/* ========================================
   AI 启蒙之旅 — 全局样式
   ======================================== */

:root {
  --bg-dark: #0F0E17;
  --bg-card: #1A1929;
  --bg-card-hover: #232238;
  --primary: #5B4A8A;
  --primary-light: #7B6AAA;
  --accent: #E8A87C;
  --accent-warm: #F5C28A;
  --blue: #85C7DE;
  --purple: #C38EC7;
  --green: #90C695;
  --text: #FFFFFE;
  --text-dim: #A7A9BE;
  --text-muted: #72738C;
  --font-display: 'Playfair Display', 'Noto Serif SC', serif;
  --font-body: 'Noto Serif SC', Georgia, serif;
  --font-handwrite: 'Caveat', 'Ma Shan Zheng', cursive;
  --font-mono: 'SF Mono', 'Fira Code', monospace;
  --slide-padding: 4rem;
  --transition: 0.6s cubic-bezier(0.23, 1, 0.32, 1);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  overflow: hidden;
}

body {
  font-family: var(--font-body);
  background: var(--bg-dark);
  color: var(--text);
  overflow: hidden;
  height: 100vh;
  width: 100vw;
}

/* Noise texture overlay */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.03'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 9999;
  opacity: 0.4;
}

::selection {
  background: var(--accent);
  color: var(--bg-dark);
}

/* ========================================
   进度条
   ======================================== */
.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent), var(--blue));
  z-index: 1000;
  transition: width 0.5s ease;
  width: 0%;
}

/* ========================================
   语言切换
   ======================================== */
.lang-switcher {
  position: fixed;
  top: 1.5rem;
  right: 2rem;
  display: flex;
  gap: 0;
  z-index: 200;
  background: rgba(26, 25, 41, 0.8);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(91, 74, 138, 0.3);
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}

.lang-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  font-family: var(--font-body);
  letter-spacing: 0.05em;
  position: relative;
}

.lang-btn:not(:last-child)::after {
  content: '';
  position: absolute;
  right: 0;
  top: 25%;
  height: 50%;
  width: 1px;
  background: rgba(91, 74, 138, 0.3);
}

.lang-btn:hover {
  color: var(--text-dim);
  background: rgba(91, 74, 138, 0.15);
}

.lang-btn.active {
  color: var(--accent);
  background: rgba(232, 168, 124, 0.12);
}

/* ========================================
   导航
   ======================================== */
.slide-nav {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 0.75rem 1.5rem;
  background: rgba(26, 25, 41, 0.85);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(91, 74, 138, 0.3);
  border-radius: 50px;
  z-index: 100;
  transition: opacity 0.3s;
}

.nav-logo {
  font-family: var(--font-display);
  font-size: 0.85rem;
  color: var(--accent);
  white-space: nowrap;
  font-weight: 600;
  letter-spacing: 0.05em;
}

.nav-dots {
  display: flex;
  gap: 6px;
}

.nav-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-muted);
  cursor: pointer;
  transition: all 0.3s ease;
  border: none;
  padding: 0;
}

.nav-dot:hover {
  background: var(--text-dim);
  transform: scale(1.3);
}

.nav-dot.active {
  background: var(--accent);
  width: 24px;
  border-radius: 4px;
}

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

.nav-btn {
  background: rgba(91, 74, 138, 0.3);
  border: 1px solid rgba(91, 74, 138, 0.4);
  color: var(--text);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
}

.nav-btn:hover {
  background: var(--primary);
  transform: scale(1.1);
}

.slide-counter {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-dim);
  min-width: 50px;
  text-align: center;
}

/* ========================================
   幻灯片基础
   ======================================== */
.slide {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.8s ease, transform 0.8s ease;
  transform: translateY(30px);
  overflow-y: auto;
  overflow-x: hidden;
}

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

.slide.exit-up {
  opacity: 0;
  transform: translateY(-30px);
}

.slide.exit-down {
  opacity: 0;
  transform: translateY(30px);
}

.slide-inner {
  width: 100%;
  max-width: 1200px;
  margin: auto;
  padding: var(--slide-padding);
  padding-bottom: 6rem;
}

.slide-label {
  font-family: var(--font-display);
  font-size: 5rem;
  font-weight: 900;
  color: rgba(91, 74, 138, 0.12);
  position: absolute;
  top: 2rem;
  right: 3rem;
  line-height: 1;
  user-select: none;
}

.slide-title {
  font-family: var(--font-display);
  font-size: 2.8rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  background: linear-gradient(135deg, var(--text), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.3;
}

.slide-subtitle-text {
  font-size: 1.15rem;
  color: var(--text-dim);
  margin-bottom: 2rem;
  font-style: italic;
}

/* ========================================
   封面
   ======================================== */
.slide-cover {
  background: radial-gradient(ellipse at 30% 50%, rgba(91, 74, 138, 0.3) 0%, transparent 60%),
              radial-gradient(ellipse at 70% 50%, rgba(232, 168, 124, 0.15) 0%, transparent 50%),
              var(--bg-dark);
}

