:root {
    --primary-color: #7C3AED;
    --primary-light: #A78BFA;
    --primary-dark: #5B21B6;
    --accent-color: #F59E0B;
    --accent-light: #FCD34D;
    --text-color: #1E293B;
    --text-muted: #64748B;
    --light-bg: #F8FAFC;
    --surface: #FFFFFF;
    --dark-bg: #1E1B4B;
    --dark-surface: #312E81;
    --gray-100: #F1F5F9;
    --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: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --card-padding: 1.5rem;
    --card-border: 1px solid var(--gray-200);
    --section-padding: 4rem;
    --shadow-sm: 0 1px 3px rgba(30, 27, 75, 0.06);
    --shadow-md: 0 4px 20px rgba(30, 27, 75, 0.08);
    --shadow-lg: 0 12px 40px rgba(30, 27, 75, 0.12);
    --shadow-glow: 0 0 40px rgba(124, 58, 237, 0.15);
}

* {
    box-sizing: border-box;
}

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: hidden;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 4.5rem;
    font-size: 16px;
}

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

.zc39b3container.container {
    width: 100%;
    max-width: 1140px;
    padding-left: 1rem;
    padding-right: 1rem;
}

.zc39b3row.row > [class*="col"] {
    min-width: 0;
}

/* 统一卡片基础样式 */
.zc39b3card-base {
    background: var(--surface);
    border: var(--card-border);
    border-radius: var(--radius-md);
    padding: var(--card-padding);
    height: 100%;
    width: 100%;
    box-sizing: border-box;
}

/* ===== 通用组件 ===== */
.zc39b3section-badge {
    display: inline-block;
    padding: 0.35rem 1rem;
    background: rgba(255, 255, 255, 0.15);
    color: var(--accent-light);
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    border-radius: 50px;
    margin-bottom: 1rem;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.zc39b3section-badge--light {
    background: rgba(124, 58, 237, 0.08);
    color: var(--primary-color);
    border-color: rgba(124, 58, 237, 0.15);
}

.zc39b3section-title {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--gray-900);
    line-height: 1.3;
    margin-bottom: 1rem;
}

.zc39b3section-title strong {
    color: var(--primary-color);
    font-weight: 700;
}

.zc39b3section-subtitle {
    font-size: 1.05rem;
    color: var(--text-muted);
    max-width: 640px;
    margin: 0 auto;
}

.zc39b3section-lead {
    font-size: 1.05rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.zc39b3section-text {
    font-size: 0.95rem;
    color: var(--gray-500);
}

.zc39b3section-header {
    margin-bottom: 2.5rem;
}

@media (max-width: 767px) {
    .zc39b3section-header {
        margin-bottom: 2rem;
    }
}

.zc39b3section-header--light .zc39b3section-title,
.zc39b3section-header--light .zc39b3section-subtitle {
    color: white;
}

.zc39b3section-header--light .zc39b3section-subtitle {
    opacity: 0.85;
}

/* ===== 导航栏 ===== */
.zc39b3navbar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: var(--shadow-sm);
    padding: 0.85rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.zc39b3navbar-brand img {
    height: 45px;
}

.zc39b3nav-link {
    color: var(--gray-700) !important;
    font-weight: 500;
    padding: 0.5rem 1rem !important;
    transition: color var(--transition-speed) var(--transition-easing);
    font-size: 0.95rem;
}

.zc39b3nav-link:hover {
    color: var(--primary-color) !important;
}

.navbar-toggler {
    border: none;
    padding: 0.5rem;
}

@media (min-width: 992px) {
    .zc39b3navbar .navbar-collapse {
        background: transparent;
        padding: 0;
        box-shadow: none;
    }
}

/* ===== 英雄区域 ===== */
.zc39b3hero-section {
    background: linear-gradient(135deg, var(--dark-bg) 0%, var(--primary-dark) 50%, #4C1D95 100%);
    color: white;
    padding: var(--section-padding) 0;
    position: relative;
    overflow: hidden;
}

.zc39b3hero-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 20% 50%, rgba(124, 58, 237, 0.3) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(245, 158, 11, 0.15) 0%, transparent 40%),
        radial-gradient(ellipse at 60% 80%, rgba(167, 139, 250, 0.2) 0%, transparent 45%);
    pointer-events: none;
}

