:root {
    --primary: #0f766e;
    --primary-dark: #115e59;
    --primary-light: #14b8a6;
    --accent: #ea580c;
    --accent-soft: #ffedd5;
    --surface: #ffffff;
    --surface-alt: #f0fdfa;
    --surface-muted: #ecfdf5;
    --text: #134e4a;
    --text-muted: #5f7a78;
    --border: rgba(15, 118, 110, 0.12);
    --shadow: 0 4px 24px rgba(15, 118, 110, 0.08);
    --shadow-lg: 0 12px 40px rgba(15, 118, 110, 0.12);
    --radius: 12px;
    --radius-lg: 20px;
    --nav-h: 72px;
    --transition: 0.25s ease;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

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

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

a {
    color: var(--primary);
    text-decoration: none;
}

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

/* ========== 导航 ========== */
.zfb2b9navbar {
    position: sticky;
    top: 0;
    z-index: 1030;
    background: rgba(255, 255, 255, 0.96);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    padding: 0.65rem 0;
    box-shadow: none;
}

.zfb2b9navbar-brand img {
    height: 42px;
    width: auto;
}

.zfb2b9nav-link {
    color: var(--text) !important;
    font-weight: 500;
    font-size: 0.95rem;
    padding: 0.45rem 0.85rem !important;
    border-radius: 8px;
    transition: color var(--transition), background var(--transition);
}

.zfb2b9nav-link:hover {
    color: var(--primary) !important;
    background: var(--surface-muted);
}

.navbar-toggler {
    border: 1px solid var(--border);
    padding: 0.4rem 0.55rem;
}

.navbar-toggler:focus {
    box-shadow: 0 0 0 2px rgba(20, 184, 166, 0.35);
}

/* ========== 首页 Hero ========== */
.zfb2b9hero-section {
    background: linear-gradient(145deg, var(--primary-dark) 0%, var(--primary) 45%, #0d9488 100%);
    color: #fff;
    padding: clamp(3rem, 8vw, 5.5rem) 0;
    position: relative;
    overflow: hidden;
}

.zfb2b9hero-section::after {
    content: "";
    position: absolute;
    right: -10%;
    top: -20%;
    width: 50%;
    max-width: 480px;
    aspect-ratio: 1;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.08) 0%, transparent 70%);
    pointer-events: none;
}

.zfb2b9hero-content {
    position: relative;
    z-index: 1;
}

.zfb2b9hero-badge {
    display: inline-block;
    padding: 0.35rem 0.9rem;
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.25);
    border-radius: 999px;
    font-size: 0.85rem;
    margin-bottom: 1rem;
    letter-spacing: 0.02em;
}

.zfb2b9hero-title {
    font-size: clamp(1.75rem, 4.5vw, 2.75rem);
    font-weight: 700;
    line-height: 1.25;
    margin-bottom: 1rem;
}

.zfb2b9hero-subtitle {
    font-size: clamp(0.95rem, 2vw, 1.1rem);
    opacity: 0.92;
    max-width: 540px;
    margin-bottom: 1.75rem;
}

.zfb2b9hero-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.zfb2b9hero-buttons .btn {
    border-radius: 10px;
    font-weight: 600;
    padding: 0.7rem 1.35rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    white-space: normal;
}

.zfb2b9hero-buttons .btn-light {
    background: #fff;
    color: var(--primary-dark);
    border: none;
}

.zfb2b9hero-buttons .btn-accent {
    background: var(--accent);
    color: #fff;
    border: none;
}

.zfb2b9hero-buttons .btn-outline-light {
    border: 1px solid rgba(255, 255, 255, 0.6);
    color: #fff;
}

.zfb2b9hero-buttons .btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
}

.zfb2b9hero-image-container {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.zfb2b9hero-image {
    max-width: min(320px, 90%);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    margin: 0 auto;
}

.zfb2b9hero-image-shadow {
    display: none;
}

/* ========== 通用区块 ========== */
.zfb2b9section {
    padding: clamp(2.5rem, 6vw, 4rem) 0;
}

