/* ===== 空放官网主题 · 深青 + 铜色 ===== */
:root {
    --kf-primary: #0D5C63;
    --kf-primary-dark: #094248;
    --kf-accent: #C87941;
    --kf-accent-light: #E8A86B;
    --kf-dark: #1A2F33;
    --kf-bg: #F7F5F2;
    --kf-surface: #FFFFFF;
    --kf-border: #E2DDD6;
    --kf-text: #2C3333;
    --kf-muted: #5C6668;
    --kf-radius: 8px;
    --kf-radius-lg: 12px;
    --kf-shadow: 0 2px 12px rgba(26, 47, 51, 0.06);
    --kf-header-h: 64px;
    --kf-wrap: 1140px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    font-size: 15px;
    line-height: 1.65;
    color: var(--kf-text);
    background: var(--kf-bg);
    overflow-x: hidden;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: var(--kf-primary);
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    color: var(--kf-accent);
}

ul, ol {
    list-style: none;
}

.kf-wrap {
    width: 100%;
    max-width: var(--kf-wrap);
    margin: 0 auto;
    padding: 0 20px;
}

.kf-body-lock {
    overflow: hidden;
}

/* ===== 头部导航 ===== */
.kf-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: var(--kf-header-h);
    background: var(--kf-surface);
    border-bottom: 1px solid var(--kf-border);
    box-shadow: var(--kf-shadow);
}

.kf-header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--kf-header-h);
    gap: 16px;
}

.kf-brand-link {
    font-size: 18px;
    font-weight: 700;
    color: var(--kf-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 200px;
}

.kf-brand-link:hover {
    color: var(--kf-accent);
}

.kf-nav-list {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 4px 6px;
}

.kf-nav-item a {
    display: block;
    padding: 6px 12px;
    font-size: 14px;
    color: var(--kf-text);
    border-radius: var(--kf-radius);
    white-space: nowrap;
}

.kf-nav-item a:hover,
.kf-nav-item.kf-nav-active a {
    color: var(--kf-primary);
    background: rgba(13, 92, 99, 0.08);
    font-weight: 600;
}

.kf-menu-btn {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 40px;
    height: 40px;
    padding: 8px;
    border: 1px solid var(--kf-border);
    border-radius: var(--kf-radius);
    background: var(--kf-surface);
    cursor: pointer;
    flex-shrink: 0;
}

.kf-menu-btn span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--kf-primary);
    transition: transform 0.25s, opacity 0.25s;
}

.kf-menu-btn.kf-menu-open span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.kf-menu-btn.kf-menu-open span:nth-child(2) {
    opacity: 0;
}

.kf-menu-btn.kf-menu-open span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

.kf-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(26, 47, 51, 0.45);
    z-index: 998;
}

.kf-overlay.kf-overlay-show {
    display: block;
}

/* ===== 按钮 ===== */
.kf-btn {
    display: inline-block;
    padding: 12px 28px;
    font-size: 15px;
    font-weight: 600;
    border-radius: var(--kf-radius);
    border: 2px solid transparent;
    cursor: pointer;
    transition: background 0.2s, color 0.2s, border-color 0.2s;
    text-align: center;
}

.kf-btn-main {
    background: var(--kf-accent);
    color: #fff;
    border-color: var(--kf-accent);
}

.kf-btn-main:hover {
    background: var(--kf-accent-light);
    border-color: var(--kf-accent-light);
    color: #fff;
}

.kf-btn-line {
    background: transparent;
    color: #fff;
    border-color: rgba(255, 255, 255, 0.6);
}

.kf-btn-line:hover {
    background: rgba(255, 255, 255, 0.12);
    color: #fff;
    border-color: #fff;
}

/* ===== 首页 Hero ===== */
.kf-hero {
    padding: calc(var(--kf-header-h) + 48px) 0 0;
    background: var(--kf-dark);
    color: #fff;
}

.kf-hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
    padding-bottom: 40px;
}

.kf-label {
    display: inline-block;
    padding: 4px 12px;
    font-size: 12px;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--kf-accent-light);
    border: 1px solid rgba(200, 121, 65, 0.4);
    border-radius: 20px;
    margin-bottom: 16px;
}

.kf-hero-text h1 {
    font-size: clamp(26px, 4vw, 38px);
    font-weight: 700;
    line-height: 1.25;
    margin-bottom: 16px;
}