.zc39b3hero-content {
    position: relative;
    z-index: 1;
}

.zc39b3hero-title {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 1.25rem;
    line-height: 1.15;
    letter-spacing: -0.02em;
}

.zc39b3hero-subtitle {
    font-size: 1.15rem;
    margin-bottom: 1rem;
    opacity: 0.92;
    line-height: 1.7;
}

.zc39b3hero-desc {
    font-size: 0.95rem;
    opacity: 0.8;
    line-height: 1.8;
    margin-bottom: 0;
}

.zc39b3hero-desc strong {
    color: var(--accent-light);
    font-weight: 600;
}

.zc39b3hero-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 2rem;
}

.zc39b3btn-hero {
    padding: 0.75rem 1.5rem !important;
    border-radius: var(--radius-md) !important;
    font-weight: 600 !important;
    font-size: 0.95rem !important;
    display: inline-flex !important;
    align-items: center;
    transition: all var(--transition-speed) var(--transition-easing);
}

.zc39b3hero-buttons .btn-light {
    background: white;
    color: var(--primary-dark);
    border: none;
}

.zc39b3hero-buttons .btn-light:hover {
    background: var(--accent-light);
    color: var(--dark-bg);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

.zc39b3hero-buttons .btn-primary {
    background: linear-gradient(135deg, var(--accent-color), #D97706);
    border: none;
    color: white;
}

.zc39b3hero-buttons .btn-primary:hover {
    background: linear-gradient(135deg, #D97706, var(--accent-color));
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(245, 158, 11, 0.35);
}

.zc39b3hero-buttons .btn-outline-light {
    border: 2px solid rgba(255, 255, 255, 0.4);
    color: white;
    background: transparent;
}

.zc39b3hero-buttons .btn-outline-light:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: white;
    transform: translateY(-2px);
}

.zc39b3hero-trust {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    margin-top: 2.5rem;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.zc39b3trust-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    opacity: 0.85;
}

.zc39b3trust-item i {
    color: var(--accent-color);
    font-size: 1.1rem;
}

.zc39b3hero-image-container {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2.5rem 1.5rem;
    max-width: 100%;
    overflow: hidden;
}

.zc39b3hero-image {
    width: 100%;
    max-width: 320px;
    height: auto;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    object-fit: contain;
    margin: 0 auto;
    position: relative;
    z-index: 2;
}

.zc39b3hero-image-shadow {
    display: none;
}

.zc39b3hero-card-float {
    position: absolute;
    top: 8%;
    left: 5%;
    max-width: calc(100% - 2rem);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(8px);
    padding: 0.75rem 1rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    gap: 0.65rem;
    z-index: 3;
    animation: floatCard 4s ease-in-out infinite;
}

.zc39b3hero-card-float--bottom {
    top: auto;
    left: auto;
    bottom: 12%;
    right: 5%;
    animation-delay: 2s;
}

.zc39b3hero-card-float i {
    font-size: 1.5rem;
    color: var(--primary-color);
}

.zc39b3hero-card-float strong {
    display: block;
    font-size: 0.85rem;
    color: var(--gray-900);
}

.zc39b3hero-card-float span {
    font-size: 0.75rem;
    color: var(--text-muted);
}

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

/* ===== 平台简介 ===== */
.zc39b3intro-section {
    padding: var(--section-padding) 0;
    background: var(--light-bg);
}

.zc39b3intro-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
}

.zc39b3intro-item {
    background: var(--surface);
    padding: var(--card-padding);
    border-radius: var(--radius-md);
    border: var(--card-border);
    height: 100%;
    transition: all var(--transition-speed) var(--transition-easing);
}

.zc39b3intro-item:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
}

.zc39b3intro-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, rgba(124, 58, 237, 0.1), rgba(167, 139, 250, 0.15));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
}

.zc39b3intro-icon i {
    font-size: 1.35rem;
    color: var(--primary-color);
}

.zc39b3intro-item h3 {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--gray-900);
}

.zc39b3intro-item p {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin: 0;
    line-height: 1.6;
}

/* ===== 特点区域 ===== */
.zc39b3features-section {
    padding: var(--section-padding) 0;
    background: var(--surface);
}

.zc39b3feature-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;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.zc39b3feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    opacity: 0;
    transition: opacity var(--transition-speed);
}

