:root {
  --bg-color: #0f1117;
  --surface-color: #1a1d29;
  --text-color: #e8e8e8;
  --muted-text: #a0a0a0;
  --border-color: #333;
  --accent-color: #4ade80;
  --negative-color: #f87171;
  --mark-color: #ffffff;
}

[data-theme="light"] {
  --bg-color: #f5f5f7;
  --surface-color: #ffffff;
  --text-color: #1a1a1a;
  --muted-text: #666666;
  --border-color: #dddddd;
  --accent-color: #16a34a;
  --negative-color: #dc2626;
  --mark-color: #1a1a1a;
}

* {
  box-sizing: border-box;
}

.header-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  transition: background-color 0.3s ease, color 0.3s ease;
  max-width: 800px;
  margin: 0 auto;
  padding: 20px;
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.5;
}

.theme-switch {
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
}

.theme-toggle-btn {
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  color: var(--muted-text);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  transition: color 0.2s ease;
}

.theme-toggle-btn:hover {
  color: var(--accent-color);
}

.icon-sun,
.icon-moon {
  display: none;
}

[data-theme="dark"] .icon-moon,
body:not([data-theme]) .icon-moon {
  display: block;
}

[data-theme="light"] .icon-sun {
  display: block;
}

.page-loader {
  position: fixed;
  inset: 0;
  background-color: var(--bg-color);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  z-index: 999;
  transition: opacity 0.3s ease;
}

.page-loader p {
  color: var(--muted-text);
  font-size: 14px;
}

.spinner-large {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border-color);
  border-top-color: var(--accent-color);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

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

.page-loader.hidden {
  opacity: 0;
  pointer-events: none;
}

.logo-img {
  height: 84px;
  width: auto;
  display: block;
}

header p {
  color: var(--muted-text);
  margin-top: 0;
}

section {
  margin: 24px 0;
  padding: 16px;
  background-color: var(--surface-color);
  border-radius: 8px;
}

label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
}

select {
  width: 100%;
  padding: 10px;
  font-size: 16px;
  background-color: var(--surface-color);
  color: var(--text-color);
  border: 1px solid var(--border-color);
  border-radius: 6px;
}

canvas {
  max-height: 350px;
}

.spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid var(--border-color);
  border-top-color: var(--accent-color);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  margin-right: 8px;
  vertical-align: middle;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}
.header-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 8px;
}

#theme-toggle {
  background: none;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 6px 10px;
  font-size: 18px;
  cursor: pointer;
  color: var(--text-color);
}

#theme-toggle:hover {
  background-color: var(--surface-color);
}

#forecast-results {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.as-of-date {
  width: 100%;
  margin-bottom: 8px;
  color: var(--muted-text);
  font-size: 14px;
  font-style: italic;
  text-align: center;
}

.forecast-card {
  flex: 1;
  min-width: 130px;
  padding: 14px;
  border-radius: 8px;
  text-align: center;
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
}

.fade-in {
  animation: fadeIn 0.4s ease-in;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.horizon-amount {
  display: block;
  font-size: 13px;
  color: var(--muted-text);
  margin-top: 4px;
}

.forecast-card .horizon-label {
  display: block;
  font-size: 13px;
  color: var(--muted-text);
  margin-bottom: 6px;
}

.forecast-card .horizon-value {
  display: block;
  font-size: 20px;
  font-weight: 700;
}

.forecast-card .horizon-value.positive {
  color: var(--accent-color);
}

.forecast-card .horizon-value.negative {
  color: var(--negative-color);
}

footer {
  margin-top: 32px;
  padding-top: 16px;
  border-top: 1px solid var(--border-color);
}

.disclaimer {
  font-size: 13px;
  color: var(--muted-text);
  text-align: center;
}

.contact-section {
  margin-top: 16px;
  text-align: center;
}

.connect-label {
  font-size: 13px;
  color: var(--muted-text);
  margin: 0 0 8px 0;
}

.contact-icons {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 16px;
}

.contact-icons a {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--muted-text);
  transition: color 0.2s ease;
}

.contact-icons a:hover {
  color: var(--accent-color);
}

.contact-icons a {
  color: var(--muted-text);
  transition: color 0.2s ease;
}

.contact-icons a:hover {
  color: var(--accent-color);
}

@media (max-width: 480px) {
  body {
    padding: 12px;
  }

  canvas {
    max-height: 250px;
  }

  .forecast-card {
    min-width: 45%;
  }
}