* {
    box-sizing: border-box;
}

:root {
    --bg: #E6EBF2;
    --surface: #FFFFFF;
    --surface-soft: #F5F7FB;
    --surface-muted: #EEF2F7;
    --surface-deep: #DDE4EE;
    --primary: #289CFF;
    --nav: #4E5F7A;
    --text: #243447;
    --muted: #66788A;
    --hint: #8A9AAF;
    --border: rgba(40,156,255,0.16);
    --shadow: 0 14px 36px rgba(56,92,138,0.12);
    --footer: #243447;
    --footer-text: #EAF3FF;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", Arial, sans-serif;
    line-height: 1.75;
    overflow-x: hidden;
}

body.drawer-open {
    overflow: hidden;
}

a {
    color: inherit;
    text-decoration: none;
}

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

button,
a {
    -webkit-tap-highlight-color: transparent;
}

button {
    font: inherit;
}

.container {
    width: min(1180px, calc(100% - 40px));
    margin-inline: auto;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 9999;
    background: rgba(245,247,251,0.96);
    backdrop-filter: blur(10px);
    box-shadow: 0 8px 24px rgba(56,92,138,0.10);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 22px;
    min-height: 72px;
}

.logo {
    flex: 0 0 auto;
    display: inline-flex;
    align-items: center;
}

.logo img {
    max-height: 50px;
    width: auto;
    display: block;
}

.nav-wrap {
    flex: 1 1 auto;
    min-width: 0;
    display: flex;
    justify-content: center;
}

.nav {
    display: flex;
    align-items: center;
    gap: 16px;
    white-space: nowrap;
    flex-wrap: nowrap;
}

.nav > a,
.nav-trigger {
    position: relative;
    display: inline-flex;
    align-items: center;
    min-height: 72px;
    border: 0;
    background: transparent;
    color: var(--nav);
    font-size: 15px;
    font-weight: 700;
    cursor: pointer;
    padding: 0 2px;
}

.nav > a::after,
.nav-trigger::after {
    content: "";
    position: absolute;
    left: 50%;
    right: 50%;
    bottom: 0;
    height: 3px;
    border-radius: 3px 3px 0 0;
    background: var(--primary);
    transition: left .2s ease, right .2s ease;
}

.nav > a:hover,
.nav > a.active,
.nav-trigger:hover,
.nav-trigger.active {
    color: var(--primary);
}

.nav > a:hover::after,
.nav > a.active::after,
.nav-trigger:hover::after,
.nav-trigger.active::after {
    left: 0;
    right: 0;
}

.nav-trigger {
    padding-right: 16px;
}

.nav-trigger::before {
    content: "";
    position: absolute;
    right: 2px;
    top: 50%;
    width: 6px;
    height: 6px;
    border-right: 2px solid currentColor;
    border-bottom: 2px solid currentColor;
    transform: translateY(-70%) rotate(45deg);
}

.header-action {
    flex: 0 0 auto;
    display: flex;
    align-items: center;
}

.main-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    padding: 0 24px;
    border-radius: 999px;
    background: linear-gradient(180deg, #32D1F6 0%, #27B9F4 35%, #249BFF 100%);
    color: #FFFFFF;
    box-shadow: 0 10px 24px rgba(36,155,255,0.25);
    font-weight: 700;
    transition: transform .2s ease, filter .2s ease, box-shadow .2s ease;
}

.main-btn:hover {
    background: linear-gradient(180deg, #48D9F7 0%, #1E90F0 100%);
    transform: translateY(-1px);
    box-shadow: 0 13px 28px rgba(36,155,255,0.30);
}

.dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: calc(100% - 4px);
    left: 50%;
    min-width: 190px;
    padding: 8px;
    background: #FFFFFF;
    border: 1px solid rgba(40,156,255,0.12);
    border-radius: 14px;
    box-shadow: 0 18px 38px rgba(56,92,138,0.16);
    z-index: 10000;
    opacity: 0;
    visibility: hidden;
    transform: translate(-50%, 8px);
    transition: opacity .18s ease, transform .18s ease, visibility .18s ease;
}

.dropdown:hover .dropdown-menu,
.dropdown:focus-within .dropdown-menu,
.dropdown.open .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translate(-50%, 0);
}

.dropdown-menu a {
    display: block;
    padding: 10px 13px;
    color: var(--nav);
    white-space: nowrap;
    border-radius: 10px;
    font-weight: 600;
}

.dropdown-menu a:hover {
    color: var(--primary);
    background: rgba(40,156,255,0.08);
}

