/* ===== RESET & VARIABLES ===== */
:root {
    --hku-green: #003153;
    --hku-gold: #CC9F2E;
    --primary: var(--hku-green);
    --accent: var(--hku-gold);
    --bg-light: #f5f7fb;
    --card-bg: #ffffff;
    --text-dark: #1a1a1a;
    --text-light: #ffffff;
    --border-radius: 12px;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    --transition: 0.2s ease;
}

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

body {
    font-family: 'Inter', -apple-system, 'Microsoft YaHei', 'PingFang SC', sans-serif;
    background: var(--bg-light);
    color: var(--text-dark);
    line-height: 1.6;
    padding-top: 70px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ===== HEADER ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: var(--primary);
    color: white;
    padding: 12px 0;
    z-index: 1000;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
}

.logo {
    font-size: 1.8rem;
    font-weight: 700;
    letter-spacing: 1px;
    color: var(--hku-gold);
    cursor: pointer;
}

.nav {
    display: flex;
    gap: 12px;
    align-items: center;
    flex-wrap: wrap;
}

.nav-btn {
    background: rgba(255, 255, 255, 0.15);
    color: white;
    border: none;
    padding: 8px 18px;
    border-radius: 30px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
}

.nav-btn:hover {
    background: rgba(255, 255, 255, 0.3);
}

#lang-switch {
    background: var(--hku-gold);
    color: var(--primary);
}

#lang-switch:hover {
    background: #d4a827;
}

/* ===== SEARCH & SCAN ===== */
.search-section {
    margin: 20px 0 15px;
}

.search-container {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

#search-input {
    flex: 1;
    min-width: 200px;
    padding: 12px 18px;
    border: 2px solid #ddd;
    border-radius: 30px;
    font-size: 1rem;
    transition: var(--transition);
}

#search-input:focus {
    border-color: var(--hku-gold);
    outline: none;
}

#scan-btn {
    background: var(--primary);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 30px;
    cursor: pointer;
    font-weight: 500;
}

.search-status {
    margin-top: 8px;
    font-size: 0.9rem;
    color: #666;
    min-height: 1.5em;
}

/* ===== FILTER BAR ===== */
.filter-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 10px 0 20px;
    padding: 12px 16px;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    align-items: center;
}

.filter-bar .filter-label {
    font-weight: 600;
    color: var(--primary);
    font-size: 0.9rem;
    margin-right: 4px;
}

.filter-btn {
    padding: 6px 16px;
    border: 2px solid #e0e0e0;
    border-radius: 30px;
    background: white;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 500;
    transition: var(--transition);
    color: #555;
}

.filter-btn:hover {
    border-color: var(--hku-gold);
    color: var(--primary);
}

.filter-btn.active {
    background: var(--hku-gold);
    border-color: var(--hku-gold);
    color: var(--primary);
}

.filter-btn .count-badge {
    display: inline-block;
    background: rgba(0, 0, 0, 0.1);
    border-radius: 12px;
    padding: 0 8px;
    font-size: 0.7rem;
    margin-left: 4px;
}

.filter-btn.active .count-badge {
    background: rgba(0, 0, 0, 0.15);
}

.filter-clear {
    padding: 6px 16px;
    border: none;
    border-radius: 30px;
    background: #f0f0f0;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 500;
    transition: var(--transition);
    color: #888;
    margin-left: auto;
}

.filter-clear:hover {
    background: #e0e0e0;
    color: #333;
}

.filter-clear.hidden {
    display: none;
}

/* ===== CATEGORY NFT CARDS ===== */
.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
    margin: 20px 0;
}

.nft-card {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: var(--transition);
    border: 1px solid transparent;
    cursor: pointer;
    display: flex;
    flex-direction: column;
}

.nft-card:hover {
    transform: translateY(-4px);
    border-color: var(--hku-gold);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

.nft-card .card-inner {
    display: flex;
    padding: 16px;
    gap: 16px;
    flex: 1;
}

