:root {
    --primary-color: #0f766e;
    --primary-dark: #115e59;
    --primary-light: #14b8a6;
    --accent-color: #ea580c;
    --accent-light: #fb923c;
    --text-color: #1e293b;
    --text-muted: #64748b;
    --surface: #ffffff;
    --surface-alt: #f0fdfa;
    --surface-dark: #134e4a;
    --border-color: #ccfbf1;
    --shadow-sm: 0 1px 3px rgba(15, 118, 110, 0.08);
    --shadow-md: 0 8px 24px rgba(15, 118, 110, 0.12);
    --radius: 12px;
    --radius-lg: 16px;
    --transition: 0.25s ease;
}

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

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', -apple-system, sans-serif;
    color: var(--text-color);
    line-height: 1.65;
    background: var(--surface);
    overflow-x: hidden;
}

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

html {
    scroll-behavior: smooth;
}

/* 导航 */
.z87b85navbar {
    background: rgba(255, 255, 255, 0.96);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border-color);
    padding: 0.65rem 0;
    position: sticky;
    top: 0;
    z-index: 1030;
}

.z87b85navbar-brand img {
    height: 42px;
    width: auto;
}

.z87b85nav-link {
    color: var(--text-color) !important;
    font-weight: 500;
    font-size: 0.92rem;
    padding: 0.45rem 0.75rem !important;
    border-radius: 8px;
    transition: color var(--transition), background var(--transition);
}

.z87b85nav-link:hover,
.z87b85nav-link.active {
    color: var(--primary-color) !important;
    background: var(--surface-alt);
}

.navbar-toggler {
    border: none;
    padding: 0.4rem;
}

.navbar-collapse {
    background: var(--surface);
}

@media (max-width: 991px) {
    .navbar-collapse {
        margin-top: 0.5rem;
        padding: 0.75rem;
        border-radius: var(--radius);
        border: 1px solid var(--border-color);
        max-height: 70vh;
        overflow-y: auto;
    }
}

/* 通用区块 */
.z87b85section {
    padding: 4rem 0;
}

.z87b85section-head {
    margin-bottom: 2.5rem;
}

.z87b85section-head h2 {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 700;
    color: var(--primary-dark);
    margin-bottom: 0.5rem;
}

.z87b85section-head p {
    color: var(--text-muted);
    margin: 0;
    max-width: 560px;
}

.z87b85section-head.text-center p {
    margin-left: auto;
    margin-right: auto;
}

.z87b85section-head--left p {
    max-width: 100%;
}

/* 按钮 */
.z87b85btn {
    padding: 0.65rem 1.25rem;
    border-radius: 10px;
    font-weight: 600;
    font-size: 0.9rem;
    border: 2px solid transparent;
    transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    white-space: normal;
    line-height: 1.3;
}

.z87b85btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: #fff !important;
    border-color: transparent;
}

.z87b85btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    color: #fff !important;
}

.z87b85btn-outline {
    background: transparent;
    color: var(--primary-color) !important;
    border-color: var(--primary-color);
}

.z87b85btn-outline:hover {
    background: var(--surface-alt);
    color: var(--primary-dark) !important;
}

.z87b85btn-ghost {
    background: rgba(255, 255, 255, 0.15);
    color: #fff !important;
    border-color: rgba(255, 255, 255, 0.4);
}

.z87b85btn-ghost:hover {
    background: rgba(255, 255, 255, 0.25);
    color: #fff !important;
}

/* 英雄区 */
.z87b85hero-section {
    position: relative;
    padding: 4.5rem 0 4rem;
    background: linear-gradient(145deg, var(--surface-dark) 0%, var(--primary-color) 55%, var(--primary-light) 100%);
    color: #fff;
    overflow: hidden;
}

.z87b85hero-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 20% 80%, rgba(234, 88, 12, 0.15) 0%, transparent 45%),
        radial-gradient(circle at 85% 15%, rgba(255, 255, 255, 0.08) 0%, transparent 40%);
    pointer-events: none;
}

