/* ==========================================================================
   Best Capstone — 前台统一样式  /  2026-09 全新视觉规范
   设计原则:
     - 主色 #0A2540 深蓝(专业可靠), 辅 #00B5D8 青色(科技前沿), 强调 #FF6B35 橙(CTA)
     - 字体: Inter / 思源黑体 / system, 字重 400/500/600/700/800
     - 圆角 6/8/14/20px, 阴影等级 1/2/3
     - 间距 8 进制
   ========================================================================== */

/* ---------- CSS Reset (轻量) ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
    font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont,
                 'Segoe UI', Arial, sans-serif;
    color: var(--bc-text);
    background: var(--bc-bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}
img, svg { max-width: 100%; display: block; }
a { color: var(--bc-primary); text-decoration: none; transition: color .2s; }
a:hover { color: var(--bc-accent); }
button, input, select, textarea { font: inherit; color: inherit; }
ul, ol { list-style: none; }

/* ---------- 设计 Token ---------- */
:root {
    /* Brand */
    --bc-primary:      #0A2540;            /* 深蓝(品牌主色) */
    --bc-primary-700:  #0F2A5F;
    --bc-primary-50:   #E6EDF7;
    --bc-accent:       #00B5D8;            /* 青色(科技感) */
    --bc-accent-600:   #0E94B0;
    --bc-accent-50:    #E0F7FB;
    --bc-cta:          #FF6B35;            /* 橙(强行动) */
    --bc-cta-600:      #E55725;

    /* Neutrals */
    --bc-bg:           #F7FAFC;            /* 页面背景 */
    --bc-surface:      #FFFFFF;            /* 卡片表面 */
    --bc-text:         #1A202C;            /* 主文字 */
    --bc-text-soft:    #4A5568;            /* 副文字 */
    --bc-text-muted:   #718096;            /* 弱文字 */
    --bc-border:       #E2E8F0;
    --bc-border-soft:  #EDF2F7;

    /* Status */
    --bc-success:      #22C55E;
    --bc-warning:      #F59E0B;
    --bc-danger:       #DC2626;
    --bc-info:         #3B82F6;

    /* Spacing / Radius / Shadow */
    --bc-r-sm: 6px;
    --bc-r-md: 8px;
    --bc-r-lg: 14px;
    --bc-r-xl: 20px;
    --bc-r-pill: 9999px;

    --bc-s-1: 0 1px 2px rgba(10, 37, 64, .06);
    --bc-s-2: 0 2px 8px rgba(10, 37, 64, .08), 0 1px 2px rgba(10, 37, 64, .04);
    --bc-s-3: 0 12px 28px rgba(10, 37, 64, .10), 0 2px 4px rgba(10, 37, 64, .05);
    --bc-s-4: 0 24px 48px rgba(10, 37, 64, .14);

    /* Layout */
    --bc-container: 1200px;
    --bc-header-h:  72px;
}

/* ---------- Layout ---------- */
.bc-container {
    max-width: var(--bc-container);
    margin: 0 auto;
    padding: 0 24px;
}

.bc-section {
    padding: 72px 0;
}
.bc-section--tight { padding: 48px 0; }
.bc-section--alt   { background: #FFFFFF; }
.bc-section--ink   { background: var(--bc-primary); color: #E2E8F0; }

/* ---------- 顶部 Header ---------- */
.bc-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.96);
    backdrop-filter: saturate(180%) blur(12px);
    border-bottom: 1px solid var(--bc-border);
}
.bc-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--bc-header-h);
    gap: 32px;
}
.bc-logo { display: flex; align-items: center; gap: 10px; }
.bc-logo__img { height: 44px; width: auto; }
.bc-logo__img--compact { height: 36px; }
.bc-logo__text {
    font-weight: 800;
    font-size: 18px;
    color: var(--bc-primary);
    letter-spacing: -.3px;
}
.bc-logo__text small {
    display: block;
    font-size: 10px;
    font-weight: 600;
    color: var(--bc-text-muted);
    letter-spacing: 2px;
    margin-top: 2px;
}

