:root {
    --primary-color: #1a5f5f;
    --primary-dark: #0f3d3d;
    --secondary-color: #2d8a8a;
    --accent-color: #e76f51;
    --accent-hover: #d45a3d;
    --text-color: #2b2d42;
    --text-muted: #5c6378;
    --light-bg: #f4f7f6;
    --surface: #ffffff;
    --border-color: rgba(26, 95, 95, 0.12);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --shadow-sm: 0 2px 8px rgba(15, 61, 61, 0.06);
    --shadow-md: 0 8px 24px rgba(15, 61, 61, 0.1);
    --transition-speed: 0.25s;
    --transition-easing: cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

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

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

/* 导航 */
.zcb53enavbar {
    background: var(--surface);
    box-shadow: var(--shadow-sm);
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
}

.zcb53enavbar-brand img {
    height: 42px;
    max-height: 42px;
    width: auto;
}

.zcb53enav-link {
    color: var(--text-color) !important;
    font-weight: 500;
    padding: 0.45rem 0.85rem !important;
    font-size: 0.95rem;
    transition: color var(--transition-speed) ease;
    border-radius: var(--radius-sm);
}

.zcb53enav-link:hover {
    color: var(--primary-color) !important;
    background: rgba(26, 95, 95, 0.06);
}

/* 英雄区 */
.zcb53ehero-section {
    background: linear-gradient(145deg, var(--primary-dark) 0%, var(--primary-color) 45%, var(--secondary-color) 100%);
    color: #fff;
    padding: 4.5rem 0 4rem;
    position: relative;
    overflow: hidden;
}

.zcb53ehero-section::after {
    content: '';
    position: absolute;
    right: -10%;
    top: -20%;
    width: 50%;
    height: 140%;
    background: radial-gradient(ellipse, rgba(231, 111, 81, 0.15) 0%, transparent 70%);
    pointer-events: none;
}

.zcb53ehero-content {
    position: relative;
    z-index: 1;
}

.zcb53ehero-badge {
    display: inline-block;
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.25);
    padding: 0.35rem 0.85rem;
    border-radius: 50px;
    font-size: 0.8rem;
    margin-bottom: 1rem;
    letter-spacing: 0.02em;
}

.zcb53ehero-title {
    font-size: clamp(1.75rem, 4vw, 2.75rem);
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.25;
}

.zcb53ehero-subtitle {
    font-size: 1rem;
    margin-bottom: 1.5rem;
    opacity: 0.92;
    max-width: 36em;
}

.zcb53ehero-image-container {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    position: relative;
    z-index: 1;
}

.zcb53ehero-image {
    width: 100%;
    max-width: 280px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    object-fit: contain;
}

.zcb53ehero-image-shadow {
    display: none;
}

.zcb53ehero-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.zcb53ehero-buttons .btn {
    padding: 0.65rem 1.25rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.9rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    white-space: normal;
    border: none;
}

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

.btn-accent:hover {
    background: var(--accent-hover);
    color: #fff;
    transform: translateY(-1px);
}

.zcb53ehero-buttons .btn-light {
    background: #fff;
    color: var(--primary-dark);
}

.zcb53ehero-buttons .btn-outline-light {
    border: 1px solid rgba(255, 255, 255, 0.6);
    color: #fff;
    background: transparent;
}

.zcb53ehero-buttons .btn-outline-light:hover {
    background: rgba(255, 255, 255, 0.12);
    color: #fff;
}

/* 简介条 */
.zcb53eintro-strip {
    background: var(--surface);
    border-bottom: 1px solid var(--border-color);
    padding: 1.25rem 0;
}

.zcb53eintro-text {
    color: var(--text-muted);
    font-size: 0.95rem;
    text-align: center;
    max-width: 52em;
    margin: 0 auto;
    line-height: 1.7;
}

/* 区块标题 */
.zcb53esection-head {
    margin-bottom: 2.5rem;
}

.zcb53esection-head h2 {
    color: var(--primary-dark);
    font-weight: 700;
    font-size: clamp(1.5rem, 3vw, 2rem);
    margin-bottom: 0.5rem;
}

.zcb53esection-head p {
    color: var(--text-muted);
    margin: 0;
}

/* 特点区 */
.zcb53efeatures-section {
    padding: 4rem 0;
    background: var(--light-bg);
}

