/* =========================================================
   bfk.css
   用途：百分考通用样式（features & solutions 等页面共用）
   说明：仅做增量样式，不改动 ud-styles.css 的基础体系
========================================================= */

/* ---------- Variables ---------- */
: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;
}

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

.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: 400px;
    border-radius: var(--bfk-radius);
    background: transparent;
    object-fit: contain;
    object-position: center;
    display: block;
}

/* ---------- Shot block ---------- */
.bfk-shot-block {
    border: 1px solid var(--bfk-border);
    border-radius: var(--bfk-radius);
    background: var(--bfk-white);
    box-shadow: var(--bfk-shadow-sm);
    padding: 14px;
}

.bfk-shot-head {
    padding-bottom: 12px;
}

.bfk-shot-title {
    font-size: 16px;
    line-height: 24px;
    font-weight: 700;
    color: var(--bfk-text-tertiary);
}

.bfk-shot-sub {
    margin-top: 6px;
    font-size: 13px;
    line-height: 20px;
    color: var(--bfk-text-secondary);
}

/* ---------- Mobile grid ---------- */
.bfk-mobile-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 10px;
    margin-top: 10px;
}

.bfk-mobile-item {
    margin: 0;
    border: 1px solid var(--bfk-border);
    border-radius: var(--bfk-radius);
    overflow: hidden;
    background: var(--bfk-white);
}

.bfk-mobile-item img {
    width: 100%;
    height: 460px;
    object-fit: contain;
    object-position: center;
    background: var(--bfk-white);
    display: block;
}

.bfk-mobile-item figcaption {
    padding: 8px 12px;
    font-size: 13px;
    line-height: 18px;
    color: var(--bfk-text-secondary);
    text-align: center;
}

/* ---------- 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;
}

.bfk-info-wrapper {
    display: grid;
    grid-template-columns: minmax(360px, 520px) 1fr;
    gap: 40px;
    align-items: center;
}

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

.bfk-info-content {
    max-width: 580px;
}

.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-image img,
.bfk-info-image .bfk-media-xl {
    border: none;
    border-radius: var(--bfk-radius);
    max-width: 100%;
}

/* ---------- Preview section (轮播图展示区域) ---------- */
.bfk-preview-section {
    padding-top: 80px;
    padding-bottom: 60px;
}

.bfk-preview-section .text-center {
    margin-top: 32px;
}

.bfk-preview-section .ud-main-btn {
    margin: 0 8px;
}

/* Preview 标题 */
.bfk-preview-title {
    max-width: 800px;
    margin: 0 auto 36px auto;
    text-align: center;
}

.bfk-preview-title h2 {
    font-size: 28px;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 6px;
    color: var(--bfk-text-primary);
}

.bfk-preview-title p {
    font-size: 15px;
    color: var(--bfk-muted);
    margin: 0;
}

/* Preview 内容容器 */
.bfk-preview-content {
    max-width: 1100px;
    margin: 0 auto;
}

/* Carousel tabs - 移动端不换行 */
.bfk-preview-section .bfk-carousel-tabs {
    display: flex;
    gap: 6px;
    justify-content: center;
    flex-wrap: nowrap;
    margin-bottom: 24px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding: 0 16px;
}

.bfk-preview-section .bfk-tab-btn {
    padding: 8px 18px;
    font-size: 14px;
    border: 1px solid var(--bfk-border);
    border-radius: 20px;
    background: var(--bfk-white);
    color: var(--bfk-muted);
    white-space: nowrap;
    transition: all 0.2s ease;
}

.bfk-preview-section .bfk-tab-btn:hover {
    transform: translateY(-1px);
    background: var(--bfk-white);
    box-shadow: 0px 8px 25px rgba(48, 86, 211, 0.15);
}

.bfk-preview-section .bfk-tab-btn.active {
    background-color: var(--bfk-primary);
    border-color: var(--bfk-primary);
    color: var(--bfk-white);
    font-weight: 600;
}

/* Carousel inner */
.bfk-preview-section .carousel-inner {
    border-radius: var(--bfk-radius);
    overflow: hidden;
}

.bfk-preview-section .carousel-item {
    padding: 0;
}

/* Shot block - 移动端简化 */
.bfk-preview-section .bfk-shot-block {
    border: none;
    box-shadow: none;
    padding: 0;
    background: transparent;
}

.bfk-preview-section .bfk-shot-head {
    padding: 0 0 12px 0;
    text-align: center;
}

.bfk-preview-section .bfk-shot-title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 4px;
    color: var(--bfk-text-primary);
}

.bfk-preview-section .bfk-shot-sub {
    display: none;
}

/* Mobile grid - 移动端优化 */
.bfk-preview-section .bfk-mobile-grid {
    margin-top: 16px;
    gap: 10px;
}

.bfk-preview-section .bfk-mobile-item {
    border: none;
    border-radius: var(--bfk-radius);
    background: var(--bfk-white);
    box-shadow: var(--bfk-shadow-sm);
    overflow: hidden;
}

