/* =============================================================
   SECTION 4.1 — PHRASAL VERBS — SPACE WORLD PRESENTATION CSS
   Scope: all .pv-* classes
   ============================================================= */

/* ── 01. ANIMATED SPACE BACKGROUND ── */
.pv-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
}

.pv-bg-gradient {
  position: absolute;
  inset: 0;
  background: radial-gradient(
    ellipse 90% 70% at 30% 20%,
    #0d1d36 0%,
    #081224 50%,
    #040814 100%
  );
}

.pv-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.9;
}

.pv-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  pointer-events: none;
}

.pv-glow-1 {
  width: 620px;
  height: 620px;
  background: radial-gradient(circle, rgba(58, 98, 175, 0.24) 0%, transparent 70%);
  top: -100px;
  right: -80px;
  animation: pvGlowFloat1 16s ease-in-out infinite alternate;
}

.pv-glow-2 {
  width: 480px;
  height: 480px;
  background: radial-gradient(circle, rgba(182, 154, 99, 0.16) 0%, transparent 70%);
  bottom: 5%;
  left: -60px;
  animation: pvGlowFloat2 18s ease-in-out infinite alternate;
}

.pv-glow-3 {
  width: 380px;
  height: 380px;
  background: radial-gradient(circle, rgba(139, 158, 204, 0.14) 0%, transparent 70%);
  top: 45%;
  left: 50%;
  transform: translate(-50%, -50%);
  animation: pvGlowFloat3 20s ease-in-out infinite alternate;
}

@keyframes pvGlowFloat1 {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(-40px, 35px) scale(1.08); }
}
@keyframes pvGlowFloat2 {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(35px, -35px) scale(1.06); }
}
@keyframes pvGlowFloat3 {
  0% { transform: translate(-50%, -50%) scale(1); }
  100% { transform: translate(-45%, -55%) scale(1.12); }
}

@media (prefers-reduced-motion: reduce) {
  .pv-glow { animation: none !important; }
}

/* ── 02. PRESENTATION APP SHELL & CONTAINER ── */
.pv-pres-wrapper {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  padding: 32px 24px 80px;
  box-sizing: border-box;
  font-family: var(--font-sans, 'Inter', sans-serif);
  color: #E2E8F0;
}

.pv-pres-container {
  width: 100%;
  max-width: 960px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

/* ── 03. TOP HEADER BAR (Breadcrumbs + Progress) ── */
.pv-top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 22px;
  background: rgba(14, 26, 50, 0.65);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(139, 158, 204, 0.22);
  border-radius: var(--radius-lg, 18px);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.25);
  flex-wrap: wrap;
  gap: 12px;
}

.pv-top-breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-ui, sans-serif);
  font-size: 0.84rem;
  color: rgba(180, 210, 255, 0.65);
}

.pv-top-link {
  color: rgba(180, 210, 255, 0.75);
  cursor: pointer;
  transition: color 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.pv-top-link:hover {
  color: #FFFFFF;
}

.pv-top-sep {
  color: rgba(139, 158, 204, 0.35);
}

.pv-top-current {
  color: var(--academic-gold, #CCA866);
  font-weight: 700;
}

.pv-progress-pill {
  display: flex;
  align-items: center;
  gap: 12px;
  background: rgba(255, 255, 255, 0.06);
  padding: 6px 14px;
  border-radius: var(--radius-full, 9999px);
  border: 1px solid rgba(139, 158, 204, 0.18);
}

.pv-progress-text {
  font-family: var(--font-ui, sans-serif);
  font-size: 0.8rem;
  font-weight: 700;
  color: rgba(200, 225, 255, 0.9);
}

.pv-progress-track {
  width: 90px;
  height: 4px;
  background: rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-full, 9999px);
  overflow: hidden;
}

.pv-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--refined-blue, #547CA5), var(--academic-gold, #CCA866));
  border-radius: var(--radius-full, 9999px);
  transition: width 0.35s ease;
}

