:root {
    --primary-dark: #ffffff;
    --secondary-dark: #1e293b;
    --accent-blue: #3b82f6;
    --accent-cyan: #06b6d4;
    --text-primary: #000000;
    --text-secondary: #7f8c8d;
    --card-bg: #ffffff;
    --border-color: #3498db
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif
}

body {
    background-color: var(--primary-dark);
    color: var(--text-primary);
    line-height: 1.6
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.3s ease
}

.container {
    width: 100%;
}
.one{
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.btn {
    display: inline-block;
    padding: 12px 32px;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
    color: white;
    border-radius: 6px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(59, 130, 246, 0.3)
}

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

.btn-outline:hover {
    background-color: rgba(6, 182, 212, 0.1)
}

section {
    padding: 80px 0
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 20px;
    background: linear-gradient(to right, #60a5fa, var(--accent-cyan));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent
}

.section-subtitle {
    text-align: center;
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 700px;
    margin: 0 auto 60px
}

header {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: #ffffff;
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 18px 0;
    border-bottom: 1px solid #f0f0f0;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center
}

.logo > img {
    width: 150px;
}

.nav-links {
    display: flex;
    gap: 40px;
    align-items: center
}

.nav-links a {
    font-weight: 500
}

.nav-links a:hover {
    color: var(--accent-cyan)
}

.nav-links .download-btn {
    background-color: var(--accent-blue);
    padding: 10px 20px;
    border-radius: 6px;
    color:#ffffff;
}

.nav-links .download-btn:hover {
    background-color: #2563eb;
    color: white
}

.mobile-menu-btn {
    display: none;
    font-size: 1.5rem;
    cursor: pointer
}

.hero {
    padding-top: 160px;
    padding-bottom: 100px;
    text-align: center;
    position: relative;
    overflow: hidden;
}


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

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 20px;
    line-height: 1.2;
    color: #3498db;
}

.hero p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto 40px
}

.hero-btns {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap
}

#features {
    background-color: #fafafa;
}

.features-grid {
    display: grid;
    grid-template-columns:repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-top: 40px
}

.feature-card {
    background-color: #ffffff;
    border-radius: 12px;
    padding: 30px;
    border: 1px solid #3498db;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    text-align: center;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    border-color: var(--accent-cyan)
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 20px;
    color: var(--accent-cyan)
}
.feature-icon img{
    width: 50px;
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px
}

.feature-card p {
    color: var(--text-secondary)
}

.platforms {
    background-color: var(--secondary-dark)
}

.platform-grid {
    display: grid;
    grid-template-columns:repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
    margin-top: 40px
}

.platform-card {
    background-color: var(--card-bg);
    border-radius: 12px;
    padding: 30px;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease
}

.platform-card:hover {
    border-color: var(--accent-blue);
    transform: scale(1.03)
}

.platform-icon {
    font-size: 3rem;
    margin-bottom: 20px
}

.windows {
    color: #0078D7
}

.apple {
    color: #A2AAAD
}

.android {
    color: #3DDC84
}

.linux {
    color: #FCC624
}

.platform-card h3 {
    font-size: 1.5rem;
    margin-bottom: 10px
}

.platform-card p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    font-size: 0.9rem
}

.version {
    display: inline-block;
    background-color: var(--primary-dark);
    color: var(--accent-cyan);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    margin-bottom: 20px
}

.official-tag {
    display: inline-block;
    background-color: #10b981;
    color: white;
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-left: 10px
}

.steps {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    margin-top: 60px;
    position: relative
}

.steps::before {
    content: '';
    position: absolute;
    top: 40px;
    left: 10%;
    width: 80%;
    height: 2px;
    background-color: var(--accent-cyan);
    opacity: 0.5;
    z-index: 0
}

.step {
    flex: 1;
    min-width: 200px;
    text-align: center;
    padding: 0 15px;
    position: relative;
    z-index: 1
}

.step-number {
    width: 80px;
    height: 80px;
    background-color: var(--accent-cyan);
    color: var(--primary-dark);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: 700;
    margin: 0 auto 25px
}

.step h3 {
    font-size: 1.5rem;
    margin-bottom: 15px
}

.step p {
    color: var(--text-secondary)
}

.trust-section {
    background-color: #fafafa;
}
.trust-section img{
    width: 50px;
}

.trust-grid {
    display: grid;
    grid-template-columns:repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 40px
}

.trust-card {
    background-color: #ffffff;
    border-radius: 12px;
    padding: 30px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    border: 1px solid var(--border-color)
}

.trust-icon {
    font-size: 2.5rem;
    color: #10b981;
    margin-bottom: 20px
}

.faq-container {
    max-width: 900px;
    margin: 60px auto 0
}

.faq-item {
    background-color: var(--card-bg);
    border-radius: 10px;
    margin-bottom: 20px;
    overflow: hidden;
    border: 1px solid var(--border-color)
}

.faq-question {
    padding: 25px 30px;
    font-size: 1.2rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center
}

.faq-question:hover {
    background-color: rgba(59, 130, 246, 0.05)
}

.faq-answer {
    padding: 0 30px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s ease, padding 0.5s ease;
    color: var(--text-secondary)
}

.faq-answer.active {
    padding: 0 30px 30px;
    max-height: 500px
}

.faq-answer ol {
    padding-left: 20px;
    margin-top: 10px
}

.faq-answer li {
    margin-bottom: 10px
}

.faq-toggle {
    color: var(--accent-cyan);
    font-size: 1.5rem;
    transition: transform 0.3s ease
}

.faq-question.active .faq-toggle {
    transform: rotate(45deg)
}

footer {
    background-color: #ffffff;
    padding: 60px 0 30px;
    border-top: 1px solid var(--border-color)
}

.footer-content {
    display: grid;
    grid-template-columns:repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 40px
}

.footer-col h3 {
    font-size: 1.2rem;
    margin-bottom: 20px;
    color: var(--accent-cyan)
}

.footer-links {
    list-style: none
}

.footer-links li {
    margin-bottom: 12px
}

.footer-links a:hover {
    color: var(--accent-cyan)
}

.copyright {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.9rem
}

.github-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary)
}

.github-link:hover {
    color: var(--accent-cyan)
}

@media (max-width: 992px) {
    .hero h1 {
        font-size: 2.8rem
    }

    .section-title {
        font-size: 2.2rem
    }

    .steps::before {
        display: none
    }

    .step {
        margin-bottom: 40px
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background-color: var(--primary-dark);
        flex-direction: column;
        padding: 20px;
        gap: 20px;
        border-bottom: 1px solid var(--border-color)
    }

    .nav-links.active {
        display: flex
    }

    .mobile-menu-btn {
        display: block
    }

    .hero h1 {
        font-size: 2.3rem
    }

    .hero p {
        font-size: 1.1rem
    }

    .section-title {
        font-size: 2rem
    }
}

@media (max-width: 576px) {
    .hero h1 {
        font-size: 2rem
    }

    .hero-btns {
        flex-direction: column;
        align-items: center
    }

    .btn {
        width: 100%;
        max-width: 300px
    }

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

    .feature-card, .platform-card, .trust-card {
        padding: 20px
    }
}