.nft-card .card-left {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
}

.nft-card .card-left .item-name {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 4px;
}

.nft-card .card-left .item-parent {
    font-size: 0.75rem;
    color: #999;
    background: #f0f0f0;
    padding: 2px 12px;
    border-radius: 12px;
    display: inline-block;
}

.nft-card .card-left .price-tag {
    font-size: 0.9rem;
    color: var(--hku-gold);
    font-weight: 600;
    margin-top: 8px;
}

.nft-card .card-right {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.nft-card .card-right .qr-wrapper {
    background: white;
    padding: 4px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.nft-card .card-right .qr-wrapper .qrcode {
    width: 120px;
    height: 120px;
    display: block;
}

.nft-card .card-right .nft-hash {
    font-family: monospace;
    font-size: 0.6rem;
    line-height: 1.4;
    word-break: break-all;
    text-align: center;
    background: #f5f7fb;
    padding: 6px 10px;
    border-radius: 6px;
    width: 100%;
    max-height: 60px;
    overflow-y: auto;
    color: #555;
}

/* ===== CARD FOOTER WITH TWO ROWS ===== */
.nft-card .card-footer {
    padding: 10px 16px;
    border-top: 1px solid #f0f0f0;
    display: flex;
    flex-direction: column;
    gap: 8px;
    background: #fafafa;
    align-items: center;
}

.nft-card .card-footer .card-number {
    font-size: 0.75rem;
    color: #999;
    text-align: center;
}

.nft-card .card-footer .btn-group-vertical {
    display: flex;
    flex-direction: column;
    gap: 8px;
    width: 100%;
    align-items: center;
}

.nft-card .card-footer .btn-row {
    display: flex;
    gap: 10px;
    justify-content: center;
    flex-wrap: wrap;
    width: 100%;
}

.nft-card .card-footer .btn-row .action-btn {
    flex: 1 1 0;          /* Equal width distribution */
    min-width: 90px;       /* Minimum size for readability */
    max-width: 160px;      /* Prevent buttons from becoming too wide */
    padding: 6px 12px;
    border: none;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
    white-space: nowrap;
    background: linear-gradient(135deg, var(--hku-gold), #b8922a);
    color: var(--primary);
}

.nft-card .card-footer .btn-row .action-btn:hover {
    transform: scale(1.02);
}

/* ===== NFT LOGO STYLES ===== */
.nft-logo {
    width: 60px;
    height: 60px;
    border-radius: 0; /* Rectangle */
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.8rem;
    flex-shrink: 0;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    overflow: hidden;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    transition: transform 0.2s ease;
}
.nft-logo:hover {
    transform: scale(1.05);
}
.nft-logo i {
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}
.nft-logo img {
    width: 100%;
    height: 100%;
    border-radius: 0; /* Rectangle */
    object-fit: cover;
    display: block;
}

/* Detail page logo (larger) */
.detail-logo {
    width: 80px;
    height: 80px;
    border-radius: 0; /* Rectangle */
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 2.5rem;
    flex-shrink: 0;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    overflow: hidden;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}
.detail-logo i {
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}
.detail-logo img {
    width: 100%;
    height: 100%;
    border-radius: 0; /* Rectangle */
    object-fit: cover;
    display: block;
}

/* Responsive */
@media (max-width: 768px) {
    .nft-logo {
        width: 50px;
        height: 50px;
        font-size: 1.4rem;
    }
    .detail-logo {
        width: 60px;
        height: 60px;
        font-size: 1.8rem;
    }
}
@media (max-width: 480px) {
    .nft-logo {
        width: 45px;
        height: 45px;
        font-size: 1.2rem;
    }
}

/* ===== PAGINATION ===== */
.pagination-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    margin: 20px 0 10px;
    padding: 12px 16px;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.pagination-info {
    font-size: 0.9rem;
    color: #666;
}