.zfb2b9section-alt {
    background: var(--surface-alt);
}

.zfb2b9section-title {
    font-size: clamp(1.35rem, 3vw, 1.85rem);
    font-weight: 700;
    color: var(--primary-dark);
    margin-bottom: 0.5rem;
}

.zfb2b9section-lead {
    color: var(--text-muted);
    max-width: 640px;
    margin: 0 auto 2rem;
    font-size: 0.98rem;
}

.zfb2b9section-head {
    text-align: center;
    margin-bottom: 2rem;
}

/* ========== 特点卡片 ========== */
.zfb2b9feature-grid .col {
    margin-bottom: 1rem;
}

.zfb2b9feature-card {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    height: 100%;
    background: var(--surface);
    box-shadow: var(--shadow);
    transition: transform var(--transition), box-shadow var(--transition);
    overflow: hidden;
}

.zfb2b9feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.zfb2b9feature-icon {
    width: 52px;
    height: 52px;
    border-radius: 12px;
    background: var(--surface-muted);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.35rem;
    margin: 0 auto 1rem;
}

.zfb2b9feature-card h3 {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--primary-dark);
    margin-bottom: 0.5rem;
    text-align: center;
}

.zfb2b9feature-card p {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin: 0;
    text-align: center;
}

/* ========== 知识介绍 ========== */
.zfb2b9knowledge-wrap {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    align-items: start;
}

.zfb2b9knowledge-panel {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    background: var(--surface);
    height: 100%;
}

.zfb2b9knowledge-panel h3 {
    font-size: 1.1rem;
    color: var(--primary-dark);
    margin-bottom: 0.75rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--primary-light);
    display: inline-block;
}

.zfb2b9knowledge-panel p,
.zfb2b9knowledge-panel li {
    font-size: 0.92rem;
    color: var(--text-muted);
    margin-bottom: 0.65rem;
}

.zfb2b9knowledge-panel ul {
    padding-left: 1.1rem;
    margin: 0;
}

.zfb2b9knowledge-highlight {
    background: linear-gradient(135deg, var(--surface-muted), var(--accent-soft));
    border-color: rgba(234, 88, 12, 0.15);
}

/* ========== 统计 ========== */
.zfb2b9stats-section {
    background: var(--primary-dark);
    color: #fff;
    padding: clamp(2rem, 5vw, 3rem) 0;
}

.zfb2b9stat-item {
    text-align: center;
    padding: 0.75rem;
}

.zfb2b9stat-number {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    line-height: 1.2;
}

.zfb2b9stat-label {
    font-size: 0.9rem;
    opacity: 0.88;
    margin-top: 0.25rem;
}

/* ========== 下载 ========== */
.zfb2b9download-section {
    padding: clamp(2.5rem, 6vw, 4rem) 0;
    background: var(--surface-muted);
}

.zfb2b9download-card {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface);
    height: 100%;
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: box-shadow var(--transition);
}

.zfb2b9download-card:hover {
    box-shadow: var(--shadow-lg);
}

.zfb2b9download-card .card-body {
    padding: 1.35rem;
}

.zfb2b9platform-icon {
    width: 48px;
    height: 48px;
    min-width: 48px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    color: #fff;
    flex-shrink: 0;
}

.zfb2b9ios-icon {
    background: linear-gradient(135deg, #6366f1, #4f46e5);
}

.zfb2b9android-icon {
    background: linear-gradient(135deg, #22c55e, #16a34a);
}

.zfb2b9win-icon {
    background: linear-gradient(135deg, #0ea5e9, #0284c7);
}

.zfb2b9download-info {
    background: var(--surface-alt);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 1rem;
    margin-bottom: 1rem;
}

.zfb2b9info-item {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    font-size: 0.88rem;
    color: var(--text-muted);
}

.zfb2b9info-item:last-child {
    margin-bottom: 0;
}

.zfb2b9info-item i {
    color: var(--primary);
    margin-top: 0.15rem;
    flex-shrink: 0;
}

