:root {
--primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
--secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
--dark-gradient: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
--glass-bg: rgba(255, 255, 255, 0.1);
--glass-border: rgba(255, 255, 255, 0.2);
--glass-shadow: 0 8px 32px rgba(31, 38, 135, 0.15);
--text-primary: #1a1a2e;
--text-secondary: #4a4a6a;
--text-light: #ffffff;
--bg-light: #f8f9fe;
--bg-alt: #eef1f8;
--accent: #667eea;
--accent-hover: #764ba2;
--success: #10b981;
--warning: #f59e0b;
--danger: #ef4444;
--radius-sm: 8px;
--radius-md: 16px;
--radius-lg: 24px;
--radius-xl: 32px;
--shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
--shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
--shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.16);
--transition: all 0.3s ease;
--header-height: 72px;
}

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

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

body {
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
color: var(--text-primary);
background: var(--bg-light);
line-height: 1.7;
overflow-x: hidden;
}

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

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

ul, ol {
list-style: none;
}

.container {
width: 100%;
max-width: 1200px;
margin: 0 auto;
padding: 0 24px;
}

.btn {
display: inline-flex;
align-items: center;
justify-content: center;
padding: 14px 32px;
font-size: 1rem;
font-weight: 600;
border: none;
border-radius: var(--radius-md);
cursor: pointer;
transition: var(--transition);
white-space: nowrap;
}

.btn-primary {
background: var(--primary-gradient);
color: var(--text-light);
box-shadow: 0 4px 16px rgba(102, 126, 234, 0.4);
}

.btn-primary:hover {
transform: translateY(-2px);
box-shadow: 0 6px 24px rgba(102, 126, 234, 0.5);
}

.btn-glass {
background: var(--glass-bg);
color: var(--text-light);
border: 1px solid var(--glass-border);
backdrop-filter: blur(10px);
}

.btn-glass:hover {
background: rgba(255, 255, 255, 0.2);
}

.btn-glow {
animation: glow 2s ease-in-out infinite alternate;
}

@keyframes glow {
from {
box-shadow: 0 4px 16px rgba(102, 126, 234, 0.4);
}
to {
box-shadow: 0 4px 24px rgba(118, 75, 162, 0.6), 0 0 40px rgba(102, 126, 234, 0.3);
}
}

.btn-lg {
padding: 18px 48px;
font-size: 1.125rem;
}

.glass-card {
background: rgba(255, 255, 255, 0.7);
backdrop-filter: blur(20px);
border: 1px solid rgba(255, 255, 255, 0.8);
border-radius: var(--radius-lg);
box-shadow: var(--glass-shadow);
transition: var(--transition);
}

.glass-card:hover {
transform: translateY(-4px);
box-shadow: 0 12px 40px rgba(31, 38, 135, 0.2);
}

.header {
position: fixed;
top: 0;
left: 0;
right: 0;
height: var(--header-height);
background: rgba(255, 255, 255, 0.8);
backdrop-filter: blur(20px);
border-bottom: 1px solid rgba(255, 255, 255, 0.3);
z-index: 1000;
transition: var(--transition);
}

.header.scrolled {
background: rgba(255, 255, 255, 0.95);
box-shadow: var(--shadow-sm);
}

.header-container {
max-width: 1200px;
margin: 0 auto;
padding: 0 24px;
height: 100%;
display: flex;
align-items: center;
justify-content: space-between;
}

.logo {
display: flex;
align-items: center;
gap: 12px;
font-size: 1.25rem;
font-weight: 700;
color: var(--text-primary);
}

.logo img {
width: 36px;
height: 36px;
border-radius: var(--radius-sm);
}

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

.nav-desktop a {
font-size: 0.9375rem;
font-weight: 500;
color: var(--text-secondary);
position: relative;
}

.nav-desktop a::after {
content: "";
position: absolute;
bottom: -4px;
left: 0;
width: 0;
height: 2px;
background: var(--primary-gradient);
transition: var(--transition);
}

