:root {
    --primary-color: #059669;
    --primary-light: #10B981;
    --secondary-color: #064E3B;
    --accent-color: #7C3AED;
    --accent-light: #A78BFA;
    --text-color: #1E293B;
    --text-muted: #64748B;
    --light-bg: #F0FDF4;
    --surface: #FFFFFF;
    --dark-bg: #0F172A;
    --gray-100: #F8FAFC;
    --gray-200: #E2E8F0;
    --gray-300: #CBD5E1;
    --gray-400: #94A3B8;
    --gray-500: #64748B;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1E293B;
    --gray-900: #0F172A;
    --transition-speed: 0.3s;
    --transition-easing: cubic-bezier(0.4, 0, 0.2, 1);
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 16px;
    --section-padding: 72px;
    --card-padding: 1.5rem;
    --card-border: 1px solid var(--gray-200);
    --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06);
    --shadow-md: 0 4px 20px rgba(15, 23, 42, 0.08);
    --shadow-lg: 0 12px 40px rgba(15, 23, 42, 0.12);
}

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--text-color);
    line-height: 1.7;
    background: var(--surface);
    overflow-x: clip;
}

/* 卡片列等高 */
.zf4b52about-section .d-flex > .zf4b52about-card,
.zf4b52download-section .d-flex > .zf4b52download-card,
.zf4b52security-section .d-flex > .zf4b52security-card,
.zf4b52security-certificates .d-flex > .zf4b52certificate-card {
    flex: 1;
    width: 100%;
    min-width: 0;
}

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

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

/* ===== 通用组件 ===== */
.zf4b52section-header {
    max-width: 720px;
    margin: 0 auto 2.5rem;
}

.zf4b52section-header h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 0.75rem;
    line-height: 1.3;
}

.zf4b52section-tag {
    display: inline-block;
    padding: 0.35rem 1rem;
    background: rgba(5, 150, 105, 0.1);
    color: var(--primary-color);
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    border-radius: 50px;
    margin-bottom: 1rem;
}

.zf4b52section-tag-light {
    background: rgba(255, 255, 255, 0.15);
    color: #A7F3D0;
}

.zf4b52section-desc {
    color: var(--text-muted);
    font-size: 1.05rem;
    margin-bottom: 0;
    line-height: 1.8;
}

/* ===== 导航栏 ===== */
.zf4b52navbar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    box-shadow: var(--shadow-sm);
    padding: 0.75rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.zf4b52navbar-brand img {
    height: 45px;
}

.zf4b52nav-link {
    color: var(--gray-700) !important;
    font-weight: 500;
    padding: 0.5rem 0.85rem !important;
    transition: color var(--transition-speed) ease;
    font-size: 0.95rem;
}

.zf4b52nav-link:hover {
    color: var(--primary-color) !important;
}

/* ===== 英雄区域 ===== */
.zf4b52hero-section {
    position: relative;
    color: white;
    padding: var(--section-padding) 0;
    overflow: hidden;
    background: var(--dark-bg);
}

.zf4b52hero-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 80% 60% at 20% 40%, rgba(5, 150, 105, 0.35) 0%, transparent 60%),
        radial-gradient(ellipse 60% 50% at 80% 20%, rgba(124, 58, 237, 0.25) 0%, transparent 55%),
        linear-gradient(160deg, #0F172A 0%, #064E3B 50%, #0F172A 100%);
}

.zf4b52hero-content {
    position: relative;
    z-index: 2;
}

.zf4b52hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 50px;
    font-size: 0.875rem;
    margin-bottom: 1.5rem;
    backdrop-filter: blur(8px);
}

.zf4b52hero-title {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 1.25rem;
    line-height: 1.15;
    letter-spacing: -0.02em;
}

.zf4b52hero-subtitle {
    font-size: 1.1rem;
    margin-bottom: 1.75rem;
    opacity: 0.88;
    line-height: 1.8;
    max-width: 100%;
}

