* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --header-height: 100px;
    --header-collapsed-height: 64px;
    --section-padding-x: clamp(16px, 4vw, 48px);
    --section-padding-y: clamp(24px, 4vw, 48px);
}

html,
body {
    width: 100%;
    overflow-x: hidden;
    min-height: 100%;
}

body {
    overflow-x: hidden;
    position: relative;
    min-height: 100%;
    background: #fff;
}

.section {
    width: 100%;
    min-height: 100vh;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 30px;
    color: white;
    flex-shrink: 0;
    overflow: hidden;
    padding: var(--section-padding-y) var(--section-padding-x);
}

.section1 {
    background: #fff;
}

.section2 {
    background: #e9e9e9;
}

.section3 {
    background: #fff;
}

.section4 {
    background: #fff;
}

.section5 {
    background: #fff;
}

.section6 {
    background: #fff;
}

.section7 {
    background: #fff;
    min-height: 300px;
    height: 300px;
    padding: 0;
}

.section8 {
    background: #fff;
}

header.container {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    transform: none;
    z-index: 999;
    background: rgba(255, 255, 255, 0.4);
    width: 100%;
    max-width: 100%;
    padding: 0;
    margin: 0;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    display: flex;
    justify-content: center;
    padding: 0 clamp(12px, 3vw, 32px);
    transition: background 0.3s ease, box-shadow 0.3s ease, padding 0.3s ease;
}

.header-inner {
    width: min(1200px, 100%);
    display: flex;
    justify-content: center;
    align-items: stretch;
    position: relative;
}

.menu-panel {
    width: 100%;
}

.container .navbar-nav {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: nowrap;
    margin: 0 auto;
    gap: 0;
    transition: min-height 0.3s ease, gap 0.3s ease;
}

.container .navbar-nav .nav-item {
    display: flex;
    align-items: center;
    cursor: pointer;
    position: relative;
    transition: min-height 0.3s ease, padding 0.3s ease, background-color 0.2s ease, border-color 0.2s ease;
    font-size: 14px;
}

.container .navbar-nav .nav-item:first-child {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: var(--header-height);
    transition: min-height 0.3s ease, opacity 0.3s ease;
}

.nav-logo {
    width: 250px;
    height: auto;
    margin-right: 5px;
    display: block;
}

.container .navbar-nav .nav-item:not(:first-child) {
    width: 118px;
    min-height: var(--header-height);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding-top: 2px;
    padding-inline: 8px;
    text-align: center;
}

.nav-label {
    color: #333;
}

.nav-item.active {
    background-color: #f4f4f4;
    border-top: 4px solid #0081a2;
}

.nav-item.active div:last-child {
    color: #0081a2;
}

.nav-item.active::after {
    content: "";
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 0;
    border-left: 6px solid transparent;
    border-right: 6px solid transparent;
    border-top: 6px solid #0081a2;
}

.nav-item.hover {
    background-color: #f4f4f4;
    border-top: 4px solid #0081a2;
}

.nav-item.hover div:last-child {
    color: #0081a2;
}

.nav-item.hover::after {
    content: "";
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 0;
    border-left: 6px solid transparent;
    border-right: 6px solid transparent;
    border-top: 6px solid #0081a2;
}

.nav-icon {
    width: 70px;
    height: 40px;
    background-image: url('../img/sprite.png');
    background-repeat: no-repeat;
    transition: background-position 0.2s ease, opacity 0.3s ease, transform 0.3s ease, height 0.3s ease, margin 0.3s ease;
}

.nav-dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    width: 470px;
    height: 180px;
    display: none;
    background: #fff;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
    z-index: 1000;
}

.nav-item:hover .nav-dropdown {
    display: flex;
}

.nav-dropdown-menu {
    width: 25%;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    background: #f5f5f5;
}

.nav-dropdown-label {
    padding: 8px 12px;
    cursor: pointer;
    font-size: 13px;
    color: #333;
    transition: color 0.2s;
}

.nav-dropdown-label:hover,
.nav-dropdown-label.active {
    color: #00aeba;
}

.nav-dropdown-preview {
    width: 75%;
    padding: 10px;
    overflow: hidden;
}

