:root {
    --primary: #000000;
    --primary-light: #666666;
    --text: #111111;
    --text-secondary: #555555;
    --text-light: #888888;
    --bg: #ffffff;
    --bg-alt: #fafafa;
    --border: #e0e0e0;
    --border-light: #f0f0f0
}
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box
}
html {
    scroll-behavior: smooth;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Microsoft YaHei", sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale
}
body {
    color: var(--text);
    background: var(--bg);
    line-height: 1.6;
    font-size: 15px
}
img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 0 auto
}
a {
    text-decoration: none;
    color: inherit
}
ul {
    list-style: none
}
button {
    border: none;
    background: none;
    cursor: pointer;
    font-family: inherit
}
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px
}
.section {
    padding: 88px 0
}
.bg-alt {
    background: var(--bg-alt)
}
.section-header {
    text-align: center;
    max-width: 640px;
    margin: 0 auto 56px
}
.section-header h2 {
    font-size: 30px;
    font-weight: 600;
    margin-bottom: 12px;
    letter-spacing: -0.01em
}
.section-header p {
    font-size: 15px;
    color: var(--text-light)
}
.contact .section-header h2 {
    color: var(--bg)
}
.contact .section-header p {
    color: rgba(255, 255, 255, 0.85)
}
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 11px 28px;
    font-size: 14px;
    font-weight: 500;
    border-radius: 6px;
    transition: all 0.2s ease
}
.btn:hover {
    transform: translateY(-1px)
}
.btn:active {
    transform: translateY(0)
}
.btn-primary {
    background: var(--primary);
    color: var(--bg)
}
.btn-primary:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15)
}
.btn-outline {
    background: transparent;
    border: 1.5px solid var(--border);
    color: var(--text)
}
.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary)
}
.btn-white {
    background: var(--bg);
    color: var(--text);
    border: 1px solid rgba(255, 255, 255, 0.2)
}
.btn-white:hover {
    background: rgba(255, 255, 255, 0.95)
}
.icon {
    width: 18px;
    height: 18px;
    fill: currentColor
}
header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.98);
    border-bottom: 1px solid var(--border-light)
}
.nav-wrapper {
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between
}
.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 16px;
    font-weight: 600;
    color: var(--text);
    letter-spacing: -0.01em
}
.nav-menu {
    display: flex;
    gap: 32px
}
.nav-link {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: color 0.2s ease;
    display: flex;
    align-items: center
}
.nav-link:hover {
    color: var(--primary)
}
.mobile-toggle {
    display: none;
    color: var(--text);
    padding: 12px;
    border-radius: 8px;
    transition: background 0.2s ease;
    background: var(--bg-alt);
    border: 1.5px solid var(--border-light)
}
.mobile-toggle:hover {
    background: var(--border-light);
    border-color: var(--border)
}
.mobile-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 98;
    opacity: 0;
    transition: opacity 0.3s ease;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px)
}
.mobile-overlay.show {
    display: block;
    opacity: 1
}
.hero {
    padding: 140px 0 100px;
    background: var(--bg)
}
.hero-content {
    text-align: center;
    max-width: 680px;
    margin: 0 auto
}
.badge {
    display: inline-block;
    padding: 6px 16px;
    background: var(--bg-alt);
    color: var(--text-secondary);
    border-radius: 8px;
    font-size: 13px;
    font-weight: 500;
    margin-bottom: 20px;
    border: 1.5px solid var(--border-light);
    letter-spacing: 0.02em
}
.hero h1 {
    font-size: 40px;
    font-weight: 700;
    line-height: 1.25;
    margin-bottom: 16px;
    letter-spacing: -0.02em
}
.hero p {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 32px;
    max-width: 520px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.7
}
.hero-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    margin-bottom: 52px
}
.hero-divider {
    width: 80px;
    height: 3px;
    background: linear-gradient(90deg, transparent, var(--border), transparent);
    margin: 0 auto 52px;
    border-radius: 2px
}
.qr-codes {
    display: flex;
    gap: 48px;
    justify-content: center;
    align-items: flex-start
}
.qr-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center
}
.qr-wrapper {
    position: relative
}
.qr-image {
    width: 150px;
    height: 150px;
    border: 1.5px solid var(--border);
    border-radius: 10px;
