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

body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  overflow: hidden;
}

.presentation {
  width: 100vw;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.slide {
  width: 90%;
  max-width: 1200px;
  background: white;
  aspect-ratio: 16 / 9;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  padding: 60px;
  display: none;
  flex-direction: column;
  justify-content: center;
  animation: slideIn 0.5s ease;
}

.slide.active {
  display: flex;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

h1 {
  font-size: 3.5em;
  color: #2d3748;
  margin-bottom: 20px;
  font-weight: 700;
}

h2 {
  font-size: 2.5em;
  color: #667eea;
  margin-bottom: 30px;
  font-weight: 600;
}

h3 {
  font-size: 1.8em;
  color: #4a5568;
  margin-bottom: 20px;
  font-weight: 600;
}

.subtitle {
  font-size: 1.5em;
  color: #718096;
  margin-bottom: 40px;
}

.author {
  font-size: 1.2em;
  color: #a0aec0;
  margin-top: 40px;
}

.content {
  font-size: 1.2em;
  line-height: 1.8;
  color: #4a5568;
}

.problem-solution {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  margin-top: 30px;
}

.box {
  padding: 30px;
  border-radius: 15px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.problem {
  background: linear-gradient(135deg, #ff6b6b 0%, #ee5a6f 100%);
  color: white;
}

.solution {
  background: linear-gradient(135deg, #51cf66 0%, #37b24d 100%);
  color: white;
}

.tech-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin-top: 30px;
}

.tech-item {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: 15px 30px;
  border-radius: 25px;
  font-size: 1.1em;
  font-weight: 600;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

.code-block {
  background: #2d3748;
  color: #68d391;
  padding: 25px;
  border-radius: 10px;
  font-family: "Courier New", monospace;
  font-size: 0.95em;
  line-height: 1.6;
  overflow-x: auto;
  white-space: pre-wrap;
  margin: 20px 0;
}

.highlight {
  color: #fbbf24;
  font-weight: 600;
}

ul {
  margin-left: 30px;
  margin-top: 20px;
}

li {
  margin-bottom: 15px;
  font-size: 1.15em;
  line-height: 1.6;
}

.navigation {
  position: fixed;
  bottom: 30px;
  right: 30px;
  display: flex;
  gap: 15px;
  z-index: 1000;
}

.nav-btn {
  background: white;
  border: none;
  padding: 15px 25px;
  border-radius: 50px;
  cursor: pointer;
  font-size: 1em;
  font-weight: 600;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
  transition: all 0.3s;
  color: #667eea;
}

.nav-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
  background: #667eea;
  color: white;
}

.nav-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.slide-number {
  position: fixed;
  bottom: 30px;
  left: 30px;
  background: white;
  padding: 10px 20px;
  border-radius: 25px;
  font-weight: 600;
  color: #667eea;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 25px;
  margin-top: 30px;
}

.feature-card {
  background: #f7fafc;
  padding: 25px;
  border-radius: 15px;
  border-left: 5px solid #667eea;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.feature-icon {
  font-size: 2.5em;
  margin-bottom: 10px;
}

.metrics {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 30px;
  margin-top: 30px;
}

.metric-card {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: 30px;
  border-radius: 15px;
  text-align: center;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.metric-value {
  font-size: 3em;
  font-weight: 700;
  margin-bottom: 10px;
}

.metric-label {
  font-size: 1.2em;
  opacity: 0.9;
}

.steps {
  counter-reset: step-counter;
}

.step {
  counter-increment: step-counter;
  margin: 20px 0;
  padding: 20px;
  background: #f7fafc;
  border-radius: 10px;
  position: relative;
  padding-left: 70px;
}

.step::before {
  content: counter(step-counter);
  position: absolute;
  left: 20px;
  top: 50%;
  transform: translateY(-50%);
  background: #667eea;
  color: white;
  width: 35px;
  height: 35px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
}

/* Timeline Chart Styles */
.timeline {
  position: relative;
  width: 100%;
  margin-top: 40px;
  padding: 20px 0;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}

.timeline::before {
  content: "";
  position: absolute;
  top: 40px; /* icon center */
  left: 5%;
  right: 5%;
  height: 4px;
  background: #e2e8f0;
  z-index: 1;
}

.timeline-item {
  position: relative;
  width: 23%;
  text-align: center;
  z-index: 2;
}

