/* ========================================
   Patent Index Page Enhanced Styles
   특허 목록 페이지 전용 향상된 스타일
   ======================================== */

/* ===== 기본 컨테이너 스타일 ===== */
.patent-page-container {
    background: var(--ip-gradient-mesh), var(--ip-bg-secondary);
    min-height: calc(100vh - 120px);
    padding: var(--ip-spacing-8) 0;
}

/* ===== 페이지 헤더 ===== */
.patent-page-header {
    background: var(--ip-gradient-primary);
    color: var(--ip-text-white);
    padding: var(--ip-spacing-8) 0;
    margin-bottom: var(--ip-spacing-8);
    border-radius: var(--ip-radius-xl);
    box-shadow: var(--ip-shadow-lg);
}

.patent-page-header h1 {
    font-size: var(--ip-text-4xl);
    font-weight: var(--ip-font-bold);
    margin: 0;
    text-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

/* ===== 검색 카드 스타일 ===== */
.patent-search-card {
    background: var(--ip-bg-card);
    margin-bottom: var(--ip-spacing-8);
    border: none;
    border-radius: var(--ip-radius-2xl);
    box-shadow: var(--ip-shadow-lg);
    backdrop-filter: blur(10px);
}

.patent-search-card .card-body {
    padding: var(--ip-spacing-8);
}

.patent-search-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--ip-shadow-xl);
}

/* ===== 검색 폼 스타일 ===== */
.search-form .form-label {
    font-weight: var(--ip-font-semibold);
    color: var(--ip-primary);
    margin-bottom: var(--ip-spacing-3);
    font-size: var(--ip-text-sm);
}

.search-form .form-control,
.search-form .form-select {
    border: 2px solid var(--ip-border);
    border-radius: var(--ip-radius-lg);
    padding: var(--ip-spacing-3) var(--ip-spacing-4);
    font-size: var(--ip-text-base);
    transition: var(--ip-transition-base);
    background: var(--ip-bg-primary);
}

.search-form .form-control:focus,
.search-form .form-select:focus {
    border-color: var(--ip-accent);
    box-shadow: 0 0 0 3px var(--ip-accent-glow);
    outline: none;
}

.search-form .form-control::placeholder {
    color: var(--ip-text-muted);
    opacity: 0.8;
}

/* ===== 특허 목록 카드 ===== */
.patent-list-card {
    border: none;
    border-radius: var(--ip-radius-2xl);
    box-shadow: var(--ip-shadow-lg);
    overflow: hidden;
    background: var(--ip-bg-card);
}

.patent-list-card .card-header {
    background: var(--ip-gradient-primary);
    color: var(--ip-text-white);
    border: none;
    padding: var(--ip-spacing-6) var(--ip-spacing-8);
    position: relative;
}

.patent-list-card .card-header::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
}

.patent-list-card .card-header h5 {
    margin: 0;
    font-weight: var(--ip-font-bold);
    font-size: var(--ip-text-xl);
    display: flex;
    align-items: center;
    gap: var(--ip-spacing-3);
}

.patent-list-card .card-header h5::before {
    content: '\F4A4';
    font-family: 'bootstrap-icons';
    font-size: var(--ip-text-lg);
    opacity: 0.8;
}

/* ===== 개별 특허 아이템 카드 ===== */
.patent-item-card {
    height: 100%;
    border: 1px solid var(--ip-border);
    border-radius: var(--ip-radius-xl);
    transition: var(--ip-transition-base);
    background: var(--ip-bg-primary);
    position: relative;
    overflow: hidden;
}

.patent-item-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--ip-accent);
    opacity: 0;
    transition: var(--ip-transition-base);
}

.patent-item-card:hover {
    border-color: var(--ip-accent);
    box-shadow: var(--ip-shadow-xl);
    transform: translateY(-3px) translateX(4px);
}

.patent-item-card:hover::before {
    opacity: 1;
}

.patent-item-card .card-body {
    padding: var(--ip-spacing-6);
    position: relative;
}

.patent-item-card .card-title {
    font-size: var(--ip-text-lg);
    font-weight: var(--ip-font-semibold);
    color: var(--ip-primary);
    margin-bottom: var(--ip-spacing-3);
    line-height: var(--ip-leading-tight);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.patent-item-card .card-title a {
    color: inherit;
    text-decoration: none;
    transition: var(--ip-transition-fast);
}

