/* =============================================================================
   班雅化学科技 · 前台站点样式
   作用范围：首页、化学计算、化学搜索、产品、联系我们（使用 #@siteLayout() 的页面）
   所有类名以 bn- 开头，避免与 Bootstrap / layui / jfinal-com 样式互相覆盖。
   ========================================================================== */

:root {
    --bn-ink: #12304f;          /* 品牌深蓝：标题、页眉页脚 */
    --bn-ink-2: #3d566f;        /* 正文次要文字 */
    --bn-ink-3: #5f7286;        /* 辅助说明（白底对比度 ≥ 4.5） */
    --bn-paper: #f3f7f6;        /* 页面底色：略带青色的冷白 */
    --bn-surface: #ffffff;
    --bn-line: #d6e1df;
    --bn-line-strong: #b9cac7;
    --bn-teal: #0b8f79;         /* 主操作色（取自标志的青绿） */
    --bn-teal-hover: #097564;
    --bn-teal-soft: #e3f3ef;
    --bn-blue: #1c5fbf;         /* 链接 */
    --bn-warn: #9a5b00;
    --bn-warn-soft: #fff4e0;
    --bn-danger: #b3261e;

    --bn-radius-s: 6px;
    --bn-radius-m: 10px;
    --bn-shadow: 0 1px 2px rgba(18, 48, 79, .06), 0 8px 24px rgba(18, 48, 79, .06);
    --bn-wrap: 1180px;
    --bn-header-h: 64px;

    --bn-font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", "Source Han Sans SC",
               "Helvetica Neue", Arial, sans-serif;
}

/* ---------- 基础 ---------- */
*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-padding-top: calc(var(--bn-header-h) + 16px); }

body.bn-body {
    margin: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    font-family: var(--bn-font);
    font-size: 15px;
    line-height: 1.7;
    color: var(--bn-ink-2);
    background: var(--bn-paper);
    -webkit-font-smoothing: antialiased;
}

.bn-body h1, .bn-body h2, .bn-body h3, .bn-body h4 {
    margin: 0;
    color: var(--bn-ink);
    font-weight: 700;
    line-height: 1.3;
    letter-spacing: .01em;
}

.bn-body p { margin: 0; }
.bn-body ul { margin: 0; padding: 0; list-style: none; }
.bn-body a { color: var(--bn-blue); text-decoration: none; }
.bn-body a:hover { text-decoration: underline; }
.bn-body img, .bn-body svg { max-width: 100%; }
.bn-body sub, .bn-body sup { line-height: 0; }

.bn-body :focus-visible {
    outline: 3px solid rgba(11, 143, 121, .45);
    outline-offset: 2px;
    border-radius: 4px;
}

.bn-num { font-variant-numeric: tabular-nums; }
.bn-body [hidden] { display: none !important; }

.bn-wrap {
    width: 100%;
    max-width: var(--bn-wrap);
    margin: 0 auto;
    padding: 0 24px;
}

.bn-visually-hidden {
    position: absolute !important;
    width: 1px; height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
}

.bn-skip {
    position: absolute;
    left: 12px; top: -48px;
    z-index: 1100;
    padding: 8px 14px;
    background: var(--bn-ink);
    color: #fff !important;
    border-radius: var(--bn-radius-s);
}
.bn-skip:focus { top: 8px; }

.bn-main { flex: 1 0 auto; }

/* ---------- 按钮 ---------- */
.bn-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 42px;
    padding: 0 20px;
    font: inherit;
    font-size: 15px;
    font-weight: 600;
    line-height: 1;
    color: #fff !important;
    background: var(--bn-teal);
    border: 1px solid var(--bn-teal);
    border-radius: var(--bn-radius-s);
    cursor: pointer;
    text-decoration: none !important;
    white-space: nowrap;
    transition: background-color .15s, border-color .15s, color .15s;
}
.bn-btn:hover { background: var(--bn-teal-hover); border-color: var(--bn-teal-hover); }
.bn-btn:disabled, .bn-btn.is-disabled {
    cursor: not-allowed;
    color: #8a9aa9 !important;
    background: #e9eef0;
    border-color: #e9eef0;
}
.bn-btn--ghost {
    color: var(--bn-ink) !important;
    background: var(--bn-surface);
    border-color: var(--bn-line-strong);
}
.bn-btn--ghost:hover { background: var(--bn-teal-soft); border-color: var(--bn-teal); }
.bn-btn--small { min-height: 34px; padding: 0 14px; font-size: 14px; }
.bn-btn--block { width: 100%; }

