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

:root {
  --bg-color: #ffffff;
  --text-color: #333333;
  --header-bg: #1a1a1a;
  --header-text: #ffffff;
  --border-color: #e0e0e0;
  --accent-color: #007bff;
  --hover-color: #f5f5f5;
  --active-color: #007bff;
  --card-bg: #ffffff;
  --chart-bg: #ffffff;
  --chart-text: #000000;
  --chart-grid: #e0e0e0;
  --shadow: 0 2px 10px rgba(0,0,0,0.1);
}

[data-theme="dark"] {
  --bg-color: #1a1a1a;
  --text-color: #ffffff;
  --text-color2: #a6a6a6;
  --header-bg: #000000;
  --border-color: #333333;
  --hover-color: #2a2a2a;
  --card-bg: #2a2a2a;
  --chart-bg: #000000;
  --chart-text: #ffffff;
  --chart-grid: #333333;
  --shadow: 0 2px 10px rgba(255,255,255,0.1);
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  transition: all 0.3s ease;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.header {
  background: var(--header-bg);
  color: var(--header-text);
  padding: 0.4rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.logo-link {
  text-decoration: none;
  color: inherit;
}

.logo-link:hover h1 {
  color: #1d4ed8;
  transition: color 0.2s;
}
.logo h1 {
  font-size: 1.5rem;
  font-weight: 700;
}

.nav {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.theme-toggle, .login-btn {
  padding: 0.35rem 0.7rem;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.8rem;
  transition: all 0.3s ease;
}

.theme-toggle {
  background: transparent;
  color: var(--header-text);
  font-size: 1rem;
}

.login-btn {
  background: var(--accent-color);
  color: white;
}

.login-btn:hover {
  background: #0056b3;
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-color);
  font-size: 2rem;
  cursor: pointer;
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
}

/* Menu */
.menu-container {
  background: var(--card-bg);
  border-bottom: 1px solid var(--border-color);
  padding: 0.8rem 0;
  position: relative;
}

.menu {
  display: flex;
  gap: 0.2rem;
}

.menu-item {
  padding: 0.5rem 1rem;
  border: 1px solid var(--border-color);
  background: var(--card-bg);
  color: var(--text-color);
  border-radius: 4px;
  cursor: pointer;
  font-weight: 500;
  font-size: 0.8rem;
  transition: all 0.3s ease;
}

.menu-item:hover {
  background: var(--hover-color);
}

.menu-item.active {
  background: var(--active-color);
  color: white;
  border-color: var(--active-color);
}

/* Price Info Panel */
.price-info-panel {
  background: var(--card-bg);
  border-bottom: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 0.5rem;
  margin-bottom: 0.5rem;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
  width: 100%;
  box-sizing: border-box;
}

.symbol-name {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-color2);
  margin-bottom: 0.2rem;
}

.price-data {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.current-price {
  display: flex;
  align-items: baseline;
  gap: 1rem;
}

.price {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-color);
}

.change {
  font-size: 1rem;
  font-weight: 600;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
}

.change.positive {
  color: #059669;
  background: #d1fae5;
}

.change.negative {
  color: #dc2626;
  background: #fee2e2;
}

.market-data {
  display: flex;
  gap: 2rem;
}

.data-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
}

.data-item .label {
  font-size: 0.75rem;
  color: var(--text-color2);
  font-weight: 500;
}

.data-item .value {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-color2);
}

/* 기존 CSS 뒤에 추가 */
.blink-positive {
  animation: blinkGreen 0.6s ease-in-out;
}

.blink-negative {
  animation: blinkRed 0.6s ease-in-out;
}

.blink-neutral {
  animation: blinkGray 0.6s ease-in-out;
}

@keyframes blinkGreen {
  0%, 100% { background-color: transparent; }
  50% { background-color: rgba(244, 212, 97, 0.45); }
}

@keyframes blinkRed {
  0%, 100% { background-color: transparent; }
  50% { background-color: rgba(239, 171, 106, 0.45); }
}

@keyframes blinkGray {
  0%, 100% { background-color: transparent; }
  50% { background-color: rgba(206, 217, 239, 0.44); }
}

/* Main */
.main {
  flex: 1;
  padding: 0.8rem 0;
}

.unit-tabs {
  display: flex;
  margin-bottom: 0.8rem;
  border-bottom: 1px solid var(--border-color);
}

.unit-tab {
  padding: 0.4rem 0.8rem;
  border: none;
  background: transparent;
  color: var(--text-color);
  cursor: pointer;
  font-size: 0.7rem;
  font-weight: 500;
  border-bottom: 3px solid transparent;
  transition: all 0.3s ease;
}

.unit-tab:hover {
  background: var(--hover-color);
}

.unit-tab.active {
  color: var(--active-color);
  border-bottom-color: var(--active-color);
}