.patent-item-card .card-title a:hover {
    color: var(--ip-accent);
}

.patent-item-card .card-subtitle {
    font-size: var(--ip-text-sm);
    color: var(--ip-text-secondary);
    margin-bottom: var(--ip-spacing-3);
    font-weight: var(--ip-font-medium);
    display: flex;
    align-items: center;
    gap: var(--ip-spacing-2);
}

.patent-item-card .card-subtitle::before {
    content: '\F1AD';
    font-family: 'bootstrap-icons';
    color: var(--ip-accent);
    font-size: var(--ip-text-xs);
}

.patent-item-card .card-text {
    font-size: var(--ip-text-sm);
    color: var(--ip-text-secondary);
    line-height: var(--ip-leading-relaxed);
    margin-bottom: var(--ip-spacing-4);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.patent-item-card .card-footer {
    background: var(--ip-bg-tertiary);
    border-top: 1px solid var(--ip-border-light);
    padding: var(--ip-spacing-4) var(--ip-spacing-6);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* ===== 특허 메타 정보 ===== */
.patent-item-card .d-flex.justify-content-between {
    margin-bottom: var(--ip-spacing-3);
}

.patent-item-card .d-flex.justify-content-between:not(.card-footer) {
    align-items: flex-start;
    gap: var(--ip-spacing-4);
}

.patent-item-card .d-flex.justify-content-between > div:last-child {
    text-align: right;
    font-size: var(--ip-text-xs);
    color: var(--ip-text-muted);
    white-space: nowrap;
}

/* ===== 배지 스타일 ===== */
.patent-badge {
    font-size: var(--ip-text-xs);
    padding: var(--ip-spacing-1) var(--ip-spacing-3);
    border-radius: var(--ip-radius-full);
    font-weight: var(--ip-font-semibold);
    display: inline-flex;
    align-items: center;
    gap: var(--ip-spacing-1);
    margin-right: var(--ip-spacing-2);
    margin-bottom: var(--ip-spacing-1);
}

.badge-promising {
    background: linear-gradient(135deg, #ffc107, #ffb300);
    color: #000;
    box-shadow: 0 2px 4px rgba(255, 193, 7, 0.3);
}

.badge-trl {
    background: linear-gradient(135deg, #17a2b8, #138496);
    color: white;
    box-shadow: 0 2px 4px rgba(23, 162, 184, 0.3);
}

.badge-category {
    background: linear-gradient(135deg, #6c757d, #545b62);
    color: white;
    box-shadow: 0 2px 4px rgba(108, 117, 125, 0.3);
}

.badge-promising::before {
    content: '\F4A1';
    font-family: 'bootstrap-icons';
}

.badge-trl::before {
    content: '\F4E6';
    font-family: 'bootstrap-icons';
}

.badge-category::before {
    content: '\F4A4';
    font-family: 'bootstrap-icons';
}

/* ===== 찜하기 버튼 스타일 ===== */
.favorite-btn {
    transition: var(--ip-transition-base);
    border-radius: var(--ip-radius-lg);
    font-size: var(--ip-text-sm);
    font-weight: var(--ip-font-medium);
    position: relative;
    z-index: 2;
    padding: var(--ip-spacing-2) var(--ip-spacing-4);
    display: inline-flex;
    align-items: center;
    gap: var(--ip-spacing-2);
}

.favorite-btn:hover {
    transform: scale(1.05);
}

.favorite-btn.btn-danger {
    background: linear-gradient(135deg, #dc3545, #c82333);
    border-color: #dc3545;
    color: white;
    box-shadow: var(--ip-shadow-md);
}

.favorite-btn.btn-outline-danger {
    color: #dc3545;
    border-color: #dc3545;
    background: transparent;
}

.favorite-btn.btn-outline-danger:hover {
    background: linear-gradient(135deg, #dc3545, #c82333);
    border-color: #dc3545;
    color: white;
    box-shadow: var(--ip-shadow-md);
}

.favorite-btn i {
    font-size: var(--ip-text-sm);
}

/* ===== 페이지네이션 스타일 ===== */
.pagination {
    margin-top: var(--ip-spacing-8);
    justify-content: center;
    gap: var(--ip-spacing-2);
}

.page-item {
    margin: 0;
}

.page-link {
    color: var(--ip-primary);
    border: 2px solid var(--ip-border);
    padding: var(--ip-spacing-3) var(--ip-spacing-4);
    transition: var(--ip-transition-base);
    border-radius: var(--ip-radius-lg);
    font-weight: var(--ip-font-medium);
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 44px;
    text-decoration: none;
}

.page-link:hover {
    background: var(--ip-accent-glow);
    border-color: var(--ip-accent);
    color: var(--ip-accent);
    transform: translateY(-2px);
}

