/**
 * FPV DRONE - 메인 스타일시트
 * 다크 테마 + 사이버펑크/하이테크 느낌
 */

/* ===== Google Fonts ===== */
@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;500;600;700;800;900&family=Inter:wght@300;400;500;600;700&family=Noto+Sans+KR:wght@300;400;500;600;700&display=swap');

/* ===== CSS Variables ===== */
:root {
  /* 컬러 팔레트 */
  --color-bg-primary: #0a0e17;
  --color-bg-secondary: #111827;
  --color-bg-card: #1a2234;
  --color-bg-hover: #243047;
  
  --color-text-primary: #f8fafc;
  --color-text-secondary: #94a3b8;
  --color-text-muted: #64748b;
  
  /* 액센트 컬러 - 네온 느낌 */
  --color-accent-cyan: #00d4ff;
  --color-accent-blue: #3b82f6;
  --color-accent-purple: #8b5cf6;
  --color-accent-pink: #ec4899;
  --color-accent-amber: #f59e0b;
  --color-accent-green: #10b981;
  --color-accent-red: #ef4444;
  
  /* 그라디언트 */
  --gradient-primary: linear-gradient(135deg, var(--color-accent-cyan), var(--color-accent-blue));
  --gradient-hero: linear-gradient(135deg, #0a0e17 0%, #1e3a5f 50%, #0a0e17 100%);
  --gradient-card: linear-gradient(180deg, rgba(26,34,52,1) 0%, rgba(17,24,39,1) 100%);
  
  /* 글로우 효과 */
  --glow-cyan: 0 0 20px rgba(0, 212, 255, 0.3);
  --glow-blue: 0 0 20px rgba(59, 130, 246, 0.3);
  
  /* 폰트 */
  --font-display: 'Orbitron', sans-serif;
  --font-body: 'Noto Sans KR', 'Inter', sans-serif;
  
  /* 간격 */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  
  /* 반경 */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;
  
  /* 트랜지션 */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;
  
  /* 컨테이너 */
  --container-max: 1280px;
  --container-padding: 1rem;
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  min-height: 100vh;
}

/* 배경 그리드 패턴 */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    linear-gradient(rgba(0, 212, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 212, 255, 0.03) 1px, transparent 1px);
  background-size: 50px 50px;
  pointer-events: none;
  z-index: -1;
}

a {
  color: var(--color-accent-cyan);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-accent-blue);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
}

/* ===== Typography ===== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.025em;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

.text-gradient {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ===== Container ===== */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

/* ===== Navigation ===== */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 14, 23, 0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(0, 212, 255, 0.1);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.nav-logo-icon {
  width: 40px;
  height: 40px;
  background: var(--gradient-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 0.75rem;
  color: var(--color-bg-primary);
  box-shadow: var(--glow-cyan);
}

.nav-logo-text {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-text-primary);
  letter-spacing: 0.1em;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  list-style: none;
}

.nav-menu a {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--color-text-secondary);
  font-weight: 500;
  font-size: 0.875rem;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.nav-menu a:hover,
.nav-menu a.active {
  color: var(--color-text-primary);
  background: var(--color-bg-hover);
}

.nav-menu a.active {
  color: var(--color-accent-cyan);
  background: rgba(0, 212, 255, 0.1);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.nav-icon-btn {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  position: relative;
}

.nav-icon-btn:hover {
  color: var(--color-text-primary);
  background: var(--color-bg-hover);
}

.nav-icon-btn .badge {
  position: absolute;
  top: 6px;
  right: 6px;
  width: 8px;
  height: 8px;
  background: var(--color-accent-red);
  border-radius: var(--radius-full);
}

.nav-mobile-toggle {
  display: none;
}

/* Mobile Navigation */
@media (max-width: 1023px) {
  .nav-menu {
    display: none;
  }
  
  .nav-mobile-toggle {
    display: flex;
  }
  
  .nav-menu.mobile-open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--color-bg-secondary);
    border-bottom: 1px solid rgba(0, 212, 255, 0.1);
    padding: var(--spacing-md);
  }
  