.mobile-menu-btn {
    display: none;
    width: 42px;
    height: 42px;
    padding: 9px;
    border: 0;
    border-radius: 12px;
    background: #FFFFFF;
    box-shadow: 0 7px 18px rgba(56,92,138,.10);
}

.mobile-menu-btn span {
    display: block;
    height: 2px;
    margin: 5px 0;
    border-radius: 2px;
    background: var(--nav);
}

.mobile-drawer {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 12000;
    width: min(84vw, 320px);
    background: #FFFFFF;
    box-shadow: 20px 0 45px rgba(36,52,71,.18);
    transform: translateX(-105%);
    transition: transform .24s ease;
    overflow-y: auto;
}

.mobile-drawer.open {
    transform: translateX(0);
}

.drawer-overlay {
    position: fixed;
    inset: 0;
    z-index: 11000;
    background: rgba(36,52,71,.44);
    opacity: 0;
    transition: opacity .22s ease;
}

.drawer-overlay.show {
    opacity: 1;
}

.drawer-head {
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 10px 18px;
    border-bottom: 1px solid rgba(40,156,255,.12);
    background: var(--surface-soft);
}

.drawer-logo img {
    max-height: 46px;
    width: auto;
    display: block;
}

.drawer-close {
    position: relative;
    width: 40px;
    height: 40px;
    border: 0;
    border-radius: 12px;
    background: #FFFFFF;
}

.drawer-close::before,
.drawer-close::after {
    content: "";
    position: absolute;
    left: 11px;
    right: 11px;
    top: 19px;
    height: 2px;
    background: var(--nav);
}

.drawer-close::before { transform: rotate(45deg); }
.drawer-close::after { transform: rotate(-45deg); }

.drawer-nav {
    padding: 14px;
}

.drawer-nav a {
    display: block;
    padding: 12px 14px;
    margin-bottom: 4px;
    color: var(--nav);
    border-radius: 10px;
    font-weight: 700;
}

.drawer-nav a:hover {
    color: var(--primary);
    background: rgba(40,156,255,.08);
}

.site-main {
    min-height: 60vh;
}

.section-shell {
    padding: 36px 0;
}

.soft-section {
    background: rgba(238,242,247,.72);
    border-block: 1px solid rgba(40,156,255,.08);
}

.banner-slider {
    max-width: 1200px;
    width: min(1200px, calc(100% - 40px));
    margin: 28px auto 18px;
    border-radius: 20px;
    background: #FFFFFF;
    box-shadow: 0 18px 40px rgba(56,92,138,0.12);
    overflow: hidden;
    position: relative;
    z-index: 1;
    aspect-ratio: 16 / 6.4;
    min-height: 260px;
}

.slider-track,
.slider-slide {
    position: absolute;
    inset: 0;
}

.slider-slide {
    opacity: 0;
    visibility: hidden;
    transition: opacity .5s ease, visibility .5s ease;
}

.slider-slide.active {
    opacity: 1;
    visibility: visible;
}

.banner-slider img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    background: #FFFFFF;
    display: block;
}

.banner-caption,
.banner-text,
.slide-title,
.slide-desc,
.slide-content,
.slide-card,
.banner-card {
    display: none !important;
}

.slider-arrow {
    position: absolute;
    top: 50%;
    z-index: 3;
    width: 44px;
    height: 44px;
    border: 1px solid rgba(40,156,255,.18);
    border-radius: 50%;
    background: rgba(255,255,255,.90);
    box-shadow: 0 8px 20px rgba(56,92,138,.14);
    transform: translateY(-50%);
    cursor: pointer;
}

.slider-arrow.prev { left: 16px; }
.slider-arrow.next { right: 16px; }

.slider-arrow::before {
    content: "";
    position: absolute;
    top: 14px;
    width: 12px;
    height: 12px;
    border-top: 3px solid var(--primary);
    border-left: 3px solid var(--primary);
}

.slider-arrow.prev::before {
    left: 17px;
    transform: rotate(-45deg);
}

.slider-arrow.next::before {
    right: 17px;
    transform: rotate(135deg);
}

.slider-dots {
    position: absolute;
    left: 50%;
    bottom: 15px;
    z-index: 3;
    display: flex;
    gap: 8px;
    transform: translateX(-50%);
}

.slider-dot {
    width: 9px;
    height: 9px;
    padding: 0;
    border: 0;
    border-radius: 999px;
    background: rgba(78,95,122,.35);
    cursor: pointer;
    transition: width .2s ease, background .2s ease;
}

