:root {
--primary: #1E40AF;
--primary-dark: #1E3A8A;
--primary-light: #3B82F6;
--text-primary: #111827;
--text-secondary: #4B5563;
--text-muted: #6B7280;
--bg-white: #FFFFFF;
--bg-gray: #F9FAFB;
--bg-light: #F3F4F6;
--border-color: #E5E7EB;
--shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
--shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -1px rgba(0,0,0,0.04);
--shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -2px rgba(0,0,0,0.03);
--radius-sm: 4px;
--radius-md: 8px;
--radius-lg: 12px;
--transition: all 0.3s ease;
}

* {
margin: 0;
padding: 0;
box-sizing: border-box;
}

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

body {
font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
color: var(--text-primary);
background-color: var(--bg-white);
line-height: 1.7;
-webkit-font-smoothing: antialiased;
}

.container {
max-width: 1200px;
margin: 0 auto;
padding: 0 24px;
}

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

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

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

ul {
list-style: none;
}

.btn {
display: inline-flex;
align-items: center;
justify-content: center;
padding: 12px 28px;
font-size: 15px;
font-weight: 500;
border-radius: var(--radius-md);
cursor: pointer;
transition: var(--transition);
border: none;
text-decoration: none;
}

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

.btn-primary:hover {
background-color: var(--primary-dark);
color: #fff;
transform: translateY(-1px);
box-shadow: var(--shadow-md);
}

.btn-secondary {
background-color: transparent;
color: var(--primary);
border: 1px solid var(--primary);
}

.btn-secondary:hover {
background-color: var(--primary);
color: #fff;
}

.btn-block {
width: 100%;
}

.header {
position: fixed;
top: 0;
left: 0;
right: 0;
background: rgba(255,255,255,0.95);
backdrop-filter: blur(10px);
z-index: 1000;
border-bottom: 1px solid var(--border-color);
}

.header-container {
max-width: 1200px;
margin: 0 auto;
padding: 0 24px;
display: flex;
align-items: center;
justify-content: space-between;
height: 72px;
}

.logo {
display: flex;
align-items: center;
gap: 10px;
}

.logo img {
border-radius: var(--radius-sm);
}

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

.nav-list {
display: flex;
gap: 32px;
}

.nav-list li {
list-style: none;
}

.nav-list a {
color: var(--text-secondary);
font-size: 15px;
font-weight: 500;
padding: 8px 0;
position: relative;
display: block;
}

.nav-list a:hover {
color: var(--primary);
}

.nav-list a::after {
content: "";
position: absolute;
bottom: 0;
left: 0;
width: 0;
height: 2px;
background: var(--primary);
transition: var(--transition);
}

.nav-list a:hover::after {
width: 100%;
}

.nav-header {
display: none;
}

.nav-toggle {
display: none;
width: 48px;
height: 48px;
padding: 0;
background: transparent;
border: none;
cursor: pointer;
position: relative;
z-index: 1001;
border-radius: var(--radius-md);
transition: var(--transition);
}

.nav-toggle span {
display: block;
width: 22px;
height: 2px;
background: var(--text-primary);
position: absolute;
left: 50%;
transform: translateX(-50%);
transition: all 0.3s ease;
border-radius: 2px;
}

.nav-toggle span:nth-child(1) {
top: 16px;
}

.nav-toggle span:nth-child(2) {
top: 23px;
width: 16px;
}

.nav-toggle span:nth-child(3) {
top: 30px;
}

.mobile-menu-overlay {
display: none;
}

.breadcrumb {
display: flex;
align-items: center;
gap: 8px;
font-size: 14px;
color: var(--text-muted);
margin-bottom: 24px;
}

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

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

.breadcrumb .separator {
color: var(--border-color);
}

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

.hero {
padding: 120px 0 80px;
background: linear-gradient(180deg, var(--bg-gray) 0%, var(--bg-white) 100%);
}

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

.hero-text h1 {
font-size: 42px;
font-weight: 700;
line-height: 1.3;
color: var(--text-primary);
margin-bottom: 20px;
}

.hero-desc {
font-size: 17px;
color: var(--text-secondary);
margin-bottom: 32px;
line-height: 1.8;
}

.hero-buttons {
display: flex;
gap: 16px;
margin-bottom: 48px;
}

.hero-stats {
display: flex;
gap: 48px;
}

.stat-item {
text-align: left;
}

.stat-num {
display: block;
font-size: 32px;
font-weight: 700;
color: var(--primary);
line-height: 1.2;
}