/* Cover floating shapes */
.slide-cover::after {
  content: '';
  position: absolute;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(232, 168, 124, 0.08) 0%, transparent 70%);
  border-radius: 50%;
  top: 10%;
  right: 10%;
  animation: floatBlob 8s ease-in-out infinite;
  pointer-events: none;
}

@keyframes floatBlob {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(20px, -30px) scale(1.1); }
  66% { transform: translate(-15px, 15px) scale(0.95); }
}

.cover-bg-art {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.cover-circuit {
  width: 100%;
  height: 100%;
}

.cover-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 800px;
  padding: 2rem;
}

.cover-subtitle {
  font-family: var(--font-handwrite);
  font-size: 1.5rem;
  color: var(--accent);
  margin-bottom: 1rem;
  letter-spacing: 0.1em;
}

.cover-title {
  margin-bottom: 1.5rem;
}

.title-line {
  display: block;
  font-family: var(--font-display);
  font-size: 5.5rem;
  font-weight: 900;
  line-height: 1.1;
  color: var(--text);
}

.title-line.accent {
  background: linear-gradient(135deg, var(--accent), var(--purple), var(--blue));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.cover-desc {
  font-size: 1.2rem;
  color: var(--text-dim);
  margin-bottom: 2.5rem;
  line-height: 1.7;
}

.cover-quote {
  margin-bottom: 3rem;
  padding: 1.5rem 2rem;
  border-left: 3px solid var(--primary-light);
  background: rgba(91, 74, 138, 0.1);
  border-radius: 0 12px 12px 0;
  text-align: left;
}

.cover-quote p {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.1rem;
  color: var(--text-dim);
  margin-bottom: 0.5rem;
}

.cover-quote cite {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.start-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 2.5rem;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border: none;
  border-radius: 50px;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 1.1rem;
  cursor: pointer;
  transition: all 0.4s ease;
  box-shadow: 0 4px 20px rgba(91, 74, 138, 0.4);
}

.start-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(91, 74, 138, 0.6);
}

.start-btn:active {
  transform: translateY(-1px);
}

/* ========================================
   两栏布局
   ======================================== */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 3rem;
  align-items: center;
  margin-top: 1.5rem;
}

.col-left, .col-right {
  min-width: 0;
}

/* ========================================
   手绘风格图
   ======================================== */
.sketch-box {
  background: rgba(255, 255, 255, 0.03);
  border: 1px dashed rgba(91, 74, 138, 0.3);
  border-radius: 16px;
  padding: 1.5rem;
  position: relative;
}

.sketch-svg {
  width: 100%;
  height: auto;
}

.sketch-label {
  font-family: var(--font-handwrite);
  font-size: 16px;
}

.sketch-label-sm {
  font-family: var(--font-handwrite);
  font-size: 13px;
}

/* ========================================
   内容块
   ======================================== */
.content-block {
  padding: 0 1rem;
}

.lead-text {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 1rem;
  line-height: 1.6;
}

.content-block p {
  color: var(--text-dim);
  line-height: 1.8;
  margin-bottom: 1rem;
}

.key-points {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 1.5rem;
}

.key-point {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1rem;
  background: rgba(91, 74, 138, 0.08);
  border-radius: 12px;
  transition: all 0.3s ease;
}

.key-point:hover {
  background: rgba(91, 74, 138, 0.15);
  transform: translateX(5px);
}

.point-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
}

.key-point strong {
  display: block;
  color: var(--text);
  margin-bottom: 0.25rem;
}

.key-point p {
  color: var(--text-dim);
  font-size: 0.9rem;
  margin: 0;
}

/* ========================================
   引用横幅
   ======================================== */
.quote-banner {
  padding: 1.5rem 2rem;
  background: linear-gradient(135deg, rgba(91, 74, 138, 0.15), rgba(232, 168, 124, 0.08));
  border-left: 3px solid var(--accent);
  border-radius: 0 12px 12px 0;
  margin-bottom: 2rem;
}

.quote-banner p {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.15rem;
  color: var(--text-dim);
  margin-bottom: 0.5rem;
}

.quote-banner cite {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-style: normal;
}

.quote-banner.small {
  padding: 1rem 1.5rem;
}

.quote-banner.small p {
  font-size: 1rem;
}

/* ========================================
   时间线 (Slide 2)
   ======================================== */
.timeline {
  position: relative;
  display: flex;
  gap: 0;
  justify-content: space-between;
  padding: 3rem 0 1rem;
  overflow-x: auto;
}

.timeline-line {
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transform: translateY(-50%);
}

.timeline-item {
  position: relative;
  flex: 1;
  min-width: 150px;
  text-align: center;
  padding: 0 0.5rem;
}

.timeline-year {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 1rem;
  position: relative;
}

.timeline-year::after {
  content: '';
  position: absolute;
  bottom: -0.75rem;
  left: 50%;
  transform: translateX(-50%);
  width: 12px;
  height: 12px;
  background: var(--primary);
  border: 2px solid var(--accent);
  border-radius: 50%;
}

.timeline-card {
  background: var(--bg-card);
  border: 1px solid rgba(91, 74, 138, 0.2);
  border-radius: 12px;
  padding: 1rem;
  margin-top: 1.5rem;
  transition: all 0.3s ease;
}

