/* ============================================================
 * V16 升级层 ——「钢构·朱砂」工业质感设计系统
 * 加载于 main.min.css 之后，只做覆盖与增强，不修改原文件。
 * 命名空间：新增变量 sd-*，新增类 v16-*
 * 版本：20261016
 * ============================================================ */

:root {
    /* 深钢色板 */
    --sd-ink: #17191d;          /* 最深底色 */
    --sd-ink-2: #1e2126;        /* 面板底 */
    --sd-steel: #262a31;        /* 钢灰面板 */
    --sd-steel-line: rgba(255, 255, 255, 0.09);
    --sd-primary: #c8161e;      /* 品牌朱红（与主站一致） */
    --sd-primary-bright: #e22530;
    --sd-primary-deep: #8f0f15;
    --sd-text-inv: #f4f5f7;
    --sd-text-inv-dim: rgba(244, 245, 247, 0.62);
    --sd-bg-soft: #f6f7f8;      /* 浅区底色 */
    --sd-num-font: "DIN Alternate", "Bahnschrift", "Segoe UI", "Roboto Mono", "Arial Narrow", sans-serif;
    --sd-ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --sd-ease-back: cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ---------- 全局细节 ---------- */
::selection { background: var(--sd-primary); color: #fff; }

/* ---------- 顶部条与头部：深钢化 ---------- */
.header-top {
    background: var(--sd-ink);
    border-bottom: 1px solid var(--sd-steel-line);
    font-size: 13px;
}
.header-top .welcome { color: var(--sd-text-inv-dim); letter-spacing: 0.5px; }
.header-top .contact-info svg { fill: var(--sd-primary-bright); }
.header-top a span { transition: color 0.25s; }
.header-top a:hover span { color: #fff; }

.header {
    background: #fff;
    box-shadow: 0 1px 0 rgba(0, 0, 0, 0.06), 0 8px 24px rgba(23, 25, 29, 0.06);
}
.header-main { padding: 16px 0; }

.logo-icon {
    background: linear-gradient(150deg, var(--sd-primary) 0%, var(--sd-primary-deep) 100%);
    border-radius: 10px;
    box-shadow: 0 4px 14px rgba(200, 22, 30, 0.32), inset 0 1px 0 rgba(255, 255, 255, 0.22);
}
.logo-text .logo-name {
    background: linear-gradient(180deg, #2b2b2b 30%, #4a4d52 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}
.header-contact-item .icon {
    background: linear-gradient(150deg, #fff, #eceef0);
    border: 1px solid rgba(0, 0, 0, 0.05);
    transition: transform 0.3s var(--sd-ease-out), border-color 0.3s;
}
.header-contact-item:hover .icon {
    transform: translateY(-2px);
    border-color: rgba(200, 22, 30, 0.35);
}
.header-contact-item strong { font-family: var(--sd-num-font); letter-spacing: 0.5px; }

/* ---------- 主导航：金属深红 ---------- */
.nav {
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.06) 0%, rgba(0, 0, 0, 0.12) 100%),
        linear-gradient(92deg, #a41017 0%, #c8161e 45%, #b01218 100%);
    box-shadow: 0 2px 12px rgba(143, 15, 21, 0.35);
}
.nav-list a {
    font-weight: 500;
    letter-spacing: 1px;
    position: relative;
    transition: background-color 0.25s;
}
.nav-list a::after {
    content: "";
    position: absolute;
    left: 50%;
    bottom: 0;
    width: 0;
    height: 3px;
    background: #fff;
    transform: translateX(-50%);
    transition: width 0.3s var(--sd-ease-out);
}
.nav-list a:hover::after,
.nav-list a.active::after { width: 60%; }
.nav-list a.active { background: rgba(0, 0, 0, 0.22); }
.nav-list a:hover { background: rgba(0, 0, 0, 0.16); }

/* 搜索框 */
.search-box {
    background: rgba(255, 255, 255, 0.14);
    border: 1px solid rgba(255, 255, 255, 0.22);
    border-radius: 20px;
    transition: background-color 0.25s, border-color 0.25s;
}
.search-box:focus-within {
    background: #fff;
    border-color: #fff;
}
.search-box:focus-within input { color: #2b2b2b; }
.search-box:focus-within .search-icon { fill: var(--sd-primary); }

/* ============================================================
 * HERO Banner 重塑
 * ============================================================ */
.banner {
    height: 560px;
    background: var(--sd-ink);
}