.nav-dropdown-preview img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.container .navbar-nav .nav-item.mobile-only {
    display: none;
}

.menu-toggle {
    display: none;
    position: absolute;
    top: 50%;
    right: 0;
    /* transform: translateY(-50%); */
    width: 44px;
    height: 44px;
    border: none;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.7);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
    padding: 10px 9px;
    z-index: 1001;
}

.menu-toggle span {
    display: block;
    width: 100%;
    height: 2px;
    background: #1f2a37;
    border-radius: 999px;
    transition: transform 0.25s ease, opacity 0.25s ease;
}

.menu-toggle span + span {
    margin-top: 6px;
}

header.container.is-condensed {
    background: rgba(255, 255, 255, 0.7);
}

header.container.is-condensed .navbar-nav .nav-item:first-child {
    min-height: var(--header-collapsed-height);
}

header.container.is-condensed .navbar-nav .nav-item:not(:first-child) {
    min-height: var(--header-collapsed-height);
    padding-top: 0;
}

header.container.is-condensed .nav-icon {
    opacity: 0;
    transform: translateY(-10px) scale(0.75);
    height: 0;
    margin: 0;
    pointer-events: none;
}

header.container.is-condensed .nav-item:not(:first-child) {
    justify-content: center;
}

header.container.is-condensed .nav-item:not(:first-child) div:last-child {
    margin-top: 0;
}

.main-wrapper {
    min-height: 100vh;
    position: relative;
}

.sections-container {
    height: 100%;
}

.section2 {
    color: #333;
    position: relative;
    justify-content: flex-start;
}

.about-layout {
    width: 100%;
    max-width: 1400px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: clamp(24px, 3vw, 48px);
    min-height: 100vh;
}

.about-content {
    flex: 0 0 50%;
    display: flex;
    flex-direction: column;
    gap: clamp(12px, 2vw, 24px);
    padding-top: var(--header-collapsed-height);
    padding-left: clamp(24px, 6vw, 96px);
    padding-right: clamp(20px, 3vw, 48px);
}

.about-mark {
    width: min(100%, 380px);
    display: block;
}

.about-main {
    display: flex;
    align-items: flex-start;
    gap: clamp(12px, 2vw, 24px);
}

.about-badge-stack {
    width: min(160px, 28vw);
    display: grid;
    gap: 6px;
    flex-shrink: 0;
    margin-right: 20px;
}

.about-badge {
    width: 72px;
    height: 72px;
}

.about-badge-stack .badge-row {
    display: flex;
}

.about-badge-stack .badge-row.align-end {
    justify-content: flex-end;
}

.about-badge-stack .badge-row.align-start {
    justify-content: flex-start;
}

.about-text {
    flex: 1 1 auto;
}

.about-title {
    font-size: 24px;
    line-height: 1.3;
    color: #333;
    margin-bottom: 16px;
}

.about-description {
    font-size: clamp(15px, 1.4vw, 18px);
    font-size: 14px;
    color: #000;
    line-height: 2;
    text-align: justify;
}

.about-more {
    width: 33px;
    height: 33px;
    border: 1px solid #b0a99e;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: #b0a99e;
    cursor: pointer;
    margin-top: 8px;
    transition: color 0.2s, border-color 0.2s;
}
.about-more:hover {
    color: #0081a2;
    border-color: #0081a2;
}

.about-bg {
    width: 50vw;
    max-width: 50vw;
    height: 100vh;
    object-fit: cover;
    display: block;
    flex: 0 0 50vw;
}

@media (max-width: 1199px) {
    :root {
        --header-height: 88px;
        --header-collapsed-height: 60px;
    }

    .container .navbar-nav .nav-item:not(:first-child) {
        width: 100px;
    }

    .nav-icon {
        transform: scale(0.9);
    }
}

@media (max-width: 991px) {
    :root {
        --header-height: 0px;
        --section-padding-x: 20px;
        --section-padding-y: 24px;
    }

    html,
    body {
        overflow-y: hidden;
        height: 100%;
    }

    header.container {
        background: transparent;
        box-shadow: none;
        padding: 16px;
    }