.zcb53efeature-card {
    background: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.75rem;
    height: 100%;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-speed) var(--transition-easing),
                box-shadow var(--transition-speed) var(--transition-easing);
    overflow: hidden;
}

.zcb53efeature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.zcb53efeature-card h3 {
    font-size: 1.15rem;
    color: var(--primary-dark);
    margin-bottom: 0.65rem;
    font-weight: 600;
}

.zcb53efeature-card p {
    color: var(--text-muted);
    font-size: 0.92rem;
    margin: 0;
}

.zcb53efeature-icon {
    width: 52px;
    height: 52px;
    border-radius: var(--radius-sm);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.35rem;
    margin-bottom: 1rem;
}

/* 统计 */
.zcb53estats-section {
    background: var(--primary-dark);
    color: #fff;
    padding: 2.5rem 0;
}

.zcb53estat-item {
    text-align: center;
    padding: 0.75rem 0.5rem;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.05);
    height: 100%;
}

.zcb53estat-number {
    font-size: clamp(1.5rem, 3vw, 2.25rem);
    font-weight: 700;
    margin-bottom: 0.25rem;
    color: var(--accent-color);
}

.zcb53estat-label {
    font-size: 0.88rem;
    opacity: 0.9;
}

/* 知识区 */
.zcb53eknowledge-section {
    padding: 4rem 0;
    background: var(--surface);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.zcb53eknowledge-title {
    color: var(--primary-dark);
    font-weight: 700;
    font-size: clamp(1.35rem, 2.5vw, 1.75rem);
    margin-bottom: 1rem;
}

.zcb53eknowledge-section p {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 0.85rem;
}

.zcb53eknowledge-list {
    list-style: none;
    padding: 1.25rem;
    margin: 0;
    background: var(--light-bg);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.zcb53eknowledge-list li {
    display: flex;
    align-items: flex-start;
    gap: 0.6rem;
    padding: 0.5rem 0;
    color: var(--text-color);
    font-size: 0.92rem;
}

.zcb53eknowledge-list li i {
    color: var(--accent-color);
    flex-shrink: 0;
    margin-top: 0.15rem;
}

/* 下载区 */
.zcb53edownload-section {
    padding: 4rem 0;
    background: linear-gradient(180deg, var(--light-bg) 0%, #e8efed 100%);
}

.zcb53edownload-header {
    max-width: 36em;
    margin: 0 auto 2.5rem;
}

.zcb53edownload-header h2 {
    color: var(--primary-dark);
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.zcb53edownload-subtitle {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin: 0;
}

.zcb53edownload-card {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    background: var(--surface);
    overflow: hidden;
    transition: box-shadow var(--transition-speed) ease;
}

.zcb53edownload-card:hover {
    box-shadow: var(--shadow-md);
}

.zcb53edownload-card .card-body {
    padding: 1.5rem;
}

.zcb53edl-head {
    gap: 1rem;
    margin-bottom: 1rem;
}

.zcb53edl-head h3 {
    font-size: 1.1rem;
    color: var(--primary-dark);
    font-weight: 600;
}

.zcb53eplatform-icon {
    width: 48px;
    height: 48px;
    min-width: 48px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    flex-shrink: 0;
}

.zcb53eios-icon {
    background: linear-gradient(135deg, #3a3a3c, #1c1c1e);
    color: #fff;
}

.zcb53eandroid-icon {
    background: linear-gradient(135deg, #3ddc84, #2a9d5c);
    color: #fff;
}

.zcb53epc-icon {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: #fff;
}

.zcb53edownload-info {
    background: var(--light-bg);
    padding: 1rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    margin-bottom: 1rem;
}

.zcb53einfo-item {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    font-size: 0.88rem;
    color: var(--text-muted);
}

.zcb53einfo-item:last-child {
    margin-bottom: 0;
}

.zcb53einfo-item i {
    color: var(--secondary-color);
    margin-top: 0.15rem;
    flex-shrink: 0;
}

.zcb53epc-card .card-body {
    padding: 1.25rem 1.5rem;
}

/* 安全区 */
.zcb53esecurity-section {
    padding: 4rem 0;
    background: var(--surface);
}