/* 工程网格纹理层（叠加在每张slide上） */
.banner-slide::after {
    content: "";
    position: absolute;
    inset: 0;
    z-index: 1;
    pointer-events: none;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
    background-size: 56px 56px;
    -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9) 0%, rgba(0, 0, 0, 0.25) 55%, rgba(0, 0, 0, 0.55) 100%);
    mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9) 0%, rgba(0, 0, 0, 0.25) 55%, rgba(0, 0, 0, 0.55) 100%);
}

/* 底部渐隐接缝（压住slide渐变的亮角） */
.banner::after {
    content: "";
    position: absolute;
    left: 0; right: 0; bottom: 0;
    height: 130px;
    z-index: 2;
    pointer-events: none;
    background: linear-gradient(180deg, rgba(23, 25, 29, 0) 0%, rgba(23, 25, 29, 0.55) 62%, var(--sd-ink) 100%);
}

/* 扫光特效：一道斜向高光周期性掠过 */
.banner .v16-shine {
    position: absolute;
    top: -60%;
    left: -35%;
    width: 34%;
    height: 220%;
    z-index: 3;
    pointer-events: none;
    background: linear-gradient(100deg, transparent 0%, rgba(255, 255, 255, 0.05) 38%, rgba(255, 255, 255, 0.12) 50%, rgba(255, 255, 255, 0.05) 62%, transparent 100%);
    transform: skewX(-18deg);
    animation: v16Shine 7.5s var(--sd-ease-out) infinite;
}
@keyframes v16Shine {
    0% { left: -40%; opacity: 0; }
    8% { opacity: 1; }
    45% { left: 118%; opacity: 0; }
    100% { left: 118%; opacity: 0; }
}

/* hero 文字排版 */
.banner-content { max-width: 860px; }
.banner-content .v16-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 14px;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 6px;
    color: #ffb3b7;
    text-transform: uppercase;
    margin-bottom: 18px;
    opacity: 0;
    animation: v16Rise 0.8s var(--sd-ease-out) 0.15s forwards;
}
.banner-content .v16-eyebrow::before,
.banner-content .v16-eyebrow::after {
    content: "";
    width: 34px;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255, 179, 183, 0.8));
}
.banner-content .v16-eyebrow::after {
    background: linear-gradient(90deg, rgba(255, 179, 183, 0.8), transparent);
}
.banner-content h1,
.banner-content h2 {
    font-size: 50px;
    font-weight: 900;
    letter-spacing: 3px;
    line-height: 1.18;
    margin-bottom: 18px;
    text-shadow: 0 2px 1px rgba(0, 0, 0, 0.55), 0 4px 26px rgba(0, 0, 0, 0.5);
    opacity: 0;
    animation: v16Rise 0.9s var(--sd-ease-out) 0.3s forwards;
}
.banner-content p {
    font-size: 17px;
    font-weight: 300;
    letter-spacing: 2.5px;
    color: rgba(255, 255, 255, 0.86);
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.45);
    margin-bottom: 34px;
    opacity: 0;
    animation: v16Rise 0.9s var(--sd-ease-out) 0.5s forwards;
}
@keyframes v16Rise {
    from { opacity: 0; transform: translateY(26px); }
    to { opacity: 1; transform: translateY(0); }
}

/* hero 双按钮 */
.banner-content .v16-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    opacity: 0;
    animation: v16Rise 0.9s var(--sd-ease-out) 0.68s forwards;
}
.banner-content .v16-actions .btn,
.banner-content .v16-actions .btn-outline {
    position: relative;
    overflow: hidden;
    border-radius: 4px;
    padding: 14px 38px;
    font-size: 15px;
    font-weight: 600;
    letter-spacing: 3px;
    min-height: 48px;
    border: 0;
}
.banner-content .v16-actions .btn {
    background: linear-gradient(135deg, var(--sd-primary-bright) 0%, var(--sd-primary) 55%, #a41017 100%);
    box-shadow: 0 6px 22px rgba(200, 22, 30, 0.42);
    transition: transform 0.28s var(--sd-ease-out), box-shadow 0.28s;
}
.banner-content .v16-actions .btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(226, 37, 48, 0.5);
    background: linear-gradient(135deg, var(--sd-primary-bright) 0%, var(--sd-primary) 55%, #a41017 100%);
    color: #fff;
}
/* 按钮扫光 */
.banner-content .v16-actions .btn::before {
    content: "";
    position: absolute;
    top: 0;
    left: -80%;
    width: 45%;
    height: 100%;
    background: linear-gradient(100deg, transparent, rgba(255, 255, 255, 0.35), transparent);
    transform: skewX(-22deg);
    transition: left 0.55s var(--sd-ease-out);
}
.banner-content .v16-actions .btn:hover::before { left: 130%; }

