/* ===== 设计变量 ===== */
:root {
    --site-color-primary: #4f67e8;
    --site-color-primary-dark: #3f52c4;
    --site-color-primary-soft: #eef1ff;
    --site-color-accent: #16a394;
    --site-color-accent-dark: #117d72;
    --site-color-success: #168f66;
    --site-color-danger: #d92d20;
    --site-color-warning: #dc6803;

    --site-color-page: #f5f7fb;
    --site-color-surface: #ffffff;
    --site-color-surface-soft: #f9fafb;
    --site-color-text: #172033;
    --site-color-text-secondary: #344054;
    --site-color-text-navigation: #475467;
    --site-color-text-muted: #667085;
    --site-color-text-subtle: #98a2b3;
    --site-color-border: #e4e7ec;
    --site-color-border-strong: #d0d5dd;

    --site-color-danger-text: #b42318;
    --site-color-danger-soft: #fffbfa;
    --site-color-danger-border: #fecdca;
    --site-color-success-text: #067647;
    --site-color-success-soft: #ecfdf3;
    --site-color-success-border: #abefc6;
    --site-color-warning-text: #9a3412;
    --site-color-warning-soft: #fff7ed;
    --site-color-warning-border: #fedf89;
    --site-color-map: #e9eef5;

    --site-space-1: 4px;
    --site-space-2: 8px;
    --site-space-3: 12px;
    --site-space-4: 16px;
    --site-space-5: 20px;
    --site-space-6: 24px;
    --site-space-8: 32px;
    --site-space-10: 40px;
    --site-space-12: 48px;
    --site-space-16: 64px;

    --site-radius-sm: 10px;
    --site-radius-md: 14px;
    --site-radius-lg: 18px;
    --site-radius-xl: 24px;
    --site-radius-pill: 999px;

    --site-shadow-sm: 0 1px 3px rgba(16, 24, 40, 0.08), 0 1px 2px rgba(16, 24, 40, 0.04);
    --site-shadow-md: 0 10px 30px rgba(16, 24, 40, 0.08);
    --site-shadow-lg: 0 24px 64px rgba(16, 24, 40, 0.12);
    --site-shadow-button: 0 8px 18px rgba(79, 103, 232, 0.2);
    --site-shadow-button-hover: 0 12px 28px rgba(79, 103, 232, 0.28);
    --site-focus-ring: 0 0 0 4px rgba(79, 103, 232, 0.18);
    --site-focus-ring-danger: 0 0 0 3px rgba(217, 45, 32, 0.1);

    --site-gradient-primary: linear-gradient(135deg, var(--site-color-primary), #687cf0);
    --site-gradient-primary-hover: linear-gradient(135deg, var(--site-color-primary-dark), #586cde);
    --site-surface-glass: rgba(255, 255, 255, 0.94);
    --site-border-card: rgba(208, 213, 221, 0.78);

    --site-content-width: 1120px;
    --site-query-width: 760px;
    --site-wide-width: 1480px;
    --site-article-width: 860px;
    --site-tool-width: 960px;
    --site-admin-width: 820px;
    --site-header-height: 60px;
    --site-control-height: 46px;
    --site-touch-target: 44px;

    --site-font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
    --site-transition-fast: 160ms ease;
    --site-transition-base: 240ms ease;
}

/* ===== 基础重置与可访问性 ===== */
:where(html) {
    color-scheme: light;
    font-family: var(--site-font-sans);
    -webkit-text-size-adjust: 100%;
}

:where(*, *::before, *::after) {
    box-sizing: border-box;
}

:where(img, svg, video, canvas) {
    max-width: 100%;
}

:where(button, input, select, textarea) {
    font: inherit;
}

:where(a, button, input, select, textarea, [tabindex]):focus-visible {
    outline: 3px solid rgba(79, 103, 232, 0.42);
    outline-offset: 2px;
}

:where(.site-visually-hidden) {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    white-space: nowrap !important;
    border: 0 !important;
}

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

/* ===== 全站公共组件 ===== */
/* 全站可复用组件层：页面文件只负责布局与业务差异。 */
.site-page {
    min-height: 100vh;
    margin: 0;
    color: var(--site-color-text);
    background-color: var(--site-color-page);
    font-family: var(--site-font-sans);
    text-align: left;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.site-surface {
    border: 1px solid var(--site-border-card);
    background: var(--site-surface-glass);
    box-shadow: var(--site-shadow-md);
}

/* 轻量文本符号替代旧图标字体，避免为少量图标加载整套字体与组件库。 */
.site-symbol {
    display: inline-flex;
    flex: 0 0 auto;
    align-items: center;
    justify-content: center;
    font-family: Arial, "Microsoft YaHei", sans-serif;
    font-style: normal;
    line-height: 1;
}