.zf4b52hero-subtitle strong {
    color: #A7F3D0;
    font-weight: 600;
}

.zf4b52hero-highlights {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 2rem;
}

.zf4b52hero-highlight {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
    flex: 1 1 auto;
    min-width: 0;
}

.zf4b52hero-highlight i {
    color: var(--primary-light);
}

.zf4b52hero-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.zf4b52hero-buttons .zf4b52btn-hero {
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    transition: all var(--transition-speed) var(--transition-easing);
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.zf4b52hero-buttons .btn-light {
    background: white;
    color: var(--primary-color);
    border: none;
}

.zf4b52hero-buttons .btn-light:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
    background: white;
    color: var(--secondary-color);
}

.zf4b52hero-buttons .btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    border: none;
}

.zf4b52hero-buttons .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(5, 150, 105, 0.4);
    background: linear-gradient(135deg, var(--primary-light), var(--primary-color));
}

.zf4b52hero-buttons .btn-outline-light {
    border: 1.5px solid rgba(255, 255, 255, 0.4);
    color: white;
    background: transparent;
}

.zf4b52hero-buttons .btn-outline-light:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: white;
    color: white;
    transform: translateY(-2px);
}

/* 英雄视觉区 */
.zf4b52hero-visual {
    position: relative;
    z-index: 2;
    padding: 1rem 1.5rem;
    max-width: 100%;
    overflow: hidden;
}

.zf4b52hero-image-container {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem 2rem;
}

.zf4b52hero-image {
    width: 100%;
    max-width: 320px;
    height: auto;
    border-radius: var(--radius-lg);
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
    object-fit: contain;
    margin: 0 auto;
}

.zf4b52hero-float-card {
    position: absolute;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.85rem 1.15rem;
    background: rgba(255, 255, 255, 0.95);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    color: var(--gray-800);
    font-size: 0.875rem;
    animation: floatCard 4s ease-in-out infinite;
}

.zf4b52hero-float-card i {
    font-size: 1.25rem;
    color: var(--primary-color);
}

.zf4b52hero-float-card strong {
    display: block;
    font-size: 0.85rem;
    line-height: 1.3;
}

.zf4b52hero-float-card small {
    color: var(--text-muted);
    font-size: 0.75rem;
}

.zf4b52hero-float-1 {
    top: 8%;
    right: 5%;
    max-width: calc(100% - 1rem);
    animation-delay: 0s;
}

.zf4b52hero-float-2 {
    bottom: 12%;
    left: 5%;
    max-width: calc(100% - 1rem);
    animation-delay: 2s;
}

@keyframes floatCard {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

/* ===== 平台介绍 ===== */
.zf4b52about-section {
    padding: var(--section-padding) 0;
    background: var(--surface);
}

.zf4b52about-card {
    background: var(--surface);
    border: var(--card-border);
    border-radius: var(--radius-md);
    padding: var(--card-padding);
    height: 100%;
    transition: all var(--transition-speed) var(--transition-easing);
    display: flex;
    flex-direction: column;
}

.zf4b52about-card:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.zf4b52about-card-featured {
    background: linear-gradient(145deg, #ECFDF5 0%, #F5F3FF 100%);
    border-color: rgba(5, 150, 105, 0.2);
}

.zf4b52about-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    margin-bottom: 1.25rem;
}

.zf4b52about-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--gray-900);
}

.zf4b52about-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 1rem;
    line-height: 1.75;
}

.zf4b52about-list {
    list-style: none;
    padding: 0;
    margin: 0;
    margin-top: auto;
}

.zf4b52about-list li {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    padding: 0.35rem 0;
    font-size: 0.9rem;
    color: var(--gray-700);
    line-height: 1.5;
}

.zf4b52about-list li i {
    color: var(--primary-color);
    font-size: 1rem;
}

/* ===== 特点 Bento 网格 ===== */
.zf4b52features-section {
    padding: var(--section-padding) 0;
    background: var(--light-bg);
}

.zf4b52bento-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.25rem;
    align-items: stretch;
}

