:root {
  /* 색상 변수 */
  --bg-primary: #121212;
  --bg-secondary: #1a1a1a;
  --bg-card: #1a1d23;
  --border-color: #2d3748;
  --text-primary: #ffffff;
  --text-secondary: #9ca3af;
  --color-primary: #3b82f6;
  --color-secondary: #10b981;
  --color-gray: #4b5563;
  --color-yellow: #f59e0b;

  /* 개선된 트랜지션 변수 - 더 자연스러운 이징 */
  --transition-fast: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-medium: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 500ms cubic-bezier(0.68, -0.55, 0.265, 1.55);

  /* 프로그래스바 전용 변수 */
  --progress-dot-size: 20px;
  --progress-dot-active-size: 32px;
  --progress-line-height: 3px;
  --progress-shadow: 0 4px 20px rgba(59, 130, 246, 0.25);
  --progress-glow: 0 0 20px rgba(59, 130, 246, 0.3);
}

body {
  background-color: var(--bg-primary);
}

/* hidden 클래스 강제 적용 */
.hidden {
  display: none !important;
}

/* invisible 클래스 정의 */
.invisible {
  visibility: hidden !important;
  opacity: 0 !important;
  pointer-events: none !important;
}

/* step-content 강제 표시 */
.step-content {
  display: block !important;
  position: relative !important;
  z-index: 1 !important;
  min-height: 200px !important;
  width: 100% !important;
  transition: all 300ms cubic-bezier(0.4, 0, 0.2, 1);
  opacity: 1;
  transform: translateY(0);
}

.step-content.hidden {
  display: none !important;
}

/* step-card 강제 스타일 */
.step-card {
  background-color: #1a1a1a !important;
  display: block !important;
  position: relative !important;
  z-index: 1 !important;
  min-height: 200px !important;
  width: 100% !important;
  transition: all 300ms cubic-bezier(0.4, 0, 0.2, 1);
  transform: translateY(0);
  opacity: 1;
}

.step-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

/* section-card 강제 스타일 */
.section-card {
  background-color: var(--bg-card) !important;
  display: block !important;
  position: relative !important;
  z-index: 1 !important;
  min-height: 100px !important;
  transition: all 250ms cubic-bezier(0.4, 0, 0.2, 1);
}

.section-card:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.progress-step {
  transition: all var(--transition-slow);
}

.progress-step.active {
  background-color: var(--color-primary);
  color: var(--text-primary);
}

.progress-step.completed {
  background-color: var(--color-secondary);
  color: var(--text-primary);
}

.progress-step.pending {
  background-color: #374151;
  color: var(--text-secondary);
}

.pg-dot {
  width: var(--progress-dot-size);
  height: var(--progress-dot-size);
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-gray) 0%, #374151 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-medium);
  transform: scale(0.85);
  will-change: transform, background, box-shadow;
  position: relative;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.pg-dot::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.1) 0%,
    transparent 50%
  );
  border-radius: 50%;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.pg-dot:hover::before {
  opacity: 1;
}

.pg-dot--active {
  width: var(--progress-dot-active-size);
  height: var(--progress-dot-active-size);
  background: linear-gradient(135deg, var(--color-primary) 0%, #2563eb 100%);
  color: var(--text-primary);
  box-shadow: var(--progress-shadow), var(--progress-glow);
  transform: scale(1.1);
  animation: pulse-glow 2s ease-in-out infinite;
}

.pg-dot--done {
  background: linear-gradient(135deg, var(--color-secondary) 0%, #059669 100%);
  color: var(--text-primary);
  transform: scale(0.95);
  box-shadow: 0 2px 12px rgba(16, 185, 129, 0.3);
}

.pg-num {
  font-size: 11px;
  font-weight: 700;
  line-height: 1;
  transition: all var(--transition-fast);
  z-index: 1;
  position: relative;
}

.pg-dot--active .pg-num {
  font-size: 14px;
  font-weight: 800;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.pg-line {
  height: var(--progress-line-height);
  background: linear-gradient(90deg, var(--color-gray) 0%, #374151 100%);
  width: 40px;
  border-radius: 2px;
  transition: all var(--transition-medium);
  position: relative;
  overflow: hidden;
  opacity: 0.3; /* 기본적으로 약간 투명하게 */
}