.page-item.active .page-link {
    background: var(--ip-gradient-primary);
    border-color: var(--ip-primary);
    color: white;
    box-shadow: var(--ip-shadow-md);
}

.page-item.disabled .page-link {
    color: var(--ip-text-muted);
    background: var(--ip-bg-tertiary);
    border-color: var(--ip-border-light);
    cursor: not-allowed;
}

.page-item.disabled .page-link:hover {
    transform: none;
}

/* ===== 토스트 메시지 스타일 ===== */
.toast-container {
    z-index: var(--ip-z-tooltip);
    position: fixed;
    top: var(--ip-spacing-4);
    right: var(--ip-spacing-4);
}

.toast {
    border-radius: var(--ip-radius-xl);
    backdrop-filter: blur(10px);
    border: none;
    box-shadow: var(--ip-shadow-xl);
    min-width: 300px;
}

.toast.bg-success {
    background: linear-gradient(135deg, rgba(40, 167, 69, 0.95), rgba(25, 135, 84, 0.95)) !important;
    color: white;
}

.toast.bg-danger {
    background: linear-gradient(135deg, rgba(220, 53, 69, 0.95), rgba(200, 35, 51, 0.95)) !important;
    color: white;
}

.toast .toast-body {
    padding: var(--ip-spacing-4);
    font-weight: var(--ip-font-medium);
    display: flex;
    align-items: center;
    gap: var(--ip-spacing-3);
}

.toast .toast-body::before {
    content: '\F4CC';
    font-family: 'bootstrap-icons';
    font-size: var(--ip-text-lg);
}

.toast.bg-danger .toast-body::before {
    content: '\F4D1';
}

/* ===== 알림 메시지 스타일 ===== */
.alert {
    padding: var(--ip-spacing-6);
    margin-bottom: var(--ip-spacing-6);
    border: none;
    border-radius: var(--ip-radius-xl);
    display: flex;
    align-items: center;
    gap: var(--ip-spacing-4);
    font-weight: var(--ip-font-medium);
    box-shadow: var(--ip-shadow-sm);
}

.alert-info {
    background: linear-gradient(135deg, #d1ecf1, #b8e2e8);
    color: #0c5460;
    border-left: 4px solid var(--ip-info);
}

.alert-info i {
    font-size: var(--ip-text-xl);
    color: var(--ip-info);
}

/* ===== 버튼 개선 스타일 ===== */
.btn {
    border-radius: var(--ip-radius-lg);
    font-weight: var(--ip-font-medium);
    transition: var(--ip-transition-base);
    padding: var(--ip-spacing-3) var(--ip-spacing-5);
    font-size: var(--ip-text-sm);
    display: inline-flex;
    align-items: center;
    gap: var(--ip-spacing-2);
    text-decoration: none;
    border: 2px solid transparent;
}

.btn i {
    font-size: var(--ip-text-sm);
}

.btn-primary {
    background: var(--ip-gradient-primary);
    border-color: var(--ip-primary);
    color: white;
    box-shadow: var(--ip-shadow-md);
}

.btn-primary:hover {
    background: var(--ip-gradient-accent);
    border-color: var(--ip-accent);
    transform: translateY(-2px);
    box-shadow: var(--ip-shadow-lg);
    color: white;
}

.btn-outline-primary {
    color: var(--ip-primary);
    border-color: var(--ip-primary);
    background: transparent;
}

.btn-outline-primary:hover {
    background: var(--ip-gradient-primary);
    border-color: var(--ip-primary);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--ip-shadow-lg);
}

.btn-outline-secondary {
    color: var(--ip-secondary);
    border-color: var(--ip-secondary);
    background: transparent;
}

.btn-outline-secondary:hover {
    background: var(--ip-secondary);
    border-color: var(--ip-secondary);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--ip-shadow-lg);
}

/* ===== 로딩 상태 ===== */
.loading {
    opacity: 0.7;
    pointer-events: none;
    position: relative;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 24px;
    height: 24px;
    margin: -12px 0 0 -12px;
    border: 3px solid var(--ip-border);
    border-radius: 50%;
    border-top-color: var(--ip-accent);
    animation: patent-spin 0.8s linear infinite;
    z-index: 1;
}

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

/* ===== 접근성 개선 ===== */
.skip-link {
    position: absolute;
    top: -50px;
    left: var(--ip-spacing-2);
    background: var(--ip-primary);
    color: white;
    padding: var(--ip-spacing-2) var(--ip-spacing-4);
    text-decoration: none;
    border-radius: var(--ip-radius-lg);
    z-index: var(--ip-z-tooltip);
    transition: var(--ip-transition-fast);
    font-weight: var(--ip-font-medium);
}

