/* ============================================
   深蓝科技风格 - 数字资产下载站群模板
   Template 007 - Deep Blue Tech Style
   ============================================ */

/* CSS Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #165DFF;
    --primary-dark: #0E42D2;
    --primary-light: #4080FF;
    --secondary: #0FC6C2;
    --accent: #36CFC9;
    --bg-dark: #0F172A;
    --bg-darker: #0B1120;
    --bg-card: #1E293B;
    --bg-card-hover: #273650;
    --bg-light: #F8FAFC;
    --bg-alt: #F1F5F9;
    --text-primary: #1E293B;
    --text-secondary: #64748B;
    --text-light: #94A3B8;
    --text-white: #FFFFFF;
    --text-white-secondary: rgba(255,255,255,0.7);
    --text-white-muted: rgba(255,255,255,0.5);
    --border: #E2E8F0;
    --border-dark: #334155;
    --success: #00B42A;
    --warning: #FF7D00;
    --danger: #F53F3F;
    --radius-sm: 6px;
    --radius: 10px;
    --radius-lg: 16px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow: 0 4px 12px rgba(0,0,0,0.08);
    --shadow-lg: 0 12px 32px rgba(22, 93, 255, 0.15);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --container: 1200px;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: #FFFFFF;
    overflow-x: hidden;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

.container {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 24px;
}

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

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

ul, ol {
    list-style: none;
}

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

button {
    cursor: pointer;
    border: none;
    background: none;
    font-family: inherit;
    font-size: inherit;
}

/* Section Base */
.section {
    padding: 80px 0;
}

.section-alt {
    background-color: var(--bg-alt);
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 56px;
}

.section-tag {
    display: inline-block;
    padding: 6px 16px;
    background: linear-gradient(135deg, rgba(22,93,255,0.1), rgba(15,198,194,0.1));
    color: var(--primary);
    font-size: 14px;
    font-weight: 500;
    border-radius: 20px;
    margin-bottom: 16px;
}

.section-title {
    font-size: 36px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 16px;
    line-height: 1.3;
}

.section-title.left-aligned {
    text-align: left;
}

.section-desc {
    font-size: 17px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    font-size: 15px;
    font-weight: 500;
    border-radius: var(--radius);
    transition: var(--transition);
    white-space: nowrap;
}

.btn-sm {
    padding: 8px 16px;
    font-size: 14px;
}

.btn-lg {
    padding: 14px 32px;
    font-size: 16px;
}

.btn-block {
    width: 100%;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: white;
    box-shadow: 0 4px 12px rgba(22, 93, 255, 0.3);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(22, 93, 255, 0.4);
}

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

.btn-outline:hover {
    background: var(--primary);
    color: white;
    transform: translateY(-2px);
}

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
}

.btn-ghost:hover {
    background: var(--bg-alt);
    color: var(--primary);
}

/* Header */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
    transition: var(--transition);
}

.site-header.scrolled {
    box-shadow: var(--shadow-sm);
}

.main-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 22px;
    font-weight: 700;
    color: var(--text-primary);
}

.logo-icon {
    font-size: 28px;
    color: var(--primary);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-links {
    display: flex;
    gap: 8px;
}

.nav-link {
    display: block;
    padding: 8px 14px;
    color: var(--text-secondary);
    font-size: 15px;
    font-weight: 500;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.nav-link:hover, .nav-link.active {
    color: var(--primary);
    background: rgba(22,93,255,0.08);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
}

.mobile-menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition);
}

/* Hero Section */
.hero {
    position: relative;
    padding: 140px 0 80px;
    background: linear-gradient(180deg, #F0F5FF 0%, #FFFFFF 100%);
    overflow: hidden;
}

.hero-bg-pattern {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 20% 50%, rgba(22,93,255,0.05) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(15,198,194,0.05) 0%, transparent 50%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-badge {
    display: inline-block;
    padding: 8px 16px;
    background: white;
    border: 1px solid rgba(22,93,255,0.2);
    border-radius: 20px;
    font-size: 14px;
    color: var(--primary);
    font-weight: 500;
    margin-bottom: 24px;
}