.stat-label {
font-size: 14px;
color: var(--text-muted);
}

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

.section {
padding: 80px 0;
}

.section:nth-child(even) {
background-color: var(--bg-gray);
}

.section-title {
font-size: 32px;
font-weight: 700;
text-align: center;
margin-bottom: 16px;
color: var(--text-primary);
}

.section-desc {
font-size: 16px;
color: var(--text-secondary);
text-align: center;
max-width: 800px;
margin: 0 auto 48px;
line-height: 1.8;
}

.about-grid {
display: grid;
grid-template-columns: repeat(2, 1fr);
gap: 24px;
margin-bottom: 48px;
}

.about-card {
background: var(--bg-white);
border: 1px solid var(--border-color);
border-radius: var(--radius-lg);
padding: 24px;
transition: var(--transition);
display: flex;
flex-direction: column;
}

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

.card-image {
width: 100%;
height: 160px;
border-radius: var(--radius-md);
overflow: hidden;
margin-bottom: 20px;
background: var(--bg-light);
display: flex;
align-items: center;
justify-content: center;
}

.card-image img {
width: 100%;
height: 100%;
object-fit: cover;
transition: transform 0.4s ease;
}

.about-card:hover .card-image img {
transform: scale(1.05);
}

.card-icon {
width: 56px;
height: 56px;
display: flex;
align-items: center;
justify-content: center;
background: var(--bg-light);
border-radius: var(--radius-md);
margin-bottom: 20px;
color: var(--primary);
}

.about-card h3 {
font-size: 18px;
font-weight: 600;
margin-bottom: 12px;
color: var(--text-primary);
}

.about-card p {
font-size: 15px;
color: var(--text-secondary);
line-height: 1.7;
}

.about-image {
text-align: center;
}

.about-image img {
max-width: 500px;
margin: 0 auto;
border-radius: var(--radius-lg);
}

.download-grid {
display: grid;
grid-template-columns: repeat(3, 1fr);
gap: 24px;
margin-bottom: 48px;
}

.download-card {
background: var(--bg-white);
border: 1px solid var(--border-color);
border-radius: var(--radius-lg);
padding: 32px;
text-align: center;
transition: var(--transition);
}

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

.download-icon {
width: 80px;
height: 80px;
display: flex;
align-items: center;
justify-content: center;
margin: 0 auto 24px;
border-radius: 50%;
background: var(--bg-light);
}

.download-icon.android {
color: #3DDC84;
}

.download-icon.ios {
color: #333;
}

.download-icon.desktop {
color: var(--primary);
}

.download-card h3 {
font-size: 20px;
font-weight: 600;
margin-bottom: 12px;
}

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

.download-features {
text-align: left;
margin-bottom: 24px;
padding: 16px;
background: var(--bg-gray);
border-radius: var(--radius-md);
}

.download-features li {
font-size: 14px;
color: var(--text-secondary);
padding: 6px 0;
padding-left: 20px;
position: relative;
}

.download-features li::before {
content: "✓";
position: absolute;
left: 0;
color: var(--primary);
font-weight: 600;
}

.download-notice {
background: var(--bg-light);
border-radius: var(--radius-lg);
padding: 32px;
border-left: 4px solid var(--primary);
}

.download-notice h3 {
font-size: 18px;
font-weight: 600;
margin-bottom: 12px;
}

.download-notice p {
font-size: 15px;
color: var(--text-secondary);
line-height: 1.8;
}

.tutorial-steps {
display: grid;
grid-template-columns: repeat(4, 1fr);
gap: 24px;
margin-bottom: 48px;
}

.step-card {
background: var(--bg-white);
border: 1px solid var(--border-color);
border-radius: var(--radius-lg);
padding: 28px;
position: relative;
transition: var(--transition);
}

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

.step-number {
font-size: 48px;
font-weight: 700;
color: var(--bg-light);
position: absolute;
top: 16px;
right: 20px;
line-height: 1;
}

.step-card h3 {
font-size: 17px;
font-weight: 600;
margin-bottom: 12px;
color: var(--primary);
}

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

.tutorial-image {
text-align: center;
margin-bottom: 48px;
}

.tutorial-image img {
border-radius: var(--radius-lg);
box-shadow: var(--shadow-md);
max-width: 700px;
margin: 0 auto;
}

.tutorial-tips {
background: var(--bg-white);
border: 1px solid var(--border-color);
border-radius: var(--radius-lg);
padding: 32px;
}