/* ---------- 页眉 ---------- */
.bn-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, .96);
    border-bottom: 1px solid var(--bn-line);
    backdrop-filter: saturate(1.4) blur(8px);
    -webkit-backdrop-filter: saturate(1.4) blur(8px);
}
.bn-header__inner {
    display: flex;
    align-items: center;
    gap: 28px;
    height: var(--bn-header-h);
}
.bn-brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    flex: none;
    text-decoration: none !important;
}
.bn-brand img { width: 30px; height: 34px; }
.bn-brand__name { color: var(--bn-ink); font-size: 18px; font-weight: 700; letter-spacing: .06em; }

.bn-nav { display: flex; align-items: center; flex: 1; gap: 20px; min-width: 0; }
.bn-nav__list { display: flex; align-items: center; gap: 4px; flex: 1; }
.bn-nav__item { position: relative; }
.bn-nav__link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    height: var(--bn-header-h);
    padding: 0 12px;
    color: var(--bn-ink) !important;
    font-size: 15px;
    font-weight: 500;
    text-decoration: none !important;
    border-bottom: 3px solid transparent;
    border-top: 3px solid transparent;
}
.bn-nav__link:hover { color: var(--bn-teal) !important; }
.bn-nav__link.is-active { border-bottom-color: var(--bn-teal); font-weight: 700; }
.bn-nav__link .fa { font-size: 14px; color: var(--bn-ink-3); }

.bn-menu {
    position: absolute;
    top: calc(100% - 4px);
    left: 0;
    z-index: 10;
    min-width: 290px;
    padding: 6px !important;
    background: var(--bn-surface);
    border: 1px solid var(--bn-line);
    border-radius: var(--bn-radius-m);
    box-shadow: var(--bn-shadow);
    opacity: 0;
    visibility: hidden;
    transform: translateY(4px);
    transition: opacity .15s, transform .15s, visibility 0s .15s;
}
.bn-menu--right { left: auto; right: 0; min-width: 168px; }
.bn-nav__item--menu:hover > .bn-menu,
.bn-nav__item--menu:focus-within > .bn-menu,
.bn-nav__item--menu.is-open > .bn-menu,
.bn-user__menu:hover > .bn-menu,
.bn-user__menu:focus-within > .bn-menu,
.bn-user__menu.is-open > .bn-menu {
    opacity: 1;
    visibility: visible;
    transform: none;
    transition: opacity .15s, transform .15s;
}
.bn-menu a {
    display: flex;
    flex-direction: column;
    gap: 1px;
    padding: 9px 12px;
    color: var(--bn-ink) !important;
    border-radius: var(--bn-radius-s);
    text-decoration: none !important;
}
.bn-menu--right a { flex-direction: row; align-items: center; gap: 10px; }
.bn-menu a:hover { background: var(--bn-teal-soft); }
.bn-menu strong { font-size: 15px; font-weight: 600; }
.bn-menu span { font-size: 13px; color: var(--bn-ink-3); white-space: nowrap; }

.bn-search { position: relative; flex: 0 1 200px; margin: 0; }
.bn-search .fa { position: absolute; left: 11px; top: 50%; transform: translateY(-50%); color: var(--bn-ink-3); font-size: 14px; }
.bn-search input {
    width: 100%;
    height: 36px;
    padding: 0 12px 0 32px;
    font: inherit;
    font-size: 14px;
    color: var(--bn-ink);
    background: var(--bn-paper);
    border: 1px solid var(--bn-line);
    border-radius: 18px;
    outline: none;
    -webkit-appearance: none;
}
.bn-search input:focus { background: #fff; border-color: var(--bn-teal); box-shadow: 0 0 0 3px rgba(11, 143, 121, .15); }

.bn-user { display: flex; align-items: center; gap: 14px; flex: none; }
.bn-user__link { color: var(--bn-ink) !important; font-weight: 500; }
.bn-user__menu { position: relative; }
.bn-user__avatar { display: flex; align-items: center; gap: 6px; height: var(--bn-header-h); color: var(--bn-ink-3) !important; text-decoration: none !important; }
.bn-user__avatar img { width: 34px; height: 34px; border-radius: 50%; object-fit: cover; border: 1px solid var(--bn-line); }
.bn-remind {
    position: absolute;
    right: 0; top: calc(100% + 4px);
    display: flex; flex-direction: column;
    padding: 8px 12px;
    font-size: 13px;
    white-space: nowrap;
    background: var(--bn-warn-soft);
    border: 1px solid #f1d39d;
    border-radius: var(--bn-radius-s);
}
.bn-user__menu:hover .bn-remind { display: none; }