.bc-nav {
    display: flex;
    align-items: center;
    gap: 8px;
    flex: 1;
    justify-content: center;
}
.bc-nav__link {
    color: var(--bc-text);
    font-weight: 500;
    padding: 8px 14px;
    border-radius: var(--bc-r-md);
    transition: background .2s, color .2s;
}
.bc-nav__link:hover { background: var(--bc-primary-50); color: var(--bc-primary); }
.bc-nav__link.is-active { color: var(--bc-primary); font-weight: 600; }
.bc-nav__link.is-active::after {
    content: '';
    display: block;
    height: 2px;
    background: var(--bc-accent);
    border-radius: 2px;
    margin-top: 6px;
}

.bc-header__actions { display: flex; align-items: center; gap: 12px; position: relative; }

/* ---------- 后台登录账号徽标(右上角,悬浮显示退出;2026-11-01) ---------- */
.bc-admin-badge {
    position: absolute;
    right: 0;
    top: calc(100% + 4px);
    z-index: 90;
    font-size: 13.5px;
    font-weight: 800;
    color: #E11D2E;
    letter-spacing: .3px;
    white-space: nowrap;
    text-shadow: 0 1px 0 rgba(255,255,255,.6);
    cursor: pointer;
}
.bc-admin-badge__out {
    display: none;
    background: #E11D2E;
    color: #fff;
    font-size: 12.5px;
    padding: 3px 12px;
    border-radius: 999px;
    box-shadow: 0 3px 10px rgba(225, 29, 46, .35);
}
.bc-admin-badge:hover .bc-admin-badge__name { display: none; }
.bc-admin-badge:hover .bc-admin-badge__out { display: inline-block; }
@media (max-width: 760px) { .bc-admin-badge { font-size: 12px; top: calc(100% + 2px); } }

/* ---------- 语言切换器 ---------- */
.bc-lang { position: relative; }
.bc-lang__btn {
    display: flex; align-items: center; gap: 6px;
    background: var(--bc-bg);
    border: 1px solid var(--bc-border);
    color: var(--bc-text);
    padding: 7px 12px;
    border-radius: var(--bc-r-md);
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    transition: background .2s, border-color .2s;
}
.bc-lang__btn:hover { background: var(--bc-primary-50); border-color: var(--bc-primary); }
.bc-lang__btn::before {
    content: '';
    width: 14px; height: 14px;
    background: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%234A5568' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'><circle cx='12' cy='12' r='10'/><path d='M2 12h20M12 2a15 15 0 0 1 0 20M12 2a15 15 0 0 0 0 20'/></svg>") no-repeat center / contain;
}
.bc-lang__menu {
    position: absolute;
    right: 0;
    top: calc(100% + 8px);
    background: #fff;
    border: 1px solid var(--bc-border);
    border-radius: var(--bc-r-md);
    box-shadow: var(--bc-s-3);
    min-width: 160px;
    overflow: hidden;
    display: none;
    z-index: 200;
}
.bc-lang.is-open .bc-lang__menu { display: block; }
.bc-lang__menu a {
    display: flex; justify-content: space-between; align-items: center;
    padding: 9px 14px;
    font-size: 14px;
    color: var(--bc-text);
    border-bottom: 1px solid var(--bc-border-soft);
}
.bc-lang__menu a:last-child { border-bottom: none; }
.bc-lang__menu a:hover { background: var(--bc-primary-50); color: var(--bc-primary); }
.bc-lang__menu a.is-active { font-weight: 600; color: var(--bc-primary); }
.bc-lang__menu small { color: var(--bc-text-muted); font-size: 11px; }

