);
  --primary: #06b6d4;           /* Luminous Cyan */
  --primary-hover: #22d3ee;
  --primary-soft: rgba(6, 182, 212, 0.15);
  --primary-glow: rgba(6, 182, 212, 0.4);
  --accent: #8b5cf6;            /* Neon Violet */
  --accent-soft: rgba(139, 92, 246, 0.16);
  --gold: #f59e0b;
  --gold-soft: rgba(245, 158, 11, 0.2);
  --success: #10b981;
  --danger: #f43f5e;
  --warning: #f59e0b;
  --text: #f8fafc;              /* Crisp Starlight White */
  --text-dim: #94a3b8;
  --text-muted: #64748b;
  --radius: 16px;
  --radius-sm: 10px;
  --radius-pill: 9999px;
  --shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 12px 40px 0 rgba(6, 182, 212, 0.2);

  font-family: 'Space Grotesk', 'Outfit', 'Noto Sans JP', sans-serif;
  background-color: var(--bg);
  background-image: 
    radial-gradient(ellipse 60% 50% at 50% -20%, rgba(6, 182, 212, 0.15), transparent),
    radial-gradient(ellipse 50% 40% at 100% 100%, rgba(139, 92, 246, 0.12), transparent);
  color: var(--text);
  border-radius: 20px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  position: relative;
  overflow: hidden;
}

/* ─── Light Mode (Neo-Tokyo Frost Light) ─── */
#nk-app.nk-theme-6.nk-light,
.nk-wrap.nk-theme-6.nk-light {
  --bg: #f0f7ff;
  --surface: rgba(255, 255, 255, 0.85);
  --card: rgba(255, 255, 255, 0.9);
  --card-hover: #ffffff;
  --border: rgba(6, 182, 212, 0.35);
  --border-strong: #06b6d4;
  --primary: #0891b2;
  --primary-hover: #0e7490;
  --primary-soft: rgba(6, 182, 212, 0.1);
  --primary-glow: rgba(6, 182, 212, 0.25);
  --accent: #7c3aed;
  --accent-soft: rgba(124, 58, 237, 0.1);
  --text: #0f172a;
  --text-dim: #475569;
  --text-muted: #94a3b8;
  --shadow: 0 8px 30px rgba(6, 182, 212, 0.08);

  background-color: var(--bg);
  background-image: 
    radial-gradient(ellipse 60% 50% at 50% -20%, rgba(6, 182, 212, 0.1), transparent),
    radial-gradient(ellipse 50% 40% at 100% 100%, rgba(139, 92, 246, 0.08), transparent);
}

/* ─── Typography & Japanese Fonts ─── */
#nk-app.nk-theme-6 h1,
#nk-app.nk-theme-6 h2,
#nk-app.nk-theme-6 h3,
#nk-app.nk-theme-6 h4 {
  font-family: 'Space Grotesk', 'Outfit', sans-serif;
  letter-spacing: -0.02em;
  color: var(--text) !important;
}

#nk-app.nk-theme-6 .nk-jp,
#nk-app.nk-theme-6 .nk-jp-large {
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 700;
}

#nk-app.nk-theme-6 ruby rt {
  color: var(--primary);
  font-weight: 700;
  font-size: 0.55em;
  text-shadow: 0 0 6px var(--primary-glow);
}

/* ─── Index Header & Chapter Grid ─── */
#nk-app.nk-theme-6 .nk-index-header {
  text-align: center;
  padding: 38px 20px 28px;
  position: relative;
}

#nk-app.nk-theme-6 .nk-logo {
  font-size: 44px;
  filter: drop-shadow(0 0 14px var(--primary-glow));
}

#nk-app.nk-theme-6 .nk-title {
  font-size: 34px;
  font-weight: 900;
  margin: 10px 0 4px;
  background: linear-gradient(135deg, #06b6d4 0%, #a855f7 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

#nk-app.nk-theme-6 .nk-subtitle {
  color: var(--primary);
  font-weight: 800;
  font-size: 13px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

#nk-app.nk-theme-6 .nk-tagline {
  color: var(--text-dim);
  font-size: 14px;
  margin-top: 6px;
}

#nk-app.nk-theme-6 .nk-chapter-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 18px;
  padding: 10px 0 30px;
}