.bn-nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 40px; height: 40px;
    margin-left: auto;
    padding: 0 9px;
    background: transparent;
    border: 1px solid var(--bn-line);
    border-radius: var(--bn-radius-s);
    cursor: pointer;
}
.bn-nav-toggle span { display: block; height: 2px; background: var(--bn-ink); border-radius: 1px; transition: transform .2s, opacity .2s; }
.bn-nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.bn-nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.bn-nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- 页脚 ---------- */
.bn-footer {
    flex: none;
    margin-top: 72px;
    padding: 44px 0 0;
    color: #c4d1de;
    font-size: 14px;
    background: var(--bn-ink);
}
.bn-footer a { color: #e3ecf4 !important; }
.bn-footer__grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 32px; padding-bottom: 32px; }
.bn-footer__name { color: #fff; font-size: 16px; font-weight: 700; margin-bottom: 8px !important; }
.bn-footer__brand p:last-child { max-width: 36em; }
.bn-footer__title { color: #fff; font-weight: 600; margin-bottom: 8px !important; }
.bn-footer li { padding: 2px 0; }
.bn-footer__legal {
    display: flex;
    flex-wrap: wrap;
    gap: 6px 22px;
    padding-top: 16px;
    padding-bottom: 20px;
    font-size: 13px;
    color: #9fb2c5;
    border-top: 1px solid rgba(255, 255, 255, .12);
}
.bn-footer__legal a { color: #9fb2c5 !important; }

/* ---------- 通用页面标题 ---------- */
.bn-pagehead {
    padding: 40px 0 28px;
    background: var(--bn-surface);
    border-bottom: 1px solid var(--bn-line);
}
.bn-pagehead__inner { display: flex; align-items: flex-end; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.bn-pagehead h1 { font-size: 30px; }
.bn-pagehead__lead { margin-top: 8px !important; max-width: 42em; font-size: 16px; color: var(--bn-ink-3); }
.bn-crumb { margin-bottom: 10px !important; font-size: 14px; color: var(--bn-ink-3); }
.bn-crumb a { color: var(--bn-ink-3); }
.bn-crumb .fa { margin: 0 6px; font-size: 12px; }

.bn-section { padding: 56px 0 0; }
.bn-section__head { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 4px 16px; margin-bottom: 20px; }
.bn-section__head h2 { flex: none; }
.bn-section__head h2 { font-size: 24px; }
.bn-section__head p { color: var(--bn-ink-3); }

.bn-panel {
    background: var(--bn-surface);
    border: 1px solid var(--bn-line);
    border-radius: var(--bn-radius-m);
}

/* =============================================================================
   首页
   ========================================================================== */
.bn-hero {
    position: relative;
    padding: 64px 0 56px;
    background:
        linear-gradient(var(--bn-paper), var(--bn-paper)) padding-box;
    overflow: hidden;
}
.bn-hero__grid { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: 48px; align-items: center; }
.bn-hero__title { font-size: 46px; line-height: 1.2; letter-spacing: .02em; }
.bn-hero__lead { margin-top: 18px !important; max-width: 25em; font-size: 17px; color: var(--bn-ink-2); }
.bn-hero__actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.bn-hero__facts { display: grid; gap: 8px; margin-top: 36px !important; padding-top: 20px !important; border-top: 1px solid var(--bn-line); font-size: 14px; color: var(--bn-ink-3); }
.bn-hero__facts li { display: grid; grid-template-columns: 7.5em minmax(0, 1fr); gap: 12px; }
.bn-hero__facts strong { color: var(--bn-ink); font-size: 14px; }

