@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+KR:wght@300;400;500;600;700;800&family=Outfit:wght@400;500;600;700;800&display=swap');

:root {
  --font-main: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-display: 'Outfit', 'Noto Sans KR', sans-serif;
  
  --bg-dark: #0f172a;
  --bg-dark-card: #1e293b;
  --bg-page: #f8fafc;
  --bg-card: #ffffff;
  --bg-subtle: #f1f5f9;
  
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #eff6ff;
  --primary-border: #bfdbfe;
  
  --accent: #10b981;
  --accent-hover: #059669;
  --accent-light: #ecfdf5;
  
  --text-main: #0f172a;
  --text-body: #334155;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  
  --border: #e2e8f0;
  --border-strong: #cbd5e1;
  
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.08);
  --shadow-md: 0 4px 12px -2px rgba(15, 23, 42, 0.12);
  --shadow-lg: 0 12px 32px -4px rgba(15, 23, 42, 0.12);
  --shadow-glow: 0 0 25px rgba(37, 99, 235, 0.18);
  
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  
  --nav-height: 64px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-main);
  background-color: var(--bg-page);
  color: var(--text-main);
  line-height: 1.6;
  overflow: hidden;
  height: 100vh;
  width: 100vw;
  -webkit-font-smoothing: antialiased;
}

/* App Header Bar */
.app-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(15, 23, 42, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  z-index: 100;
  color: #ffffff;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
  color: #ffffff;
  text-decoration: none;
}

.brand-badge {
  background: linear-gradient(135deg, #2563eb, #10b981);
  padding: 0.25rem 0.6rem;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.keyboard-hint {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: var(--text-light);
  background: rgba(255, 255, 255, 0.08);
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-sm);
}

.kbd-key {
  background: rgba(255, 255, 255, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.25);
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  font-family: monospace;
  font-size: 0.85rem;
  color: #ffffff;
  cursor: pointer;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}

.kbd-key:hover {
  background: rgba(37, 99, 235, 0.6);
  border-color: #38bdf8;
  transform: translateY(-1px);
}

.kbd-key:active {
  transform: translateY(0) scale(0.95);
}

.kbd-key:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: none;
}

/* Presentation Deck Wrapper */
.deck-container {
  width: 100vw;
  height: calc(100vh - var(--nav-height) - 60px);
  margin-top: var(--nav-height);
  position: relative;
  overflow: hidden;
}

.slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  padding: 2rem 3.5rem;
  opacity: 0;
  visibility: hidden;
  transform: translateX(60px) scale(0.98);
  transition: opacity 0.4s ease, transform 0.4s ease, visibility 0.4s;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

.slide.active {
  opacity: 1;
  visibility: visible;
  transform: translateX(0) scale(1);
  z-index: 10;
}

.slide.prev-slide {
  transform: translateX(-60px) scale(0.98);
}

/* Slide Header Elements */
.slide-header {
  margin-bottom: 1.5rem;
}

.slide-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--primary);
  background: var(--primary-light);
  padding: 0.3rem 0.8rem;
  border-radius: 20px;
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.slide-title {
  font-size: 2.1rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.02em;
  line-height: 1.25;
}

.slide-subtitle {
  font-size: 1.05rem;
  color: var(--text-muted);
  margin-top: 0.35rem;
}

/* Grid Layout Utilities */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: all 0.25s ease;
  position: relative;
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary-border);
}

.card-dark {
  background: var(--bg-dark);
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.1);
}

.card-accent {
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  border: 1px solid rgba(37, 99, 235, 0.3);
  color: #ffffff;
}

/* Slide 1: Cover */
.cover-layout {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 3rem;
  background: radial-gradient(circle at 80% 20%, rgba(37, 99, 235, 0.08) 0%, transparent 50%),
              radial-gradient(circle at 20% 80%, rgba(16, 185, 129, 0.06) 0%, transparent 50%);
  border-radius: var(--radius-xl);
  padding: 3.5rem;
  border: 1px solid var(--border);
  background-color: #ffffff;
}

.cover-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(37, 99, 235, 0.1);
  color: var(--primary);
  font-weight: 700;
  font-size: 0.9rem;
  padding: 0.4rem 1rem;
  border-radius: 30px;
  margin-bottom: 1.5rem;
}