.nav-desktop a:hover {
color: var(--accent);
}

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

.nav-toggle {
display: none;
flex-direction: column;
gap: 5px;
padding: 8px;
background: none;
border: none;
cursor: pointer;
}

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

.nav-mobile {
display: none;
position: fixed;
top: var(--header-height);
left: 0;
right: 0;
background: rgba(255, 255, 255, 0.98);
backdrop-filter: blur(20px);
padding: 24px;
flex-direction: column;
gap: 16px;
border-bottom: 1px solid var(--glass-border);
transform: translateY(-100%);
opacity: 0;
transition: var(--transition);
z-index: 999;
}

.nav-mobile.active {
transform: translateY(0);
opacity: 1;
}

.nav-mobile a {
padding: 12px 0;
font-size: 1rem;
font-weight: 500;
color: var(--text-secondary);
border-bottom: 1px solid var(--bg-alt);
}

.nav-mobile a:hover {
color: var(--accent);
}

.hero {
position: relative;
min-height: 100vh;
display: flex;
align-items: center;
justify-content: center;
padding: calc(var(--header-height) + 40px) 24px 80px;
overflow: hidden;
}

.hero-video {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
z-index: -1;
}

.hero-video video {
width: 100%;
height: 100%;
object-fit: cover;
}

.hero-overlay {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
background: linear-gradient(135deg, rgba(102, 126, 234, 0.85) 0%, rgba(118, 75, 162, 0.85) 100%);
}

.hero-content {
position: relative;
max-width: 800px;
text-align: center;
color: var(--text-light);
z-index: 1;
}

.breadcrumb {
display: flex;
align-items: center;
justify-content: center;
gap: 8px;
margin-bottom: 24px;
font-size: 0.875rem;
opacity: 0.9;
}

.breadcrumb a:hover {
text-decoration: underline;
}

.hero h1 {
font-size: clamp(2rem, 5vw, 3.5rem);
font-weight: 800;
line-height: 1.2;
margin-bottom: 24px;
text-shadow: 0 2px 20px rgba(0, 0, 0, 0.2);
}

.hero-desc {
font-size: 1.125rem;
line-height: 1.8;
margin-bottom: 40px;
opacity: 0.95;
}

.hero-btns {
display: flex;
align-items: center;
justify-content: center;
gap: 16px;
flex-wrap: wrap;
}

.hero-scroll {
position: absolute;
bottom: 40px;
left: 50%;
transform: translateX(-50%);
display: flex;
flex-direction: column;
align-items: center;
gap: 8px;
color: var(--text-light);
font-size: 0.875rem;
opacity: 0.8;
}

.scroll-icon {
width: 24px;
height: 40px;
border: 2px solid var(--text-light);
border-radius: 12px;
position: relative;
}

.scroll-icon::after {
content: "";
position: absolute;
top: 8px;
left: 50%;
transform: translateX(-50%);
width: 4px;
height: 8px;
background: var(--text-light);
border-radius: 2px;
animation: scroll 1.5s ease-in-out infinite;
}

@keyframes scroll {
0%, 100% {
opacity: 1;
transform: translateX(-50%) translateY(0);
}
50% {
opacity: 0.5;
transform: translateX(-50%) translateY(8px);
}
}

.section {
padding: 100px 0;
}

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

.section h2 {
font-size: clamp(1.75rem, 4vw, 2.5rem);
font-weight: 700;
text-align: center;
margin-bottom: 16px;
background: var(--primary-gradient);
-webkit-background-clip: text;
-webkit-text-fill-color: transparent;
background-clip: text;
}

.section-desc {
text-align: center;
color: var(--text-secondary);
max-width: 700px;
margin: 0 auto 48px;
font-size: 1.0625rem;
}

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

.intro-text p {
margin-bottom: 20px;
color: var(--text-secondary);
font-size: 1.0625rem;
}

.intro-tags {
display: flex;
flex-wrap: wrap;
gap: 12px;
margin-top: 24px;
}

.tag {
padding: 8px 16px;
background: var(--bg-alt);
border-radius: var(--radius-sm);
font-size: 0.875rem;
color: var(--accent);
font-weight: 500;
}