.kf-lead {
    font-size: 16px;
    opacity: 0.92;
    margin-bottom: 12px;
}

.kf-desc {
    font-size: 14px;
    opacity: 0.82;
    line-height: 1.7;
    margin-bottom: 28px;
}

.kf-desc strong {
    color: var(--kf-accent-light);
    font-weight: 600;
}

.kf-hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.kf-hero-visual {
    display: flex;
    justify-content: center;
}

.kf-hero-frame {
    width: 100%;
    max-width: 480px;
    border-radius: var(--kf-radius-lg);
    overflow: hidden;
    border: 3px solid rgba(200, 121, 65, 0.35);
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.25);
}

.kf-hero-frame img {
    width: 100%;
    height: auto;
    object-fit: cover;
}

.kf-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--kf-radius-lg) var(--kf-radius-lg) 0 0;
    overflow: hidden;
}

.kf-stats li {
    background: rgba(13, 92, 99, 0.5);
    padding: 20px 16px;
    text-align: center;
}

.kf-stats strong {
    display: block;
    font-size: 24px;
    color: var(--kf-accent-light);
    margin-bottom: 4px;
}

.kf-stats span {
    font-size: 13px;
    opacity: 0.85;
}

/* ===== 通用区块 ===== */
.kf-section {
    padding: 72px 0;
}

.kf-section-alt {
    background: var(--kf-surface);
}

.kf-head {
    margin-bottom: 40px;
    max-width: 640px;
}

.kf-head-center {
    text-align: center;
    margin-left: auto;
    margin-right: auto;
}

.kf-head-tag {
    display: inline-block;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--kf-accent);
    margin-bottom: 8px;
}

.kf-head h2 {
    font-size: clamp(24px, 3vw, 32px);
    color: var(--kf-primary);
    margin-bottom: 10px;
    line-height: 1.3;
}

.kf-head p {
    color: var(--kf-muted);
    font-size: 15px;
}

/* ===== 产品卡片 ===== */
.kf-product-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr 1fr;
    gap: 20px;
    align-items: stretch;
}

.kf-card {
    background: var(--kf-bg);
    border: 1px solid var(--kf-border);
    border-radius: var(--kf-radius-lg);
    padding: 24px;
    display: flex;
    flex-direction: column;
    min-width: 0;
    transition: box-shadow 0.2s, border-color 0.2s;
}

.kf-card:hover {
    box-shadow: var(--kf-shadow);
    border-color: rgba(13, 92, 99, 0.25);
}

.kf-card-featured {
    background: var(--kf-primary);
    border-color: var(--kf-primary);
    color: #fff;
}

.kf-card-featured .kf-card-num,
.kf-card-featured h3,
.kf-card-featured p,
.kf-card-featured .kf-checklist li {
    color: #fff;
}

.kf-card-featured .kf-checklist li::before {
    color: var(--kf-accent-light);
}

.kf-card-featured .kf-link {
    color: var(--kf-accent-light);
}

.kf-card-top {
    display: flex;
    align-items: baseline;
    gap: 10px;
    margin-bottom: 14px;
}

.kf-card-num {
    font-size: 13px;
    font-weight: 700;
    color: var(--kf-accent);
}

.kf-card h3 {
    font-size: 18px;
    color: var(--kf-primary);
    line-height: 1.3;
}

.kf-card p {
    font-size: 14px;
    color: var(--kf-muted);
    flex: 1;
    margin-bottom: 16px;
    line-height: 1.65;
}

.kf-card-featured p {
    opacity: 0.9;
}

.kf-checklist {
    margin-bottom: 16px;
}

.kf-checklist li {
    position: relative;
    padding-left: 18px;
    font-size: 13px;
    color: var(--kf-muted);
    margin-bottom: 6px;
}

.kf-checklist li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--kf-primary);
    font-weight: 700;
}

.kf-link {
    font-size: 14px;
    font-weight: 600;
    color: var(--kf-accent);
    margin-top: auto;
}

/* ===== Bento 优势 ===== */
.kf-bento {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.kf-bento-item {
    background: var(--kf-surface);
    border: 1px solid var(--kf-border);
    border-radius: var(--kf-radius-lg);
    padding: 22px;
    min-width: 0;
}

.kf-section-alt .kf-bento-item {
    background: var(--kf-bg);
}

.kf-bento-wide {
    grid-column: span 2;
    background: linear-gradient(135deg, var(--kf-primary) 0%, var(--kf-primary-dark) 100%);
    border-color: var(--kf-primary);
    color: #fff;
}