  .nav-menu.mobile-open a {
    width: 100%;
    padding: var(--spacing-md);
  }
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-lg);
  font-weight: 600;
  font-size: 0.875rem;
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-primary);
  color: var(--color-bg-primary);
  box-shadow: var(--glow-cyan);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px rgba(0, 212, 255, 0.5);
}

.btn-secondary {
  background: transparent;
  color: var(--color-text-primary);
  border: 1px solid var(--color-text-muted);
}

.btn-secondary:hover {
  border-color: var(--color-accent-cyan);
  color: var(--color-accent-cyan);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-secondary);
}

.btn-ghost:hover {
  color: var(--color-text-primary);
  background: var(--color-bg-hover);
}

.btn-lg {
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: 1rem;
}

/* ===== Cards ===== */
.card {
  background: var(--gradient-card);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-base);
}

.card:hover {
  border-color: rgba(0, 212, 255, 0.2);
  transform: translateY(-4px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.card-image {
  aspect-ratio: 16 / 9;
  background: var(--color-bg-secondary);
  position: relative;
  overflow: hidden;
}

.card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.card:hover .card-image img {
  transform: scale(1.05);
}

.card-image-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--color-bg-secondary), var(--color-bg-hover));
  color: var(--color-text-muted);
}

.card-body {
  padding: var(--spacing-lg);
}

.card-category {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-accent-cyan);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-xs);
}

.card-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-excerpt {
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: var(--spacing-md);
}

.card-meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.card-meta-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

/* ===== Hero Section ===== */
.hero {
  background: var(--gradient-hero);
  padding: var(--spacing-2xl) 0;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%2300d4ff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  pointer-events: none;
}

.hero-content {
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.hero-title {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xl);
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

@media (max-width: 767px) {
  .hero-title {
    font-size: 2rem;
  }
  
  .hero-subtitle {
    font-size: 1rem;
  }
}

/* ===== Section ===== */
.section {
  padding: var(--spacing-2xl) 0;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-xl);
}

.section-title {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 1.5rem;
}

.section-title-icon {
  color: var(--color-accent-cyan);
}

.section-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  color: var(--color-accent-cyan);
  font-weight: 500;
  font-size: 0.875rem;
}

.section-link:hover {
  color: var(--color-text-primary);
}

/* ===== Grid ===== */
.grid {
  display: grid;
  gap: var(--spacing-lg);
}

.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 1023px) {
  .grid-cols-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-cols-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 639px) {
  .grid-cols-4,
  .grid-cols-3,
  .grid-cols-2 { grid-template-columns: 1fr; }
}

/* ===== Expert Card ===== */
.expert-card {
  background: var(--gradient-card);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  text-align: center;
  transition: all var(--transition-base);
}

.expert-card:hover {
  border-color: rgba(139, 92, 246, 0.3);
  box-shadow: 0 0 30px rgba(139, 92, 246, 0.1);
}

.expert-avatar {
  width: 80px;
  height: 80px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--color-accent-purple), var(--color-accent-pink));
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--spacing-md);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.5rem;
  color: white;
}

.expert-name {
  font-size: 1.125rem;
  margin-bottom: var(--spacing-xs);
}

.expert-field {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-sm);
  background: rgba(139, 92, 246, 0.2);
  color: var(--color-accent-purple);
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  margin-bottom: var(--spacing-sm);
}

.expert-org {
  color: var(--color-text-muted);
  font-size: 0.875rem;
  margin-bottom: var(--spacing-md);
}

.expert-stats {
  display: flex;
  justify-content: center;
  gap: var(--spacing-lg);
  padding-top: var(--spacing-md);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.expert-stat {
  text-align: center;
}

.expert-stat-value {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--color-accent-cyan);
}

.expert-stat-label {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

/* ===== Ranking Table ===== */
.ranking-table {
  width: 100%;
  border-collapse: collapse;
}

.ranking-table th,
.ranking-table td {
  padding: var(--spacing-md);
  text-align: left;
}

.ranking-table th {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.ranking-table tr {
  transition: background var(--transition-fast);
}

.ranking-table tbody tr:hover {
  background: var(--color-bg-hover);
}

.ranking-table td {
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.rank-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.875rem;
}