.z87b85hero-content {
    position: relative;
    z-index: 1;
}

.z87b85hero-badge {
    display: inline-block;
    padding: 0.35rem 0.85rem;
    background: rgba(255, 255, 255, 0.12);
    border: 1px solid rgba(255, 255, 255, 0.25);
    border-radius: 999px;
    font-size: 0.8rem;
    margin-bottom: 1rem;
    letter-spacing: 0.02em;
}

.z87b85hero-title {
    font-size: clamp(1.75rem, 4.5vw, 2.75rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
}

.z87b85hero-subtitle {
    font-size: clamp(0.95rem, 2vw, 1.1rem);
    opacity: 0.92;
    margin-bottom: 1.5rem;
    max-width: 540px;
}

.z87b85hero-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.z87b85hero-visual {
    position: relative;
    z-index: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 1rem;
}

.z87b85hero-image {
    max-width: 280px;
    width: 100%;
    border-radius: var(--radius-lg);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

/* 特点区 */
.z87b85features-section {
    background: var(--surface-alt);
}

.z87b85feature-card {
    background: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
    height: 100%;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition), box-shadow var(--transition);
    overflow: hidden;
}

.z87b85feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.z87b85feature-card--accent {
    background: linear-gradient(160deg, var(--primary-dark), var(--primary-color));
    border-color: transparent;
    color: #fff;
}

.z87b85feature-card--accent h3,
.z87b85feature-card--accent p {
    color: #fff;
}

.z87b85feature-card--accent .z87b85feature-icon {
    background: rgba(255, 255, 255, 0.2);
    color: #fff;
}

.z87b85feature-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--primary-dark);
}

.z87b85feature-card p {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin: 0;
}

.z87b85feature-icon {
    width: 52px;
    height: 52px;
    border-radius: 12px;
    background: var(--surface-alt);
    color: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.35rem;
    margin-bottom: 1rem;
}

/* 统计区 */
.z87b85stats-section {
    background: var(--surface-dark);
    color: #fff;
    padding: 2.5rem 0;
}

.z87b85stats-row {
    margin: 0;
}

.z87b85stat-item {
    text-align: center;
    padding: 1rem 0.5rem;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: var(--radius);
    height: 100%;
    min-height: 88px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.z87b85stat-number {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 700;
    color: var(--accent-light);
    line-height: 1.2;
}

.z87b85stat-label {
    font-size: 0.88rem;
    opacity: 0.88;
    margin-top: 0.25rem;
}

/* 下载区 */
.z87b85download-section {
    background: var(--surface);
}

.z87b85download-card {
    background: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    min-height: 0;
}

.z87b85download-card--compact {
    padding: 1.25rem;
}

.z87b85download-card-head {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1rem;
}

.z87b85download-card-head h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--primary-dark);
    margin-bottom: 0.2rem;
}

.z87b85download-card-head .text-muted {
    font-size: 0.85rem;
}

.z87b85platform-icon {
    width: 48px;
    height: 48px;
    min-width: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    color: #fff;
    flex-shrink: 0;
}

.z87b85pc-icon {
    background: linear-gradient(135deg, #0369a1, #0ea5e9);
}

.z87b85android-icon {
    background: linear-gradient(135deg, #15803d, #22c55e);
}

.z87b85ios-icon {
    background: linear-gradient(135deg, #1e293b, #475569);
}

.z87b85app-icon {
    background: linear-gradient(135deg, var(--accent-color), var(--accent-light));
}

.z87b85download-list {
    list-style: none;
    padding: 0;
    margin: 0 0 1.25rem;
    flex: 1;
}

.z87b85download-list li {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    font-size: 0.88rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
    line-height: 1.45;
}

.z87b85download-list li i {
    color: var(--primary-color);
    margin-top: 0.2rem;
    flex-shrink: 0;
}