.slider-dot.active {
    width: 25px;
    background: var(--primary);
}

.welcome-grid,
.hero-grid,
.split-content,
.two-column-copy,
.media-copy-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(340px, .95fr);
    gap: 34px;
    align-items: center;
}

.welcome-card,
.hero-copy,
.hero-media,
.media-panel,
.notice-card {
    background: rgba(255,255,255,0.92);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    border-radius: 22px;
}

.welcome-card,
.hero-copy {
    padding: clamp(26px, 4vw, 48px);
}

.hero-media,
.media-panel {
    padding: 18px;
}

.hero-media img,
.media-panel img,
.content-img,
.zone-card img,
.app-section img {
    width: 100%;
    height: auto;
    max-height: 460px;
    object-fit: contain;
    display: block;
    border-radius: 16px;
    background: #FFFFFF;
}

.hero-grid.no-image {
    grid-template-columns: 1fr;
}

.hero-grid.no-image .hero-copy {
    max-width: 900px;
    margin-inline: auto;
    text-align: center;
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    min-height: 30px;
    padding: 0 12px;
    margin-bottom: 12px;
    border-radius: 999px;
    background: rgba(40,156,255,.10);
    color: var(--primary);
    font-size: 13px;
    font-weight: 800;
    letter-spacing: .08em;
}

h1, h2, h3, .section-title {
    color: var(--primary);
    line-height: 1.35;
}

h1 {
    margin: 0 0 18px;
    font-size: clamp(32px, 5vw, 54px);
}

h2 {
    margin: 0 0 14px;
    font-size: clamp(25px, 3.4vw, 36px);
}

h3 {
    margin: 0 0 10px;
    font-size: 20px;
}

p {
    margin: 0 0 16px;
    color: var(--muted);
}

.hero-copy > p,
.welcome-card > p {
    font-size: 17px;
}

.hero-links,
.welcome-actions {
    display: flex;
    align-items: center;
    gap: 18px;
    flex-wrap: wrap;
    margin-top: 24px;
}

.text-link {
    color: var(--primary);
    font-weight: 800;
}

.text-link::after {
    content: " →";
}

.section-heading {
    max-width: 780px;
    margin: 0 auto 24px;
    text-align: center;
}

.section-heading.compact {
    margin-bottom: 18px;
}

.section-heading p {
    font-size: 16px;
}

.entry-grid,
.feature-grid,
.product-grid,
.review-grid,
.support-grid,
.faq-summary-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
}

.card,
.zone-card,
.info-card,
.review-card,
.support-card,
.faq-summary-card {
    background: rgba(255,255,255,0.92);
    border: 1px solid var(--border);
    box-shadow: 0 14px 36px rgba(56,92,138,0.10);
    border-radius: 18px;
}

.card,
.info-card,
.support-card,
.faq-summary-card {
    padding: 24px;
}

.card-number {
    display: block;
    margin-bottom: 14px;
    color: var(--primary);
    font-size: 13px;
    font-weight: 900;
    letter-spacing: .12em;
}

.product-grid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
}

.zone-card {
    overflow: hidden;
}

.zone-card img {
    border-radius: 0;
    aspect-ratio: 16 / 10;
    max-height: none;
}

.zone-card .card-body {
    padding: 20px;
}

.app-points,
.security-points {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
    margin-top: 20px;
}

.app-points span,
.security-points span {
    display: block;
    padding: 13px 14px;
    border-radius: 12px;
    background: var(--surface-muted);
    color: var(--nav);
    font-weight: 700;
}

.notice-list,
.steps-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.steps-list {
    display: grid;
    gap: 12px;
}

.steps-list li {
    display: grid;
    grid-template-columns: 150px 1fr;
    gap: 14px;
    align-items: start;
    padding: 18px 20px;
    border-radius: 15px;
    background: rgba(255,255,255,.88);
    border: 1px solid var(--border);
}

.steps-list strong {
    color: var(--primary);
}

.steps-list span {
    color: var(--muted);
}

.review-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.review-card {
    margin: 0;
    padding: 24px;
}

.review-card p {
    margin: 0;
    color: var(--text);
}

.two-column-copy {
    align-items: start;
}

.two-column-copy article {
    padding: 10px 0;
}

.notice-card {
    padding: 28px;
}

.notice-card h2 {
    font-size: 24px;
}

.notice-card ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.notice-card li {
    position: relative;
    padding: 11px 0 11px 26px;
    color: var(--muted);
    border-bottom: 1px solid rgba(40,156,255,.10);
}