.rank-1 { background: linear-gradient(135deg, #ffd700, #ffb800); color: #000; }
.rank-2 { background: linear-gradient(135deg, #c0c0c0, #a0a0a0); color: #000; }
.rank-3 { background: linear-gradient(135deg, #cd7f32, #b87333); color: #fff; }
.rank-default { background: var(--color-bg-hover); color: var(--color-text-secondary); }

.player-info {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.player-avatar {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: var(--color-bg-primary);
}

.player-name {
  font-weight: 600;
}

.player-team {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.points-badge {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--color-accent-cyan);
}

/* ===== Competition Card ===== */
.comp-card {
  background: var(--gradient-card);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  transition: all var(--transition-base);
}

.comp-card:hover {
  border-color: rgba(245, 158, 11, 0.3);
  box-shadow: 0 0 30px rgba(245, 158, 11, 0.1);
}

.comp-badges {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.comp-badge {
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
}

.comp-badge-org {
  background: rgba(245, 158, 11, 0.2);
  color: var(--color-accent-amber);
}

.comp-badge-status {
  background: rgba(16, 185, 129, 0.2);
  color: var(--color-accent-green);
}

.comp-badge-status.upcoming {
  background: rgba(59, 130, 246, 0.2);
  color: var(--color-accent-blue);
}

.comp-badge-status.completed {
  background: rgba(100, 116, 139, 0.2);
  color: var(--color-text-muted);
}

.comp-title {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-md);
}

.comp-info {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  color: var(--color-text-secondary);
  font-size: 0.875rem;
}

.comp-info-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.comp-info-item svg {
  color: var(--color-text-muted);
}

/* ===== Footer ===== */
.footer {
  background: var(--color-bg-secondary);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding: var(--spacing-2xl) 0 var(--spacing-lg);
  margin-top: var(--spacing-2xl);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.footer-brand {
  max-width: 300px;
}

.footer-brand-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.footer-brand-text {
  color: var(--color-text-secondary);
  font-size: 0.875rem;
}

.footer-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: var(--spacing-sm);
}

.footer-links a {
  color: var(--color-text-secondary);
  font-size: 0.875rem;
}

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

.footer-bottom {
  padding-top: var(--spacing-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.footer-social {
  display: flex;
  gap: var(--spacing-md);
}

.footer-social a {
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

.footer-social a:hover {
  color: var(--color-accent-cyan);
}

@media (max-width: 767px) {
  .footer-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .footer-brand {
    max-width: none;
  }
  
  .footer-bottom {
    flex-direction: column;
    gap: var(--spacing-md);
  }
}

/* ===== Forms ===== */
.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
}

.form-input {
  width: 100%;
  padding: var(--spacing-md);
  background: var(--color-bg-secondary);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  transition: all var(--transition-fast);
}

.form-input:focus {
  outline: none;
  border-color: var(--color-accent-cyan);
  box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.1);
}

.form-input::placeholder {
  color: var(--color-text-muted);
}

/* ===== Newsletter ===== */
.newsletter {
  background: var(--gradient-card);
  border: 1px solid rgba(0, 212, 255, 0.2);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  text-align: center;
}

.newsletter-title {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-sm);
}

.newsletter-text {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-lg);
}

.newsletter-form {
  display: flex;
  gap: var(--spacing-sm);
  max-width: 500px;
  margin: 0 auto;
}

.newsletter-form .form-input {
  flex: 1;
}

@media (max-width: 639px) {
  .newsletter-form {
    flex-direction: column;
  }
}

/* ===== Utilities ===== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

.hidden { display: none; }

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

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

@keyframes glow {
  0%, 100% { box-shadow: var(--glow-cyan); }
  50% { box-shadow: 0 0 30px rgba(0, 212, 255, 0.5); }
}

.animate-fadeIn {
  animation: fadeIn 0.5s ease forwards;
}

.animate-pulse {
  animation: pulse 2s infinite;
}

.animate-glow {
  animation: glow 2s infinite;
}

/* Staggered animations */
.stagger-1 { animation-delay: 0.1s; }
.stagger-2 { animation-delay: 0.2s; }
.stagger-3 { animation-delay: 0.3s; }
.stagger-4 { animation-delay: 0.4s; }
.stagger-5 { animation-delay: 0.5s; }