.hero-title {
    font-size: 48px;
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-primary);
    margin-bottom: 20px;
}

.hero-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 36px;
    max-width: 520px;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-bottom: 32px;
}

.hero-phone {
    color: var(--text-secondary);
}

.hero-phone:hover {
    color: var(--primary);
}

.hero-trust {
    display: flex;
    flex-wrap: wrap;
    gap: 24px;
}

.trust-item {
    font-size: 14px;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 6px;
}

.hero-image {
    position: relative;
}

.hero-image img {
    width: 100%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

/* Platforms Section */
.platforms-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.platform-card {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px;
    transition: var(--transition);
}

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

.platform-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 16px;
}

.platform-logo {
    width: 52px;
    height: 52px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 14px;
    color: white;
}

.platform-logo.okx { background: linear-gradient(135deg, #165DFF, #4080FF); }
.platform-logo.binance { background: linear-gradient(135deg, #F3BA2F, #FCD535); color: #1E293B; }
.platform-logo.bitget { background: linear-gradient(135deg, #00B42A, #23C343); }
.platform-logo.bybit { background: linear-gradient(135deg, #F7A600, #FFB726); color: #1E293B; }
.platform-logo.kraken { background: linear-gradient(135deg, #5741D9, #7367F0); }
.platform-logo.more { background: linear-gradient(135deg, #64748B, #94A3B8); font-size: 24px; }

.platform-name {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
}

.platform-desc {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 20px;
}

.platform-devices {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 20px;
}

.device-tag {
    padding: 4px 12px;
    background: var(--bg-alt);
    color: var(--text-secondary);
    font-size: 13px;
    border-radius: 6px;
}

.platform-links {
    display: flex;
    gap: 12px;
    margin-bottom: 16px;
}

.platform-link {
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition);
}

.platform-link.primary {
    background: var(--primary);
    color: white;
}

.platform-link.primary:hover {
    background: var(--primary-dark);
    color: white;
}

.platform-link:not(.primary) {
    background: var(--bg-alt);
    color: var(--text-secondary);
}

.platform-link:not(.primary):hover {
    background: var(--primary);
    color: white;
}

.platform-safety {
    font-size: 13px;
    color: var(--warning);
    display: flex;
    align-items: center;
    gap: 8px;
}

.safety-dot {
    width: 8px;
    height: 8px;
    background: var(--warning);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* Downloads Section */
.device-tabs {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 40px;
}

.device-tab {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    background: white;
    border: 2px solid var(--border);
    border-radius: var(--radius);
    font-size: 15px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: var(--transition);
}

.device-tab:hover {
    border-color: var(--primary-light);
    color: var(--primary);
}

.device-tab.active {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

.device-icon {
    font-size: 20px;
}

.download-panels {
    margin-bottom: 48px;
}

.download-panel {
    display: none;
}

.download-panel.active {
    display: block;
    animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.download-guide-card {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 40px;
    background: white;
    border-radius: var(--radius-lg);
    padding: 36px;
    box-shadow: var(--shadow);
}

.download-info h3 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 24px;
    color: var(--text-primary);
}

.info-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 28px;
}

.info-item {
    padding: 16px;
    background: var(--bg-alt);
    border-radius: var(--radius);
}

.info-label {
    display: block;
    font-size: 13px;
    color: var(--text-light);
    margin-bottom: 6px;
}

.info-value {
    display: block;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-primary);
}

.download-checklist h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.download-checklist ul {
    display: grid;
    gap: 8px;
}

.download-checklist li {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.download-actions {
    display: flex;
    flex-direction: column;
    gap: 12px;
    justify-content: center;
}

.action-note {
    padding: 16px;
    background: #FFF7E6;
    border: 1px solid #FFE7BA;
    border-radius: var(--radius);
    font-size: 14px;
    color: var(--warning);
    text-align: center;
    line-height: 1.6;
}

