/* ============================================
   OBJECTS & CLASSES IN C++ — PRESENTATION
   Design: Retro-Futuristic Dark Tech
   Palette: Deep Navy + Electric Cyan + Indigo
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Syne:wght@400;600;700;800&family=JetBrains+Mono:wght@400;500;700&family=Plus+Jakarta+Sans:wght@300;400;500;600&display=swap');

/* ── CSS Variables ── */
:root {
  --bg-deep:      #080C18;
  --bg-card:      #0D1526;
  --bg-card2:     #111D35;
  --border:       #1E3A5F;
  --border-glow:  #00D4FF33;
  --cyan:         #00D4FF;
  --cyan-dim:     #00D4FF88;
  --cyan-faint:   #00D4FF18;
  --indigo:       #7B68EE;
  --indigo-dim:   #7B68EE88;
  --purple:       #A78BFA;
  --green:        #4ADE80;
  --orange:       #FB923C;
  --red:          #F87171;
  --yellow:       #FBBF24;
  --text-primary: #E8F4FD;
  --text-secondary: #8BAFC8;
  --text-muted:   #4A6A85;
  --font-display: 'Syne', sans-serif;
  --font-body:    'Plus Jakarta Sans', sans-serif;
  --font-code:    'JetBrains Mono', monospace;
  --slide-w: 100vw;
  --slide-h: 100vh;
}

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

html, body {
  width: 100%; height: 100%;
  overflow: hidden;
  background: var(--bg-deep);
  color: var(--text-primary);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
}

/* ── Background Grid ── */
.bg-grid {
  position: absolute; inset: 0; z-index: 0;
  background-image:
    linear-gradient(rgba(0,212,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,212,255,0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
}

/* ── Glow Orbs ── */
.glow-orb {
  position: absolute; border-radius: 50%;
  filter: blur(80px); pointer-events: none; z-index: 0;
}
.orb1 { width: 400px; height: 400px; background: rgba(0,212,255,0.08); top: -100px; right: -100px; }
.orb2 { width: 350px; height: 350px; background: rgba(123,104,238,0.10); bottom: -80px; left: -80px; }
.orb3 { width: 300px; height: 300px; background: rgba(0,212,255,0.06); top: 50%; left: 50%; transform: translate(-50%,-50%); }

/* ── Progress Bar ── */
.progress-bar {
  position: fixed; top: 0; left: 0; height: 3px; z-index: 1000;
  background: linear-gradient(90deg, var(--cyan), var(--indigo));
  transition: width 0.4s cubic-bezier(0.4,0,0.2,1);
  box-shadow: 0 0 12px var(--cyan);
}

/* ── Slide Counter ── */
.slide-counter {
  position: fixed; top: 20px; right: 24px; z-index: 100;
  font-family: var(--font-code); font-size: 13px;
  color: var(--text-muted); letter-spacing: 0.05em;
}
.slide-counter #currentSlide { color: var(--cyan); font-weight: 700; }
.slide-counter .sep { margin: 0 4px; }

/* ── Navigation Buttons ── */
.nav-btn {
  position: fixed; top: 50%; transform: translateY(-50%);
  z-index: 100; width: 44px; height: 44px;
  background: rgba(13,21,38,0.8); border: 1px solid var(--border);
  border-radius: 50%; cursor: pointer; color: var(--text-secondary);
  display: flex; align-items: center; justify-content: center;
  transition: all 0.25s ease; backdrop-filter: blur(8px);
}
.nav-btn svg { width: 20px; height: 20px; }
.nav-btn:hover { border-color: var(--cyan); color: var(--cyan); box-shadow: 0 0 16px var(--cyan-dim); }
.nav-btn.prev { left: 16px; }
.nav-btn.next { right: 16px; }
.nav-btn:disabled { opacity: 0.2; cursor: not-allowed; }

/* ── Dot Navigation ── */
.dot-nav {
  position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%);
  z-index: 100; display: flex; gap: 8px; align-items: center;
}
.dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--text-muted); cursor: pointer;
  transition: all 0.3s ease;
}
.dot.active { width: 24px; border-radius: 3px; background: var(--cyan); box-shadow: 0 0 8px var(--cyan); }
.dot:hover { background: var(--cyan-dim); }

/* ── Slides Wrapper ── */
.slides-wrapper {
  width: 100vw; height: 100vh;
  position: relative;
}