.tutorial-tips h3 {
font-size: 20px;
font-weight: 600;
margin-bottom: 24px;
text-align: center;
}

.tips-grid {
display: grid;
grid-template-columns: repeat(3, 1fr);
gap: 24px;
}

.tip-item {
padding: 20px;
background: var(--bg-gray);
border-radius: var(--radius-md);
}

.tip-item h4 {
font-size: 16px;
font-weight: 600;
margin-bottom: 8px;
color: var(--text-primary);
}

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

.assets-content {
display: grid;
grid-template-columns: 1fr 1fr;
gap: 48px;
align-items: center;
margin-bottom: 32px;
}

.asset-block {
margin-bottom: 28px;
}

.asset-block:last-child {
margin-bottom: 0;
}

.asset-block h3 {
font-size: 18px;
font-weight: 600;
margin-bottom: 12px;
color: var(--text-primary);
}

.asset-block p {
font-size: 15px;
color: var(--text-secondary);
line-height: 1.8;
}

.assets-image img {
border-radius: var(--radius-lg);
max-width: 400px;
margin: 0 auto;
}

.assets-notice {
background: #FEF3C7;
border-radius: var(--radius-md);
padding: 20px 24px;
border-left: 4px solid #F59E0B;
}

.assets-notice p {
font-size: 14px;
color: #92400E;
line-height: 1.7;
}

.security-grid {
display: grid;
grid-template-columns: repeat(2, 1fr);
gap: 24px;
margin-bottom: 48px;
}

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

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

.security-card.highlight {
border-color: var(--primary-light);
background: linear-gradient(135deg, rgba(30,64,175,0.02) 0%, rgba(59,130,246,0.05) 100%);
}

.security-card h3 {
font-size: 18px;
font-weight: 600;
margin-bottom: 12px;
color: var(--text-primary);
}

.security-card p {
font-size: 15px;
color: var(--text-secondary);
line-height: 1.8;
}

.security-actions {
background: var(--bg-white);
border: 1px solid var(--border-color);
border-radius: var(--radius-lg);
padding: 32px;
margin-bottom: 48px;
}

.security-actions h3 {
font-size: 20px;
font-weight: 600;
margin-bottom: 24px;
}

.action-list {
display: grid;
grid-template-columns: repeat(2, 1fr);
gap: 24px;
}

.action-item {
padding: 20px;
background: var(--bg-gray);
border-radius: var(--radius-md);
}

.action-item h4 {
font-size: 16px;
font-weight: 600;
margin-bottom: 8px;
color: var(--primary);
}

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

.security-image {
text-align: center;
}

.security-image img {
max-width: 350px;
margin: 0 auto;
border-radius: var(--radius-lg);
}

.verify-content {
display: flex;
flex-direction: column;
gap: 32px;
}

.verify-methods {
display: grid;
grid-template-columns: repeat(2, 1fr);
gap: 24px;
}

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

.method-card h3 {
font-size: 18px;
font-weight: 600;
margin-bottom: 16px;
color: var(--text-primary);
}

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

.method-steps p {
padding-left: 0;
}

.verify-warning {
background: #FEE2E2;
border-radius: var(--radius-lg);
padding: 24px;
border-left: 4px solid #EF4444;
}

.verify-warning h3 {
font-size: 17px;
font-weight: 600;
margin-bottom: 12px;
color: #B91C1C;
}

.verify-warning p {
font-size: 14px;
color: #991B1B;
line-height: 1.8;
}

.faq-list {
max-width: 900px;
margin: 0 auto;
}

.faq-item {
background: var(--bg-white);
border: 1px solid var(--border-color);
border-radius: var(--radius-md);
margin-bottom: 12px;
overflow: hidden;
transition: var(--transition);
}

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

.faq-question {
display: flex;
align-items: center;
justify-content: space-between;
padding: 20px 24px;
cursor: pointer;
}

.faq-question h3 {
font-size: 16px;
font-weight: 600;
color: var(--text-primary);
}

.faq-toggle {
width: 24px;
height: 24px;
position: relative;
flex-shrink: 0;
}

.faq-toggle::before,
.faq-toggle::after {
content: "";
position: absolute;
background: var(--text-muted);
transition: var(--transition);
}

.faq-toggle::before {
width: 12px;
height: 2px;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
}

.faq-toggle::after {
width: 2px;
height: 12px;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
}

.faq-item.active .faq-toggle::after {
transform: translate(-50%, -50%) rotate(90deg);
opacity: 0;
}