.safety-highlight {
    display: flex;
    gap: 28px;
    background: linear-gradient(135deg, #E8F3FF, #E6FFFB);
    border-radius: var(--radius-lg);
    padding: 36px;
    border-left: 4px solid var(--primary);
}

.safety-icon-large {
    font-size: 48px;
    flex-shrink: 0;
}

.safety-content h3 {
    font-size: 22px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 20px;
}

.safety-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
}

.safety-list li {
    font-size: 14px;
    line-height: 1.7;
    color: var(--text-secondary);
}

.safety-list strong {
    color: var(--text-primary);
}

/* Features Section */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 32px;
}

.feature-card {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px;
    transition: var(--transition);
}

.feature-card:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow);
    transform: translateY(-2px);
}

.feature-icon {
    font-size: 36px;
    margin-bottom: 16px;
}

.feature-card h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.feature-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
}

.risk-notice-box {
    background: #FFF1F0;
    border: 1px solid #FFCCC7;
    border-radius: var(--radius);
    padding: 20px 24px;
}

.risk-notice-box p {
    font-size: 14px;
    color: var(--danger);
    line-height: 1.7;
}

.risk-notice-box strong {
    color: #CF1322;
}

/* Guide Section */
.guide-steps {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.step-item {
    position: relative;
    display: flex;
    gap: 32px;
    padding-bottom: 48px;
}

.step-item:last-child {
    padding-bottom: 0;
}

.step-item::before {
    content: '';
    position: absolute;
    left: 32px;
    top: 64px;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--primary), var(--secondary));
}

.step-item:last-child::before {
    display: none;
}

.step-number {
    position: relative;
    z-index: 1;
    flex-shrink: 0;
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: 700;
    color: white;
    box-shadow: 0 4px 12px rgba(22,93,255,0.3);
}

.step-content {
    flex: 1;
    padding-top: 8px;
}

.step-content h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.step-content p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 12px;
}

.step-tip {
    display: inline-block;
    padding: 8px 16px;
    background: #E8F3FF;
    border-radius: var(--radius-sm);
    font-size: 13px;
    color: var(--primary);
}

/* News / Articles Section - CSS Grid Rules Mandatory */
ul.article-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 24px;
    list-style: none;
    margin: 0;
    padding: 0;
    width: 100%;
    box-sizing: border-box;
}

ul.article-cards > li.article-card {
    min-width: 0;
    width: auto;
    max-width: none;
    margin: 0;
    float: none;
    box-sizing: border-box;
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
}

ul.article-cards > li.article-card:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.article-card .card-thumb {
    width: 100%;
    overflow: hidden;
    aspect-ratio: 16/9;
}

.article-card .card-thumb img {
    display: block;
    width: 100%;
    max-width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

ul.article-cards > li.article-card:hover .card-thumb img {
    transform: scale(1.05);
}

.article-card .card-body {
    padding: 20px;
}

.article-card .card-title {
    overflow-wrap: anywhere;
    font-size: 16px;
    font-weight: 600;
    line-height: 1.5;
    color: var(--text-primary);
    margin-bottom: 12px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-card .card-date {
    display: block;
    font-size: 13px;
    color: var(--text-light);
    margin-bottom: 10px;
}

.article-card .card-summary {
    overflow-wrap: anywhere;
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-card a {
    color: inherit;
}

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

/* FAQ Section */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 16px;
    overflow: hidden;
    transition: var(--transition);
}

.faq-item:hover {
    border-color: var(--primary-light);
}

.faq-item.active {
    border-color: var(--primary);
    box-shadow: 0 2px 8px rgba(22,93,255,0.1);
}

.faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    font-size: 16px;
    font-weight: 500;
    color: var(--text-primary);
    text-align: left;
    gap: 16px;
}

.faq-icon {
    flex-shrink: 0;
    width: 28px;
    height: 28px;
    background: var(--bg-alt);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: 300;
    color: var(--text-secondary);
    transition: var(--transition);
}