.zf4b52bento-item {
    background: var(--surface);
    border: var(--card-border);
    border-radius: var(--radius-md);
    padding: var(--card-padding);
    transition: all var(--transition-speed) var(--transition-easing);
    min-width: 0;
}

.zf4b52bento-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
    border-color: rgba(5, 150, 105, 0.3);
}

.zf4b52bento-large {
    grid-column: 1;
    grid-row: 1 / span 2;
    display: flex;
    flex-direction: column;
    justify-content: center;
    background: linear-gradient(145deg, var(--dark-bg) 0%, var(--secondary-color) 100%);
    color: white;
    border: none;
}

.zf4b52bento-item:nth-child(2) { grid-column: 2; grid-row: 1; }
.zf4b52bento-item:nth-child(3) { grid-column: 3; grid-row: 1; }
.zf4b52bento-item:nth-child(4) { grid-column: 2; grid-row: 2; }
.zf4b52bento-item:nth-child(5) { grid-column: 3; grid-row: 2; }

.zf4b52bento-large h3,
.zf4b52bento-large p {
    color: white;
}

.zf4b52bento-large .zf4b52bento-icon {
    background: rgba(255, 255, 255, 0.15);
    color: #A7F3D0;
}

.zf4b52bento-wide {
    grid-column: 1 / -1;
    grid-row: 3;
}

.zf4b52bento-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-sm);
    background: rgba(5, 150, 105, 0.1);
    color: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.zf4b52bento-item h3 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--gray-900);
}

.zf4b52bento-item p {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 0;
    line-height: 1.7;
}

/* ===== 注册流程 ===== */
.zf4b52register-section {
    padding: var(--section-padding) 0;
    background: var(--surface);
}

.zf4b52register-title {
    font-size: 2rem;
    font-weight: 700;
    margin: 0.75rem 0 1rem;
    color: var(--gray-900);
}

.zf4b52register-desc {
    color: var(--text-muted);
    font-size: 1.05rem;
    line-height: 1.8;
    margin-bottom: 1.75rem;
}

.zf4b52steps-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.25rem;
    align-items: stretch;
}

.zf4b52step-card {
    background: var(--gray-100);
    border: var(--card-border);
    border-radius: var(--radius-md);
    padding: var(--card-padding);
    position: relative;
    transition: all var(--transition-speed) ease;
    min-width: 0;
}

.zf4b52step-card:hover {
    background: var(--light-bg);
    border-color: var(--primary-light);
    transform: translateX(4px);
}

.zf4b52step-num {
    display: inline-block;
    font-size: 2rem;
    font-weight: 800;
    color: rgba(5, 150, 105, 0.2);
    line-height: 1;
    margin-bottom: 0.5rem;
}

.zf4b52step-card h4 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--gray-900);
}

.zf4b52step-card p {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 0;
    line-height: 1.65;
}

/* ===== 统计数据 ===== */
.zf4b52stats-section {
    padding: var(--section-padding) 0;
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--dark-bg) 100%);
    color: white;
    position: relative;
    overflow: hidden;
}

.zf4b52stats-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 70% 50%, rgba(124, 58, 237, 0.15) 0%, transparent 50%);
}

.zf4b52stats-section .zf4b52container {
    position: relative;
    z-index: 1;
}

.zf4b52stats-section h2 {
    color: white;
}

.zf4b52stat-item {
    text-align: center;
    padding: 1.25rem 1rem;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    transition: all var(--transition-speed) ease;
    height: 100%;
    min-width: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.zf4b52stat-item:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-3px);
}

.zf4b52stat-icon {
    font-size: 1.75rem;
    color: #A7F3D0;
    margin-bottom: 0.75rem;
}

.zf4b52stat-number {
    font-size: 2.25rem;
    font-weight: 800;
    margin-bottom: 0.35rem;
    letter-spacing: -0.02em;
}

