.site-nav__action {
    padding: 10px 16px;
    border-radius: var(--radius-xs);
    font-weight: 600;
    color: var(--color-neutral-700);
    background: transparent;
    border: none;
    cursor: pointer;
    transition: color 0.2s ease, background 0.2s ease, transform 0.2s ease;
}

.site-nav__action--primary {
    background: rgba(75, 163, 247, 0.12);
    color: var(--color-ocean-700);
}

.site-nav__action--outline {
    background: rgba(75, 163, 247, 0.12);
    color: var(--color-ocean-700);
}

/* Global palette */
:root {
    --color-sky-50: #f5faff;
    --color-sky-100: #e4f2ff;
    --color-sky-200: #c9e5ff;
    --color-sky-300: #a9d5ff;
    --color-sky-500: #4ba3f7;
    --color-sky-600: #2a7fd7;
    --color-ocean-700: #155b9a;
    --color-deep: #0f2e4c;
    --color-neutral-50: #ffffff;
    --color-neutral-100: #f3f6f9;
    --color-neutral-300: #d8e2ec;
    --color-neutral-500: #708399;
    --color-neutral-700: #37536f;
    --shadow-soft: 0 16px 40px -24px rgba(21, 91, 154, 0.6);
    --shadow-card: 0 24px 60px -30px rgba(15, 46, 76, 0.45);
    --radius-lg: 32px;
    --radius-md: 20px;
    --radius-sm: 12px;
    --radius-xs: 8px;
    scroll-behavior: smooth;
}

* {
    box-sizing: border-box;
}

html, body {
    min-height: 100%;
}

body {
    margin: 0;
    font-family: 'Manrope', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    color: var(--color-deep);
    background: radial-gradient(circle at top left, rgba(200, 229, 255, 0.55), transparent 45%),
                radial-gradient(circle at 120% 20%, rgba(173, 216, 255, 0.55), transparent 30%),
                linear-gradient(180deg, var(--color-sky-50) 0%, #ffffff 100%);
    line-height: 1.6;
}

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

img {
    max-width: 100%;
    display: block;
    border-radius: var(--radius-md);
}

.shell {
    width: min(1200px, calc(100% - 48px));
    margin: 0 auto;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    -webkit-backdrop-filter: blur(16px);
    backdrop-filter: blur(16px);
    background: rgba(255, 255, 255, 0.72);
    border-bottom: 1px solid rgba(200, 225, 255, 0.5);
}

.site-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 0;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    font-weight: 700;
    color: var(--color-deep);
}

.brand__mark {
    display: block;
    width: 48px;
    height: 48px;
    padding: 6px;
    border-radius: 14px;
    background:
        radial-gradient(circle at 28% 28%, rgba(255, 255, 255, 0.22), transparent 65%),
        linear-gradient(140deg, rgba(13, 31, 63, 0.92), rgba(31, 78, 134, 0.85));
    box-shadow: 0 18px 36px -20px rgba(13, 31, 63, 0.75);
    box-sizing: border-box;
    object-fit: contain;
}

.brand__text {
    display: flex;
    flex-direction: column;
    line-height: 1.1;
}

.brand__name {
    font-size: 1.4rem;
}

.brand__tagline {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-neutral-500);
}

.site-nav {
    display: flex;
    align-items: center;
    gap: 18px;
}

.site-nav__links {
    display: flex;
    align-items: center;
    gap: 18px;
}

.site-nav__burger {
    display: none;
    width: 42px;
    height: 42px;
    border-radius: 10px;
    border: none;
    background: rgba(75, 163, 247, 0.12);
    color: var(--color-ocean-700);
    cursor: pointer;
    align-items: center;
    justify-content: center;
    transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease;
}

.site-nav__burger:hover,
.site-nav__burger:focus-visible {
    background: rgba(75, 163, 247, 0.18);
    transform: translateY(-1px);
    outline: none;
}

.site-nav__link {
    padding: 10px 16px;
    border-radius: var(--radius-xs);
    font-weight: 600;
    color: var(--color-neutral-700);
    transition: color 0.2s ease, background 0.2s ease, transform 0.2s ease;
}

.site-nav__link--gateway {
    background: transparent;
    border: none;
    cursor: pointer;
    font: inherit;
    color: inherit;
    appearance: none;
}

.site-nav__link--toggle {
    background: var(--color-sky-100);
    border: none;
    cursor: pointer;
    font: inherit;
    color: var(--color-ocean-700);
}

.site-nav__link:hover,
.site-nav__link:focus-visible,
.site-nav__action:hover,
.site-nav__action:focus-visible,
.site-nav__link--toggle:hover,
.site-nav__link--toggle:focus-visible {
    color: var(--color-ocean-700);
    background: rgba(75, 163, 247, 0.12);
    outline: none;
    transform: translateY(-1px);
}

