:root {
    --bg: #F4FBFF;
    --surface: #FFFFFF;
    --soft: #E8F7FF;
    --primary: #11AEEA;
    --accent: #1688D8;
    --deep: #155A9D;
    --text: #24384A;
    --muted: #60758A;
    --border: rgba(17, 174, 234, 0.18);
    --footer: #073A68;
    --footer-text: #EAF8FF;
    --gradient: linear-gradient(135deg, #35D7FF 0%, #1688D8 100%);
    --shadow: 0 18px 50px rgba(21, 90, 157, 0.12);
    --shadow-soft: 0 10px 30px rgba(21, 90, 157, 0.08);
    --radius-lg: 28px;
    --radius-md: 20px;
    --radius-sm: 14px;
    --header-height: 76px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    min-width: 320px;
    overflow-x: hidden;
    background: var(--bg);
    color: var(--text);
    font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", Arial, sans-serif;
    line-height: 1.75;
    -webkit-font-smoothing: antialiased;
}

body.drawer-open {
    overflow: hidden;
}

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

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

button,
input,
textarea,
select {
    font: inherit;
}

button {
    cursor: pointer;
}

h1,
h2,
h3,
p {
    margin-top: 0;
}

h1,
h2,
h3 {
    color: var(--deep);
    line-height: 1.25;
}

h1 {
    font-size: clamp(2.2rem, 5vw, 4.8rem);
    letter-spacing: -0.04em;
}

h2 {
    font-size: clamp(1.7rem, 3.2vw, 2.8rem);
    letter-spacing: -0.025em;
}

h3 {
    font-size: clamp(1.08rem, 1.6vw, 1.35rem);
}

p {
    color: var(--muted);
}

.container {
    width: min(100% - 32px, 1240px);
    margin-inline: auto;
}

.skip-link {
    position: fixed;
    left: 16px;
    top: -60px;
    z-index: 1200;
    padding: 10px 16px;
    border-radius: 10px;
    background: var(--deep);
    color: #fff;
    transition: top .2s ease;
}

.skip-link:focus {
    top: 10px;
}

.site-header {
    position: fixed;
    inset: 0 0 auto;
    z-index: 1000;
    height: var(--header-height);
    border-bottom: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.94);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
}

.header-shell {
    width: min(100% - 32px, 1360px);
    height: 100%;
    margin-inline: auto;
    display: flex;
    align-items: center;
    gap: clamp(14px, 1.5vw, 28px);
}

.brand-logo,
.drawer-logo,
.footer-logo {
    flex: 0 0 auto;
    display: inline-flex;
    align-items: center;
}

.brand-logo img {
    width: clamp(94px, 8vw, 128px);
    max-height: 48px;
    object-fit: contain;
}

.desktop-nav {
    flex: 1 1 auto;
    min-width: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: clamp(9px, 1vw, 18px);
}

.desktop-nav a {
    position: relative;
    flex: 0 0 auto;
    padding: 25px 0 22px;
    color: var(--text);
    font-size: clamp(.82rem, .83vw, .95rem);
    font-weight: 700;
    line-height: 1;
    white-space: nowrap;
    transition: color .2s ease;
}

.desktop-nav a::after {
    position: absolute;
    right: 0;
    bottom: 15px;
    left: 0;
    height: 3px;
    border-radius: 99px;
    background: var(--gradient);
    content: "";
    opacity: 0;
    transform: scaleX(.4);
    transition: .2s ease;
}

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

.desktop-nav a:hover::after,
.desktop-nav a.is-active::after {
    opacity: 1;
    transform: scaleX(1);
}

.header-actions {
    flex: 0 0 auto;
    display: flex;
    align-items: center;
    gap: 10px;
}

.main-btn,
.text-btn {
    display: inline-flex;
    min-height: 44px;
    align-items: center;
    justify-content: center;
    border-radius: 999px;
    padding: 10px 22px;
    font-weight: 800;
    white-space: nowrap;
    transition: transform .2s ease, box-shadow .2s ease, opacity .2s ease;
}

.main-btn {
    border: 0;
    background: var(--gradient);
    box-shadow: 0 10px 24px rgba(22, 136, 216, .22);
    color: #fff;
}

.main-btn:hover,
.text-btn:hover {
    transform: translateY(-2px);
}

.main-btn:hover {
    box-shadow: 0 14px 30px rgba(22, 136, 216, .3);
}

.text-btn {
    border: 1px solid var(--border);
    background: rgba(255, 255, 255, .75);
    color: var(--deep);
}

.menu-toggle {
    display: none;
    width: 46px;
    height: 46px;
    border: 1px solid var(--border);
    border-radius: 14px;
    background: #fff;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 5px;
}

.menu-toggle span {
    width: 21px;
    height: 2px;
    border-radius: 99px;
    background: var(--deep);
}