/* ---------- 移动端汉堡按钮 ---------- */
.bc-nav-toggle {
    display: none;
    background: transparent; border: none;
    width: 40px; height: 40px;
    cursor: pointer;
    color: var(--bc-primary);
    align-items: center; justify-content: center;
}
.bc-nav-toggle svg { width: 22px; height: 22px; }

/* ---------- Buttons ---------- */
.bc-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: var(--bc-r-md);
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    transition: all .2s;
    border: 1.5px solid transparent;
    white-space: nowrap;
}
.bc-btn:hover { transform: translateY(-1px); }
.bc-btn--primary { background: var(--bc-primary); color: #fff; }
.bc-btn--primary:hover { background: var(--bc-primary-700); color: #fff; }
.bc-btn--accent { background: var(--bc-accent); color: #fff; }
.bc-btn--accent:hover { background: var(--bc-accent-600); color: #fff; }
.bc-btn--cta { background: var(--bc-cta); color: #fff; }
.bc-btn--cta:hover { background: var(--bc-cta-600); color: #fff; }
.bc-btn--ghost {
    background: transparent;
    color: var(--bc-primary);
    border-color: var(--bc-border);
}
.bc-btn--ghost:hover { border-color: var(--bc-primary); color: var(--bc-primary); background: var(--bc-primary-50); }
.bc-btn--sm { padding: 6px 14px; font-size: 13px; }
.bc-btn--lg { padding: 14px 28px; font-size: 16px; }
.bc-btn[disabled], .bc-btn.is-disabled { opacity: .5; cursor: not-allowed; }
.bc-btn[disabled]:hover { transform: none; }

/* ---------- 标题排版 ---------- */
.bc-h1 { font-size: clamp(2rem, 4.2vw, 3.4rem); font-weight: 800; color: var(--bc-primary); line-height: 1.15; letter-spacing: -.5px; }
.bc-h2 { font-size: clamp(1.6rem, 3vw, 2.25rem); font-weight: 700; color: var(--bc-primary); line-height: 1.25; letter-spacing: -.3px; }
.bc-h3 { font-size: 1.25rem; font-weight: 700; color: var(--bc-text); }
.bc-eyebrow {
    display: inline-block;
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--bc-accent);
    background: var(--bc-accent-50);
    padding: 6px 14px;
    border-radius: var(--bc-r-pill);
    margin-bottom: 16px;
}
.bc-section__head { text-align: center; max-width: 720px; margin: 0 auto 48px; }
.bc-section__head p { color: var(--bc-text-soft); margin-top: 12px; font-size: 1.05rem; }

/* ---------- Hero ---------- */
.bc-hero {
    position: relative;
    overflow: hidden;
    background:
        radial-gradient(1000px 500px at 80% -10%, rgba(0, 181, 216, .25), transparent 60%),
        radial-gradient(800px 600px at 0% 100%, rgba(255, 107, 53, .15), transparent 60%),
        linear-gradient(135deg, #0A2540 0%, #0F2A5F 100%);
    color: #fff;
    padding: 96px 0 112px;
}
.bc-hero__grid-bg {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px);
    background-size: 40px 40px;
    mask-image: radial-gradient(circle at center, black 30%, transparent 75%);
    pointer-events: none;
}
.bc-hero__inner { position: relative; z-index: 1; max-width: var(--bc-container); margin: 0 auto; padding: 0 24px; }
.bc-hero__content { max-width: 720px; }
.bc-hero__eyebrow {
    display: inline-block;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--bc-accent);
    background: rgba(0, 181, 216, .15);
    border: 1px solid rgba(0, 181, 216, .35);
    padding: 6px 14px;
    border-radius: var(--bc-r-pill);
    margin-bottom: 24px;
}
.bc-hero h1 {
    font-size: clamp(2.25rem, 5vw, 3.75rem);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -.5px;
    margin-bottom: 20px;
}
.bc-hero h1 .bc-hl { color: var(--bc-accent); }
.bc-hero p {
    font-size: 1.15rem;
    color: rgba(255,255,255,.85);
    margin-bottom: 32px;
    max-width: 600px;
}
.bc-hero__cta { display: flex; gap: 14px; flex-wrap: wrap; }
.bc-hero__stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 20px;
    margin-top: 56px;
    max-width: 720px;
}
.bc-hero__stat {
    background: rgba(255,255,255,.06);
    border: 1px solid rgba(255,255,255,.12);
    border-radius: var(--bc-r-md);
    padding: 18px 20px;
    backdrop-filter: blur(8px);
}
.bc-hero__stat strong {
    display: block;
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--bc-accent);
    line-height: 1;
}
.bc-hero__stat span { font-size: 13px; color: rgba(255,255,255,.75); margin-top: 6px; display: block; }