.site-main {
    padding-bottom: 96px;
}

.hero {
    padding: 96px 0 72px;
}

.hero__layout {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 48px;
    align-items: center;
}

.hero__content {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.hero__eyebrow {
    font-size: 0.95rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--color-sky-600);
}

.hero__title {
    font-size: clamp(2.75rem, 5vw, 3.8rem);
    margin: 0;
    color: var(--color-deep);
}

.hero__subtitle {
    font-size: 1.2rem;
    margin: 0;
    color: var(--color-neutral-700);
}

.hero__description {
    margin: 0;
    color: var(--color-neutral-500);
}

.hero__meta {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.meta-chip {
    display: inline-flex;
    flex-direction: column;
    gap: 6px;
    padding: 16px 18px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, rgba(75, 163, 247, 0.18), rgba(42, 127, 215, 0.12));
    color: var(--color-ocean-700);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.4);
}

.meta-chip__label {
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.meta-chip__value {
    font-size: 1.1rem;
    font-weight: 700;
}

.hero__actions {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-top: 8px;
}

.action-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 180px;
    padding: 14px 26px;
    border-radius: 999px;
    font-weight: 700;
    border: none;
    cursor: pointer;
    transition: transform 0.25s ease, box-shadow 0.25s ease, background 0.25s ease;
}

.action-button--primary {
    background: linear-gradient(135deg, var(--color-sky-500), var(--color-sky-600));
    color: #fff;
    box-shadow: var(--shadow-soft);
}

.action-button--primary:hover,
.action-button--primary:focus-visible {
    transform: translateY(-2px);
    box-shadow: 0 20px 45px -30px rgba(42, 127, 215, 0.9);
    outline: none;
}

.action-button--outline {
    background: rgba(75, 163, 247, 0.12);
    color: var(--color-sky-600);
    border: 1px solid rgba(75, 163, 247, 0.2);
}

.action-button--outline:hover,
.action-button--outline:focus-visible {
    transform: translateY(-1px);
    background: rgba(75, 163, 247, 0.18);
    outline: none;
}

.hero__stats-card {
    position: relative;
    padding: 32px;
    border-radius: var(--radius-lg);
    background: rgba(255, 255, 255, 0.85);
    box-shadow: var(--shadow-card);
    -webkit-backdrop-filter: blur(30px);
    backdrop-filter: blur(30px);
}

.hero__video {
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: #000;
    box-shadow: var(--shadow-card);
    margin-left: -20px;
}

.hero__video-media {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero__stats-card::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    background: linear-gradient(135deg, rgba(75, 163, 247, 0.14), rgba(21, 91, 154, 0.08));
    z-index: -1;
}

.stats-snippet {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
}

.stats-snippet__item {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.stats-snippet__value {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--color-ocean-700);
}

.stats-snippet__label {
    font-size: 0.95rem;
    color: var(--color-neutral-500);
    font-weight: 600;
}

.stats-snippet__note {
    margin-top: 24px;
    font-size: 0.85rem;
    color: var(--color-neutral-500);
}

.section {
    padding: 72px 0;
}

.section__header {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 32px;
}

.section__eyebrow {
    font-size: 0.82rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.16em;
    color: var(--color-sky-600);
}

.section__title {
    margin: 0;
    font-size: clamp(2rem, 4vw, 2.6rem);
    color: var(--color-deep);
}

.section__subtitle {
    margin: 0;
    color: var(--color-neutral-500);
    max-width: 650px;
}

.media-carousel {
    position: relative;
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: 12px;
}

.media-carousel__viewport {
    overflow: hidden;
    border-radius: var(--radius-lg);
    background: rgba(255, 255, 255, 0.85);
    box-shadow: var(--shadow-card);
}

.media-carousel__track {
    display: flex;
    transition: transform 0.6s cubic-bezier(0.19, 1, 0.22, 1);
    height: 100%;
}

.media-carousel__slide {
    min-width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    cursor: pointer;
}

.media-carousel__slide img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s ease;
}

.media-carousel__slide:hover img {
    transform: scale(1.02);
}

.media-carousel__nav {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: none;
    background: rgba(75, 163, 247, 0.15);
    color: var(--color-sky-600);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.25s ease, background 0.25s ease, color 0.25s ease;
}

.media-carousel__nav:hover,
.media-carousel__nav:focus-visible {
    transform: translateY(-2px);
    background: rgba(75, 163, 247, 0.25);
    color: var(--color-ocean-700);
    outline: none;
}

