body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  margin: 0;
  padding: 0;
  transition: background-color 0.3s, color 0.3s;
}

/* Light Mode (Default) */
body {
  background-color: #f4f7f9;
  color: #2d3748;
}

.sidebar {
  background-color: #ffffff;
  border-right-color: #e2e8f0;
}

.sidebar-title, h1, #lotto-info h3 {
  color: #2c5282;
}

.lottery-list-item:hover {
  background-color: #edf2f7;
}

.lottery-list-item.active {
  background-color: #2c5282;
  color: #ffffff;
}

#lotto-info, .history-item {
    background-color: #ffffff;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

/* Dark Mode */
body.dark-mode {
  background-color: #1a202c;
  color: #e2e8f0;
}

body.dark-mode .sidebar {
  background-color: #2d3748;
  border-right-color: #4a5568;
}

body.dark-mode .sidebar-title, body.dark-mode h1, body.dark-mode #lotto-info h3 {
  color: #63b3ed;
}

body.dark-mode .lottery-list-item {
  color: #e2e8f0;
}

body.dark-mode .lottery-list-item:hover {
  background-color: #4a5568;
}

body.dark-mode .lottery-list-item.active {
  background-color: #63b3ed;
  color: #1a202c;
}

body.dark-mode #lotto-info, body.dark-mode .history-item {
    background-color: #2d3748;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.15);
}

/* General Styles */
.container { display: flex; height: 100vh; }
.sidebar { width: 280px; padding: 25px; box-shadow: 2px 0 5px rgba(0,0,0,0.05); display: flex; flex-direction: column; justify-content: space-between; transition: background-color 0.3s, border-color 0.3s; }
.sidebar-title { font-size: 1.8em; margin: 0 0 20px 0; }
.lottery-list { list-style: none; padding: 0; margin: 0; }
.lottery-list-item { padding: 15px 20px; font-size: 1.1em; font-weight: 500; border-radius: 8px; cursor: pointer; transition: background-color 0.2s, color 0.2s; margin-bottom: 10px; }
.main-content { flex-grow: 1; padding: 40px; overflow-y: auto; display: flex; flex-direction: column; align-items: center; }
#lotto-display { width: 100%; max-width: 800px; text-align: center; margin-bottom: 40px; }
h1 { font-size: 2.8em; margin-bottom: 10px; }
p { font-size: 1.2em; max-width: 700px; line-height: 1.6; margin: 0 auto 30px auto; }
#lotto-info { padding: 30px; border-radius: 12px; width: 100%; max-width: 800px; margin-top: 20px; transition: background-color 0.3s; }
#lotto-info h3 { font-size: 1.5em; margin: 0 0 15px 0; border-bottom: 2px solid; padding-bottom: 10px; transition: color 0.3s; }
#lotto-info p { font-size: 1em; line-height: 1.7; margin: 0 0 15px 0; }

#theme-toggle {
    background-color: transparent;
    border: 2px solid #2c5282;
    color: #2c5282;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 24px;
    align-self: center;
    transition: all 0.3s;
}

body.dark-mode #theme-toggle {
    border-color: #63b3ed;
    color: #63b3ed;
}

#theme-toggle:hover { transform: scale(1.1); }

.ball-color-1 { background-color: #e53e3e; } /* Red */
.ball-color-2 { background-color: #3182ce; } /* Blue */
.ball-color-3 { background-color: #38a169; } /* Green */
.ball-color-4 { background-color: #dd6b20; } /* Orange */
.ball-color-5 { background-color: #805ad5; } /* Purple */
.special-ball { background-color: #f6e05e; color: #2d3748 !important; border: 2px solid #d69e2e !important; }