.intro-image .glass-card {
padding: 24px;
display: flex;
align-items: center;
justify-content: center;
}

.intro-image img {
max-width: 100%;
border-radius: var(--radius-md);
}

.features-grid {
display: grid;
grid-template-columns: repeat(2, 1fr);
gap: 32px;
}

.feature-card {
padding: 32px;
text-align: center;
}

.feature-icon {
width: 140px;
height: 140px;
margin: 0 auto 24px;
border-radius: var(--radius-lg);
overflow: hidden;
background: var(--bg-light);
}

.feature-icon img {
width: 100%;
height: 100%;
object-fit: cover;
}

.feature-card h3 {
font-size: 1.25rem;
font-weight: 600;
margin-bottom: 12px;
color: var(--text-primary);
}

.feature-card p {
color: var(--text-secondary);
font-size: 0.9375rem;
}

.download-wrapper {
display: grid;
grid-template-columns: 1fr 320px;
gap: 48px;
align-items: start;
}

.download-main {
display: flex;
flex-direction: column;
gap: 24px;
}

.download-card {
padding: 32px;
}

.download-card h3 {
font-size: 1.25rem;
font-weight: 600;
margin-bottom: 16px;
color: var(--text-primary);
}

.download-card p {
color: var(--text-secondary);
margin-bottom: 20px;
}

.download-list {
margin-bottom: 24px;
}

.download-list li {
position: relative;
padding-left: 24px;
margin-bottom: 12px;
color: var(--text-secondary);
}

.download-list li::before {
content: "";
position: absolute;
left: 0;
top: 10px;
width: 8px;
height: 8px;
background: var(--primary-gradient);
border-radius: 50%;
}

.download-preview {
position: sticky;
top: calc(var(--header-height) + 24px);
}

.phone-mockup {
display: flex;
justify-content: center;
}

.phone-frame {
background: var(--dark-gradient);
border-radius: 36px;
padding: 12px;
box-shadow: var(--shadow-lg);
}

.phone-frame img {
border-radius: 28px;
width: 270px;
height: auto;
}

.download-notice {
margin-top: 32px;
padding: 24px 32px;
border-left: 4px solid var(--warning);
}

.download-notice h4 {
font-size: 1rem;
font-weight: 600;
margin-bottom: 8px;
color: var(--warning);
}

.download-notice p {
color: var(--text-secondary);
font-size: 0.9375rem;
margin: 0;
}

.guide-grid {
display: grid;
grid-template-columns: repeat(3, 1fr);
gap: 24px;
margin-bottom: 60px;
}

.guide-card {
padding: 32px;
position: relative;
}

.guide-number {
font-size: 3rem;
font-weight: 800;
background: var(--primary-gradient);
-webkit-background-clip: text;
-webkit-text-fill-color: transparent;
background-clip: text;
opacity: 0.3;
line-height: 1;
margin-bottom: 16px;
}

.guide-card h3 {
font-size: 1.125rem;
font-weight: 600;
margin-bottom: 12px;
color: var(--text-primary);
}

.guide-card p {
color: var(--text-secondary);
font-size: 0.9375rem;
}

.guide-app-preview {
background: var(--dark-gradient);
border-radius: var(--radius-xl);
padding: 48px 24px;
text-align: center;
}

.guide-app-preview h3 {
color: var(--text-light);
font-size: 1.25rem;
margin-bottom: 32px;
}

.app-slider {
overflow: hidden;
margin: 0 -24px;
padding: 0 24px;
}

.app-slider-track {
display: flex;
gap: 20px;
animation: slideScroll 20s linear infinite;
}

.app-slide {
flex-shrink: 0;
}

.app-slide img {
border-radius: var(--radius-md);
box-shadow: var(--shadow-lg);
}

@keyframes slideScroll {
0% {
transform: translateX(0);
}
100% {
transform: translateX(-50%);
}
}

.security-grid {
display: grid;
grid-template-columns: 1fr 320px;
gap: 32px;
}

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

.security-card {
padding: 28px;
}

.security-card h3 {
font-size: 1.125rem;
font-weight: 600;
margin-bottom: 12px;
color: var(--text-primary);
}

