:root {
    --bg: #07111f;
    --bg-deep: #0a1528;
    --panel: rgba(11, 20, 38, 0.92);
    --panel-2: rgba(22, 34, 63, 0.94);
    --text: #eef5ff;
    --muted: #abc0dd;
    --accent: #65d8ff;
    --accent-2: #7d88ff;
    --border: rgba(255, 255, 255, 0.1);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    font-family: Arial, Helvetica, sans-serif;
    line-height: 1.7;
    color: var(--text);
    background:
        radial-gradient(circle at top, rgba(82, 130, 216, 0.35), transparent 20%),
        linear-gradient(180deg, #06101d 0%, #091425 100%);
}

main {
    flex: 1;
}

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

a {
    text-decoration: none;
}


.container {
    width: min(1140px, calc(100% - 32px));
    margin: 0 auto;
}


.site-header {
    position: sticky;
    top: 0;
    z-index: 10;
    backdrop-filter: blur(12px);
    background: rgba(6, 15, 28, 0.88);
    border-bottom: 1px solid var(--border);
}

.nav-wrap {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 14px 0;
}

.brand img {
    width: 180px;
}

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

.nav-item {
    position: relative;
}

.site-nav a,
.submenu-panel a {
    color: var(--muted);
    font-size: 0.92rem;
    font-weight: 700;
}

.site-nav a:hover,
.site-nav a.active,
.submenu-panel a:hover {
    color: var(--accent);
}

.submenu-panel {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    display: none;
    min-width: 290px;
    padding: 10px;
    flex-direction: column;
    gap: 8px;
    background: rgba(8, 17, 31, 0.98);
    border: 1px solid var(--border);
    border-radius: 14px;
    box-shadow: 0 20px 42px rgba(0, 0, 0, 0.32);
}

.has-submenu:hover .submenu-panel,
.has-submenu:focus-within .submenu-panel,
.has-submenu.open .submenu-panel {
    display: flex;
}

.submenu-panel a {
    display: block;
    padding: 10px 12px;
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.03);
}

.nav-toggle {
    display: none;
    padding: 7px 11px;
    border: 1px solid var(--border);
    background: transparent;
    color: var(--text);
}

.hero {
    padding: 72px 0 48px;
}

.hero-home {
    background:
        linear-gradient(90deg, rgba(5, 13, 25, 0.9), rgba(5, 13, 25, 0.55)),
        url('img/bg_home.png') center/cover no-repeat;
}

.hero-grid,
.detail-grid,
.split-layout,
.product-grid {
    display: grid;
    gap: 22px;
}

.hero-grid {
    grid-template-columns: 1.5fr 0.9fr;
    align-items: start;
}

.detail-grid {
    grid-template-columns: 1.2fr 0.8fr;
    align-items: start;
}

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

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

.eyebrow {
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.14em;
    font-size: 0.78rem;
    font-weight: 700;
}

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

h1 {
    font-size: clamp(2rem, 4vw, 3.8rem);
    line-height: 1.15;
}

.lead,
.card p,
.page-card p,
.page-card li,
.product-card p,
.check-list li {
    color: var(--muted);
}

.hero-card,
.card,
.page-card,
.media-card,
.product-card {
    background: linear-gradient(180deg, rgba(18, 30, 55, 0.92), rgba(8, 16, 30, 0.98));
    border: 1px solid var(--border);
    border-radius: 18px;
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.28);
}

.hero-card,
.page-card,
.card,
.product-card {
    padding: 24px;
}

.hero-pill {
    display: inline-block;
    padding: 5px 10px;
    border-radius: 999px;
    background: rgba(101, 216, 255, 0.12);
    color: var(--accent);
    font-size: 0.74rem;
    font-weight: 700;
}

.hero-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-top: 24px;
}

.button {
    display: inline-block;
    padding: 12px 18px;
    border-radius: 999px;
    font-weight: 700;
}

.button.primary {
    background: linear-gradient(90deg, var(--accent), var(--accent-2));
    color: #05101d;
}

.button.secondary {
    border: 1px solid var(--border);
    color: var(--text);
}