/* ===== Page Header ===== */
.page-header {
  padding: var(--spacing-2xl) 0 var(--spacing-xl);
  text-align: center;
  background: linear-gradient(180deg, rgba(0, 212, 255, 0.05) 0%, transparent 100%);
}

.page-title {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.page-subtitle {
  color: var(--color-text-secondary);
  font-size: 1.125rem;
  max-width: 600px;
  margin: 0 auto;
}

/* ===== Filter Bar ===== */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  padding: 1.25rem;
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-xl);
}

.filter-group {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.filter-label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  white-space: nowrap;
}

.filter-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.filter-btn {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  background: var(--color-bg-secondary);
  border: 1px solid transparent;
  border-radius: var(--radius-full);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.filter-btn:hover {
  color: var(--color-text-primary);
  background: var(--color-bg-hover);
}

.filter-btn.active {
  color: var(--color-accent-cyan);
  background: rgba(0, 212, 255, 0.1);
  border-color: var(--color-accent-cyan);
}

/* ===== Column List ===== */
.column-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.column-card {
  display: flex;
  gap: 1.25rem;
  padding: 1.5rem;
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.05);
  transition: all var(--transition-base);
}

.column-card:hover {
  border-color: rgba(139, 92, 246, 0.3);
  transform: translateX(4px);
}

.column-avatar {
  flex-shrink: 0;
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-lg);
  font-size: 1.5rem;
  font-weight: 700;
  color: white;
}

.column-card-body {
  flex: 1;
  min-width: 0;
}

.column-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

.column-field {
  padding: 0.25rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-accent-purple);
  background: rgba(139, 92, 246, 0.15);
  border-radius: var(--radius-full);
}

.column-date {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.column-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  line-height: 1.4;
}

.column-title a {
  color: var(--color-text-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.column-title a:hover {
  color: var(--color-accent-purple);
}

.column-excerpt {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-bottom: 0.75rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.column-author {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
}

.column-author-name {
  font-weight: 500;
  color: var(--color-text-primary);
}

.column-author-title {
  color: var(--color-text-muted);
}

.column-card-stats {
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.75rem;
  padding-left: 1.5rem;
  border-left: 1px solid rgba(255, 255, 255, 0.05);
}

.column-stat {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

/* ===== CTA Box ===== */
.cta-box {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  padding: 2rem 2.5rem;
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.1) 0%, rgba(236, 72, 153, 0.1) 100%);
  border: 1px solid rgba(139, 92, 246, 0.2);
  border-radius: var(--radius-xl);
}

.cta-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.cta-text {
  color: var(--color-text-secondary);
}

/* ===== Competition List ===== */
.comp-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.comp-card-full {
  padding: 1.5rem;
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.05);
  transition: all var(--transition-base);
}

.comp-card-full:hover {
  border-color: rgba(245, 158, 11, 0.3);
}

.comp-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.comp-card-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.comp-card-title a {
  color: var(--color-text-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.comp-card-title a:hover {
  color: var(--color-accent-amber);
}

.comp-card-desc {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
}

.comp-card-info {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.comp-info-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.comp-info-item.prize {
  color: var(--color-accent-amber);
  font-weight: 500;
}

.comp-badge-tier {
  background: rgba(59, 130, 246, 0.15);
  color: var(--color-accent-blue);
}

.comp-badge-status.upcoming {
  background: rgba(16, 185, 129, 0.15);
  color: var(--color-accent-green);
}

.comp-badge-status.ongoing {
  background: rgba(245, 158, 11, 0.15);
  color: var(--color-accent-amber);
}

.comp-badge-status.completed {
  background: rgba(100, 116, 139, 0.15);
  color: var(--color-text-muted);
}

/* ===== Education Page ===== */
.edu-banner {
  display: flex;
  align-items: center;
  gap: 3rem;
  padding: 2.5rem;
  background: linear-gradient(135deg, var(--color-bg-card) 0%, rgba(139, 92, 246, 0.1) 100%);
  border: 1px solid rgba(139, 92, 246, 0.2);
  border-radius: var(--radius-xl);
  margin-bottom: var(--spacing-xl);
}