.timeline-card:hover {
  border-color: var(--primary-light);
  transform: translateY(-5px);
  box-shadow: 0 8px 25px rgba(91, 74, 138, 0.2);
}

.timeline-card h4 {
  font-size: 0.95rem;
  color: var(--text);
  margin-bottom: 0.5rem;
}

.timeline-card p {
  font-size: 0.8rem;
  color: var(--text-dim);
  line-height: 1.5;
}

.timeline-card.highlight {
  border-color: var(--accent);
  background: rgba(232, 168, 124, 0.08);
}

.timeline-card.highlight::before {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: 12px;
  padding: 1px;
  background: linear-gradient(135deg, var(--accent), var(--purple));
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}

/* ========================================
   特性卡片 (Slide 3 - LLM)
   ======================================== */
.feature-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin: 1.5rem 0;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid rgba(91, 74, 138, 0.15);
  border-radius: 12px;
  padding: 1.2rem;
  text-align: center;
  transition: all 0.3s ease;
}

.feature-card:hover {
  border-color: var(--primary-light);
  transform: translateY(-3px);
}

.feature-icon {
  font-size: 1.8rem;
  margin-bottom: 0.5rem;
}

.feature-card h4 {
  font-size: 0.95rem;
  margin-bottom: 0.3rem;
}

.feature-card p {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin: 0;
}

.tip-box {
  background: rgba(232, 168, 124, 0.1);
  border: 1px solid rgba(232, 168, 124, 0.2);
  border-radius: 10px;
  padding: 1rem 1.2rem;
  font-size: 0.9rem;
  color: var(--text-dim);
  line-height: 1.6;
}

.tip-box strong {
  color: var(--accent);
}

/* ========================================
   Prompt 演示 (Slide 4)
   ======================================== */
.prompt-demo {
  margin-top: 1rem;
}

.prompt-comparison {
  display: flex;
  align-items: stretch;
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}

.prompt-arrow {
  display: flex;
  align-items: center;
  font-size: 2rem;
  color: var(--accent);
  flex-shrink: 0;
}

.prompt-card {
  flex: 1;
  background: var(--bg-card);
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid rgba(91, 74, 138, 0.15);
}

.prompt-card-header {
  padding: 0.8rem 1.2rem;
  font-weight: 600;
  font-size: 0.9rem;
}

.prompt-card.bad .prompt-card-header {
  background: rgba(220, 80, 80, 0.15);
  color: #E88;
}

.prompt-card.good .prompt-card-header {
  background: rgba(144, 198, 149, 0.15);
  color: var(--green);
}

.prompt-input {
  padding: 1rem 1.2rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text);
  background: rgba(0, 0, 0, 0.2);
  border-bottom: 1px solid rgba(91, 74, 138, 0.1);
  line-height: 1.6;
}

.prompt-result {
  padding: 1rem 1.2rem;
}

.prompt-result p {
  font-size: 0.85rem;
  color: var(--text-dim);
  line-height: 1.6;
}

.prompt-tips {
  background: rgba(91, 74, 138, 0.06);
  border-radius: 16px;
  padding: 2rem;
}

.prompt-tips h3 {
  text-align: center;
  margin-bottom: 1.5rem;
}

.handwrite {
  font-family: var(--font-handwrite);
  font-size: 1.8rem;
  color: var(--accent);
}

.tips-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.tip-item {
  text-align: center;
  padding: 1.5rem 1rem;
  background: var(--bg-card);
  border-radius: 12px;
  border: 1px solid rgba(91, 74, 138, 0.15);
  transition: all 0.3s ease;
}

.tip-item:hover {
  border-color: var(--accent);
  transform: translateY(-5px);
}

.tip-number {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1rem;
  font-weight: 700;
  font-size: 1rem;
}

.tip-item h4 {
  margin-bottom: 0.5rem;
  color: var(--text);
}

.tip-item p {
  font-size: 0.85rem;
  color: var(--text-dim);
  line-height: 1.5;
}

.tip-item em {
  color: var(--accent);
  font-size: 0.8rem;
}

/* ========================================
   RAG 流程 (Slide 5)
   ======================================== */
.rag-visual {
  margin-top: 1rem;
}

.rag-flow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.3rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
  padding: 2rem 1rem;
  background: rgba(91, 74, 138, 0.05);
  border-radius: 16px;
}

.rag-step {
  text-align: center;
  padding: 1rem;
  min-width: 120px;
  background: var(--bg-card);
  border-radius: 12px;
  border: 1px solid rgba(91, 74, 138, 0.2);
  transition: all 0.3s ease;
}

.rag-step:hover {
  transform: translateY(-3px);
  border-color: var(--primary-light);
}

.rag-step.highlight-step {
  border-color: var(--accent);
  background: rgba(232, 168, 124, 0.1);
}

.rag-icon {
  font-size: 1.8rem;
  margin-bottom: 0.5rem;
}

.rag-label {
  font-weight: 600;
  font-size: 0.85rem;
  margin-bottom: 0.3rem;
}

.rag-desc {
  font-size: 0.75rem;
  color: var(--text-dim);
  line-height: 1.4;
}

