:root {
  --bg-color: #f8fafc;
  --container-bg: #ffffff;
  --text-color: #1e293b;
  --text-secondary: #64748b;
  --shadow-color: rgba(15, 23, 42, 0.08);
  --button-bg: #3b82f6;
  --button-hover: #2563eb;
  --accent-color: #10b981;
  --header-bg: rgba(255, 255, 255, 0.8);
  --transition-speed: 0.3s;
}

[data-theme="dark"] {
  --bg-color: #0f172a;
  --container-bg: #1e293b;
  --text-color: #f1f5f9;
  --text-secondary: #94a3b8;
  --shadow-color: rgba(0, 0, 0, 0.3);
  --button-bg: #3b82f6;
  --button-hover: #60a5fa;
  --header-bg: rgba(30, 41, 59, 0.8);
}

body {
  font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, Roboto, 'Helvetica Neue', 'Segoe UI', 'Apple SD Gothic Neo', 'Noto Sans KR', 'Malgun Gothic', sans-serif;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100vh;
  background-color: var(--bg-color);
  color: var(--text-color);
  transition: background-color var(--transition-speed), color var(--transition-speed);
  margin: 0;
  padding-top: 80px; /* Space for fixed header */
}

/* Header & Navigation */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 70px;
  background-color: var(--header-bg);
  backdrop-filter: blur(10px);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  box-shadow: 0 1px 2px var(--shadow-color);
  transition: background-color var(--transition-speed);
}

nav {
  width: 90%;
  max-width: 1000px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.25em;
  font-weight: 800;
  color: var(--button-bg);
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: 24px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-color);
  font-weight: 600;
  font-size: 0.95em;
  transition: color var(--transition-speed);
}

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

/* Main Content Layout */
main {
  width: 90%;
  max-width: 800px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 40px;
  padding-bottom: 60px;
}

.lotto-container {
  background-color: var(--container-bg);
  padding: 40px;
  border-radius: 24px;
  box-shadow: 0 20px 25px -5px var(--shadow-color), 0 10px 10px -5px var(--shadow-color);
  text-align: center;
  width: 100%;
  box-sizing: border-box;
  transition: background-color var(--transition-speed), box-shadow var(--transition-speed);
}

h1 {
  margin-top: 0;
  margin-bottom: 24px;
  font-weight: 800;
  letter-spacing: -0.025em;
}

.numbers {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 32px;
  gap: 12px;
}

.number {
  background: linear-gradient(135deg, var(--accent-color), #059669);
  color: white;
  border-radius: 50%;
  width: 55px;
  height: 55px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4em;
  font-weight: bold;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  transition: transform 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.number:hover {
  transform: scale(1.15) rotate(5deg);
}

.controls {
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: center;
}

button {
  background-color: var(--button-bg);
  color: white;
  padding: 16px 32px;
  border: none;
  border-radius: 12px;
  font-size: 1.1em;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition-speed);
  width: 100%;
  max-width: 300px;
}

button:hover {
  background-color: var(--button-hover);
  transform: translateY(-2px);
  box-shadow: 0 10px 15px -3px rgba(59, 130, 246, 0.3);
}

.theme-toggle {
  background: none;
  border: 2px solid var(--button-bg);
  color: var(--button-bg);
  padding: 10px 20px;
  font-size: 0.9em;
  width: auto;
}

.theme-toggle:hover {
  background-color: var(--button-bg);
  color: white;
  transform: none;
  box-shadow: none;
}

/* Article Section */
.article-section {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 32px;
}

article {
  background-color: var(--container-bg);
  padding: 32px;
  border-radius: 20px;
  box-shadow: 0 4px 6px var(--shadow-color);
  line-height: 1.7;
}

article h2 {
  margin-top: 0;
  color: var(--button-bg);
}

article p {
  color: var(--text-secondary);
}

/* Form Section */
.form-container {
  background-color: var(--container-bg);
  padding: 32px;
  border-radius: 20px;
  box-shadow: 0 4px 6px var(--shadow-color);
  width: 100%;
  box-sizing: border-box;
}

.form-group {
  margin-bottom: 20px;
  text-align: left;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px;
  border: 1px solid var(--text-secondary);
  border-radius: 8px;
  background-color: var(--bg-color);
  color: var(--text-color);
  box-sizing: border-box;
}

.submit-btn {
  background-color: var(--accent-color) !important;
  max-width: 100%;
}

/* Comments Section */
.comments-container {
  background-color: var(--container-bg);
  padding: 32px;
  border-radius: 20px;
  box-shadow: 0 4px 6px var(--shadow-color);
  width: 100%;
  box-sizing: border-box;
}

/* Footer */
footer {
  width: 100%;
  background-color: var(--container-bg);
  padding: 40px 0;
  margin-top: 60px;
  display: flex;
  flex-direction: column;
  align-items: center;
  border-top: 1px solid var(--shadow-color);
}

.footer-content {
  width: 90%;
  max-width: 1000px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  text-align: center;
}

.footer-links {
  display: flex;
  gap: 20px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-links a {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.9em;
}

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

.copyright {
  color: var(--text-secondary);
  font-size: 0.85em;
}