.bc-hero__circuit {
    position: absolute;
    right: -50px;
    top: 50%;
    transform: translateY(-50%);
    opacity: .14;
    width: 540px;
    pointer-events: none;
}

/* ---------- Cards ---------- */
.bc-card {
    background: var(--bc-surface);
    border-radius: var(--bc-r-lg);
    box-shadow: var(--bc-s-2);
    border: 1px solid var(--bc-border-soft);
    overflow: hidden;
    transition: transform .3s, box-shadow .3s, border-color .3s;
}
.bc-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--bc-s-3);
    border-color: var(--bc-accent);
}
.bc-card__img {
    aspect-ratio: 16/10;
    width: 100%;
    object-fit: cover;
    background: var(--bc-border-soft);
}
.bc-card__body { padding: 22px; }
.bc-card__title {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--bc-primary);
    margin-bottom: 6px;
    line-height: 1.35;
}
.bc-card__sub {
    font-size: .85rem;
    color: var(--bc-text-muted);
    margin-bottom: 12px;
}
.bc-card__desc {
    font-size: .9rem;
    color: var(--bc-text-soft);
    line-height: 1.6;
    margin-bottom: 14px;
}
.bc-card__foot {
    display: flex; justify-content: space-between; align-items: center;
    margin-top: 14px;
}
.bc-card__more { font-size: 13px; font-weight: 600; color: var(--bc-accent); }
.bc-card__more::after { content: ' →'; transition: transform .2s; display: inline-block; }
.bc-card:hover .bc-card__more::after { transform: translateX(4px); }

/* ---------- Grids ---------- */
.bc-grid-products {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}
.bc-grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 24px;
}
.bc-grid-2 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 32px;
    align-items: start;
}

/* ---------- Filter Bar (产品页) ---------- */
.bc-filter {
    display: flex; justify-content: space-between; align-items: center;
    gap: 20px; flex-wrap: wrap;
    margin-bottom: 32px;
    padding: 18px 22px;
    background: var(--bc-surface);
    border-radius: var(--bc-r-lg);
    box-shadow: var(--bc-s-1);
    border: 1px solid var(--bc-border-soft);
}
.bc-tabs { display: flex; gap: 8px; flex-wrap: wrap; }
.bc-tab {
    padding: 8px 16px;
    background: var(--bc-bg);
    color: var(--bc-text);
    border-radius: var(--bc-r-pill);
    font-size: 14px;
    font-weight: 500;
    border: 1px solid transparent;
    transition: all .2s;
}
.bc-tab:hover { background: var(--bc-primary-50); color: var(--bc-primary); }
.bc-tab.is-active {
    background: var(--bc-primary);
    color: #fff;
    border-color: var(--bc-primary);
}
.bc-search {
    display: flex; gap: 8px; align-items: center;
    background: var(--bc-bg);
    border-radius: var(--bc-r-pill);
    padding: 4px 4px 4px 16px;
    border: 1px solid var(--bc-border);
    min-width: 280px;
}
.bc-search input { background: transparent; border: none; outline: none; flex: 1; padding: 8px 0; }
.bc-search button {
    background: var(--bc-primary); color: #fff;
    border: none; border-radius: var(--bc-r-pill);
    padding: 8px 18px; font-weight: 600;
    cursor: pointer;
    transition: background .2s;
}
.bc-search button:hover { background: var(--bc-primary-700); }