.site-eyebrow {
    display: inline-flex;
    align-items: center;
    min-height: 30px;
    padding: 5px 12px;
    color: var(--site-color-primary-dark);
    border: 1px solid rgba(79, 103, 232, 0.18);
    border-radius: var(--site-radius-pill);
    background: var(--site-color-primary-soft);
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.04em;
}

.site-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--site-space-2);
    min-height: var(--site-touch-target);
    padding: 9px 16px;
    border: 1px solid transparent;
    border-radius: var(--site-radius-md);
    font-weight: 700;
    line-height: 1.4;
    text-align: center;
    text-decoration: none;
    cursor: pointer;
    transition: color var(--site-transition-fast), background var(--site-transition-fast), border-color var(--site-transition-fast), box-shadow var(--site-transition-fast), transform var(--site-transition-fast);
}

.site-button:hover,
.site-button:focus-visible {
    text-decoration: none;
}

.site-button:active {
    transform: translateY(1px);
}

.site-button:disabled,
.site-button[aria-disabled="true"] {
    cursor: not-allowed;
    opacity: 0.62;
    box-shadow: none;
    transform: none;
}

.site-button--primary {
    color: #fff;
    background: var(--site-gradient-primary);
    box-shadow: var(--site-shadow-button);
}

.site-button--primary:hover,
.site-button--primary:focus-visible {
    color: #fff;
    background: var(--site-gradient-primary-hover);
    box-shadow: var(--site-shadow-button-hover);
}

.site-button--soft {
    color: var(--site-color-primary-dark);
    border-color: rgba(79, 103, 232, 0.18);
    background: var(--site-color-primary-soft);
}

.site-button--soft:hover,
.site-button--soft:focus-visible {
    color: var(--site-color-primary-dark);
    border-color: rgba(79, 103, 232, 0.32);
    background: #e7ebff;
}

.site-button--neutral {
    color: var(--site-color-text-secondary);
    border-color: var(--site-color-border-strong);
    background: var(--site-color-surface);
}

.site-button--neutral:hover,
.site-button--neutral:focus-visible {
    color: var(--site-color-text);
    border-color: var(--site-color-primary);
    background: var(--site-color-surface-soft);
}

.site-button--danger {
    color: var(--site-color-danger-text);
    border-color: var(--site-color-danger-border);
    background: var(--site-color-danger-soft);
}

.site-button--danger:hover,
.site-button--danger:focus-visible {
    color: #fff;
    border-color: var(--site-color-danger);
    background: var(--site-color-danger);
}

.site-control {
    width: 100%;
    min-height: var(--site-control-height);
    padding: 10px 13px;
    color: var(--site-color-text);
    border: 1px solid var(--site-color-border-strong);
    border-radius: var(--site-radius-md);
    background: var(--site-color-surface);
    box-shadow: none;
    transition: border-color var(--site-transition-fast), box-shadow var(--site-transition-fast);
}

.site-control:focus,
.site-control:focus-visible {
    border-color: var(--site-color-primary);
    outline: none;
    box-shadow: var(--site-focus-ring);
}

.site-control[aria-invalid="true"] {
    border-color: var(--site-color-danger);
    box-shadow: var(--site-focus-ring-danger);
}

.site-note {
    margin: 0;
    padding: 11px 13px;
    border-radius: var(--site-radius-sm);
    color: var(--site-color-text-muted);
    background: var(--site-color-surface-soft);
    font-size: 14px;
    line-height: 1.6;
}

.site-note--danger {
    color: var(--site-color-danger-text);
    border: 1px solid var(--site-color-danger-border);
    background: var(--site-color-danger-soft);
}

.site-note--success {
    color: var(--site-color-success-text);
    border: 1px solid var(--site-color-success-border);
    background: var(--site-color-success-soft);
}

.site-map :where(audio, canvas, img, svg, video) {
    max-width: none !important;
}

.site-map {
    position: relative;
}

.site-map .map-empty-notice {
    position: absolute;
    top: 12px;
    left: 50%;
    z-index: 1000;
    max-width: calc(100% - 112px);
    margin: 0;
    padding: 7px 12px;
    color: var(--site-color-text-secondary);
    border: 1px solid var(--site-color-border-strong);
    border-radius: var(--site-radius-pill);
    background: var(--site-surface-glass);
    box-shadow: var(--site-shadow-sm);
    font-size: 12px;
    line-height: 1.4;
    text-align: center;
    transform: translateX(-50%);
    pointer-events: none;
}