.zf4b52stat-label {
    font-size: 0.95rem;
    opacity: 0.85;
}

.zf4b52stats-section .row > [class*="col"] {
    display: flex;
}

.zf4b52stats-section .zf4b52stat-item {
    width: 100%;
}

/* ===== 下载区域 ===== */
.zf4b52download-section {
    padding: var(--section-padding) 0;
    background: var(--gray-100);
}

.zf4b52download-cards-row {
    padding-top: 0.5rem;
}

.zf4b52download-card {
    background: var(--surface);
    border: var(--card-border);
    border-radius: var(--radius-md);
    padding: var(--card-padding);
    height: 100%;
    transition: all var(--transition-speed) var(--transition-easing);
    position: relative;
    display: flex;
    flex-direction: column;
    min-width: 0;
    overflow: visible;
}

.zf4b52download-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-5px);
    border-color: rgba(5, 150, 105, 0.25);
}

.zf4b52download-card-featured {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
}

.zf4b52download-badge {
    position: absolute;
    top: -10px;
    right: 20px;
    background: linear-gradient(135deg, var(--accent-color), var(--accent-light));
    color: white;
    font-size: 0.75rem;
    font-weight: 700;
    padding: 0.3rem 0.85rem;
    border-radius: 50px;
}

.zf4b52download-card-top {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.25rem;
    min-width: 0;
}

.zf4b52download-card-meta {
    flex: 1;
    min-width: 0;
}

.zf4b52download-card-top h3 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
    color: var(--gray-900);
    word-break: break-word;
}

.zf4b52download-platform-desc {
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-bottom: 0;
}

.zf4b52platform-icon {
    width: 52px;
    height: 52px;
    min-width: 52px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    color: white;
}

.zf4b52ios-icon {
    background: linear-gradient(135deg, #0078D4, #005A9E);
}

.zf4b52android-icon {
    background: linear-gradient(135deg, #3DDC84, #2BB673);
}

.zf4b52apple-icon {
    background: linear-gradient(135deg, #555555, #1D1D1F);
}

.zf4b52download-info {
    background: var(--light-bg);
    padding: 1rem 1.15rem;
    border-radius: var(--radius-sm);
    flex: 1 1 auto;
    margin-bottom: 1.25rem;
}

.zf4b52info-item {
    display: flex;
    align-items: flex-start;
    gap: 0.65rem;
    margin-bottom: 0.65rem;
    font-size: 0.9rem;
}

.zf4b52info-item:last-child {
    margin-bottom: 0;
}

.zf4b52info-item i {
    color: var(--primary-color);
    margin-top: 0.15rem;
    flex-shrink: 0;
}

.zf4b52info-item span {
    color: var(--gray-700);
    line-height: 1.5;
}

.zf4b52download-action {
    margin-top: auto;
}

.zf4b52download-action .btn {
    padding: 0.75rem 1.25rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
}

/* 下载提示区 */
.zf4b52download-tips {
    background: var(--surface);
    border: var(--card-border);
    border-radius: var(--radius-md);
    padding: var(--card-padding);
    overflow: hidden;
}

.zf4b52qr-image {
    max-width: 140px;
    margin: 0 auto;
}

.zf4b52qr-caption {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.zf4b52tips-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 1.25rem;
}

.zf4b52tips-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.zf4b52guide-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1rem 1.15rem;
    background: var(--light-bg);
    border-radius: var(--radius-sm);
    transition: all var(--transition-speed) ease;
    min-width: 0;
}

.zf4b52guide-content {
    flex: 1;
    min-width: 0;
}

.zf4b52guide-item:hover {
    background: rgba(5, 150, 105, 0.08);
}

.zf4b52guide-item i {
    font-size: 1.25rem;
    color: var(--primary-color);
    margin-top: 0.15rem;
    flex-shrink: 0;
}

.zf4b52guide-content h4 {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 0.35rem;
}

.zf4b52guide-content p {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 0;
    line-height: 1.65;
}

/* ===== 安全保障 ===== */
.zf4b52security-section {
    padding: var(--section-padding) 0;
    background: var(--surface);
}