.cover-title {
  font-size: 3.2rem;
  font-weight: 800;
  line-height: 1.15;
  color: var(--bg-dark);
  letter-spacing: -0.03em;
  margin-bottom: 1.25rem;
}

.cover-title span {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.cover-slogan {
  font-size: 1.25rem;
  color: var(--text-body);
  font-weight: 500;
  margin-bottom: 1.25rem;
}

.service-summary-box {
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.05), rgba(16, 185, 129, 0.05));
  border: 1px solid var(--primary-border);
  border-radius: var(--radius-md);
  padding: 1.1rem 1.25rem;
  margin-bottom: 1.25rem;
  box-shadow: var(--shadow-sm);
}

.summary-box-title {
  font-size: 0.92rem;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.summary-grid {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.summary-item {
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
}

.summary-icon {
  font-size: 1.1rem;
  line-height: 1.2;
  background: #ffffff;
  padding: 0.2rem 0.4rem;
  border-radius: 6px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
  flex-shrink: 0;
}

.summary-item strong {
  font-size: 0.88rem;
  color: var(--text-main);
  display: block;
  margin-bottom: 0.1rem;
}

.summary-item p {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.45;
}

.cover-meta {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

.meta-item {
  display: flex;
  flex-direction: column;
}

.meta-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.meta-val {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
}

.cover-hero-graphic {
  flex: 1;
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  border-radius: var(--radius-xl);
  padding: 2.5rem;
  color: #ffffff;
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  position: relative;
  overflow: hidden;
}

.hero-graphic-badge {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.slide-quick-nav {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  padding: 1rem;
}

.quick-nav-title {
  font-size: 0.85rem;
  color: #94a3b8;
  letter-spacing: 0.5px;
  margin-bottom: 0.75rem;
  font-weight: 700;
}

.quick-nav-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.4rem;
}

.quick-slide-btn {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-sm);
  padding: 0.45rem 0.55rem;
  color: #ffffff;
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  text-align: left;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  transition: all 0.2s ease;
  font-family: var(--font-main);
  white-space: nowrap;
}

.quick-slide-btn span {
  background: var(--primary);
  color: #ffffff;
  font-size: 0.7rem;
  font-weight: 800;
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
  font-family: var(--font-display);
  flex-shrink: 0;
}

.quick-slide-btn:hover {
  background: var(--primary);
  border-color: #38bdf8;
  transform: translateX(4px);
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.35);
}

.hero-demo-card {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  margin-bottom: 1rem;
}

.hero-demo-title {
  font-size: 0.85rem;
  color: var(--text-light);
  margin-bottom: 0.35rem;
}

.hero-demo-text {
  font-size: 1.05rem;
  font-weight: 600;
  color: #38bdf8;
}

/* Feature Icons */
.icon-box {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.35rem;
  margin-bottom: 0.85rem;
}

.icon-box.accent {
  background: var(--accent-light);
  color: var(--accent);
}

/* Flow Chart / Funnel */
.funnel-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 1rem;
}

.funnel-step {
  flex: 1;
  background: var(--bg-card);
  border: 2px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  text-align: center;
  position: relative;
  transition: all 0.3s ease;
  cursor: pointer;
}

.funnel-step:hover {
  transform: translateY(-4px);
  border-color: var(--primary-border);
  box-shadow: var(--shadow-md);
}

.funnel-step.highlight {
  border-color: var(--primary);
  background: var(--primary-light);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2), var(--shadow-md);
  transform: translateY(-4px);
}

.funnel-step.highlight .funnel-num {
  background: linear-gradient(135deg, var(--primary), var(--accent));
}

.funnel-num {
  width: 32px;
  height: 32px;
  background: var(--primary);
  color: #ffffff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  margin: 0 auto 0.75rem auto;
}

.funnel-arrow {
  font-size: 1.5rem;
  color: var(--text-light);
  font-weight: bold;
}

/* Persona Card */
.persona-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.persona-avatar {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: linear-gradient(135deg, #2563eb, #6366f1);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.35rem;
  font-weight: 700;
}