.section {
    padding: 40px 0 72px;
}

.alt-section {
    background: linear-gradient(180deg, rgba(101, 216, 255, 0.03), transparent);
}

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

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

.card-glow {
    position: relative;
    overflow: hidden;
}

.card-glow::after {
    content: '';
    position: absolute;
    inset: -1px;
    border-radius: 18px;
    background: linear-gradient(135deg, rgba(101, 216, 255, 0.18), transparent 30%, rgba(125, 136, 255, 0.16));
    pointer-events: none;
}

.icon-wrap {
    width: 64px;
    height: 64px;
    border-radius: 14px;
    display: grid;
    place-items: center;
    background: rgba(255, 255, 255, 0.05);
    margin-bottom: 16px;
}

.icon-wrap img {
    width: 42px;
}

.card a,
.product-card a {
    color: var(--accent);
    font-weight: 700;
}

.page-hero {
    padding: 54px 0 22px;
}

.page-hero--profile {
    background: linear-gradient(90deg, rgba(6, 16, 29, 0.92), rgba(6, 16, 29, 0.45)), url('img/bg_intro.png') center/cover no-repeat;
}

.page-hero--products {
    background: linear-gradient(90deg, rgba(6, 16, 29, 0.92), rgba(6, 16, 29, 0.45)), url('img/bg_prod.png') center/cover no-repeat;
}

.page-hero--future {
    background: linear-gradient(90deg, rgba(6, 16, 29, 0.92), rgba(6, 16, 29, 0.45)), url('img/bg_contact.png') center/cover no-repeat;
}

.page-card ul,
.check-list {
    padding-left: 18px;
}

.media-card {
    padding: 12px;
}

.media-card img {
    min-height: 300px;
    object-fit: cover;
    border-radius: 12px;
}

.submenu {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: 12px;
}

.submenu a {
    display: inline-block;
    padding: 8px 12px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border);
    color: var(--text);
}

.site-footer {
    border-top: 1px solid var(--border);
    padding: 24px 0 32px;
    color: var(--muted);
}

.footer-wrap {
    display: flex;
    justify-content: space-between;
    gap: 16px;
}

@media (max-width: 860px) {

    .hero-grid,
    .detail-grid,
    .split-layout,
    .cards-grid,
    .product-grid {
        grid-template-columns: 1fr;
    }

    .nav-toggle {
        display: block;
    }

    .site-nav {
        display: none;
        width: 100%;
        flex-direction: column;
        align-items: flex-start;
        padding-top: 10px;
    }

    .site-nav.open {
        display: flex;
    }

    .nav-item {
        width: 100%;
    }

    .submenu-panel {
        position: static;
        width: 100%;
        min-width: 0;
        margin-top: 8px;
    }

    .nav-wrap {
        flex-wrap: wrap;
    }
}

.dropdown {
    position: relative;
    display: inline-block;
}

/* 2. 触发按钮样式 */
.dropbtn {
    background-color: transparent;
    color: var(--muted);
    font-size: 0.92rem;
    font-weight: 700;
    padding: 12px 20px;
    font-size: 16px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s;
}

/* 3. 下拉菜单面板：默认隐藏 */
.dropdown-content {
    display: none;
    /* 默认不显示 */
    position: absolute;
    top: 100%;
    /* 显示在按钮正下方 */
    left: 0;
    background-color: #333333;
    min-width: 160px;
    box-shadow: 0px 8px 16px 0px rgba(0, 0, 0, 0.2);
    border-radius: 4px;
    overflow: hidden;
    z-index: 10;
}

/* 4. 下拉选项样式 */
.dropdown-content a {
    color: var(--muted);
    padding: 12px 16px;
    text-decoration: none;
    display: block;
    transition: background-color 0.2s;
}

/* 5. 鼠标悬停在选项上的背景高亮 */
.dropdown-content a:hover {
    background-color: #333333;
}

/* 核心实现：当鼠标指针移入 .dropdown 容器时，让 .dropdown-content 显示 */
.dropdown:hover .dropdown-content {
    display: block;
}

/* 鼠标悬停在按钮上时改变按钮颜色 */
.dropdown:hover .dropbtn {
    background-color: transparent;
    color: var(--accent);
}