/* ── Base Slide ── */
.slide {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  padding: 48px 72px 56px;
  display: flex; flex-direction: column;
  overflow: hidden;
  opacity: 0; transform: translateX(60px);
  transition: opacity 0.5s cubic-bezier(0.4,0,0.2,1),
              transform 0.5s cubic-bezier(0.4,0,0.2,1);
  pointer-events: none;
}
.slide.active {
  opacity: 1; transform: translateX(0);
  pointer-events: all;
}
.slide.exit-left {
  opacity: 0; transform: translateX(-60px);
}

/* ── Slide Header ── */
.slide-header {
  display: flex; align-items: center; gap: 16px;
  margin-bottom: 28px; position: relative; z-index: 1;
}
.slide-num {
  font-family: var(--font-code); font-size: 11px; font-weight: 700;
  color: var(--cyan); letter-spacing: 0.15em;
  background: var(--cyan-faint); border: 1px solid var(--border-glow);
  padding: 4px 10px; border-radius: 4px;
}
.slide-title-text {
  font-family: var(--font-display); font-size: clamp(22px, 2.8vw, 34px);
  font-weight: 800; color: var(--text-primary); letter-spacing: -0.02em;
}
.slide-title-text code {
  font-family: var(--font-code); color: var(--cyan); font-size: 0.85em;
  background: var(--cyan-faint); padding: 2px 8px; border-radius: 4px;
}

/* ── Animations ── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}
.animate-in { opacity: 0; }
.slide.active .animate-in { animation: fadeUp 0.5s ease forwards; }
.delay-1 { animation-delay: 0.1s !important; }
.delay-2 { animation-delay: 0.2s !important; }
.delay-3 { animation-delay: 0.3s !important; }
.delay-4 { animation-delay: 0.4s !important; }
.delay-5 { animation-delay: 0.5s !important; }
.delay-6 { animation-delay: 0.6s !important; }

/* ── Two Column Layout ── */
.two-col {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 32px; flex: 1; position: relative; z-index: 1;
  align-items: start;
}
.col-left, .col-right { display: flex; flex-direction: column; gap: 16px; }

/* ── Lead Text ── */
.lead-text {
  font-size: clamp(13px, 1.3vw, 16px); line-height: 1.7;
  color: var(--text-secondary); font-weight: 400;
}
.lead-text .highlight {
  color: var(--cyan); font-weight: 600;
  background: var(--cyan-faint); padding: 1px 6px; border-radius: 3px;
}

/* ── Code Block ── */
.code-block {
  background: #060B14; border: 1px solid var(--border);
  border-radius: 10px; overflow: hidden;
  box-shadow: 0 4px 32px rgba(0,0,0,0.5), 0 0 0 1px rgba(0,212,255,0.05);
}
.code-block.compact .code-body { font-size: 11px; padding: 12px 16px; }
.code-block.full-width { width: 100%; }
.code-header {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 16px; background: #0A1020;
  border-bottom: 1px solid var(--border);
}
.code-dots { display: flex; gap: 6px; }
.code-dots span {
  width: 10px; height: 10px; border-radius: 50%;
}
.code-dots span:nth-child(1) { background: #FF5F57; }
.code-dots span:nth-child(2) { background: #FFBD2E; }
.code-dots span:nth-child(3) { background: #28CA41; }
.code-filename {
  font-family: var(--font-code); font-size: 11px;
  color: var(--text-muted); margin-left: 4px;
}
.code-body {
  font-family: var(--font-code); font-size: clamp(10px, 1.1vw, 13px);
  line-height: 1.75; padding: 16px 20px;
  color: #C9D8E8; white-space: pre; overflow-x: auto;
}
.code-two-col {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 0; border-top: 1px solid var(--border);
}
.code-two-col pre { border-right: 1px solid var(--border); }
.code-two-col pre:last-child { border-right: none; }

/* ── Syntax Highlighting ── */
.code-kw   { color: #C792EA; font-weight: 600; }
.code-cls  { color: #FFCB6B; }
.code-fn   { color: #82AAFF; }
.code-method { color: #80CBC4; }
.code-type { color: #F78C6C; }
.code-str  { color: #C3E88D; }
.code-num  { color: #F78C6C; }
.code-comment { color: #546E7A; font-style: italic; }
.code-br   { color: #89DDFF; }
.code-indent  { display: block; padding-left: 1.5em; }
.code-indent2 { display: block; padding-left: 3em; }