#nk-app.nk-theme-6 .nk-chapter-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  transition: all 0.25s cubic-bezier(0.2, 0.8, 0.2, 1);
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  display: flex;
  flex-direction: column;
  text-decoration: none;
  position: relative;
}

#nk-app.nk-theme-6 .nk-chapter-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary);
  box-shadow: var(--shadow-lg);
}

#nk-app.nk-theme-6 .nk-ch-number {
  font-size: 11px;
  font-weight: 800;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin-bottom: 6px;
}

#nk-app.nk-theme-6 .nk-ch-title {
  font-size: 17px;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 6px;
}

#nk-app.nk-theme-6 .nk-ch-sub {
  font-size: 13px;
  color: var(--text-dim);
  line-height: 1.5;
  margin-bottom: 14px;
}

#nk-app.nk-theme-6 .nk-ch-status {
  font-size: 12px;
  font-weight: 800;
  color: var(--primary);
  margin-top: auto;
  letter-spacing: 0.3px;
}

/* ─── Topbar & Navigation Steps ─── */
#nk-app.nk-theme-6 .nk-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 16px;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow);
}

#nk-app.nk-theme-6 .nk-back-btn,
#nk-app.nk-theme-6 .nk-topbar-btn {
  background: var(--primary-soft);
  color: var(--primary);
  border: 1px solid var(--border);
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s;
}

#nk-app.nk-theme-6 .nk-back-btn:hover,
#nk-app.nk-theme-6 .nk-topbar-btn:hover {
  background: var(--primary);
  color: #070b14;
  box-shadow: 0 0 16px var(--primary-glow);
}

#nk-app.nk-theme-6 .nk-topbar-title {
  font-size: 15px;
  font-weight: 800;
  color: var(--text);
}

#nk-app.nk-theme-6 .nk-step-bar {
  display: flex;
  gap: 6px;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

#nk-app.nk-theme-6 .nk-step-dot {
  flex: 1;
  height: 5px;
  border-radius: var(--radius-pill);
  background: var(--border);
  transition: all 0.25s ease;
}

#nk-app.nk-theme-6 .nk-step-dot.done {
  background: var(--accent);
}

#nk-app.nk-theme-6 .nk-step-dot.active {
  background: var(--primary);
  height: 7px;
  box-shadow: 0 0 12px var(--primary-glow);
}

/* ─── Hero Card / Intro ─── */
#nk-app.nk-theme-6 .nk-warmup-card,
#nk-app.nk-theme-6 .nk-intro {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  margin-bottom: 20px;
  position: relative;
}

#nk-app.nk-theme-6 .nk-intro-badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  color: var(--primary);
  background: var(--primary-soft);
  border: 1px solid var(--border);
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  margin-bottom: 12px;
}

#nk-app.nk-theme-6 .nk-intro-title {
  font-size: 25px;
  font-weight: 900;
  margin: 0 0 10px;
}

#nk-app.nk-theme-6 .nk-intro-story,
#nk-app.nk-theme-6 .nk-warmup-story {
  color: var(--text-dim);
  font-size: 15px;
  line-height: 1.7;
}

/* ─── Grammar Pattern Cards & Examples ─── */
#nk-app.nk-theme-6 .nk-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  margin-bottom: 20px;
}

#nk-app.nk-theme-6 .nk-card-badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 800;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid rgba(139, 92, 246, 0.3);
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  margin-bottom: 8px;
}

#nk-app.nk-theme-6 .nk-card-title {
  font-size: 20px;
  font-weight: 800;
  margin: 0 0 10px;
}

#nk-app.nk-theme-6 .nk-card-desc {
  color: var(--text-dim);
  font-size: 14px;
  line-height: 1.65;
}

#nk-app.nk-theme-6 .nk-example {
  background: rgba(6, 182, 212, 0.08);
  border-left: 4px solid var(--primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 14px 18px;
  margin-top: 14px;
}

#nk-app.nk-theme-6 .nk-example-jp {
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 10px;
}

#nk-app.nk-theme-6 .nk-example-romaji {
  font-size: 13px;
  color: var(--primary);
  margin-top: 3px;
}

