:root {
    --primary: #0d5c63;
    --primary-dark: #09464c;
    --accent: #e07a5f;
    --accent-hover: #c96a52;
    --surface: #f4f1de;
    --surface-alt: #ffffff;
    --text: #2b2d42;
    --text-muted: #5c6370;
    --border: rgba(13, 92, 99, 0.12);
    --radius: 12px;
    --radius-lg: 20px;
    --shadow: 0 8px 24px rgba(13, 92, 99, 0.08);
    --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', system-ui, sans-serif;
    color: var(--text);
    line-height: 1.65;
    background: var(--surface);
    margin: 0;
    overflow-x: hidden;
}

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

a {
    color: var(--primary);
}

/* 固定导航 */
.zf3b5anavbar {
    background: rgba(255, 255, 255, 0.96);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    padding: 0.65rem 0;
    box-shadow: 0 2px 12px rgba(13, 92, 99, 0.06);
}

.zf3b5anavbar-brand img {
    height: 40px;
    width: auto;
}

.zf3b5anav-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);
}

.zf3b5anav-link:hover,
.zf3b5anav-link.active {
    color: var(--primary) !important;
    background: rgba(13, 92, 99, 0.08);
}

.zf3b5amain {
    padding-top: var(--nav-h);
}

/* 英雄区 */
.zf3b5ahero-section {
    background: linear-gradient(145deg, var(--primary-dark) 0%, var(--primary) 55%, #1a7a84 100%);
    color: #fff;
    padding: 4rem 0 4.5rem;
    position: relative;
    overflow: hidden;
}

.zf3b5ahero-section::after {
    content: '';
    position: absolute;
    right: -10%;
    top: -20%;
    width: 50%;
    height: 140%;
    background: radial-gradient(circle, rgba(224, 122, 95, 0.25) 0%, transparent 70%);
    pointer-events: none;
}

.zf3b5ahero-content {
    position: relative;
    z-index: 1;
}

.zf3b5ahero-badge {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.25);
    padding: 0.35rem 0.85rem;
    border-radius: 999px;
    margin-bottom: 1rem;
}

.zf3b5ahero-title {
    font-size: clamp(1.75rem, 4vw, 2.65rem);
    font-weight: 700;
    line-height: 1.25;
    margin-bottom: 1rem;
}

.zf3b5ahero-subtitle {
    font-size: 1.05rem;
    opacity: 0.92;
    margin-bottom: 1.5rem;
    max-width: 36em;
}

.zf3b5ahero-note {
    font-size: 0.85rem;
    opacity: 0.75;
    margin: 1rem 0 0;
}

.zf3b5ahero-visual {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.zf3b5ahero-image {
    max-width: 320px;
    width: 100%;
    margin: 0 auto;
    filter: drop-shadow(0 16px 32px rgba(0, 0, 0, 0.2));
}

.zf3b5ahero-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.zf3b5abtn {
    padding: 0.7rem 1.35rem;
    border-radius: 10px;
    font-weight: 600;
    font-size: 0.95rem;
    border: none;
    transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    white-space: normal;
}

.zf3b5abtn-accent {
    background: var(--accent);
    color: #fff;
}

.zf3b5abtn-accent:hover {
    background: var(--accent-hover);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(224, 122, 95, 0.35);
}

.zf3b5abtn-outline-light {
    background: transparent;
    color: #fff;
    border: 2px solid rgba(255, 255, 255, 0.6);
}

.zf3b5abtn-outline-light:hover {
    background: rgba(255, 255, 255, 0.12);
    color: #fff;
    border-color: #fff;
}

.zf3b5abtn-primary {
    background: var(--primary);
    color: #fff;
}

.zf3b5abtn-primary:hover {
    background: var(--primary-dark);
    color: #fff;
}

.zf3b5abtn-outline {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
}

.zf3b5abtn-outline:hover {
    background: var(--primary);
    color: #fff;
}

/* 通用区块 */
.zf3b5asection {
    padding: 4rem 0;
}

.zf3b5asection-head {
    text-align: center;
    max-width: 640px;
    margin: 0 auto 2.5rem;
}

.zf3b5asection-head-left {
    text-align: left;
    margin-left: 0;
    margin-right: 0;
    max-width: none;
}

.zf3b5asection-label {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 0.5rem;
}

.zf3b5asection-head h2 {
    font-size: clamp(1.4rem, 3vw, 1.85rem);
    font-weight: 700;
    color: var(--primary-dark);
    margin-bottom: 0.75rem;
}

.zf3b5asection-head p {
    color: var(--text-muted);
    margin: 0;
}

/* 特点卡片 */
.zf3b5afeatures-section {
    background: var(--surface-alt);
}

.zf3b5afeature-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    height: 100%;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.zf3b5afeature-card:hover {
    border-color: rgba(13, 92, 99, 0.25);
    box-shadow: var(--shadow);
}

.zf3b5afeature-card h3 {
    font-size: 1.1rem;
    color: var(--primary-dark);
    margin-bottom: 0.5rem;
}