/* ── 04. VIEWPORT FOR ACTIVE SLIDE ── */
.pv-screen-viewport {
  position: relative;
  min-height: 480px;
}

.pv-slide {
  background: rgba(12, 23, 44, 0.72);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(139, 158, 204, 0.22);
  border-radius: var(--radius-xl, 24px);
  padding: 44px 48px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.35), 0 0 0 1px rgba(255, 255, 255, 0.04);
  box-sizing: border-box;
}

/* ── 05. SLIDE 0: INTRO STYLES ── */
.pv-slide-intro {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 56px 44px;
}

.pv-intro-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-ui, sans-serif);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--space-stardust, #8B9ECC);
  background: rgba(30, 45, 94, 0.4);
  border: 1px solid rgba(139, 158, 204, 0.3);
  padding: 6px 16px;
  border-radius: var(--radius-full, 9999px);
  margin-bottom: 22px;
}

.pv-intro-title {
  font-family: var(--font-serif, 'Playfair Display', serif);
  font-size: clamp(2.2rem, 4.5vw, 3.2rem);
  font-weight: 800;
  color: #FFFFFF;
  line-height: 1.2;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.pv-title-highlight {
  background: linear-gradient(135deg, #A8C4F0 0%, #D4AF60 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.pv-intro-subtitle {
  font-size: 1.12rem;
  color: rgba(200, 220, 255, 0.85);
  max-width: 680px;
  line-height: 1.7;
  margin: 0 auto 36px;
}

.pv-intro-cards-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  width: 100%;
  max-width: 780px;
  margin-bottom: 38px;
}

.pv-intro-feature-card {
  background: rgba(18, 34, 64, 0.6);
  border: 1px solid rgba(139, 158, 204, 0.2);
  border-radius: var(--radius-lg, 16px);
  padding: 24px;
  text-align: left;
  transition: transform 0.2s, border-color 0.2s;
}

.pv-intro-feature-card:hover {
  border-color: var(--academic-gold, #CCA866);
  transform: translateY(-2px);
}

.pv-feature-icon {
  font-size: 1.4rem;
  color: var(--academic-gold, #CCA866);
  margin-bottom: 10px;
}

.pv-feature-title {
  font-family: var(--font-serif, serif);
  font-size: 1.15rem;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 8px;
}

.pv-feature-desc {
  font-size: 0.9rem;
  color: rgba(200, 220, 255, 0.75);
  line-height: 1.55;
  margin: 0;
}

.pv-intro-cta-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.pv-start-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 36px;
  background: linear-gradient(135deg, var(--academic-navy, #233D5B) 0%, var(--space-indigo, #1E2D5E) 100%);
  color: #FFFFFF;
  border: 1px solid rgba(139, 158, 204, 0.35);
  border-radius: var(--radius-md, 14px);
  font-family: var(--font-ui, sans-serif);
  font-size: 1.02rem;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.3);
  transition: all 0.22s;
}

.pv-start-btn:hover {
  background: linear-gradient(135deg, var(--refined-blue, #547CA5) 0%, var(--space-violet, #2D2060) 100%);
  border-color: var(--academic-gold, #CCA866);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(84, 124, 165, 0.35);
}

.pv-cta-subtext {
  font-family: var(--font-ui, sans-serif);
  font-size: 0.78rem;
  color: rgba(180, 210, 255, 0.55);
  letter-spacing: 0.04em;
}

/* ── 06. SLIDES 1–5: VERB CARD STYLES ── */
.pv-slide-verb {
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.pv-verb-header-strip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(139, 158, 204, 0.18);
  padding-bottom: 16px;
}

.pv-verb-num-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.pv-num-circle {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: rgba(182, 154, 99, 0.2);
  border: 1px solid var(--academic-gold, #CCA866);
  color: var(--academic-gold, #CCA866);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-ui, sans-serif);
  font-size: 0.85rem;
  font-weight: 800;
}