.zc39b3feature-card:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
}

.zc39b3feature-card:hover::before {
    opacity: 1;
}

.zc39b3feature-icon {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.25rem;
    font-size: 1.4rem;
    color: white;
}

.zc39b3feature-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--gray-900);
}

.zc39b3feature-card p {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin: 0;
    line-height: 1.7;
}

/* ===== 统计数据 ===== */
.zc39b3stats-section {
    background: linear-gradient(135deg, var(--dark-bg) 0%, var(--primary-dark) 100%);
    color: white;
    padding: var(--section-padding) 0;
    position: relative;
}

.zc39b3section-header--light .zc39b3section-title strong {
    color: var(--accent-light);
}

.zc39b3stat-item {
    text-align: center;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    padding: 1.5rem 0.75rem;
    height: 100%;
    transition: all var(--transition-speed) var(--transition-easing);
}

.zc39b3stat-item:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-3px);
}

.zc39b3stat-number {
    font-size: clamp(1.5rem, 4vw, 2.25rem);
    font-weight: 800;
    margin-bottom: 0.35rem;
    line-height: 1.2;
    word-break: keep-all;
    background: linear-gradient(135deg, white, var(--accent-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.zc39b3stat-label {
    font-size: 0.85rem;
    opacity: 0.8;
    line-height: 1.4;
}

/* ===== 注册指南 ===== */
.zc39b3register-section {
    padding: var(--section-padding) 0;
    background: var(--light-bg);
}

.zc39b3steps {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.zc39b3step {
    display: flex;
    gap: 1.25rem;
    background: var(--surface);
    padding: var(--card-padding);
    border-radius: var(--radius-md);
    border: var(--card-border);
    transition: all var(--transition-speed) var(--transition-easing);
}

.zc39b3step:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-md);
}

.zc39b3step-num {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.95rem;
}

.zc39b3step-body h4 {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 0.35rem;
    color: var(--gray-900);
}

.zc39b3step-body p {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin: 0;
}

/* ===== 下载区域 ===== */
.zc39b3download-section {
    padding: var(--section-padding) 0;
    background: var(--surface);
}

.zc39b3download-subtitle {
    color: var(--text-muted);
    font-size: 1.05rem;
    max-width: 680px;
    margin: 0 auto;
}

.zc39b3download-section .d-flex > .zc39b3download-card,
.zc39b3features-section .d-flex > .zc39b3feature-card,
.zc39b3security-section .d-flex > .zc39b3security-card,
.zc39b3security-section .d-flex > .zc39b3certificate-card {
    width: 100%;
}

.zc39b3download-card {
    background: var(--surface);
    border: var(--card-border);
    border-radius: var(--radius-md);
    padding: var(--card-padding);
    padding-top: 2.25rem;
    height: 100%;
    transition: all var(--transition-speed) var(--transition-easing);
    position: relative;
    display: flex;
    flex-direction: column;
    box-sizing: border-box;
}

.zc39b3download-card:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
}

.zc39b3download-card--featured {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 1px var(--primary-color), var(--shadow-sm);
}

.zc39b3download-badge {
    position: absolute;
    top: 0;
    right: 1rem;
    background: linear-gradient(135deg, var(--accent-color), #D97706);
    color: white;
    font-size: 0.7rem;
    font-weight: 600;
    padding: 0.25rem 0.75rem;
    border-radius: 0 0 var(--radius-sm) var(--radius-sm);
    line-height: 1.4;
}

.zc39b3download-card-top {
    display: flex;
    align-items: center;
    gap: 0.875rem;
    margin-bottom: 1.25rem;
    min-height: 52px;
}

.zc39b3download-card-top h3 {
    font-size: 1.05rem;
    font-weight: 600;
    margin: 0;
    color: var(--gray-900);
    line-height: 1.35;
    word-break: keep-all;
}

.zc39b3card-meta {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin: 0.15rem 0 0;
}

.zc39b3platform-icon {
    width: 52px;
    height: 52px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    flex-shrink: 0;
}

.zc39b3ios-icon {
    background: linear-gradient(135deg, #1C1C1E, #3A3A3C);
    color: white;
}

.zc39b3android-icon {
    background: linear-gradient(135deg, #3DDC84, #2BB673);
    color: white;
}

.zc39b3win-icon {
    background: linear-gradient(135deg, #0078D4, #005A9E);
    color: white;
}

