:root {
  --primary-bg: #0a0a0a;
  --secondary-bg: #1a1a1a;
  --accent-bg: #2a2a2a;
  --text-primary: #ffffff;
  --text-secondary: #a0a0a0;
  --accent-color: #4f46e5;
  --accent-hover: #6366f1;
  --border-color: #333333;
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --danger-color: #ef4444;
  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.1);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--primary-bg);
  color: var(--text-primary);
  overflow: hidden;
  position: relative;
}

/* 배경 그라디언트 애니메이션 */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(circle at 20% 80%, rgba(120, 119, 198, 0.3) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(255, 119, 198, 0.3) 0%, transparent 50%),
    radial-gradient(circle at 40% 40%, rgba(120, 219, 255, 0.2) 0%, transparent 50%);
  animation: gradientShift 20s ease infinite;
  pointer-events: none;
}

@keyframes gradientShift {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 80px;
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  z-index: 1000;
}

#title {
  display: flex;
  align-items: center;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  gap: 0.5rem;
}

#title img {
  height: 2rem;
  width: 2rem;
  filter: drop-shadow(0 0 10px rgba(79, 70, 229, 0.5));
}

nav a {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  transition: all 0.3s ease;
  border: 1px solid transparent;
}

nav a:hover {
  color: var(--text-primary);
  background: var(--glass-bg);
  border-color: var(--glass-border);
  transform: translateY(-1px);
}

#globe-container {
  position: relative;
  width: 100vw;
  height: 100vh;
  padding-top: 80px;
}

#globeViz {
  width: 100%;
  height: 100%;
}

/* 컨트롤 패널 */
.control-panel {
  position: fixed;
  bottom: 2rem;
  left: 2rem;
  right: 2rem;
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  z-index: 1000;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
  transition: transform 0.3s ease;
}

.control-panel.collapsed {
  transform: translateY(calc(100% - 60px));
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  cursor: pointer;
  border-bottom: 1px solid var(--glass-border);
  user-select: none;
}

.panel-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.toggle-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 1.2rem;
  cursor: pointer;
  transition: all 0.3s ease;
  padding: 0.5rem;
  border-radius: 8px;
}

.toggle-btn:hover {
  color: var(--text-primary);
  background: var(--glass-bg);
  transform: scale(1.1);
}

.panel-content {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

#info {
  font-size: 0.9rem;
  color: var(--text-secondary);
  text-align: center;
  margin-bottom: 1rem;
  padding: 1rem;
  background: var(--accent-bg);
  border-radius: 12px;
  border: 1px solid var(--border-color);
}

#coord-form {
  display: flex;
  gap: 1rem;
  align-items: center;
  flex-wrap: wrap;
  justify-content: center;
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.input-group label {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

input[type="number"] {
  background: var(--secondary-bg);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.75rem 1rem;
  border-radius: 8px;
  font-size: 0.9rem;
  font-family: 'Inter', monospace;
  width: 120px;
  transition: all 0.3s ease;
  -moz-appearance: textfield;
}

input[type="text"] {
  background: var(--secondary-bg);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.75rem 1rem;
  border-radius: 8px;
  font-size: 0.9rem;
  width: 180px;
  transition: all 0.3s ease;
}

input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

input[type="number"]:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

input[type="text"]:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

button {
  background: var(--accent-color);
  color: white;
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

button:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(79, 70, 229, 0.3);
}

button:active {
  transform: translateY(0);
}

/* 결과 표시 */
.result-info {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 1rem;
}

.location-card {
  background: var(--secondary-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1rem;
  position: relative;
  overflow: hidden;
}

.location-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--warning-color), var(--accent-color));
}

.location-card.antipode::before {
  background: linear-gradient(90deg, var(--danger-color), var(--warning-color));
}

.location-title {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 0.5rem;
}

.location-name {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.location-coords {
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-family: 'Inter', monospace;
}

/* 반응형 디자인 */
@media (max-width: 768px) {
  header {
    padding: 0 1rem;
  }

  #title {
    font-size: 1.2rem;
  }

  .control-panel {
    bottom: 1rem;
    left: 1rem;
    right: 1rem;
  }

  .panel-content {
    padding: 1rem;
  }

  .control-panel.collapsed {
    transform: translateY(calc(100% - 50px));
  }

  #coord-form {
    flex-direction: column;
    gap: 0.5rem;
  }

  .result-info {
    grid-template-columns: 1fr;
  }

  input[type="number"] {
    width: 100%;
  }
  input[type="text"] {
    width: 100%;
  }
}

/* 로딩 애니메이션 */
.loading {
  position: relative;
  overflow: hidden;
}

.loading::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
  animation: shimmer 2s infinite;
}