.banner-content .v16-actions .btn-outline {
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.38);
    color: #fff;
    backdrop-filter: blur(2px);
    transition: background-color 0.28s, border-color 0.28s, transform 0.28s var(--sd-ease-out);
}
.banner-content .v16-actions .btn-outline:hover {
    background: rgba(200, 22, 30, 0.18);
    border-color: var(--sd-primary-bright);
    transform: translateY(-3px);
    color: #fff;
    box-shadow: 0 0 0 1px rgba(226, 37, 48, 0.3), 0 0 26px rgba(200, 22, 30, 0.4), inset 0 0 14px rgba(226, 37, 48, 0.12);
}

/* 兼容旧结构（无 v16-actions 包裹时，单个btn保持增强样式） */
.banner-content > .btn {
    border-radius: 4px;
    position: relative;
    overflow: hidden;
    padding: 14px 38px;
    font-weight: 600;
    letter-spacing: 3px;
    background: linear-gradient(135deg, var(--sd-primary-bright) 0%, var(--sd-primary) 55%, #a41017 100%);
    box-shadow: 0 6px 22px rgba(200, 22, 30, 0.42);
    opacity: 0;
    animation: v16Rise 0.9s var(--sd-ease-out) 0.68s forwards;
}

/* 轮播指示点与箭头 */
.banner-dots { bottom: 30px; z-index: 4; }
.banner-dots .dot {
    width: 26px; height: 3px;
    border-radius: 2px;
    background: rgba(255, 255, 255, 0.32);
    transition: background-color 0.3s, width 0.3s var(--sd-ease-out);
}
.banner-dots .dot.active { width: 42px; background: var(--sd-primary-bright); }
.banner-arrow {
    z-index: 4;
    background: rgba(20, 22, 26, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.22);
    backdrop-filter: blur(4px);
    transition: background-color 0.25s, transform 0.25s;
}
.banner-arrow:hover { background: var(--sd-primary); border-color: var(--sd-primary); }
.banner-arrow svg { fill: #fff; }

/* ============================================================
 * 指标数据条（hero 正下方，首页专属）
 * ============================================================ */
.v16-trustbar {
    background: var(--sd-ink);
    color: var(--sd-text-inv);
    padding: 34px 0 42px;
    border-top: 1px solid var(--sd-steel-line);
    position: relative;
}
.v16-trustbar::before {
    content: "";
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(90deg, transparent 0%, var(--sd-primary) 18%, var(--sd-primary-bright) 50%, var(--sd-primary) 82%, transparent 100%);
}
.v16-trustbar-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
}
.v16-trust-item {
    text-align: center;
    padding: 14px 10px 12px;
    position: relative;
}
/* 竖向光柱分隔：1px 亮线 + 红色渐隐晕 */
.v16-trust-item + .v16-trust-item::before {
    content: "";
    position: absolute;
    left: -6.5px;
    top: 22%;
    bottom: 22%;
    width: 1px;
    background: linear-gradient(180deg, transparent, rgba(255, 255, 255, 0.22) 30%, rgba(226, 37, 48, 0.55) 50%, rgba(255, 255, 255, 0.22) 70%, transparent);
}
.v16-trust-item .v16-num {
    font-family: var(--sd-num-font);
    font-size: 42px;
    font-weight: 700;
    line-height: 1;
    color: #fff;
    letter-spacing: 1px;
}
.v16-trust-item .v16-num em {
    font-style: normal;
    color: var(--sd-primary-bright);
    font-size: 0.55em;
    margin-left: 2px;
    vertical-align: 0.28em;
}
/* 数字下方红色锚点块 */
.v16-trust-item .v16-num::after {
    content: "";
    display: block;
    width: 22px;
    height: 3px;
    margin: 12px auto 0;
    background: linear-gradient(90deg, var(--sd-primary), var(--sd-primary-bright));
    border-radius: 2px;
}
.v16-trust-item .v16-cap {
    margin-top: 12px;
    font-size: 13px;
    letter-spacing: 3px;
    color: var(--sd-text-inv-dim);
}

/* ============================================================
 * 区块标题系统（杂志感排版）
 * ============================================================ */
.section-title { margin-bottom: 44px; }
.section-title h2 {
    font-size: 32px;
    font-weight: 800;
    letter-spacing: 2px;
    position: relative;
    display: inline-block;
    padding-bottom: 16px;
}
.section-title h2::after {
    content: "";
    position: absolute;
    left: 50%;
    bottom: 0;
    transform: translateX(-50%);
    width: 44px;
    height: 4px;
    border-radius: 2px;
    background: linear-gradient(90deg, var(--sd-primary) 0%, var(--sd-primary-bright) 100%);
    box-shadow: 0 1px 6px rgba(200, 22, 30, 0.4);
}
.section-title p {
    margin-top: 10px;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 5px;
    text-transform: uppercase;
    color: #9aa0a8;
}

