/**
 * Modern UI CSS
 * LinkNavi 모던 UI 스타일시트
 */

:root {
    /* 기본 색상 */
    --primary-color: #ffd700;
    --secondary-color: #ffed4e;
    --dark-bg: #000000;
    --dark-bg-secondary: #1a1a1a;
    --dark-bg-tertiary: #2a2a2a;
    --text-primary: #ffffff;
    --text-secondary: #cccccc;
    --text-muted: #888888;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --info-color: #3b82f6;
    
    /* 그라데이션 */
    --gradient-primary: linear-gradient(135deg, #ffd700 0%, #ffed4e 100%);
    --gradient-dark: linear-gradient(135deg, #1a1a1a 0%, #2a2a2a 100%);
    --gradient-glow: radial-gradient(circle at center, rgba(255, 215, 0, 0.2) 0%, transparent 70%);
    
    /* 그림자 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.5);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(255, 215, 0, 0.3);
    
    /* 애니메이션 */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
    
    /* 간격 */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* 테두리 */
    --border-radius-sm: 0.25rem;
    --border-radius-md: 0.5rem;
    --border-radius-lg: 1rem;
    --border-radius-xl: 1.5rem;
    --border-radius-full: 9999px;
}

/* 다크모드 변수 */
[data-theme="dark"] {
    --primary-color: #ffd700;
    --dark-bg: #0a0a0a;
    --dark-bg-secondary: #141414;
    --dark-bg-tertiary: #1f1f1f;
}

/* ==================== 기본 스타일 ==================== */

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

body {
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--dark-bg);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ==================== 레이아웃 ==================== */

.container-fluid {
    padding: 0 var(--spacing-md);
}

@media (min-width: 768px) {
    .container-fluid {
        padding: 0 var(--spacing-xl);
    }
}

/* ==================== 타이포그래피 ==================== */

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

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

/* ==================== 버튼 ==================== */

.btn-modern {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--border-radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
    text-decoration: none;
}

.btn-modern:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-modern:active {
    transform: translateY(0);
}

.btn-primary-modern {
    background: var(--gradient-primary);
    color: var(--dark-bg);
}

.btn-primary-modern:hover {
    box-shadow: var(--shadow-glow);
}

.btn-outline-modern {
    background: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
}

.btn-outline-modern:hover {
    background: var(--primary-color);
    color: var(--dark-bg);
}

.btn-glass {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--text-primary);
}

.btn-glass:hover {
    background: rgba(255, 255, 255, 0.15);
}

/* 버튼 리플 효과 */
.btn-modern::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.5);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn-modern:active::before {
    width: 300px;
    height: 300px;
}

/* ==================== 카드 ==================== */

.card-modern {
    background: var(--dark-bg-secondary);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    border: 1px solid rgba(255, 215, 0, 0.1);
    transition: all var(--transition-base);
}

.card-modern:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: rgba(255, 215, 0, 0.3);
}

.card-glass {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.card-glow {
    position: relative;
    overflow: hidden;
}

.card-glow::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: var(--gradient-glow);
    opacity: 0;
    transition: opacity var(--transition-base);
    pointer-events: none;
}

.card-glow:hover::before {
    opacity: 1;
}

/* ==================== 폼 요소 ==================== */

.form-modern {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.form-group-modern {
    position: relative;
}

.form-control-modern {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--dark-bg-tertiary);
    border: 2px solid transparent;
    border-radius: var(--border-radius-md);
    color: var(--text-primary);
    font-size: 1rem;
    transition: all var(--transition-base);
}

.form-control-modern:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(255, 215, 0, 0.1);
}

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

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

/* 플로팅 라벨 */
.form-floating-modern {
    position: relative;
}

.form-floating-modern input {
    padding-top: 1.5rem;
}

.form-floating-modern label {
    position: absolute;
    top: 50%;
    left: var(--spacing-md);
    transform: translateY(-50%);
    transition: all var(--transition-base);
    pointer-events: none;
}

.form-floating-modern input:focus ~ label,
.form-floating-modern input:not(:placeholder-shown) ~ label {
    top: 0.5rem;
    font-size: 0.75rem;
    color: var(--primary-color);
    transform: translateY(0);
}

/* ==================== 네비게이션 ==================== */

.navbar-modern {
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 215, 0, 0.1);
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-link-modern {
    color: var(--text-secondary);
    text-decoration: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-md);
    transition: all var(--transition-base);
    position: relative;
}

.nav-link-modern:hover {
    color: var(--primary-color);
    background: rgba(255, 215, 0, 0.1);
}

.nav-link-modern.active {
    color: var(--primary-color);
}

.nav-link-modern.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: var(--spacing-md);
    right: var(--spacing-md);
    height: 2px;
    background: var(--gradient-primary);
}

/* ==================== 배너 ==================== */

.banner-modern {
    position: relative;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    background: var(--dark-bg-secondary);
    transition: all var(--transition-base);
    cursor: pointer;
}

.banner-modern:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-glow);
}

.banner-modern img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.banner-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--spacing-md);
    background: linear-gradient(to top, rgba(0, 0, 0, 0.9), transparent);
    color: var(--text-primary);
    transform: translateY(100%);
    transition: transform var(--transition-base);
}

.banner-modern:hover .banner-overlay {
    transform: translateY(0);
}

.banner-premium {
    border: 2px solid var(--primary-color);
    position: relative;
}

