@font-face {
    font-family: "Noto Sans SC";
    font-style: normal;
    font-weight: 400;
    font-display: swap;
    src: url("../fonts/NotoSansSC-400.woff2") format("woff2");
}

@font-face {
    font-family: "Noto Sans SC";
    font-style: normal;
    font-weight: 700;
    font-display: swap;
    src: url("../fonts/NotoSansSC-700.woff2") format("woff2");
}

:root,
[data-bs-theme="light"],
[data-bs-theme="dark"] {
    --bs-font-sans-serif: "Noto Sans SC", "Microsoft YaHei", "微软雅黑", "PingFang SC", "Hiragino Sans GB", "Microsoft JhengHei", sans-serif;
}

.demo-site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    width: 100%;
    /* 页面顶部：略实底，几乎无磨砂 */
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(0px);
    -webkit-backdrop-filter: blur(0px);
    border-bottom: 1px solid rgba(243, 244, 246, 1);
    box-shadow: none;
    transition: background 0.35s cubic-bezier(0.4, 0, 0.2, 1), backdrop-filter 0.35s ease,
        -webkit-backdrop-filter 0.35s ease, border-color 0.35s ease, box-shadow 0.35s ease;
}

/* 滚动后：对齐 Tailwind bg-white/80 backdrop-blur-xl + 轻微浮起 */
.demo-site-header.demo-site-header--scrolled {
    background: rgba(255, 255, 255, 0.78);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border-bottom-color: rgba(229, 231, 235, 0.9);
    box-shadow: 0 1px 0 rgba(255, 255, 255, 0.6) inset, 0 4px 24px rgba(15, 23, 42, 0.06);
}

@media (prefers-reduced-motion: reduce) {
    .demo-site-header {
        transition: none;
    }

    .demo-site-header.demo-site-header--scrolled {
        /* 仍应用毛玻璃，只是取消过渡 */
        background: rgba(255, 255, 255, 0.78);
        backdrop-filter: blur(24px);
        -webkit-backdrop-filter: blur(24px);
    }
}

.demo-site-header__inner {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 16px;
    width: 100%;
    box-sizing: border-box;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

@media (min-width: 768px) {
    .demo-site-header__inner {
        padding: 0 32px;
    }
}

/* Logo */
.demo-site-header__brand {
    display: flex;
    align-items: center;
    gap: 8px;
    z-index: 50;
    position: relative;
    text-decoration: none;
    color: inherit;
}

.demo-site-header__logo-mark {
    width: 36px;
    height: 36px;
    background: #2563eb;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
    flex-shrink: 0;
}

.demo-site-header__logo-mark span {
    color: #fff;
    font-weight: 900;
    font-size: 18px;
    line-height: 1;
    font-family: var(--bs-font-sans-serif);
}

.demo-site-header__site-name {
    font-size: 22px;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: #0f172a;
    margin-left: 4px;
}

.demo-site-header__logo-img {
    max-height: 36px;
    width: auto;
    display: block;
    object-fit: contain;
}

/* 主导航 */
.demo-site-header__nav {
    display: none;
    align-items: stretch;
    height: 100%;
    gap: 32px;
}

@media (min-width: 768px) {
    .demo-site-header__nav {
        display: flex;
    }
}

.demo-site-header__nav-link {
    display: flex;
    align-items: center;
    height: 100%;
    font-size: 14px;
    font-weight: 700;
    color: #4b5563;
    text-decoration: none;
    transition: color 0.15s ease;
    position: relative;
    padding: 0 2px;
}

.demo-site-header__nav-link:hover {
    color: #2563eb;
}

.demo-site-header__nav-link--active {
    color: #2563eb;
}

.demo-site-header__nav-link--active::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: #2563eb;
    border-radius: 9999px 9999px 0 0;
}

/* 有下拉的触发器 */
.demo-site-header__nav-item {
    position: relative;
    display: flex;
    align-items: stretch;
    height: 100%;
}

/* 下拉桥接区：避免鼠标从导航移到 fixed 下拉时因 1~2px 空隙导致失焦 */
.demo-site-header__nav-item--mega::after {
    content: "";
    position: absolute;
    left: -8px;
    right: -8px;
    top: 100%;
    height: 12px;
}

.demo-site-header__nav-trigger {
    display: flex;
    align-items: center;
    gap: 4px;
    height: 100%;
    padding: 0 2px;
    font-size: 14px;
    font-weight: 700;
    color: #4b5563;
    background: none;
    border: none;
    cursor: pointer;
    font-family: inherit;
    transition: color 0.2s ease;
    text-decoration: none;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

.demo-site-header__nav-item:hover .demo-site-header__nav-trigger,
.demo-site-header__nav-item:focus-within .demo-site-header__nav-trigger {
    color: #2563eb;
}

.demo-site-header__chev {
    width: 16px;
    height: 16px;
    transition: transform 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.demo-site-header__nav-item:hover .demo-site-header__chev,
.demo-site-header__nav-item:focus-within .demo-site-header__chev {
    transform: rotate(-180deg);
}

/* Mega 全宽下拉 — 对齐 group-hover transition-all duration-300 */
.demo-site-mega {
    position: fixed;
    left: 0;
    right: 0;
    /* 精确贴合 72px 顶栏并覆盖其底边线，避免视觉缝隙 */
    top: calc(72px - 1px);
    z-index: 40;
    background: #fff;
    border-top: 0;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.15);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    pointer-events: none;
}