/* ============================================================
 * 产品分类筛选 + 卡片
 * ============================================================ */
.product-categories { gap: 10px; }
.category-tab {
    border: 1px solid rgba(0, 0, 0, 0.12);
    border-radius: 3px;
    padding: 8px 22px;
    font-size: 14px;
    font-weight: 500;
    color: #4a4d52;
    background: #fff;
    transition: all 0.25s var(--sd-ease-out);
    position: relative;
}
.category-tab:hover {
    color: var(--sd-primary);
    border-color: rgba(200, 22, 30, 0.45);
    transform: translateY(-2px);
    box-shadow: 0 5px 14px rgba(200, 22, 30, 0.12);
}
.category-tab.active {
    background: linear-gradient(135deg, var(--sd-primary) 0%, #a41017 100%);
    border-color: transparent;
    color: #fff;
    box-shadow: 0 5px 16px rgba(200, 22, 30, 0.35);
}

.product-card {
    background: #fff;
    border: 1px solid rgba(0, 0, 0, 0.07);
    border-radius: 8px;
    overflow: hidden;
    position: relative;
    transition: transform 0.35s var(--sd-ease-out), box-shadow 0.35s, border-color 0.35s;
}
.product-card::after {
    content: "";
    position: absolute;
    left: 0; right: 0; bottom: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--sd-primary), var(--sd-primary-bright));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s var(--sd-ease-out);
    z-index: 2;
}
.product-card:hover {
    transform: translateY(-7px);
    box-shadow: 0 18px 44px rgba(23, 25, 29, 0.16);
    border-color: rgba(200, 22, 30, 0.28);
}
.product-card:hover::after { transform: scaleX(1); }
.product-card-img { overflow: hidden; }
.product-card-img img,
.product-card-img source { transition: transform 0.55s var(--sd-ease-out); }
.product-card:hover .product-card-img img { transform: scale(1.07); }
.product-card-body {
    padding: 18px 20px 22px;
    position: relative;
}
.product-card-body h3 {
    font-size: 18px;
    font-weight: 700;
    letter-spacing: 1px;
    margin-bottom: 8px;
    transition: color 0.25s;
}
.product-card:hover .product-card-body h3 { color: var(--sd-primary); }
.product-card-body p { font-size: 13.5px; color: #767b83; }

/* ============================================================
 * 案例滚动墙
 * ============================================================ */
.cases-section { background: var(--sd-bg-soft); position: relative; }
.case-card {
    background: #fff;
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid rgba(0, 0, 0, 0.06);
    transition: transform 0.35s var(--sd-ease-out), box-shadow 0.35s;
    position: relative;
}
.case-card:hover {
    transform: translateY(-7px);
    box-shadow: 0 18px 44px rgba(23, 25, 29, 0.18);
}
.case-card-img { overflow: hidden; position: relative; }
.case-card-img img { transition: transform 0.55s var(--sd-ease-out); }
.case-card:hover .case-card-img img { transform: scale(1.06); }
.case-card-img::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 55%, rgba(23, 25, 29, 0.55) 100%);
    opacity: 0;
    transition: opacity 0.4s;
    pointer-events: none;
}
.case-card:hover .case-card-img::after { opacity: 1; }
.case-label {
    position: absolute;
    top: 12px; left: 12px;
    z-index: 2;
    background: var(--sd-primary);
    color: #fff;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 2px;
    padding: 3px 12px 3px 10px;
    border-radius: 2px;
    clip-path: polygon(0 0, calc(100% - 7px) 0, 100% 50%, calc(100% - 7px) 100%, 0 100%);
}
.case-card-body h3 { font-size: 17px; font-weight: 700; transition: color 0.25s; }
.case-card:hover .case-card-body h3 { color: var(--sd-primary); }