/* 示意谱图（首页招牌元素） */
.bn-spectrum {
    margin: 0;
    padding: 20px 22px 14px;
    background: var(--bn-surface);
    border: 1px solid var(--bn-line);
    border-radius: 14px;
    box-shadow: var(--bn-shadow);
}
.bn-spectrum__top { display: grid; grid-template-columns: 210px 1fr; gap: 18px; align-items: center; }
.bn-spectrum__mol svg { display: block; width: 100%; height: auto; }
.bn-spectrum__mol .bond { stroke: var(--bn-ink); stroke-width: 2.2; stroke-linecap: round; fill: none; }
.bn-spectrum__mol .atom-o { fill: #c0392b; font-size: 17px; font-weight: 700; font-family: Arial, sans-serif; }
.bn-spectrum__mol .hl { fill: var(--bn-teal); opacity: 0; transition: opacity .2s; }
.bn-spectrum__mol .hl.is-on { opacity: .22; }
.bn-spectrum__readout { min-height: 118px; }
.bn-spectrum__readout h3 { font-size: 15px; font-weight: 600; color: var(--bn-ink-3); }
.bn-spectrum__shift { margin-top: 2px !important; color: var(--bn-ink); font-size: 30px; font-weight: 700; font-variant-numeric: tabular-nums; }
.bn-spectrum__mult { color: var(--bn-teal-hover); font-size: 14px; font-weight: 600; font-variant-numeric: tabular-nums; }
.bn-spectrum__assign { color: var(--bn-ink-2); font-size: 15px; }
.bn-spectrum__plot { position: relative; margin-top: 8px; }
.bn-spectrum__plot svg { display: block; width: 100%; height: auto; overflow: visible; }
.bn-spectrum__trace { fill: none; stroke: var(--bn-ink); stroke-width: 1.5; stroke-linejoin: round; pointer-events: none; }
.bn-spectrum__axis, .bn-spectrum__plot svg > text { pointer-events: none; }
.bn-spectrum__axis line, .bn-spectrum__axis path { stroke: var(--bn-line-strong); stroke-width: 1; }
.bn-spectrum__axis text { fill: var(--bn-ink-3); font-size: 11px; font-family: Arial, sans-serif; }
.bn-spectrum__peak { cursor: pointer; outline: none; }
.bn-spectrum__peak rect { fill: transparent; }
.bn-spectrum__peak .band { fill: var(--bn-teal); opacity: 0; transition: opacity .15s; }
.bn-spectrum__peak:hover .band, .bn-spectrum__peak.is-on .band { opacity: .12; }
.bn-spectrum__peak .tag { fill: var(--bn-ink-3); font-size: 11px; font-family: Arial, sans-serif; text-anchor: middle; }
.bn-spectrum__peak.is-on .tag { fill: var(--bn-teal); font-weight: 700; }
.bn-spectrum__peak:focus-visible .band { opacity: .2; }
.bn-spectrum__caption { display: flex; justify-content: space-between; gap: 12px; margin-top: 6px !important; font-size: 13px; color: var(--bn-ink-3); }

/* 工具列表：以 ppm 刻度式横线分隔，不同于常见卡片网格 */
.bn-tools { border-top: 2px solid var(--bn-ink); }
.bn-tool {
    display: grid;
    grid-template-columns: 220px minmax(0, 1fr) 200px;
    gap: 36px;
    align-items: center;
    padding: 28px 0;
    border-bottom: 1px solid var(--bn-line);
}
.bn-tool__art { display: flex; align-items: center; justify-content: center; height: 132px; background: var(--bn-surface); border: 1px solid var(--bn-line); border-radius: var(--bn-radius-m); }
.bn-tool__art img { max-height: 104px; width: auto; }
.bn-tool__art--photo { overflow: hidden; }
.bn-tool__art--photo img { width: 100%; height: 100%; max-height: none; object-fit: cover; object-position: right center; }
.bn-tool h3 { font-size: 21px; }
.bn-tool__meta { margin-top: 2px !important; font-size: 14px; color: var(--bn-teal-hover); font-weight: 600; }
.bn-tool__text { margin-top: 10px !important; max-width: 38em; }
.bn-tool__cta { display: flex; flex-direction: column; gap: 8px; align-items: stretch; }
.bn-tool__price { font-size: 13px; color: var(--bn-ink-3); text-align: center; }

.bn-home-bottom { display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: 32px; }
.bn-news { padding: 6px 22px; }
.bn-news li { border-bottom: 1px solid var(--bn-line); }
.bn-news li:last-child { border-bottom: 0; }
.bn-news a {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 16px;
    padding: 13px 0;
    color: var(--bn-ink) !important;
}
.bn-news a span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.bn-news time { color: var(--bn-ink-3); font-size: 13px; font-variant-numeric: tabular-nums; }
.bn-news__empty { padding: 28px 0; color: var(--bn-ink-3); }

.bn-about { padding: 24px; }
.bn-about h3 { font-size: 18px; margin-bottom: 8px !important; }
.bn-about__quote { margin: 14px 0 18px !important; padding-left: 14px; border-left: 3px solid var(--bn-teal); color: var(--bn-ink); }
.bn-about dl { display: grid; grid-template-columns: 4.5em 1fr; gap: 6px 12px; margin: 0; font-size: 14px; }
.bn-about dt { color: var(--bn-ink-3); font-weight: 400; }
.bn-about dd { margin: 0; color: var(--bn-ink); }

/* =============================================================================
   工作台（核磁预测 / 沸点预测 / IUPAC 中文名）
   ========================================================================== */
.bn-bench { display: grid; grid-template-columns: minmax(0, 1fr) 340px; gap: 24px; align-items: start; margin-top: 28px; }
.bn-editor { padding: 12px; overflow-x: auto; }
.bn-editor__frame {
    display: block;
    width: 100%;
    min-width: 640px;
    height: 480px;
    border: 0;
    border-radius: var(--bn-radius-s);
    background: #fff;
}
.bn-editor__bar { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; padding: 10px 4px 2px; font-size: 13px; color: var(--bn-ink-3); }
.bn-editor__bar strong { color: var(--bn-ink-2); font-weight: 600; margin-right: 4px; }
.bn-editor__bar #bn-examples { display: contents; }
.bn-editor__status { margin-left: auto; }
.bn-chip {
    padding: 3px 10px;
    font: inherit;
    font-size: 13px;
    color: var(--bn-ink);
    background: var(--bn-paper);
    border: 1px solid var(--bn-line);
    border-radius: 14px;
    cursor: pointer;
}
.bn-chip:hover { border-color: var(--bn-teal); background: var(--bn-teal-soft); }
.bn-chip:disabled { cursor: not-allowed; opacity: .55; }