.zcb53esecurity-header {
    max-width: 36em;
    margin: 0 auto 2.5rem;
}

.zcb53esecurity-header h2 {
    color: var(--primary-dark);
    font-weight: 700;
}

.zcb53esecurity-subtitle {
    color: var(--text-muted);
    font-size: 0.95rem;
}

.zcb53esecurity-card {
    background: var(--light-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    height: 100%;
    text-align: center;
    transition: border-color var(--transition-speed) ease;
}

.zcb53esecurity-card:hover {
    border-color: var(--secondary-color);
}

.zcb53esecurity-icon {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.35rem;
    margin: 0 auto 1rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: #fff;
}

.zcb53esecurity-card h3 {
    color: var(--primary-dark);
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.zcb53esecurity-features {
    text-align: left;
    padding: 0.85rem;
    background: var(--surface);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
}

.zcb53esecurity-features .zcb53efeature-item {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 0.4rem;
}

.zcb53esecurity-features .zcb53efeature-item i {
    color: var(--accent-color);
    margin-right: 0.4rem;
}

/* FAQ */
.zcb53efaq-section {
    padding: 4rem 0;
    background: var(--light-bg);
}

.zcb53efaq-card {
    background: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.25rem 1.5rem;
    height: 100%;
    box-shadow: var(--shadow-sm);
}

.zcb53efaq-card h5 {
    color: var(--primary-dark);
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.zcb53efaq-card p {
    color: var(--text-muted);
    font-size: 0.88rem;
    margin: 0;
    line-height: 1.6;
}

/* 文章区 */
.zcb53earticle-section {
    padding: 4rem 0;
    background: var(--surface);
    border-top: 1px solid var(--border-color);
}

.zcb53earticle-section h2 {
    color: var(--primary-dark);
    font-weight: 700;
}

.zcb53earticle-card {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition-speed) ease;
}

.zcb53earticle-card:hover {
    box-shadow: var(--shadow-md);
}

.zcb53ethumb-home {
    height: 110px;
    width: 100%;
    object-fit: cover;
    display: block;
}

.zcb53earticle-card .card-body {
    padding: 0.85rem;
}

.zcb53earticle-link {
    color: var(--text-color);
    font-weight: 500;
}

.zcb53earticle-link:hover {
    color: var(--primary-color);
}

/* 按钮 */
.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);
}

.zcb53ebtn {
    border-radius: var(--radius-sm);
    font-weight: 600;
}

/* 页脚 */
.zcb53efooter {
    background: var(--primary-dark);
    color: rgba(255, 255, 255, 0.85);
    padding: 3rem 0 1.5rem;
}

.zcb53efooter-title {
    color: #fff;
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.zcb53efooter-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.zcb53efooter-links li {
    margin-bottom: 0.5rem;
}

.zcb53efooter-link {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: 0.88rem;
    transition: color 0.2s ease;
}

.zcb53efooter-link:hover {
    color: var(--accent-color);
}

.zcb53efooter p {
    color: rgba(255, 255, 255, 0.65);
    font-size: 0.88rem;
}

.zcb53efooter a {
    color: rgba(255, 255, 255, 0.85);
}

.zcb53efooter-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.12);
    padding-top: 1.25rem;
}

.zcb53efriend-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem 1rem;
    list-style: none;
    padding: 0;
    margin: 0;
}

.zcb53efriend-links a {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.85rem;
    text-decoration: none;
}

.zcb53efriend-links a:hover {
    color: var(--accent-color);
}

/* 列表/内页 */
.zcb53epage-header {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
    color: #fff;
    padding: 2rem 0;
    margin-bottom: 0;
}

.zcb53epage-header h1 {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
    font-weight: 700;
    margin-bottom: 0.35rem;
}

.zcb53epage-header p {
    opacity: 0.9;
    font-size: 0.92rem;
    margin: 0;
}

.zcb53econtent-section {
    padding: 2.5rem 0 3rem;
}

.zcb53econtent-section .card {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.zcb53econtent-section .card-body {
    padding: 1.25rem;
}

.zcb53esidebar-card {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    margin-bottom: 1.25rem;
    overflow: hidden;
}

.zcb53esidebar-card .card-body {
    padding: 1.15rem;
}

.zcb53esidebar-card h3 {
    color: var(--primary-dark);
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.85rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--accent-color);
    display: inline-block;
}