.zf4b52security-card {
    background: var(--surface);
    border: var(--card-border);
    border-radius: var(--radius-md);
    padding: var(--card-padding);
    height: 100%;
    width: 100%;
    transition: all var(--transition-speed) ease;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.zf4b52security-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
    border-color: rgba(5, 150, 105, 0.25);
}

.zf4b52security-icon {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    margin: 0 auto 1.25rem;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: white;
}

.zf4b52security-card h3 {
    font-size: 1.05rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 1.25rem;
    color: var(--gray-900);
}

.zf4b52security-features {
    background: var(--light-bg);
    padding: 1rem 1.15rem;
    border-radius: var(--radius-sm);
    flex: 1;
}

.zf4b52feature-item {
    display: flex;
    align-items: flex-start;
    gap: 0.6rem;
    margin-bottom: 0.6rem;
    font-size: 0.875rem;
}

.zf4b52feature-item:last-child {
    margin-bottom: 0;
}

.zf4b52feature-item i {
    color: var(--primary-color);
    margin-top: 0.15rem;
    flex-shrink: 0;
}

.zf4b52feature-item span {
    color: var(--gray-700);
    line-height: 1.5;
}

.zf4b52security-certificates {
    margin-top: 3.5rem;
}

.zf4b52certificate-card {
    background: var(--gray-100);
    border: var(--card-border);
    border-radius: var(--radius-md);
    padding: var(--card-padding);
    text-align: center;
    height: 100%;
    width: 100%;
    transition: all var(--transition-speed) ease;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.zf4b52certificate-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
    border-color: var(--primary-light);
}

.zf4b52certificate-icon {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin: 0 auto 1.25rem;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
}

.zf4b52certificate-card h4 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 0.5rem;
}

.zf4b52certificate-card p {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 0;
    line-height: 1.65;
    flex: 1;
}

/* ===== FAQ ===== */
.zf4b52faq-section {
    padding: var(--section-padding) 0;
    background: var(--light-bg);
}

.zf4b52faq-accordion {
    --bs-accordion-border-width: 0;
    --bs-accordion-border-radius: var(--radius-md);
    --bs-accordion-inner-border-radius: var(--radius-md);
}

.zf4b52faq-accordion .accordion-item {
    border: var(--card-border) !important;
    border-radius: var(--radius-md) !important;
    margin-bottom: 0.75rem;
    overflow: hidden;
    background: var(--surface);
}

.zf4b52faq-accordion .accordion-button {
    font-weight: 600;
    font-size: 0.975rem;
    color: var(--gray-900);
    padding: 1rem 1.25rem;
    background: var(--surface);
    box-shadow: none;
    line-height: 1.5;
    word-break: break-word;
}

.zf4b52faq-accordion .accordion-button:not(.collapsed) {
    background: var(--light-bg);
    color: var(--primary-color);
}

.zf4b52faq-accordion .accordion-button:focus {
    box-shadow: none;
    border-color: transparent;
}

.zf4b52faq-accordion .accordion-button::after {
    background-size: 1rem;
}

.zf4b52faq-accordion .accordion-body {
    padding: 0 1.5rem 1.25rem;
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.8;
}

/* ===== 文章板块 ===== */
.zf4b52article-section {
    padding: var(--section-padding) 0;
    background: var(--surface);
}

.zf4b52article-card {
    border: var(--card-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: all var(--transition-speed) ease;
    box-shadow: none;
    margin-bottom: 0;
}

.zf4b52article-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
    border-color: rgba(5, 150, 105, 0.2);
}

.zf4b52article-link {
    color: var(--gray-900);
    transition: color var(--transition-speed) ease;
}

.zf4b52article-link:hover {
    color: var(--primary-color);
}

.zf4b52thumb-home {
    width: 100%;
    height: 160px;
    object-fit: cover;
}

/* ===== 按钮通用 ===== */
.btn {
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    transition: all var(--transition-speed) ease;
    position: relative;
    white-space: normal;
    text-align: center;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    border: none;
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-light), var(--primary-color));
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(5, 150, 105, 0.35);
}

