/* =====================================================
   APP下载区块专用样式 (独立文件)
   支持 archive-topology-app 等页面
   ===================================================== */
.download-section {
    padding: 100px 0;
    background: var(--bg-light);
}

.download-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
    margin-top: 50px;
}

.download-card {
    background: var(--bg-main);
    border-radius: 16px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: all var(--transition-normal);
    display: flex;
    flex-direction: column;
}

.download-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.download-card .card-header {
    background: linear-gradient(135deg, rgba(0, 86, 210, 0.05), rgba(0, 229, 255, 0.05));
    padding: 24px;
    border-bottom: 1px solid var(--border-color);
    text-align: center;
    position: relative;
}

 .download-card .card-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
}

.download-card .card-header h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 8px;
}

.version-badge {
    display: inline-block;
    background: var(--primary-color);
    color: #fff;
    font-size: 0.8rem;
    padding: 2px 8px;
    border-radius: 12px;
    font-weight: 600;
}

.download-card .card-body {
    padding: 32px 24px;
    display: flex;
    flex-direction: column;
    align-items: center;
    flex: 1;
}

.qr-code-wrapper {
    text-align: center;
    margin-bottom: 30px;
}

.qr-code-wrapper img {
    width: 140px;
    height: 140px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    margin: 0 auto 12px;
    display: block;
}

.qr-tips {
    display: flex;
    flex-direction: column;
    gap: 8px;
    align-items: center;
}

.qr-tip-primary {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    padding: 6px 14px;
    border-radius: 20px;
    font-weight: 600;
    background: rgba(0, 86, 210, 0.08);
    color: var(--primary-color);
}

.qr-tip-secondary {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    padding: 6px 14px;
    border-radius: 20px;
    font-weight: 500;
    background: rgba(46, 204, 113, 0.1);
    color: #27ae60;
}

/* 独立主题颜色分化 */
.card-400v {
    border-top: 4px solid var(--primary-color);
}
.card-10kv {
    border-top: 4px solid #00897b;
}

/* 10kV专属：黛绿/墨绿 (Teal) 深邃主题，避免过度刺眼 */
.card-10kv .card-header {
    background: linear-gradient(135deg, rgba(0, 137, 123, 0.05), rgba(38, 166, 154, 0.05));
}
.card-10kv .card-header::before {
    background: linear-gradient(90deg, #00695c, #26a69a);
}
.card-10kv .version-badge {
    background: #00897b;
}
.card-10kv .btn-primary {
    background: #00897b;
    border-color: #00897b;
}
.card-10kv .btn-primary:hover {
    background: #00695c;
    border-color: #00695c;
    box-shadow: 0 4px 15px rgba(0, 137, 123, 0.3);
}
.card-10kv .btn-outline-dark:hover {
    color: #00897b;
    border-color: #4db6ac;
    background: rgba(38, 166, 154, 0.05);
}
.card-10kv .link-btn {
    color: #00897b;
}
.card-10kv .link-btn:hover {
    color: #00695c;
}

/* 补充线形图标的专属处理 */
.icon-stroke svg {
    fill: none;
    stroke: currentColor;
    stroke-width: 1.5;
}

.download-actions {
    width: 100%;
    max-width: 320px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.btn-full {
    width: 100%;
}

.action-row {
    display: flex;
    gap: 12px;
}

.btn-half {
    flex: 1;
    font-size: 0.95rem;
    padding: 10px 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.btn-outline-dark {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-main);
    display: inline-flex;
    border-radius: 30px;
    font-weight: 500;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-normal);
}

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

.btn-primary.btn-full {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.link-btn {
    background: none;
    border: none;
    color: var(--primary-color);
    font-size: 0.95rem;
    cursor: pointer;
    padding: 8px;
    transition: color var(--transition-fast);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.link-btn:hover {
    color: var(--primary-light);
    text-decoration: underline;
}

/* 按钮图标调整 SVG */
.icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
}
.icon svg {
    width: 1.15em;
    height: 1.15em;
    fill: currentColor;
}

/* Modal 样式 */
.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: 2000;
    display: none;
    justify-content: center;
    align-items: center;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.modal-overlay.active {
    display: flex;
    opacity: 1;
}

.modal-content {
    background: var(--bg-main);
    width: 90%;
    max-width: 600px;
    max-height: 80vh;
    border-radius: 16px;
    overflow: hidden;
    position: relative;
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-direction: column;
    transform: scale(0.95);
    transition: transform var(--transition-normal);
}

.modal-overlay.active .modal-content {
    transform: scale(1);
}

.modal-close {
    position: absolute;
    top: 16px;
    right: 20px;
    background: none;
    border: none;
    font-size: 28px;
    line-height: 1;
    color: var(--text-muted);
    cursor: pointer;
    z-index: 10;
    transition: color var(--transition-fast);
}

.modal-close:hover {
    color: var(--text-main);
}

.modal-body {
    padding: 32px;
    overflow-y: auto;
}

/* 弹窗内容区自定义滚动条 */
.modal-body::-webkit-scrollbar {
    width: 6px;
}
.modal-body::-webkit-scrollbar-track {
    background: transparent;
    border-radius: 10px;
}
.modal-body::-webkit-scrollbar-thumb {
    background-color: rgba(0, 0, 0, 0.15);
    border-radius: 10px;
}
.modal-body::-webkit-scrollbar-thumb:hover {
    background-color: rgba(0, 0, 0, 0.25);
}

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

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

.changelog-content h3 {
    margin-bottom: 24px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-main);
    font-size: 1.3rem;
}

.changelog-item {
    margin-bottom: 24px;
}

.changelog-date {
    font-weight: 700;
    color: var(--primary-color);
    margin-right: 12px;
}

.changelog-version {
    display: inline-block;
    background: var(--bg-light);
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.changelog-item ul {
    margin-top: 10px;
    padding-left: 20px;
    list-style-type: disc;
}

.changelog-item li {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 6px;
    line-height: 1.5;
}

.error-msg {
    color: #e53e3e;
    text-align: center;
    padding: 20px;
}

@media (max-width: 768px) {
    .download-cards {
        grid-template-columns: 1fr;
    }
}