.zfb2b9download-action .btn,
.zfb2b9btn-primary {
    background: var(--primary);
    border: none;
    color: #fff;
    border-radius: 10px;
    font-weight: 600;
    padding: 0.65rem 1.25rem;
    width: 100%;
    white-space: normal;
}

.zfb2b9download-action .btn:hover,
.zfb2b9btn-primary:hover {
    background: var(--primary-dark);
    color: #fff;
}

.zfb2b9btn-outline {
    border: 1px solid var(--primary);
    color: var(--primary);
    border-radius: 10px;
    font-weight: 600;
}

.zfb2b9btn-outline:hover {
    background: var(--primary);
    color: #fff;
}

/* ========== 安全 ========== */
.zfb2b9security-section {
    padding: clamp(2.5rem, 6vw, 4rem) 0;
    background: var(--surface);
}

.zfb2b9security-card {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.35rem;
    height: 100%;
    background: var(--surface);
    box-shadow: var(--shadow);
    text-align: center;
    overflow: hidden;
}

.zfb2b9security-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 1rem;
    border-radius: 50%;
    background: var(--surface-muted);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
}

.zfb2b9security-card h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--primary-dark);
    margin-bottom: 0.75rem;
}

.zfb2b9security-features {
    text-align: left;
    background: var(--surface-alt);
    border-radius: 8px;
    padding: 0.85rem;
    border: 1px solid var(--border);
}

.zfb2b9feature-item {
    display: flex;
    align-items: flex-start;
    gap: 0.45rem;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 0.4rem;
}

.zfb2b9feature-item:last-child {
    margin-bottom: 0;
}

.zfb2b9feature-item i {
    color: var(--primary-light);
    flex-shrink: 0;
    margin-top: 0.1rem;
}

.zfb2b9certificate-card {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
    text-align: center;
    height: 100%;
    background: var(--surface-alt);
}

.zfb2b9certificate-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 0.75rem;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
}

.zfb2b9certificate-card h4 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--primary-dark);
    margin-bottom: 0.35rem;
}

.zfb2b9certificate-card p {
    font-size: 0.82rem;
    color: var(--text-muted);
    margin: 0;
}

/* ========== FAQ ========== */
.zfb2b9faq-section {
    background: var(--surface-alt);
}

.zfb2b9faq-card {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface);
    height: 100%;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.zfb2b9faq-card .card-body {
    padding: 1.15rem 1.25rem;
}

.zfb2b9faq-card .card-title {
    font-size: 0.98rem;
    font-weight: 600;
    color: var(--primary-dark);
    margin-bottom: 0.5rem;
}

.zfb2b9faq-card .card-text {
    font-size: 0.88rem;
    color: var(--text-muted);
    margin: 0;
}

/* ========== 文章区 ========== */
#article {
    background: var(--surface);
}

#article .card {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
}

#article .card-body {
    padding: 0.85rem;
}

.zfb2b9thumb-home {
    height: 110px;
    width: 100%;
    object-fit: cover;
}

#article h3.h5 {
    font-size: 0.92rem;
    line-height: 1.4;
    margin: 0;
}

#article h3.h5 a {
    color: var(--text);
}

#article h3.h5 a:hover {
    color: var(--primary);
}

/* ========== 页脚 ========== */
.zfb2b9footer {
    background: var(--primary-dark);
    color: rgba(255, 255, 255, 0.85);
    padding: clamp(2rem, 5vw, 3rem) 0 1.5rem;
}

.zfb2b9footer-title {
    color: #fff;
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.zfb2b9footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.zfb2b9footer-links li {
    margin-bottom: 0.5rem;
}

.zfb2b9footer-link {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
}

.zfb2b9footer-link:hover {
    color: var(--primary-light);
}

.zfb2b9footer p {
    font-size: 0.88rem;
    color: rgba(255, 255, 255, 0.65);
}

.zfb2b9friend-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem 1rem;
    list-style: none;
    padding: 0;
    margin: 0;
}

.zfb2b9friend-links a {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.85rem;
}

.zfb2b9footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.12);
    padding-top: 1.25rem;
    margin-top: 1.5rem;
    text-align: center;
    font-size: 0.85rem;
}