.bn-control { padding: 6px 20px 20px; }
.bn-steps { counter-reset: bnstep; }
.bn-step { position: relative; padding: 16px 0 16px 38px; border-bottom: 1px solid var(--bn-line); }
.bn-step:last-child { border-bottom: 0; }
.bn-step::before {
    counter-increment: bnstep;
    content: counter(bnstep);
    position: absolute;
    left: 0; top: 16px;
    display: grid; place-items: center;
    width: 26px; height: 26px;
    font-size: 13px; font-weight: 700;
    color: var(--bn-teal-hover);
    background: var(--bn-teal-soft);
    border-radius: 50%;
}
.bn-step h2 { font-size: 16px; }
.bn-step p { margin-top: 4px !important; font-size: 14px; color: var(--bn-ink-3); }
.bn-step__actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.bn-step__actions .bn-btn { flex: 1 1 auto; }

.bn-segment { display: flex; margin: 12px 0 0 !important; padding: 3px !important; background: var(--bn-paper); border: 1px solid var(--bn-line); border-radius: var(--bn-radius-s); }
.bn-segment label { flex: 1; margin: 0; }
.bn-segment input { position: absolute; opacity: 0; pointer-events: none; }
.bn-segment span {
    display: block;
    padding: 7px 4px;
    text-align: center;
    font-size: 14px;
    font-weight: 600;
    color: var(--bn-ink-2);
    border-radius: 4px;
    cursor: pointer;
}
.bn-segment input:checked + span { color: #fff; background: var(--bn-ink); }
.bn-segment input:focus-visible + span { outline: 3px solid rgba(11, 143, 121, .45); }

.bn-price {
    margin-top: 16px;
    padding: 12px 14px;
    font-size: 13px;
    line-height: 1.6;
    color: var(--bn-warn);
    background: var(--bn-warn-soft);
    border-radius: var(--bn-radius-s);
}
.bn-price strong { color: #6e4100; }
.bn-note { margin-top: 12px !important; font-size: 13px; color: var(--bn-ink-3); }

.bn-result { margin-top: 24px; padding: 20px; }
.bn-result[hidden] { display: none; }
.bn-result__head { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-bottom: 12px; }
.bn-result__head h2 { font-size: 17px; }
.bn-result canvas { max-width: 100%; border-radius: var(--bn-radius-s); }

.bn-howto { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 28px; margin-top: 36px; }
.bn-howto h3 { font-size: 16px; margin-bottom: 6px !important; }
.bn-howto p { font-size: 14px; }

/* 筹建中页面 */
.bn-soon { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 40px; align-items: center; margin-top: 32px; padding: 40px; }
.bn-soon h2 { font-size: 22px; margin-bottom: 10px !important; }
.bn-soon ul { margin-top: 14px !important; }
.bn-soon li { padding: 4px 0 4px 18px; position: relative; }
.bn-soon li::before { content: ""; position: absolute; left: 0; top: 13px; width: 7px; height: 7px; border-radius: 50%; background: var(--bn-teal); }
.bn-soon__art { text-align: center; }
.bn-soon__art img { max-height: 210px; }
.bn-soon__links { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 24px; }

/* 栏目首页（/chemCal、/chemSearch） */
.bn-hub { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; margin-top: 28px; }
.bn-hub--two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.bn-hub__item { display: flex; flex-direction: column; padding: 22px; color: inherit !important; text-decoration: none !important; transition: border-color .15s; }
.bn-hub__item:hover { border-color: var(--bn-teal); }
.bn-hub__item img { width: 100%; height: 150px; padding: 12px; object-fit: contain; margin-bottom: 18px; background: var(--bn-paper); border-radius: var(--bn-radius-s); }
.bn-hub__item img.is-photo { padding: 0; object-fit: cover; object-position: right center; }
.bn-hub__item h2 { font-size: 18px; }
.bn-hub__item p { margin-top: 6px !important; font-size: 14px; flex: 1; }
.bn-hub__go { margin-top: 14px !important; font-weight: 600; color: var(--bn-teal-hover); }
.bn-hub__item.is-soon { background: transparent; border-style: dashed; }
.bn-hub__item.is-soon .bn-hub__go { color: var(--bn-ink-3); }

