@keyframes spin {
from {
    transform: rotate(0deg);
}
to {
    transform: rotate(360deg);
}
}

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

body {
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial,
    "PingFang SC", "Microsoft YaHei", sans-serif;
line-height: 1.6;
color: #202124;
background: #fff;
}

/* Header */
header {
background: #fff;
box-shadow: 0 1px 4px rgba(0, 0, 0, 0.08);
position: sticky;
top: 0;
z-index: 100;
}

.header-container {
max-width: 1200px;
margin: 0 auto;
padding: 14px 24px;
display: flex;
align-items: center;
justify-content: space-between;
}

.logo {
display: flex;
align-items: center;
gap: 12px;
text-decoration: none;
color: #202124;
}

.logo svg {
width: 36px;
height: 36px;
}

.logo-text {
font-size: 18px;
font-weight: 600;
letter-spacing: -0.3px;
}

.logo-text span {
color: #5f6368;
font-weight: 400;
font-size: 13px;
margin-left: 6px;
}

nav {
display: flex;
gap: 8px;
}

nav a {
text-decoration: none;
color: #5f6368;
font-size: 14px;
font-weight: 500;
padding: 8px 16px;
border-radius: 20px;
transition: all 0.2s;
}

nav a:hover {
color: #1a73e8;
background: #e8f0fe;
}

nav a.active {
color: #1a73e8;
background: #e8f0fe;
}

/* Hero Section */
.hero {
background: linear-gradient(160deg, #eef4ff 0%, #f0f6ff 40%, #fef7e0 100%);
padding: 100px 24px 80px;
text-align: center;
position: relative;
overflow: hidden;
}

.hero::before {
content: "";
position: absolute;
top: -60%;
left: -20%;
width: 140%;
height: 140%;
background: radial-gradient(ellipse at 30% 50%, rgba(66, 133, 244, 0.06) 0%, transparent 60%),
    radial-gradient(ellipse at 70% 30%, rgba(251, 188, 5, 0.05) 0%, transparent 50%);
pointer-events: none;
}

.hero-container {
max-width: 860px;
margin: 0 auto;
position: relative;
z-index: 1;
}

.hero-badge {
display: inline-flex;
align-items: center;
gap: 6px;
background: rgba(26, 115, 232, 0.1);
color: #1a73e8;
padding: 6px 16px;
border-radius: 20px;
font-size: 13px;
font-weight: 500;
margin-bottom: 28px;
}

.hero-badge svg {
width: 14px;
height: 14px;
}

.hero h1 {
font-size: 52px;
font-weight: 700;
margin-bottom: 20px;
color: #202124;
line-height: 1.2;
letter-spacing: -1px;
}

.hero h1 em {
font-style: normal;
background: linear-gradient(135deg, #4285f4, #34a853);
-webkit-background-clip: text;
-webkit-text-fill-color: transparent;
background-clip: text;
}

.hero p {
font-size: 18px;
color: #5f6368;
margin-bottom: 40px;
max-width: 620px;
margin-left: auto;
margin-right: auto;
line-height: 1.8;
}

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

.btn-primary {
display: inline-flex;
align-items: center;
gap: 10px;
background: #1a73e8;
color: #fff;
padding: 16px 36px;
border-radius: 12px;
text-decoration: none;
font-size: 16px;
font-weight: 600;
transition: all 0.25s;
box-shadow: 0 4px 16px rgba(26, 115, 232, 0.3);
border: none;
cursor: pointer;
font-family: inherit;
line-height: 1.6;
}

.btn-primary:hover {
background: #1557b0;
transform: translateY(-2px);
box-shadow: 0 6px 24px rgba(26, 115, 232, 0.4);
}

.btn-primary svg {
width: 22px;
height: 22px;
}

.btn-secondary {
display: inline-flex;
align-items: center;
gap: 8px;
color: #1a73e8;
padding: 16px 28px;
border-radius: 12px;
text-decoration: none;
font-size: 15px;
font-weight: 500;
transition: all 0.2s;
border: 1.5px solid #dadce0;
background: #fff;
}

.btn-secondary:hover {
border-color: #1a73e8;
background: #f8fbff;
}

.btn-secondary svg {
width: 18px;
height: 18px;
}

.hero-stats {
display: flex;
justify-content: center;
gap: 48px;
margin-top: 56px;
padding-top: 40px;
border-top: 1px solid rgba(0, 0, 0, 0.06);
}

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

.stat-number {
font-size: 28px;
font-weight: 700;
color: #202124;
}

.stat-label {
font-size: 13px;
color: #5f6368;
margin-top: 4px;
}

/* Features */
.features {
padding: 90px 24px;
background: #fff;
}

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

.section-header {
text-align: center;
margin-bottom: 64px;
}

.section-header h2 {
font-size: 38px;
font-weight: 700;
margin-bottom: 16px;
color: #202124;
letter-spacing: -0.5px;
}

