:root {
  /* Color Palette - White & Black Premium */
  --bg-color: #000000;
  --surface-color: #111111;
  --surface-hover: #1a1a1a;
  --text-main: #ffffff;
  --text-muted: #888888;
  --border-color: #333333;
  --accent-color: #ffffff;
  --accent-text: #000000;
  --danger: #ff3366;
  --success: #00ea8d;

  /* Typography */
  --font-sans: 'Inter', 'Noto Sans KR', sans-serif;

  /* spacing */
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 2rem;
  --spacing-xl: 4rem;

  /* radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-xl: 32px;
  
  /* transitions */
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}
a:hover {
  color: var(--text-muted);
}

ul {
  list-style: none;
}

/* App Layout */
#app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

#router-view {
  flex: 1;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-md);
  animation: fadeIn 0.4s ease-out;
}

.footer {
  text-align: center;
  padding: var(--spacing-lg);
  color: var(--text-muted);
  font-size: 0.875rem;
  border-top: 1px solid var(--border-color);
}

/* Navbar */
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) var(--spacing-lg);
  border-bottom: 1px solid var(--border-color);
  background-color: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 100;
}

.navbar .logo {
  font-size: 1.5rem;
  font-weight: 900;
  letter-spacing: -1px;
  color: var(--accent-color);
}

.navbar-links {
  display: flex;
  gap: var(--spacing-lg);
  align-items: center;
}

.nav-item {
  font-weight: 500;
  font-size: 0.95rem;
  cursor: pointer;
}

.user-points {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background-color: var(--surface-color);
  padding: 0.4rem 1rem;
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-color);
  font-size: 0.9rem;
  font-weight: 700;
}

.user-points span.val {
  color: var(--success);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-normal);
  font-family: inherit;
}

.btn-primary {
  background-color: var(--accent-color);
  color: var(--accent-text);
}
.btn-primary:hover {
  background-color: #dddddd;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(255,255,255,0.2);
}

.btn-outline {
  background-color: transparent;
  color: var(--accent-color);
  border: 1px solid var(--accent-color);
}
.btn-outline:hover {
  background-color: var(--accent-color);
  color: var(--accent-text);
}

/* Forms */
.form-group {
  margin-bottom: var(--spacing-lg);
}
.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--text-muted);
}
.form-input {
  width: 100%;
  padding: 0.75rem 1rem;
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-main);
  font-size: 1rem;
  transition: border-color var(--transition-fast);
}
.form-input:focus {
  outline: none;
  border-color: var(--accent-color);
}

/* Hero Section */
.hero {
  text-align: center;
  padding: 6rem 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.hero h1 {
  font-size: 4rem;
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: var(--spacing-md);
  letter-spacing: -2px;
}
.hero p {
  font-size: 1.25rem;
  color: var(--text-muted);
  max-width: 600px;
  margin-bottom: var(--spacing-xl);
}
.hero-cta {
  display: flex;
  gap: var(--spacing-md);
}

/* Campaigns Grid */
.campaign-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

/* Campaign Card */
.campaign-card {
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}
.campaign-card:hover {
  border-color: var(--accent-color);
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(255,255,255,0.05);
}
.campaign-card .platform-badge {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background-color: #222;
  color: #fff;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
}
.campaign-card h3 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
  margin-top: 1rem;
}
.campaign-card p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
  flex: 1;
}
.campaign-card .reward {
  font-weight: 700;
  color: var(--success);
  margin-bottom: 1rem;
  font-size: 1.1rem;
}

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

/* Dashboard */
.dashboard-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
}
.stat-card {
  background-color: var(--surface-color);
  padding: var(--spacing-lg);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  text-align: center;
}
.stat-card h4 {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}
.stat-card .value {
  font-size: 2.5rem;
  font-weight: 800;
}

/* Auth Container */
.auth-container {
  max-width: 400px;
  margin: 4rem auto;
  background-color: var(--surface-color);
  padding: 3rem 2rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  text-align: center;
}
.auth-container h2 {
  font-size: 2rem;
  margin-bottom: 2rem;
  font-weight: 800;
}

/* Social Login Extensions */
.divider {
  display: flex;
  align-items: center;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-bottom: 2rem;
}
.divider::before, .divider::after {
  content: '';
  flex: 1;
  border-bottom: 1px solid var(--border-color);
}
.divider span {
  padding: 0 1rem;
}

.social-login-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.social-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
}

.btn-google { background-color: #ffffff; color: #3c4043; }
.btn-google:hover { background-color: #f8f9fa; transform: translateY(-2px); box-shadow: 0 4px 12px rgba(255,255,255,0.1); }

.btn-apple { background-color: #000000; color: #ffffff; border-color: #333333; }
.btn-apple:hover { background-color: #111111; transform: translateY(-2px); box-shadow: 0 4px 12px rgba(255,255,255,0.1); border-color: #555; }

.btn-naver { background-color: #03c75a; color: #ffffff; }
.btn-naver:hover { background-color: #02ad4e; transform: translateY(-2px); box-shadow: 0 4px 12px rgba(3,199,90,0.3); }

.btn-kakao { background-color: #fee500; color: #000000; }
.btn-kakao:hover { background-color: #e6ce00; transform: translateY(-2px); box-shadow: 0 4px 12px rgba(254,229,0,0.3); }