/* ---------- Footer ---------- */
.bc-footer {
    background: #06182F;
    color: #A0AEC0;
    padding: 64px 0 24px;
    margin-top: 64px;
}
.bc-footer__grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr 1fr;
    gap: 48px;
    max-width: var(--bc-container);
    margin: 0 auto;
    padding: 0 24px;
}
.bc-footer h4 {
    color: #fff; font-size: .95rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 18px;
}
.bc-footer__about p { font-size: 14px; line-height: 1.7; margin-bottom: 18px; }
.bc-footer ul li { margin-bottom: 9px; }
.bc-footer ul a { color: #A0AEC0; font-size: 14px; transition: color .2s; }
.bc-footer ul a:hover { color: var(--bc-accent); }
.bc-footer__contact { font-size: 14px; line-height: 1.7; }
.bc-footer__contact strong { color: #fff; }
.bc-footer__contact a { color: var(--bc-accent); }
.bc-footer__bar {
    border-top: 1px solid rgba(255,255,255,.08);
    margin-top: 48px;
    padding-top: 24px;
    display: flex; justify-content: space-between; align-items: center;
    max-width: var(--bc-container);
    margin-left: auto; margin-right: auto;
    padding-left: 24px; padding-right: 24px;
    font-size: 13px;
    flex-wrap: wrap;
    gap: 12px;
}

/* ---------- 通用 mini 元素 ---------- */
.bc-badge {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 4px 10px;
    background: var(--bc-accent-50);
    color: var(--bc-accent-600);
    border-radius: var(--bc-r-pill);
    font-size: 12px;
    font-weight: 600;
}
.bc-badge--primary { background: var(--bc-primary-50); color: var(--bc-primary); }
.bc-badge--orange  { background: #FFF0EA; color: var(--bc-cta); }
.bc-divider { height: 1px; background: var(--bc-border); margin: 48px 0; }

.bc-empty {
    text-align: center;
    padding: 64px 24px;
    color: var(--bc-text-muted);
}
.bc-empty svg { width: 64px; height: 64px; opacity: .4; margin: 0 auto 16px; }

/* ---------- 产品卡片 (复用旧逻辑) ---------- */
.bc-product-card {
    background: var(--bc-surface);
    border: 1px solid var(--bc-border-soft);
    border-radius: var(--bc-r-lg);
    overflow: hidden;
    transition: all .3s;
    display: flex;
    flex-direction: column;
    height: 100%;
}
.bc-product-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--bc-s-3);
    border-color: var(--bc-accent);
}
.bc-product-card__img {
    aspect-ratio: 4/3;
    width: 100%;
    object-fit: contain;   /* 默认完整显示不裁字(单品/全局可另配 cover/stretch,由内联 style 覆盖) */
    padding: 12px;
    box-sizing: border-box;
    background: #fff;
    border-bottom: 3px solid var(--bc-primary);
    background: var(--bc-border-soft);
}
.bc-product-card__img[src$="default-product.svg"] {
    object-fit: contain;
    padding: 8%;
    background: linear-gradient(135deg, #F7FAFC, #EDF2F7);
}
.bc-product-card__body { padding: 20px; flex: 1; display: flex; flex-direction: column; }
.bc-product-card__title {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--bc-primary);
    margin-bottom: 6px;
    line-height: 1.3;
}
.bc-product-card__brand {
    display: block;
    font-size: 12px;
    color: var(--bc-text-muted);
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 1px;
}
.bc-product-card__desc {
    font-size: 14px;
    color: var(--bc-text-soft);
    line-height: 1.6;
    margin-bottom: 16px;
    flex: 1;
}
.bc-product-card__specs {
    margin-bottom: 16px;
    padding: 12px 14px;
    background: var(--bc-bg);
    border-radius: var(--bc-r-md);
    font-size: 12px;
}
.bc-product-card__specs strong {
    display: block;
    color: var(--bc-text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 6px;
    font-size: 11px;
}
.bc-product-card__specs li { padding: 2px 0; color: var(--bc-text); }
.bc-product-card__cta { width: 100%; }