.kf-bento-wide h3,
.kf-bento-wide p {
    color: #fff;
}

.kf-bento-item h3 {
    font-size: 16px;
    color: var(--kf-primary);
    margin-bottom: 8px;
}

.kf-bento-item p {
    font-size: 14px;
    color: var(--kf-muted);
    line-height: 1.6;
}

/* ===== 办理步骤 ===== */
.kf-steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 48px;
}

.kf-step {
    background: var(--kf-surface);
    border: 1px solid var(--kf-border);
    border-radius: var(--kf-radius-lg);
    padding: 22px 18px;
    text-align: center;
    min-width: 0;
    position: relative;
}

.kf-section-alt .kf-step {
    background: var(--kf-bg);
}

.kf-step-no {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: var(--kf-accent);
    color: #fff;
    font-weight: 700;
    font-size: 16px;
    border-radius: 50%;
    margin-bottom: 12px;
}

.kf-step h3 {
    font-size: 15px;
    color: var(--kf-primary);
    margin-bottom: 8px;
}

.kf-step p {
    font-size: 13px;
    color: var(--kf-muted);
    line-height: 1.55;
}

/* ===== 知识 + FAQ ===== */
.kf-knowledge {
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    gap: 24px;
    align-items: start;
}

.kf-knowledge-main {
    background: var(--kf-surface);
    border: 1px solid var(--kf-border);
    border-radius: var(--kf-radius-lg);
    padding: 28px;
    min-width: 0;
}

.kf-section-alt .kf-knowledge-main {
    background: var(--kf-bg);
}

.kf-knowledge-main h3 {
    font-size: 18px;
    color: var(--kf-primary);
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--kf-accent);
}

.kf-knowledge-main p {
    font-size: 14px;
    color: var(--kf-muted);
    margin-bottom: 14px;
    line-height: 1.7;
    word-break: break-word;
}

.kf-knowledge-main strong {
    color: var(--kf-text);
}

.kf-faq {
    background: var(--kf-surface);
    border: 1px solid var(--kf-border);
    border-radius: var(--kf-radius-lg);
    padding: 24px;
    min-width: 0;
}

.kf-section-alt .kf-faq {
    background: var(--kf-bg);
}

.kf-faq > h3 {
    font-size: 17px;
    color: var(--kf-primary);
    margin-bottom: 16px;
}

.kf-faq-item {
    border-bottom: 1px solid var(--kf-border);
    padding: 12px 0;
}

.kf-faq-item:last-child {
    border-bottom: none;
}

.kf-faq-item summary {
    font-size: 14px;
    font-weight: 600;
    color: var(--kf-text);
    cursor: pointer;
    list-style: none;
    padding-right: 20px;
    position: relative;
}

.kf-faq-item summary::-webkit-details-marker {
    display: none;
}

.kf-faq-item summary::after {
    content: "+";
    position: absolute;
    right: 0;
    color: var(--kf-accent);
    font-weight: 700;
}

.kf-faq-item[open] summary::after {
    content: "−";
}

.kf-faq-item p {
    font-size: 13px;
    color: var(--kf-muted);
    margin-top: 8px;
    line-height: 1.6;
    padding-left: 2px;
}

/* ===== 资讯专栏 ===== */
.kf-article-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 18px;
}

.kf-article-item {
    background: var(--kf-surface);
    border: 1px solid var(--kf-border);
    border-radius: var(--kf-radius-lg);
    overflow: hidden;
    min-width: 0;
    transition: box-shadow 0.2s;
}

.kf-article-item:hover {
    box-shadow: var(--kf-shadow);
}

.kf-article-thumb {
    display: block;
    overflow: hidden;
    aspect-ratio: 4 / 3;
    background: var(--kf-bg);
}

.kf-article-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s;
}

.kf-article-item:hover .kf-article-thumb img {
    transform: scale(1.04);
}

.kf-article-item h3 {
    padding: 12px 14px 14px;
    font-size: 14px;
    line-height: 1.45;
    min-height: 56px;
}

.kf-article-item h3 a {
    color: var(--kf-text);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.kf-article-item h3 a:hover {
    color: var(--kf-primary);
}

/* ===== 联系 ===== */
.kf-section-contact {
    background: var(--kf-primary);
    color: #fff;
    padding: 64px 0;
}

.kf-contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    align-items: start;
}

.kf-contact-text .kf-head-tag {
    color: var(--kf-accent-light);
}

.kf-contact-text h2 {
    font-size: 28px;
    margin-bottom: 14px;
}

.kf-contact-text > p {
    font-size: 14px;
    opacity: 0.9;
    margin-bottom: 20px;
    line-height: 1.7;
}

