* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: 'Segoe UI', sans-serif;
  background: #1f242d;
  color: #f4f6fb;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}
header, footer {
  padding: 1.25rem 2rem;
  background: #111821;
  box-shadow: inset 0 -1px 0 rgba(255, 255, 255, 0.04);
  text-align: center;
}
header h1 {
  margin: 0 0 0.75rem;
  font-size: 1.8rem;
}
header p {
  margin: 0;
  font-size: 0.95rem;
  color: #aeb5c0;
}

/* 스테이지 네비게이션 */
.stage-nav {
  display: flex;
  gap: 1rem;
  justify-content: center;
  align-items: center;
  margin-top: 0.5rem;
}

.stage-link {
  padding: 0.5rem 1rem;
  background: linear-gradient(135deg, #3b82f6, #2563eb);
  color: white;
  text-decoration: none;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  transition: all 0.3s ease;
  box-shadow: 0 2px 8px rgba(59, 130, 246, 0.3);
}

.stage-link:hover {
  background: linear-gradient(135deg, #2563eb, #1d4ed8);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
}

.stage-current {
  padding: 0.5rem 1rem;
  background: rgba(255, 255, 255, 0.1);
  color: #10b981;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  border: 2px solid #10b981;
}
main {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.8rem; /* 간격 축소 */
  padding: 0.8rem 1rem; /* 패딩 축소 */
  align-items: center;
  text-align: center;
}
.simulation {
  position: relative;
  display: flex;
  justify-content: center;
  margin: 0.3rem 0 0 0; /* 위쪽만 최소 여백, 아래쪽 여백 제거 */
}
canvas {
  width: 100%;
  max-width: 960px;
  border-radius: 16px;
  background: radial-gradient(circle at top, #3a424f 0%, #232832 55%, #161a22 100%);
  box-shadow: 0 24px 40px rgba(0, 0, 0, 0.35), inset 0 0 20px rgba(255, 255, 255, 0.04);
}
.hud {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  background: rgba(17, 24, 33, 0.6);
  border-radius: 14px;
  padding: 1.25rem;
  backdrop-filter: blur(6px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  text-align: center;
  align-items: center;
}
.hud h2 {
  margin: 0 0 0.5rem;
  font-size: 1.1rem;
}
.hud ol, .hud ul {
  margin: 0;
  padding-left: 1.25rem;
  color: #cbd3df;
}
.status dl {
  margin: 0;
  display: grid;
  gap: 0.35rem 0.75rem;
}
.status div {
  display: contents;
}
.status dt {
  font-weight: 600;
  color: #91a2bc;
}
.status dd {
  margin: 0;
  font-variant-numeric: tabular-nums;
}
#reset-btn {
  align-self: start;
  padding: 0.6rem 1.4rem;
  border-radius: 999px;
  border: none;
  background: linear-gradient(135deg, #ffb703, #fb8500);
  color: #0b0d12;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
#reset-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 18px rgba(251, 133, 0, 0.3);
}
.checklist {
  background: rgba(17, 24, 33, 0.7);
  border-radius: 12px;
  padding: 1rem 1.25rem;
  border: 1px solid rgba(255, 255, 255, 0.06);
  text-align: center;
}
.checklist h2 {
  margin-top: 0;
}

.checklist-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 0.8rem; /* 간격 축소 */
  margin-top: 0.5rem; /* 여백 축소 */
}

.checklist-item {
  background: rgba(255, 255, 255, 0.05);
  border-radius: 8px;
  padding: 0.8rem; /* 패딩 축소 */
  text-align: left;
}

.checklist-item h3 {
  margin: 0 0 0.75rem;
  font-size: 1rem;
  color: #f4f6fb;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  padding-bottom: 0.5rem;
}

.checklist-item ul {
  margin: 0;
  padding-left: 1.2rem;
  color: #cbd3df;
}

.checklist-item li {
  margin: 0.4rem 0;
}
footer {
  text-align: center;
  color: #7d8797;
  font-size: 0.85rem;
}
@media (max-width: 1024px) {
  .simulation {
    grid-template-columns: 1fr;
  }
  canvas {
    max-width: 100%;
  }
}

/* 터치 컨트롤 스타일 */
.touch-controls {
  display: flex;
  gap: 0.5rem;
  margin-top: 1rem;
}