.notice-card li:last-child { border-bottom: 0; }

.notice-card li::before {
    content: "";
    position: absolute;
    left: 2px;
    top: 20px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--primary);
    box-shadow: 0 0 0 5px rgba(40,156,255,.10);
}

.faq-list {
    display: grid;
    gap: 12px;
    max-width: 900px;
    margin-inline: auto;
}

.faq-list details {
    background: rgba(255,255,255,.92);
    border: 1px solid var(--border);
    border-radius: 16px;
    box-shadow: 0 10px 26px rgba(56,92,138,.08);
    overflow: hidden;
}

.faq-list summary {
    position: relative;
    cursor: pointer;
    list-style: none;
    padding: 20px 56px 20px 22px;
    color: var(--text);
    font-weight: 800;
}

.faq-list summary::-webkit-details-marker { display: none; }

.faq-list summary::after {
    content: "+";
    position: absolute;
    right: 22px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--primary);
    font-size: 25px;
}

.faq-list details[open] summary::after { content: "−"; }

.faq-list details p {
    padding: 0 22px 20px;
    margin: 0;
}

.site-footer {
    margin-top: 36px;
    background: var(--footer);
    color: var(--footer-text);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.6fr repeat(3, 1fr);
    gap: 36px;
    padding-block: 52px 32px;
}

.footer-logo img {
    max-height: 48px;
    width: auto;
    display: block;
    margin-bottom: 18px;
    filter: brightness(1.1);
}

.footer-brand p,
.site-footer a,
.compliance-note p,
.footer-bottom {
    color: rgba(234,243,255,.82);
}

.footer-grid h2 {
    color: #FFFFFF;
    font-size: 18px;
    margin-bottom: 14px;
}

.footer-grid > div:not(.footer-brand) a {
    display: block;
    padding: 5px 0;
}

.footer-grid a:hover {
    color: #FFFFFF;
}

.compliance-note {
    padding: 20px 0;
    border-top: 1px solid rgba(234,243,255,.12);
    border-bottom: 1px solid rgba(234,243,255,.12);
}

.compliance-note p {
    margin: 0;
    font-size: 14px;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    gap: 20px;
    padding-block: 18px;
    font-size: 13px;
}

@media (max-width: 1120px) {
    .nav-wrap { display: none; }
    .mobile-menu-btn { display: block; }
    .header-inner { grid-template-columns: 46px 1fr auto; }
    .logo { margin-inline: auto; }
    .entry-grid,
    .feature-grid,
    .support-grid,
    .faq-summary-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .product-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (max-width: 860px) {
    .welcome-grid,
    .hero-grid,
    .split-content,
    .two-column-copy,
    .media-copy-grid {
        grid-template-columns: 1fr;
    }
    .hero-media { order: -1; }
    .review-grid { grid-template-columns: 1fr 1fr; }
    .footer-grid { grid-template-columns: 1.5fr 1fr 1fr; }
    .footer-grid > div:last-child { grid-column: 2 / 4; }
}

@media (max-width: 640px) {
    .container { width: min(100% - 24px, 1180px); }
    .header-inner { min-height: 64px; gap: 10px; }
    .logo img { max-height: 42px; max-width: 128px; }
    .main-btn { min-height: 40px; padding: 0 18px; font-size: 14px; }
    .section-shell { padding: 26px 0; }
    .banner-slider {
        width: calc(100% - 24px);
        margin-top: 16px;
        border-radius: 16px;
        aspect-ratio: 16 / 9;
        min-height: 190px;
    }
    .slider-arrow { width: 38px; height: 38px; }
    .slider-arrow.prev { left: 10px; }
    .slider-arrow.next { right: 10px; }
    .slider-arrow::before { top: 12px; }
    .slider-arrow.prev::before { left: 15px; }
    .slider-arrow.next::before { right: 15px; }
    .entry-grid,
    .feature-grid,
    .product-grid,
    .review-grid,
    .support-grid,
    .faq-summary-grid {
        grid-template-columns: 1fr;
    }
    .welcome-card,
    .hero-copy,
    .notice-card { padding: 24px 20px; }
    .hero-media,
    .media-panel { padding: 12px; }
    .app-points,
    .security-points { grid-template-columns: 1fr; }
    .steps-list li { grid-template-columns: 1fr; gap: 5px; }
    .footer-grid { grid-template-columns: 1fr 1fr; gap: 24px; }
    .footer-brand { grid-column: 1 / -1; }
    .footer-grid > div:last-child { grid-column: auto; }
    .footer-bottom { flex-direction: column; gap: 4px; }
}