.kf-contact-list {
    margin-bottom: 24px;
}

.kf-contact-list li {
    font-size: 14px;
    padding: 8px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.15);
}

.kf-contact-list strong {
    display: inline-block;
    min-width: 72px;
    color: var(--kf-accent-light);
}

.kf-contact-cards {
    display: grid;
    gap: 14px;
}

.kf-mini-card {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: var(--kf-radius-lg);
    padding: 18px 20px;
}

.kf-mini-card h4 {
    font-size: 15px;
    color: var(--kf-accent-light);
    margin-bottom: 6px;
}

.kf-mini-card p {
    font-size: 13px;
    opacity: 0.88;
    line-height: 1.5;
}

/* ===== 页脚 ===== */
.kf-footer {
    background: var(--kf-dark);
    color: rgba(255, 255, 255, 0.8);
    text-align: center;
    padding: 28px 0;
    font-size: 13px;
}

.kf-footer a {
    color: var(--kf-accent-light);
}

.kf-footer a:hover {
    color: #fff;
}

.kf-footer-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px 20px;
    margin-bottom: 14px;
}

.kf-footer p + p {
    margin-top: 6px;
    opacity: 0.75;
}

/* ===== 内页 ===== */
.kf-page-inner {
    padding-top: var(--kf-header-h);
}

.kf-banner {
    background: linear-gradient(135deg, var(--kf-primary) 0%, var(--kf-primary-dark) 100%);
    color: #fff;
    padding: 36px 0 32px;
}

.kf-banner h1 {
    font-size: clamp(20px, 3vw, 28px);
    line-height: 1.35;
    margin-bottom: 8px;
    word-break: break-word;
}

.kf-crumb {
    font-size: 13px;
    opacity: 0.88;
}

.kf-crumb a {
    color: var(--kf-accent-light);
}

.kf-inner-main {
    padding: 32px 0 48px;
}

.kf-inner-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 260px;
    gap: 24px;
    align-items: start;
}

.kf-inner-content {
    background: var(--kf-surface);
    border: 1px solid var(--kf-border);
    border-radius: var(--kf-radius-lg);
    padding: 24px;
    min-width: 0;
    box-shadow: var(--kf-shadow);
}

/* ===== 列表页 ===== */
.kf-list-item {
    display: flex;
    gap: 18px;
    padding: 18px 0;
    border-bottom: 1px solid var(--kf-border);
    min-width: 0;
}

.kf-list-item:last-child {
    border-bottom: none;
}

.kf-list-thumb {
    flex: 0 0 160px;
    width: 160px;
    max-width: 38%;
    margin: 0;
    border-radius: var(--kf-radius);
    overflow: hidden;
    border: 1px solid var(--kf-border);
    background: var(--kf-bg);
}

.kf-list-thumb img {
    width: 100%;
    height: 108px;
    object-fit: cover;
}

.kf-list-body {
    flex: 1;
    min-width: 0;
}

.kf-list-body h3 {
    font-size: 17px;
    margin-bottom: 8px;
    line-height: 1.35;
}

.kf-list-body h3 a {
    color: var(--kf-primary);
    font-weight: 600;
    word-break: break-word;
}

.kf-list-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 6px 14px;
    font-size: 12px;
    color: var(--kf-muted);
    margin-bottom: 8px;
}

.kf-list-desc {
    font-size: 14px;
    color: var(--kf-muted);
    line-height: 1.6;
    word-break: break-word;
}

/* ===== 分页 ===== */
.kf-pager {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    margin-top: 24px;
    padding-top: 20px;
    border-top: 1px solid var(--kf-border);
}

.kf-pager-left,
.kf-pager-right {
    flex: 0 0 auto;
}

.kf-pager-mid {
    flex: 1 1 auto;
    text-align: center;
    min-width: 0;
}

.kf-pagelist {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    align-items: center;
    justify-content: center;
}

.kf-pager-left .kf-pagelist {
    justify-content: flex-start;
}

.kf-pager-right .kf-pagelist {
    justify-content: flex-end;
}

.kf-pagelist a {
    display: inline-block;
    padding: 6px 12px;
    font-size: 13px;
    border: 1px solid var(--kf-border);
    border-radius: var(--kf-radius);
    color: var(--kf-primary);
    background: var(--kf-bg);
}

