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

:root {
  --transition-duration: 0.8s;
  --bg-color: #1a1a2e;
  --text-color: #e0e0e0;
  --card-bg: rgba(255, 255, 255, 0.08);
  --card-border: rgba(255, 255, 255, 0.12);
  --accent: #f0c040;
  --btn-hover: rgba(255, 255, 255, 0.15);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, system-ui, sans-serif;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--bg-color);
  color: var(--text-color);
  transition: background-color var(--transition-duration) ease, color var(--transition-duration) ease;
  padding: 1rem;
}

body.theme-dark {
  --bg-color: #0d0d1a;
  --text-color: #bbb;
  --card-bg: rgba(255, 255, 255, 0.05);
  --card-border: rgba(255, 255, 255, 0.08);
  --accent: #888;
}

body.theme-neutral {
  --bg-color: #1a1a2e;
  --text-color: #e0e0e0;
  --card-bg: rgba(255, 255, 255, 0.08);
  --card-border: rgba(255, 255, 255, 0.12);
  --accent: #f0c040;
}

body.theme-bright {
  --bg-color: #f5f0e8;
  --text-color: #2d2d2d;
  --card-bg: rgba(0, 0, 0, 0.04);
  --card-border: rgba(0, 0, 0, 0.1);
  --accent: #c09520;
}

.container {
  text-align: center;
  max-width: 400px;
  width: 100%;
}

.title {
  font-size: 2.4rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  margin-bottom: 0.15rem;
}

.version {
  font-size: 0.85rem;
  opacity: 0.55;
  margin-bottom: 2rem;
}

.status-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 20px;
  padding: 2rem 1.5rem;
  backdrop-filter: blur(8px);
  transition: background var(--transition-duration) ease, border-color var(--transition-duration) ease;
}

.light-icon {
  font-size: 3.5rem;
  margin-bottom: 0.5rem;
  transition: transform var(--transition-duration) ease;
}

.light-level {
  font-size: 2rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.light-label {
  font-size: 1rem;
  opacity: 0.7;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.manual-controls {
  margin-top: 1.5rem;
}

.buttons {
  display: flex;
  gap: 0.5rem;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  border: 1px solid var(--card-border);
  background: var(--card-bg);
  color: var(--text-color);
  padding: 0.6rem 1.2rem;
  border-radius: 40px;
  font-size: 0.9rem;
  cursor: pointer;
  transition: background 0.2s ease, transform 0.15s ease, opacity 0.2s ease;
  backdrop-filter: blur(4px);
  font-family: inherit;
}

.btn:hover {
  background: var(--btn-hover);
  transform: scale(1.04);
}

.btn:active {
  transform: scale(0.96);
}

.btn.active {
  border-color: var(--accent);
  background: var(--accent);
  color: #1a1a2e;
  font-weight: 600;
}

body.theme-bright .btn.active {
  color: #fff;
}

.sensor-info {
  margin-top: 1rem;
  font-size: 0.75rem;
  opacity: 0.4;
  min-height: 1.2em;
}

.debug-toggle {
  margin-top: 1.2rem;
  background: none;
  border: none;
  color: var(--text-color);
  opacity: 0.3;
  font-size: 0.7rem;
  cursor: pointer;
  text-decoration: underline;
  font-family: inherit;
  transition: opacity 0.2s;
}

.debug-toggle:hover {
  opacity: 0.7;
}

.debug-info {
  margin-top: 0.6rem;
  text-align: left;
}

.debug-info.hidden {
  display: none;
}

.debug-content {
  background: rgba(0, 0, 0, 0.3);
  color: #aaa;
  padding: 0.6rem 0.8rem;
  border-radius: 8px;
  font-size: 0.65rem;
  line-height: 1.5;
  white-space: pre-wrap;
  overflow-x: auto;
}

.project-card {
  margin-top: 2rem;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 20px;
  padding: 1.5rem 1.5rem;
  backdrop-filter: blur(8px);
  transition: background var(--transition-duration) ease, border-color var(--transition-duration) ease;
}

.project-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
}

.project-desc {
  font-size: 0.8rem;
  opacity: 0.6;
  line-height: 1.5;
  margin-bottom: 1rem;
}

.project-links {
  display: flex;
  gap: 0.6rem;
  justify-content: center;
}

.btn-link {
  text-decoration: none;
  display: inline-block;
}