    .header-inner {
        width: 100%;
        justify-content: flex-end;
        min-height: 0;
    }

    .menu-toggle {
        display: block;
        pointer-events: auto;
    }

    .menu-panel {
        position: absolute;
        top: 0;
        right: 0;
        width: min(300px, calc(100vw - 32px));
        opacity: 0;
        visibility: hidden;
        transform: translateY(-8px) scale(0.98);
        transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s ease;
        pointer-events: none;
    }

    header.container.menu-open .menu-panel {
        opacity: 1;
        visibility: visible;
        transform: translateY(0) scale(1);
        pointer-events: auto;
    }

    header.container.menu-open .menu-toggle span:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }

    header.container.menu-open .menu-toggle span:nth-child(2) {
        opacity: 0;
    }

    header.container.menu-open .menu-toggle span:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }

    .container .navbar-nav {
        width: 100%;
        flex-direction: column;
        align-items: stretch;
        justify-content: flex-start;
        gap: 0;
        padding: 12px 0;
        background: rgba(255, 255, 255, 0.96);
        border-radius: 18px;
        box-shadow: 0 18px 48px rgba(0, 0, 0, 0.18);
        overflow: hidden;
    }

    .container .navbar-nav .nav-item:first-child {
        min-height: auto;
        padding: 0 20px 12px;
        justify-content: flex-start;
    }

    .container .navbar-nav .nav-item:first-child img {
        width: 168px !important;
    }

    .container .navbar-nav .nav-item:not(:first-child) {
        width: 100%;
        min-width: 0;
        min-height: 0;
        font-size: 14px;
        flex-direction: row;
        justify-content: flex-start;
        gap: 12px;
        padding: 14px 20px;
        border-top: none;
    }

    .nav-item.active,
    .nav-item.hover {
        border-top: none;
        background-color: rgba(0, 129, 162, 0.08);
    }

    .nav-item.active::after,
    .nav-item.hover::after {
        display: none;
    }

    .nav-icon {
        transform: scale(0.78);
        margin-bottom: 0;
        opacity: 1;
        height: 40px;
    }

    .nav-dropdown {
        display: none !important;
    }

    .container .navbar-nav .nav-item.mobile-only {
        display: flex;
    }

    .section {
        min-height: auto;
        height: auto;
    }

    .about-layout {
        flex-direction: column;
        align-items: stretch;
        min-height: 100%;
        justify-content: center;
    }

    .about-content {
        order: 2;
        flex: 1 1 auto;
        padding: 0;
    }

    .about-bg {
        order: 1;
        width: min(100%, 520px);
        max-width: 100%;
        height: auto;
        margin-inline: auto;
        flex: 0 0 auto;
    }

    .main-wrapper {
        height: 100vh;
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
    }

    .sections-container {
        height: auto;
    }
}

@media (max-width: 767px) {
    :root {
        --header-collapsed-height: 56px;
        --section-padding-x: 16px;
        --section-padding-y: 20px;
    }

    header.container {
        padding: 12px;
    }

    .menu-panel {
        width: min(280px, calc(100vw - 24px));
    }

    .container .navbar-nav .nav-item:first-child img {
        width: 136px !important;
    }

    .section {
        font-size: 22px;
    }

    .about-main {
        flex-direction: column;
    }

    .about-badge-stack {
        width: 100%;
        grid-template-columns: repeat(3, minmax(0, 1fr));
        gap: 10px;
    }

    .about-badge-stack .badge-row {
        justify-content: center;
    }

    .about-badge-stack .badge-row.align-end {
        justify-content: center;
    }

    .about-badge {
        width: min(100%, 82px);
        height: auto;
        aspect-ratio: 1 / 1;
    }

    .about-description {
        line-height: 1.8;
    }

    .side-tools {
        display: none !important;
    }
}

/* 右侧悬浮工具栏 */
.side-tools {
    position: fixed;
    right: 1%;
    top: 50%;
    transform: translateY(-50%);
    width: 50px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    z-index: 998;
}