.rag-connector {
  flex-shrink: 0;
}

.rag-why h3 {
  font-family: var(--font-display);
  font-size: 1.3rem;
  margin-bottom: 1rem;
  color: var(--accent);
}

.rag-comparison {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.rag-comp-item {
  padding: 1.2rem;
  background: var(--bg-card);
  border-radius: 12px;
}

.comp-header {
  padding: 0.5rem 1rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 0.8rem;
  display: inline-block;
}

.comp-header.bad-bg {
  background: rgba(220, 80, 80, 0.15);
  color: #E88;
}

.comp-header.good-bg {
  background: rgba(144, 198, 149, 0.15);
  color: var(--green);
}

.rag-comp-item p {
  font-size: 0.9rem;
  color: var(--text-dim);
  line-height: 1.6;
}

/* ========================================
   知识库 (Slide 6)
   ======================================== */
.kb-visual {
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  gap: 3rem;
  align-items: center;
  margin-top: 1rem;
}

.kb-center {
  position: relative;
  width: 300px;
  height: 300px;
  margin: 0 auto;
}

.kb-brain {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 100px;
  height: 100px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 2;
  box-shadow: 0 0 40px rgba(91, 74, 138, 0.4);
}

.kb-brain span {
  font-size: 2rem;
}

.kb-brain p {
  font-size: 0.7rem;
  color: var(--text);
  margin-top: 0.2rem;
}

.kb-orbits {
  position: absolute;
  inset: 0;
}

.kb-orbit-item {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 70px;
  height: 70px;
  background: var(--bg-card);
  border: 1px solid rgba(91, 74, 138, 0.3);
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transform: translate(-50%, -50%) rotate(var(--angle)) translateY(-120px) rotate(calc(-1 * var(--angle)));
  transition: all 0.3s ease;
  animation: orbit-float 3s ease-in-out infinite;
  animation-delay: var(--delay);
}

.kb-orbit-item:hover {
  border-color: var(--accent);
  transform: translate(-50%, -50%) rotate(var(--angle)) translateY(-125px) rotate(calc(-1 * var(--angle))) scale(1.1);
}

.kb-orbit-item span {
  font-size: 1.3rem;
}

.kb-orbit-item p {
  font-size: 0.65rem;
  color: var(--text-dim);
  margin-top: 0.2rem;
}

@keyframes orbit-float {
  0%, 100% { opacity: 0.8; }
  50% { opacity: 1; }
}

.kb-scenarios h3 {
  font-family: var(--font-display);
  font-size: 1.3rem;
  color: var(--accent);
  margin-bottom: 1rem;
}

.scenario-cards {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.scenario-card {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1rem;
  background: var(--bg-card);
  border-radius: 12px;
  border: 1px solid rgba(91, 74, 138, 0.15);
  transition: all 0.3s ease;
}

.scenario-card:hover {
  border-color: var(--primary-light);
  transform: translateX(5px);
}

.scenario-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
}

.scenario-card h4 {
  font-size: 0.95rem;
  margin-bottom: 0.3rem;
}

.scenario-card p {
  font-size: 0.85rem;
  color: var(--text-dim);
  line-height: 1.5;
}

/* ========================================
   MCP (Slide 7)
   ======================================== */
.mcp-visual {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  margin-top: 1rem;
  align-items: center;
}

.mcp-diagram {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  align-items: center;
}

.mcp-layer {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  justify-content: center;
}

.mcp-tool-item {
  padding: 0.6rem 1rem;
  background: var(--bg-card);
  border: 1px solid rgba(91, 74, 138, 0.2);
  border-radius: 8px;
  font-size: 0.8rem;
  transition: all 0.3s ease;
}

.mcp-tool-item:hover {
  border-color: var(--blue);
  transform: translateY(-2px);
}

.mcp-connector-zone {
  width: 100%;
  display: flex;
  justify-content: center;
  position: relative;
  padding: 1rem 0;
}

.mcp-connector-zone::before,
.mcp-connector-zone::after {
  content: '';
  position: absolute;
  left: 50%;
  width: 2px;
  height: 1rem;
  background: var(--primary);
  transform: translateX(-50%);
}

.mcp-connector-zone::before { top: 0; }
.mcp-connector-zone::after { bottom: 0; }

.mcp-protocol-box {
  background: linear-gradient(135deg, rgba(91, 74, 138, 0.3), rgba(232, 168, 124, 0.2));
  border: 2px solid var(--primary);
  border-radius: 12px;
  padding: 1rem 2rem;
  text-align: center;
}

.mcp-protocol-box span {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--accent);
}

.mcp-protocol-box p {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-top: 0.3rem;
}

.mcp-ai-box {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: 16px;
  padding: 1.5rem 3rem;
  text-align: center;
  box-shadow: 0 4px 20px rgba(91, 74, 138, 0.3);
}

.mcp-ai-box span {
  font-size: 2rem;
}

.mcp-ai-box p {
  color: var(--text);
  font-weight: 600;
  margin-top: 0.3rem;
}

.mcp-explain .lead-text {
  margin-top: 0;
}

.mcp-explain p {
  color: var(--text-dim);
  line-height: 1.8;
  margin-bottom: 1rem;
}

