:root {
  /* Light Mode Colors (Defaults) */
  --bg-gradient-start: #1a2a44;
  --bg-gradient-end: #2b3a67;
  --card-bg: #ffffff;
  --text-primary: #2b3a67;
  --text-secondary: #666666;
  --text-placeholder: #cccccc;
  --btn-bg: #2b3a67;
  --btn-hover: #3d4d7e;
  --btn-text: #ffffff;

  /* Ball Colors (Remain the same) */
  --yellow: #fbc400;
  --blue: #69c8f2;
  --red: #ff7272;
  --gray: #aaaaaa;
  --green: #b0d840;
}

/* Dark Mode Overrides */
[data-theme="dark"] {
  --bg-gradient-start: #0f172a;
  --bg-gradient-end: #1e293b;
  --card-bg: #1e293b;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-placeholder: #475569;
  --btn-bg: #334155;
  --btn-hover: #475569;
  --btn-text: #f8fafc;
}

body {
  font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
  color: var(--text-primary);
  transition: background 0.3s ease;
}

.container {
  background: var(--card-bg);
  padding: 2.5rem;
  border-radius: 20px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.3);
  text-align: center;
  max-width: 500px;
  width: 90%;
  transition: background 0.3s ease, color 0.3s ease;
}

header {
  position: relative;
}

.theme-toggle {
  position: absolute;
  top: -1.5rem;
  right: -1.5rem;
}

#theme-btn {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 50%;
  transition: background 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

#theme-btn:hover {
  background: rgba(128, 128, 128, 0.1);
}

/* Hide icons based on theme */
[data-theme="dark"] .icon-sun { display: block; }
[data-theme="dark"] .icon-moon { display: none; }
.icon-sun { display: none; }
.icon-moon { display: block; }

header h1 {
  margin: 0;
  color: var(--text-primary);
  font-size: 2.5rem;
  font-weight: 800;
}

header p {
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

#numbers-container {
  display: flex;
  justify-content: center;
  gap: 12px;
  min-height: 80px;
  margin-bottom: 2rem;
  align-items: center;
  flex-wrap: wrap;
}

.placeholder {
  color: var(--text-placeholder);
  font-size: 1.1rem;
}

.ball {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  color: white;
  font-weight: bold;
  font-size: 1.2rem;
  box-shadow: inset -4px -4px 8px rgba(0,0,0,0.2), 0 4px 10px rgba(0,0,0,0.1);
  text-shadow: 1px 1px 2px rgba(0,0,0,0.3);
  animation: popIn 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
}

@keyframes popIn {
  from { transform: scale(0) rotate(-180deg); opacity: 0; }
  to { transform: scale(1) rotate(0); opacity: 1; }
}

.ball.range-1 { background-color: var(--yellow); }
.ball.range-2 { background-color: var(--blue); }
.ball.range-3 { background-color: var(--red); }
.ball.range-4 { background-color: var(--gray); }
.ball.range-5 { background-color: var(--green); }

.controls button {
  background-color: var(--btn-bg);
  color: var(--btn-text);
  border: none;
  padding: 1rem 2.5rem;
  font-size: 1.1rem;
  font-weight: 600;
  border-radius: 50px;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

.controls button:hover {
  transform: translateY(-2px);
  background-color: var(--btn-hover);
  box-shadow: 0 6px 20px rgba(0,0,0,0.3);
}

.controls button:active {
  transform: translateY(0);
}

.controls button:disabled {
  background-color: #ccc;
  cursor: not-allowed;
  box-shadow: none;
}

.divider {
  border: none;
  border-top: 1px solid var(--text-placeholder);
  margin: 2.5rem 0;
  opacity: 0.3;
}

.inquiry-section {
  text-align: left;
}

.inquiry-section h3 {
  color: var(--text-primary);
  margin-bottom: 1rem;
  font-size: 1.25rem;
  font-weight: 700;
}

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

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

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.8rem;
  border-radius: 8px;
  border: 1px solid var(--text-placeholder);
  background-color: var(--card-bg);
  color: var(--text-primary);
  box-sizing: border-box;
  font-family: inherit;
  font-size: 0.95rem;
  transition: border-color 0.2s;
}

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

.submit-btn {
  width: 100%;
  padding: 0.8rem;
  border-radius: 8px;
  border: none;
  background-color: var(--btn-bg);
  color: var(--btn-text);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.submit-btn:hover {
  background-color: var(--btn-hover);
  transform: translateY(-1px);
}

.comments-section {
  margin-top: 2rem;
  min-height: 300px;
}