.kf-pagelist a:hover,
.kf-pagelist .thisclass a {
    background: var(--kf-primary);
    color: #fff;
    border-color: var(--kf-primary);
}

/* ===== 内容页 ===== */
.kf-article-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 18px;
    font-size: 13px;
    color: var(--kf-muted);
    padding-bottom: 16px;
    margin-bottom: 16px;
    border-bottom: 1px solid var(--kf-border);
}

.kf-article-cover {
    text-align: center;
    margin-bottom: 20px;
}

.kf-article-cover img {
    max-height: 380px;
    margin: 0 auto;
    border-radius: var(--kf-radius-lg);
    border: 1px solid var(--kf-border);
}

.kf-article-cover img[src=""],
.kf-article-cover img:not([src]) {
    display: none;
}

.kf-article-body {
    font-size: 15px;
    line-height: 1.8;
    word-break: break-word;
    overflow-wrap: break-word;
}

.kf-article-body img {
    max-width: 100%;
    height: auto;
    border-radius: var(--kf-radius);
    margin: 12px auto;
}

.kf-article-body p {
    margin-bottom: 14px;
}

.kf-article-body table {
    max-width: 100%;
    overflow-x: auto;
    display: block;
}

.kf-diyfield {
    margin-top: 16px;
    padding: 16px;
    background: var(--kf-bg);
    border: 1px solid var(--kf-border);
    border-radius: var(--kf-radius);
    font-size: 14px;
    word-break: break-word;
}

.kf-gallery-item {
    margin: 16px 0;
    text-align: center;
}

.kf-gallery-item img {
    border: 1px solid var(--kf-border);
    border-radius: var(--kf-radius);
    margin: 0 auto;
}

.kf-gallery-item figcaption {
    font-size: 13px;
    color: var(--kf-muted);
    margin-top: 8px;
}

.kf-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 20px 0;
}

.kf-tags a {
    display: inline-block;
    padding: 4px 12px;
    font-size: 12px;
    background: var(--kf-bg);
    border: 1px solid var(--kf-border);
    border-radius: 20px;
    color: var(--kf-primary);
}

.kf-tags a:hover {
    background: var(--kf-primary);
    color: #fff;
    border-color: var(--kf-primary);
}

.kf-prenext {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
    margin: 24px 0;
    padding: 16px;
    background: var(--kf-bg);
    border: 1px solid var(--kf-border);
    border-radius: var(--kf-radius-lg);
}

.kf-prenext-pre,
.kf-prenext-next {
    font-size: 13px;
    color: var(--kf-muted);
    line-height: 1.5;
    min-width: 0;
    word-break: break-word;
}

.kf-prenext-pre a,
.kf-prenext-next a {
    color: var(--kf-primary);
}

.kf-related {
    margin-top: 28px;
    padding-top: 24px;
    border-top: 1px solid var(--kf-border);
}

.kf-related h2 {
    font-size: 18px;
    color: var(--kf-primary);
    margin-bottom: 16px;
}

.kf-related-item {
    display: flex;
    gap: 14px;
    padding: 14px 0;
    border-bottom: 1px dashed var(--kf-border);
    min-width: 0;
}

.kf-related-item:last-child {
    border-bottom: none;
}

.kf-related-thumb {
    flex: 0 0 96px;
    width: 96px;
    margin: 0;
    border-radius: var(--kf-radius);
    overflow: hidden;
    border: 1px solid var(--kf-border);
}

.kf-related-thumb img {
    width: 100%;
    height: 68px;
    object-fit: cover;
}

.kf-related-body {
    flex: 1;
    min-width: 0;
}

.kf-related-body > a {
    display: block;
    font-weight: 600;
    font-size: 14px;
    margin-bottom: 4px;
    word-break: break-word;
}

.kf-related-body p {
    font-size: 13px;
    color: var(--kf-muted);
    line-height: 1.5;
}

/* ===== 侧栏 ===== */
.kf-sidebar {
    position: sticky;
    top: calc(var(--kf-header-h) + 16px);
    min-width: 0;
}

.kf-sidebar-box {
    background: var(--kf-surface);
    border: 1px solid var(--kf-border);
    border-radius: var(--kf-radius-lg);
    padding: 18px;
    box-shadow: var(--kf-shadow);
}

.kf-sidebar-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--kf-primary);
    padding-bottom: 12px;
    margin-bottom: 12px;
    border-bottom: 2px solid var(--kf-accent);
}