/* 아이콘 (이모지) */
.timeline-icon {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: white;
  border: 4px solid #667eea;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  font-size: 2.5em;
  box-shadow: 0 0 0 8px white;
  transition: transform 0.2s ease-in-out;
}

.timeline-icon:hover {
  transform: scale(1.1);
}

/* 타이틀 텍스트 */
.timeline-content h3 {
  font-size: 1.2em;
  color: #667eea;
  margin-bottom: 10px;
}

/* Hover Fail Image Styles */
.hover-fail-image-container {
  display: block;
  position: absolute;
  bottom: calc(100% + 15px);
  left: 50%;
  transform: translateX(-50%);
  z-index: 100;
  background: #1e1e1e;
  padding: 15px;
  border-radius: 10px;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.4);
  width: 600px;
  height: 450px;
  overflow: hidden;
  opacity: 0;
  visibility: hidden;
  transition:
    opacity 0.4s ease-in-out,
    visibility 0.4s ease-in-out;
}

/* 이미지 두 장 전환 */
.hover-fail-image-container img {
  position: absolute;
  width: 100%;
  height: 100%;
  object-fit: contain; /* ✅ 전체 이미지가 잘리지 않음 */
  object-position: center;
  top: 0;
  left: 0;
  border-radius: 8px;
  opacity: 0;
  transition:
    opacity 0.6s ease,
    transform 0.6s ease,
    filter 0.6s ease;
  filter: brightness(0.9) contrast(1.05);
}

/* 첫 번째(PASS) 이미지 기본 표시 */
.hover-fail-image-container img:first-child {
  opacity: 1;
  z-index: 1;
}

/* hover 시 박스 보이기 */
.timeline-item .timeline-icon:hover ~ .hover-fail-image-container {
  opacity: 1;
  visibility: visible;
}

/* hover 시 PASS → FAIL 전환 */
.timeline-item .timeline-icon:hover ~ .hover-fail-image-container img:first-child {
  opacity: 0;
  transition: all 5s ease;
  transform: scale(1.02); /* 부드러운 퇴장 */
}

.timeline-item .timeline-icon:hover ~ .hover-fail-image-container img:last-child {
  opacity: 1;
  transform: scale(1.04); /* 살짝 확대 (꽉 차는 느낌) */
  filter: brightness(1) contrast(1.15);
}

.hover-trigger .hover-image-container {
  display: none;
  position: absolute;
  bottom: 0;
  left: 105%;
  padding: 10px;
  background-color: white;
  border-radius: 10px;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
  z-index: 10;
  width: 600px; /* 팝업 너비 조절 */
  text-align: center;
}

.hover-trigger:hover .hover-image-container {
  display: block;
}

.hover-image-container img {
  max-width: 100%;
  border-radius: 5px;
}

.hover-image-container img:first-child {
  margin-bottom: 15px;
}

/* vitest_ppt/style.css 파일에 추가 */

/* 툴팁 스타일 */
.hover-tooltip {
  display: none;
  position: absolute;
  bottom: 110%; /* 카드 위쪽에 표시 */
  left: 50%;
  transform: translateX(-50%);
  background-color: #2d3748; /* 어두운 배경 */
  color: #f7fafc; /* 밝은 텍스트 */
  padding: 15px;
  border-radius: 8px;
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
  z-index: 100;
  width: 280px; /* 툴팁 너비 */
  text-align: left;
  font-size: 0.9em;
  line-height: 1.6;
  border: 1px solid #4a5568;
}

.hover-tooltip::after {
  content: "";
  position: absolute;
  top: 100%;
  left: 50%;
  margin-left: -8px;
  border-width: 8px;
  border-style: solid;
  border-color: #2d3748 transparent transparent transparent;
}

.hover-tooltip h4 {
  margin-top: 0;
  margin-bottom: 12px;
  color: #a0aec0;
  font-size: 1em;
  border-bottom: 1px solid #4a5568;
  padding-bottom: 8px;
}

.hover-tooltip p {
  margin: 4px 0;
  color: #e2e8f0;
}

.hover-tooltip hr {
  border: none;
  border-top: 1px solid #4a5568;
  margin: 12px 0;
}

.hover-tooltip p strong {
  color: #a0aec0;
  min-width: 70px;
  display: inline-block;
}

/* 호버 시 툴팁 표시 */
.hover-trigger:hover .hover-tooltip {
  display: block;
}