.section-header p {
font-size: 16px;
color: #5f6368;
max-width: 560px;
margin: 0 auto;
}

.features-grid {
display: grid;
grid-template-columns: repeat(3, 1fr);
gap: 28px;
}

.feature-card {
padding: 36px 28px;
border-radius: 16px;
border: 1px solid #e8eaed;
transition: all 0.3s;
position: relative;
}

.feature-card:hover {
border-color: transparent;
box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
transform: translateY(-4px);
}

.feature-icon {
width: 56px;
height: 56px;
border-radius: 14px;
display: flex;
align-items: center;
justify-content: center;
margin-bottom: 20px;
}

.feature-icon svg {
width: 28px;
height: 28px;
}

.fi-blue {
background: #e8f0fe;
}
.fi-blue svg {
color: #1a73e8;
}
.fi-green {
background: #e6f4ea;
}
.fi-green svg {
color: #34a853;
}
.fi-red {
background: #fce8e6;
}
.fi-red svg {
color: #ea4335;
}
.fi-yellow {
background: #fef7e0;
}
.fi-yellow svg {
color: #f9ab00;
}
.fi-purple {
background: #f3e8fd;
}
.fi-purple svg {
color: #a142f4;
}
.fi-teal {
background: #e0f7fa;
}
.fi-teal svg {
color: #00897b;
}

.feature-card h3 {
font-size: 18px;
font-weight: 600;
margin-bottom: 10px;
color: #202124;
}

.feature-card p {
color: #5f6368;
font-size: 14px;
line-height: 1.7;
}

/* Platform Section */
.platforms {
padding: 90px 24px;
background: #f8f9fa;
}

.platform-grid {
display: grid;
grid-template-columns: repeat(4, 1fr);
gap: 20px;
}

.platform-card {
background: #fff;
border-radius: 16px;
padding: 32px 24px;
text-align: center;
transition: all 0.3s;
box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
}

.platform-card:hover {
transform: translateY(-4px);
box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

.platform-icon {
width: 64px;
height: 64px;
margin: 0 auto 16px;
background: #f8f9fa;
border-radius: 16px;
display: flex;
align-items: center;
justify-content: center;
}

.platform-icon svg {
width: 32px;
height: 32px;
color: #5f6368;
}

.platform-card h3 {
font-size: 16px;
font-weight: 600;
margin-bottom: 6px;
color: #202124;
}

.platform-card .platform-desc {
font-size: 13px;
color: #5f6368;
margin-bottom: 20px;
}

.platform-link {
display: inline-flex;
align-items: center;
gap: 6px;
color: #1a73e8;
text-decoration: none;
font-size: 14px;
font-weight: 500;
}

.platform-link:hover {
text-decoration: underline;
}

.platform-link svg {
width: 16px;
height: 16px;
}

/* Advantages */
.advantages {
padding: 90px 24px;
background: #fff;
}

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

.adv-content h2 {
font-size: 36px;
font-weight: 700;
margin-bottom: 20px;
color: #202124;
letter-spacing: -0.5px;
}

.adv-content > p {
font-size: 16px;
color: #5f6368;
margin-bottom: 32px;
line-height: 1.8;
}

.adv-list {
list-style: none;
}

.adv-list li {
display: flex;
align-items: flex-start;
gap: 14px;
padding: 14px 0;
border-bottom: 1px solid #f1f3f4;
}

.adv-list li:last-child {
border-bottom: none;
}

.adv-check {
width: 24px;
height: 24px;
background: #e6f4ea;
border-radius: 50%;
display: flex;
align-items: center;
justify-content: center;
flex-shrink: 0;
margin-top: 2px;
}

.adv-check svg {
width: 14px;
height: 14px;
color: #34a853;
}

.adv-list .adv-text strong {
display: block;
font-size: 15px;
font-weight: 600;
color: #202124;
margin-bottom: 2px;
}

.adv-list .adv-text span {
font-size: 13px;
color: #5f6368;
}

.adv-visual {
display: flex;
flex-direction: column;
gap: 20px;
}

.adv-card {
background: linear-gradient(135deg, #f8f9fa 0%, #fff 100%);
border: 1px solid #e8eaed;
border-radius: 16px;
padding: 28px;
display: flex;
align-items: center;
gap: 20px;
}

.adv-card-icon {
width: 52px;
height: 52px;
border-radius: 14px;
display: flex;
align-items: center;
justify-content: center;
flex-shrink: 0;
}

.adv-card-icon svg {
width: 26px;
height: 26px;
}

.adv-card h4 {
font-size: 15px;
font-weight: 600;
color: #202124;
margin-bottom: 4px;
}

.adv-card p {
font-size: 13px;
color: #5f6368;
line-height: 1.5;
}

/* FAQ Section */
.faq {
padding: 90px 24px;
background: #f8f9fa;
}

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

.faq-item {
background: #fff;
border-radius: 12px;
margin-bottom: 12px;
box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
overflow: hidden;
transition: box-shadow 0.3s;
}