.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);
}

.btn:active {
    transform: scale(0.98);
}

/* 兼容旧版特点卡片 */
.zf4b52feature-card {
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-speed) var(--transition-easing);
    border: 1px solid var(--gray-200);
    height: 100%;
    background: white;
}

.zf4b52feature-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-md);
}

.zf4b52feature-icon {
    font-size: 2.5rem;
    color: var(--primary-color);
    background: rgba(5, 150, 105, 0.1);
    width: 72px;
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    margin: 0 auto 1.25rem;
}

/* ===== 页脚 ===== */
.zf4b52footer {
    background: var(--dark-bg);
    padding: 60px 0 30px;
    color: var(--gray-400);
}

.zf4b52footer-brand img {
    max-width: 100%;
    height: auto;
}

.zf4b52footer-title {
    color: white;
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1.25rem;
}

.zf4b52footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.zf4b52footer-links li {
    margin-bottom: 0.6rem;
}

.zf4b52footer-link {
    color: var(--gray-400);
    text-decoration: none;
    transition: color var(--transition-speed) ease;
    font-size: 0.9rem;
}

.zf4b52footer-link:hover {
    color: var(--primary-light);
}

.zf4b52footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding-top: 1.5rem;
    color: var(--gray-500);
    font-size: 0.875rem;
}

.zf4b52footer-bottom a {
    color: var(--gray-400);
    text-decoration: none;
}

.zf4b52footer-bottom a:hover {
    color: var(--primary-light);
}

.zf4b52friend-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem 1.5rem;
    list-style: none;
    padding: 0;
    margin: 0;
}

.zf4b52friend-links a {
    color: var(--gray-400);
    text-decoration: none;
    font-size: 0.875rem;
}

.zf4b52friend-links a:hover {
    color: var(--primary-light);
}

/* ===== 表单 ===== */
input, select, textarea {
    transition: border-color var(--transition-speed) var(--transition-easing);
}

input:focus, select:focus, textarea:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(5, 150, 105, 0.2);
}

.form-control {
    width: 100%;
}

/* ===== 导航折叠 ===== */
.navbar-toggler {
    border: none;
    padding: 0.5rem;
}

.navbar-collapse {
    background: white;
    padding: 1rem;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-md);
}

/* ===== 列表/内容页兼容 ===== */
.table-responsive {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

#article .card {
    margin-bottom: 0;
}

.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: 1199px) {
    .zf4b52hero-title {
        font-size: 2.5rem;
    }

    .zf4b52bento-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .zf4b52bento-large,
    .zf4b52bento-item:nth-child(n) {
        grid-column: auto;
        grid-row: auto;
    }

    .zf4b52bento-wide {
        grid-column: 1 / -1;
    }
}

@media (max-width: 991px) {
    .zf4b52hero-title {
        font-size: 2.25rem;
    }

    .zf4b52hero-float-card {
        display: none;
    }

    .zf4b52hero-section,
    .zf4b52about-section,
    .zf4b52features-section,
    .zf4b52register-section,
    .zf4b52stats-section,
    .zf4b52download-section,
    .zf4b52security-section,
    .zf4b52faq-section,
    .zf4b52article-section {
        padding: 56px 0;
    }

    .zf4b52section-header {
        margin-bottom: 2rem;
    }

    .zf4b52section-header h2 {
        font-size: 1.75rem;
    }

    .zf4b52bento-grid {
        grid-template-columns: 1fr;
    }

    .zf4b52bento-large,
    .zf4b52bento-wide,
    .zf4b52bento-item:nth-child(n) {
        grid-column: auto;
        grid-row: auto;
    }

    .zf4b52steps-grid {
        grid-template-columns: 1fr;
    }

    .zf4b52footer {
        text-align: center;
    }

    .zf4b52footer-title {
        margin-top: 1.5rem;
    }

    .zf4b52friend-links {
        justify-content: center;
    }
}

@media (max-width: 767px) {
    .container,
    .zf4b52container {
        padding-left: 16px;
        padding-right: 16px;
    }