    margin: 0 auto 14px;
    padding: 10px;
    background: var(--bg);
    transition: all 0.3s ease;
    object-fit: contain;
    display: block
}
.qr-image:hover {
    border-color: var(--primary);
    transform: scale(1.05);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12)
}
.qr-label {
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 500;
    letter-spacing: 0.02em
}
.card {
    background: var(--bg);
    border: 1.5px solid var(--border-light);
    border-radius: 10px;
    padding: 32px;
    transition: all 0.3s ease
}
.card:hover {
    border-color: var(--border);
    transform: translateY(-2px)
}
.req-list {
    display: grid;
    gap: 20px;
    max-width: 640px;
    margin: 0 auto
}
.req-item {
    display: flex;
    gap: 12px;
    align-items: flex-start
}
.check-icon {
    min-width: 20px;
    height: 20px;
    color: var(--primary);
    padding: 2px;
    flex-shrink: 0;
    background: var(--bg-alt);
    border-radius: 50%;
    transition: all 0.3s ease
}
.req-item:hover .check-icon {
    background: var(--primary);
    color: var(--bg);
    transform: scale(1.1)
}
.req-text {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.7;
    padding-top: 1px;
    transition: color 0.3s ease
}
.req-item:hover .req-text {
    color: var(--text)
}
.docs-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    max-width: 840px;
    margin: 0 auto
}
.doc-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px
}
.doc-icon {
    width: 44px;
    height: 44px;
    background: var(--bg-alt);
    color: var(--primary);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-light)
}
.doc-header h3 {
    font-size: 17px;
    font-weight: 600
}
.doc-items li {
    display: flex;
    align-items: flex-start;
    margin-bottom: 12px;
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7
}
.doc-items li::before {
    content: "";
    width: 4px;
    height: 4px;
    background: var(--primary);
    border-radius: 50%;
    margin-top: 7px;
    margin-right: 10px;
    flex-shrink: 0
}
.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px
}
.feature-card {
    text-align: center;
    padding: 32px 24px;
    border: 1.5px solid var(--border-light);
    border-radius: 10px;
    background: var(--bg);
    transition: all 0.3s ease
}
.feature-card:hover {
    border-color: var(--border);
    transform: translateY(-3px)
}
.f-icon-box {
    width: 52px;
    height: 52px;
    margin: 0 auto 16px;
    background: var(--bg-alt);
    color: var(--primary);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-light);
    transition: all 0.3s ease
}
.feature-card:hover .f-icon-box {
    background: var(--primary);
    color: var(--bg);
    border-color: var(--primary)
}
.feature-card h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 10px
}
.feature-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6
}
.faq-wrapper {
    max-width: 680px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 12px
}
.faq-item {
    background: var(--bg);
    border: 1.5px solid var(--border-light);
    border-radius: 8px;
    overflow: hidden;
    transition: all 0.3s ease
}
.faq-item.active {
    border-color: var(--primary)
}
.faq-btn {
    width: 100%;
    text-align: left;
    padding: 18px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 500;
    color: var(--text);
    font-size: 15px;
    background: none;
    transition: background 0.2s ease
}
.faq-btn:hover {
    background: var(--bg-alt)
}
.faq-chevron {
    width: 18px;
    height: 18px;
    color: var(--text-light);
    transition: transform 0.3s ease;
    flex-shrink: 0
}
.faq-item.active .faq-chevron {
    transform: rotate(180deg);
    color: var(--primary)
}
.faq-body {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
    background: var(--bg-alt)
}
.faq-content {
    padding: 0 20px 20px;
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.7
}
.contact {
    background: var(--primary);
    color: var(--bg);
    text-align: center
}
.contact-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    max-width: 840px;
    margin: 0 auto
}
.contact-card {
    background: rgba(255, 255, 255, 0.08);
    padding: 32px 24px;
    border-radius: 12px;
    border: 1.5px solid rgba(255, 255, 255, 0.12);
    transition: all 0.3s ease
}
.contact-card:hover {
    background: rgba(255, 255, 255, 0.12);
    transform: translateY(-3px);
    border-color: rgba(255, 255, 255, 0.18)
}
.contact-val {
    font-size: 24px;
    font-weight: 600;
    margin: 10px 0 16px;
    display: block;
    transition: transform 0.3s ease
}