.faq-item.active .faq-icon {
    background: var(--primary);
    color: white;
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-item.active .faq-answer {
    max-height: 500px;
}

.faq-answer p {
    padding: 0 24px 20px;
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.8;
}

/* About Section */
.about-wrapper {
    max-width: 900px;
    margin: 0 auto;
}

.about-lead {
    font-size: 18px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 36px;
}

.about-services {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 32px;
}

.service-item {
    display: flex;
    gap: 16px;
    padding: 20px;
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: var(--transition);
}

.service-item:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-sm);
}

.service-icon {
    font-size: 28px;
    flex-shrink: 0;
}

.service-item h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.service-item p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.about-disclaimer {
    padding: 24px;
    background: #FFF7E6;
    border: 1px solid #FFE7BA;
    border-radius: var(--radius);
}

.about-disclaimer p {
    font-size: 14px;
    color: #D46B08;
    line-height: 1.8;
}

.about-disclaimer strong {
    color: #AD4E00;
}

/* Contact Section */
.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 420px;
    gap: 40px;
    max-width: 1000px;
    margin: 0 auto;
}

.contact-info {
    padding: 36px;
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
}

.contact-brand {
    font-size: 28px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 28px;
}

.contact-method {
    margin-bottom: 28px;
}

.contact-method h4 {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-light);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 12px;
}

.contact-phone-large {
    display: block;
    font-size: 32px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 8px;
}

.contact-note {
    font-size: 14px;
    color: var(--text-secondary);
}

.contact-list {
    display: grid;
    gap: 10px;
}

.contact-list li {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.contact-warning {
    padding: 20px;
    background: #FFF1F0;
    border-radius: var(--radius);
    margin-top: 24px;
}

.contact-warning p {
    font-size: 13px;
    color: var(--danger);
    line-height: 1.7;
}

.contact-form-wrapper {
    padding: 36px;
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
}

.contact-form-wrapper h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.form-note {
    font-size: 13px;
    color: var(--warning);
    margin-bottom: 24px;
    padding: 10px 14px;
    background: #FFF7E6;
    border-radius: var(--radius-sm);
}

.form-group {
    margin-bottom: 18px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 15px;
    font-family: inherit;
    color: var(--text-primary);
    transition: var(--transition);
    background: white;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(22,93,255,0.1);
}

.form-group textarea {
    resize: vertical;
}

.form-success {
    text-align: center;
    padding: 40px 20px;
}

.success-icon {
    width: 64px;
    height: 64px;
    background: #E8FFEA;
    color: var(--success);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    margin: 0 auto 20px;
}

.form-success p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* Risk Banner */
.risk-banner {
    background: var(--bg-darker);
    padding: 20px 0;
    border-top: 1px solid var(--border-dark);
}

.risk-content {
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.risk-icon {
    font-size: 20px;
    flex-shrink: 0;
    margin-top: 2px;
}

.risk-content p {
    font-size: 14px;
    color: var(--text-white-secondary);
    line-height: 1.7;
}

.risk-content strong {
    color: var(--warning);
}

/* Footer */
.site-footer {
    background: var(--bg-dark);
    padding: 64px 0 32px;
    color: var(--text-white-secondary);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 48px;
    padding-bottom: 48px;
    border-bottom: 1px solid var(--border-dark);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 22px;
    font-weight: 700;
    color: var(--text-white);
    margin-bottom: 16px;
}

.footer-desc {
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 20px;
}

.footer-phone {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 18px;
    font-weight: 600;
    color: var(--secondary);
}

.footer-phone:hover {
    color: var(--accent);
}

.footer-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-white);
    margin-bottom: 20px;
}

.footer-links {
    display: grid;
    gap: 12px;
}

.footer-links a {
    font-size: 14px;
    color: var(--text-white-secondary);
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--secondary);
    padding-left: 4px;
}