/* 百度地图把标签放在 0 宽定位层内；解除框架约束后才能保留气泡设定宽度。 */
.site-map .BMapLabel {
    max-width: none !important;
}

.map-copyright-link {
    display: inline-block;
    padding: 2px 6px;
    color: var(--site-color-text-muted);
    border-radius: 6px;
    background: rgba(255, 255, 255, 0.88);
    font-size: 12px;
}

.map-copyright-link:hover,
.map-copyright-link:focus-visible {
    color: var(--site-color-primary-dark);
    text-decoration: none;
}

@media (max-width: 640px) {
    .site-control {
        font-size: 16px;
    }
}

/* ===== 公共导航 ===== */
/* 公共导航：保留 #head、#navbar-collapse 等历史 DOM 契约。 */
#head.site-header {
    position: relative;
    z-index: 1000;
    width: 100%;
    min-height: var(--site-header-height);
    border-bottom: 1px solid rgba(228, 231, 236, 0.92);
    background: rgba(255, 255, 255, 0.94);
    box-shadow: 0 1px 2px rgba(16, 24, 40, 0.04);
    backdrop-filter: blur(16px);
}

#head .site-navbar {
    min-height: var(--site-header-height);
    margin: 0;
    border: 0;
    border-radius: 0;
    background: transparent;
}

#head .site-nav-container {
    display: flex;
    align-items: center;
    width: min(100% - 32px, var(--site-content-width));
    min-height: var(--site-header-height);
    margin: 0 auto;
}

#head .site-brand {
    display: inline-flex;
    flex: 0 0 auto;
    align-items: center;
    gap: 9px;
    height: auto;
    margin-right: 28px;
    padding: 0;
    color: var(--site-color-text);
    font-size: 17px;
    font-weight: 750;
    line-height: 1;
    letter-spacing: -0.02em;
}

#head .site-brand:hover,
#head .site-brand:focus {
    color: var(--site-color-primary-dark);
    text-decoration: none;
}

#head .site-brand-mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    color: #fff;
    border-radius: var(--site-radius-sm);
    background: linear-gradient(135deg, var(--site-color-primary), #7083f1);
    box-shadow: 0 6px 14px rgba(79, 103, 232, 0.2);
    font-size: 15px;
    font-weight: 800;
}

#head .site-nav-collapse {
    display: flex !important;
    flex: 1 1 auto;
    align-items: center;
    min-width: 0;
    padding: 0;
    border: 0;
    box-shadow: none;
}

#head .site-nav-list {
    display: flex;
    align-items: center;
    gap: 3px;
    margin: 0;
    padding: 0;
}

#head .site-nav-actions {
    margin-left: auto;
}

#head .site-nav-item {
    position: relative;
    float: none;
}

#head .site-nav-item > a,
#head .site-nav-item > button {
    display: inline-flex;
    align-items: center;
    min-height: var(--site-touch-target);
    padding: 9px 13px;
    color: var(--site-color-text-navigation);
    border: 0;
    border-radius: var(--site-radius-sm);
    background: transparent;
    cursor: pointer;
    font-family: inherit;
    font-size: 14px;
    font-weight: 560;
    line-height: 20px;
    text-decoration: none;
    transition: color var(--site-transition-fast), background var(--site-transition-fast);
}

#head .site-nav-item > a:hover,
#head .site-nav-item > a:focus,
#head .site-nav-item > button:hover,
#head .site-nav-item > button:focus {
    color: var(--site-color-primary-dark);
    background: var(--site-color-primary-soft);
    text-decoration: none;
}

#head .site-nav-item.active > a,
#head .site-nav-item.active > a:hover,
#head .site-nav-item.active > a:focus,
#head .site-nav-item.active > button,
#head .site-nav-item.active > button:hover,
#head .site-nav-item.active > button:focus {
    color: var(--site-color-primary-dark);
    background: var(--site-color-primary-soft);
    font-weight: 680;
}

#head .site-nav-item.active > a::after,
#head .site-nav-item.active > button::after {
    position: absolute;
    right: 13px;
    bottom: 3px;
    left: 13px;
    height: 2px;
    border-radius: var(--site-radius-pill);
    background: var(--site-color-primary);
    content: "";
}

#head .site-dropdown-toggle .caret {
    margin-left: 7px;
    transition: transform var(--site-transition-fast);
}

#head .site-nav-dropdown.open .caret {
    transform: rotate(180deg);
}

#head .site-dropdown-menu {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    left: auto;
    z-index: 1010;
    display: none;
    min-width: 176px;
    margin: 0;
    padding: 7px;
    border: 1px solid var(--site-color-border);
    border-radius: var(--site-radius-md);
    background: var(--site-color-surface);
    box-shadow: var(--site-shadow-md);
}

