:root {
  --bg: #f5f7fb;
  --card: #ffffff;
  --text: #2c3e50;
  --accent: #4a90e2;
  --accent-hover: #357abd;
  --border: #e2e8f0;
  --label-bg: #edf2f7;
  --label-text: #4a5568;
  --row-bg: #f8fafc;
  --transition-speed: 0.3s;
}

/* Dark Theme Variables */
body.dark-theme {
  --bg: #0f172a;
  --card: #1e293b;
  --text: #f1f5f9;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --border: #334155;
  --label-bg: #334155;
  --label-text: #cbd5e1;
  --row-bg: #0f172a;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease;
}

/* Theme Toggle Styling */
.theme-switch-wrapper {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  z-index: 100;
}

#themeToggleBtn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.3);
  color: white;
  padding: 0.5rem 1rem;
  border-radius: 50px;
  font-size: 0.9rem;
  font-weight: 700;
  width: auto;
  cursor: pointer;
  transition: all 0.25s ease;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

#themeToggleBtn:hover {
  background: rgba(255, 255, 255, 0.35);
  transform: translateY(-2px);
  box-shadow: 0 6px 15px rgba(0, 0, 0, 0.15);
}

#themeToggleBtn:active {
  transform: translateY(0);
}

/* Custom dark mode header adjustment */
body.dark-theme .page-header {
  background: linear-gradient(135deg, #1e293b, #0f172a);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

body.dark-theme #themeToggleBtn {
  background: rgba(15, 23, 42, 0.5);
  border-color: rgba(255, 255, 255, 0.1);
  color: #cbd5e1;
}

body.dark-theme #themeToggleBtn:hover {
  background: rgba(15, 23, 42, 0.7);
}

.page-header {
  text-align: center;
  padding: 4rem 1rem 3rem;
  background: linear-gradient(135deg, #3182ce, #63b3ed);
  color: white;
  box-shadow: 0 4px 12px rgba(49, 130, 206, 0.15);
  transition: background var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
}

.page-header h1 {
  margin: 0 0 0.75rem;
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.05em;
}

.page-header p {
  margin: 0;
  font-size: 1.05rem;
  opacity: 0.9;
}

.content {
  max-width: 680px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 4rem;
}

section {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 2rem;
  margin-bottom: 2rem;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.03);
  transition: background-color var(--transition-speed) ease, border-color var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
}

section h2, section h3 {
  margin-top: 0;
  font-weight: 700;
  color: var(--text);
  transition: color var(--transition-speed) ease;
}

.control-panel p {
  color: var(--text);
  opacity: 0.8;
  margin-bottom: 1.5rem;
  line-height: 1.5;
  transition: color var(--transition-speed) ease;
}

button {
  background: var(--accent);
  color: white;
  border: none;
  width: 100%;
  padding: 1.1rem;
  border-radius: 12px;
  font-size: 1.1rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 4px 14px rgba(74, 144, 226, 0.3);
}

button:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(74, 144, 226, 0.4);
  background: var(--accent-hover);
}

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

.placeholder-text {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--text);
  opacity: 0.6;
  font-size: 1.05rem;
  border: 2px dashed var(--border);
  border-radius: 12px;
  background: transparent;
  transition: border-color var(--transition-speed) ease, background-color var(--transition-speed) ease;
}

#lotto-container {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.game-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  background: var(--row-bg);
  border: 1px solid var(--border);
  border-radius: 14px;
  opacity: 0;
  transform: translateY(15px);
  animation: slideUp 0.4s ease forwards;
  transition: background-color var(--transition-speed) ease, border-color var(--transition-speed) ease;
}

.game-label {
  background: var(--label-bg);
  color: var(--label-text);
  padding: 0.4rem 0.8rem;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 700;
  min-width: 65px;
  text-align: center;
  transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease;
}

.balls-container {
  display: flex;
  gap: 0.5rem;
}

/* 3D Lotto Ball Styles */
.ball {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  font-size: 1.05rem;
  font-weight: 800;
  color: white;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.25);
  box-shadow: inset -3px -3px 6px rgba(0, 0, 0, 0.25), 
              inset 3px 3px 6px rgba(255, 255, 255, 0.35),
              0 4px 8px rgba(0, 0, 0, 0.15);
  opacity: 0;
  transform: scale(0.6);
  animation: popIn 0.35s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
}

/* Color Ranges based on official Korean Lotto */
.ball-yellow {
  background: radial-gradient(circle at 35% 35%, #ffd54f 0%, #f57f17 100%);
}

.ball-blue {
  background: radial-gradient(circle at 35% 35%, #4fc3f7 0%, #0288d1 100%);
}

.ball-red {
  background: radial-gradient(circle at 35% 35%, #ff8a80 0%, #d32f2f 100%);
}

.ball-grey {
  background: radial-gradient(circle at 35% 35%, #e0e0e0 0%, #616161 100%);
}

.ball-green {
  background: radial-gradient(circle at 35% 35%, #81c784 0%, #2e7d32 100%);
}

/* Contact Form Styling */
.contact-section {
  margin-top: 2rem;
}

.contact-section p {
  color: var(--text);
  opacity: 0.8;
  margin-bottom: 1.5rem;
  line-height: 1.5;
  transition: color var(--transition-speed) ease;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group label {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text);
  opacity: 0.9;
  transition: color var(--transition-speed) ease;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.85rem 1rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background-color: var(--card);
  color: var(--text);
  font-family: inherit;
  font-size: 0.95rem;
  transition: all var(--transition-speed) ease;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text);
  opacity: 0.4;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.15);
}

.submit-btn {
  background: var(--accent);
  color: white;
  border: none;
  width: 100%;
  padding: 1rem;
  border-radius: 12px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 4px 14px rgba(74, 144, 226, 0.3);
}

.submit-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(74, 144, 226, 0.4);
  background: var(--accent-hover);
}

.submit-btn:active {
  transform: translateY(0);
}

.submit-btn:disabled {
  cursor: wait;
  opacity: 0.7;
  transform: none;
}

.optional {
  font-weight: 400;
  opacity: 0.65;
}

.honeypot {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
}

.form-status {
  min-height: 1.5rem;
  margin: -0.25rem 0 0;
  font-size: 0.92rem;
  font-weight: 600;
}

.form-status.success { color: #15803d; }
.form-status.error { color: #dc2626; }
body.dark-theme .form-status.success { color: #86efac; }
body.dark-theme .form-status.error { color: #fca5a5; }

/* Keyframe Animations */
@keyframes slideUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes popIn {
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* Responsive adjustments */
@media (max-width: 480px) {
  .theme-switch-wrapper {
    top: 0.75rem;
    right: 0.75rem;
  }

  #themeToggleBtn {
    padding: 0.4rem 0.8rem;
    font-size: 0.8rem;
  }

  .game-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 1rem;
  }
  
  .balls-container {
    width: 100%;
    justify-content: space-between;
  }
  
  .ball {
    width: 34px;
    height: 34px;
    font-size: 0.95rem;
  }
  
  .form-group input,
  .form-group textarea {
    padding: 0.75rem 0.9rem;
    font-size: 0.9rem;
  }
}