.pagination-info strong {
    color: var(--primary);
}

.pagination-controls {
    display: flex;
    gap: 6px;
    align-items: center;
    flex-wrap: wrap;
}

.page-btn {
    padding: 6px 14px;
    border: 1px solid #ddd;
    border-radius: 6px;
    background: white;
    cursor: pointer;
    font-size: 0.85rem;
    transition: var(--transition);
    color: #555;
}

.page-btn:hover {
    border-color: var(--hku-gold);
    color: var(--primary);
}

.page-btn.active {
    background: var(--hku-gold);
    border-color: var(--hku-gold);
    color: var(--primary);
    font-weight: 600;
}

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

.page-btn.show-all {
    background: #f0f0f0;
    border-color: #ddd;
    color: #666;
    font-weight: 500;
}

.page-btn.show-all.active {
    background: var(--hku-green);
    border-color: var(--hku-green);
    color: white;
}

/* ===== ADMIN SECTION ===== */
.admin-section {
    margin: 30px 0 20px;
    text-align: center;
}

.admin-btn {
    background: #28a745;
    color: white;
    border: none;
    padding: 12px 30px;
    border-radius: 30px;
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
}

.admin-btn:hover {
    background: #218838;
}

.admin-btn.disabled {
    background: #6c757d;
    cursor: not-allowed;
}

.admin-hint {
    margin-top: 8px;
    font-size: 0.9rem;
    color: #666;
}

/* ===== LOADING ===== */
.loading-spinner {
    grid-column: 1 / -1;
    text-align: center;
    padding: 40px;
}

.loader {
    border: 4px solid #f3f3f3;
    border-top: 4px solid var(--hku-gold);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 0 auto 12px;
}

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

/* ===== MODAL OVERLAY ===== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    z-index: 9999;
    display: none;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.modal-overlay.active {
    display: flex;
}

.modal-content {
    background: white;
    border-radius: 16px;
    max-width: 520px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    animation: modalSlideUp 0.3s ease;
}

@keyframes modalSlideUp {
    from {
        transform: translateY(30px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px 16px;
    border-bottom: 1px solid #eee;
}

.modal-header h2 {
    margin: 0;
    font-size: 1.4rem;
    color: var(--primary);
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.8rem;
    cursor: pointer;
    color: #999;
    transition: 0.2s;
    padding: 0 8px;
}

.modal-close:hover {
    color: #333;
}

.modal-body {
    padding: 24px;
}

.modal-body .form-group {
    margin-bottom: 18px;
}

.modal-body .form-group label {
    display: block;
    font-weight: 600;
    color: #555;
    margin-bottom: 4px;
    font-size: 0.9rem;
}

.modal-body .form-group input,
.modal-body .form-group select {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 1rem;
    transition: 0.2s;
}

.modal-body .form-group input:focus,
.modal-body .form-group select:focus {
    outline: none;
    border-color: var(--hku-gold);
    box-shadow: 0 0 0 3px rgba(204, 159, 46, 0.15);
}

.modal-body .form-hint {
    display: block;
    font-size: 0.75rem;
    color: #888;
    margin-top: 4px;
}

.form-actions {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
    margin-top: 24px;
    border-top: 1px solid #eee;
    padding-top: 20px;
}

.btn {
    padding: 10px 24px;
    border: none;
    border-radius: 30px;
    font-weight: 600;
    cursor: pointer;
    transition: 0.2s;
    font-size: 0.95rem;
}

.btn-primary {
    background: var(--hku-gold);
    color: var(--primary);
}

.btn-primary:hover {
    background: #b8922a;
    transform: translateY(-1px);
}

.btn-secondary {
    background: #f0f0f0;
    color: #555;
}

.btn-secondary:hover {
    background: #e0e0e0;
}

/* ===== BACK TO TOP BUTTON ===== */
.back-to-top {
    position: fixed;
    bottom: 24px;
    right: 24px;
    background: var(--hku-gold);
    color: var(--primary);
    border: none;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.2rem;
    font-weight: bold;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    transition: all 0.3s ease;
    opacity: 0;
    visibility: hidden;
    z-index: 900;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
}