.bfk-preview-section .bfk-mobile-item figcaption {
    padding: 8px 12px;
    font-size: 13px;
    line-height: 18px;
    color: var(--bfk-text-secondary);
    text-align: center;
}

/* 轮播图内的图片 */
.bfk-preview-section .bfk-mobile-item img,
.bfk-preview-section .bfk-shot-block img,
.bfk-preview-section .bfk-shot-block .bfk-media-xl {
    border: none;
    border-radius: var(--bfk-radius);
    box-shadow: var(--bfk-shadow-sm);
    background: var(--bfk-white);
    max-width: 100%;
}

/* 去掉轮播控制箭头 */
.bfk-preview-section .carousel-control-prev,
.bfk-preview-section .carousel-control-next {
    display: none;
}

/* 轮播指示器 - 隐藏 */
.bfk-preview-section .carousel-indicators {
    display: none;
}

/* ---------- Student preview ---------- */
.bfk-stu-preview {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.bfk-stu-card {
    border: 1px solid var(--bfk-border);
    border-radius: var(--bfk-radius);
    background: var(--bfk-white);
    box-shadow: var(--bfk-shadow-sm);
}

.bfk-stu-card--pc {
    padding: 8px;
}

.bfk-stu-card--mini {
    padding: 12px;
}

.bfk-stu-pc {
    width: 100%;
    height: 360px;
    display: block;
    border-radius: var(--bfk-radius);
    border: 1px solid var(--bfk-border);
    background: var(--bfk-white);
    object-fit: contain;
    object-position: center;
}

.bfk-stu-mini-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
}

.bfk-stu-mini-item {
    border: 1px solid var(--bfk-border);
    border-radius: var(--bfk-radius);
    overflow: hidden;
    background: var(--bfk-white);
}

.bfk-stu-mini-item img {
    width: 100%;
    height: 340px;
    display: block;
    background: var(--bfk-white);
    object-fit: contain;
    object-position: center;
}

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

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

    .bfk-media-xl {
        height: 340px;
    }

    .bfk-mobile-grid,
    .bfk-stu-mini-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .bfk-mobile-item img {
        height: 340px;
    }

    .bfk-stu-pc {
        height: 340px;
    }

    .bfk-stu-mini-item img {
        height: 360px;
    }

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

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

@media (max-width: 767px) {
    .bfk-preview-section,
    .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-media-xl {
        height: 300px;
    }

    .bfk-mobile-grid,
    .bfk-stu-mini-grid {
        grid-template-columns: 1fr;
    }

    .bfk-mobile-item img,
    .bfk-stu-mini-item img {
        height: 420px;
    }

    .bfk-stu-pc {
        height: 320px;
    }

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

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

    .bfk-preview-title h2 {
        font-size: 24px;
    }

    .bfk-preview-section .bfk-carousel-tabs {
        gap: 4px;
        padding: 0 12px;
    }

    .bfk-preview-section .bfk-tab-btn {
        padding: 6px 14px;
        font-size: 13px;
    }

    .bfk-preview-section .bfk-mobile-grid {
        gap: 8px;
    }

    .bfk-preview-section .bfk-mobile-item figcaption {
        padding: 6px 10px;
        font-size: 12px;
    }

    .bfk-preview-section .carousel-indicators button {
        width: 8px;
        height: 8px;
        margin: 0 4px;
    }

    .bfk-preview-section .carousel-indicators button.active {
        width: 20px;
    }
}

/* ---------- Case cards ---------- */
.case-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
}

.case-card {
    background: var(--bfk-white);
    border: 1px solid var(--bfk-border);
    border-radius: var(--bfk-radius);
    padding: 24px;
    box-shadow: var(--bfk-shadow-sm);
    transition: transform 0.25s ease, box-shadow 0.25s ease;
    height: 100%;
    display: flex;
    flex-direction: column;
}

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

.case-tag {
    display: inline-block;
    font-size: 12px;
    font-weight: 600;
    padding: 6px 12px;
    border-radius: 999px;
    background: rgba(48, 86, 211, 0.08);
    color: var(--bfk-primary);
    margin-bottom: 12px;
}

.case-title {
    font-size: 18px;
    font-weight: 700;
    line-height: 1.4;
    margin-bottom: 12px;
    color: var(--bfk-text-primary);
}

.case-desc {
    font-size: 14px;
    line-height: 24px;
    color: var(--bfk-text-secondary);
    margin-bottom: 16px;
    flex-grow: 1;
}

.case-meta {
    font-size: 13px;
    color: var(--bfk-muted);
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 16px;
    padding-top: 12px;
    border-top: 1px solid var(--bfk-border);
}

.case-meta span {
    display: flex;
    align-items: center;
    gap: 4px;
}

.case-actions {
    margin-top: auto;
}

.case-actions .ud-main-btn {
    padding: 10px 18px;
    font-size: 14px;
}

/* Case filters */
.case-filters {
    display: flex;
    gap: 10px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 36px;
}