/* ---------- 流程时间线 / 时间轴 ---------- */
.bc-stepper {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 24px;
    position: relative;
}
.bc-step {
    background: var(--bc-surface);
    border-radius: var(--bc-r-lg);
    padding: 28px 24px;
    text-align: center;
    border: 1px solid var(--bc-border-soft);
    position: relative;
}
.bc-step__num {
    width: 56px; height: 56px;
    background: linear-gradient(135deg, var(--bc-primary), var(--bc-accent));
    color: #fff;
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-size: 24px; font-weight: 800;
    margin: 0 auto 18px;
    box-shadow: 0 8px 16px rgba(0, 181, 216, .25);
}
.bc-step h3 { font-size: 1.05rem; margin-bottom: 8px; color: var(--bc-primary); }
.bc-step p  { font-size: 14px; color: var(--bc-text-soft); }

/* 时间轴(About 发展历程) */
.bc-timeline {
    position: relative;
    max-width: 800px; margin: 0 auto;
    padding: 20px 0;
}
.bc-timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    background: linear-gradient(to bottom, var(--bc-accent), var(--bc-primary));
    top: 0; bottom: 0;
    border-radius: 2px;
}
.bc-timeline__item {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 24px;
    margin-bottom: 24px;
    align-items: center;
}
.bc-timeline__year {
    text-align: right;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--bc-primary);
}
.bc-timeline__dot {
    width: 16px; height: 16px;
    background: var(--bc-accent);
    border: 4px solid #fff;
    border-radius: 50%;
    box-shadow: 0 0 0 2px var(--bc-accent);
    position: relative;
    z-index: 1;
}
.bc-timeline__content {
    background: var(--bc-surface);
    border: 1px solid var(--bc-border-soft);
    border-radius: var(--bc-r-md);
    padding: 16px 20px;
    box-shadow: var(--bc-s-1);
}
.bc-timeline__content h4 { font-size: 15px; color: var(--bc-primary); margin-bottom: 4px; }
.bc-timeline__content p { font-size: 13px; color: var(--bc-text-soft); }

/* ---------- 表单 ---------- */
.bc-form { max-width: 560px; }
.bc-form label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--bc-text);
    margin-bottom: 6px;
}
.bc-form input, .bc-form select, .bc-form textarea {
    width: 100%;
    padding: 10px 14px;
    border: 1.5px solid var(--bc-border);
    border-radius: var(--bc-r-md);
    background: var(--bc-surface);
    transition: border-color .2s, box-shadow .2s;
    font-size: 14px;
}
.bc-form input:focus, .bc-form select:focus, .bc-form textarea:focus {
    outline: none;
    border-color: var(--bc-accent);
    box-shadow: 0 0 0 3px rgba(0, 181, 216, .15);
}
.bc-form textarea { resize: vertical; min-height: 120px; }
.bc-form .bc-form-grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