/* ============================================
   SLIDE 1 — TITLE
   ============================================ */
.slide-title {
  justify-content: center; align-items: center; text-align: center;
}
.title-content {
  position: relative; z-index: 1;
  display: flex; flex-direction: column; align-items: center; gap: 20px;
}
.tag-line {
  font-family: var(--font-code); font-size: 12px; letter-spacing: 0.2em;
  color: var(--cyan); text-transform: uppercase;
  background: var(--cyan-faint); border: 1px solid var(--border-glow);
  padding: 6px 18px; border-radius: 20px;
}
.main-title {
  font-family: var(--font-display); font-weight: 800;
  line-height: 1.05; letter-spacing: -0.03em;
}
.title-line {
  display: block; font-size: clamp(48px, 7vw, 88px);
  color: var(--text-primary);
}
.title-line.accent {
  background: linear-gradient(135deg, var(--cyan), var(--indigo));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.subtitle {
  font-size: clamp(14px, 1.5vw, 18px); color: var(--text-secondary);
  font-weight: 300; letter-spacing: 0.02em;
}
.title-code {
  font-family: var(--font-code); font-size: clamp(11px, 1.2vw, 14px);
  background: #060B14; border: 1px solid var(--border);
  border-radius: 10px; padding: 16px 28px;
  text-align: left; line-height: 1.8;
  box-shadow: 0 0 40px rgba(0,212,255,0.06);
}
.scroll-hint {
  font-size: 12px; color: var(--text-muted);
  display: flex; align-items: center; gap: 8px;
}
kbd {
  font-family: var(--font-code); font-size: 11px;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 4px; padding: 2px 8px; color: var(--cyan);
}

/* ============================================
   SLIDE 2 — AGENDA
   ============================================ */
.agenda-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 14px; flex: 1; position: relative; z-index: 1;
  align-content: start;
}
.agenda-item {
  display: flex; align-items: center; gap: 16px;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 10px; padding: 16px 20px;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.agenda-item:hover {
  border-color: var(--cyan-dim);
  box-shadow: 0 0 20px rgba(0,212,255,0.08);
}
.agenda-icon {
  font-family: var(--font-code); font-size: 22px; font-weight: 800;
  color: var(--cyan); opacity: 0.4; min-width: 40px;
}
.agenda-text { display: flex; flex-direction: column; gap: 3px; }
.agenda-text strong { font-size: 15px; font-weight: 600; color: var(--text-primary); }
.agenda-text span { font-size: 12px; color: var(--text-muted); }

/* ============================================
   SLIDE 3 — OOP CONCEPT
   ============================================ */
.pillars {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.pillar {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 8px; padding: 12px 14px;
  display: flex; align-items: center; gap: 10px;
  font-size: 13px; font-weight: 500; color: var(--text-secondary);
  transition: border-color 0.2s;
}
.pillar:hover { border-color: var(--indigo-dim); }
.pillar-icon { font-size: 18px; }
.pillar-label { font-weight: 600; }

.analogy-box {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 12px; padding: 24px; height: 100%;
}
.analogy-title {
  font-family: var(--font-code); font-size: 11px; letter-spacing: 0.15em;
  color: var(--cyan); text-transform: uppercase; margin-bottom: 20px;
}
.analogy-row {
  display: flex; align-items: center; justify-content: center;
  gap: 16px; margin-bottom: 20px;
}
.analogy-item {
  background: var(--bg-card2); border: 1px solid var(--border);
  border-radius: 10px; padding: 16px 20px;
  text-align: center; font-size: 13px; color: var(--text-secondary);
  display: flex; flex-direction: column; gap: 6px;
}
.analogy-item.obj { border-color: var(--cyan-dim); }
.analogy-icon { font-size: 28px; }
.analogy-sub { font-family: var(--font-code); font-size: 11px; color: var(--cyan); font-weight: 700; }
.analogy-arrow { font-size: 20px; color: var(--text-muted); }
.analogy-desc { font-size: 13px; color: var(--text-secondary); line-height: 1.6; }
.analogy-desc strong { color: var(--cyan); }

/* ============================================
   SLIDE 4 — DEFINING A CLASS
   ============================================ */
.syntax-box {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 8px; padding: 16px 20px;
}
.syntax-title {
  font-family: var(--font-code); font-size: 10px; letter-spacing: 0.15em;
  color: var(--text-muted); text-transform: uppercase; margin-bottom: 10px;
}
.syntax-content {
  font-family: var(--font-code); font-size: 13px; line-height: 1.8;
  color: #C9D8E8;
}
.feature-list {
  list-style: none; display: flex; flex-direction: column; gap: 8px;
}
.feature-list li {
  font-size: 13px; color: var(--text-secondary); padding-left: 18px;
  position: relative; line-height: 1.5;
}
.feature-list li::before {
  content: '▸'; position: absolute; left: 0;
  color: var(--cyan); font-size: 10px; top: 2px;
}
.feature-list code {
  font-family: var(--font-code); font-size: 12px;
  color: var(--cyan); background: var(--cyan-faint);
  padding: 1px 5px; border-radius: 3px;
}