.side-tools-item {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 4px 0;
}

.side-tools-icon {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    display: block;
}

.side-tools-tip {
    position: absolute;
    right: 100%;
    top: 50%;
    transform: translateY(-50%);
    margin-right: 8px;
    background: #fff;
    border: 1px solid #ddd;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.12);
    border-radius: 4px;
    padding: 8px 12px;
    font-size: 13px;
    color: #333;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s, visibility 0.2s;
    pointer-events: none;
}

.side-tools-item:hover .side-tools-tip {
    opacity: 1;
    visibility: visible;
}

.side-tools-tip-img {
    width: 105px;
    height: 105px;
    display: block;
}

/* ===== mobile home ===== */
.mobile-home {
    display: none;
}

@media (max-width: 991px) {
    .sections-container {
        display: none;
    }

    .mobile-home {
        display: block;
    }

    .mh-carousel {
        position: relative;
        width: 100%;
    }

    .mh-carousel-img {
        width: 100%;
        height: auto;
        display: none;
    }

    .mh-carousel-img.active {
        display: block;
    }

    .mh-section {
        padding: 32px 20px;
        text-align: center;
    }

    .mh-logo {
        width: 120px;
        height: auto;
        margin: 0 auto 20px;
    }

    .mh-title {
        font-size: 22px;
        font-weight: bold;
        color: #333;
        margin-bottom: 8px;
    }

    .mh-subtitle {
        font-size: 14px;
        color: #999;
        margin-bottom: 16px;
    }

    .mh-desc {
        font-size: 14px;
        color: #666;
        line-height: 1.8;
        margin: 0;
        text-align: left;
    }

    .mh-cards {
        display: flex;
        flex-direction: column;
    }

    .mh-card {
        position: relative;
        width: 100%;
        overflow: hidden;
    }

    .mh-card-bg {
        width: 100%;
        height: auto;
        display: block;
    }

    .mh-card-overlay {
        position: absolute;
        inset: 0;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        padding: 20px;
    }

    .mh-card-icon {
        width: 48px;
        height: 48px;
        margin-bottom: 12px;
    }

    .mh-card-text {
        font-size: 13px;
        color: #fff;
        text-align: center;
        line-height: 1.6;
        margin: 0;
        text-align: left;
    }

    .mh-row {
        display: flex;
    }

    .mh-row img {
        width: 50%;
        height: auto;
        display: block;
    }

    .mh-img-row {
        display: flex;
        gap: 10px;
        padding: 0 16px;
    }

    .mh-img-row img {
        flex: 1;
        min-width: 0;
        height: auto;
        display: block;
        border-radius: 4px;
    }

    .mh-icon-row {
        display: flex;
        justify-content: space-around;
        padding: 24px 16px;
    }

    .mh-icon-item {
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 8px;
    }

    .mh-icon-item img {
        width: 60px;
        height: 60px;
        object-fit: contain;
    }

    .mh-icon-item span {
        font-size: 13px;
        color: #333;
    }

    .mh-contact {
        background-size: cover;
        background-position: center;
        padding: 32px 16px;
        text-align: center;
    }

    .mh-contact .mh-logo {
        filter: brightness(10);
    }

    .mh-contact-grid {
        display: flex;
        justify-content: center;
        gap: 12px;
        margin-top: 20px;
        flex-wrap: wrap;
    }

    .mh-contact-grid-3 .mh-contact-item {
        width: 30%;
    }

    .mh-contact-grid-2 .mh-contact-item {
        width: 40%;
    }

    .mh-contact-item {
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 8px;
    }

    .mh-contact-item img {
        width: 48px;
        height: 48px;
        object-fit: contain;
    }

    .mh-contact-item span {
        font-size: 12px;
        color: #fff;
        line-height: 1.6;
        text-align: center;
    }

    .mh-map {
        width: 100%;
    }

    .mh-footer {
        background: #292929;
        padding: 20px 16px;
        text-align: center;
        font-size: 12px;
        color: #939393;
        line-height: 2;
    }

    .mh-footer img {
        height: 14px;
        display: inline-block;
        vertical-align: middle;
    }
}