.zfb2b9footer-bottom a {
    color: rgba(255, 255, 255, 0.75);
}

/* ========== 列表/内页 ========== */
.zfb2b9page-main {
    padding: calc(var(--nav-h) + 1rem) 0 2.5rem;
    background: var(--surface-alt);
    min-height: 60vh;
}

.zfb2b9page-main .card {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}

.zfb2b9page-main .card-body {
    padding: 1.25rem;
}

.zfb2b9article-content {
    font-size: 1rem;
    line-height: 1.75;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.zfb2b9article-content img {
    max-width: 100%;
    height: auto;
}

.zfb2b9thumb-cover {
    max-width: 100%;
    width: 100%;
    height: auto;
    max-height: 280px;
    object-fit: cover;
    border-radius: var(--radius);
}

.zfb2b9thumb-list,
.zfb2b9thumb-related {
    width: 100%;
    height: 84px;
    object-fit: cover;
    border-radius: 8px;
}

.zfb2b9side-thumb-wrap {
    width: 72px;
    flex: 0 0 72px;
}

.zfb2b9thumb-side {
    width: 100%;
    height: 54px;
    object-fit: cover;
    border-radius: 6px;
}

.zfb2b9meta-tags .zfb2b9tagitem a {
    display: inline-block;
    padding: 0.25rem 0.65rem;
    background: var(--surface-muted);
    border-radius: 6px;
    font-size: 0.85rem;
}

.pagebar .pagelist {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    list-style: none;
    padding: 0;
    margin: 0;
}

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

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

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

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

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

.bg-light {
    background: var(--surface-alt) !important;
}

/* ========== 响应式 ========== */
@media (max-width: 991px) {
    .zfb2b9knowledge-wrap {
        grid-template-columns: 1fr;
    }

    .zfb2b9navbar .navbar-collapse {
        background: var(--surface);
        padding: 0.75rem;
        border-radius: var(--radius);
        border: 1px solid var(--border);
        margin-top: 0.5rem;
        max-height: 70vh;
        overflow-y: auto;
    }
}

@media (max-width: 767px) {
    .zfb2b9hero-section {
        padding: 2.5rem 0 2rem;
        text-align: center;
    }

    .zfb2b9hero-subtitle {
        margin-left: auto;
        margin-right: auto;
    }

    .zfb2b9hero-buttons {
        flex-direction: column;
    }

    .zfb2b9hero-buttons .btn {
        width: 100%;
    }

    .zfb2b9hero-image-container {
        margin-top: 1.5rem;
    }

    .zfb2b9download-card .d-flex.align-items-center {
        flex-wrap: wrap;
        gap: 0.75rem;
    }

    .zfb2b9download-card .d-flex.align-items-center .ms-3 {
        margin-left: 0 !important;
        flex: 1 1 100%;
    }

    .zfb2b9stat-item {
        margin-bottom: 0.5rem;
    }

    .zfb2b9footer .row > [class*="col-"] {
        text-align: center;
        margin-bottom: 1.25rem;
    }

    .zfb2b9friend-links {
        justify-content: center;
    }

    #article .row-cols-md-2 {
        --bs-gutter-y: 0.75rem;
    }

    .zfb2b9thumb-home {
        height: 96px;
    }

    #article h3.h5 {
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
    }

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

    .zfb2b9thumb-list,
    .zfb2b9thumb-related {
        height: 72px;
    }

    .zfb2b9page-main .card-body {
        padding: 1rem;
    }
}

@media (max-width: 575px) {
    .zfb2b9navbar-brand img {
        height: 36px;
    }

    .zfb2b9security-card,
    .zfb2b9feature-card,
    .zfb2b9knowledge-panel {
        padding: 1.1rem;
    }

    .zfb2b9download-card .card-body {
        padding: 1rem;
    }

    .zfb2b9thumb-home {
        height: 88px;
    }

    .zfb2b9thumb-list,
    .zfb2b9thumb-related {
        height: 64px;
    }
}