.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;
}

.brand-content {
display: grid;
grid-template-columns: 1fr 1.2fr;
gap: 48px;
align-items: center;
}

.brand-image img {
max-width: 400px;
border-radius: var(--radius-lg);
}

.brand-text h3 {
font-size: 20px;
font-weight: 600;
margin-bottom: 12px;
color: var(--text-primary);
margin-top: 24px;
}

.brand-text h3:first-child {
margin-top: 0;
}

.brand-text p {
font-size: 15px;
color: var(--text-secondary);
line-height: 1.8;
}

.version-grid {
display: grid;
grid-template-columns: repeat(2, 1fr);
gap: 24px;
}

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

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

.version-card h3 {
font-size: 18px;
font-weight: 600;
margin-bottom: 12px;
color: var(--text-primary);
}

.version-card p {
font-size: 15px;
color: var(--text-secondary);
line-height: 1.8;
}

.contact-content {
display: flex;
flex-direction: column;
gap: 32px;
}

.contact-info {
display: grid;
grid-template-columns: repeat(2, 1fr);
gap: 24px;
}

.contact-card {
background: var(--bg-white);
border: 1px solid var(--border-color);
border-radius: var(--radius-lg);
padding: 32px;
text-align: center;
}

.contact-card h3 {
font-size: 20px;
font-weight: 600;
margin-bottom: 12px;
}

.contact-card p {
font-size: 15px;
color: var(--text-secondary);
margin-bottom: 24px;
line-height: 1.7;
}

.contact-help {
background: var(--bg-light);
border-radius: var(--radius-lg);
padding: 28px;
}

.contact-help h3 {
font-size: 18px;
font-weight: 600;
margin-bottom: 12px;
}

.contact-help p {
font-size: 15px;
color: var(--text-secondary);
line-height: 1.8;
}

.footer {
background: var(--text-primary);
color: #fff;
padding: 60px 0 0;
}

.footer-main {
display: grid;
grid-template-columns: 1.2fr 2fr;
gap: 60px;
padding-bottom: 40px;
border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-brand {
display: flex;
flex-direction: column;
gap: 16px;
}

.footer-brand img {
border-radius: var(--radius-sm);
}

.footer-logo-text {
font-size: 22px;
font-weight: 600;
}

.footer-desc {
font-size: 14px;
color: rgba(255,255,255,0.7);
line-height: 1.7;
}

.footer-links {
display: grid;
grid-template-columns: repeat(3, 1fr);
gap: 40px;
}

.footer-col h4 {
font-size: 16px;
font-weight: 600;
margin-bottom: 20px;
}

.footer-col ul li {
margin-bottom: 12px;
}

.footer-col a {
color: rgba(255,255,255,0.7);
font-size: 14px;
}

.footer-col a:hover {
color: #fff;
}

.footer-bottom {
padding: 24px 0;
text-align: center;
}

.copyright {
font-size: 14px;
color: rgba(255,255,255,0.6);
margin-bottom: 8px;
}

.disclaimer {
font-size: 13px;
color: rgba(255,255,255,0.5);
}

.back-to-top {
position: fixed;
bottom: 100px;
right: 24px;
width: 48px;
height: 48px;
background: var(--bg-white);
border: 1px solid var(--border-color);
border-radius: 50%;
display: flex;
align-items: center;
justify-content: center;
cursor: pointer;
opacity: 0;
visibility: hidden;
transition: var(--transition);
box-shadow: var(--shadow-md);
color: var(--text-secondary);
z-index: 999;
}

.back-to-top:hover {
background: var(--primary);
color: #fff;
border-color: var(--primary);
}

.back-to-top.visible {
opacity: 1;
visibility: visible;
}

@media (max-width: 1024px) {
.hero-content {
grid-template-columns: 1fr;
gap: 40px;
}

.hero-text h1 {
font-size: 36px;
}

.hero-image {
order: -1;
}

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

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

.tutorial-steps {
grid-template-columns: repeat(2, 1fr);
}

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

.assets-content {
grid-template-columns: 1fr;
}

.assets-image {
order: -1;
}

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

.action-list {
grid-template-columns: 1fr;
}

.verify-methods {
grid-template-columns: 1fr;
}

.brand-content {
grid-template-columns: 1fr;
}

.brand-image {
text-align: center;
}

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

.contact-info {
grid-template-columns: 1fr;
}

.footer-main {
grid-template-columns: 1fr;
gap: 40px;
}

.footer-links {
grid-template-columns: repeat(3, 1fr);
}
}

@media (max-width: 768px) {
html {
font-size: 15px;
}

.header-container {
height: 64px;
}

.nav-toggle {
display: flex;
align-items: center;
justify-content: center;
}

.nav-toggle:hover {
background: var(--bg-light);
}

.nav-toggle.active span:nth-child(1) {
top: 23px;
transform: translateX(-50%) rotate(45deg);
}