.faq-item:hover {
box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.faq-question {
padding: 22px 24px;
cursor: pointer;
display: flex;
justify-content: space-between;
align-items: center;
font-weight: 600;
font-size: 15px;
color: #202124;
user-select: none;
}

.faq-question:hover {
background: #fafbfc;
}

.faq-question svg {
width: 22px;
height: 22px;
color: #5f6368;
transition: transform 0.3s;
flex-shrink: 0;
margin-left: 16px;
}

.faq-item.active .faq-question svg {
transform: rotate(180deg);
color: #1a73e8;
}

.faq-answer {
padding: 0 24px;
max-height: 0;
overflow: hidden;
transition:
    max-height 0.35s ease,
    padding 0.35s ease;
color: #5f6368;
line-height: 1.8;
font-size: 14px;
}

.faq-item.active .faq-answer {
padding: 0 24px 22px;
max-height: 500px;
}

/* CTA Section */
.cta {
padding: 80px 24px;
background: linear-gradient(135deg, #1a73e8 0%, #4285f4 50%, #34a853 100%);
text-align: center;
color: #fff;
}

.cta h2 {
font-size: 36px;
font-weight: 700;
margin-bottom: 16px;
}

.cta p {
font-size: 17px;
opacity: 0.9;
margin-bottom: 36px;
max-width: 520px;
margin-left: auto;
margin-right: auto;
}

.btn-white {
display: inline-flex;
align-items: center;
gap: 10px;
background: #fff;
color: #1a73e8;
padding: 16px 36px;
border-radius: 12px;
text-decoration: none;
font-size: 16px;
font-weight: 600;
transition: all 0.25s;
box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}

.btn-white:hover {
transform: translateY(-2px);
box-shadow: 0 6px 24px rgba(0, 0, 0, 0.2);
}

.btn-white svg {
width: 22px;
height: 22px;
}

/* Footer */
footer {
background: #1a1a2e;
color: #9aa0a6;
padding: 48px 24px 36px;
}

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

.footer-top {
display: flex;
justify-content: space-between;
align-items: flex-start;
padding-bottom: 32px;
border-bottom: 1px solid rgba(255, 255, 255, 0.08);
margin-bottom: 28px;
}

.footer-brand {
display: flex;
align-items: center;
gap: 10px;
color: #e8eaed;
font-size: 16px;
font-weight: 600;
}

.footer-brand svg {
width: 28px;
height: 28px;
}

.footer-nav {
display: flex;
gap: 28px;
}

.footer-nav a {
color: #9aa0a6;
text-decoration: none;
font-size: 14px;
transition: color 0.2s;
}

.footer-nav a:hover {
color: #e8eaed;
}

.footer-disclaimer {
text-align: center;
padding: 20px 0 0;
}

.footer-disclaimer .disclaimer-box {
background: rgba(255, 255, 255, 0.04);
border: 1px solid rgba(255, 255, 255, 0.06);
border-radius: 10px;
padding: 16px 24px;
margin-bottom: 16px;
display: inline-flex;
align-items: center;
gap: 10px;
}

.disclaimer-box svg {
width: 18px;
height: 18px;
color: #f9ab00;
flex-shrink: 0;
}

.disclaimer-box span {
font-size: 13px;
color: #bdc1c6;
}

.footer-disclaimer p {
font-size: 12px;
color: #5f6368;
margin-top: 8px;
}

/* Mobile hamburger */
.mobile-menu-btn {
display: none;
background: none;
border: none;
cursor: pointer;
padding: 8px;
}

.mobile-menu-btn svg {
width: 24px;
height: 24px;
color: #5f6368;
}

/* Responsive */
@media (max-width: 1024px) {
.features-grid {
    grid-template-columns: repeat(2, 1fr);
}
.platform-grid {
    grid-template-columns: repeat(2, 1fr);
}
.adv-grid {
    grid-template-columns: 1fr;
    gap: 40px;
}
}

@media (max-width: 768px) {
.mobile-menu-btn {
    display: block;
}

nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: #fff;
    flex-direction: column;
    padding: 16px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    gap: 4px;
}

nav.open {
    display: flex;
}

nav a {
    padding: 12px 16px;
    border-radius: 8px;
}

.hero {
    padding: 60px 20px 48px;
}

.hero h1 {
    font-size: 32px;
}

.hero p {
    font-size: 16px;
}

.hero-stats {
    gap: 24px;
}

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

.section-header h2 {
    font-size: 28px;
}

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

.platform-grid {
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.footer-top {
    flex-direction: column;
    gap: 20px;
    align-items: center;
}

.cta h2 {
    font-size: 26px;
}
}

@media (max-width: 480px) {
.hero-actions {
    flex-direction: column;
}

.btn-primary,
.btn-secondary {
    width: 100%;
    justify-content: center;
}

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