.touch-controls button {
  flex: 1;
  padding: 0.75rem;
  border: 2px solid #007bff;
  background: #007bff;
  color: white;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: bold;
  cursor: pointer;
  transition: all 0.2s ease;
  touch-action: manipulation;
  -webkit-user-select: none;
  user-select: none;
}

.touch-controls button:hover,
.touch-controls button:focus {
  background: #0056b3;
  border-color: #0056b3;
  transform: translateY(-1px);
}

.touch-controls button:active {
  transform: translateY(1px);
  background: #004494;
}

.brake-btn {
  background: linear-gradient(145deg, #dc3545, #c82333) !important;
}

.brake-btn:active {
  background: linear-gradient(145deg, #a71e2a, #801f2c) !important;
}

.reset-btn {
  background: linear-gradient(145deg, #28a745, #20a03a) !important;
}

.reset-btn:active {
  background: linear-gradient(145deg, #1e7e34, #155724) !important;
}

.large-btn {
  width: 47px !important; /* 70px의 2/3 */
  height: 47px !important; /* 70px의 2/3 */
  font-size: 16px !important; /* 24px의 2/3 */
}

.brake-btn.large-btn {
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
}

.brake-btn.large-btn .arrow {
  text-align: center !important;
}

/* 컨트롤과 도전 버튼들을 나란히 배치하는 컨테이너 */
.control-and-challenge-container {
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 20px; /* 간격 조금 늘림 */
  z-index: 1000;
}

/* 화살표 컨트롤 패드 */
.mobile-control-pad {
  display: block;
  width: 280px;
  background: rgba(0, 0, 0, 0.9);
  border-radius: 15px;
  padding: 0.8rem;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

.control-pad-container {
  display: grid;
  grid-template-columns: auto auto auto auto auto; /* 기존대로: 리셋, 왼쪽, 중앙, 오른쪽, 브레이크 */
  align-items: center;
  justify-items: center;
  gap: 0.4rem;
  max-width: 250px; /* 원래 크기로 복원 */
  margin: 0 auto;
  justify-content: center;
}

.reset-btn {
  grid-column: 1;
}

.left-btn {
  grid-column: 2;
}

.vertical-controls {
  grid-column: 3;
}

.right-btn {
  grid-column: 4;
}

.brake-btn {
  grid-column: 5;
}

.vertical-controls {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin: 0 1rem; /* 중앙 전진/후진 버튼에 좌우 여백 */
}

.arrow-btn {
  width: 43px; /* 65px의 2/3 */
  height: 43px; /* 65px의 2/3 */
  border: none;
  border-radius: 8px; /* 12px의 2/3 */
  background: linear-gradient(145deg, #4a5568, #2d3748);
  color: white;
  font-size: 1.2rem; /* 1.8rem의 2/3 */
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
  touch-action: manipulation;
  -webkit-user-select: none;
  user-select: none;
}

.arrow-btn:active {
  transform: scale(0.95);
  background: linear-gradient(145deg, #2d3748, #1a202c);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.4);
}

.forward-btn:active {
  background: linear-gradient(145deg, #38a169, #2f855a);
}

.backward-btn:active {
  background: linear-gradient(145deg, #e53e3e, #c53030);
}

.left-btn:active {
  background: linear-gradient(145deg, #3182ce, #2c5aa0);
}

.right-btn:active {
  background: linear-gradient(145deg, #3182ce, #2c5aa0);
}

.arrow {
  display: block;
  line-height: 1;
}

/* 터치 디바이스용 추가 스타일 */
@media (max-width: 768px) {
  .touch-controls {
    margin-top: 1rem;
    background: rgba(255, 255, 255, 0.95);
    padding: 0.5rem;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  }

  .touch-controls button {
    padding: 1rem;
    font-size: 1.1rem;
  }

  .simulation {
    grid-template-columns: 1fr;
  }

  canvas {
    max-width: 100%;
  }
}

/* 목표 섹션 스타일 */
.goal-info {
  margin: 0.5rem 0; /* 여백 축소 */
  padding: 0.8rem; /* 패딩 축소 */
  background: rgba(17, 24, 33, 0.6);
  border-radius: 12px;
  backdrop-filter: blur(6px);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.goal-info h2 {
  margin: 0 0 0.75rem;
  font-size: 1.1rem;
  color: #f4f6fb;
}