.kf-sidebar-list {
    max-height: 520px;
    overflow-y: auto;
}

.kf-sidebar-item {
    border-bottom: 1px dashed var(--kf-border);
}

.kf-sidebar-item:last-child {
    border-bottom: none;
}

.kf-sidebar-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 0;
    color: var(--kf-text);
}

.kf-sidebar-link:hover {
    color: var(--kf-primary);
}

.kf-sidebar-thumb {
    flex: 0 0 56px;
    width: 56px;
    height: 42px;
    border-radius: 4px;
    overflow: hidden;
    background: var(--kf-bg);
}

.kf-sidebar-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.kf-sidebar-text {
    flex: 1;
    font-size: 13px;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    min-width: 0;
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .kf-hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .kf-hero-actions {
        justify-content: center;
    }

    .kf-hero-visual {
        order: -1;
    }

    .kf-hero-frame {
        max-width: 400px;
        margin: 0 auto;
    }

    .kf-product-grid {
        grid-template-columns: 1fr;
    }

    .kf-bento {
        grid-template-columns: 1fr 1fr;
    }

    .kf-bento-wide {
        grid-column: span 2;
    }

    .kf-steps {
        grid-template-columns: repeat(2, 1fr);
    }

    .kf-knowledge {
        grid-template-columns: 1fr;
    }

    .kf-article-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .kf-contact-grid {
        grid-template-columns: 1fr;
    }

    .kf-inner-layout {
        grid-template-columns: 1fr;
    }

    .kf-sidebar {
        position: static;
    }
}

@media (max-width: 768px) {
    :root {
        --kf-header-h: 56px;
    }

    .kf-menu-btn {
        display: flex;
    }

    .kf-nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: min(300px, 85vw);
        height: 100vh;
        background: var(--kf-surface);
        padding: calc(var(--kf-header-h) + 16px) 20px 24px;
        transition: right 0.3s ease;
        z-index: 999;
        overflow-y: auto;
        box-shadow: -4px 0 20px rgba(0, 0, 0, 0.12);
    }

    .kf-nav.kf-nav-open {
        right: 0;
    }

    .kf-nav-list {
        flex-direction: column;
        align-items: stretch;
        gap: 0;
    }

    .kf-nav-item a {
        padding: 12px 8px;
        border-bottom: 1px solid var(--kf-border);
        border-radius: 0;
    }

    .kf-brand-link {
        max-width: 160px;
        font-size: 16px;
    }

    .kf-section {
        padding: 48px 0;
    }

    .kf-stats {
        grid-template-columns: repeat(2, 1fr);
    }

    .kf-bento {
        grid-template-columns: 1fr;
    }

    .kf-bento-wide {
        grid-column: span 1;
    }

    .kf-steps {
        grid-template-columns: 1fr;
    }

    .kf-article-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 14px;
    }

    .kf-article-item h3 {
        min-height: auto;
        font-size: 13px;
        padding: 10px 12px 12px;
    }

    .kf-knowledge-main,
    .kf-faq,
    .kf-inner-content {
        padding: 18px;
    }

    .kf-list-item {
        flex-direction: column;
        gap: 12px;
    }

    .kf-list-thumb {
        flex: none;
        width: 100%;
        max-width: 100%;
    }

    .kf-list-thumb img {
        height: 180px;
    }

    .kf-prenext {
        grid-template-columns: 1fr;
    }

    .kf-pager {
        flex-direction: column;
        align-items: stretch;
    }

    .kf-pager-left .kf-pagelist,
    .kf-pager-mid .kf-pagelist,
    .kf-pager-right .kf-pagelist {
        justify-content: center;
    }

    .kf-related-item {
        flex-direction: column;
    }

    .kf-related-thumb {
        width: 100%;
    }

    .kf-related-thumb img {
        height: 140px;
    }

    .kf-banner {
        padding: 28px 0 24px;
    }
}

@media (max-width: 480px) {
    .kf-wrap {
        padding: 0 14px;
    }

    .kf-hero {
        padding-top: calc(var(--kf-header-h) + 28px);
    }

    .kf-stats li {
        padding: 14px 10px;
    }

    .kf-stats strong {
        font-size: 20px;
    }

    .kf-article-grid {
        grid-template-columns: 1fr;
    }

    .kf-card,
    .kf-bento-item,
    .kf-step {
        padding: 18px;
    }

    .kf-btn {
        width: 100%;
        max-width: 280px;
    }

    .kf-hero-actions {
        flex-direction: column;
        align-items: center;
    }
}