.z87b85download-card .z87b85btn {
    margin-top: auto;
}

/* 知识指南 */
.z87b85knowledge-section {
    background: var(--surface-alt);
}

.z87b85knowledge-panel {
    background: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 0.5rem;
    overflow: hidden;
}

.z87b85knowledge-item {
    display: flex;
    gap: 1rem;
    padding: 1.25rem;
    border-bottom: 1px solid var(--border-color);
    align-items: flex-start;
}

.z87b85knowledge-item:last-child {
    border-bottom: none;
}

.z87b85step-num {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-color);
    line-height: 1;
    min-width: 2.5rem;
    flex-shrink: 0;
}

.z87b85knowledge-item h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--primary-dark);
    margin-bottom: 0.35rem;
}

.z87b85knowledge-item p {
    font-size: 0.88rem;
    color: var(--text-muted);
    margin: 0;
}

/* 安全区 */
.z87b85security-section {
    background: var(--surface);
}

.z87b85security-card {
    background: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 1.25rem;
    height: 100%;
    text-align: center;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition);
}

.z87b85security-card:hover {
    box-shadow: var(--shadow-md);
}

.z87b85security-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 0.75rem;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
}

.z87b85security-card h3 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--primary-dark);
    margin-bottom: 0.4rem;
}

.z87b85security-card p {
    font-size: 0.82rem;
    color: var(--text-muted);
    margin: 0;
    line-height: 1.5;
}

/* FAQ */
.z87b85faq-section {
    background: var(--surface-alt);
}

.z87b85faq-card {
    background: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 1.25rem;
    height: 100%;
    overflow: hidden;
}

.z87b85faq-card h5 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--primary-dark);
    margin-bottom: 0.5rem;
}

.z87b85faq-card p {
    font-size: 0.88rem;
    color: var(--text-muted);
    margin: 0;
}

/* 文章区 */
.z87b85article-section {
    background: var(--surface);
    border-top: 1px solid var(--border-color);
}

.z87b85article-card {
    border: 1px solid var(--border-color) !important;
    border-radius: var(--radius) !important;
    overflow: hidden;
    box-shadow: var(--shadow-sm) !important;
}

.z87b85thumb-home {
    height: 110px;
    width: 100%;
    object-fit: cover;
}

.z87b85article-card .card-body {
    padding: 0.75rem;
}

.z87b85article-link {
    color: var(--text-color);
    font-weight: 500;
}

.z87b85article-link:hover {
    color: var(--primary-color);
}

/* 页脚 */
.z87b85footer {
    background: var(--surface-dark);
    color: rgba(255, 255, 255, 0.85);
    padding: 3rem 0 1.5rem;
}

.z87b85footer-desc {
    font-size: 0.88rem;
    opacity: 0.8;
    line-height: 1.6;
}

.z87b85footer-title {
    color: #fff;
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.z87b85footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.z87b85footer-links li {
    margin-bottom: 0.5rem;
}

.z87b85footer-link {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: 0.88rem;
    transition: color var(--transition);
}

.z87b85footer-link:hover {
    color: var(--accent-light);
}

.z87b85friend-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem 1rem;
    list-style: none;
    padding: 0;
    margin: 0;
}

.z87b85friend-links a {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.85rem;
    text-decoration: none;
}

.z87b85friend-links a:hover {
    color: var(--accent-light);
}

.z87b85footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.12);
    padding-top: 1.25rem;
    font-size: 0.85rem;
}

.z87b85footer-bottom a {
    color: rgba(255, 255, 255, 0.75);
    text-decoration: none;
}

.z87b85footer-bottom a:hover {
    color: #fff;
}

/* 列表页 / 内页 */
.z87b85page-main {
    padding: 2.5rem 0 3rem;
    background: var(--surface-alt);
    min-height: 50vh;
}

.z87b85page-card {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.z87b85page-card .card-body {
    padding: 1.25rem;
}

.z87b85sidebar-card {
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    margin-bottom: 1rem;
}