/* ============================================
   SLIDE 5 — OBJECTS
   ============================================ */
.info-cards { display: flex; flex-direction: column; gap: 12px; }
.info-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 8px; padding: 14px 18px;
}
.info-card-title {
  font-family: var(--font-code); font-size: 11px; letter-spacing: 0.1em;
  color: var(--cyan); text-transform: uppercase; margin-bottom: 6px;
}
.info-card code {
  font-family: var(--font-code); font-size: 12px;
  color: var(--green); display: block; margin-bottom: 6px;
}
.info-card p { font-size: 12px; color: var(--text-muted); line-height: 1.5; }

/* ============================================
   SLIDE 6 — ACCESS SPECIFIERS
   ============================================ */
.access-layout {
  display: flex; flex-direction: column; gap: 18px;
  flex: 1; position: relative; z-index: 1;
}
.access-cards {
  display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 14px;
}
.access-card {
  border-radius: 10px; padding: 18px 20px;
  border: 1px solid; display: flex; flex-direction: column; gap: 10px;
}
.access-card.public  { background: rgba(74,222,128,0.05); border-color: rgba(74,222,128,0.25); }
.access-card.private { background: rgba(248,113,113,0.05); border-color: rgba(248,113,113,0.25); }
.access-card.protected { background: rgba(251,191,36,0.05); border-color: rgba(251,191,36,0.25); }
.access-badge {
  font-family: var(--font-code); font-size: 13px; font-weight: 700;
  display: inline-block; padding: 3px 10px; border-radius: 4px;
  width: fit-content;
}
.public  .access-badge { color: var(--green);  background: rgba(74,222,128,0.12); }
.private .access-badge { color: var(--red);    background: rgba(248,113,113,0.12); }
.protected .access-badge { color: var(--yellow); background: rgba(251,191,36,0.12); }
.access-desc { font-size: 12px; color: var(--text-secondary); line-height: 1.6; }
.access-use  { font-size: 11px; color: var(--text-muted); font-style: italic; }
.access-code { flex-shrink: 0; }

/* ============================================
   SLIDE 7 — CONSTRUCTORS
   ============================================ */
.constructor-types { display: flex; flex-direction: column; gap: 10px; }
.ctype {
  display: flex; align-items: flex-start; gap: 12px;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 8px; padding: 12px 16px;
}
.ctype-dot {
  width: 10px; height: 10px; border-radius: 50%; margin-top: 4px; flex-shrink: 0;
}
.ctype-dot.default   { background: var(--cyan); box-shadow: 0 0 8px var(--cyan); }
.ctype-dot.param     { background: var(--indigo); box-shadow: 0 0 8px var(--indigo); }
.ctype-dot.copy      { background: var(--green); box-shadow: 0 0 8px var(--green); }
.ctype div { display: flex; flex-direction: column; gap: 3px; }
.ctype strong { font-size: 13px; color: var(--text-primary); }
.ctype span   { font-size: 12px; color: var(--text-muted); }
.key-rule {
  background: var(--cyan-faint); border: 1px solid var(--border-glow);
  border-radius: 8px; padding: 10px 16px;
  font-family: var(--font-code); font-size: 11px; color: var(--cyan);
  display: flex; align-items: center; gap: 8px;
}
.rule-icon { font-size: 14px; }

/* ============================================
   SLIDE 8 — DESTRUCTOR
   ============================================ */
.destructor-facts { display: flex; flex-direction: column; gap: 10px; }
.fact-item {
  display: flex; align-items: center; gap: 14px;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 8px; padding: 10px 16px;
}
.fact-icon {
  font-family: var(--font-code); font-size: 16px; font-weight: 700;
  color: var(--red); min-width: 28px; text-align: center;
}
.fact-item div { font-size: 13px; color: var(--text-secondary); }
.fact-item code {
  font-family: var(--font-code); font-size: 12px;
  color: var(--red); background: rgba(248,113,113,0.1);
  padding: 1px 5px; border-radius: 3px;
}
.lifecycle-bar {
  display: flex; align-items: center; gap: 6px;
  flex-wrap: wrap;
}
.lc-step {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 6px; padding: 6px 12px;
  font-size: 11px; color: var(--text-secondary);
  font-family: var(--font-code);
}
.lc-step.accent { border-color: var(--red); color: var(--red); background: rgba(248,113,113,0.08); }
.lc-arrow { color: var(--text-muted); font-size: 14px; }