.banner-premium::before {
    content: 'PREMIUM';
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    background: var(--gradient-primary);
    color: var(--dark-bg);
    padding: 2px 8px;
    border-radius: var(--border-radius-sm);
    font-size: 0.75rem;
    font-weight: 700;
    z-index: 1;
}

/* ==================== 게시판 ==================== */

.post-card-modern {
    background: var(--dark-bg-secondary);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    border: 1px solid transparent;
    transition: all var(--transition-base);
}

.post-card-modern:hover {
    border-color: rgba(255, 215, 0, 0.3);
    transform: translateX(4px);
}

.post-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.post-meta {
    display: flex;
    gap: var(--spacing-md);
    color: var(--text-muted);
    font-size: 0.875rem;
}

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

.comment-card {
    background: var(--dark-bg-tertiary);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    border-left: 3px solid var(--primary-color);
}

.comment-reply {
    margin-left: var(--spacing-xl);
}

/* ==================== 태그 ==================== */

.tag-modern {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: rgba(255, 215, 0, 0.1);
    color: var(--primary-color);
    border-radius: var(--border-radius-full);
    font-size: 0.875rem;
    text-decoration: none;
    transition: all var(--transition-base);
}

.tag-modern:hover {
    background: var(--primary-color);
    color: var(--dark-bg);
    transform: scale(1.05);
}

/* ==================== 페이지네이션 ==================== */

.pagination-modern {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    margin: var(--spacing-xl) 0;
}

.page-link-modern {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--dark-bg-secondary);
    color: var(--text-secondary);
    border-radius: var(--border-radius-md);
    text-decoration: none;
    transition: all var(--transition-base);
}

.page-link-modern:hover {
    background: var(--primary-color);
    color: var(--dark-bg);
}

.page-link-modern.active {
    background: var(--gradient-primary);
    color: var(--dark-bg);
    font-weight: 600;
}

/* ==================== 통계 카드 ==================== */

.stat-card {
    background: var(--gradient-dark);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: var(--gradient-glow);
    opacity: 0.5;
    animation: rotate 10s linear infinite;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-xs);
}

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

/* ==================== 로딩 애니메이션 ==================== */

.spinner-modern {
    width: 40px;
    height: 40px;
    border: 3px solid var(--dark-bg-tertiary);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.skeleton {
    background: linear-gradient(90deg, 
        var(--dark-bg-secondary) 25%, 
        var(--dark-bg-tertiary) 50%, 
        var(--dark-bg-secondary) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* ==================== 알림 ==================== */

.alert-modern {
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
    margin-bottom: var(--spacing-md);
    border-left: 4px solid;
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from {
        transform: translateX(-100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.alert-success {
    background: rgba(16, 185, 129, 0.1);
    border-color: var(--success-color);
    color: var(--success-color);
}

.alert-warning {
    background: rgba(245, 158, 11, 0.1);
    border-color: var(--warning-color);
    color: var(--warning-color);
}

.alert-danger {
    background: rgba(239, 68, 68, 0.1);
    border-color: var(--danger-color);
    color: var(--danger-color);
}

/* ==================== 모달 ==================== */

.modal-backdrop-modern {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(5px);
    z-index: 9998;
    animation: fadeIn 0.3s ease-out;
}

.modal-modern {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--dark-bg-secondary);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    max-width: 500px;
    width: 90%;
    z-index: 9999;
    animation: modalSlideIn 0.3s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes modalSlideIn {
    from {
        transform: translate(-50%, -50%) scale(0.9);
        opacity: 0;
    }
    to {
        transform: translate(-50%, -50%) scale(1);
        opacity: 1;
    }
}

/* ==================== 툴팁 ==================== */

.tooltip-modern {
    position: relative;
}

.tooltip-modern::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--dark-bg-tertiary);
    color: var(--text-primary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-sm);
    font-size: 0.875rem;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-base);
}

.tooltip-modern:hover::after {
    opacity: 1;
}

/* ==================== 반응형 ==================== */

@media (max-width: 768px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.5rem; }
    h3 { font-size: 1.25rem; }
    
    .container-fluid {
        padding: 0 var(--spacing-sm);
    }
    
    .card-modern {
        padding: var(--spacing-md);
    }
    
    .banner-grid {
        grid-template-columns: 1fr;
    }
    
    .stat-value {
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    .btn-modern {
        padding: var(--spacing-xs) var(--spacing-md);
        font-size: 0.875rem;
    }
    
    .pagination-modern {
        flex-wrap: wrap;
    }
}

/* ==================== 유틸리티 클래스 ==================== */

.text-gold { color: var(--primary-color); }
.bg-gold { background: var(--primary-color); }
.bg-dark-secondary { background: var(--dark-bg-secondary); }
.bg-dark-tertiary { background: var(--dark-bg-tertiary); }

.rounded-sm { border-radius: var(--border-radius-sm); }
.rounded-md { border-radius: var(--border-radius-md); }
.rounded-lg { border-radius: var(--border-radius-lg); }
.rounded-xl { border-radius: var(--border-radius-xl); }
.rounded-full { border-radius: var(--border-radius-full); }

.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }
.shadow-xl { box-shadow: var(--shadow-xl); }
.shadow-glow { box-shadow: var(--shadow-glow); }

.transition-fast { transition: all var(--transition-fast); }
.transition-base { transition: all var(--transition-base); }
.transition-slow { transition: all var(--transition-slow); }

.hover-scale:hover { transform: scale(1.05); }
.hover-rotate:hover { transform: rotate(3deg); }
.hover-glow:hover { box-shadow: var(--shadow-glow); }