.contact-card:hover .contact-val {
    transform: translateY(-2px)
}
.contact-label {
    font-size: 12px;
    opacity: 0.85;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 500
}
.contact-card .btn {
    width: 100%;
    margin-top: 8px
}
.btn-white {
    background: var(--bg);
    color: var(--text);
    border: none
}
footer {
    background: var(--primary);
    color: rgba(255, 255, 255, 0.7);
    padding: 48px 0;
    font-size: 14px;
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.1)
}
.footer-logo {
    color: var(--bg);
    font-weight: 600;
    font-size: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-bottom: 10px
}
footer p {
    color: rgba(255, 255, 255, 0.7)
}
footer p:last-child {
    margin-top: 12px;
    color: rgba(255, 255, 255, 0.5);
    font-size: 13px
}
.scroll-top {
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 44px;
    height: 44px;
    background: var(--bg);
    color: var(--text);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    z-index: 90;
    border: 1.5px solid var(--border);
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1)
}
.scroll-top.show {
    opacity: 1;
    pointer-events: all
}
.scroll-top:hover {
    background: var(--primary);
    color: var(--bg);
    transform: translateY(-3px);
    border-color: var(--primary);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2)
}
.scroll-top:active {
    transform: translateY(-1px)
}
@media (max-width: 1024px) {
    .feature-grid {
        grid-template-columns: repeat(2, 1fr)
    }
}
@media (max-width: 768px) {
    .nav-wrapper {
        padding: 0 16px
    }
    .nav-menu {
        display: none;
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        background: var(--bg);
        flex-direction: column;
        padding: 0 20px;
        gap: 0;
        border-bottom: 1.5px solid var(--border-light);
        z-index: 9999;
        max-height: calc(100vh - 60px);
        overflow-y: auto;
        opacity: 0;
        width: 100%;
        transform: translateY(-100%)
    }
    .nav-menu.open {
        display: flex;
        opacity: 1;
        transform: translateY(0)
    }
    .nav-link {
        display: flex;
        padding: 20px 0;
        border-bottom: 1px solid var(--border-light);
        font-size: 15px;
        width: 100%;
        justify-content: center;
        transition: background 0.2s ease;
        text-decoration: none;
        color: var(--text);
        position: relative;
        pointer-events: all
    }
    .nav-link span {
        color: var(--text)
    }
    .nav-link:active {
        background: var(--bg-alt)
    }
    .nav-link:last-child {
        border-bottom: none
    }
    .nav-link:hover {
        color: var(--primary);
        background: var(--bg-alt)
    }
    .mobile-toggle {
        display: block;
        z-index: 10000;
        position: relative
    }
    .hero-actions {
        flex-direction: column;
        padding: 0 32px
    }
    .hero-divider {
        width: 60px;
        height: 2px;
        margin: 0 auto 40px
    }
    .qr-codes {
        flex-direction: column;
        gap: 24px;
        align-items: center
    }
    .qr-image {
        width: 120px;
        height: 120px;
        padding: 8px
    }
    .qr-label {
        font-size: 12px
    }
    .docs-grid,
    .feature-grid,
    .contact-grid {
        grid-template-columns: 1fr
    }
    .section {
        padding: 64px 0
    }
    .card {
        padding: 24px
    }
    .feature-card {
        padding: 28px 20px
    }
    .contact-card {
        padding: 28px 20px
    }
}
@media (max-width: 480px) {
    .nav-wrapper {
        padding: 0 12px
    }
    .nav-menu {
        padding: 0 16px
    }
    .nav-link {
        padding: 18px 0;
        font-size: 14px
    }
    .mobile-toggle {
        padding: 10px
    }
    .hero {
        padding: 100px 0 60px
    }
    .hero h1 {
        font-size: 28px
    }
    .hero p {
        font-size: 14px;
        max-width: 100%
    }
    .badge {
        font-size: 12px;
        padding: 5px 14px
    }
    .hero-actions {
        padding: 0 20px
    }
    .hero-divider {
        width: 50px;
        height: 2px;
        margin: 0 auto 36px
    }
    .qr-image {
        width: 100px;
        height: 100px;
        padding: 6px
    }
    .qr-label {
        font-size: 11px
    }
    .qr-codes {
        gap: 20px;
        align-items: center
    }
    .container {
        padding: 0 20px
    }
    .section-header h2 {
        font-size: 24px
    }
    .section-header p {
        font-size: 14px
    }
}