.site-main {
    padding-top: var(--header-height);
}

.drawer-overlay {
    position: fixed;
    inset: 0;
    z-index: 1040;
    background: rgba(7, 58, 104, .42);
    opacity: 0;
    transition: opacity .25s ease;
}

.drawer-overlay.is-visible {
    opacity: 1;
}

.mobile-drawer {
    position: fixed;
    top: 0;
    right: 0;
    z-index: 1050;
    width: min(88vw, 390px);
    height: 100dvh;
    padding: 20px;
    overflow-y: auto;
    background: #fff;
    box-shadow: -24px 0 60px rgba(7, 58, 104, .22);
    transform: translateX(104%);
    transition: transform .28s ease;
}

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

.drawer-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    padding-bottom: 18px;
    border-bottom: 1px solid var(--border);
}

.drawer-logo img {
    width: 112px;
    max-height: 44px;
    object-fit: contain;
}

.drawer-close {
    width: 42px;
    height: 42px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--soft);
    color: var(--deep);
    font-size: 1.75rem;
    line-height: 1;
}

.mobile-nav {
    display: grid;
    gap: 4px;
    padding: 18px 0;
}

.mobile-nav a {
    display: flex;
    min-height: 48px;
    align-items: center;
    justify-content: space-between;
    border-radius: 12px;
    padding: 9px 13px;
    color: var(--text);
    font-weight: 700;
}

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

.mobile-nav span {
    color: var(--primary);
    font-size: 1.35rem;
}

.drawer-register {
    width: 100%;
}

.hero-slider-section {
    padding: clamp(18px, 3vw, 34px) 0 0;
}

.hero-slider {
    position: relative;
    overflow: hidden;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    background: var(--soft);
    box-shadow: var(--shadow);
    isolation: isolate;
}

.slider-track {
    position: relative;
    aspect-ratio: 1920 / 720;
    min-height: 210px;
}

.slide {
    position: absolute;
    inset: 0;
    opacity: 0;
    visibility: hidden;
    transition: opacity .55s ease, visibility .55s ease;
}

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

.slide img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    background: var(--soft);
}

.slider-arrow {
    position: absolute;
    top: 50%;
    z-index: 3;
    width: clamp(40px, 5vw, 54px);
    height: clamp(40px, 5vw, 54px);
    border: 1px solid rgba(255, 255, 255, .72);
    border-radius: 50%;
    background: rgba(7, 58, 104, .48);
    color: #fff;
    font-size: 1.65rem;
    line-height: 1;
    transform: translateY(-50%);
    backdrop-filter: blur(10px);
}

.slider-arrow:hover {
    background: rgba(22, 136, 216, .88);
}

.slider-arrow--prev { left: clamp(10px, 2vw, 24px); }
.slider-arrow--next { right: clamp(10px, 2vw, 24px); }

.slider-dots {
    position: absolute;
    right: 0;
    bottom: clamp(10px, 2vw, 20px);
    left: 0;
    z-index: 3;
    display: flex;
    justify-content: center;
    gap: 9px;
}

.slider-dot {
    width: 10px;
    height: 10px;
    border: 0;
    border-radius: 999px;
    padding: 0;
    background: rgba(255, 255, 255, .72);
    box-shadow: 0 2px 8px rgba(7, 58, 104, .18);
    transition: width .2s ease, background .2s ease;
}

.slider-dot.is-active {
    width: 28px;
    background: #fff;
}

.page-hero {
    position: relative;
    overflow: hidden;
    padding: clamp(74px, 9vw, 130px) 0 clamp(64px, 8vw, 105px);
    background:
        radial-gradient(circle at 85% 18%, rgba(53, 215, 255, .2), transparent 27%),
        radial-gradient(circle at 10% 90%, rgba(22, 136, 216, .12), transparent 34%),
        linear-gradient(180deg, #fff 0%, var(--bg) 100%);
}

.page-hero::before,
.page-hero::after {
    position: absolute;
    border: 1px solid rgba(17, 174, 234, .12);
    border-radius: 50%;
    content: "";
}

.page-hero::before {
    width: 420px;
    height: 420px;
    right: -190px;
    top: -230px;
}

.page-hero::after {
    width: 250px;
    height: 250px;
    left: -110px;
    bottom: -150px;
}

.page-hero__inner {
    position: relative;
    z-index: 1;
    max-width: 900px;
    text-align: center;
}

.page-hero h1 {
    margin-bottom: 22px;
    background: linear-gradient(135deg, var(--primary), var(--deep));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.page-hero__lead {
    max-width: 760px;
    margin: 0 auto 30px;
    color: var(--text);
    font-size: clamp(1rem, 1.8vw, 1.25rem);
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
}