.persona-info h4 {
  font-size: 1.15rem;
  color: var(--text-main);
}

.persona-info p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 1rem;
}

.pill-tag {
  background: var(--bg-subtle);
  color: var(--text-body);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.25rem 0.65rem;
  border-radius: 20px;
  border: 1px solid var(--border);
}

/* Interactive Prototype: Doc Helper */
.interactive-layout {
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: 1.5rem;
  height: calc(100% - 80px);
}

.form-panel {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  overflow-y: auto;
  box-shadow: var(--shadow-sm);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.form-label {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-main);
}

.form-select, .form-input, .form-textarea {
  width: 100%;
  padding: 0.55rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  font-family: var(--font-main);
  font-size: 0.85rem;
  background-color: var(--bg-card);
  color: var(--text-main);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-select:focus, .form-input:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.tone-selector {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.4rem;
}

.tone-btn {
  padding: 0.45rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-body);
  cursor: pointer;
  text-align: center;
  transition: all 0.2s;
}

.tone-btn:hover {
  background: var(--bg-subtle);
}

.tone-btn.active {
  background: var(--primary-light);
  border-color: var(--primary);
  color: var(--primary);
}

.output-panel {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.output-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
}

.output-title-group {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.output-badge {
  background: var(--accent-light);
  color: var(--accent);
  font-weight: 700;
  font-size: 0.75rem;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
}

.output-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1.1rem;
  border-radius: var(--radius-md);
  font-size: 0.82rem;
  font-weight: 700;
  cursor: pointer;
  border: none;
  transition: all 0.2s;
}

.btn-primary {
  background: var(--primary);
  color: #ffffff;
}

.btn-primary:hover {
  background: var(--primary-hover);
  box-shadow: var(--shadow-sm);
}

.btn-outline {
  background: var(--bg-card);
  border: 1px solid var(--border-strong);
  color: var(--text-body);
}

.btn-outline:hover {
  background: var(--bg-subtle);
  border-color: var(--text-main);
}

.btn-sm {
  padding: 0.35rem 0.7rem;
  font-size: 0.78rem;
}

.quick-adjust-bar {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  margin-bottom: 0.85rem;
  background: var(--bg-subtle);
  padding: 0.4rem 0.6rem;
  border-radius: var(--radius-md);
}

.adjust-btn {
  background: #ffffff;
  border: 1px solid var(--border);
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-body);
  cursor: pointer;
  transition: all 0.15s;
}

.adjust-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.output-content {
  flex: 1;
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  font-family: var(--font-main);
  font-size: 0.9rem;
  line-height: 1.65;
  white-space: pre-wrap;
  color: var(--text-main);
  overflow-y: auto;
}

.notice-box {
  margin-top: 0.85rem;
  background: #fffbe6;
  border: 1px solid #ffe58f;
  padding: 0.6rem 0.85rem;
  border-radius: var(--radius-md);
  font-size: 0.78rem;
  color: #8c6b00;
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
}

/* Interactive Prototype: Calculator */
.calc-container {
  display: grid;
  grid-template-columns: 420px 1fr;
  gap: 1.5rem;
}

.calc-tabs {
  display: flex;
  gap: 0.4rem;
  margin-bottom: 1rem;
}

.calc-tab {
  flex: 1;
  padding: 0.55rem 0.4rem;
  text-align: center;
  font-size: 0.82rem;
  font-weight: 700;
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  cursor: pointer;
  color: var(--text-muted);
  transition: all 0.2s;
}

.calc-tab.active {
  background: var(--primary);
  color: #ffffff;
  border-color: var(--primary);
}

.calc-result-box {
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  color: #ffffff;
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  box-shadow: var(--shadow-lg);
}

.calc-result-label {
  font-size: 0.85rem;
  color: var(--text-light);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 0.5rem;
}

.calc-result-value {
  font-family: var(--font-display);
  font-size: 3.2rem;
  font-weight: 800;
  color: #38bdf8;
  margin-bottom: 0.5rem;
  line-height: 1.1;
}

.calc-result-detail {
  font-size: 0.88rem;
  color: #cbd5e1;
  background: rgba(255, 255, 255, 0.08);
  padding: 0.4rem 1.1rem;
  border-radius: 20px;
  margin-bottom: 1.25rem;
}