    .zf4b52hero-section {
        padding: 40px 0 48px;
    }

    .zf4b52about-section,
    .zf4b52features-section,
    .zf4b52register-section,
    .zf4b52stats-section,
    .zf4b52download-section,
    .zf4b52security-section,
    .zf4b52faq-section,
    .zf4b52article-section {
        padding: 48px 0;
    }

    .zf4b52section-header {
        margin-bottom: 1.75rem;
    }

    .zf4b52section-header h2 {
        font-size: 1.5rem;
    }

    .zf4b52section-desc {
        font-size: 0.95rem;
        line-height: 1.75;
    }

    .zf4b52hero-title {
        font-size: 1.75rem;
        margin-bottom: 1rem;
    }

    .zf4b52hero-subtitle {
        font-size: 0.925rem;
        line-height: 1.75;
        margin-bottom: 1.25rem;
    }

    .zf4b52hero-badge {
        font-size: 0.8rem;
        padding: 0.4rem 0.85rem;
        margin-bottom: 1rem;
        max-width: 100%;
        line-height: 1.4;
    }

    .zf4b52hero-highlights {
        display: grid;
        grid-template-columns: 1fr;
        gap: 0.5rem;
        margin-bottom: 1.5rem;
    }

    .zf4b52hero-highlight {
        width: 100%;
        flex: none;
    }

    .zf4b52hero-buttons {
        flex-direction: column;
        gap: 0.65rem;
    }

    .zf4b52hero-buttons .zf4b52btn-hero {
        width: 100%;
        padding: 0.7rem 1rem;
        font-size: 0.95rem;
    }

    .zf4b52hero-visual {
        padding: 0.5rem 0 0;
        margin-top: 0.5rem;
    }

    .zf4b52hero-image-container {
        padding: 0.5rem 0 1rem;
    }

    .zf4b52hero-image {
        max-width: 240px;
    }

    .zf4b52navbar {
        padding: 0.5rem 0;
    }

    .zf4b52navbar-brand img {
        height: 38px;
    }

    .zf4b52navbar .navbar-collapse {
        margin-top: 0.5rem;
        max-height: 70vh;
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
    }

    .zf4b52navbar .navbar-nav {
        width: 100%;
    }

    .zf4b52navbar .navbar-nav .nav-item {
        border-bottom: 1px solid var(--gray-200);
    }

    .zf4b52navbar .navbar-nav .nav-item:last-child {
        border-bottom: none;
    }

    .zf4b52navbar .navbar-nav .nav-link {
        padding: 0.75rem 0.5rem !important;
        font-size: 0.95rem;
        min-height: 44px;
        display: flex;
        align-items: center;
    }

    .zf4b52register-title {
        font-size: 1.5rem;
    }

    .zf4b52register-desc {
        font-size: 0.95rem;
        margin-bottom: 1.25rem;
    }

    .zf4b52stat-icon {
        font-size: 1.35rem;
        margin-bottom: 0.5rem;
    }

    .zf4b52stat-number {
        font-size: 1.6rem;
    }

    .zf4b52stat-label {
        font-size: 0.78rem;
        line-height: 1.35;
    }

    .zf4b52download-cards-row {
        padding-top: 0.75rem;
        --bs-gutter-y: 1rem;
    }

    .zf4b52download-card {
        padding: 1.25rem;
    }

    .zf4b52download-card-top {
        flex-direction: row;
        align-items: flex-start;
        text-align: left;
        gap: 0.85rem;
        margin-bottom: 1rem;
    }

    .zf4b52download-card-top h3 {
        font-size: 1rem;
    }

    .zf4b52download-info {
        padding: 0.85rem 1rem;
        margin-bottom: 1rem;
    }

    .zf4b52download-tips {
        padding: 1.25rem;
    }

    .zf4b52download-tips .row {
        row-gap: 1.25rem;
    }

    .zf4b52guide-item {
        padding: 0.85rem 1rem;
    }

    .zf4b52faq-accordion .accordion-button {
        font-size: 0.9rem;
        padding: 0.875rem 2.25rem 0.875rem 1rem;
    }