.mcp-benefits {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 1.5rem;
}

.benefit-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 0.8rem;
  background: rgba(91, 74, 138, 0.06);
  border-radius: 10px;
}

.benefit-icon {
  font-size: 1.3rem;
  flex-shrink: 0;
}

.benefit-item strong {
  display: block;
  margin-bottom: 0.2rem;
}

.benefit-item p {
  font-size: 0.85rem;
  color: var(--text-dim);
  margin: 0;
}

/* ========================================
   Skills (Slide 8)
   ======================================== */
.skills-visual {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 3rem;
  align-items: center;
  margin-top: 1.5rem;
}

.skills-content .lead-text {
  margin-top: 0;
}

.skills-content p {
  color: var(--text-dim);
  line-height: 1.8;
  margin-bottom: 1rem;
}

.skills-examples {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  margin: 1.5rem 0;
}

.skill-example-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.8rem 1rem;
  background: var(--bg-card);
  border-radius: 10px;
  border: 1px solid rgba(91, 74, 138, 0.15);
  transition: all 0.3s ease;
}

.skill-example-item:hover {
  border-color: var(--accent);
  transform: translateX(5px);
}

.skill-tag {
  background: rgba(91, 74, 138, 0.2);
  padding: 0.3rem 0.8rem;
  border-radius: 6px;
  font-size: 0.8rem;
  white-space: nowrap;
  font-weight: 600;
}

.skill-example-item p {
  font-size: 0.85rem;
  color: var(--text-dim);
  margin: 0;
}

/* ========================================
   Agent (Slide 9)
   ======================================== */
.agent-visual {
  margin-top: 1rem;
}

.agent-comparison {
  display: flex;
  gap: 2rem;
  align-items: stretch;
  margin-bottom: 2rem;
}

.vs-badge {
  display: flex;
  align-items: center;
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--accent);
  flex-shrink: 0;
}

.agent-card {
  flex: 1;
  background: var(--bg-card);
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid rgba(91, 74, 138, 0.15);
}

.agent-card.highlight-card {
  border-color: var(--accent);
  box-shadow: 0 4px 25px rgba(232, 168, 124, 0.15);
}

.agent-card-header {
  padding: 1rem 1.5rem;
  background: rgba(91, 74, 138, 0.1);
  font-weight: 600;
  font-size: 1rem;
}

.highlight-card .agent-card-header {
  background: rgba(232, 168, 124, 0.1);
  color: var(--accent);
}

.agent-card-body {
  padding: 1.5rem;
}

.chat-bubble {
  padding: 0.8rem 1rem;
  border-radius: 12px;
  margin-bottom: 0.8rem;
  font-size: 0.85rem;
  line-height: 1.5;
  max-width: 90%;
}

.chat-bubble.user {
  background: rgba(91, 74, 138, 0.2);
  border: 1px solid rgba(91, 74, 138, 0.3);
  margin-left: auto;
  border-bottom-right-radius: 4px;
}

.chat-bubble.ai {
  background: rgba(133, 199, 222, 0.1);
  border: 1px solid rgba(133, 199, 222, 0.2);
  border-bottom-left-radius: 4px;
}

.chat-bubble.ai.thinking {
  opacity: 0.7;
  font-style: italic;
}

.agent-verdict {
  text-align: center;
  font-weight: 600;
  margin-top: 1rem;
  font-size: 0.95rem;
}

.agent-features {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.agent-feature {
  text-align: center;
  padding: 1.5rem 1rem;
  background: var(--bg-card);
  border-radius: 12px;
  border: 1px solid rgba(91, 74, 138, 0.15);
  transition: all 0.3s ease;
}

.agent-feature:hover {
  border-color: var(--accent);
  transform: translateY(-5px);
}

.agent-feature span {
  font-size: 2rem;
  display: block;
  margin-bottom: 0.8rem;
}

.agent-feature h4 {
  margin-bottom: 0.3rem;
  font-size: 0.95rem;
}

.agent-feature p {
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* ========================================
   AI Development Evolution (Slide 10)
   ======================================== */
.slide-harness .quote-banner {
  padding: 0.6rem 1.2rem;
  margin-bottom: 0.8rem;
}

.paradigm-evolution {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  gap: 0.8rem;
  align-items: stretch;
  margin-bottom: 1rem;
}

.paradigm-card {
  background: var(--bg-card);
  border: 1px solid rgba(91, 74, 138, 0.2);
  border-radius: 14px;
  padding: 1.2rem;
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
}

.paradigm-card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

.paradigm-vibe { border-top: 3px solid #E8A87C; }
.paradigm-context { border-top: 3px solid #85C7DE; }
.paradigm-harness { border-top: 3px solid #C38EC7; }

.paradigm-header {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.6rem;
}

.paradigm-icon {
  font-size: 1.8rem;
  flex-shrink: 0;
}

.paradigm-header h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  color: var(--text);
  margin: 0;
  line-height: 1.2;
}

.paradigm-era {
  font-size: 0.7rem;
  color: var(--text-muted);
  font-style: italic;
}

.paradigm-tagline {
  font-size: 0.8rem;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 0.5rem;
  font-style: italic;
}

