@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;700&family=Instrument+Serif:ital@0;1&display=swap');

:root {
  --bg: #ffffff;
  --text-primary: #000000;
  --text-secondary: #6e6e73;
  --accent: #000000;
  --border: #e5e5e7;
  --toggle-bg: #f5f5f7;
  --toggle-active: #000000;
}

body.dark {
  --bg: #000000;
  --text-primary: #ffffff;
  --text-secondary: #8e8e93;
  --accent: #ffffff;
  --border: #2c2c2e;
  --toggle-bg: #1c1c1e;
  --toggle-active: #ffffff;
}

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

body {
  font-family: 'JetBrains Mono', monospace;
  background: var(--bg);
  color: var(--text-primary);
  transition: background 0.3s ease, color 0.3s ease;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 2rem 2.5rem;
  border-bottom: 1px solid var(--border);
}

.left {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

#productSelect {
  background: var(--toggle-bg);
  border: 1px solid var(--border);
  color: var(--text-primary);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.9rem;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
}

#productSelect:hover {
  border-color: var(--accent);
}

#themeToggle {
  background: var(--toggle-bg);
  border: 1px solid var(--border);
  color: var(--text-primary);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
  position: relative;
}

#themeToggle:hover {
  border-color: var(--accent);
  transform: rotate(15deg);
}

#themeToggle svg {
  position: absolute;
  transition: opacity 0.3s ease, transform 0.3s ease;
}

body.light #themeToggle .sun {
  opacity: 1;
  transform: rotate(0deg);
}

body.light #themeToggle .moon {
  opacity: 0;
  transform: rotate(-90deg);
}

body.dark #themeToggle .sun {
  opacity: 0;
  transform: rotate(90deg);
}

body.dark #themeToggle .moon {
  opacity: 1;
  transform: rotate(0deg);
}

main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 4rem 2.5rem;
  gap: 4rem;
  max-width: 800px;
  width: 100%;
  margin: 0 auto;
}

/* Price Picker */
#pricePicker {
  width: 100%;
  text-align: center;
}

.price-display {
  margin-bottom: 2.5rem;
}

.price-value {
  font-family: 'Instrument Serif', serif;
  font-size: 5rem;
  font-weight: 400;
  line-height: 1;
  margin-bottom: 0.5rem;
  letter-spacing: -0.03em;
}

.price-subtext {
  font-size: 0.85rem;
  color: var(--text-secondary);
  text-transform: lowercase;
}

.price-slider-container {
  position: relative;
  width: 100%;
  padding: 1.5rem 0;
}

#priceSlider {
  width: 100%;
  height: 2px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--border);
  outline: none;
  border-radius: 2px;
  cursor: pointer;
}

#priceSlider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 24px;
  height: 24px;
  background: var(--accent);
  border: 3px solid var(--bg);
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 0 0 1px var(--border);
  transition: all 0.2s ease;
}

#priceSlider::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

#priceSlider::-moz-range-thumb {
  width: 24px;
  height: 24px;
  background: var(--accent);
  border: 3px solid var(--bg);
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 0 0 1px var(--border);
  transition: all 0.2s ease;
}

#priceSlider::-moz-range-thumb:hover {
  transform: scale(1.2);
}

.price-ticks {
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  transform: translateY(-50%);
  display: flex;
  justify-content: space-between;
  pointer-events: none;
  padding: 0 12px;
}

.price-tick {
  width: 2px;
  height: 8px;
  background: var(--border);
  border-radius: 1px;
}

/* Toggles */
#toggles {
  width: 100%;
  min-height: 120px;
}

.toggles-label {
  font-size: 0.75rem;
  color: var(--text-secondary);
  text-transform: lowercase;
  margin-bottom: 1.5rem;
  text-align: center;
  letter-spacing: 0.05em;
  opacity: 1;
  transition: opacity 0.2s ease;
}

.toggles-label.hidden {
  opacity: 0;
}

.toggles-container {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
  min-height: 60px;
}

.toggle-btn {
  background: var(--toggle-bg);
  border: 1px solid var(--border);
  color: var(--text-primary);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  padding: 0.75rem 1.5rem;
  border-radius: 24px;
  cursor: pointer;
  transition: all 0.2s ease;
  text-transform: lowercase;
}

.toggle-btn:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.toggle-btn.active {
  background: var(--toggle-active);
  color: var(--bg);
  border-color: var(--toggle-active);
}

/* Result */
#result {
  width: 100%;
  text-align: center;
  padding: 3rem 0;
  border-top: 1px solid var(--border);
  opacity: 0;
  animation: fadeIn 0.5s ease forwards;
}

@keyframes fadeIn {
  to {
    opacity: 1;
  }
}

.result-label {
  font-size: 0.75rem;
  color: var(--text-secondary);
  text-transform: lowercase;
  margin-bottom: 1rem;
  letter-spacing: 0.05em;
}

.result-model {
  font-family: 'Instrument Serif', serif;
  font-size: 3rem;
  font-weight: 400;
  line-height: 1.2;
  letter-spacing: -0.02em;
  transition: opacity 0.3s ease;
}

.result-model.updating {
  opacity: 0.5;
}

/* Footer */
footer {
  padding: 2rem 2.5rem;
  text-align: center;
  border-top: 1px solid var(--border);
}

#ytLink {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.85rem;
  text-transform: lowercase;
  transition: color 0.2s ease;
  display: inline-block;
}

#ytLink:hover {
  color: var(--text-primary);
}

/* Responsive */
@media (max-width: 640px) {
  header {
    padding: 1.5rem;
  }

  .left {
    gap: 1rem;
  }

  .logo {
    font-size: 1.25rem;
  }

  main {
    padding: 2rem 1.5rem;
    gap: 3rem;
  }

  .price-value {
    font-size: 3.5rem;
  }

  .result-model {
    font-size: 2rem;
  }

  .toggles-container {
    gap: 0.5rem;
  }

  .toggle-btn {
    font-size: 0.8rem;
    padding: 0.6rem 1.2rem;
  }
}