.zf3b5afeature-card p {
    font-size: 0.95rem;
    color: var(--text-muted);
    margin: 0;
}

.zf3b5afeature-icon {
    width: 48px;
    height: 48px;
    border-radius: 10px;
    background: rgba(13, 92, 99, 0.1);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

/* 统计条 */
.zf3b5astats-section {
    padding: 2.5rem 0;
    background: var(--primary-dark);
}

.zf3b5astats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
}

.zf3b5astat-item {
    text-align: center;
    padding: 1rem 0.5rem;
    border-right: 1px solid rgba(255, 255, 255, 0.15);
}

.zf3b5astat-item:last-child {
    border-right: none;
}

.zf3b5astat-number {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 700;
    color: #fff;
    line-height: 1.2;
}

.zf3b5astat-label {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.8);
    margin-top: 0.25rem;
}

/* 下载区 */
.zf3b5adownload-section {
    background: var(--surface);
}

.zf3b5adownload-subtitle {
    color: var(--text-muted);
}

.zf3b5adownload-card {
    background: var(--surface-alt);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.zf3b5adownload-card-head {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.25rem;
}

.zf3b5adownload-card-head h3 {
    font-size: 1.15rem;
    margin: 0 0 0.15rem;
    color: var(--primary-dark);
}

.zf3b5adownload-card-head p {
    margin: 0;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.zf3b5aplatform-icon {
    flex-shrink: 0;
    width: 52px;
    height: 52px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    color: #fff;
}

.zf3b5aandroid-icon {
    background: linear-gradient(135deg, #3ddc84, #2a9d5c);
}

.zf3b5aios-icon {
    background: linear-gradient(135deg, #4a90d9, #2563b8);
}

.zf3b5adownload-info {
    list-style: none;
    padding: 0;
    margin: 0 0 1.25rem;
    flex-grow: 1;
}

.zf3b5adownload-info li {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.zf3b5adownload-info li i {
    color: var(--primary);
    margin-top: 0.2rem;
}

.zf3b5adownload-action {
    margin-top: auto;
}

/* 知识区 */
.zf3b5aknowledge-section {
    background: var(--surface-alt);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.zf3b5aknowledge-panel {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.zf3b5aknowledge-item {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
    padding: 1rem 1.15rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    border-left: 4px solid var(--accent);
}

.zf3b5aknowledge-item strong {
    flex-shrink: 0;
    font-size: 1.1rem;
    color: var(--accent);
    line-height: 1.4;
}

.zf3b5aknowledge-item h4 {
    font-size: 0.95rem;
    margin: 0 0 0.25rem;
    color: var(--primary-dark);
}

.zf3b5aknowledge-item p {
    font-size: 0.88rem;
    color: var(--text-muted);
    margin: 0;
}

/* 安全区 */
.zf3b5asecurity-section {
    background: var(--surface);
}

.zf3b5asecurity-subtitle {
    color: var(--text-muted);
}

.zf3b5asecurity-card {
    background: var(--surface-alt);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
    height: 100%;
    text-align: center;
}

.zf3b5asecurity-icon {
    width: 52px;
    height: 52px;
    margin: 0 auto 0.75rem;
    border-radius: 50%;
    background: rgba(13, 92, 99, 0.1);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
}

.zf3b5asecurity-card h3 {
    font-size: 1rem;
    color: var(--primary-dark);
    margin-bottom: 0.75rem;
}

.zf3b5asecurity-features {
    text-align: left;
}

.zf3b5afeature-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 0.4rem;
}

.zf3b5afeature-item i {
    color: var(--primary);
    font-size: 0.8rem;
}

/* FAQ */
.zf3b5afaq-section {
    background: var(--surface-alt);
}

.zf3b5afaq-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem 1.35rem;
    height: 100%;
}

.zf3b5afaq-card h5 {
    font-size: 1rem;
    color: var(--primary-dark);
    margin-bottom: 0.5rem;
}

.zf3b5afaq-card p {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin: 0;
}

/* 文章区 */
.zf3b5aarticle-section {
    background: var(--surface);
}

.zf3b5aarticle-card {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: none;
    transition: box-shadow var(--transition);
}

.zf3b5aarticle-card:hover {
    box-shadow: var(--shadow);
}

.zf3b5athumb-home {
    width: 100%;
    height: 110px;
    object-fit: cover;
}

.zf3b5aarticle-card .card-body {
    padding: 0.85rem;
}

.zf3b5aarticle-card h3 a {
    color: var(--text);
}

.zf3b5aarticle-card h3 a:hover {
    color: var(--primary);
}

/* 页脚 */
.zf3b5afooter {
    background: var(--primary-dark);
    color: rgba(255, 255, 255, 0.85);
    padding: 3rem 0 1.5rem;
}

.zf3b5afooter-title {
    color: #fff;
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.zf3b5afooter-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.zf3b5afooter-links li {
    margin-bottom: 0.5rem;
}

.zf3b5afooter-link {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: 0.9rem;
}

