/*
    main.css
*/

/* =========================================================
   CSS 变量
========================================================= */
:root {
    /* Colors */
    --bfk-white: #ffffff;
    --bfk-primary: #3056d3;
    --bfk-bg-alt: #f8f9fe;

    /* Text colors */
    --bfk-text-primary: #212b36;
    --bfk-text-secondary: rgba(99, 115, 129, 0.95);
    --bfk-text-tertiary: rgba(17, 24, 39, 0.92);
    --bfk-muted: rgba(99, 115, 129, 0.9);

    /* Borders & Shadows */
    --bfk-border: rgba(0, 0, 0, 0.08);
    --bfk-shadow: 0px 20px 95px rgba(201, 203, 204, 0.25);
    --bfk-shadow-sm: 0px 18px 60px rgba(201, 203, 204, 0.16);

    /* Border radius */
    --bfk-radius: 10px;
    --bfk-radius-sm: 8px;
}

/* =========================================================
   Device & layout utilities
========================================================= */
.device-item {
    text-align: center;
    margin-bottom: 5px;
}
.margin-center {
    margin: auto;
}
.width-300 {
    width: 300px;
}

.paper-main-image {
    border-radius: 16px 16px 0 0;
}

.ud-hero-features {
    margin-bottom: 40px;
}

.hero-feature-list {
    display: flex;
    justify-content: center;
    gap: 32px;
    padding: 0;
    margin: 0;
    list-style: none;
    flex-wrap: wrap;
}

.hero-feature-list li {
    display: flex;
    align-items: center;
    gap: 8px;
    color: rgba(255, 255, 255, 0.9);
    font-size: 15px;
    font-weight: 500;
}

.hero-feature-list i {
    font-size: 20px;
    opacity: 0.9;
}

.ud-footer-bottom-left-img {
    height: 18px;
    width: auto;
    vertical-align: middle;
    margin-right: 4px;
}

/* =========================================================
   Feature cards
========================================================= */
.bfk-feature-card {
    background: var(--bfk-white);
    border: 1px solid var(--bfk-border);
    border-radius: var(--bfk-radius);
    padding: 26px 22px;
    height: 100%;
    box-shadow: var(--bfk-shadow-sm);
    transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.bfk-feature-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--bfk-shadow);
}

.bfk-feature-card .ud-feature-icon {
    margin-bottom: 18px;
}

.bfk-feature-card .ud-feature-title {
    margin-bottom: 10px;
}

.bfk-feature-kicker {
    display: inline-block;
    margin-bottom: 10px;
    font-size: 13px;
    font-weight: 700;
    line-height: 1;
    color: var(--bfk-primary);
    letter-spacing: 0.04em;
}

.bfk-feature-card .ud-feature-desc {
    margin-bottom: 16px;
    color: var(--bfk-muted);
}

.bfk-feature-card--media {
    overflow: hidden;
}

.bfk-feature-media {
    margin: -6px -2px 20px;
}

.bfk-feature-media .bfk-svg {
    border-radius: 16px;
}

.bfk-feature-cta {
    padding: 12px 18px;
}

/* =========================================================
   Bullets
========================================================= */
.bfk-bullets {
    margin: 0 0 16px 0;
    padding-left: 18px;
    color: var(--bfk-text-secondary);
    font-size: 15px;
    line-height: 26px;
}

.bfk-bullets li {
    margin: 2px 0;
}

.bfk-bullets--dense {
    font-size: 14px;
    line-height: 24px;
}

/* =========================================================
   Inline actions
========================================================= */
.bfk-inline-actions {
    margin-top: 18px;
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

/* =========================================================
   Large media
========================================================= */
.bfk-media-xl {
    width: 100%;
    height: 520px;
    border-radius: var(--bfk-radius);
    background: transparent;
    object-fit: contain;
    object-position: center;
    display: block;
}

.bfk-svg {
    width: 100%;
    height: auto;
    border-radius: var(--bfk-radius);
    background: transparent;
    object-fit: contain;
    object-position: center;
    display: block;
}

/* =========================================================
   Buttons row
========================================================= */
.bfk-btn-row {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    margin-top: 16px;
}

.bfk-btn-row .ud-main-btn {
    padding: 12px 18px;
}

/* =========================================================
   Info section (独立组件，完全替代 ud-about)
========================================================= */
.bfk-info-section {
    padding-top: 120px;
    padding-bottom: 90px;
}

.bfk-info-section--alt {
    background: var(--bfk-bg-alt);
}

/* 反向布局：图片在左，内容在右 */
.bfk-info-section--reverse .bfk-info-content-wrapper {
    order: 2;
}

.bfk-info-section--reverse .bfk-info-image {
    order: 1;
}

/* 反向布局时交换列宽，确保图片占据足够空间 */
.bfk-info-section--reverse .bfk-info-wrapper {
    grid-template-columns: minmax(300px, 650px) 1fr;
}

.bfk-info-wrapper {
    display: grid;
    grid-template-columns: 1fr minmax(300px, 650px);
    gap: 40px;
    align-items: center;
}