.goal-info ol {
  margin: 0;
  padding-left: 1.25rem;
  color: #cbd3df;
}

/* 조작법 안내 */
.controls-info {
  margin: 6rem 0 0.5rem 0; /* 상단 여백을 6rem으로 크게 늘려서 조작법 문구 자체를 아래로 내림 */
  padding: 0.8rem; /* 패딩은 원래대로 */
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-radius: 8px;
  text-align: center;
}

.controls-info p {
  margin: 0;
  color: #cbd3df;
  font-size: 0.9rem;
  line-height: 1.4;
}

/* 코스 순서 섹션 스타일 */
.course-order {
  margin: 2rem 0;
  padding: 1.5rem;
  background: linear-gradient(135deg, #f8fafc, #e2e8f0);
  border-radius: 12px;
  border: 2px solid #cbd5e1;
  text-align: center;
}

.course-order h2 {
  color: #1e293b;
  margin-bottom: 1rem;
  text-align: center;
  font-size: 1.5rem;
}

.order-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1rem;
  margin-bottom: 1rem;
}

.order-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem;
  background: white;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  border: 1px solid #e2e8f0;
}

.order-number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  font-size: 1.5rem;
  font-weight: bold;
  color: white;
  flex-shrink: 0;
}

.order-number.red {
  background: #f87171;
}

.order-number.green {
  background: #4ade80;
}

.order-number.blue {
  background: #3b82f6;
}

.order-content h3 {
  margin: 0 0 0.5rem 0;
  color: #1e293b;
  font-size: 1.1rem;
}

.order-content p {
  margin: 0;
  color: #64748b;
  font-size: 0.9rem;
}

.order-note {
  text-align: center;
  font-size: 1rem;
  color: #475569;
  margin: 0;
}

.red-text {
  color: #f87171;
  font-weight: bold;
}

.green-text {
  color: #4ade80;
  font-weight: bold;
}

/* 게임 시작/실패 오버레이 스타일 */
.game-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  backdrop-filter: blur(5px);
}

.game-overlay.hidden {
  display: none;
}

.overlay-content {
  background: linear-gradient(135deg, #1f242d, #111821);
  padding: 3rem 2.5rem;
  border-radius: 20px;
  text-align: center;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
  border: 2px solid rgba(255, 255, 255, 0.1);
  max-width: 500px;
  width: 90%;
}

.overlay-content h2 {
  margin: 0 0 1rem 0;
  font-size: 2rem;
  color: #f4f6fb;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
}

.overlay-content p {
  margin: 0 0 2rem 0;
  font-size: 1.1rem;
  color: #cbd3df;
  line-height: 1.5;
}

.start-btn {
  padding: 0.7rem 1.3rem; /* 1rem 2rem의 2/3 */
  font-size: 0.8rem; /* 1.2rem의 2/3 */
  font-weight: bold;
  border: none;
  border-radius: 8px; /* 12px의 2/3 */
  background: linear-gradient(135deg, #22c55e, #16a34a);
  color: white;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(34, 197, 94, 0.3);
  min-width: 100px; /* 150px의 2/3 */
}

.start-btn:hover {
  background: linear-gradient(135deg, #16a34a, #15803d);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(34, 197, 94, 0.4);
}

.start-btn:active {
  transform: translateY(0);
  box-shadow: 0 2px 10px rgba(34, 197, 94, 0.3);
}

.start-btn.restart {
  background: linear-gradient(135deg, #f59e0b, #d97706);
  box-shadow: 0 4px 15px rgba(245, 158, 11, 0.3);
}

.start-btn.restart:hover {
  background: linear-gradient(135deg, #d97706, #b45309);
  box-shadow: 0 6px 20px rgba(245, 158, 11, 0.4);
}

/* 왼쪽과 오른쪽 도전 버튼 영역 */
.challenge-left-side,
.challenge-right-side {
  display: flex;
  flex-direction: row; /* 가로로 변경 */
  gap: 0.5rem;
  align-items: flex-start; /* 위쪽 정렬로 변경 */
  background: rgba(0, 0, 0, 0.8);
  border-radius: 12px;
  padding: 0.5rem 0.6rem;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}

.challenge-right-side {
  gap: 0.4rem; /* 3개 버튼이라 간격 조금 줄임 */
}

/* 개별 도전 버튼과 시간 기록을 세로로 묶는 컨테이너 */
.challenge-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.3rem;
}