/* ===== EMPTY STATE ===== */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: #888;
    grid-column: 1 / -1;
}

.empty-state .empty-icon {
    font-size: 3.5rem;
    margin-bottom: 16px;
    display: block;
}

.empty-state h3 {
    color: var(--primary);
    font-size: 1.3rem;
    margin-bottom: 8px;
}

.empty-state p {
    font-size: 0.95rem;
    color: #999;
}

.empty-state .back-link {
    display: inline-block;
    margin-top: 16px;
    color: var(--hku-gold);
    text-decoration: none;
    font-weight: 500;
}

.empty-state .back-link:hover {
    text-decoration: underline;
}

/* ===== SKELETON LOADING ===== */
.skeleton {
    background: linear-gradient(90deg, #e8e8e8 25%, #f0f0f0 50%, #e8e8e8 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: 8px;
}

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

.skeleton-card {
    min-height: 120px;
    padding: 16px;
}

.skeleton-card .skeleton-line {
    height: 16px;
    margin-bottom: 8px;
    border-radius: 4px;
}

.skeleton-card .skeleton-line.short {
    width: 60%;
}

.skeleton-card .skeleton-line.medium {
    width: 80%;
}

.skeleton-card .skeleton-line.long {
    width: 100%;
}

/* ===== SCAN MODAL ===== */
.scan-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    z-index: 2000;
    justify-content: center;
    align-items: center;
}

.scan-container {
    background: #1a1a2e;
    padding: 24px;
    border-radius: 16px;
    max-width: 500px;
    width: 90%;
    color: white;
    text-align: center;
}

.scan-container h3 {
    margin-bottom: 16px;
}

#scan-video {
    width: 100%;
    border-radius: 8px;
    background: #000;
}

#scan-result {
    margin: 12px 0;
    font-size: 1rem;
    color: #89f8e8;
}

.close-scan {
    background: #c00;
    color: white;
    border: none;
    padding: 10px 24px;
    border-radius: 30px;
    cursor: pointer;
    font-weight: 600;
}

.close-scan:hover {
    background: #a00;
}

/* ===== TOAST NOTIFICATIONS ===== */
.toast-global {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    color: white;
    padding: 14px 28px;
    border-radius: 12px;
    font-weight: 500;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
    z-index: 9999;
    transition: opacity 0.3s ease;
    max-width: 90%;
    text-align: center;
}

/* ===== MOCK INDICATOR ===== */
#mock-indicator {
    background: #ff9800;
    color: #fff;
    padding: 8px 16px;
    border-radius: 8px;
    text-align: center;
    margin: 10px 0;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

/* ===== FOOTER ===== */
.footer {
    margin-top: 40px;
    padding: 20px 0;
    text-align: center;
    border-top: 1px solid #ddd;
    color: #888;
    font-size: 0.9rem;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    body {
        padding-top: 110px;
    }

    .header-inner {
        flex-direction: column;
        align-items: stretch;
    }

    .nav {
        justify-content: center;
    }

    .category-grid {
        grid-template-columns: 1fr;
    }

    .nft-card .card-inner {
        flex-direction: column;
        align-items: center;
    }

    .nft-card .card-right .qr-wrapper .qrcode {
        width: 100px;
        height: 100px;
    }

    .filter-bar {
        flex-direction: column;
        align-items: stretch;
    }

    .filter-clear {
        margin-left: 0;
    }

    .pagination-bar {
        flex-direction: column;
        align-items: stretch;
        text-align: center;
    }

    .pagination-controls {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .search-container {
        flex-direction: column;
    }

    #scan-btn {
        width: 100%;
    }

    .filter-btn {
        font-size: 0.75rem;
        padding: 4px 12px;
    }
}