.z87b85sidebar-card .card-body {
    padding: 1rem 1.25rem;
}

.z87b85article-content {
    line-height: 1.8;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.z87b85article-content img {
    max-width: 100%;
    height: auto;
}

/* 分页 */
.pagebar .pagelist {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem;
    list-style: none;
    padding-left: 0;
    margin: 0;
}

.pagebar .pagelist li {
    display: inline-flex;
    margin: 0;
}

/* 响应式 - 平板 */
@media (max-width: 991px) {
    .z87b85section {
        padding: 3rem 0;
    }

    .z87b85hero-section {
        padding: 3rem 0 2.5rem;
    }

    .z87b85hero-visual {
        margin-top: 0.5rem;
    }

    .z87b85footer .row > [class*="col-"] {
        text-align: center;
    }

    .z87b85friend-links {
        justify-content: center;
    }
}

/* 响应式 - 手机 */
@media (max-width: 767px) {
    .z87b85navbar {
        padding: 0.5rem 0;
    }

    .z87b85navbar-brand img {
        height: 36px;
    }

    .z87b85nav-link {
        padding: 0.5rem 0.35rem !important;
        font-size: 0.9rem;
    }

    .z87b85section {
        padding: 2.5rem 0;
    }

    .z87b85section-head {
        margin-bottom: 1.75rem;
    }

    .z87b85hero-section {
        padding: 2.5rem 0 2rem;
    }

    .z87b85hero-buttons {
        flex-direction: column;
    }

    .z87b85hero-buttons .z87b85btn {
        width: 100%;
    }

    .z87b85hero-image {
        max-width: 220px;
    }

    .z87b85feature-card {
        padding: 1.25rem;
    }

    .z87b85download-card {
        padding: 1.15rem;
    }

    .z87b85download-card-head {
        flex-direction: row;
        align-items: center;
    }

    .z87b85download-card-head h3 {
        font-size: 0.95rem;
    }

    .z87b85knowledge-item {
        flex-direction: column;
        gap: 0.5rem;
        padding: 1rem;
    }

    .z87b85stat-item {
        min-height: 76px;
        padding: 0.75rem 0.35rem;
    }

    .z87b85security-card {
        padding: 1rem 0.75rem;
    }

    .z87b85security-card h3 {
        font-size: 0.88rem;
    }

    .z87b85security-card p {
        font-size: 0.78rem;
    }

    .z87b85thumb-home {
        height: 90px;
    }

    .z87b85thumb-list,
    .z87b85thumb-related {
        height: 72px !important;
    }

    .z87b85thumb-side {
        height: 50px !important;
    }

    .z87b85thumb-cover {
        max-width: 100% !important;
        width: 100%;
        height: 170px !important;
    }

    .listbox .e2 li {
        padding-bottom: 0.75rem !important;
        margin-bottom: 0.75rem !important;
    }

    .listbox .e2 li h2.h5 {
        font-size: 1rem;
        line-height: 1.35;
    }

    #article .z87b85article-card .card-body,
    .z87b85article-card .card-body {
        padding: 0.6rem;
    }

    .z87b85article-card h3,
    .z87b85article-card .h6 {
        font-size: 0.85rem;
        line-height: 1.35;
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
    }
}

@media (max-width: 575px) {
    .container {
        padding-left: 14px;
        padding-right: 14px;
    }

    .z87b85thumb-home {
        height: 80px;
    }

    .z87b85thumb-list,
    .z87b85thumb-related {
        height: 64px !important;
    }

    .z87b85thumb-cover {
        height: 150px !important;
    }

    .pagebar .pagelist {
        gap: 0.35rem;
    }
}

/* Bootstrap 覆盖 */
.btn-primary {
    background: var(--primary-color);
    border-color: var(--primary-color);
}

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

.btn-outline-primary {
    color: var(--primary-color);
    border-color: var(--primary-color);
}

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

.card {
    overflow: hidden;
}