.zcb53earticle-content {
    line-height: 1.75;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.zcb53earticle-content img {
    max-width: 100%;
    height: auto;
}

.zcb53ethumb-cover {
    max-width: 100%;
    width: 100%;
    max-height: 220px;
    object-fit: cover;
    border-radius: var(--radius-sm);
}

.zcb53emeta-tags .zcb53etagitem a {
    display: inline-block;
    padding: 0.25rem 0.6rem;
    background: var(--light-bg);
    border-radius: 50px;
    font-size: 0.82rem;
    color: var(--primary-color);
    text-decoration: none;
    border: 1px solid var(--border-color);
}

/* 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 */
@media (max-width: 991px) {
    .zcb53ehero-section {
        padding: 3rem 0 2.5rem;
    }

    .zcb53ehero-image-container {
        margin-top: 0.5rem;
    }

    .zcb53enavbar .navbar-collapse {
        margin-top: 0.5rem;
        padding: 0.75rem;
        border-radius: var(--radius-md);
        border: 1px solid var(--border-color);
        background: var(--surface);
        max-height: 70vh;
        overflow-y: auto;
    }
}

@media (max-width: 767px) {
    .zcb53enavbar {
        padding: 0.5rem 0;
    }

    .zcb53enavbar-brand img {
        height: 36px;
    }

    .zcb53ehero-section {
        padding: 2.5rem 0 2rem;
    }

    .zcb53ehero-buttons {
        flex-direction: column;
    }

    .zcb53ehero-buttons .btn {
        width: 100%;
    }

    .zcb53efeatures-section,
    .zcb53eknowledge-section,
    .zcb53edownload-section,
    .zcb53esecurity-section,
    .zcb53efaq-section,
    .zcb53earticle-section {
        padding: 2.5rem 0;
    }

    .zcb53esection-head {
        margin-bottom: 1.75rem;
    }

    .zcb53efeature-card {
        padding: 1.25rem;
    }

    .zcb53edownload-card .card-body {
        padding: 1.15rem;
    }

    .zcb53edl-head {
        flex-direction: row;
        flex-wrap: nowrap;
    }

    .zcb53epc-card .card-body {
        flex-direction: column !important;
        align-items: stretch !important;
    }

    .zcb53epc-card .btn {
        width: 100%;
    }

    .zcb53estat-item {
        padding: 0.6rem 0.35rem;
    }

    .zcb53eknowledge-list {
        padding: 1rem;
    }

    .zcb53ethumb-home {
        height: 96px !important;
    }

    #article .zcb53earticle-card .card-body,
    .zcb53earticle-card .card-body {
        padding: 0.75rem;
    }

    .zcb53earticle-link,
    .zcb53earticle-card h3,
    .zcb53earticle-card h6 {
        font-size: 0.9rem;
        line-height: 1.4;
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
    }

    .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;
    }

    .zcb53ethumb-list,
    .zcb53ethumb-related {
        height: 72px !important;
    }

    .zcb53ethumb-side {
        height: 50px !important;
    }

    .zcb53ethumb-cover {
        max-width: 100% !important;
        width: 100%;
        height: auto !important;
        max-height: 200px;
        object-fit: cover;
    }

    .zcb53efooter .row > [class*="col-"] {
        text-align: center;
    }

    .zcb53efriend-links {
        justify-content: center;
    }
}

@media (max-width: 575px) {
    .zcb53eintro-text {
        font-size: 0.88rem;
        text-align: left;
    }

    .zcb53ethumb-home {
        height: 88px !important;
    }

    .zcb53ethumb-list,
    .zcb53ethumb-related {
        height: 64px !important;
    }

    .zcb53esecurity-card {
        padding: 1.15rem;
    }

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

/* 防止边框溢出 */
.zcb53econtainer {
    width: 100%;
}

.card,
.zcb53efeature-card,
.zcb53edownload-card,
.zcb53esecurity-card,
.zcb53efaq-card,
.zcb53earticle-card {
    max-width: 100%;
}

/* 移除旧动画冲突 */
.zcb53ehero-content,
.zcb53efeature-card,
.zcb53edownload-card {
    animation: none;
}

.btn {
    white-space: normal;
}

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