.zc39b3download-info {
    background: var(--gray-100);
    padding: 1rem;
    border-radius: var(--radius-sm);
    margin-bottom: 1.25rem;
    flex: 1 1 auto;
}

.zc39b3info-item {
    display: flex;
    align-items: flex-start;
    margin-bottom: 0.65rem;
    font-size: 0.875rem;
}

.zc39b3info-item:last-child {
    margin-bottom: 0;
}

.zc39b3info-item i {
    color: var(--primary-color);
    margin-right: 0.65rem;
    margin-top: 0.15rem;
    font-size: 0.9rem;
    flex-shrink: 0;
}

.zc39b3info-item span {
    color: var(--gray-600);
}

.zc39b3download-action {
    margin-top: auto;
}

.zc39b3download-action .btn,
.zc39b3btn {
    padding: 0.7rem 1.5rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    transition: all var(--transition-speed) var(--transition-easing);
}

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

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(124, 58, 237, 0.3);
}

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

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

.zc39b3download-tip {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    margin-top: 2.5rem;
    padding: 1.25rem 1.5rem;
    background: rgba(124, 58, 237, 0.05);
    border: 1px solid rgba(124, 58, 237, 0.12);
    border-radius: var(--radius-md);
}

.zc39b3download-tip i {
    color: var(--primary-color);
    font-size: 1.2rem;
    flex-shrink: 0;
    margin-top: 0.1rem;
}

.zc39b3download-tip p {
    margin: 0;
    font-size: 0.9rem;
    color: var(--gray-600);
    line-height: 1.7;
}

/* ===== 安全保障 ===== */
.zc39b3security-section {
    padding: var(--section-padding) 0;
    background: var(--light-bg);
}

.zc39b3security-subtitle {
    color: var(--text-muted);
    font-size: 1.05rem;
}

.zc39b3security-card {
    background: var(--surface);
    border-radius: var(--radius-md);
    padding: var(--card-padding);
    height: 100%;
    border: var(--card-border);
    transition: all var(--transition-speed) var(--transition-easing);
    text-align: center;
    display: flex;
    flex-direction: column;
    box-sizing: border-box;
}

.zc39b3security-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
    border-color: var(--primary-light);
}

.zc39b3security-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-dark));
    color: white;
}

.zc39b3security-card h3 {
    color: var(--gray-900);
    font-weight: 600;
    font-size: 1.05rem;
    margin-bottom: 1.25rem;
}

.zc39b3security-features {
    background: var(--gray-100);
    padding: 1rem;
    border-radius: var(--radius-sm);
    text-align: left;
    flex: 1 1 auto;
}

.zc39b3feature-item {
    display: flex;
    align-items: center;
    margin-bottom: 0.6rem;
    font-size: 0.875rem;
}

.zc39b3feature-item:last-child {
    margin-bottom: 0;
}

.zc39b3feature-item i {
    color: var(--primary-color);
    margin-right: 0.6rem;
    font-size: 0.85rem;
}

.zc39b3feature-item span {
    color: var(--gray-600);
}

.zc39b3security-certificates {
    margin-top: 3.5rem;
}

.zc39b3certificate-card {
    background: var(--surface);
    border-radius: var(--radius-md);
    padding: var(--card-padding);
    text-align: center;
    border: var(--card-border);
    transition: all var(--transition-speed) var(--transition-easing);
    height: 100%;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.zc39b3certificate-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
}

.zc39b3certificate-icon {
    width: 72px;
    height: 72px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    margin: 0 auto 1.25rem;
    background: linear-gradient(135deg, var(--accent-color), #D97706);
    color: white;
}

.zc39b3certificate-card h4 {
    color: var(--gray-900);
    font-weight: 600;
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

.zc39b3certificate-card p {
    color: var(--text-muted);
    font-size: 0.875rem;
    margin: 0;
    line-height: 1.6;
}

/* ===== FAQ ===== */
.zc39b3faq-section {
    padding: var(--section-padding) 0;
    background: var(--surface);
}

.zc39b3accordion {
    --bs-accordion-border-width: 0;
    --bs-accordion-btn-focus-box-shadow: none;
}

.zc39b3accordion .accordion-item {
    border: var(--card-border);
    border-radius: var(--radius-md) !important;
    margin-bottom: 0.75rem;
    overflow: hidden;
    background: var(--surface);
}