.paradigm-desc {
  font-size: 0.78rem;
  color: var(--text-dim);
  line-height: 1.6;
  margin-bottom: 0.6rem;
  flex: 1;
}

.paradigm-traits {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.trait {
  font-size: 0.72rem;
  color: var(--text-dim);
  padding: 0.25rem 0.5rem;
  background: rgba(91, 74, 138, 0.08);
  border-radius: 6px;
  white-space: nowrap;
}

.paradigm-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--primary-light);
  font-weight: bold;
  opacity: 0.6;
}

.paradigm-summary {
  background: rgba(232, 168, 124, 0.06);
  border: 1px solid rgba(232, 168, 124, 0.15);
  border-radius: 12px;
  padding: 1rem 1.2rem;
}

.paradigm-summary p {
  font-size: 0.85rem;
  color: var(--text-dim);
  line-height: 1.7;
  margin: 0;
}

/* ========================================
/* ========================================
   Open Claw (Slide 11)
   ======================================== */
.slide-openclaw .quote-banner {
  padding: 0.8rem 1.5rem;
  margin-bottom: 0.8rem;
}

.slide-openclaw .quote-banner p {
  font-size: 1rem;
  margin-bottom: 0.3rem;
}

.openclaw-content {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 1.5rem;
  align-items: start;
  margin-top: 0.5rem;
}

.openclaw-visual {
  position: relative;
  width: 280px;
  height: 280px;
  flex-shrink: 0;
}

.claw-center {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  z-index: 2;
}

.claw-logo {
  font-size: 2.5rem;
  animation: claw-pulse 2s ease-in-out infinite;
}

@keyframes claw-pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.1); }
}

.claw-center p {
  font-weight: 700;
  color: var(--accent);
  font-size: 0.85rem;
  margin-top: 0.2rem;
}

.claw-branches {
  position: absolute;
  inset: 0;
}

.claw-branch {
  position: absolute;
  top: 50%;
  left: 50%;
  transform-origin: center;
}

/* 使用 translate(-50%, -50%) 居中节点，避免重叠 */
.branch-node {
  position: absolute;
  transform: rotate(var(--branch-angle)) translateY(-120px) rotate(calc(-1 * var(--branch-angle))) translate(-50%, -50%);
  background: var(--bg-card);
  border: 1px solid rgba(91, 74, 138, 0.3);
  border-radius: 8px;
  padding: 0.3rem 0.6rem;
  font-size: 0.7rem;
  white-space: nowrap;
  transition: all 0.3s ease;
}

.branch-node:hover {
  border-color: var(--accent);
  transform: rotate(var(--branch-angle)) translateY(-124px) rotate(calc(-1 * var(--branch-angle))) translate(-50%, -50%) scale(1.05);
}

.openclaw-desc {
  position: relative;
  z-index: 2;
}

.openclaw-desc .lead-text {
  margin-top: 0;
  font-size: 1rem;
}

.openclaw-desc p {
  color: var(--text-dim);
  line-height: 1.6;
  margin-bottom: 0.5rem;
  font-size: 0.85rem;
}

.openclaw-features {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-top: 0.8rem;
}

.oc-feature {
  padding: 0.6rem 0.8rem;
  background: var(--bg-card);
  border-radius: 10px;
  border: 1px solid rgba(91, 74, 138, 0.15);
}

.oc-feature strong {
  color: var(--text);
  display: block;
  margin-bottom: 0.2rem;
  font-size: 0.85rem;
}

.oc-feature p {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin: 0;
}

/* ========================================
   实战场景 (Slide 12)
   ======================================== */
.practice-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: 1rem;
}

.practice-card {
  background: var(--bg-card);
  border: 1px solid rgba(91, 74, 138, 0.15);
  border-radius: 16px;
  padding: 1.5rem;
  transition: all 0.4s ease;
}

.practice-card:hover {
  border-color: var(--accent);
  transform: translateY(-5px);
  box-shadow: 0 8px 30px rgba(91, 74, 138, 0.2);
}

.practice-icon {
  font-size: 2rem;
  margin-bottom: 0.8rem;
}

.practice-card h4 {
  margin-bottom: 1rem;
  font-size: 1.05rem;
}

.practice-before-after {
  margin-bottom: 1rem;
}

.before, .after {
  font-size: 0.85rem;
  padding: 0.5rem 0;
  line-height: 1.5;
}

.before {
  color: var(--text-muted);
  text-decoration: line-through;
  opacity: 0.7;
}

.after {
  color: var(--text-dim);
}

.time-saved {
  font-weight: 700;
  color: var(--green);
  font-size: 0.95rem;
  padding: 0.5rem;
  background: rgba(144, 198, 149, 0.1);
  border-radius: 8px;
  text-align: center;
}

/* ========================================
   如何开始 (Slide 13)
   ======================================== */
.start-roadmap {
  margin-top: 2rem;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.roadmap-path {
  display: flex;
  flex-direction: column;
  gap: 0;
  position: relative;
}

.roadmap-path::before {
  content: '';
  position: absolute;
  left: 24px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--primary), var(--accent), var(--green));
}