.bfk-info-content-wrapper {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.bfk-info-content {
    max-width: 650px;
}

.bfk-info-content .tag {
    display: inline-block;
    font-size: 14px;
    font-weight: 600;
    color: var(--bfk-primary);
    margin-bottom: 12px;
}

.bfk-info-content h2 {
    font-size: 32px;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 18px;
    color: var(--bfk-text-primary);
}

.bfk-info-content p {
    font-size: 16px;
    line-height: 28px;
    color: var(--bfk-muted);
    margin-bottom: 16px;
}

.bfk-info-content .bfk-inline-actions {
    margin-top: 24px;
}

.bfk-info-image {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.bfk-info-section--monitor .container {
    max-width: 1280px;
}

.bfk-info-section--monitor .bfk-info-wrapper {
    grid-template-columns: minmax(0, 1fr) minmax(580px, 1.12fr);
    gap: 64px;
}

.bfk-info-section--monitor .bfk-info-content {
    max-width: 700px;
    padding-right: 8px;
}

.bfk-info-section--monitor .bfk-info-content .tag {
    margin-bottom: 14px;
}

.bfk-info-section--monitor .bfk-info-content h2 {
    max-width: 680px;
    font-size: 34px;
    line-height: 1.28;
    margin-bottom: 22px;
}

.bfk-info-section--monitor .bfk-info-content p {
    max-width: 620px;
    font-size: 17px;
    line-height: 31px;
    margin-bottom: 22px;
}

.bfk-info-section--monitor .bfk-bullets {
    max-width: 640px;
    margin-bottom: 22px;
    font-size: 16px;
    line-height: 30px;
}

.bfk-info-section--monitor .bfk-bullets li {
    margin: 6px 0;
}

.bfk-info-section--monitor .bfk-inline-actions {
    margin-top: 28px;
}

.bfk-info-image--monitor {
    justify-content: flex-end;
}

.bfk-info-section--monitor .bfk-svg {
    max-width: 760px;
}

/* =========================================================
   Help page sections
========================================================= */
.help-nav-section {
    padding-top: 60px;
    padding-bottom: 40px;
}

.help-nav-title {
    margin-bottom: 40px;
}

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

.help-nav-buttons .ud-main-btn {
    margin: 0;
}

.help-doc-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
}

.help-doc-card {
    display: flex;
    min-height: 168px;
    flex-direction: column;
    align-items: flex-start;
    padding: 24px 22px;
    border: 1px solid var(--bfk-border);
    border-radius: var(--bfk-radius);
    background: var(--bfk-white);
    box-shadow: var(--bfk-shadow-sm);
    color: var(--bfk-text-primary);
    transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}

.help-doc-card:hover {
    color: var(--bfk-text-primary);
    border-color: rgba(48, 86, 211, 0.22);
    box-shadow: var(--bfk-shadow);
    transform: translateY(-3px);
}

.help-doc-icon {
    display: inline-flex;
    width: 44px;
    height: 44px;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
    border-radius: 10px;
    background: rgba(48, 86, 211, 0.08);
    color: var(--bfk-primary);
    font-size: 22px;
}

.help-doc-card strong {
    margin-bottom: 8px;
    font-size: 17px;
    line-height: 1.35;
    color: var(--bfk-text-primary);
}

.help-doc-card span:last-child {
    color: var(--bfk-muted);
    font-size: 14px;
    line-height: 24px;
}

.help-section-alt {
    background: #f3f4fe;
}

.help-contact-note {
    margin-top: 10px;
}

/* =========================================================
   Common utility classes
========================================================= */
.trail-qrcode {
    max-width: 150px;
}

.contact-note {
    margin-top: 10px;
}

/* =========================================================
   Breadcrumb navigation
========================================================= */
.breadcrumb-nav {
    padding: 16px 0;
    margin-bottom: 0;
}

.breadcrumb {
    background: transparent;
    padding: 0;
    margin: 0;
    font-size: 14px;
    list-style: none;
    display: flex;
    flex-wrap: wrap;
}

.breadcrumb-item {
    color: var(--bfk-text-secondary);
}

.breadcrumb-item a {
    color: var(--bfk-primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

.breadcrumb-item a:hover {
    color: var(--bfk-text-primary);
    text-decoration: underline;
}

.breadcrumb-item.active {
    color: var(--bfk-text-primary);
    font-weight: 500;
}

.breadcrumb-item + .breadcrumb-item::before {
    content: '/';
    padding: 0 8px;
    color: var(--bfk-border);
}

/* =========================================================
   Background utilities
========================================================= */
.bg-slate-50 {
    background-color: #F8FAFC;
}

/* =========================================================
   首页数据统计 section
========================================================= */
#statistics.ud-features {
    background: #f3f4fe;
    position: relative;
    z-index: 1;
}

#statistics.ud-features .shape {
    position: absolute;
    z-index: -1;
    left: 0;
    bottom: 0;
}

/* =========================================================
   Mobile Submenu Toggle
========================================================= */
@media (max-width: 991px) {
    .nav-item .ud-submenu {
        display: none;
    }