/* =============================================================================
   弹层（layui layer）内容
   ========================================================================== */
.bn-dialog { padding: 24px 28px; color: var(--bn-ink-2); font-size: 14px; line-height: 1.75; background: #fff; }
.bn-dialog__grid { display: grid; grid-template-columns: minmax(0, 1fr) 220px; gap: 24px; align-items: start; }
.bn-dialog__grid--wide { grid-template-columns: 300px minmax(0, 1fr); }
.bn-dialog h3 { font-size: 16px; margin-bottom: 10px !important; color: var(--bn-ink); }
.bn-dialog dl { display: grid; grid-template-columns: 5em minmax(0, 1fr); gap: 4px 10px; margin: 0; }
.bn-dialog dt { color: var(--bn-ink-3); font-weight: 400; }
.bn-dialog dd { margin: 0; color: var(--bn-ink); word-break: break-word; }
.bn-dialog .bn-dialog__price { color: var(--bn-teal-hover); font-size: 18px; font-weight: 700; }
.bn-dialog .bn-dialog__name { color: var(--bn-teal-hover); font-weight: 700; }
.bn-dialog__hint { margin-top: 14px !important; padding: 8px 12px; font-size: 13px; color: var(--bn-warn); background: var(--bn-warn-soft); border-radius: var(--bn-radius-s); }
.bn-dialog__struct { padding: 8px; text-align: center; background: var(--bn-paper); border: 1px solid var(--bn-line); border-radius: var(--bn-radius-s); }
.bn-dialog__struct svg { width: 100%; height: auto; max-height: 260px; }
.bn-dialog__pay { text-align: center; }
.bn-dialog__pay img.bn-qr { width: 200px; height: 200px; margin: 8px auto; border: 1px solid var(--bn-line); border-radius: var(--bn-radius-s); }
.bn-dialog__scanned { display: none; margin-top: 8px; color: var(--bn-teal-hover); font-weight: 600; }
.bn-dialog__tools { display: flex; gap: 8px; margin-bottom: 12px; }
.bn-bp-readout { margin: 6px 0 18px !important; font-size: 15px; }
.bn-bp-readout strong { font-size: 26px; color: var(--bn-ink); font-variant-numeric: tabular-nums; }
.bn-dialog .layui-slider { margin: 18px 90px 12px 0; }
.bn-layer .layui-layer-title { font-weight: 600; color: var(--bn-ink); background: #fff; border-bottom: 1px solid var(--bn-line); }
.bn-layer .layui-layer-btn a { border-radius: var(--bn-radius-s); }
.bn-layer .layui-layer-btn .layui-layer-btn0 { background: var(--bn-teal); border-color: var(--bn-teal); }
.bn-layer .layui-table-tool, .bn-layer .layui-table-header, .bn-layer .layui-table thead tr,
.bn-layer .layui-table-mend, .bn-layer .layui-table-patch { background-color: #fff !important; }
.bn-layer .layui-table th { color: var(--bn-ink) !important; background: var(--bn-paper); font-weight: 600; }
.bn-layer .layui-table tbody tr:hover, .bn-layer .layui-table-hover { background-color: var(--bn-paper) !important; }
.bn-layer .layui-table-click { background-color: var(--bn-teal-soft) !important; }
.bn-layer .layui-form-radioed > i, .bn-layer .layui-form-radio > i:hover { color: var(--bn-teal) !important; }
.bn-layer .layui-laypage .layui-laypage-curr .layui-laypage-em { background-color: var(--bn-ink) !important; }
.bn-layer .layui-slider-input-txt input { color: var(--bn-ink); font-weight: 700; }
.bn-layer .layui-slider-input { width: 80px; }

/* =============================================================================
   产品
   ========================================================================== */
.bn-filter { position: relative; flex: 0 1 320px; }
.bn-filter .fa { position: absolute; left: 13px; top: 50%; transform: translateY(-50%); color: var(--bn-ink-3); }
.bn-input {
    width: 100%;
    height: 42px;
    padding: 0 14px;
    font: inherit;
    font-size: 15px;
    color: var(--bn-ink);
    background: #fff;
    border: 1px solid var(--bn-line-strong);
    border-radius: var(--bn-radius-s);
    outline: none;
    -webkit-appearance: none;
}
.bn-filter .bn-input { padding-left: 38px; }
.bn-input:focus { border-color: var(--bn-teal); box-shadow: 0 0 0 3px rgba(11, 143, 121, .15); }
textarea.bn-input { height: auto; min-height: 120px; padding: 10px 14px; line-height: 1.6; resize: vertical; }