.skip-link:focus {
    top: var(--ip-spacing-2);
    outline: 2px solid var(--ip-accent);
    outline-offset: 2px;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ===== 반응형 디자인 ===== */
@media (max-width: 1400px) {
    .patent-page-container {
        padding: var(--ip-spacing-6) 0;
    }
}

@media (max-width: 1024px) {
    .patent-search-card .card-body {
        padding: var(--ip-spacing-6);
    }
    
    .patent-item-card .card-body {
        padding: var(--ip-spacing-5);
    }
    
    .patent-item-card .card-title {
        font-size: var(--ip-text-base);
    }
}

@media (max-width: 768px) {
    .patent-page-container {
        padding: var(--ip-spacing-4) 0;
    }
    
    .patent-page-header {
        padding: var(--ip-spacing-6) 0;
        margin-bottom: var(--ip-spacing-6);
    }
    
    .patent-page-header h1 {
        font-size: var(--ip-text-3xl);
    }
    
    .patent-search-card .card-body {
        padding: var(--ip-spacing-4);
    }
    
    .patent-item-card .card-body {
        padding: var(--ip-spacing-4);
    }
    
    .patent-item-card .card-title {
        font-size: var(--ip-text-base);
    }
    
    .btn {
        padding: var(--ip-spacing-2) var(--ip-spacing-4);
        font-size: var(--ip-text-sm);
    }
    
    .btn-sm {
        padding: var(--ip-spacing-1) var(--ip-spacing-3);
        font-size: var(--ip-text-xs);
    }
    
    /* 모바일에서 헤더 버튼들 세로 정렬 */
    .d-flex.justify-content-between.align-items-center {
        flex-direction: column;
        align-items: stretch !important;
        gap: var(--ip-spacing-4);
    }
    
    .d-flex.justify-content-between.align-items-center > div {
        display: flex;
        flex-wrap: wrap;
        gap: var(--ip-spacing-2);
        justify-content: center;
    }
}

@media (max-width: 576px) {
    .patent-page-container {
        padding: var(--ip-spacing-3) 0;
    }
    
    .patent-search-card .card-body {
        padding: var(--ip-spacing-3);
    }
    
    .patent-item-card .card-body {
        padding: var(--ip-spacing-3);
    }
    
    .patent-item-card .card-footer {
        padding: var(--ip-spacing-3);
        flex-direction: column;
        gap: var(--ip-spacing-2);
        align-items: stretch;
    }
    
    .favorite-btn {
        width: 100%;
        justify-content: center;
    }
    
    .toast-container {
        left: var(--ip-spacing-2);
        right: var(--ip-spacing-2);
        top: var(--ip-spacing-2);
    }
    
    .toast {
        min-width: auto;
        width: 100%;
    }
}

/* ===== 특수 효과 ===== */
.patent-item-card .card-body::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 100%;
    height: 100%;
    background: var(--ip-gradient-subtle);
    opacity: 0;
    border-radius: 50%;
    transition: var(--ip-transition-slow);
    z-index: -1;
}

.patent-item-card:hover .card-body::before {
    opacity: 0.5;
    transform: scale(1.5);
}

/* 호버 시 shimmer 효과 */
.patent-item-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
    transition: var(--ip-transition-base);
}

.patent-item-card:hover::after {
    left: 100%;
}

/* 스크롤 시 카드 애니메이션 */
.patent-item-card {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.6s ease forwards;
}

.patent-item-card:nth-child(1) { animation-delay: 0.1s; }
.patent-item-card:nth-child(2) { animation-delay: 0.2s; }
.patent-item-card:nth-child(3) { animation-delay: 0.3s; }
.patent-item-card:nth-child(4) { animation-delay: 0.4s; }

@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== 고대비 모드 지원 ===== */
@media (prefers-contrast: high) {
    .patent-item-card {
        border-width: 2px;
    }
    
    .btn {
        border-width: 3px;
    }
    
    .patent-badge {
        border: 2px solid currentColor;
    }
}

/* ===== 모션 감소 설정 ===== */
@media (prefers-reduced-motion: reduce) {
    .patent-item-card,
    .patent-item-card::before,
    .patent-item-card::after,
    .btn,
    .favorite-btn,
    .page-link {
        animation: none !important;
        transition: none !important;
    }
    
    .patent-item-card:hover,
    .btn:hover,
    .favorite-btn:hover,
    .page-link:hover {
        transform: none !important;
    }
}