#head .site-nav-dropdown.open > .site-dropdown-menu {
    display: block;
}

#head .site-dropdown-menu > li {
    display: block;
    float: none;
    width: 100%;
}

#head .site-dropdown-menu > li > a {
    display: flex;
    align-items: center;
    min-height: var(--site-touch-target);
    padding: 9px 11px;
    color: var(--site-color-text-navigation);
    border-radius: 8px;
    font-size: 14px;
    line-height: 20px;
    text-align: left;
    white-space: nowrap;
}

#head .site-dropdown-menu > li > a:hover,
#head .site-dropdown-menu > li > a:focus {
    color: var(--site-color-primary-dark);
    background: var(--site-color-primary-soft);
    text-decoration: none;
}

#head .site-dropdown-menu > li > a[aria-current="page"] {
    color: var(--site-color-primary-dark);
    background: var(--site-color-primary-soft);
    font-weight: 700;
}

#head .site-dropdown-menu .divider {
    height: 1px;
    margin: 6px 4px;
    background: var(--site-color-border);
}

#head .site-nav-toggle {
    display: none;
    width: 44px;
    height: 44px;
    margin: 0 0 0 auto;
    padding: 9px 10px;
    border: 1px solid var(--site-color-border);
    border-radius: var(--site-radius-sm);
    background: var(--site-color-surface);
}

#head .site-nav-toggle .icon-bar {
    display: block;
    width: 22px;
    height: 2px;
    margin: 4px 0;
    border-radius: var(--site-radius-pill);
    background: var(--site-color-text-navigation);
    transition: transform var(--site-transition-fast), opacity var(--site-transition-fast);
}

#head .site-nav-toggle[aria-expanded="true"] .icon-bar:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
}

#head .site-nav-toggle[aria-expanded="true"] .icon-bar:nth-child(2) {
    opacity: 0;
}

#head .site-nav-toggle[aria-expanded="true"] .icon-bar:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
}

/* 窄桌面与平板也折叠菜单，避免导航在缩放和分屏时挤压错行。 */
@media (max-width: 900px) {
    body.site-nav-open {
        overflow: hidden;
    }

    #head .site-nav-container {
        flex-wrap: wrap;
        width: min(100% - 24px, var(--site-content-width));
    }

    #head .site-brand {
        min-height: var(--site-header-height);
        margin-right: 0;
    }

    #head .site-nav-toggle {
        display: block !important;
    }

    #head .site-nav-collapse {
        display: none !important;
        flex: 0 0 100%;
        align-items: stretch;
        padding: 6px 0 14px;
        background: transparent;
        max-height: calc(100dvh - var(--site-header-height));
        overflow-y: auto;
        overscroll-behavior: contain;
        scrollbar-gutter: stable;
    }

    #head .site-nav-collapse.in {
        display: block !important;
    }

    #head .site-nav-list {
        display: block;
        width: 100%;
    }

    #head .site-nav-actions {
        margin-left: 0;
    }

    #head .site-nav-item {
        display: block;
        width: 100%;
    }

    #head .site-nav-item > a,
    #head .site-nav-item > button {
        display: flex;
        width: 100%;
        min-height: var(--site-touch-target);
        padding: 11px 12px;
        border-radius: var(--site-radius-sm);
    }

    #head .site-nav-item.active > a::after,
    #head .site-nav-item.active > button::after {
        top: 11px;
        right: auto;
        bottom: 11px;
        left: 3px;
        width: 3px;
        height: auto;
    }

    #head .site-dropdown-menu {
        position: static;
        width: 100%;
        margin: 3px 0 7px;
        padding: 5px 5px 5px 16px;
        border: 0;
        background: var(--site-color-surface-soft);
        box-shadow: none;
    }

    #head .site-dropdown-menu > li > a {
        display: flex;
        align-items: center;
        min-height: var(--site-touch-target);
    }
}

@media (prefers-reduced-motion: reduce) {
    #head .site-nav-toggle .icon-bar,
    #head .site-dropdown-toggle .caret {
        transition: none;
    }
}

.site-skip-link {
    position: fixed;
    z-index: 1100;
    top: 10px;
    left: 12px;
    padding: 10px 14px;
    border-radius: var(--site-radius-sm);
    color: #fff;
    background: var(--site-color-primary);
    box-shadow: var(--site-shadow-md);
    font-weight: 700;
    transform: translateY(-160%);
    transition: transform 160ms ease;
}

.site-skip-link:focus {
    color: #fff;
    transform: translateY(0);
}