.media-carousel__nav:disabled {
    opacity: 0.35;
    pointer-events: none;
}

.media-carousel__dots {
    position: absolute;
    bottom: 16px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
    background: rgba(255, 255, 255, 0.65);
    padding: 8px 14px;
    border-radius: 999px;
    -webkit-backdrop-filter: blur(16px);
    backdrop-filter: blur(16px);
}

.media-carousel__dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    border: none;
    background: rgba(75, 163, 247, 0.35);
    cursor: pointer;
    transition: background 0.2s ease, transform 0.2s ease;
}

.media-carousel__dot.is-active {
    background: var(--color-sky-600);
    transform: scale(1.25);
}

.media-carousel__slide--empty {
    padding: 64px 24px;
    cursor: default;
}

.empty-state {
    text-align: center;
    color: var(--color-neutral-500);
}

.empty-state__icon {
    font-size: 2rem;
    margin-bottom: 12px;
    color: var(--color-sky-600);
}

.empty-state__title {
    font-size: 1.2rem;
    font-weight: 700;
    margin: 0 0 6px;
}

.empty-state__subtitle {
    margin: 0;
    font-size: 0.95rem;
}

.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 24px;
}

.metric {
    padding: 24px 26px;
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.9);
    box-shadow: 0 12px 38px -28px rgba(15, 46, 76, 0.6);
    border: 1px solid rgba(200, 225, 255, 0.45);
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.metric__value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-ocean-700);
}

.metric__label {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-neutral-500);
}

.gateway-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.gateway-card {
    position: relative;
    padding: 28px;
    border-radius: var(--radius-lg);
    background: rgba(255, 255, 255, 0.9);
    border: 1px solid rgba(200, 225, 255, 0.45);
    box-shadow: var(--shadow-card);
    display: flex;
    gap: 24px;
    align-items: center;
    cursor: pointer;
    transition: transform 0.35s ease, box-shadow 0.35s ease, border-color 0.35s ease;
}

.gateway-card:hover,
.gateway-card:focus-visible {
    transform: translateY(-6px);
    border-color: rgba(75, 163, 247, 0.55);
    box-shadow: 0 26px 65px -40px rgba(42, 127, 215, 0.65);
    outline: none;
}

.gateway-card__icon {
    width: 60px;
    height: 60px;
    border-radius: 18px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--color-neutral-50);
    background: linear-gradient(135deg, var(--color-sky-500), var(--color-sky-600));
    box-shadow: 0 20px 35px -25px rgba(75, 163, 247, 0.75);
}

.gateway-card--rail .gateway-card__icon {
    background: linear-gradient(135deg, #3db9ff, #2a7fd7);
}

.gateway-card__body {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.gateway-card__title {
    margin: 0;
    font-size: 1.4rem;
    color: var(--color-deep);
}

.gateway-card__description {
    margin: 0;
    color: var(--color-neutral-500);
}

.gateway-card__cta {
    margin-top: 12px;
    font-weight: 700;
    color: var(--color-sky-600);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.gateway-card__cta::after {
    content: '→';
    transition: transform 0.2s ease;
}

.gateway-card:hover .gateway-card__cta::after,
.gateway-card:focus-visible .gateway-card__cta::after {
    transform: translateX(4px);
}

/* Contact Section */
.contact-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
    margin-top: 48px;
}

.contact-item {
    display: flex;
    gap: 20px;
    padding: 24px;
    background: rgba(255, 255, 255, 0.8);
    border: 1px solid rgba(200, 225, 255, 0.5);
    border-radius: var(--radius-md);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.contact-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-soft);
}

.contact-item__icon {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    width: 48px;
    height: 48px;
    min-width: 48px;
    background: rgba(75, 163, 247, 0.12);
    border-radius: var(--radius-sm);
    color: var(--color-sky-600);
    font-size: 24px;
    flex-shrink: 0;
}

.contact-item__icon .fa-solid,
.contact-item__icon .fa-brands {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
}

.contact-item__content {
    flex: 1;
}

.contact-item__title {
    margin: 0 0 8px 0;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-deep);
}

.contact-item__description {
    margin: 0;
    color: var(--color-neutral-500);
    font-size: 0.95rem;
}

.contact-item__link {
    color: var(--color-sky-600);
    font-weight: 500;
    text-decoration: none;
    transition: color 0.2s ease;
}

.contact-item__link:hover,
.contact-item__link:focus-visible {
    color: var(--color-ocean-700);
    outline: none;
}

.contact-item__text {
    color: var(--color-deep);
    font-weight: 500;
}

.site-footer {
    padding: 36px 0 48px;
    background: rgba(10, 42, 69, 0.05);
    border-top: 1px solid rgba(200, 225, 255, 0.45);
}