.bn-catalog { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 20px; margin-top: 28px; }
.bn-product { display: flex; flex-direction: column; overflow: hidden; }
.bn-product__struct {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 190px;
    padding: 12px;
    background: #fff;
    border-bottom: 1px solid var(--bn-line);
}
.bn-product__struct svg { width: auto !important; height: 100% !important; max-width: 100%; }
.bn-product__body { display: flex; flex-direction: column; flex: 1; padding: 16px 18px 18px; }
.bn-product h2 { font-size: 17px; }
.bn-cas {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    align-self: flex-start;
    margin-top: 6px;
    padding: 1px 8px;
    font-size: 13px;
    color: var(--bn-ink-2);
    background: var(--bn-paper);
    border: 1px solid var(--bn-line);
    border-radius: 4px;
    cursor: pointer;
    font-family: inherit;
    font-variant-numeric: tabular-nums;
}
.bn-cas:hover { border-color: var(--bn-teal); }
.bn-cas .fa { font-size: 12px; color: var(--bn-ink-3); }
.bn-specs { display: grid; grid-template-columns: 4em minmax(0, 1fr); gap: 3px 10px; margin: 12px 0 0; font-size: 14px; }
.bn-specs dt { color: var(--bn-ink-3); font-weight: 400; }
.bn-specs dd { margin: 0; color: var(--bn-ink); }
.bn-product__desc { margin-top: 10px !important; font-size: 13px; color: var(--bn-ink-3); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.bn-product__foot { display: flex; gap: 8px; margin-top: auto; padding-top: 14px; }
.bn-product__foot .bn-btn { flex: 1; }
.bn-catalog__empty { grid-column: 1 / -1; padding: 48px 20px; text-align: center; color: var(--bn-ink-3); }

.bn-pagination { display: flex; justify-content: center; margin-top: 36px; }
.bn-pagination ul { display: flex; flex-wrap: wrap; gap: 6px; }
.bn-pagination a, .bn-pagination span {
    display: grid;
    place-items: center;
    min-width: 38px;
    height: 38px;
    padding: 0 10px;
    color: var(--bn-ink) !important;
    background: #fff;
    border: 1px solid var(--bn-line);
    border-radius: var(--bn-radius-s);
    text-decoration: none !important;
    font-variant-numeric: tabular-nums;
}
.bn-pagination a:hover { border-color: var(--bn-teal); }
.bn-pagination .is-current { color: #fff !important; background: var(--bn-ink); border-color: var(--bn-ink); }
.bn-pagination .is-gap { border: 0; background: transparent; min-width: 20px; padding: 0; }

.bn-toast {
    position: fixed;
    left: 50%; bottom: 32px;
    z-index: 2000;
    padding: 10px 18px;
    color: #fff;
    font-size: 14px;
    background: var(--bn-ink);
    border-radius: var(--bn-radius-s);
    transform: translate(-50%, 20px);
    opacity: 0;
    pointer-events: none;
    transition: opacity .2s, transform .2s;
}
.bn-toast.is-on { opacity: 1; transform: translate(-50%, 0); }

/* =============================================================================
   联系我们
   ========================================================================== */
.bn-contact { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: 28px; margin-top: 28px; align-items: start; }
.bn-contact__card { padding: 8px 24px; }
.bn-contact__row { display: grid; grid-template-columns: 36px minmax(0, 1fr) auto; gap: 14px; align-items: center; padding: 16px 0; border-bottom: 1px solid var(--bn-line); }
.bn-contact__row:last-child { border-bottom: 0; }
.bn-contact__icon { display: grid; place-items: center; width: 36px; height: 36px; color: var(--bn-teal-hover); background: var(--bn-teal-soft); border-radius: 50%; }
.bn-contact__label { font-size: 13px; color: var(--bn-ink-3); }
.bn-contact__value { color: var(--bn-ink); font-size: 16px; font-weight: 600; word-break: break-all; }
.bn-contact__value a { color: var(--bn-ink) !important; }
.bn-iconbtn {
    display: grid; place-items: center;
    width: 34px; height: 34px;
    color: var(--bn-ink-3);
    background: transparent;
    border: 1px solid var(--bn-line);
    border-radius: var(--bn-radius-s);
    cursor: pointer;
}
.bn-iconbtn:hover { color: var(--bn-teal-hover); border-color: var(--bn-teal); }
.bn-hours { margin-top: 16px; padding: 16px 24px; font-size: 14px; }