.zc39b3accordion .accordion-button {
    font-weight: 600;
    font-size: 1rem;
    color: var(--gray-900);
    padding: 1.15rem 1.5rem;
    background: var(--surface);
}

.zc39b3accordion .accordion-button:not(.collapsed) {
    background: rgba(124, 58, 237, 0.05);
    color: var(--primary-color);
    box-shadow: none;
}

.zc39b3accordion .accordion-button:focus {
    box-shadow: none;
    border-color: var(--gray-200);
}

.zc39b3accordion .accordion-body {
    font-size: 0.925rem;
    color: var(--text-muted);
    line-height: 1.8;
    padding: 0 1.5rem 1.25rem;
}

/* ===== 文章板块 ===== */
.zc39b3article-section {
    padding: var(--section-padding) 0;
    background: var(--light-bg);
}

.zc39b3article-card {
    border: var(--card-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: all var(--transition-speed) var(--transition-easing);
    box-shadow: none;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.zc39b3article-card .card-body {
    padding: 0.875rem 1rem;
    flex: 1 1 auto;
    display: flex;
    flex-direction: column;
}

.zc39b3article-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
    border-color: var(--primary-light);
}

.zc39b3article-thumb {
    overflow: hidden;
}

.zc39b3thumb-home {
    height: 130px;
    object-fit: cover;
    width: 100%;
    transition: transform var(--transition-speed);
}

.zc39b3article-card:hover .zc39b3thumb-home {
    transform: scale(1.05);
}

.zc39b3article-meta {
    margin-bottom: 0.5rem;
}

.zc39b3article-title {
    line-height: 1.45;
    margin: 0;
}

.zc39b3article-title a {
    color: var(--gray-800);
    transition: color var(--transition-speed);
}

.zc39b3article-title a:hover {
    color: var(--primary-color);
}

.zc39b3btn-more {
    white-space: nowrap;
    flex-shrink: 0;
}

.zc39b3download-action .btn,
.zc39b3hero-buttons .btn {
    white-space: normal;
    text-align: center;
}

@media (max-width: 767px) {
    .zc39b3hero-buttons .btn-lg {
        --bs-btn-padding-y: 0.7rem;
        --bs-btn-padding-x: 1rem;
        --bs-btn-font-size: 0.9rem;
    }
}

/* ===== 页脚 ===== */
.zc39b3footer {
    background: var(--gray-900);
    padding: 4rem 0 2rem;
    color: var(--gray-400);
}

.zc39b3footer-brand img {
    max-width: 100%;
    height: auto;
    filter: brightness(1.1);
}

.zc39b3footer-desc {
    font-size: 0.9rem;
    line-height: 1.7;
    color: var(--gray-400);
}

.zc39b3footer-title {
    color: white;
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1.25rem;
}

.zc39b3footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.zc39b3footer-links li {
    margin-bottom: 0.6rem;
}

.zc39b3footer-link {
    color: var(--gray-400);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color var(--transition-speed);
}

.zc39b3footer-link:hover {
    color: var(--primary-light);
}

.zc39b3friend-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem 1.5rem;
    list-style: none;
    padding: 0;
    margin: 0;
}

.zc39b3friend-links a {
    color: var(--gray-400);
    text-decoration: none;
    font-size: 0.875rem;
    transition: color var(--transition-speed);
}

.zc39b3friend-links a:hover {
    color: var(--primary-light);
}

.zc39b3footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding-top: 1.5rem;
    color: var(--gray-500);
    font-size: 0.875rem;
}

.zc39b3footer-bottom a {
    color: var(--gray-400);
    text-decoration: none;
    transition: color var(--transition-speed);
}

.zc39b3footer-bottom a:hover {
    color: var(--primary-light);
}

/* ===== 按钮通用 ===== */
.btn {
    position: relative;
    overflow: hidden;
}

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

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(124, 58, 237, 0.2);
}

.card {
    margin-bottom: 0;
}

/* ===== 列表/内容页通用 ===== */
.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) {
    .zc39b3hero-title {
        font-size: 2.25rem;
    }

    .zc39b3section-title {
        font-size: 1.85rem;
    }

    .zc39b3hero-card-float {
        display: none;
    }

    .zc39b3intro-grid {
        grid-template-columns: 1fr;
    }

    .zc39b3hero-section .row.g-5,
    .zc39b3intro-section .row.g-5,
    .zc39b3register-section .row.g-5 {
        --bs-gutter-y: 2rem;
    }

