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

:root {
  --bg: #F0F7EE;
  --primary: #2D6A4F;
  --primary-hover: #1B5E40;
  --secondary: #5A7248;
  --text: #2B2D2B;
  --surface: #E2EDDF;
  --border: #B5C9AD;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  min-height: 100vh;
  padding: 2rem 1rem 12rem;
  background-image:
    linear-gradient(to bottom, var(--bg) 60%, transparent 100%),
    url('assets/bg-image.png');
  background-position: top center, bottom center;
  background-repeat: no-repeat, no-repeat;
  background-size: 100% 100%, 100% 33vh;
  background-attachment: fixed, fixed;
}

.container {
  max-width: 700px;
  margin: 0 auto;
}

/* Header */
.header {
  text-align: center;
  margin-bottom: 2.5rem;
}

.header-image {
  display: block;
  margin: 0 auto 1rem;
  max-width: 100%;
  height: auto;
  border-radius: 12px;
}

.header h1 {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 2.75rem;
  color: var(--primary);
  letter-spacing: 0.02em;
  margin-bottom: 0.25rem;
}

.tagline {
  font-family: Georgia, "Times New Roman", serif;
  font-style: italic;
  font-size: 1.1rem;
  color: var(--secondary);
}

/* Controls card */
.controls {
  background: white;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  box-shadow: 0 2px 8px rgba(62, 39, 35, 0.08);
}

.control-group {
  margin-bottom: 1.25rem;
}

.control-group:last-of-type {
  margin-bottom: 1.5rem;
}

.control-group label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
  color: var(--text);
}

.slider-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem 0;
}

.slider-display {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--primary);
  min-width: 2ch;
  text-align: center;
}

.slider-wrapper {
  position: relative;
  flex: 1;
}

/* Track */
.slider-wrapper input[type="range"] {
  -webkit-appearance: none;
  width: 100%;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}

/* Active track (filled portion) — uses a gradient trick */
.slider-wrapper input[type="range"]::-webkit-slider-runnable-track {
  height: 4px;
  border-radius: 2px;
}

/* Thumb */
.slider-wrapper input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--primary);
  border: none;
  margin-top: -8px;
  cursor: pointer;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
  transition: box-shadow 0.15s ease;
}

.slider-wrapper input[type="range"]::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--primary);
  border: none;
  cursor: pointer;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
  transition: box-shadow 0.15s ease;
}

.slider-wrapper input[type="range"]::-moz-range-track {
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  border: none;
}

/* Hover ring */
.slider-wrapper input[type="range"]:hover::-webkit-slider-thumb {
  box-shadow: 0 0 0 8px rgba(45, 106, 79, 0.15), 0 1px 3px rgba(0, 0, 0, 0.2);
}

.slider-wrapper input[type="range"]:hover::-moz-range-thumb {
  box-shadow: 0 0 0 8px rgba(45, 106, 79, 0.15), 0 1px 3px rgba(0, 0, 0, 0.2);
}

/* Active press ring */
.slider-wrapper input[type="range"]:active::-webkit-slider-thumb {
  box-shadow: 0 0 0 12px rgba(45, 106, 79, 0.2), 0 1px 3px rgba(0, 0, 0, 0.2);
}

.slider-wrapper input[type="range"]:active::-moz-range-thumb {
  box-shadow: 0 0 0 12px rgba(45, 106, 79, 0.2), 0 1px 3px rgba(0, 0, 0, 0.2);
}

.slider-wrapper input[type="range"]:focus-visible::-webkit-slider-thumb {
  box-shadow: 0 0 0 8px rgba(45, 106, 79, 0.15), 0 0 0 3px var(--primary);
}

.slider-wrapper input[type="range"]:focus-visible::-moz-range-thumb {
  box-shadow: 0 0 0 8px rgba(45, 106, 79, 0.15), 0 0 0 3px var(--primary);
}

.slider-wrapper input[type="range"]:focus-visible {
  outline: none;
}


/* Tooltip */
.slider-tooltip {
  position: absolute;
  top: -38px;
  background: var(--primary);
  color: var(--bg);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.15s ease;
  white-space: nowrap;
  transform: translateX(-50%);
}

.slider-tooltip::after {
  content: "";
  position: absolute;
  bottom: -5px;
  left: 50%;
  transform: translateX(-50%);
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-top: 5px solid var(--primary);
}

.slider-wrapper:hover .slider-tooltip,
.slider-wrapper:active .slider-tooltip,
.slider-wrapper:focus-within .slider-tooltip {
  opacity: 1;
}

.toggle-row {
  display: flex;
  gap: 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.toggle-btn {
  flex: 1;
  padding: 0.5rem 0.75rem;
  border: none;
  background: white;
  color: var(--text);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}

.toggle-btn:not(:last-child) {
  border-right: 1px solid var(--border);
}

.toggle-btn:hover {
  background: var(--surface);
}

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

.toggle-btn:focus-visible {
  outline: 3px solid var(--primary);
  outline-offset: -3px;
}

.btn-generate {
  display: block;
  width: 100%;
  padding: 0.85rem;
  background: var(--primary);
  color: var(--bg);
  border: none;
  border-radius: 8px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  cursor: pointer;
  transition: background 0.15s ease;
}

.btn-generate:hover {
  background: var(--primary-hover);
}

.btn-generate:active {
  transform: translateY(1px);
}

.btn-generate:focus-visible {
  outline: 3px solid var(--primary);
  outline-offset: 2px;
}

/* Output area */
.output-section {
  display: none;
}

.output-section.visible {
  display: block;
}

.output-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
}

.output-header h2 {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.2rem;
  color: var(--primary);
}

.btn-copy {
  padding: 0.45rem 1rem;
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-copy:hover {
  background: var(--primary);
  color: var(--bg);
}

.btn-copy:focus-visible {
  outline: 3px solid var(--primary);
  outline-offset: 2px;
}

.btn-copy.copied {
  background: var(--secondary);
  border-color: var(--secondary);
  color: var(--bg);
}

.output-text {
  background: white;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  line-height: 1.7;
  font-size: 1rem;
  white-space: pre-wrap;
  box-shadow: 0 2px 8px rgba(62, 39, 35, 0.08);
}

/* Decorative horseshoe divider */
.divider {
  text-align: center;
  margin: 2rem 0;
}

.divider-img {
  max-width: 300px;
  height: auto;
  opacity: 0.7;
}

/* Links */
a {
  color: var(--primary);
  text-decoration-color: var(--border);
  text-underline-offset: 2px;
  transition: color 0.15s ease, text-decoration-color 0.15s ease;
}

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

a:active {
  color: var(--text);
}

/* Footer */
.footer {
  text-align: center;
  margin-top: 2.5rem;
  font-size: 1rem;
  color: #1A3A2A;
}

.footer a {
  font-weight: 700;
}

/* Responsive */
@media (max-width: 480px) {
  .header h1 {
    font-size: 2rem;
  }

  .controls {
    padding: 1rem;
  }

  .range-row {
    flex-wrap: wrap;
  }
}