.bn-form { padding: 24px 28px 28px; }
.bn-form h2 { font-size: 20px; }
.bn-form__lead { margin-top: 4px !important; font-size: 14px; color: var(--bn-ink-3); }
.bn-form__grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px 18px; margin-top: 20px; }
.bn-field { display: flex; flex-direction: column; gap: 6px; }
.bn-field--full { grid-column: 1 / -1; }
.bn-field label { font-size: 14px; font-weight: 600; color: var(--bn-ink); }
.bn-field label em { font-style: normal; color: var(--bn-danger); margin-left: 2px; }
.bn-field__error { display: none; font-size: 13px; color: var(--bn-danger); }
.bn-field.is-invalid .bn-input { border-color: var(--bn-danger); }
.bn-field.is-invalid .bn-field__error { display: block; }
.bn-form__foot { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px; margin-top: 22px; }
.bn-form__foot p { font-size: 13px; color: var(--bn-ink-3); max-width: 28em; }

/* =============================================================================
   响应式
   ========================================================================== */
@media (max-width: 1080px) {
    .bn-search { display: none; }
    .bn-tool { grid-template-columns: 160px minmax(0, 1fr); }
    .bn-tool__cta { grid-column: 2; flex-direction: row; align-items: center; }
    .bn-tool__price { text-align: left; }
    .bn-bench { grid-template-columns: minmax(0, 1fr); }
    .bn-steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); column-gap: 28px; }
    .bn-step { border-bottom: 0; }
}

@media (max-width: 900px) {
    :root { --bn-header-h: 58px; }
    .bn-header__inner { gap: 12px; }
    .bn-nav-toggle { display: flex; }
    .bn-nav {
        position: absolute;
        left: 0; right: 0; top: var(--bn-header-h);
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        max-height: calc(100vh - var(--bn-header-h));
        overflow-y: auto;
        padding: 8px 20px 20px;
        background: #fff;
        border-bottom: 1px solid var(--bn-line);
        box-shadow: var(--bn-shadow);
        display: none;
    }
    .bn-nav.is-open { display: flex; }
    .bn-nav__list { flex-direction: column; align-items: stretch; }
    .bn-nav__link { height: auto; padding: 12px 0; border: 0; justify-content: space-between; width: 100%; }
    .bn-nav__link.is-active { color: var(--bn-teal) !important; }
    .bn-menu { position: static; display: none; opacity: 1; visibility: visible; transform: none; box-shadow: none; border: 0; padding: 0 0 8px 12px !important; min-width: 0; }
    .bn-nav__item--menu.is-open > .bn-menu { display: block; }
    .bn-nav__item--menu:hover > .bn-menu { display: none; }
    .bn-nav__item--menu.is-open:hover > .bn-menu { display: block; }
    .bn-search { display: block; flex: none; margin-top: 12px; }
    .bn-user { margin-top: 16px; }
    .bn-user__menu > .bn-menu { display: block; position: static; padding: 0 !important; }
    .bn-user__avatar { height: auto; }
    .bn-hero__grid { grid-template-columns: minmax(0, 1fr); gap: 32px; }
    .bn-hero__title { font-size: 36px; }
    .bn-home-bottom, .bn-contact, .bn-soon { grid-template-columns: minmax(0, 1fr); }
    .bn-hub { grid-template-columns: minmax(0, 1fr); }
    .bn-howto { grid-template-columns: minmax(0, 1fr); gap: 16px; }
    .bn-footer__grid { grid-template-columns: 1fr 1fr; }
    .bn-footer__brand { grid-column: 1 / -1; }
    .bn-dialog__grid, .bn-dialog__grid--wide { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 600px) {
    body.bn-body { font-size: 14px; }
    .bn-wrap { padding: 0 16px; }
    .bn-hero { padding: 36px 0 32px; }
    .bn-hero__title { font-size: 30px; }
    .bn-pagehead { padding: 28px 0 20px; }
    .bn-pagehead h1 { font-size: 24px; }
    .bn-spectrum { padding: 14px; }
    .bn-spectrum__top { grid-template-columns: 1fr; }
    .bn-spectrum__mol { max-width: 220px; }
    .bn-tool { grid-template-columns: minmax(0, 1fr); gap: 14px; }
    .bn-tool__art { height: 110px; }
    .bn-tool__cta { grid-column: auto; }
    .bn-form { padding: 20px; }
    .bn-form__grid { grid-template-columns: minmax(0, 1fr); }
    .bn-soon { padding: 24px; }
    .bn-news a { grid-template-columns: minmax(0, 1fr); gap: 2px; }
    .bn-footer__grid { grid-template-columns: minmax(0, 1fr); gap: 20px; }
}

@media (prefers-reduced-motion: reduce) {
    .bn-body *, .bn-body *::before, .bn-body *::after {
        transition-duration: .01ms !important;
        animation-duration: .01ms !important;
        animation-iteration-count: 1 !important;
    }
}

@media print {
    .bn-header, .bn-footer, .bn-skip { display: none !important; }
    body.bn-body { background: #fff; }
}