    .zc39b3navbar .navbar-collapse {
        background: white;
        padding: 0.75rem 1rem;
        border-radius: var(--radius-md);
        box-shadow: var(--shadow-md);
        margin-top: 0.5rem;
        max-height: 70vh;
        overflow-y: auto;
    }

    .zc39b3footer {
        text-align: center;
    }

    .zc39b3footer-brand {
        display: inline-block;
    }

    .zc39b3footer-links {
        text-align: center;
    }

    .zc39b3friend-links {
        justify-content: center;
    }
}

@media (max-width: 767px) {
    :root {
        --card-padding: 1.15rem;
        --section-padding: 2.75rem;
    }

    .zc39b3hero-section {
        padding: 2.25rem 0 2.75rem;
    }

    .zc39b3hero-title {
        font-size: 1.75rem;
        margin-bottom: 0.875rem;
    }

    .zc39b3hero-subtitle {
        font-size: 0.95rem;
        margin-bottom: 0.75rem;
        line-height: 1.65;
    }

    .zc39b3hero-desc {
        font-size: 0.875rem;
        line-height: 1.75;
    }

    .zc39b3section-badge {
        font-size: 0.72rem;
        padding: 0.28rem 0.7rem;
        letter-spacing: 0.02em;
        margin-bottom: 0.75rem;
    }

    .zc39b3hero-buttons {
        flex-direction: column;
        margin-top: 1.25rem;
        gap: 0.625rem;
    }

    .zc39b3hero-buttons .btn,
    .zc39b3btn-hero {
        width: 100%;
        justify-content: center;
        padding: 0.7rem 1rem !important;
        font-size: 0.9rem !important;
    }

    .zc39b3hero-trust {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.625rem;
        margin-top: 1.25rem;
        padding-top: 1.125rem;
    }

    .zc39b3hero-image-container {
        padding: 0 0 0.5rem;
    }

    .zc39b3hero-image {
        max-width: 220px;
    }

    .zc39b3hero-section .row.g-5,
    .zc39b3intro-section .row.g-5,
    .zc39b3register-section .row.g-5 {
        --bs-gutter-y: 1.5rem;
    }

    .zc39b3section-title {
        font-size: 1.5rem;
        margin-bottom: 0.75rem;
    }

    .zc39b3section-lead,
    .zc39b3section-text,
    .zc39b3section-subtitle,
    .zc39b3download-subtitle,
    .zc39b3security-subtitle {
        font-size: 0.9rem;
        line-height: 1.65;
    }

    .zc39b3intro-section,
    .zc39b3features-section,
    .zc39b3stats-section,
    .zc39b3register-section,
    .zc39b3download-section,
    .zc39b3security-section,
    .zc39b3faq-section,
    .zc39b3article-section {
        padding: var(--section-padding) 0;
    }

    .zc39b3container.container {
        padding-left: 1rem;
        padding-right: 1rem;
    }

    .zc39b3stat-number {
        font-size: 1.65rem;
    }

    .zc39b3stat-label {
        font-size: 0.78rem;
    }

    .zc39b3stat-item {
        padding: 1rem 0.5rem;
    }

    .zc39b3stats-section .row.g-3 {
        --bs-gutter-x: 0.625rem;
        --bs-gutter-y: 0.625rem;
    }

    .zc39b3step {
        flex-direction: row;
        gap: 0.875rem;
        padding: 1rem;
    }

    .zc39b3step-num {
        width: 40px;
        height: 40px;
        font-size: 0.85rem;
    }

    .zc39b3step-body h4 {
        font-size: 0.95rem;
    }

    .zc39b3step-body p {
        font-size: 0.85rem;
    }

    .zc39b3download-card {
        padding: 1.15rem;
        padding-top: 1.85rem;
    }

    .zc39b3download-card-top {
        flex-direction: row;
        align-items: center;
        text-align: left;
        min-height: auto;
        gap: 0.75rem;
        margin-bottom: 1rem;
    }

    .zc39b3download-card-top h3 {
        font-size: 1rem;
    }

    .zc39b3platform-icon {
        width: 44px;
        height: 44px;
        font-size: 1.2rem;
    }

    .zc39b3download-info {
        padding: 0.875rem;
        margin-bottom: 1rem;
    }