.site-footer__inner {
    display: flex;
    flex-direction: column;
    gap: 10px;
    text-align: center;
    color: var(--color-neutral-500);
    font-size: 0.92rem;
}

.site-footer__link {
    color: var(--color-sky-600);
    font-weight: 600;
    transition: color 0.2s ease;
}

.site-footer__link:hover,
.site-footer__link:focus-visible {
    color: var(--color-ocean-700);
    outline: none;
}

/* Responsive adjustments */
@media (max-width: 960px) {
    .site-header__inner {
        flex-direction: row;
        gap: 12px;
        text-align: initial;
    }

    .brand__mark {
        width: 44px;
        height: 44px;
    }

    .brand__name {
        font-size: 1.25rem;
    }

    .site-nav {
        gap: 8px;
        position: relative;
    }

    .site-nav__burger {
        display: inline-flex;
    }

    .site-nav__links {
        position: absolute;
        right: 0;
        top: calc(100% + 10px);
        display: none;
        flex-direction: column;
        gap: 8px;
        padding: 12px;
        border-radius: var(--radius-md);
        background: rgba(255, 255, 255, 0.96);
        border: 1px solid rgba(200, 225, 255, 0.55);
        box-shadow: var(--shadow-card);
        min-width: 240px;
        z-index: 10;
    }

    .site-nav__links[data-open="true"] {
        display: flex;
    }

    .site-nav__link {
        padding: 10px 12px;
    }

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

    .hero__video {
        margin-bottom: 16px;
    }

    .hero__video {
        order: -1;
    }

    .media-carousel {
        grid-template-columns: 1fr;
    }

    .media-carousel__nav {
        position: absolute;
        top: 50%;
        transform: translateY(-50%);
    }

    .media-carousel__nav--prev {
        left: 18px;
    }

    .media-carousel__nav--next {
        right: 18px;
    }

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

@media (max-width: 640px) {
    .shell {
        width: min(100%, calc(100% - 32px));
    }

    .brand__mark {
        width: 40px;
        height: 40px;
    }

    .brand__name {
        font-size: 1.15rem;
    }

    .hero {
        padding: 72px 0 56px;
    }

    .hero__video-media {
        height: 100%;
    }

    .hero__actions {
        flex-direction: column;
    }

    .stats-snippet {
        grid-template-columns: 1fr;
    }

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

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

    .contact-info {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .contact-item {
        flex-direction: column;
        text-align: center;
        align-items: center;
        gap: 16px;
    }

    .contact-item__icon {
        margin: 0 auto;
    }

    .media-carousel__nav {
        width: 42px;
        height: 42px;
    }
}

/* 公告栏样式 */
.announcement-popup {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    pointer-events: none;
}

.announcement-popup.is-visible {
    pointer-events: auto;
}

.announcement-popup__overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.3);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.announcement-popup.is-visible .announcement-popup__overlay {
    opacity: 1;
}

.announcement-popup__content {
    position: relative;
    width: 100%;
    max-width: 800px;
    max-height: 90vh;
    background: rgba(255, 255, 255, 0.85);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
    border-radius: var(--radius-md);
    box-shadow: 0 24px 60px -30px rgba(15, 46, 76, 0.45);
    padding: 32px;
    overflow-y: auto;
    transform: scale(0.95);
    opacity: 0;
    transition: transform 0.3s ease, opacity 0.3s ease;
    pointer-events: auto;
}

.announcement-popup.is-visible .announcement-popup__content {
    transform: scale(1);
    opacity: 1;
}

.announcement-popup__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid rgba(200, 225, 255, 0.5);
}

.announcement-popup__title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-deep);
    margin: 0;
}

.announcement-popup__close {
    width: 32px;
    height: 32px;
    border: none;
    background: transparent;
    color: var(--color-neutral-500);
    font-size: 1.5rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: background 0.2s ease, color 0.2s ease;
}

.announcement-popup__close:hover {
    background: rgba(75, 163, 247, 0.12);
    color: var(--color-ocean-700);
}

.announcement-popup__body {
    color: var(--color-neutral-700);
    line-height: 1.8;
}

.announcement-popup__body h3 {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-deep);
    margin: 24px 0 12px;
}

.announcement-popup__body h3:first-child {
    margin-top: 0;
}

.announcement-popup__body p {
    margin: 12px 0;
    color: var(--color-neutral-700);
}

.announcement-popup__body ul {
    margin: 12px 0;
    padding-left: 24px;
}

.announcement-popup__body li {
    margin: 8px 0;
    color: var(--color-neutral-700);
}

@media (max-width: 640px) {
    .announcement-popup__content {
        padding: 24px 20px;
        max-width: 95%;
    }

    .announcement-popup__title {
        font-size: 1.3rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}