.roadmap-step {
  display: flex;
  gap: 1.5rem;
  padding: 1.5rem 0;
  position: relative;
}

.step-marker {
  width: 50px;
  height: 50px;
  background: var(--bg-card);
  border: 2px solid var(--primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  flex-shrink: 0;
  z-index: 1;
}

.step-content {
  flex: 1;
  background: var(--bg-card);
  border: 1px solid rgba(91, 74, 138, 0.15);
  border-radius: 12px;
  padding: 1.5rem;
}

.step-content h4 {
  color: var(--accent);
  margin-bottom: 0.5rem;
  font-size: 1.1rem;
}

.step-content p {
  color: var(--text-dim);
  line-height: 1.7;
  font-size: 0.9rem;
  margin-bottom: 0.8rem;
}

.step-action {
  background: rgba(232, 168, 124, 0.1);
  border-radius: 8px;
  padding: 0.8rem 1rem;
  font-size: 0.85rem;
  color: var(--accent);
}

/* ========================================
   误区 (Slide 14)
   ======================================== */
.myths-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-top: 1rem;
}

.myth-card {
  background: var(--bg-card);
  border: 1px solid rgba(91, 74, 138, 0.15);
  border-radius: 16px;
  overflow: hidden;
  transition: all 0.3s ease;
}

.myth-card:hover {
  border-color: var(--primary-light);
  transform: translateY(-3px);
}

.myth-header {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  padding: 1rem 1.5rem;
  background: rgba(220, 80, 80, 0.08);
}

.myth-x {
  color: #E88;
  font-size: 1.2rem;
  font-weight: 700;
}

.myth-header h4 {
  font-size: 1rem;
  color: var(--text-dim);
}

.myth-truth {
  display: flex;
  align-items: flex-start;
  gap: 0.8rem;
  padding: 1.2rem 1.5rem;
}

.myth-check {
  color: var(--green);
  font-size: 1.2rem;
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 0.1rem;
}

.myth-truth p {
  font-size: 0.9rem;
  color: var(--text-dim);
  line-height: 1.6;
}

/* ========================================
   总结表格 (Slide 15)
   ======================================== */
.summary-table-wrap {
  margin-top: 1.5rem;
  overflow-x: auto;
}

.summary-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  background: var(--bg-card);
  border-radius: 16px;
  overflow: hidden;
}

.summary-table thead {
  background: rgba(91, 74, 138, 0.2);
}

.summary-table th {
  padding: 1rem 1.2rem;
  text-align: left;
  font-size: 0.9rem;
  color: var(--accent);
  font-weight: 600;
  border-bottom: 1px solid rgba(91, 74, 138, 0.2);
}

.summary-table td {
  padding: 0.9rem 1.2rem;
  font-size: 0.88rem;
  color: var(--text-dim);
  border-bottom: 1px solid rgba(91, 74, 138, 0.08);
  line-height: 1.5;
}

.summary-table tbody tr {
  transition: all 0.3s ease;
}

.summary-table tbody tr:hover {
  background: rgba(91, 74, 138, 0.08);
}

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

.summary-table td strong {
  color: var(--text);
}

/* ========================================
   结尾 (Slide 16)
   ======================================== */
.slide-ending {
  background: radial-gradient(ellipse at 50% 50%, rgba(91, 74, 138, 0.25) 0%, transparent 70%),
              var(--bg-dark);
}

.ending-inner {
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  min-height: 100vh;
}

.ending-content {
  position: relative;
  z-index: 2;
  max-width: 700px;
}

.ending-pre {
  font-family: var(--font-handwrite);
  font-size: 1.5rem;
  color: var(--text-dim);
  margin-bottom: 1rem;
}

.ending-title {
  font-family: var(--font-display);
  font-size: 4rem;
  font-weight: 900;
  margin-bottom: 2rem;
  line-height: 1.2;
}

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

.ending-quote {
  padding: 1.5rem 2rem;
  border-left: 3px solid var(--accent);
  background: rgba(91, 74, 138, 0.1);
  border-radius: 0 12px 12px 0;
  text-align: left;
  margin-bottom: 2.5rem;
}

.ending-quote p {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.1rem;
  color: var(--text-dim);
  margin-bottom: 0.5rem;
}

.ending-quote cite {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-style: normal;
}

.ending-cta p {
  color: var(--text-dim);
  margin-bottom: 1.5rem;
  font-size: 1.1rem;
}

.ending-links {
  display: flex;
  gap: 1rem;
  justify-content: center;
}

.ending-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.8rem 2rem;
  border-radius: 50px;
  text-decoration: none;
  font-size: 1rem;
  transition: all 0.3s ease;
  border: 1px solid rgba(91, 74, 138, 0.4);
  color: var(--text-dim);
}

.ending-link:hover {
  border-color: var(--accent);
  color: var(--text);
  transform: translateY(-2px);
}

.ending-link.primary {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border: none;
  color: var(--text);
  box-shadow: 0 4px 20px rgba(91, 74, 138, 0.4);
}