.zf3b5afooter-link:hover {
    color: var(--accent);
}

.zf3b5afriend-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem 1rem;
    list-style: none;
    padding: 0;
    margin: 0;
}

.zf3b5afriend-links a {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.85rem;
    text-decoration: none;
}

.zf3b5afriend-links a:hover {
    color: var(--accent);
}

.zf3b5afooter-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.12);
    padding-top: 1.25rem;
    margin-top: 1.5rem;
}

.zf3b5afooter-bottom a {
    color: rgba(255, 255, 255, 0.75);
}

.zf3b5afooter-bottom a:hover {
    color: var(--accent);
}

/* 列表页 / 内页 */
.zf3b5apage-wrap {
    padding-top: calc(var(--nav-h) + 1.5rem);
    padding-bottom: 3rem;
}

.zf3b5apage-card {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    background: var(--surface-alt);
}

.zf3b5apage-card .card-body {
    padding: 1.25rem;
}

.zf3b5aarticle-content {
    overflow-wrap: break-word;
    word-break: break-word;
}

.zf3b5aarticle-content img {
    max-width: 100%;
    height: auto;
}

.zf3b5athumb-list,
.zf3b5athumb-related {
    width: 100%;
    height: 84px;
    object-fit: cover;
    border-radius: 8px;
}

.zf3b5athumb-side {
    width: 100%;
    height: 54px;
    object-fit: cover;
    border-radius: 6px;
}

.zf3b5athumb-cover {
    max-width: 100%;
    width: 100%;
    height: auto;
    max-height: 280px;
    object-fit: cover;
    border-radius: var(--radius);
}

.zf3b5asidebar-card {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface-alt);
    margin-bottom: 1rem;
    overflow: hidden;
}

.zf3b5asidebar-card .card-body {
    padding: 1.15rem;
}

.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;
}

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

.navbar-collapse {
    background: var(--surface-alt);
    padding: 0.75rem;
    border-radius: var(--radius);
    margin-top: 0.5rem;
    border: 1px solid var(--border);
}

@media (min-width: 992px) {
    .navbar-collapse {
        background: transparent;
        padding: 0;
        border: none;
        margin-top: 0;
    }
}

.card {
    border-color: var(--border);
}

/* 响应式 */
@media (max-width: 991px) {
    .zf3b5astats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .zf3b5astat-item:nth-child(2) {
        border-right: none;
    }

    .zf3b5astat-item {
        border-right: none;
        border-bottom: 1px solid rgba(255, 255, 255, 0.12);
        padding: 1rem;
    }

    .zf3b5astat-item:nth-last-child(-n+2) {
        border-bottom: none;
    }
}

@media (max-width: 767px) {
    :root {
        --nav-h: 64px;
    }

    .zf3b5ahero-section {
        padding: 2.5rem 0 3rem;
    }

    .zf3b5ahero-buttons {
        flex-direction: column;
    }

    .zf3b5ahero-buttons .zf3b5abtn {
        width: 100%;
    }

    .zf3b5asection {
        padding: 2.75rem 0;
    }

    .zf3b5asection-head {
        margin-bottom: 1.75rem;
    }

    .zf3b5adownload-card {
        padding: 1.15rem;
    }

    .zf3b5adownload-card-head {
        flex-wrap: wrap;
    }

    .zf3b5aknowledge-item {
        flex-direction: column;
        gap: 0.5rem;
    }

    .zf3b5anavbar .navbar-collapse {
        max-height: 70vh;
        overflow-y: auto;
    }

    .zf3b5anav-link {
        padding: 0.5rem 0.35rem !important;
    }

    .zf3b5athumb-home {
        height: 96px;
    }

    .zf3b5athumb-list,
    .zf3b5athumb-related {
        height: 72px;
    }

    .zf3b5athumb-side {
        height: 50px;
    }

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

    #article .zf3b5aarticle-card .card-body {
        padding: 0.75rem;
    }

    #article h3.h6 {
        font-size: 0.9rem;
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
    }
}

@media (max-width: 575px) {
    .zf3b5astats-grid {
        grid-template-columns: 1fr 1fr;
        gap: 0.5rem;
    }

    .zf3b5astat-number {
        font-size: 1.35rem;
    }

    .zf3b5afooter .row > [class*='col-'] {
        text-align: center;
    }

    .zf3b5afriend-links {
        justify-content: center;
    }

    .zf3b5athumb-home {
        height: 88px;
    }

    .zf3b5athumb-list,
    .zf3b5athumb-related {
        height: 64px;
    }
}

/* 兼容旧类名 */
.zf3b5acontainer { max-width: 1140px; margin: 0 auto; padding-left: 15px; padding-right: 15px; }
.zf3b5atext-center { text-align: center; }
.zf3b5amb-4 { margin-bottom: 1.5rem; }
.zf3b5amb-0 { margin-bottom: 0; }
.zf3b5amt-3 { margin-top: 1rem; }
.zf3b5amt-4 { margin-top: 1.5rem; }
.zf3b5apy-5 { padding-top: 3rem; padding-bottom: 3rem; }

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