@keyframes shimmer {
  0% { left: -100%; }
  100% { left: 100%; }
}

/* 성공 메시지 */
.success-message {
  position: fixed;
  top: 100px;
  right: 2rem;
  background: var(--success-color);
  color: white;
  padding: 1rem 1.5rem;
  border-radius: 8px;
  font-weight: 500;
  z-index: 1001;
  transform: translateX(100%);
  transition: transform 0.3s ease;
}

.success-message.show {
  transform: translateX(0);
}

/* 인스트럭션 개선 */
.instruction {
  text-align: center;
  padding: 1rem;
  background: linear-gradient(135deg, rgba(79, 70, 229, 0.1), rgba(139, 92, 246, 0.1));
  border: 1px solid rgba(79, 70, 229, 0.2);
  border-radius: 12px;
  margin-bottom: 1rem;
}

.instruction-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.instruction-text {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* Other Sites 페이지 스타일 */
#sites-list {
 margin-top: 80px;
 padding: 2rem;
 display: flex;
 justify-content: center;
 align-items: center;
 min-height: calc(100vh - 80px);
}

#sites-list ul {
 list-style: none;
 max-width: 600px;
 width: 100%;
}

#sites-list li {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  padding: 0;
  margin-bottom: 1.5rem;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

#sites-list li::before {
 content: '';
 position: absolute;
 top: 0;
 left: 0;
 right: 0;
 height: 3px;
 background: linear-gradient(90deg, var(--accent-color), var(--accent-hover));
 transform: scaleX(0);
 transition: transform 0.3s ease;
}

#sites-list li:hover {
 transform: translateY(-4px);
 box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
 border-color: var(--accent-color);
}

#sites-list li:hover::before {
 transform: scaleX(1);
}

#sites-list li:hover img {
 transform: scale(1.1);
 filter: drop-shadow(0 0 15px rgba(79, 70, 229, 0.7));
}

#sites-list a {
  text-decoration: none;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 1.5rem;
  font-size: 1.2rem;
  font-weight: 600;
  transition: all 0.3s ease;
  padding: 2rem;
  width: 100%;
  height: 100%;
  box-sizing: border-box;
}

#sites-list a:hover {
 color: var(--accent-hover);
}

#sites-list img {
 width: 48px;
 height: 48px;
 border-radius: 12px;
 transition: all 0.3s ease;
 box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

/* 반응형 디자인 */
@media (max-width: 768px) {
 #sites-list {
   padding: 1rem;
 }

  #sites-list li {
    padding: 0;
  }

  #sites-list a {
    font-size: 1.1rem;
    gap: 1rem;
    padding: 1.5rem;
  }

 #sites-list img {
   width: 40px;
   height: 40px;
 }
}

/* 빈 상태 메시지 */
.empty-state {
 text-align: center;
 padding: 4rem 2rem;
 color: var(--text-secondary);
}

.empty-state h2 {
 font-size: 1.5rem;
 margin-bottom: 1rem;
 color: var(--text-primary);
}

.empty-state p {
 font-size: 1rem;
 margin-bottom: 2rem;
}

.empty-state button {
 background: var(--accent-color);
 color: white;
 border: none;
 padding: 1rem 2rem;
 border-radius: 12px;
 font-size: 1rem;
 font-weight: 600;
 cursor: pointer;
 transition: all 0.3s ease;
}

.empty-state button:hover {
 background: var(--accent-hover);
 transform: translateY(-2px);
 box-shadow: 0 10px 20px rgba(79, 70, 229, 0.3);
}

/* 로딩 스피너 */
.loading-spinner {
 display: inline-block;
 width: 20px;
 height: 20px;
 border: 2px solid var(--glass-border);
 border-radius: 50%;
 border-top-color: var(--accent-color);
 animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
 to { transform: rotate(360deg); }
}

/* 애니메이션 지연 */
#sites-list li:nth-child(1) {
 animation: fadeInUp 0.6s ease 0.1s both;
}

#sites-list li:nth-child(2) {
 animation: fadeInUp 0.6s ease 0.2s both;
}

#sites-list li:nth-child(3) {
 animation: fadeInUp 0.6s ease 0.3s both;
}

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

/* 기본 링크 스타일 */
a {
 color: var(--accent-color);
 text-decoration: none;
 transition: all 0.3s ease;
}

a:hover {
 color: var(--accent-hover);
 text-decoration: underline;
}

a:focus {
 outline: 2px solid var(--accent-color);
 outline-offset: 2px;
 border-radius: 4px;
}

a:visited {
 color: var(--text-secondary);
}

a:active {
 color: var(--accent-hover);
 transform: scale(0.98);
}