    .zc39b3info-item {
        font-size: 0.82rem;
    }

    .zc39b3download-tip {
        flex-direction: column;
        gap: 0.5rem;
        padding: 1rem;
        margin-top: 1.5rem;
    }

    .zc39b3download-section .row.g-4 {
        --bs-gutter-y: 0.875rem;
    }

    .zc39b3security-icon {
        width: 52px;
        height: 52px;
        font-size: 1.25rem;
    }

    .zc39b3certificate-icon {
        width: 56px;
        height: 56px;
        font-size: 1.4rem;
    }

    .zc39b3feature-icon {
        width: 48px;
        height: 48px;
        font-size: 1.2rem;
        margin-bottom: 1rem;
    }

    .zc39b3feature-card h3 {
        font-size: 1rem;
    }

    .zc39b3feature-card p {
        font-size: 0.85rem;
    }

    .zc39b3features-section .row.g-4,
    .zc39b3security-section .row.g-4 {
        --bs-gutter-y: 0.875rem;
    }

    .zc39b3accordion .accordion-button {
        font-size: 0.9rem;
        padding: 0.875rem 2.75rem 0.875rem 1rem;
        line-height: 1.45;
        text-align: left;
    }

    .zc39b3accordion .accordion-body {
        font-size: 0.875rem;
        padding: 0 1rem 1rem;
    }

    .zc39b3article-header {
        flex-direction: column;
        align-items: stretch !important;
    }

    .zc39b3btn-more {
        width: 100%;
        text-align: center;
        justify-content: center;
        display: inline-flex;
        align-items: center;
    }

    .zc39b3thumb-home {
        height: 130px !important;
    }

    .zc39b3article-card .card-body {
        padding: 0.75rem 0.875rem;
    }

    .zc39b3article-meta {
        font-size: 0.75rem;
    }

    #article h3.h6,
    .zc39b3article-title {
        font-size: 0.875rem;
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
    }

    .zc39b3navbar {
        padding: 0.5rem 0;
    }

    .zc39b3navbar-brand img {
        height: 36px;
    }

    .zc39b3navbar .navbar-nav .nav-link {
        padding: 0.5rem 0.5rem !important;
        font-size: 0.925rem;
    }

    .zc39b3footer {
        padding: 2.25rem 0 1.25rem;
    }

    .zc39b3footer-title {
        font-size: 0.95rem;
        margin-bottom: 0.875rem;
        margin-top: 0.25rem;
    }

    .zc39b3footer-desc {
        font-size: 0.85rem;
    }

    .zc39b3footer-bottom {
        font-size: 0.8rem;
        line-height: 1.65;
    }

    .zc39b3footer-bottom p:first-child {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: 0.35rem 0.65rem;
    }

    .zc39b3footer-bottom p:first-child a {
        white-space: nowrap;
    }

    .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;
    }

    .zc39b3thumb-list,
    .zc39b3thumb-related {
        height: 72px !important;
    }

    .zc39b3thumb-side {
        height: 50px !important;
    }

    .zc39b3thumb-cover {
        max-width: 100% !important;
        width: 100%;
        height: 170px !important;
        margin: 0 auto;
    }
}

@media (max-width: 575px) {
    :root {
        --section-padding: 2.5rem;
    }

    .zc39b3hero-title {
        font-size: 1.5rem;
    }

    .zc39b3hero-image {
        max-width: 180px;
    }

    .zc39b3section-title {
        font-size: 1.35rem;
    }

    .zc39b3stat-number {
        font-size: 1.45rem;
    }

    .zc39b3stat-label {
        font-size: 0.72rem;
    }

    .zc39b3step {
        flex-direction: column;
        align-items: flex-start;
    }

    .zc39b3thumb-home {
        height: 150px !important;
    }

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

    .zc39b3thumb-list,
    .zc39b3thumb-related {
        height: 64px !important;
    }

    .zc39b3thumb-side {
        height: 46px !important;
    }

    .zc39b3thumb-cover {
        height: 150px !important;
    }

    .pagebar .pagelist {
        gap: 0.35rem;
    }

    .zc39b3accordion .accordion-button {
        font-size: 0.85rem;
        padding: 0.8rem 2.5rem 0.8rem 0.875rem;
    }
}

@media (min-width: 576px) and (max-width: 767px) {
    .zc39b3thumb-home {
        height: 110px !important;
    }
}

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

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