.pg-line:not(.invisible) {
  opacity: 1; /* visible 상태일 때만 완전히 보이게 */
}

.pg-line::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--color-secondary) 0%, #059669 100%);
  transition: width var(--transition-slow);
  border-radius: 2px;
}

.pg-line--done {
  background: linear-gradient(90deg, var(--color-secondary) 0%, #059669 100%);
  box-shadow: 0 1px 4px rgba(16, 185, 129, 0.3);
}

.pg-line--done::before {
  width: 100%;
}

/* ghost (사라짐/다가옴) 표현 */
.pg-ghost {
  opacity: 0.3;
  transform: scale(0.7);
  filter: blur(0.5px);
  transition: all var(--transition-medium);
}

.pg-ghost-line {
  opacity: 0.3;
  filter: blur(0.5px);
  transition: all var(--transition-medium);
}

/* 방향성 보강을 위한 약한 그라데이션 마스크 컨테이너에서 사용 */
.fade-mask-left {
  pointer-events: none;
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  height: 40px;
  width: 48px;
  background: linear-gradient(
    90deg,
    var(--bg-primary) 0%,
    rgba(18, 18, 18, 0.8) 50%,
    rgba(18, 18, 18, 0) 100%
  );
  z-index: 2;
}

.fade-mask-right {
  pointer-events: none;
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  height: 40px;
  width: 48px;
  background: linear-gradient(
    270deg,
    var(--bg-primary) 0%,
    rgba(18, 18, 18, 0.8) 50%,
    rgba(18, 18, 18, 0) 100%
  );
  z-index: 2;
}

/* 컨테이너 슬라이드 애니메이션 */
.pg-container {
  will-change: transform;
  transition: transform var(--transition-medium);
}

@keyframes pg-slide-left {
  0% {
    transform: translateX(15px) scale(0.98);
    opacity: 0.8;
  }
  100% {
    transform: translateX(0) scale(1);
    opacity: 1;
  }
}

@keyframes pg-slide-right {
  0% {
    transform: translateX(-15px) scale(0.98);
    opacity: 0.8;
  }
  100% {
    transform: translateX(0) scale(1);
    opacity: 1;
  }
}

.pg-slide-left {
  animation: pg-slide-left var(--transition-medium);
}

.pg-slide-right {
  animation: pg-slide-right var(--transition-medium);
}

/* 새로운 애니메이션 키프레임 */
@keyframes pulse-glow {
  0%,
  100% {
    box-shadow: var(--progress-shadow), var(--progress-glow);
  }
  50% {
    box-shadow: var(--progress-shadow), 0 0 30px rgba(59, 130, 246, 0.4);
  }
}

@keyframes dot-appear {
  0% {
    transform: scale(0) rotate(180deg);
    opacity: 0;
  }
  60% {
    transform: scale(1.1) rotate(0deg);
  }
  100% {
    transform: scale(1) rotate(0deg);
    opacity: 1;
  }
}

@keyframes line-fill {
  0% {
    width: 0;
  }
  100% {
    width: 100%;
  }
}

/* 활성 점 등장 애니메이션 */
.pg-dot--active {
  animation: dot-appear var(--transition-bounce),
    pulse-glow 2s ease-in-out infinite;
}

/* 라인 완료 애니메이션 */
.pg-line--done::before {
  animation: line-fill var(--transition-slow);
}

/* 구분 카드 스타일 */
.section-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
}

.section-body {
  padding: 1rem;
}

/* 버튼 스타일 */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: 0.75rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  text-align: center;
  text-decoration: none;
  transition: all 250ms cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.btn::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.2),
    transparent
  );
  transition: left 500ms ease;
}

.btn:hover::before {
  left: 100%;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
}

.btn:active {
  transform: translateY(0);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary) 0%, #2563eb 100%);
  color: var(--text-primary);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
}

.btn-secondary {
  background: linear-gradient(135deg, #6b7280 0%, #4b5563 100%);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background: linear-gradient(135deg, #4b5563 0%, #374151 100%);
}

.btn-yellow {
  background: linear-gradient(135deg, var(--color-yellow) 0%, #d97706 100%);
  color: var(--text-primary);
}

.btn-yellow:hover {
  background: linear-gradient(135deg, #d97706 0%, #b45309 100%);
}