.eyebrow {
    margin-bottom: 10px;
    color: var(--primary);
    font-size: .82rem;
    font-weight: 900;
    letter-spacing: .16em;
    text-transform: uppercase;
}

.section {
    padding: clamp(64px, 8vw, 112px) 0;
}

.section--soft {
    background: var(--soft);
}

.section--white {
    background: #fff;
}

.section-heading {
    max-width: 760px;
    margin-bottom: clamp(30px, 5vw, 52px);
}

.section-heading--center {
    margin-right: auto;
    margin-left: auto;
    text-align: center;
}

.section-heading h2 {
    margin-bottom: 16px;
}

.section-heading p:last-child {
    margin-bottom: 0;
}

.split-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.04fr) minmax(320px, .96fr);
    align-items: center;
    gap: clamp(32px, 6vw, 80px);
}

.split-layout--reverse .media-frame {
    order: -1;
}

.media-frame {
    overflow: hidden;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    background: #fff;
    box-shadow: var(--shadow);
}

.media-frame img {
    width: 100%;
    max-height: 560px;
    object-fit: contain;
    background: #fff;
}

.media-caption {
    padding: 16px 20px;
    border-top: 1px solid var(--border);
    color: var(--muted);
    font-size: .92rem;
}

.content-copy p {
    margin-bottom: 18px;
}

.content-copy .hero-actions {
    justify-content: flex-start;
    margin-top: 26px;
}

.feature-grid,
.quick-grid,
.review-grid,
.product-grid,
.notice-grid,
.contact-grid {
    display: grid;
    gap: 20px;
}

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

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

.product-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

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

.notice-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

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

.feature-card,
.quick-card,
.product-card,
.review-card,
.notice-card,
.step-card,
.contact-card {
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: var(--surface);
    box-shadow: var(--shadow-soft);
}

.feature-card,
.product-card,
.notice-card,
.contact-card {
    padding: clamp(22px, 3vw, 32px);
}

.feature-card h3,
.product-card h3,
.notice-card h3,
.contact-card h3 {
    margin-bottom: 12px;
}

.feature-card p:last-child,
.product-card p:last-child,
.notice-card p:last-child,
.contact-card p:last-child {
    margin-bottom: 0;
}

.card-index,
.step-number {
    display: inline-flex;
    width: 42px;
    height: 42px;
    align-items: center;
    justify-content: center;
    margin-bottom: 18px;
    border-radius: 13px;
    background: var(--soft);
    color: var(--accent);
    font-weight: 900;
}

.quick-card {
    display: flex;
    min-height: 220px;
    flex-direction: column;
    padding: 24px;
    transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease;
}

.quick-card:hover {
    border-color: rgba(17, 174, 234, .42);
    box-shadow: var(--shadow);
    transform: translateY(-5px);
}

.quick-card h3 {
    margin-bottom: 11px;
}

.quick-card p {
    flex: 1;
    margin-bottom: 18px;
    font-size: .94rem;
}

.card-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--accent);
    font-weight: 800;
}

.card-link::after {
    content: "→";
    transition: transform .2s ease;
}

.card-link:hover::after {
    transform: translateX(4px);
}

.product-card--media {
    overflow: hidden;
    padding: 0;
}

.product-card--media img {
    width: 100%;
    aspect-ratio: 16 / 10;
    object-fit: contain;
    background: var(--soft);
}

.product-card__body {
    padding: 22px;
}

.tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 20px 0 0;
    padding: 0;
    list-style: none;
}

.tag-list li {
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 6px 12px;
    background: var(--soft);
    color: var(--deep);
    font-size: .88rem;
    font-weight: 700;
}

.steps {
    counter-reset: step;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
}

.step-card {
    padding: 28px;
}

.step-card p:last-child {
    margin-bottom: 0;
}

.review-card {
    position: relative;
    min-height: 250px;
    padding: 32px;
}

.review-card__mark {
    margin-bottom: 8px;
    color: rgba(17, 174, 234, .28);
    font-family: Georgia, serif;
    font-size: 4.4rem;
    line-height: .7;
}

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

.review-card strong {
    display: block;
    margin-top: 20px;
    color: var(--accent);
}

.info-banner,
.compliance-card {
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    background: linear-gradient(135deg, rgba(255,255,255,.98), rgba(232,247,255,.92));
    box-shadow: var(--shadow);
}

.info-banner {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 28px;
    padding: clamp(28px, 5vw, 52px);
}

.info-banner p:last-child {
    margin-bottom: 0;
}

.compliance-section {
    padding-top: 0;
}

.compliance-card {
    display: grid;
    grid-template-columns: minmax(240px, .65fr) minmax(0, 1.35fr);
    align-items: center;
    gap: clamp(24px, 5vw, 56px);
    padding: clamp(28px, 5vw, 52px);
}