#nk-app.nk-theme-6 .nk-example-id {
  font-size: 14px;
  color: var(--text-dim);
  margin-top: 4px;
}

#nk-app.nk-theme-6 .nk-audio-btn {
  background: var(--surface);
  color: var(--primary);
  border: 1px solid var(--border);
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s;
}

#nk-app.nk-theme-6 .nk-audio-btn:hover {
  background: var(--primary);
  color: #070b14;
  box-shadow: 0 0 12px var(--primary-glow);
  transform: scale(1.1);
}

/* ─── Vocab Grid ─── */
#nk-app.nk-theme-6 .nk-vocab-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 14px;
}

#nk-app.nk-theme-6 .nk-vocab-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 18px;
  text-align: center;
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: all 0.2s;
}

#nk-app.nk-theme-6 .nk-vocab-card:hover {
  border-color: var(--primary);
  box-shadow: 0 0 18px var(--primary-glow);
  transform: translateY(-2px);
}

#nk-app.nk-theme-6 .nk-vocab-jp {
  font-size: 24px;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 4px;
}

#nk-app.nk-theme-6 .nk-vocab-romaji {
  font-size: 12px;
  color: var(--primary);
  font-weight: 700;
}

#nk-app.nk-theme-6 .nk-vocab-meaning {
  font-size: 13px;
  color: var(--text-dim);
  margin-top: 4px;
}

/* ─── Kaiwa / Conversation Bubbles ─── */
#nk-app.nk-theme-6 .nk-kaiwa {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}

#nk-app.nk-theme-6 .nk-kaiwa-line {
  display: flex;
  gap: 12px;
  margin-bottom: 16px;
  align-items: flex-start;
}

#nk-app.nk-theme-6 .nk-kaiwa-line.right {
  flex-direction: row-reverse;
}

#nk-app.nk-theme-6 .nk-kaiwa-speaker {
  background: var(--primary-soft);
  color: var(--primary);
  border: 1px solid var(--border);
  font-weight: 800;
  font-size: 12px;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  white-space: nowrap;
}

#nk-app.nk-theme-6 .nk-kaiwa-bubble {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 12px 18px;
  max-width: 75%;
}

#nk-app.nk-theme-6 .nk-kaiwa-line.right .nk-kaiwa-bubble {
  background: rgba(139, 92, 246, 0.15);
  border-color: rgba(139, 92, 246, 0.4);
}

#nk-app.nk-theme-6 .nk-kaiwa-jp {
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
}

#nk-app.nk-theme-6 .nk-kaiwa-id {
  font-size: 13px;
  color: var(--text-dim);
  margin-top: 4px;
}

/* ─── Drill & Quiz Section ─── */
#nk-app.nk-theme-6 .nk-drill {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}

#nk-app.nk-theme-6 .nk-drill-badge {
  font-size: 11px;
  font-weight: 800;
  color: var(--primary);
  background: var(--primary-soft);
  border: 1px solid var(--border);
  padding: 4px 10px;
  border-radius: var(--radius-pill);
}

#nk-app.nk-theme-6 .nk-drill-q {
  font-size: 16px;
  font-weight: 700;
  margin: 12px 0 16px;
  color: var(--text);
}

#nk-app.nk-theme-6 .nk-drill-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

#nk-app.nk-theme-6 .nk-opt-btn {
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: var(--radius-sm);
  padding: 12px 18px;
  font-size: 14px;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  transition: all 0.2s;
}

#nk-app.nk-theme-6 .nk-opt-btn:hover {
  background: var(--card-hover);
  border-color: var(--primary);
  box-shadow: 0 0 12px var(--primary-glow);
  transform: translateX(4px);
}

#nk-app.nk-theme-6 .nk-opt-btn.correct {
  background: rgba(16, 185, 129, 0.2);
  border-color: #10b981;
  color: #34d399;
  font-weight: 800;
}

#nk-app.nk-theme-6 .nk-opt-btn.wrong {
  background: rgba(244, 63, 94, 0.2);
  border-color: #f43f5e;
  color: #fb7185;
}