/* ============================================
   SLIDE 9 — THIS POINTER
   ============================================ */
.this-visual { }
.this-box {
  background: var(--bg-card); border: 1px solid var(--border-glow);
  border-radius: 10px; padding: 16px 20px;
  display: flex; flex-direction: column; gap: 8px;
}
.this-title {
  font-family: var(--font-code); font-size: 12px; color: var(--cyan);
  font-weight: 700; margin-bottom: 4px;
}
.this-row {
  font-size: 13px; color: var(--text-secondary);
  display: flex; align-items: center; gap: 8px;
}
.this-arrow { color: var(--cyan); font-weight: 700; }
.this-row code {
  font-family: var(--font-code); font-size: 12px;
  color: var(--cyan); background: var(--cyan-faint);
  padding: 1px 6px; border-radius: 3px;
}
.def-outside {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 8px; padding: 14px 18px;
}
.def-title {
  font-family: var(--font-code); font-size: 10px; letter-spacing: 0.15em;
  color: var(--text-muted); text-transform: uppercase; margin-bottom: 8px;
}
.def-outside code {
  font-family: var(--font-code); font-size: 12px;
  color: var(--green); display: block; margin-bottom: 6px;
}
.def-outside p { font-size: 12px; color: var(--text-muted); }
.def-outside p code {
  display: inline; color: var(--cyan);
  background: var(--cyan-faint); padding: 1px 5px; border-radius: 3px;
}

/* ============================================
   SLIDE 10 — STATIC MEMBERS
   ============================================ */
.static-visual { }
.static-diagram {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 10px; padding: 16px 20px;
  display: flex; flex-direction: column; gap: 10px;
}
.obj-box {
  background: var(--bg-card2); border: 1px solid var(--border);
  border-radius: 6px; padding: 8px 14px;
  font-family: var(--font-code); font-size: 12px; color: var(--text-secondary);
  display: inline-flex; align-items: center; gap: 10px;
}
.obj-box span { color: var(--text-muted); font-size: 11px; }
.shared-box {
  background: rgba(0,212,255,0.06); border: 1px solid var(--border-glow);
  border-radius: 8px; padding: 10px 16px;
  display: flex; flex-direction: column; gap: 4px;
}
.shared-label { font-family: var(--font-code); font-size: 13px; color: var(--cyan); font-weight: 700; }
.shared-sub   { font-size: 11px; color: var(--cyan-dim); }

/* ============================================
   SLIDE 11 — COMPLETE EXAMPLE
   ============================================ */
.full-code-layout {
  flex: 1; position: relative; z-index: 1;
  display: flex; flex-direction: column;
}
.full-code-layout .code-block { flex: 1; }
.full-code-layout .code-body { font-size: clamp(9px, 1vw, 12px); }

/* ============================================
   SLIDE 12 — SUMMARY
   ============================================ */
.summary-layout {
  flex: 1; position: relative; z-index: 1;
  display: flex; flex-direction: column; gap: 18px;
}
.summary-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}
.summary-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 10px; padding: 16px 18px;
  display: flex; flex-direction: column; gap: 6px;
  transition: border-color 0.2s, transform 0.2s;
}
.summary-card:hover {
  border-color: var(--cyan-dim); transform: translateY(-2px);
}
.summary-icon { font-size: 22px; }
.summary-title {
  font-family: var(--font-display); font-size: 14px; font-weight: 700;
  color: var(--text-primary);
}
.summary-desc { font-size: 12px; color: var(--text-muted); line-height: 1.5; }

.next-topics {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 10px; padding: 14px 20px;
  display: flex; align-items: center; gap: 16px; flex-wrap: wrap;
}
.next-title {
  font-family: var(--font-code); font-size: 12px; color: var(--cyan);
  font-weight: 700; white-space: nowrap;
}
.next-items { display: flex; gap: 8px; flex-wrap: wrap; }
.next-items span {
  background: var(--cyan-faint); border: 1px solid var(--border-glow);
  border-radius: 20px; padding: 4px 14px;
  font-size: 12px; color: var(--cyan); font-family: var(--font-code);
}

.end-tag {
  font-family: var(--font-code); font-size: 16px;
  color: var(--text-muted); text-align: center;
  padding: 8px;
}

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 4px; height: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

/* ── Keyboard shortcut hint ── */
@keyframes pulse {
  0%, 100% { opacity: 0.5; }
  50% { opacity: 1; }
}