/* Core CSS - 기본 스타일 */
:root {
    /* 다크 테마 색상 */
    --bg-primary: #0b0e11;
    --bg-secondary: #161a1e;
    --bg-tertiary: #1e2329;
    --bg-hover: #2b3139;
    
    /* 텍스트 색상 */
    --text-primary: #eaecef;
    --text-secondary: #848e9c;
    --text-tertiary: #707a8a;
    --text-muted: #5e6673;
    
    /* 브랜드 색상 */
    --color-brand: #f0b90b;
    --primary-color: #f0b90b;
    --yellow: #fcd535;
    --green: #0ecb81;
    --red: #f6465d;
    
    /* 테두리 색상 */
    --border-color: #2b3139;
    --border-light: #363c45;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* 기본 링크 스타일 */
a {
    color: inherit;
    text-decoration: none;
}

/* 버튼 기본 스타일 */
button {
    font-family: inherit;
    cursor: pointer;
    outline: none;
    border: none;
    background: none;
}

/* 입력 필드 기본 스타일 */
input, select, textarea {
    font-family: inherit;
    outline: none;
    border: none;
}

/* 헤더 스타일 */
.header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    height: 64px;
    display: flex;
    align-items: center;
    padding: 0 24px;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 40px;
    flex: 1;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 20px;
}

/* 로고 스타일 */
.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}

.logo svg {
    width: 24px;
    height: 24px;
}

/* 네비게이션 메뉴 */
.nav-menu {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-item {
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    transition: color 0.2s;
}

.nav-item:hover,
.nav-item.active {
    color: var(--color-brand);
}

/* 사용자 메뉴 */
.user-menu {
    position: relative;
}

.user-menu-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: var(--bg-tertiary);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 14px;
    font-weight: 500;
    transition: background 0.2s;
}

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

.user-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    min-width: 200px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.3);
    display: none;
}

.user-menu.active .user-dropdown {
    display: block;
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    color: var(--text-secondary);
    font-size: 14px;
    transition: all 0.2s;
}

.dropdown-item:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.dropdown-item.active {
    color: var(--color-brand);
}

.dropdown-divider {
    margin: 4px 0;
    border: none;
    border-top: 1px solid var(--border-color);
}

/* 버튼 스타일 */
.btn {
    padding: 10px 20px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn-primary {
    background: var(--color-brand);
    color: var(--bg-primary);
}

.btn-primary:hover {
    background: var(--yellow);
    transform: translateY(-1px);
}

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

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

.btn-danger {
    background: var(--red);
    color: white;
}

.btn-danger:hover {
    background: #ff5a70;
    transform: translateY(-1px);
}

/* 폼 스타일 */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.form-input {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 14px;
    transition: border-color 0.2s;
}

.form-input:focus {
    border-color: var(--color-brand);
}

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

.form-helper {
    font-size: 12px;
    color: var(--text-tertiary);
    margin-top: 6px;
}

/* 카드 스타일 */
.card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px;
}

.card-header {
    margin-bottom: 20px;
}

.card-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

/* 반응형 유틸리티 */
.mobile-only {
    display: none !important;
}

@media (max-width: 768px) {
    .mobile-only {
        display: block !important;
    }
    
    .desktop-only {
        display: none !important;
    }
}

/* 스크롤바 스타일 */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-light);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}