.challenge-btn {
  background: linear-gradient(135deg, #4f46e5, #3730a3);
  color: white;
  border: none;
  border-radius: 6px;
  padding: 5px 10px;
  font-size: 11px;
  font-weight: bold;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 2px 8px rgba(79, 70, 229, 0.3);
  min-width: 60px;
  width: 60px; /* 고정 너비 - S라인2가 한 줄에 들어가도록 증가 */
  height: 28px; /* 고정 높이 */
  display: flex;
  align-items: center;
  justify-content: center;
}

.challenge-btn:hover {
  background: linear-gradient(135deg, #3730a3, #312e81);
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.4);
  transform: translateY(-1px);
}

.challenge-btn.active {
  background: linear-gradient(135deg, #10b981, #059669);
  box-shadow: 0 2px 8px rgba(16, 185, 129, 0.3);
}

.challenge-btn.active:hover {
  background: linear-gradient(135deg, #059669, #047857);
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.4);
}

/* 기존 시간 기록 영역 제거됨 - 이제 각 버튼 아래 표시 */

.time-record {
  background: rgba(255, 255, 255, 0.15);
  color: #e5e7eb;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 9px;
  font-weight: 500;
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  min-width: 42px;
  text-align: center;
  white-space: nowrap;
}

.time-record.all-record {
  background: rgba(79, 70, 229, 0.25);
  color: #a5b4fc;
  border-color: rgba(79, 70, 229, 0.4);
  font-size: 9px;
  font-weight: 600;
  min-width: 42px;
  padding: 2px 6px;
}

.time-record.completed {
  background: rgba(16, 185, 129, 0.2);
  color: #10b981;
  border-color: rgba(16, 185, 129, 0.3);
}

.time-record.all-record.completed {
  background: rgba(16, 185, 129, 0.3);
  color: #34d399;
  border-color: rgba(16, 185, 129, 0.5);
}

/* 성공 메시지 오버레이 */
.success-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  backdrop-filter: blur(5px);
}

.success-overlay.hidden {
  display: none;
}

.success-content {
  background: linear-gradient(135deg, #10b981, #059669);
  color: white;
  padding: 40px;
  border-radius: 20px;
  text-align: center;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
  animation: successPop 0.5s ease-out;
}

.success-content h2 {
  margin: 0 0 15px 0;
  font-size: 28px;
  font-weight: bold;
}

.success-content p {
  margin: 0;
  font-size: 18px;
  font-weight: 500;
}

@keyframes successPop {
  0% {
    opacity: 0;
    transform: scale(0.5);
  }
  100% {
    opacity: 1;
    transform: scale(1);
  }
}

/* 모바일 반응형 */
@media (max-width: 768px) {
  .control-and-challenge-container {
    gap: 12px;
  }

  .mobile-control-pad {
    width: 260px; /* 모바일에서 조금 줄임 */
  }

  .control-pad-container {
    max-width: 230px;
  }

  .challenge-btn {
    width: 52px;
    height: 26px;
    min-width: 52px;
    padding: 4px 8px;
    font-size: 10px;
  }

  .challenge-left-side,
  .challenge-right-side {
    padding: 0.4rem 0.5rem;
    gap: 0.3rem;
  }

  .challenge-right-side {
    gap: 0.25rem; /* 3개 버튼이라 더 좁게 */
  }

  .challenge-item {
    gap: 0.2rem; /* 모바일에서 간격 줄임 */
  }

  .time-record {
    min-width: 36px;
    font-size: 8px;
    padding: 1px 4px;
  }

  .time-record.all-record {
    min-width: 36px;
    font-size: 8px;
    padding: 1px 4px;
  }
}


/* 자율 시연 버튼 (자율주차·자율주행 데모) */
.auto-demo-btn { background: linear-gradient(180deg, #3b82f6, #1d4ed8) !important; color: #fff !important; }
.auto-demo-btn.running { background: linear-gradient(180deg, #f59e0b, #b45309) !important; }
/* 원본판/개선판 전환 — 배너 색과 맞춘다 (개선판=파랑, 원본판=빨강) */
.auto-mode-btn { background: linear-gradient(180deg, #60a5fa, #2563eb) !important; color: #fff !important; }
.auto-mode-btn.slow { background: linear-gradient(180deg, #f87171, #b91c1c) !important; }