.case-filter-btn {
    padding: 8px 20px;
    font-size: 14px;
    border: 1px solid var(--bfk-border);
    border-radius: 20px;
    background: var(--bfk-white);
    color: var(--bfk-muted);
    cursor: pointer;
    transition: all 0.2s ease;
}

.case-filter-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0px 8px 25px rgba(48, 86, 211, 0.15);
}

.case-filter-btn.active {
    background-color: var(--bfk-primary);
    border-color: var(--bfk-primary);
    color: var(--bfk-white);
    font-weight: 600;
}

@media (max-width: 991px) {
    .case-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 20px;
    }
}

@media (max-width: 575px) {
    .case-grid {
        grid-template-columns: repeat(1, minmax(0, 1fr));
        gap: 16px;
    }

    .case-card {
        padding: 20px;
    }
}

/* ---------- Case page sections ---------- */
.case-filter-section {
    padding-top: 80px;
    padding-bottom: 20px;
}

.case-list-section {
    padding-top: 20px;
}

/* Case stats */
.case-stats-row {
    margin-top: 40px;
}

.case-stat-number {
    font-size: 32px;
    color: var(--bfk-primary);
}

/* Case CTA */
.case-cta-text {
    margin-top: 16px;
    margin-bottom: 24px;
}

/* ---------- Pricing comparison table ---------- */
.pricing-comparison-section {
    padding-top: 40px;
}

.pricing-table-wrapper {
    background: var(--bfk-white);
    border: 1px solid var(--bfk-border);
    border-radius: var(--bfk-radius);
    padding: 24px;
    box-shadow: var(--bfk-shadow-sm);
    overflow: hidden;
}

.pricing-table {
    width: 100%;
    margin-bottom: 0;
}

.pricing-table thead {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.pricing-table thead th {
    color: var(--bfk-white);
    font-weight: 600;
    font-size: 15px;
    padding: 18px 16px;
    border: none;
    text-align: center;
    vertical-align: middle;
}

.pricing-table thead th:first-child {
    text-align: left;
    border-top-left-radius: 8px;
}

.pricing-table thead th:last-child {
    border-top-right-radius: 8px;
}

.pricing-table tbody tr {
    transition: background-color 0.2s ease;
}

.pricing-table tbody tr:hover {
    background-color: rgba(48, 86, 211, 0.03);
}

.pricing-table tbody tr:nth-child(even) {
    background-color: rgba(0, 0, 0, 0.02);
}

.pricing-table tbody tr:nth-child(even):hover {
    background-color: rgba(48, 86, 211, 0.05);
}

.pricing-table tbody td {
    padding: 16px;
    border-bottom: 1px solid var(--bfk-border);
    color: var(--bfk-text-secondary);
    font-size: 14px;
    text-align: center;
    vertical-align: middle;
}

.pricing-table tbody td:first-child {
    font-weight: 600;
    color: var(--bfk-text-primary);
    text-align: left;
    min-width: 180px;
}

.pricing-table tbody tr:last-child td {
    border-bottom: none;
}

/* Highlight recommended column */
.pricing-table thead th.recommended {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    position: relative;
}

.pricing-table thead th.recommended::after {
    content: '推荐';
    position: absolute;
    top: -8px;
    right: 8px;
    background: #ff6b6b;
    color: white;
    font-size: 11px;
    padding: 2px 8px;
    border-radius: 10px;
    font-weight: 700;
}

.pricing-table tbody td.recommended {
    background-color: rgba(245, 87, 108, 0.05);
    font-weight: 600;
    color: var(--bfk-primary);
}

/* Check/cross icons */
.pricing-check {
    color: #10b981;
    font-weight: 600;
}

.pricing-cross {
    color: #ef4444;
}

.pricing-table-cta {
    margin-top: 24px;
    text-align: center;
}

.pricing-table-cta .ud-main-btn + .ud-main-btn {
    margin-left: 12px;
}

/* Responsive table */
@media (max-width: 991px) {
    .pricing-table-wrapper {
        padding: 16px;
        overflow-x: auto;
    }

    .pricing-table {
        min-width: 700px;
    }

    .pricing-table thead th,
    .pricing-table tbody td {
        padding: 12px 10px;
        font-size: 13px;
    }

    .pricing-table tbody td:first-child {
        min-width: 150px;
    }
}

@media (max-width: 767px) {
    .pricing-table-wrapper {
        padding: 12px;
    }

    .pricing-table {
        min-width: 600px;
    }

    .pricing-table thead th,
    .pricing-table tbody td {
        padding: 10px 8px;
        font-size: 12px;
    }

    .pricing-table tbody td:first-child {
        min-width: 120px;
    }
}

/* ---------- 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-section-alt {
    background: #f3f4fe;
}

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

@media (max-width: 767px) {
    .help-nav-section {
        padding-top: 40px;
        padding-bottom: 30px;
    }

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

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

/* ---------- 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);
}

@media (max-width: 767px) {
    .breadcrumb-nav {
        padding: 12px 0;
    }

    .breadcrumb {
        font-size: 13px;
    }

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

/* ---------- 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);
    }
}