.footer-bottom {
    text-align: center;
}

.footer-copyright {
    margin-bottom: 20px;
}

.footer-copyright p {
    font-size: 13px;
    color: var(--text-white-muted);
    line-height: 1.8;
}

.footer-grouplinks {
    margin-bottom: 20px;
}

.footer-grouplinks a {
    font-size: 13px;
    color: var(--text-white-muted);
    margin: 0 8px;
}

.footer-grouplinks a:hover {
    color: var(--secondary);
}

.footer-beian {
    font-size: 13px;
}

.footer-beian a {
    color: var(--text-white-muted);
}

.footer-beian a:hover {
    color: var(--secondary);
}

.footer-beian .divider {
    margin: 0 12px;
    color: var(--border-dark);
}

/* Back to Top */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 48px;
    height: 48px;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    font-size: 20px;
    box-shadow: 0 4px 12px rgba(22,93,255,0.3);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: var(--transition);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-4px);
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    padding: 24px;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    position: relative;
    background: white;
    border-radius: var(--radius-lg);
    padding: 40px 32px 32px;
    max-width: 440px;
    width: 100%;
    text-align: center;
    transform: scale(0.9);
    transition: var(--transition);
}

.modal-overlay.active .modal {
    transform: scale(1);
}

.modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    width: 32px;
    height: 32px;
    font-size: 24px;
    color: var(--text-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-close:hover {
    background: var(--bg-alt);
    color: var(--text-primary);
}

.modal h3 {
    font-size: 22px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.modal p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 16px;
}

.modal-note {
    padding: 16px;
    background: #FFF7E6;
    border-radius: var(--radius);
    font-size: 14px !important;
    color: var(--warning) !important;
    margin-bottom: 24px !important;
}

/* ============================================
   Article Detail Page Styles
   ============================================ */
.article-page {
    padding: 120px 0 80px;
}

.article-container {
    max-width: 800px;
    margin: 0 auto;
}

.article-breadcrumb {
    margin-bottom: 24px;
    font-size: 14px;
    color: var(--text-light);
}

.article-breadcrumb a {
    color: var(--text-secondary);
}

.article-breadcrumb a:hover {
    color: var(--primary);
}

.article-title {
    font-size: 36px;
    font-weight: 700;
    line-height: 1.3;
    color: var(--text-primary);
    margin-bottom: 20px;
}

.article-summary-box {
    padding: 20px 24px;
    background: var(--bg-alt);
    border-left: 4px solid var(--primary);
    border-radius: 0 var(--radius) var(--radius) 0;
    margin-bottom: 20px;
}

.article-summary-box p {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.8;
    font-style: italic;
}

.article-meta {
    margin-bottom: 28px;
}

.meta-date {
    font-size: 14px;
    color: var(--text-light);
}

.article-cover-wrapper {
    margin-bottom: 32px;
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.article-cover {
    width: 100%;
}

.article-content {
    font-size: 16px;
    line-height: 1.9;
    color: var(--text-primary);
    margin-bottom: 48px;
}

.article-content p {
    margin-bottom: 20px;
}

.article-content h2 {
    font-size: 26px;
    font-weight: 700;
    margin: 36px 0 16px;
    color: var(--text-primary);
}

.article-content h3 {
    font-size: 22px;
    font-weight: 600;
    margin: 28px 0 12px;
    color: var(--text-primary);
}

.article-content h4 {
    font-size: 18px;
    font-weight: 600;
    margin: 24px 0 10px;
    color: var(--text-primary);
}

.article-content ul, .article-content ol {
    margin: 16px 0;
    padding-left: 24px;
}

.article-content ul {
    list-style: disc;
}

.article-content ol {
    list-style: decimal;
}

.article-content li {
    margin-bottom: 8px;
}

.article-content img {
    max-width: 100%;
    border-radius: var(--radius);
    margin: 24px 0;
}

.article-content blockquote {
    padding: 20px 24px;
    background: var(--bg-alt);
    border-left: 4px solid var(--secondary);
    border-radius: 0 var(--radius) var(--radius) 0;
    margin: 24px 0;
}