    .nav-item .ud-submenu[style*="block"] {
        display: block;
    }

    .ud-mobile-toggle {
        cursor: pointer;
    }

    .ud-mobile-toggle::after {
        transition: transform 0.3s ease;
    }

    .ud-mobile-toggle.active::after {
        transform: rotate(135deg);
    }
}

/* =========================================================
   Responsive
========================================================= */
@media (max-width: 991px) {
    .bfk-info-section {
        padding-top: 70px;
        padding-bottom: 50px;
    }

    .bfk-feature-card {
        padding: 22px 18px;
    }

    .bfk-feature-media {
        margin-bottom: 18px;
    }

    .bfk-info-wrapper {
        grid-template-columns: 1fr;
        gap: 18px;
    }

    .bfk-info-section--reverse .bfk-info-wrapper {
        grid-template-columns: 1fr;
    }

    .bfk-info-wrapper > .bfk-info-content-wrapper {
        order: 1;
    }

    .bfk-info-wrapper > .bfk-info-image {
        order: 2;
    }

    .bfk-info-content {
        max-width: 100%;
    }

    .bfk-info-section--monitor .container {
        max-width: 100%;
    }

    .bfk-info-section--monitor .bfk-info-wrapper {
        grid-template-columns: 1fr;
        gap: 28px;
    }

    .bfk-info-section--monitor .bfk-info-content,
    .bfk-info-section--monitor .bfk-info-content h2,
    .bfk-info-section--monitor .bfk-info-content p,
    .bfk-info-section--monitor .bfk-bullets {
        max-width: 100%;
    }

    .bfk-info-image--monitor {
        justify-content: center;
    }

    .help-nav-section {
        padding-top: 40px;
        padding-bottom: 30px;
    }

    .help-nav-title {
        margin-bottom: 28px;
    }

    .help-nav-buttons {
        gap: 8px;
    }

    .help-nav-buttons .ud-main-btn {
        padding: 10px 16px;
        font-size: 14px;
    }

    .help-doc-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 14px;
    }

    .help-doc-card {
        min-height: 156px;
    }
}

@media (max-width: 767px) {
    .bfk-info-section > .container {
        padding-left: 24px;
        padding-right: 24px;
    }

    .ud-features > .container {
        padding-left: 24px;
        padding-right: 24px;
    }

    .bfk-info-section {
        padding-top: 50px;
        padding-bottom: 40px;
    }

    .bfk-banner-subtitle {
        font-size: 15px;
        line-height: 24px;
    }

    .bfk-hero-actions .ud-main-btn {
        width: 100%;
        text-align: center;
    }

    .bfk-info-content h2 {
        font-size: 26px;
    }

    .bfk-info-content p {
        font-size: 15px;
        line-height: 26px;
    }

    .bfk-info-wrapper {
        gap: 22px;
    }

    .bfk-feature-card--media {
        padding-left: 10px;
        padding-right: 10px;
    }

    .bfk-feature-card--media .bfk-feature-media {
        margin-left: -10px;
        margin-right: -10px;
    }

    .ud-about > .container {
        padding-left: 24px;
        padding-right: 24px;
    }

    .ud-about-image {
        padding: 12px;
    }

    .bfk-info-section--reverse .bfk-info-wrapper {
        grid-template-columns: 1fr;
    }

    .bfk-info-section--monitor .bfk-info-wrapper {
        gap: 22px;
    }

    .bfk-info-section--monitor .bfk-info-content h2 {
        font-size: 30px;
        line-height: 1.32;
        margin-bottom: 18px;
    }

    .bfk-info-section--monitor .bfk-info-content p {
        font-size: 15px;
        line-height: 28px;
        margin-bottom: 18px;
    }

    .bfk-info-section--monitor .bfk-bullets {
        font-size: 15px;
        line-height: 27px;
    }

    .breadcrumb-nav {
        padding: 12px 0;
    }

    .breadcrumb {
        font-size: 13px;
    }

    .breadcrumb-item + .breadcrumb-item::before {
        padding: 0 6px;
    }

    .help-doc-grid {
        grid-template-columns: 1fr;
    }

    .help-nav-title h2 {
        font-size: 30px;
        line-height: 1.35;
    }

    .help-nav-title p {
        font-size: 15px;
        line-height: 26px;
    }

    .help-doc-card {
        min-height: auto;
        padding: 20px 18px;
    }

    .ud-banner-content {
        padding-left: 18px;
        padding-right: 18px;
    }

    .ud-banner-subtitle {
        font-size: 14px;
        line-height: 24px;
    }

    #faq .ud-single-faq .ud-faq-btn {
        align-items: flex-start;
        gap: 12px;
        font-size: 15px;
        line-height: 23px;
    }

    #faq .ud-single-faq .ud-faq-btn span.icon {
        width: 34px;
        height: 34px;
        margin-right: 0;
    }

    #faq .ud-single-faq .ud-faq-btn span:last-child {
        min-width: 0;
        flex: 1;
        white-space: normal;
    }

    #faq .ud-single-faq .ud-faq-body {
        padding-left: 61px;
    }
}