.edu-banner-content {
  flex: 1;
}

.edu-banner-badge {
  display: inline-block;
  padding: 0.375rem 0.875rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-accent-amber);
  background: rgba(245, 158, 11, 0.15);
  border-radius: var(--radius-full);
  margin-bottom: 1rem;
}

.edu-banner-title {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.edu-banner-text {
  color: var(--color-text-secondary);
  margin-bottom: 1.5rem;
}

.edu-banner-image {
  flex-shrink: 0;
}

.book-placeholder {
  width: 180px;
  height: 240px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.25rem;
  background: linear-gradient(135deg, var(--color-accent-cyan), var(--color-accent-blue));
  border-radius: var(--radius-md);
  box-shadow: 10px 10px 30px rgba(0, 0, 0, 0.3);
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: white;
}

/* Course Card */
.course-card {
  position: relative;
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.05);
  overflow: hidden;
  transition: all var(--transition-base);
}

.course-card:hover {
  border-color: rgba(0, 212, 255, 0.3);
  transform: translateY(-4px);
}

.course-card.featured {
  border-color: rgba(245, 158, 11, 0.3);
}

.course-featured-badge {
  position: absolute;
  top: 1rem;
  right: 1rem;
  padding: 0.25rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-bg-primary);
  background: var(--color-accent-amber);
  border-radius: var(--radius-full);
  z-index: 1;
}

.course-thumbnail {
  position: relative;
  height: 160px;
  background: linear-gradient(135deg, var(--color-bg-secondary), var(--color-bg-hover));
}

.course-thumbnail-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
}

.course-badges {
  position: absolute;
  bottom: 0.75rem;
  left: 0.75rem;
  display: flex;
  gap: 0.5rem;
}

.course-level,
.course-type {
  padding: 0.25rem 0.625rem;
  font-size: 0.75rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
}

.course-level {
  color: white;
}

.course-level.beginner { background: var(--color-accent-green); }
.course-level.intermediate { background: var(--color-accent-blue); }
.course-level.advanced { background: var(--color-accent-purple); }

.course-type {
  background: rgba(255, 255, 255, 0.1);
  color: var(--color-text-primary);
}

.course-body {
  padding: 1.25rem;
}

.course-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.course-desc {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.course-instructor {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.course-instructor-avatar {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 600;
  color: white;
}

.course-instructor-name {
  font-size: 0.875rem;
  font-weight: 500;
}

.course-instructor-title {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.course-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1rem;
}

.course-meta-item {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
}

.course-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.course-rating {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  color: var(--color-accent-amber);
  font-size: 0.875rem;
  font-weight: 500;
}

.course-price {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-accent-cyan);
}

/* ===== Auth Pages ===== */
.auth-section {
  min-height: calc(100vh - 80px);
  display: flex;
  align-items: center;
  padding: var(--spacing-xl) 0;
}

.auth-container {
  display: flex;
  gap: 3rem;
  max-width: 1000px;
  margin: 0 auto;
}

.auth-box {
  flex: 1;
  max-width: 420px;
  padding: 2.5rem;
  background: var(--color-bg-card);
  border-radius: var(--radius-xl);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.auth-header {
  text-align: center;
  margin-bottom: 2rem;
}

.auth-logo {
  display: flex;
  justify-content: center;
  margin-bottom: 1.5rem;
}

.auth-title {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.auth-subtitle {
  color: var(--color-text-secondary);
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-primary);
}

.form-label .required {
  color: var(--color-accent-red);
}

.input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.input-icon {
  position: absolute;
  left: 1rem;
  color: var(--color-text-muted);
  pointer-events: none;
}

.form-input {
  width: 100%;
  padding: 0.875rem 1rem 0.875rem 2.75rem;
  font-size: 0.9375rem;
  color: var(--color-text-primary);
  background: var(--color-bg-secondary);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.form-input:focus {
  outline: none;
  border-color: var(--color-accent-cyan);
  box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.1);
}

.form-input::placeholder {
  color: var(--color-text-muted);
}

.password-toggle {
  position: absolute;
  right: 1rem;
  background: none;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  padding: 0;
  display: flex;
  align-items: center;
  transition: color var(--transition-fast);
}