.security-card > p {
color: var(--text-secondary);
font-size: 0.9375rem;
margin-bottom: 16px;
}

.security-list li {
position: relative;
padding-left: 20px;
margin-bottom: 10px;
color: var(--text-secondary);
font-size: 0.9375rem;
}

.security-list li::before {
content: "✓";
position: absolute;
left: 0;
color: var(--success);
font-weight: 600;
}

.security-aside {
position: sticky;
top: calc(var(--header-height) + 24px);
}

.security-highlight {
padding: 24px;
text-align: center;
}

.security-highlight img {
width: 100%;
border-radius: var(--radius-md);
margin-bottom: 20px;
}

.security-highlight h4 {
font-size: 1.125rem;
font-weight: 600;
margin-bottom: 16px;
color: var(--text-primary);
}

.security-highlight ul {
text-align: left;
margin-bottom: 20px;
}

.security-highlight li {
padding: 8px 0;
padding-left: 24px;
position: relative;
color: var(--text-secondary);
font-size: 0.9375rem;
border-bottom: 1px solid var(--bg-alt);
}

.security-highlight li::before {
content: "?";
position: absolute;
left: 0;
color: var(--accent);
}

.security-notice {
margin-top: 32px;
padding: 20px 24px;
background: rgba(239, 68, 68, 0.08);
border-radius: var(--radius-md);
border-left: 4px solid var(--danger);
}

.security-notice p {
color: var(--danger);
font-size: 0.875rem;
margin: 0;
}

.faq-list {
max-width: 900px;
margin: 0 auto;
display: flex;
flex-direction: column;
gap: 16px;
}

.faq-item {
overflow: hidden;
}

.faq-question {
width: 100%;
padding: 24px 32px;
display: flex;
align-items: center;
justify-content: space-between;
gap: 16px;
background: none;
border: none;
cursor: pointer;
text-align: left;
font-size: 1.0625rem;
font-weight: 600;
color: var(--text-primary);
transition: var(--transition);
}

.faq-question:hover {
color: var(--accent);
}

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

.faq-icon::before,
.faq-icon::after {
content: "";
position: absolute;
top: 50%;
left: 50%;
width: 14px;
height: 2px;
background: var(--accent);
transform: translate(-50%, -50%);
transition: var(--transition);
}

.faq-icon::after {
transform: translate(-50%, -50%) rotate(90deg);
}

.faq-item.active .faq-icon::after {
transform: translate(-50%, -50%) rotate(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 32px 24px;
color: var(--text-secondary);
line-height: 1.8;
}

.faq-more {
text-align: center;
margin-top: 48px;
}

.faq-more p {
margin-bottom: 16px;
color: var(--text-secondary);
}

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

.update-card {
padding: 32px;
}

.update-tag {
display: inline-block;
padding: 6px 14px;
background: var(--primary-gradient);
color: var(--text-light);
font-size: 0.75rem;
font-weight: 600;
border-radius: var(--radius-sm);
margin-bottom: 16px;
}

.update-card h3 {
font-size: 1.125rem;
font-weight: 600;
margin-bottom: 12px;
color: var(--text-primary);
}

.update-card p {
color: var(--text-secondary);
font-size: 0.9375rem;
}

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

.ecosystem-text h3 {
font-size: 1.25rem;
font-weight: 600;
margin: 28px 0 12px;
color: var(--text-primary);
}

.ecosystem-text p {
color: var(--text-secondary);
font-size: 1rem;
}

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

.about-content {
max-width: 900px;
margin: 0 auto;
padding: 40px 48px;
}

.about-content p {
color: var(--text-secondary);
margin-bottom: 16px;
font-size: 1rem;
}

.about-content p:last-child {
margin-bottom: 0;
}

.contact-content {
max-width: 700px;
margin: 0 auto;
text-align: center;
}

.contact-text {
margin-bottom: 32px;
}

.contact-text p {
color: var(--text-secondary);
margin-bottom: 12px;
font-size: 1.0625rem;
}