.ending-link.primary:hover {
  box-shadow: 0 8px 30px rgba(91, 74, 138, 0.6);
}

.ending-particles {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

/* ========================================
   键盘提示
   ======================================== */
.keyboard-hint {
  position: fixed;
  bottom: 6rem;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(26, 25, 41, 0.7);
  padding: 0.5rem 1.5rem;
  border-radius: 20px;
  font-size: 0.8rem;
  color: var(--text-muted);
  z-index: 50;
  transition: opacity 0.5s ease;
  backdrop-filter: blur(10px);
}

.keyboard-hint.hidden {
  opacity: 0;
  pointer-events: none;
}

/* ========================================
   动画
   ======================================== */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.fade-up {
  opacity: 0;
  animation: fadeUp 0.8s ease forwards;
}

.fade-up.delay-1 { animation-delay: 0.2s; }
.fade-up.delay-2 { animation-delay: 0.4s; }
.fade-up.delay-3 { animation-delay: 0.6s; }
.fade-up.delay-4 { animation-delay: 0.8s; }

.slide.active .fade-up {
  animation: fadeUp 0.8s ease forwards;
}

@keyframes fadeInRight {
  from { opacity: 0; transform: translateX(30px); }
  to { opacity: 1; transform: translateX(0); }
}

.fade-in-right {
  opacity: 0;
}

.slide.active .fade-in-right {
  animation: fadeInRight 0.8s ease 0.3s forwards;
}

/* Hand draw animation */
@keyframes handDraw {
  from { stroke-dashoffset: 1000; }
  to { stroke-dashoffset: 0; }
}

.hand-draw {
  stroke-dasharray: 1000;
  stroke-dashoffset: 1000;
}

.slide.active .hand-draw {
  animation: handDraw 2s ease forwards;
}

.slide.active .hand-draw.delay-1 { animation-delay: 0.3s; }
.slide.active .hand-draw.delay-2 { animation-delay: 0.6s; }
.slide.active .hand-draw.delay-3 { animation-delay: 0.9s; }

/* Blink animation */
@keyframes blink {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 1; }
}

.blink {
  animation: blink 2s ease-in-out infinite;
}

.blink.delay-1 { animation-delay: 0.5s; }
.blink.delay-2 { animation-delay: 1s; }
.blink.delay-3 { animation-delay: 1.5s; }

/* Pulse circle */
@keyframes pulseCircle {
  0% { transform: scale(1); opacity: 0.05; }
  50% { transform: scale(1.05); opacity: 0.1; }
  100% { transform: scale(1); opacity: 0.05; }
}

.pulse-circle {
  animation: pulseCircle 4s ease-in-out infinite;
}

.pulse-circle.delay-2 { animation-delay: 2s; }

/* Draw path */
@keyframes drawPath {
  from { stroke-dashoffset: 2000; }
  to { stroke-dashoffset: 0; }
}

.draw-path {
  stroke-dasharray: 2000;
  stroke-dashoffset: 2000;
  animation: drawPath 4s ease forwards;
}

.draw-path.delay-1 { animation-delay: 1s; }

/* Float card */
@keyframes floatCard {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-5px); }
}

.float-card {
  animation: floatCard 3s ease-in-out infinite;
}

.float-card.delay-1 { animation-delay: 0.5s; }
.float-card.delay-2 { animation-delay: 1s; }
.float-card.delay-3 { animation-delay: 1.5s; }

/* ========================================
   滚动条
   ======================================== */
.slide::-webkit-scrollbar {
  width: 4px;
}

.slide::-webkit-scrollbar-track {
  background: transparent;
}

.slide::-webkit-scrollbar-thumb {
  background: rgba(91, 74, 138, 0.3);
  border-radius: 2px;
}

/* ========================================
   响应式
   ======================================== */
@media (max-width: 1024px) {
  :root {
    --slide-padding: 2rem;
  }
  
  .two-col, .mcp-visual, .skills-visual, .openclaw-content, .kb-visual {
    grid-template-columns: 1fr;
  }

  .paradigm-evolution {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }

  .paradigm-arrow {
    transform: rotate(90deg);
    font-size: 1.2rem;
    padding: 0.2rem 0;
  }
  
  .title-line {
    font-size: 3.5rem;
  }
  
  .slide-title {
    font-size: 2rem;
  }
  
  .tips-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .practice-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .agent-features {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .timeline {
    flex-wrap: wrap;
    gap: 1rem;
  }
  
  .timeline-line {
    display: none;
  }
  
  .prompt-comparison {
    flex-direction: column;
  }
  
  .prompt-arrow {
    transform: rotate(90deg);
    text-align: center;
  }
  
  .agent-comparison {
    flex-direction: column;
  }
  
  .vs-badge {
    text-align: center;
    justify-content: center;
  }
}

@media (max-width: 640px) {
  .title-line {
    font-size: 2.5rem;
  }
  
  .slide-title {
    font-size: 1.6rem;
  }
  
  .tips-grid, .practice-grid, .myths-grid, .agent-features {
    grid-template-columns: 1fr;
  }
  
  .rag-flow {
    flex-direction: column;
  }
  
  .rag-connector svg {
    transform: rotate(90deg);
  }
  
  .nav-logo {
    display: none;
  }
  
  .ending-title {
    font-size: 2.5rem;
  }
}