:root {
  --primary-color: #4a90e2;
  --bg-gradient: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  --card-bg: #ffffff;
  --text-main: #333333;
  --text-muted: #777777;
  --shadow: rgba(0, 0, 0, 0.1);
  
  /* Lotto Ball Colors */
  --ball-1: #fbc400;
  --ball-11: #69c8f2;
  --ball-21: #ff7272;
  --ball-31: #aaaaaa;
  --ball-41: #b0d840;
}

[data-theme="dark"] {
  --bg-gradient: linear-gradient(135deg, #1a1c20 0%, #0f1013 100%);
  --card-bg: #25282e;
  --text-main: #f0f0f0;
  --text-muted: #aaaaaa;
  --shadow: rgba(0, 0, 0, 0.4);
}

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

body {
  font-family: 'Noto Sans KR', 'Montserrat', sans-serif;
  background: var(--bg-gradient);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-main);
  transition: background 0.3s ease, color 0.3s ease;
}

.app-wrapper {
  width: 100%;
  max-width: 500px;
  padding: 20px;
}

.card {
  background: var(--card-bg);
  border-radius: 24px;
  padding: 40px;
  box-shadow: 0 10px 30px var(--shadow);
  text-align: center;
  position: relative;
  transition: background 0.3s ease, box-shadow 0.3s ease;
}

.theme-toggle {
  position: absolute;
  top: 20px;
  right: 20px;
}

#theme-btn {
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
}

#theme-btn:hover {
  background: rgba(0, 0, 0, 0.05);
}

[data-theme="dark"] #theme-btn:hover {
  background: rgba(255, 255, 255, 0.1);
}

.icon-sun, .icon-moon {
  font-size: 1.4rem;
}

[data-theme="dark"] .icon-sun { display: none; }
body:not([data-theme="dark"]) .icon-moon { display: none; }

header h1 {
  font-family: 'Montserrat', sans-serif;
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: 8px;
  letter-spacing: -1px;
}

header .subtitle {
  color: var(--text-main);
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 20px;
}

.intro-section {
  background: rgba(74, 144, 226, 0.05);
  border-radius: 16px;
  padding: 20px;
  margin-bottom: 30px;
  line-height: 1.6;
  text-align: left;
}

[data-theme="dark"] .intro-section {
  background: rgba(255, 255, 255, 0.05);
}

.intro-section p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.intro-section strong {
  color: var(--primary-color);
}

.numbers-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 15px;
  min-height: 60px;
  margin-bottom: 40px;
  width: 100%;
}

.numbers-row {
  display: flex;
  justify-content: center;
  gap: 12px;
  width: 100%;
}

.game-selector {
  margin-bottom: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 15px;
}

.game-selector label {
  font-weight: 700;
  color: var(--text-main);
}

.game-selector select {
  padding: 8px 16px;
  border-radius: 8px;
  border: 1px solid rgba(0,0,0,0.1);
  background: var(--card-bg);
  color: var(--text-main);
  font-family: inherit;
  font-size: 1rem;
  cursor: pointer;
  outline: none;
}

[data-theme="dark"] .game-selector select {
  border: 1px solid rgba(255,255,255,0.1);
}

.placeholder {
  color: var(--text-muted);
  opacity: 0.5;
  font-size: 1.1rem;
  font-weight: 500;
}

.ball {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Montserrat', sans-serif;
  font-weight: 700;
  font-size: 1.2rem;
  color: white;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
  box-shadow: inset -4px -4px 8px rgba(0, 0, 0, 0.2), 
              4px 4px 10px rgba(0, 0, 0, 0.1);
  animation: popIn 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
  opacity: 0;
  transform: scale(0.5);
}

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

.ball.range-1 { background: var(--ball-1); }
.ball.range-11 { background: var(--ball-11); }
.ball.range-21 { background: var(--ball-21); }
.ball.range-31 { background: var(--ball-31); }
.ball.range-41 { background: var(--ball-41); }

.actions {
  display: flex;
  gap: 10px;
}

.actions button {
  flex: 2;
  background: var(--primary-color);
  color: white;
  border: none;
  padding: 16px 32px;
  font-size: 1.1rem;
  font-weight: 700;
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: 0 4px 15px rgba(74, 144, 226, 0.3);
}

.actions button.secondary-btn {
  flex: 1;
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--text-muted);
  box-shadow: none;
}

.actions button.secondary-btn:hover {
  background: rgba(0, 0, 0, 0.05);
  color: var(--text-main);
  border-color: var(--text-main);
  transform: translateY(-2px);
}

[data-theme="dark"] .actions button.secondary-btn:hover {
  background: rgba(255, 255, 255, 0.05);
}

.actions button:hover {
  background: #357abd;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(74, 144, 226, 0.4);
}

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

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

.game-row-wrapper {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 20px;
  border-radius: 16px;
  background: rgba(74, 144, 226, 0.03);
  border: 1px solid rgba(74, 144, 226, 0.1);
  animation: fadeIn 0.5s ease forwards;
}

[data-theme="dark"] .game-row-wrapper {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.game-label {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--primary-color);
  background: rgba(74, 144, 226, 0.1);
  padding: 4px 12px;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

[data-theme="dark"] .game-label {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-main);
}

/* Navbar Styles */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: var(--card-bg);
  box-shadow: 0 2px 10px var(--shadow);
  z-index: 1000;
  padding: 1rem 0;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 20px;
}

.nav-logo {
  font-family: 'Montserrat', sans-serif;
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--primary-color);
  text-decoration: none;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 20px;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-main);
  font-weight: 500;
  font-size: 0.9rem;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--primary-color);
}

/* App Wrapper adjustment for fixed navbar */
body {
  padding-top: 80px;
  flex-direction: column;
}

.app-wrapper {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Info Section Styles */
.info-section {
  margin-top: 40px;
  text-align: left;
  border-top: 1px solid rgba(0,0,0,0.05);
  padding-top: 30px;
}

[data-theme="dark"] .info-section {
  border-top: 1px solid rgba(255,255,255,0.05);
}

.info-section h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
  color: var(--primary-color);
}

.info-section p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 20px;
}

/* Footer Styles */
.footer {
  width: 100%;
  background: var(--card-bg);
  padding: 40px 20px;
  margin-top: 40px;
  border-top: 1px solid rgba(0,0,0,0.05);
}

[data-theme="dark"] .footer {
  border-top: 1px solid rgba(255,255,255,0.05);
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  text-align: center;
}

.footer p {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 15px;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 20px;
}

.footer-links a {
  text-decoration: none;
  font-size: 0.8rem;
  color: var(--text-muted);
  transition: color 0.2s;
}

.footer-links a:hover {
  color: var(--primary-color);
}

@media (max-width: 600px) {
  .nav-links {
    display: none; /* Mobile menu would be better but keeping it simple for now */
  }
}