.pv-cat-name {
  font-family: var(--font-ui, sans-serif);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(200, 225, 255, 0.8);
}

.pv-register-badge {
  font-family: var(--font-ui, sans-serif);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #10B981;
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.3);
  padding: 4px 12px;
  border-radius: var(--radius-full, 9999px);
}

.pv-verb-hero-display {
  text-align: center;
  padding: 10px 0;
}

.pv-verb-heading {
  font-family: var(--font-serif, 'Playfair Display', serif);
  font-size: clamp(2.4rem, 5.5vw, 3.8rem);
  font-weight: 800;
  letter-spacing: 0.02em;
  color: #FFFFFF;
  margin: 0;
  text-shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
}

.pv-verb-content-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.pv-verb-card {
  border-radius: var(--radius-lg, 16px);
  padding: 26px 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.pv-meaning-card {
  background: rgba(18, 34, 64, 0.65);
  border: 1px solid rgba(139, 158, 204, 0.22);
  border-left: 4px solid var(--refined-blue, #547CA5);
}

.pv-example-card {
  background: rgba(28, 38, 64, 0.7);
  border: 1px solid rgba(182, 154, 99, 0.28);
  border-left: 4px solid var(--academic-gold, #CCA866);
}

.pv-card-header {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-ui, sans-serif);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(180, 210, 255, 0.75);
}

.pv-meaning-card .pv-card-header {
  color: var(--refined-blue-light, #6E95BE);
}

.pv-example-card .pv-card-header {
  color: var(--academic-gold, #CCA866);
}

.pv-card-body-text {
  font-size: 1.05rem;
  color: #E2E8F0;
  line-height: 1.65;
  margin: 0;
}

.pv-example-quote {
  font-family: var(--font-serif, serif);
  font-size: 1.14rem;
  font-style: italic;
  color: #FFFFFF;
  line-height: 1.65;
  margin: 0;
}

.pv-verb-note-banner {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 18px;
  background: rgba(182, 154, 99, 0.08);
  border: 1px dashed rgba(182, 154, 99, 0.3);
  border-radius: var(--radius-md, 12px);
  font-size: 0.88rem;
  color: rgba(225, 215, 185, 0.9);
}

.pv-verb-note-banner i {
  color: var(--academic-gold, #CCA866);
  font-size: 1.1rem;
  flex-shrink: 0;
}

/* ── 07. SLIDE 6: SUMMARY STYLES ── */
.pv-slide-summary {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 44px 36px;
}

.pv-summary-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-ui, sans-serif);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--academic-gold, #CCA866);
  background: rgba(182, 154, 99, 0.12);
  border: 1px solid rgba(182, 154, 99, 0.3);
  padding: 5px 16px;
  border-radius: var(--radius-full, 9999px);
  margin-bottom: 18px;
}

.pv-summary-title {
  font-family: var(--font-serif, serif);
  font-size: clamp(1.8rem, 3.5vw, 2.4rem);
  font-weight: 800;
  color: #FFFFFF;
  margin-bottom: 14px;
}

.pv-summary-prose {
  font-size: 1.05rem;
  color: rgba(200, 220, 255, 0.85);
  max-width: 680px;
  line-height: 1.65;
  margin: 0 auto 32px;
}

.pv-recap-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 14px;
  width: 100%;
  margin-bottom: 34px;
}

.pv-recap-card {
  background: rgba(18, 34, 64, 0.65);
  border: 1px solid rgba(139, 158, 204, 0.22);
  border-radius: var(--radius-md, 14px);
  padding: 16px 14px;
  text-align: left;
  cursor: pointer;
  transition: all 0.2s;
}

.pv-recap-card:hover {
  background: rgba(28, 48, 88, 0.85);
  border-color: var(--academic-gold, #CCA866);
  transform: translateY(-2px);
}