    .zf4b52faq-accordion .accordion-body {
        padding: 0 1rem 1rem;
        font-size: 0.9rem;
        line-height: 1.75;
    }

    .zf4b52security-certificates {
        margin-top: 2.5rem;
    }

    .zf4b52footer {
        padding: 48px 0 24px;
    }

    .zf4b52footer-title {
        margin-top: 1.25rem;
        margin-bottom: 1rem;
    }

    .zf4b52footer-bottom p {
        line-height: 1.8;
        word-break: break-word;
    }

    .zf4b52thumb-home {
        height: 180px;
    }

    #article .card-body {
        padding: 0.875rem;
    }

    #article h3.h5 {
        font-size: 0.95rem;
        line-height: 1.45;
        margin-bottom: 0;
        display: -webkit-box;
        -webkit-line-clamp: 2;
        line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
    }

    .zf4b52about-card:hover,
    .zf4b52bento-item:hover,
    .zf4b52step-card:hover,
    .zf4b52download-card:hover,
    .zf4b52security-card:hover,
    .zf4b52certificate-card:hover,
    .zf4b52stat-item:hover,
    .zf4b52article-card:hover {
        transform: none;
    }

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

    .listbox .e2 li h2.h5 {
        font-size: 1rem;
        margin-bottom: 0.35rem;
        line-height: 1.35;
    }

    .listbox .e2 li p {
        font-size: 0.9rem;
        line-height: 1.5;
    }

    .zf4b52thumb-list,
    .zf4b52thumb-related {
        height: 72px !important;
    }

    .zf4b52thumb-side {
        height: 50px !important;
    }

    .zf4b52thumb-cover {
        max-width: 100% !important;
        width: 100%;
        height: 170px !important;
        margin: 0 auto;
    }

    footer {
        padding: 40px 0 20px;
    }
}

@media (max-width: 575px) {
    .zf4b52hero-title {
        font-size: 1.55rem;
    }

    .zf4b52hero-subtitle {
        font-size: 0.875rem;
    }

    .zf4b52section-header h2 {
        font-size: 1.35rem;
    }

    .zf4b52hero-image {
        max-width: 200px;
    }

    .zf4b52stat-item {
        padding: 0.85rem 0.5rem;
    }

    .zf4b52about-card,
    .zf4b52bento-item,
    .zf4b52step-card,
    .zf4b52download-card,
    .zf4b52security-card,
    .zf4b52certificate-card {
        padding: 1.15rem;
    }

    .zf4b52stat-number {
        font-size: 1.35rem;
    }

    .zf4b52stat-label {
        font-size: 0.72rem;
    }

    .zf4b52stats-section .row {
        --bs-gutter-x: 0.65rem;
        --bs-gutter-y: 0.65rem;
    }

    .zf4b52step-num {
        font-size: 1.5rem;
    }

    .zf4b52platform-icon {
        width: 46px;
        height: 46px;
        min-width: 46px;
        font-size: 1.2rem;
    }

    .zf4b52thumb-home {
        height: 200px;
    }

    .zf4b52thumb-list,
    .zf4b52thumb-related {
        height: 64px !important;
    }

    .zf4b52thumb-side {
        height: 46px !important;
    }

    .zf4b52thumb-cover {
        height: 150px !important;
    }

    .pagebar .pagelist {
        gap: 0.35rem;
    }

    .modal-dialog {
        margin: 0.5rem;
    }
}

@media (min-width: 768px) and (max-width: 991px) {
    .zf4b52thumb-home {
        height: 140px;
    }
}

@media (min-width: 992px) {
    .zf4b52thumb-home {
        height: 120px;
    }
}

@media (min-width: 1200px) {
    .container {
        max-width: 1140px;
    }

    .zf4b52thumb-home {
        height: 120px;
    }
}

@media (min-width: 992px) and (max-width: 1199px) {
    .container {
        max-width: 960px;
    }
}