.footer {
background: var(--dark-gradient);
color: var(--text-light);
padding: 60px 0 32px;
}

.footer-main {
display: grid;
grid-template-columns: 280px 1fr;
gap: 60px;
padding-bottom: 40px;
border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand {
display: flex;
align-items: center;
gap: 12px;
font-size: 1.25rem;
font-weight: 600;
}

.footer-brand img {
width: 40px;
height: 40px;
border-radius: var(--radius-sm);
}

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

.footer-col h4 {
font-size: 1rem;
font-weight: 600;
margin-bottom: 20px;
color: var(--text-light);
}

.footer-col a {
display: block;
padding: 8px 0;
color: rgba(255, 255, 255, 0.7);
font-size: 0.9375rem;
transition: var(--transition);
}

.footer-col a:hover {
color: var(--text-light);
padding-left: 8px;
}

.footer-bottom {
padding-top: 32px;
text-align: center;
}

.footer-bottom p {
color: rgba(255, 255, 255, 0.6);
font-size: 0.875rem;
margin-bottom: 8px;
}

.back-to-top {
position: fixed;
bottom: 100px;
right: 24px;
width: 48px;
height: 48px;
background: var(--primary-gradient);
border: none;
border-radius: 50%;
cursor: pointer;
opacity: 0;
visibility: hidden;
transition: var(--transition);
box-shadow: var(--shadow-md);
z-index: 900;
}

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

.back-to-top:hover {
transform: translateY(-4px);
box-shadow: var(--shadow-lg);
}

.back-to-top span {
display: block;
width: 12px;
height: 12px;
margin: auto;
border-top: 3px solid var(--text-light);
border-right: 3px solid var(--text-light);
transform: rotate(-45deg) translate(2px, 2px);
}

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

.intro-image {
order: -1;
}

.intro-image .glass-card {
max-width: 400px;
margin: 0 auto;
}

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

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

.download-preview {
position: static;
order: -1;
}

.phone-frame img {
width: 220px;
}

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

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

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

.security-aside {
position: static;
max-width: 400px;
margin: 24px auto 0;
}

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

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

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

@media (max-width: 768px) {
:root {
--header-height: 64px;
}

.nav-desktop {
display: none;
}

.nav-toggle {
display: flex;
}

.nav-mobile {
display: flex;
}

.section {
padding: 60px 0;
}

.section h2 {
font-size: 1.5rem;
margin-bottom: 12px;
}

.section-desc {
font-size: 1rem;
margin-bottom: 32px;
}

.hero {
padding-top: calc(var(--header-height) + 24px);
min-height: auto;
padding-bottom: 60px;
}

.hero h1 {
font-size: 1.75rem;
}

.hero-desc {
font-size: 1rem;
}

.hero-scroll {
display: none;
}

.breadcrumb {
font-size: 0.75rem;
}

.intro-text p {
font-size: 1rem;
}

.features-grid {
grid-template-columns: 1fr;
gap: 20px;
}

.feature-card {
padding: 24px;
}

.feature-icon {
width: 100px;
height: 100px;
}

.download-card {
padding: 24px;
}

.guide-grid {
grid-template-columns: 1fr;
gap: 16px;
}

.guide-card {
padding: 24px;
}

.guide-number {
font-size: 2rem;
}

.guide-app-preview {
padding: 32px 16px;
}

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

.security-card {
padding: 24px;
}

.faq-question {
padding: 20px 24px;
font-size: 1rem;
}

.faq-answer p {
padding: 0 24px 20px;
}

.updates-grid {
gap: 16px;
}

.update-card {
padding: 24px;
}

.about-content {
padding: 28px;
}

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

.footer-col:last-child {
grid-column: span 2;
}

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

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

.hero-btns {
flex-direction: column;
width: 100%;
}

.hero-btns .btn {
width: 100%;
}

.intro-tags {
gap: 8px;
}

.tag {
padding: 6px 12px;
font-size: 0.8125rem;
}

.phone-frame img {
width: 200px;
}

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

.footer-col:last-child {
grid-column: span 1;
}
}