.pv-recap-top {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.pv-recap-num {
  font-family: var(--font-ui, sans-serif);
  font-size: 0.72rem;
  font-weight: 800;
  color: var(--academic-gold, #CCA866);
}

.pv-recap-verb {
  font-family: var(--font-serif, serif);
  font-size: 0.98rem;
  font-weight: 700;
  color: #FFFFFF;
}

.pv-recap-meaning {
  font-size: 0.78rem;
  color: rgba(200, 220, 255, 0.7);
  line-height: 1.4;
  margin: 0;
}

.pv-summary-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: center;
}

/* ── 08. FIXED BOTTOM NAVIGATION CONTROLS ── */
.pv-bottom-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 22px;
  background: rgba(14, 26, 50, 0.65);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(139, 158, 204, 0.22);
  border-radius: var(--radius-lg, 18px);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.25);
  gap: 16px;
}

.pv-nav-left,
.pv-nav-right {
  display: flex;
  align-items: center;
  min-width: 140px;
}

.pv-nav-right {
  justify-content: flex-end;
}

.pv-nav-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 22px;
  border-radius: var(--radius-md, 12px);
  font-family: var(--font-ui, sans-serif);
  font-size: 0.88rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s;
  border: 1px solid transparent;
}

.pv-nav-btn-prev {
  background: rgba(255, 255, 255, 0.08);
  color: #E2E8F0;
  border-color: rgba(139, 158, 204, 0.25);
}

.pv-nav-btn-prev:hover {
  background: rgba(255, 255, 255, 0.15);
  color: #FFFFFF;
  border-color: rgba(180, 210, 255, 0.4);
}

.pv-nav-btn-next {
  background: var(--refined-blue, #547CA5);
  color: #FFFFFF;
  box-shadow: 0 4px 14px rgba(84, 124, 165, 0.35);
}

.pv-nav-btn-next:hover {
  background: var(--refined-blue-light, #6E95BE);
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(84, 124, 165, 0.5);
}

.pv-nav-btn-gold {
  background: var(--academic-gold, #B69A63);
  color: #FFFFFF;
  box-shadow: 0 4px 14px rgba(182, 154, 99, 0.35);
}

.pv-nav-btn-gold:hover {
  background: var(--academic-gold-light, #CCA866);
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(182, 154, 99, 0.5);
}

.pv-nav-hint {
  font-family: var(--font-ui, sans-serif);
  font-size: 0.76rem;
  color: rgba(180, 210, 255, 0.5);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* ── 09. SLIDE DOTS ── */
.pv-slide-dots {
  display: flex;
  align-items: center;
  gap: 8px;
}

.pv-dot-btn {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(139, 158, 204, 0.3);
  border: none;
  cursor: pointer;
  padding: 0;
  transition: all 0.25s;
}

.pv-dot-btn:hover {
  background: rgba(180, 210, 255, 0.6);
  transform: scale(1.2);
}

.pv-dot-btn.active {
  width: 28px;
  border-radius: var(--radius-full, 9999px);
  background: var(--academic-gold, #CCA866);
  box-shadow: 0 0 10px rgba(204, 168, 102, 0.5);
}

/* ── 10. ANIMATIONS ── */
@keyframes pvFadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.animate-fade-in {
  animation: pvFadeIn 0.32s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

/* ── 11. RESPONSIVE MEDIA QUERIES ── */
@media (max-width: 768px) {
  .pv-pres-wrapper {
    padding: 18px 14px 60px;
  }

  .pv-slide {
    padding: 28px 20px;
  }

  .pv-intro-cards-grid,
  .pv-verb-content-grid {
    grid-template-columns: 1fr;
  }

  .pv-top-bar,
  .pv-bottom-nav {
    padding: 12px 16px;
  }

  .pv-nav-left,
  .pv-nav-right {
    min-width: auto;
  }

  .pv-nav-hint {
    display: none;
  }

  .pv-recap-grid {
    grid-template-columns: 1fr;
  }
}