/* 다크 테마 메인 스타일 */
:root {
    /* 컬러 팔레트 */
    --bg-primary: #0c0c0c;
    --bg-secondary: #121212;
    --bg-card: #1a1a1a;
    --accent-primary: #ffb100;
    --accent-secondary: #ff8c00;
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --text-tertiary: #707070;
    --border-color: #333333;
    
    /* 그림자 */
    --shadow-soft: 0 8px 16px rgba(0, 0, 0, 0.4);
    --shadow-neon: 0 0 15px rgba(255, 177, 0, 0.3);
    
    /* 테두리 */
    --border-radius: 8px;
    
    /* 애니메이션 */
    --transition-speed: 0.3s;
  }
  
  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  body, html {
    height: 100%;
    font-family: 'Noto Sans KR', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    overflow-x: hidden;
  }
  
  .container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
  }
  
  a {
    text-decoration: none;
    color: var(--text-secondary);
    transition: color var(--transition-speed);
  }
  
  a:hover {
    color: var(--accent-primary);
  }
  
  button {
    cursor: pointer;
  }
  
  .hidden {
    display: none !important;
  }
  
  /* 네비게이션 바 */
  header {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
  }
  
  .navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
  }
  
  .logo h1 {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--accent-primary);
    letter-spacing: 1px;
  }
  
  .nav-links ul {
    display: flex;
    list-style: none;
    gap: 2rem;
  }
  
  .nav-links a {
    font-weight: 500;
    position: relative;
    padding: 0.5rem 0;
  }
  
  .nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--accent-primary);
    transition: width var(--transition-speed);
  }
  
  .nav-links a:hover::after,
  .nav-links a.active::after {
    width: 100%;
  }
  
  .auth-buttons {
    display: flex;
    gap: 1rem;
  }
  
  .btn {
    padding: 0.6rem 1.5rem;
    border-radius: var(--border-radius);
    font-weight: 500;
    transition: all var(--transition-speed);
    border: none;
    font-size: 0.9rem;
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
  }
  
  .btn:hover {
    background-color: rgba(255, 177, 0, 0.1);
    color: var(--accent-primary);
  }
  
  .btn-primary {
    background-color: var(--accent-primary);
    color: #000;
    border: none;
  }
  
  .btn-primary:hover {
    background-color: var(--accent-secondary);
    color: #000;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(255, 177, 0, 0.3);
  }
  
  /* 사용자 프로필 */
  .user-profile {
    display: flex;
    align-items: center;
    gap: 0.8rem;
  }
  
  .user-profile img {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--accent-primary);
  }
  
  #username-display {
    color: var(--text-primary);
    font-weight: 500;
  }
  
  .dropdown {
    position: relative;
  }
  
  .dropdown-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 0.2rem 0.5rem;
    transition: all var(--transition-speed);
  }
  
  .dropdown-btn:hover {
    color: var(--accent-primary);
  }
  
  .dropdown-content {
    position: absolute;
    right: 0;
    top: 150%;
    background-color: var(--bg-card);
    min-width: 160px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-soft);
    z-index: 10;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all var(--transition-speed);
    border: 1px solid var(--border-color);
  }
  
  .dropdown-content.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }
  
  .dropdown-content a {
    display: block;
    padding: 0.8rem 1rem;
    color: var(--text-secondary);
    transition: all var(--transition-speed);
  }
  
  .dropdown-content a:hover {
    background-color: rgba(255, 177, 0, 0.1);
    color: var(--accent-primary);
  }
  
  /* 햄버거 메뉴 */
  .hamburger {
    display: none;
    flex-direction: column;
    gap: 6px;
    cursor: pointer;
  }
  
  .hamburger span {
    display: block;
    width: 25px;
    height: 2px;
    background-color: var(--text-secondary);
    transition: all var(--transition-speed);
  }
  
  .hamburger.active span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
  }
  
  .hamburger.active span:nth-child(2) {
    opacity: 0;
  }
  
  .hamburger.active span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
  }
  
  /* 메인 콘텐츠 */
  main {
    flex: 1;
    display: flex;
    flex-direction: column;
    position: relative;
    z-index: 1;
  }
  
  /* 히어로 섹션 */
  .hero {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 6rem 1rem 4rem;
    position: relative;
  }
  
  .hero h1 {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    background: linear-gradient(to right, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    animation: glow 3s infinite;
  }
  
  .hero p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin-bottom: 2rem;
    line-height: 1.6;
  }
  
  /* 특징 섹션 */
  .features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
  }
  
  .feature-card {
    max-width: 310px;
    background-color: var(--bg-card);
    border-radius: var(--border-radius);
    padding: 2.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
    border: 1px solid var(--border-color);
  }
  
  .feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-soft), var(--shadow-neon);
  }
  
  .feature-icon {
    width: 70px;
    height: 70px;
    border-radius: 50%;
    background-color: rgba(255, 177, 0, 0.1);
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 1.5rem;
  }
  
  .feature-icon i {
    font-size: 2rem;
    color: var(--accent-primary);
  }
  
  .feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
  }
  
  .feature-card p {
    color: var(--text-secondary);
    line-height: 1.6;
  }
  
  /* 푸터 */
  footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 3rem 2rem;
    margin-top: 4rem;
  }
  
  .footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
  }
  
  .footer-logo h2 {
    font-size: 1.5rem;
    color: var(--accent-primary);
  }
  
  .footer-links {
    display: flex;
    gap: 2rem;
  }
  
  .footer-links a {
    color: var(--text-secondary);
    font-size: 0.9rem;
  }
  
  .footer-copyright {
    color: var(--text-tertiary);
    font-size: 0.85rem;
    text-align: center;
  }

  .logo-link {
    text-decoration: none; /* 밑줄 제거 */
    color: inherit; /* 기본 텍스트 색상 유지 */
    display: inline-block;
    transition: color var(--transition-speed);
  }
  
  .logo-link:hover {
    color: var(--accent-primary); /* 마우스 오버 시 황금색으로 변경 */
  }
  
  /* 애니메이션 */
  @keyframes glow {
    0% {
      text-shadow: 0 0 5px rgba(255, 177, 0, 0.5);
    }
    50% {
      text-shadow: 0 0 20px rgba(255, 177, 0, 0.8);
    }
    100% {
      text-shadow: 0 0 5px rgba(255, 177, 0, 0.5);
    }
  }
  
  /* 반응형 디자인 */
  @media (max-width: 768px) {
    .navbar {
      padding: 1rem;
    }
  
    .nav-links {
      display: none;
      position: absolute;
      top: 100%;
      left: 0;
      width: 100%;
      background-color: var(--bg-secondary);
      padding: 1rem;
      border-bottom: 1px solid var(--border-color);
    }
  
    .nav-links.active {
      display: block;
    }
  
    .nav-links ul {
      flex-direction: column;
      gap: 1rem;
    }
  
    .hamburger {
      display: flex;
    }
  
    .auth-buttons {
      display: none;
    }
  
    .auth-buttons.active {
      display: flex;
      flex-direction: column;
      width: 100%;
      padding: 1rem;
    }
  
    .hero h1 {
      font-size: 2.5rem;
    }
    
    .features {
      grid-template-columns: 1fr;
      padding: 1rem;
    }
    
    .footer-links {
      flex-wrap: wrap;
      justify-content: center;
      gap: 1rem;
    }
  }
  
  /* 다크 모드에서만 필요한 추가 스타일 */
  .feature-card:hover .feature-icon {
    background-color: rgba(255, 177, 0, 0.2);
  }
  
  .start-btn {
    margin-top: 1rem;
  }