.password-toggle:hover {
  color: var(--color-text-primary);
}

.form-hint {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.form-options {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
  display: none;
}

.checkbox-custom {
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255, 255, 255, 0.2);
  border-radius: 4px;
  transition: all var(--transition-fast);
  position: relative;
}

.checkbox-label input[type="checkbox"]:checked + .checkbox-custom {
  background: var(--color-accent-cyan);
  border-color: var(--color-accent-cyan);
}

.checkbox-label input[type="checkbox"]:checked + .checkbox-custom::after {
  content: '';
  position: absolute;
  left: 5px;
  top: 2px;
  width: 5px;
  height: 9px;
  border: solid white;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

.form-link {
  font-size: 0.875rem;
  color: var(--color-accent-cyan);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.form-link:hover {
  color: var(--color-accent-blue);
  text-decoration: underline;
}

.btn-full {
  width: 100%;
}

.password-strength {
  display: none;
  align-items: center;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

.strength-bar {
  flex: 1;
  height: 4px;
  background: var(--color-bg-hover);
  border-radius: 2px;
  transition: width var(--transition-fast);
}

.strength-text {
  font-size: 0.75rem;
  font-weight: 500;
}

.user-type-selector {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.type-option input {
  display: none;
}

.type-card {
  padding: 1rem;
  background: var(--color-bg-secondary);
  border: 2px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.type-option input:checked + .type-card {
  border-color: var(--color-accent-cyan);
  background: rgba(0, 212, 255, 0.05);
}

.type-card svg {
  margin-bottom: 0.5rem;
  color: var(--color-text-muted);
}

.type-option input:checked + .type-card svg {
  color: var(--color-accent-cyan);
}

.type-name {
  display: block;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.type-desc {
  display: block;
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.checkbox-label.agreement {
  align-items: flex-start;
}

.checkbox-label.agreement .checkbox-custom {
  margin-top: 2px;
}

.auth-divider {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin: 1.5rem 0;
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

.auth-divider::before,
.auth-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: rgba(255, 255, 255, 0.1);
}

.social-login {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.btn-social {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 0.875rem;
  font-size: 0.9375rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: var(--color-bg-secondary);
  color: var(--color-text-primary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

.btn-google:hover { border-color: #4285F4; }
.btn-kakao { background: #FEE500; color: #000; border-color: #FEE500; }
.btn-kakao:hover { background: #F5DC00; }
.btn-naver { background: #03C75A; border-color: #03C75A; }
.btn-naver:hover { background: #02b351; }

.auth-footer {
  text-align: center;
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  color: var(--color-text-secondary);
}

.auth-side {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 3rem;
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.05) 0%, rgba(59, 130, 246, 0.05) 100%);
  border-radius: var(--radius-xl);
}

.auth-side-content {
  max-width: 320px;
}

.auth-side-title {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 2rem;
}

.auth-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.auth-features li {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1rem;
  color: var(--color-text-secondary);
}

/* ===== Pagination ===== */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  margin-top: var(--spacing-xl);
}

.pagination-btn {
  min-width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 0.75rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  background: var(--color-bg-card);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.pagination-btn:hover:not(:disabled) {
  color: var(--color-text-primary);
  background: var(--color-bg-hover);
}

.pagination-btn.active {
  color: var(--color-accent-cyan);
  border-color: var(--color-accent-cyan);
  background: rgba(0, 212, 255, 0.1);
}

.pagination-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* ===== Responsive: Auth Pages ===== */
@media (max-width: 768px) {
  .auth-container {
    flex-direction: column;
  }
  
  .auth-side {
    display: none;
  }
  
  .auth-box {
    max-width: 100%;
  }
  
  .user-type-selector {
    grid-template-columns: 1fr;
  }
  
  .edu-banner {
    flex-direction: column;
    text-align: center;
  }
  
  .cta-box {
    flex-direction: column;
    text-align: center;
  }
  
  .column-card {
    flex-direction: column;
  }
  
  .column-card-stats {
    flex-direction: row;
    padding-left: 0;
    padding-top: 1rem;
    border-left: none;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
  }
  
  .filter-bar {
    flex-direction: column;
  }
}