.rec-doc-card {
  margin-top: 1.25rem;
  width: 100%;
  background: rgba(255, 255, 255, 0.05);
  border: 1px dashed rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-md);
  padding: 1rem;
  text-align: left;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  transition: all 0.2s;
}

.rec-doc-card:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: #38bdf8;
}

.rec-doc-info h5 {
  font-size: 0.75rem;
  color: #94a3b8;
  text-transform: uppercase;
  margin-bottom: 0.2rem;
}

.rec-doc-info p {
  font-size: 0.88rem;
  font-weight: 700;
  color: #ffffff;
}

/* AdSense Placeholder */
.adsense-placeholder {
  background: #f1f5f9;
  border: 2px dashed #cbd5e1;
  border-radius: var(--radius-md);
  padding: 1.25rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.82rem;
  font-weight: 600;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  position: relative;
  min-height: 90px;
}

.adsense-badge {
  background: #cbd5e1;
  color: #475569;
  font-size: 0.68rem;
  padding: 0.12rem 0.45rem;
  border-radius: 4px;
  text-transform: uppercase;
}

/* Comparison Table */
.diff-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
}

.diff-table th, .diff-table td {
  padding: 0.85rem 1.1rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
  font-size: 0.85rem;
}

.diff-table th {
  background: var(--bg-dark);
  color: #ffffff;
  font-weight: 700;
}

.diff-table tr:last-child td {
  border-bottom: none;
}

.diff-table tr:hover td {
  background: var(--bg-subtle);
}

.highlight-cell {
  background: var(--primary-light);
  color: var(--primary);
  font-weight: 700;
}

/* Presentation Navigation Controls (Bottom Bar) */
.nav-controls {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 60px;
  background: #ffffff;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  z-index: 100;
}

.progress-bar-container {
  position: absolute;
  top: -3px;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--border);
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  width: 11.11%;
  transition: width 0.3s ease;
}

.nav-buttons {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.slide-counter {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--text-body);
}

.slide-counter span {
  color: var(--text-muted);
}

.dots-container {
  display: flex;
  gap: 0.4rem;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--border-strong);
  cursor: pointer;
  transition: all 0.25s;
}

.dot.active {
  background: var(--primary);
  width: 24px;
  border-radius: 10px;
}

.version-tag {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-muted);
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  padding: 0.2rem 0.55rem;
  border-radius: 12px;
  letter-spacing: 0.5px;
  user-select: none;
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: 80px;
  right: 2rem;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  pointer-events: none;
}

.toast {
  background: var(--bg-dark);
  color: #ffffff;
  padding: 0.65rem 1.1rem;
  border-radius: var(--radius-md);
  font-size: 0.82rem;
  font-weight: 600;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  animation: toastIn 0.3s ease forwards;
}

@keyframes toastIn {
  from { opacity: 0; transform: translateY(15px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Responsive adjustments */
@media (max-width: 1024px) {
  .slide { padding: 1.25rem; }
  .grid-2, .grid-3, .grid-4, .interactive-layout, .calc-container {
    grid-template-columns: 1fr;
  }
  .deck-container { height: auto; min-height: calc(100vh - 124px); overflow-y: auto; }
}

/* Print CSS */
@media print {
  body {
    overflow: visible !important;
    height: auto !important;
    background: #ffffff !important;
    color: #000000 !important;
  }
  .app-header, .nav-controls, .toast-container, .keyboard-hint {
    display: none !important;
  }
  .deck-container {
    margin-top: 0 !important;
    height: auto !important;
    overflow: visible !important;
  }
  .slide {
    position: relative !important;
    opacity: 1 !important;
    visibility: visible !important;
    transform: none !important;
    page-break-after: always !important;
    page-break-inside: avoid !important;
    padding: 2cm !important;
    height: auto !important;
    min-height: 100vh !important;
    display: block !important;
    border-bottom: 2px solid #e2e8f0;
  }
  .card, .form-panel, .output-panel, .calc-result-box {
    box-shadow: none !important;
    border: 1px solid #cbd5e1 !important;
  }
}