/* ─── Buttons ─── */
#nk-app.nk-theme-6 .nk-btn,
#nk-app.nk-theme-6 .nk-btn-primary,
#nk-app.nk-theme-6 .nk-btn-next {
  background: linear-gradient(135deg, #06b6d4 0%, #0284c7 100%);
  color: #ffffff !important;
  border: none;
  padding: 10px 22px;
  border-radius: var(--radius-pill);
  font-size: 14px;
  font-weight: 800;
  cursor: pointer;
  box-shadow: 0 0 16px var(--primary-glow);
  transition: all 0.2s;
}

#nk-app.nk-theme-6 .nk-btn:hover,
#nk-app.nk-theme-6 .nk-btn-primary:hover,
#nk-app.nk-theme-6 .nk-btn-next:hover {
  filter: brightness(1.15);
  box-shadow: 0 0 24px var(--primary-glow);
  transform: translateY(-1px);
}

#nk-app.nk-theme-6 .nk-btn-prev {
  background: var(--surface);
  color: var(--text-dim) !important;
  border: 1px solid var(--border);
}

/* ─── LMS Modules ─── */
#nk-app.nk-theme-6 .nk-lms-card,
.nk-theme-6.nk-lms-standalone .nk-lms-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  box-shadow: var(--shadow);
}

#nk-app.nk-theme-6 .nk-callout-info {
  background: rgba(6, 182, 212, 0.1);
  border-left: 4px solid var(--primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 14px 18px;
  color: #38bdf8;
}

#nk-app.nk-theme-6 .nk-callout-warning {
  background: rgba(245, 158, 11, 0.1);
  border-left: 4px solid var(--gold);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 14px 18px;
  color: #fbbf24;
}

#nk-app.nk-theme-6 .nk-table th {
  background: rgba(6, 182, 212, 0.1);
  color: var(--text);
  padding: 10px 14px;
  border-bottom: 2px solid var(--primary);
  font-weight: 800;
}

#nk-app.nk-theme-6 .nk-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
}

#nk-app.nk-theme-6 .nk-btn-download {
  background: linear-gradient(135deg, #06b6d4 0%, #3b82f6 100%);
  color: #ffffff !important;
  border-radius: var(--radius-pill);
  padding: 8px 18px;
  font-weight: 800;
  text-decoration: none;
  box-shadow: 0 0 14px var(--primary-glow);
}

/* ─── Student Dashboard (nk-dash-wrap.nk-theme-6) ─── */
.nk-dash-wrap.nk-theme-6 {
  --nk-dash-primary: #06b6d4;
  --nk-dash-primary-dark: #0891b2;
  --nk-dash-accent: #8b5cf6;
  --nk-dash-bg: #070b14;
  --nk-dash-surface: rgba(15, 23, 42, 0.8);
  --nk-dash-border: rgba(56, 189, 248, 0.25);
  --nk-dash-text-main: #f8fafc;
  --nk-dash-text-muted: #94a3b8;
  --nk-dash-radius: 16px;
}

.nk-dash-wrap.nk-theme-6 .nk-dash-header {
  background: linear-gradient(135deg, #0f172a 0%, #1e1b4b 50%, #06b6d4 100%);
  border: 1px solid rgba(56, 189, 248, 0.3);
  border-radius: 18px;
}

.nk-dash-wrap.nk-theme-6 .nk-dash-stat-card {
  border-color: rgba(56, 189, 248, 0.2);
  background: rgba(15, 23, 42, 0.7);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.nk-dash-wrap.nk-theme-6 .nk-dash-btn-primary,
.nk-dash-wrap.nk-theme-6 .nk-dash-btn-resume {
  background: linear-gradient(135deg, #06b6d4 0%, #0284c7 100%);
  box-shadow: 0 0 16px rgba(6, 182, 212, 0.35);
}

/* ─── Module Persiapan (nk-persiapan-wrap.nk-theme-6) ─── */
.nk-persiapan-wrap.nk-theme-6 .nk-persiapan-header {
  background: linear-gradient(135deg, #0f172a 0%, #1e1b4b 60%, #06b6d4 100%) !important;
  border: 1px solid rgba(56, 189, 248, 0.3);
  border-radius: 18px;
}

.nk-persiapan-wrap.nk-theme-6 .nk-pcard {
  background: rgba(15, 23, 42, 0.8) !important;
  border-color: rgba(56, 189, 248, 0.25) !important;
  border-radius: 16px !important;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}