.article-content blockquote p {
    margin-bottom: 0;
    color: var(--text-secondary);
}

.article-navigation {
    margin-bottom: 48px;
    padding: 32px;
    background: var(--bg-alt);
    border-radius: var(--radius-lg);
}

.article-navigation h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 20px;
}

.nav-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.nav-card {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px;
    background: white;
    border-radius: var(--radius);
    transition: var(--transition);
}

.nav-card:hover {
    background: white;
    box-shadow: var(--shadow-sm);
    transform: translateY(-2px);
}

.nav-card-icon {
    font-size: 28px;
}

.nav-card-title {
    display: block;
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.nav-card-desc {
    font-size: 13px;
    color: var(--text-light);
}

.article-cta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    padding: 32px;
    background: linear-gradient(135deg, #E8F3FF, #E6FFFB);
    border-radius: var(--radius-lg);
}

.cta-content h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.cta-content p {
    font-size: 14px;
    color: var(--text-secondary);
}

.cta-actions {
    display: flex;
    gap: 12px;
    flex-shrink: 0;
}

/* ============================================
   Responsive Styles
   ============================================ */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }
    
    .hero-subtitle {
        margin-left: auto;
        margin-right: auto;
    }
    
    .hero-actions {
        justify-content: center;
    }
    
    .hero-trust {
        justify-content: center;
    }
    
    .platforms-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .download-guide-card {
        grid-template-columns: 1fr;
    }
    
    .safety-highlight {
        flex-direction: column;
        gap: 20px;
    }
    
    .safety-list {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
    }
    
    .contact-wrapper {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .section {
        padding: 56px 0;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .main-nav {
        height: 64px;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 64px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 20px;
        gap: 20px;
        border-bottom: 1px solid var(--border);
        box-shadow: var(--shadow);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-links {
        flex-direction: column;
        width: 100%;
    }
    
    .nav-link {
        padding: 12px 16px;
    }
    
    .nav-actions {
        width: 100%;
    }
    
    .nav-actions .btn {
        flex: 1;
    }
    
    .hero {
        padding: 100px 0 60px;
    }
    
    .hero-title {
        font-size: 32px;
    }
    
    .hero-subtitle {
        font-size: 16px;
    }
    
    .hero-actions {
        flex-direction: column;
    }
    
    .hero-actions .btn {
        width: 100%;
    }
    
    .hero-trust {
        flex-direction: column;
        gap: 12px;
        align-items: flex-start;
    }
    
    .platforms-grid {
        grid-template-columns: 1fr;
    }
    
    .device-tabs {
        gap: 8px;
    }
    
    .device-tab {
        padding: 10px 16px;
        font-size: 14px;
    }
    
    .download-guide-card {
        padding: 24px;
    }
    
    .info-grid {
        grid-template-columns: 1fr;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .about-services {
        grid-template-columns: 1fr;
    }
    
    .nav-cards {
        grid-template-columns: 1fr;
    }
    
    .article-cta {
        flex-direction: column;
        text-align: center;
    }
    
    .cta-actions {
        width: 100%;
        flex-direction: column;
    }
    
    .cta-actions .btn {
        width: 100%;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    
    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 44px;
        height: 44px;
    }
    
    .article-page {
        padding: 100px 0 60px;
    }
    
    .article-title {
        font-size: 28px;
    }
    
    .contact-info, .contact-form-wrapper {
        padding: 24px;
    }
    
    .contact-phone-large {
        font-size: 24px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    
    .section {
        padding: 48px 0;
    }
    
    .hero-title {
        font-size: 26px;
    }
    
    .platform-card {
        padding: 20px;
    }
    
    .download-guide-card {
        padding: 20px;
    }
    
    .step-item {
        gap: 20px;
    }
    
    .step-number {
        width: 48px;
        height: 48px;
        font-size: 20px;
    }
    
    .step-item::before {
        left: 23px;
    }
}