/* ---------- 博客列表 ---------- */
.bc-blog {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
}
.bc-blog__item {
    display: grid;
    grid-template-columns: 120px 1fr auto;
    gap: 20px;
    align-items: center;
    padding: 20px 24px;
    background: var(--bc-surface);
    border: 1px solid var(--bc-border-soft);
    border-radius: var(--bc-r-lg);
    transition: all .2s;
}
.bc-blog__item:hover {
    transform: translateX(4px);
    box-shadow: var(--bc-s-2);
    border-color: var(--bc-accent);
}
.bc-blog__date {
    font-size: 12px;
    color: var(--bc-text-muted);
    text-align: center;
    border-right: 1px solid var(--bc-border);
    padding-right: 16px;
}
.bc-blog__date strong { display: block; font-size: 22px; color: var(--bc-primary); font-weight: 800; line-height: 1; margin-bottom: 4px; }
.bc-blog__body h4 { font-size: 16px; font-weight: 700; color: var(--bc-primary); margin-bottom: 6px; line-height: 1.4; }
.bc-blog__body p { font-size: 13px; color: var(--bc-text-soft); line-height: 1.6; }
.bc-blog__more { color: var(--bc-accent); font-weight: 600; font-size: 13px; }

/* ---------- 面包屑 ---------- */
.bc-breadcrumb {
    max-width: var(--bc-container);
    margin: 0 auto;
    padding: 16px 24px 0;
    font-size: 13px;
    color: var(--bc-text-muted);
}
.bc-breadcrumb a { color: var(--bc-text-muted); }
.bc-breadcrumb a:hover { color: var(--bc-primary); }
.bc-breadcrumb span.sep { margin: 0 8px; opacity: .5; }

/* ---------- 分页 ---------- */
.bc-pagination { display: flex; gap: 6px; justify-content: center; margin: 40px 0; flex-wrap: wrap; }
.bc-pagination a {
    padding: 8px 14px;
    border-radius: var(--bc-r-sm);
    background: var(--bc-surface);
    border: 1px solid var(--bc-border);
    color: var(--bc-text);
    font-size: 14px;
    transition: all .2s;
}
.bc-pagination a:hover { border-color: var(--bc-accent); color: var(--bc-accent); }
.bc-pagination a.is-active { background: var(--bc-primary); color: #fff; border-color: var(--bc-primary); }

/* ---------- 响应式 ---------- */
@media (max-width: 960px) {
    .bc-footer__grid { grid-template-columns: 1fr 1fr; gap: 32px; }
    .bc-bc-grid-3, .bc-grid-3 { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
    .bc-section { padding: 56px 0; }
    .bc-nav { display: none; }
    .bc-nav.is-open {
        display: flex; flex-direction: column;
        position: absolute; top: var(--bc-header-h); left: 0; right: 0;
        background: #fff;
        padding: 16px;
        border-bottom: 1px solid var(--bc-border);
        box-shadow: var(--bc-s-3);
        align-items: stretch;
        gap: 4px;
    }
    .bc-nav.is-open .bc-nav__link { padding: 12px 16px; text-align: left; }
    .bc-nav-toggle { display: flex; }
    .bc-hero { padding: 64px 0; }
    .bc-footer__grid { grid-template-columns: 1fr; }
    .bc-filter { flex-direction: column; align-items: stretch; }
    .bc-search { min-width: 0; }
    .bc-timeline__item { grid-template-columns: 40px 1fr; gap: 16px; }
    .bc-timeline::before { left: 20px; }
    .bc-timeline__year { display: none; }
    .bc-timeline__content::before {
        content: '';
        position: absolute; left: -28px; top: 16px;
        border: 6px solid transparent; border-right-color: var(--bc-surface);
    }
    .bc-blog__item { grid-template-columns: 1fr; gap: 12px; padding: 18px; }
    .bc-blog__date { display: flex; justify-content: center; gap: 8px; align-items: center; text-align: left; border-right: none; border-bottom: 1px solid var(--bc-border); padding: 0 0 12px 0; }
    .bc-blog__date strong { display: inline; margin: 0; font-size: 18px; }
    .bc-form .bc-form-grid-2 { grid-template-columns: 1fr; }
    .bc-hero__circuit { display: none; }
}

/* ---------- 动画 ---------- */
@keyframes bc-fade-in {
    from { opacity: 0; transform: translateY(12px); }
    to   { opacity: 1; transform: translateY(0); }
}
.bc-fade-in { animation: bc-fade-in .5s ease-out both; }