.nav-toggle.active span:nth-child(2) {
opacity: 0;
transform: translateX(-50%) translateX(20px);
}

.nav-toggle.active span:nth-child(3) {
top: 23px;
transform: translateX(-50%) rotate(-45deg);
}

.mobile-menu-overlay {
display: block;
position: fixed;
top: 64px;
left: 0;
right: 0;
bottom: 0;
background: rgba(17, 24, 39, 0.5);
backdrop-filter: blur(4px);
-webkit-backdrop-filter: blur(4px);
opacity: 0;
visibility: hidden;
transition: all 0.3s ease;
z-index: 998;
}

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

.nav {
position: fixed;
top: 64px;
right: 0;
bottom: 0;
width: 280px;
max-width: 80vw;
background: #1E40AF;
background: linear-gradient(180deg, #1E40AF 0%, #1E3A8A 100%);
padding: 0;
transform: translateX(100%);
visibility: hidden;
transition: transform 0.35s ease, visibility 0.35s ease;
z-index: 999;
box-shadow: -8px 0 30px rgba(0,0,0,0.15);
border-top-left-radius: 16px;
overflow: hidden;
}

.nav.active {
transform: translateX(0);
visibility: visible;
}

.nav-header {
display: block;
padding: 20px 24px 16px;
border-bottom: 1px solid rgba(255,255,255,0.15);
}

.nav-title {
font-size: 13px;
font-weight: 600;
color: rgba(255,255,255,0.6);
text-transform: uppercase;
letter-spacing: 1px;
display: block;
}

.nav-list {
display: flex;
flex-direction: column;
gap: 0;
padding: 12px 0;
}

.nav-list li {
display: block;
}

.nav-list a {
display: block;
padding: 14px 28px;
font-size: 16px;
font-weight: 500;
color: rgba(255,255,255,0.95);
letter-spacing: 0.5px;
transition: all 0.2s ease;
border-left: 3px solid transparent;
}

.nav-list a::before,
.nav-list a::after {
display: none;
content: none;
}

.nav-list a:hover,
.nav-list a:active {
color: #fff;
background: rgba(255,255,255,0.1);
border-left-color: #fff;
}

.hero {
padding: 100px 0 60px;
}

.hero-text h1 {
font-size: 26px;
line-height: 1.4;
}

.hero-desc {
font-size: 15px;
}

.hero-buttons {
flex-direction: column;
gap: 12px;
}

.hero-buttons .btn {
width: 100%;
padding: 14px 24px;
font-size: 16px;
}

.hero-stats {
gap: 20px;
justify-content: space-between;
}

.stat-num {
font-size: 22px;
}

.stat-label {
font-size: 13px;
}

.section {
padding: 50px 0;
}

.section-title {
font-size: 22px;
line-height: 1.4;
}

.section-desc {
font-size: 14px;
margin-bottom: 32px;
}

.tutorial-steps {
grid-template-columns: 1fr;
}

.step-number {
font-size: 36px;
}

.footer-links {
grid-template-columns: 1fr 1fr;
gap: 24px;
}

.back-to-top {
bottom: 80px;
right: 16px;
width: 44px;
height: 44px;
}
}

@media (max-width: 480px) {
.container {
padding: 0 16px;
}

.header-container {
padding: 0 16px;
}

.logo-text {
font-size: 18px;
}

.hero {
padding: 90px 0 50px;
}

.hero-text h1 {
font-size: 22px;
}

.hero-desc {
font-size: 14px;
}

.hero-stats {
flex-wrap: wrap;
gap: 16px;
}

.stat-item {
width: calc(50% - 8px);
text-align: center;
padding: 12px;
background: rgba(30, 64, 175, 0.05);
border-radius: 8px;
}