.demo-site-header__nav-item:hover .demo-site-mega,
.demo-site-header__nav-item:focus-within .demo-site-mega {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
}

@media (hover: none) {
    .demo-site-header__nav-item:hover .demo-site-mega {
        opacity: 0;
        visibility: hidden;
        pointer-events: none;
    }

    .demo-site-header__nav-item.is-open .demo-site-mega,
    .demo-site-header__nav-item--mega.is-open .demo-site-mega {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
        pointer-events: auto;
    }
}

.demo-site-mega__inner {
    max-width: 1280px;
    margin: 0 auto;
    padding: 40px 16px 40px;
    box-sizing: border-box;
}

@media (min-width: 768px) {
    .demo-site-mega__inner {
        padding-left: 32px;
        padding-right: 32px;
    }
}

.demo-site-mega__head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 32px;
    padding-bottom: 16px;
    border-bottom: 1px solid #f3f4f6;
}

.demo-site-mega__title {
    margin: 0;
    font-size: 20px;
    font-weight: 700;
    color: #111827;
}

.demo-site-mega__desc {
    margin: 4px 0 0;
    font-size: 14px;
    color: #6b7280;
}

.demo-site-mega__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
}

@media (min-width: 768px) {
    .demo-site-mega__grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (min-width: 1024px) {
    .demo-site-mega__grid--many {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .demo-site-mega__grid--few {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }
}

.demo-site-mega__card {
    display: block;
    padding: 24px;
    border-radius: 16px;
    border: 1px solid #f9fafb;
    background: rgba(249, 250, 251, 0.5);
    text-decoration: none;
    color: inherit;
    transition: background 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease, transform 0.2s ease;
}

.demo-site-mega__card:hover {
    background: #fff;
    border-color: #dbeafe;
    box-shadow: 0 8px 30px rgba(37, 99, 235, 0.08);
}

.demo-site-mega__card--active {
    background: rgba(239, 246, 255, 0.5);
    border-color: #bfdbfe;
}

.demo-site-mega__card-row {
    display: flex;
    align-items: flex-start;
    gap: 16px;
}

.demo-site-mega__icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: #eff6ff;
    color: #2563eb;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 20px;
    transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease;
}

.demo-site-mega__card:hover .demo-site-mega__icon {
    transform: scale(1.08);
    background: #2563eb;
    color: #fff;
}

.demo-site-mega__card-title {
    margin: 0 0 6px;
    font-size: 17px;
    font-weight: 700;
    color: #111827;
    transition: color 0.15s ease;
}

.demo-site-mega__card:hover .demo-site-mega__card-title {
    color: #2563eb;
}

.demo-site-mega__card-text {
    margin: 0;
    font-size: 13px;
    line-height: 1.5;
    color: #6b7280;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* 右侧操作区 */
.demo-site-header__actions {
    display: none;
    align-items: center;
    gap: 20px;
    z-index: 50;
    position: relative;
}

@media (min-width: 768px) {
    .demo-site-header__actions {
        display: flex;
    }
}

.demo-site-header__icon-btn {
    padding: 8px;
    color: #64748b;
    background: none;
    border: none;
    border-radius: 9999px;
    cursor: pointer;
    transition: color 0.15s ease, background 0.15s ease;
}

.demo-site-header__icon-btn:hover {
    color: #2563eb;
    background: #f8fafc;
}

.demo-site-header__divider {
    width: 1px;
    height: 16px;
    background: #e5e7eb;
}

.demo-site-header__link {
    font-size: 15px;
    font-weight: 500;
    color: #475569;
    text-decoration: none;
    transition: color 0.15s ease;
}

.demo-site-header__link:hover {
    color: #2563eb;
}

.demo-site-header__cta {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 8px 20px;
    font-size: 15px;
    font-weight: 500;
    color: #fff;
    background: #2563eb;
    border: none;
    border-radius: 9999px;
    text-decoration: none;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.2);
    transition: background 0.15s ease, box-shadow 0.15s ease;
}

.demo-site-header__cta:hover {
    background: #1d4ed8;
    box-shadow: 0 6px 16px rgba(37, 99, 235, 0.3);
}

/* 移动端菜单按钮 */
.demo-site-header__mob-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 8px;
    background: none;
    border: none;
    color: #6b7280;
    cursor: pointer;
    z-index: 50;
}

@media (min-width: 768px) {
    .demo-site-header__mob-btn {
        display: none;
    }
}

.demo-site-header__mob-panel {
    display: none;
    position: fixed;
    inset: 72px 0 0;
    z-index: 60;
    background: #fff;
    overflow: auto;
    padding: 16px;
    border-top: 1px solid #f3f4f6;
    box-sizing: border-box;
}

.demo-site-header__mob-panel.is-open {
    display: block;
}

.demo-site-header__mob-panel a {
    display: block;
    padding: 12px 16px;
    font-weight: 700;
    color: #374151;
    text-decoration: none;
    border-radius: 8px;
}

.demo-site-header__mob-panel a:hover {
    background: #f9fafb;
    color: #2563eb;
}

.demo-site-header__mob-sub {
    padding-left: 16px;
    font-weight: 500;
    font-size: 14px;
}

@media (prefers-reduced-motion: reduce) {
    .demo-site-mega,
    .demo-site-header__chev,
    .demo-site-mega__icon {
        transition: none;
    }
}