.tab-content {
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.chart-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.6rem;
  flex-wrap: nowrap;
  gap: 0.3rem;
  overflow-x: auto;
}

.chart-type-controls, .timeframe-controls {
  display: flex;
  gap: 0.15rem;
  flex-shrink: 0;
}

.control-btn {
  padding: 0.15rem 0.3rem;
  border: 1px solid var(--border-color);
  background: var(--card-bg);
  color: var(--text-color);
  border-radius: 2px;
  cursor: pointer;
  font-size: 0.55rem;
  transition: all 0.3s ease;
  white-space: nowrap;
  min-width: fit-content;
}

.control-btn:hover {
  background: var(--hover-color);
}

.control-btn.active {
  background: var(--active-color);
  color: white;
  border-color: var(--active-color);
}

.chart-container {
  background: var(--card-bg);
  border-radius: 8px;
  box-shadow: var(--shadow);
  margin-bottom: 0.6rem;
  height: 500px;
}

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

.period-controls {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.2rem;
  flex-wrap: wrap;
}

.period-btn {
  padding: 0.2rem 0.4rem;
  border: 1px solid var(--border-color);
  background: var(--card-bg);
  color: var(--text-color);
  border-radius: 2px;
  cursor: pointer;
  font-size: 0.6rem;
  transition: all 0.3s ease;
}

.period-btn:hover {
  background: var(--hover-color);
}

.period-btn.active {
  background: var(--active-color);
  color: white;
  border-color: var(--active-color);
}

.period-btn:disabled,
.period-btn.disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}
.auto-refresh {
  margin-left: 0.4rem;
  display: flex;
  align-items: center;
}

.auto-refresh label {
  display: flex;
  align-items: center;
  gap: 0.2rem;
  cursor: pointer;
  font-size: 0.6rem;
}

/* Footer */
.footer {
  background: var(--header-bg);
  color: var(--header-text);
  padding: 0.8rem 0 0.4rem;
  margin-top: auto;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.company-info h3 {
  margin-bottom: 0.2rem;
  font-size: 1.1rem;
}

.company-info p {
  font-size: 0.9rem;
  line-height: 1.5;
  opacity: 0.8;
}

.copyright {
  text-align: right;
}

.copyright p {
  font-size: 0.8rem;
  opacity: 0.7;
}
.reference-links {
  margin-bottom: 20px;
  text-align: center; /* 모바일에서 중앙 정렬 */
}

.reference-links h4 {
  color: #989696;
  margin-bottom: 8px;
  font-size: 0.95em; /* 글자 크기 축소 */
  font-weight: 600;
}

.reference-links p {
  margin: 3px 0;
  font-size: 0.85em; /* 글자 크기 축소 */
}

.reference-links a {
  color: #28a745; /* 골드 테마에 맞는 녹색 */
  text-decoration: none;
  transition: color 0.3s ease;
  font-weight: 500;
}

.reference-links a:hover {
  color: #1e7e34; /* 호버 시 더 진한 녹색 */
  text-decoration: underline;
}
/* Mobile Styles */
@media (max-width: 768px) {
  .mobile-menu-toggle {
    display: block;
  }

  .menu {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--card-bg);
    box-shadow: var(--shadow);
    z-index: 99;
  }

  .menu.active {
    display: flex;
  }

  .menu-item {
    margin: 0.1rem 0.4rem;
  }

  .chart-controls {
    flex-direction: row;
    align-items: center;
    gap: 0.2rem;
    overflow-x: auto;
    padding: 0.1rem 0;
  }

  .chart-type-controls, .timeframe-controls {
    justify-content: flex-start;
    gap: 0.1rem;
  }

  .chart-container {
    height: 400px;
  }

  .period-controls {
    justify-content: center;
  }

  .auto-refresh {
    margin-left: 0;
    margin-top: 0.2rem;
    justify-content: center;
  }

  .footer-content {
    flex-direction: column;
    text-align: center;
  }

  .copyright {
    text-align: center;
  }

  .price-data {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }

  .current-price {
    width: 100%;
  }

  .market-data {
    width: 100%;
    justify-content: space-between;
  }
  .reference-links {
    text-align: left;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 15px;
  }

  .logo h1 {
    font-size: 1.3rem;
  }

  .chart-container {
    height: 300px;
  }

  .timeframe-controls {
    flex-wrap: wrap;
  }

  .control-btn {
    padding: 0.3rem 0.6rem;
    font-size: 0.75rem;
  }
  .price-info-panel {
    padding: 1rem;
    margin: 0 0.5rem 1rem;
  }

  .current-price {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }

  .price {
    font-size: 1.75rem;
  }

  .market-data {
    gap: 1rem;
  }

}