.stat-num {
font-size: 20px;
}

.section {
padding: 40px 0;
}

.section-title {
font-size: 20px;
}

.about-card,
.download-card,
.version-card,
.contact-card {
padding: 20px;
}

.card-image {
height: 140px;
}

.faq-question {
padding: 14px 16px;
}

.faq-question h3 {
font-size: 14px;
}

.faq-answer p {
padding: 0 16px 14px;
font-size: 13px;
}

.footer-links {
grid-template-columns: 1fr;
}

.footer-main {
padding-bottom: 30px;
}

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

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

.btn {
padding: 12px 20px;
font-size: 14px;
}

.nav {
width: 260px;
}

.nav-list a {
padding: 12px 24px;
font-size: 15px;
}
}

@media screen and (max-width: 768px) {
#nav {
position: fixed;
top: 64px;
right: 0;
bottom: 0;
left: auto;
width: 280px;
max-width: 80vw;
background: #1E40AF;
padding: 0;
transform: translateX(100%);
visibility: hidden;
z-index: 999;
box-shadow: -8px 0 30px rgba(0,0,0,0.15);
border-top-left-radius: 16px;
overflow: hidden;
transition: transform 0.3s ease, visibility 0.3s ease;
}

#nav.active {
transform: translateX(0);
visibility: visible;
}

#nav .nav-header {
display: block;
padding: 20px 24px 16px;
border-bottom: 1px solid rgba(255,255,255,0.15);
}

#nav .nav-title {
font-size: 13px;
font-weight: 600;
color: rgba(255,255,255,0.6);
text-transform: uppercase;
letter-spacing: 1px;
}

#nav .nav-list {
display: flex;
flex-direction: column;
padding: 12px 0;
gap: 0;
}

#nav .nav-list li {
display: block;
}

#nav .nav-list a {
display: block;
padding: 14px 28px;
font-size: 16px;
font-weight: 500;
color: #fff;
border-left: 3px solid transparent;
}

#nav .nav-list a:hover {
background: rgba(255,255,255,0.1);
border-left-color: #fff;
}
}

/* ========== 移动端导航修复 - 最高优先级 ========== */
@media screen and (max-width: 768px) {
  nav#nav.nav {
    position: fixed !important;
    top: 64px !important;
    right: 0 !important;
    bottom: 0 !important;
    left: auto !important;
    width: 280px !important;
    max-width: 80vw !important;
    height: auto !important;
    background: linear-gradient(180deg, #1E40AF 0%, #1E3A8A 100%) !important;
    padding: 0 !important;
    margin: 0 !important;
    transform: translateX(100%) !important;
    visibility: hidden !important;
    opacity: 1 !important;
    z-index: 9999 !important;
    box-shadow: -8px 0 30px rgba(0,0,0,0.2) !important;
    border-top-left-radius: 16px !important;
    overflow: visible !important;
    display: block !important;
    transition: transform 0.3s ease, visibility 0.3s ease !important;
  }

  nav#nav.nav.active {
    transform: translateX(0) !important;
    visibility: visible !important;
  }

  nav#nav.nav .nav-header {
    display: block !important;
    padding: 24px 24px 20px !important;
    border-bottom: 1px solid rgba(255,255,255,0.2) !important;
    background: transparent !important;
  }

  nav#nav.nav .nav-header .nav-title {
    display: block !important;
    font-size: 12px !important;
    font-weight: 600 !important;
    color: rgba(255,255,255,0.6) !important;
    text-transform: uppercase !important;
    letter-spacing: 1.5px !important;
  }

  nav#nav.nav .nav-list {
    display: flex !important;
    flex-direction: column !important;
    padding: 16px 0 !important;
    margin: 0 !important;
    gap: 0 !important;
    list-style: none !important;
    background: transparent !important;
  }

  nav#nav.nav .nav-list li {
    display: block !important;
    margin: 0 !important;
    padding: 0 !important;
    opacity: 1 !important;
    transform: none !important;
    visibility: visible !important;
    background: transparent !important;
    border: none !important;
  }

  nav#nav.nav .nav-list li a {
    display: block !important;
    padding: 16px 28px !important;
    margin: 0 !important;
    font-size: 16px !important;
    font-weight: 500 !important;
    color: #ffffff !important;
    background: transparent !important;
    border: none !important;
    border-left: 3px solid transparent !important;
    text-decoration: none !important;
    opacity: 1 !important;
    visibility: visible !important;
    transition: all 0.2s ease !important;
  }

  nav#nav.nav .nav-list li a::before,
  nav#nav.nav .nav-list li a::after {
    display: none !important;
    content: none !important;
  }

  nav#nav.nav .nav-list li a:hover,
  nav#nav.nav .nav-list li a:active {
    background: rgba(255,255,255,0.1) !important;
    border-left-color: #ffffff !important;
    color: #ffffff !important;
  }
}