.compliance-card h2,
.compliance-card p {
    margin-bottom: 0;
}

.faq-list {
    display: grid;
    gap: 14px;
}

.faq-item {
    overflow: hidden;
    border: 1px solid var(--border);
    border-radius: 16px;
    background: #fff;
    box-shadow: var(--shadow-soft);
}

.faq-item summary {
    display: flex;
    min-height: 64px;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    padding: 18px 22px;
    color: var(--deep);
    font-weight: 800;
    cursor: pointer;
    list-style: none;
}

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

.faq-item summary::after {
    flex: 0 0 auto;
    color: var(--primary);
    content: "+";
    font-size: 1.5rem;
}

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

.faq-answer {
    padding: 0 22px 20px;
}

.faq-answer p:last-child {
    margin-bottom: 0;
}

.alert-box {
    border-left: 5px solid var(--primary);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    padding: 24px 28px;
    background: #fff;
    box-shadow: var(--shadow-soft);
}

.alert-box h2,
.alert-box h3 {
    margin-bottom: 10px;
}

.alert-box p:last-child {
    margin-bottom: 0;
}

.content-list {
    display: grid;
    gap: 14px;
    margin: 24px 0 0;
    padding: 0;
    list-style: none;
}

.content-list li {
    position: relative;
    padding-left: 28px;
    color: var(--muted);
}

.content-list li::before {
    position: absolute;
    top: .55em;
    left: 0;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--gradient);
    box-shadow: 0 0 0 5px rgba(17, 174, 234, .1);
    content: "";
}

.site-footer {
    padding: 64px 0 24px;
    background: var(--footer);
    color: var(--footer-text);
}

.footer-grid {
    display: grid;
    grid-template-columns: minmax(260px, 1.5fr) repeat(3, minmax(150px, .7fr));
    gap: clamp(28px, 5vw, 64px);
}

.footer-logo img {
    width: 124px;
    max-height: 48px;
    object-fit: contain;
    filter: brightness(0) invert(1);
}

.footer-brand p {
    max-width: 430px;
    margin-top: 20px;
    color: rgba(234, 248, 255, .78);
}

.site-footer h2 {
    margin-bottom: 18px;
    color: #fff;
    font-size: 1rem;
}

.site-footer a:not(.footer-logo) {
    display: block;
    margin: 9px 0;
    color: rgba(234, 248, 255, .82);
    font-size: .93rem;
}

.site-footer a:hover {
    color: #fff;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    gap: 24px;
    margin-top: 46px;
    padding-top: 22px;
    border-top: 1px solid rgba(234, 248, 255, .15);
}

.footer-bottom p {
    margin-bottom: 0;
    color: rgba(234, 248, 255, .68);
    font-size: .86rem;
}

@media (max-width: 1180px) {
    .desktop-nav {
        display: none;
    }

    .menu-toggle {
        display: inline-flex;
    }

    .header-shell {
        justify-content: space-between;
    }
}

@media (max-width: 1024px) {
    .quick-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .product-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .feature-grid,
    .review-grid,
    .contact-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .split-layout {
        grid-template-columns: 1fr;
    }

    .split-layout--reverse .media-frame {
        order: 0;
    }

    .media-frame {
        max-width: 760px;
        margin-inline: auto;
    }

    .footer-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 760px) {
    :root {
        --header-height: 68px;
        --radius-lg: 22px;
    }

    .container,
    .header-shell {
        width: min(100% - 24px, 1240px);
    }

    .brand-logo img {
        width: 96px;
        max-height: 42px;
    }

    .header-register {
        min-height: 40px;
        padding: 8px 17px;
    }

    .menu-toggle {
        width: 42px;
        height: 42px;
    }

    .hero-slider-section {
        padding-top: 12px;
    }

    .slider-track {
        min-height: 160px;
    }

    .slider-arrow {
        width: 38px;
        height: 38px;
        font-size: 1.3rem;
    }

    .section {
        padding: 58px 0;
    }

    .page-hero {
        padding: 66px 0 64px;
    }

    .feature-grid,
    .quick-grid,
    .product-grid,
    .review-grid,
    .notice-grid,
    .steps,
    .contact-grid,
    .compliance-card,
    .info-banner {
        grid-template-columns: 1fr;
    }

    .quick-card {
        min-height: 0;
    }

    .review-card {
        min-height: 0;
    }

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

    .footer-brand {
        grid-column: 1 / -1;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 8px;
    }
}

@media (max-width: 480px) {
    .header-actions {
        gap: 7px;
    }

    .header-register {
        padding-inline: 14px;
    }

    .slider-track {
        min-height: 138px;
    }

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

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;
        animation-duration: .01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: .01ms !important;
    }
}