:root {
  /* Light mode colors */
  --bg-color: #f7f7f7;
  --container-bg: #ffffff;
  --text-color: #333;
  --light-text-color: #666;
  --shadow-color: rgba(0, 0, 0, 0.08);
  --kakao-btn-bg: #fee500;
  --kakao-btn-hover-bg: #fada0a;
  --footer-color: #aaa;
}

body.dark-mode {
  /* Dark mode colors */
  --bg-color: #2c2c2c;
  --container-bg: #3a3a3a;
  --text-color: #e0e0e0;
  --light-text-color: #b0b0b0;
  --shadow-color: rgba(0, 0, 0, 0.3);
  --kakao-btn-bg: #fee500; /* Kakao button color remains the same */
  --kakao-btn-hover-bg: #fada0a;
  --footer-color: #888;
}

* {
  box-sizing: border-box;
  font-family: -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo",
               "Pretendard", "Noto Sans KR", sans-serif;
  transition: background-color 0.3s ease, color 0.3s ease, box-shadow 0.3s ease;
}

body {
  margin: 0;
  height: 100vh;
  background: var(--bg-color);
  display: flex;
  justify-content: center;
  align-items: center;
  color: var(--text-color);
}

.container {
  width: 100%;
  max-width: 360px;
  background: var(--container-bg);
  padding: 32px 24px;
  border-radius: 16px;
  box-shadow: 0 10px 30px var(--shadow-color);
  text-align: center;
  position: relative;
}

h1 {
  margin: 0 0 8px;
  font-size: 24px;
  font-weight: 700;
  color: var(--text-color);
}

p {
  margin: 0 0 32px;
  font-size: 14px;
  color: var(--light-text-color);
  line-height: 1.5;
}

.kakao-btn {
  width: 100%;
  height: 48px;
  background: var(--kakao-btn-bg);
  border: none;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  color: var(--text-color); /* Ensure text color is readable on Kakao button */
}

.kakao-btn:hover {
  background: var(--kakao-btn-hover-bg);
}

.kakao-icon {
  width: 20px;
  height: 20px;
}

.footer {
  margin-top: 24px;
  font-size: 12px;
  color: var(--footer-color);
}

.theme-toggle {
  position: absolute;
  top: 10px;
  right: 10px;
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  padding: 5px;
  border-radius: 50%;
  transition: background-color 0.2s ease;
}

.theme-toggle:hover {
  background-color: rgba(0, 0, 0, 0.05);
}

body.dark-mode .theme-toggle:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

.theme-toggle .dark-icon {
  display: none;
}

body.dark-mode .theme-toggle .light-icon {
  display: none;
}

body.dark-mode .theme-toggle .dark-icon {
  display: inline-block;
}