:root {
  --bg-color: #f4f7f6;
  --text-color: #333;
  --header-bg: #fff;
  --container-bg: #fff;
  --ball-bg: #e0e0e0;
  --ball-text: #333;
  --btn-bg: #4a90e2;
  --btn-text: #fff;
  --btn-hover: #357abd;
}

body.dark {
  --bg-color: #1a1a1a;
  --text-color: #f4f7f6;
  --header-bg: #2d2d2d;
  --container-bg: #2d2d2d;
  --ball-bg: #444;
  --ball-text: #f4f7f6;
  --btn-bg: #357abd;
  --btn-text: #fff;
  --btn-hover: #4a90e2;
}

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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  transition: background-color 0.3s, color 0.3s;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
}

.container {
  background-color: var(--container-bg);
  padding: 2rem;
  border-radius: 12px;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
  text-align: center;
  max-width: 500px;
  width: 90%;
  transition: background-color 0.3s;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
}

h1 {
  font-size: 1.5rem;
}

#theme-toggle {
  padding: 0.5rem 1rem;
  border: none;
  border-radius: 20px;
  background-color: var(--btn-bg);
  color: var(--btn-text);
  cursor: pointer;
  font-size: 0.8rem;
  transition: background-color 0.2s;
}

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

#ball-container {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.ball {
  width: 50px;
  height: 50px;
  background-color: var(--ball-bg);
  color: var(--ball-text);
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  font-weight: bold;
  font-size: 1.2rem;
  transition: transform 0.2s, background-color 0.3s, color 0.3s;
  box-shadow: inset -3px -3px 5px rgba(0,0,0,0.1);
}

.ball.active {
  transform: scale(1.1);
}

#generate-btn {
  padding: 1rem 2rem;
  font-size: 1.1rem;
  border: none;
  border-radius: 8px;
  background-color: var(--btn-bg);
  color: var(--btn-text);
  cursor: pointer;
  transition: background-color 0.2s, transform 0.1s;
}

#generate-btn:hover {
  background-color: var(--btn-hover);
}

#generate-btn:active {
  transform: scale(0.98);
}

/* Partnership Form Styles */
hr {
  margin: 2rem 0;
  border: 0;
  border-top: 1px solid var(--ball-bg);
}

#partnership-section {
  text-align: left;
  margin-top: 2rem;
}

#partnership-section h2 {
  text-align: center;
  margin-bottom: 1.5rem;
  font-size: 1.2rem;
}

.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
  font-weight: bold;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.8rem;
  border: 1px solid var(--ball-bg);
  border-radius: 6px;
  background-color: var(--container-bg);
  color: var(--text-color);
  font-family: inherit;
  font-size: 0.9rem;
  transition: border-color 0.2s;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--btn-bg);
}

.form-group textarea {
  height: 100px;
  resize: vertical;
}

#submit-btn {
  width: 100%;
  padding: 0.8rem;
  border: none;
  border-radius: 6px;
  background-color: var(--btn-bg);
  color: var(--btn-text);
  font-size: 1rem;
  font-weight: bold;
  cursor: pointer;
  transition: background-color 0.2s;
}

#submit-btn:hover {
  background-color: var(--btn-hover);
}

#form-status {
  margin-top: 1rem;
  text-align: center;
  font-size: 0.9rem;
}

#form-status.success {
  color: #28a745;
}

#form-status.error {
  color: #dc3545;
}

#comments-section {
  margin-top: 2rem;
}

#comments-section h2 {
  text-align: center;
  margin-bottom: 1.5rem;
  font-size: 1.2rem;
}

/* Color classes for balls based on ranges (optional polish) */
.range-1 { background-color: #fbc02d; color: #000; } /* 1-10 */
.range-2 { background-color: #1976d2; color: #fff; } /* 11-20 */
.range-3 { background-color: #d32f2f; color: #fff; } /* 21-30 */
.range-4 { background-color: #7b1fa2; color: #fff; } /* 31-40 */
.range-5 { background-color: #388e3c; color: #fff; } /* 41-45 */