/* ============================================================
 * 关于我们区（首页）
 * ============================================================ */
.about-section { position: relative; }
.about-image-box {
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 22px 54px rgba(23, 25, 29, 0.18);
    position: relative;
}
.about-image-box::before {
    content: "";
    position: absolute;
    inset: 14px;
    border: 1px solid rgba(255, 255, 255, 0.35);
    border-radius: 6px;
    z-index: 2;
    pointer-events: none;
}
.about-content h2 {
    font-size: 32px;
    font-weight: 800;
    letter-spacing: 2px;
    position: relative;
    padding-left: 16px;
}
.about-content h2::before {
    content: "";
    position: absolute;
    left: 0; top: 6px; bottom: 6px;
    width: 4px;
    border-radius: 2px;
    background: linear-gradient(180deg, var(--sd-primary), var(--sd-primary-bright));
}
.about-content .subtitle {
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 5px;
    text-transform: uppercase;
    color: #9aa0a8;
    margin: 6px 0 18px;
}
.about-stats {
    border-top: 1px solid rgba(0, 0, 0, 0.08);
    padding-top: 22px;
}
.about-stat .num {
    font-family: var(--sd-num-font);
    font-size: 34px;
    font-weight: 700;
    color: var(--sd-primary);
    line-height: 1.1;
}
.about-stat .num[data-count] { color: #2b2b2b; }
.stat-box {
    background: linear-gradient(150deg, var(--sd-primary) 0%, var(--sd-primary-deep) 100%);
    box-shadow: 0 10px 26px rgba(200, 22, 30, 0.38);
    border-radius: 8px;
}
.stat-box .number { font-family: var(--sd-num-font); }

/* ============================================================
 * 优势区：深色钢构反转
 * ============================================================ */
.advantages-section {
    background:
        radial-gradient(1200px 500px at 85% -10%, rgba(200, 22, 30, 0.16), transparent 60%),
        linear-gradient(180deg, var(--sd-ink) 0%, var(--sd-ink-2) 100%);
    color: var(--sd-text-inv);
    position: relative;
    overflow: hidden;
}
.advantages-section::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
    background-size: 48px 48px;
    pointer-events: none;
}
.advantages-section .section-title h2 { color: #fff; }
.advantages-section .section-title p { color: var(--sd-text-inv-dim); }
.advantage-card {
    background: rgba(255, 255, 255, 0.045);
    border: 1px solid var(--sd-steel-line);
    border-radius: 10px;
    padding: 34px 26px;
    backdrop-filter: blur(3px);
    transition: transform 0.35s var(--sd-ease-out), background-color 0.35s, border-color 0.35s;
    position: relative;
    overflow: hidden;
}
.advantage-card::before {
    content: "";
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--sd-primary), var(--sd-primary-bright));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s var(--sd-ease-out);
}
.advantage-card:hover {
    transform: translateY(-7px);
    background: rgba(255, 255, 255, 0.07);
    border-color: rgba(226, 37, 48, 0.4);
}
.advantage-card:hover::before { transform: scaleX(1); }
.advantage-card h3 {
    color: #fff;
    font-size: 19px;
    font-weight: 700;
    letter-spacing: 4px;
}
.advantage-card p { color: var(--sd-text-inv-dim); font-size: 14px; }
.advantage-icon {
    width: 58px; height: 58px;
    border-radius: 12px;
    background: linear-gradient(150deg, rgba(200, 22, 30, 0.28), rgba(200, 22, 30, 0.1));
    border: 1px solid rgba(226, 37, 48, 0.35);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.35s var(--sd-ease-back), box-shadow 0.35s;
}
.advantage-icon svg { fill: var(--sd-primary-bright); }
.advantage-card:hover .advantage-icon {
    transform: scale(1.1) rotate(-4deg);
    box-shadow: 0 8px 22px rgba(200, 22, 30, 0.3);
}

/* ============================================================
 * 新闻区
 * ============================================================ */
.news-section { background: var(--sd-bg-soft); }
.news-featured, .news-item {
    background: #fff;
    border: 1px solid rgba(0, 0, 0, 0.06);
    border-radius: 8px;
    overflow: hidden;
    transition: transform 0.35s var(--sd-ease-out), box-shadow 0.35s;
}
.news-featured:hover, .news-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 16px 38px rgba(23, 25, 29, 0.14);
}
.news-featured-img, .news-item img { transition: transform 0.5s var(--sd-ease-out); }
.news-featured:hover .news-featured-img img { transform: scale(1.05); }
.news-date-box {
    font-family: var(--sd-num-font);
    background: var(--sd-ink);
}
.news-item h3 a, .news-featured-body h3 { transition: color 0.25s; }
.news-item:hover h3 a, .news-featured:hover .news-featured-body h3 { color: var(--sd-primary); }
.read-more { color: var(--sd-primary); font-weight: 600; }

/* ============================================================
 * 通用按钮（正文区）
 * ============================================================ */
.btn-main {
    position: relative;
    overflow: hidden;
    border-radius: 4px;
    font-weight: 600;
    letter-spacing: 2px;
    background: linear-gradient(135deg, var(--sd-primary) 0%, #a41017 100%);
    box-shadow: 0 5px 16px rgba(200, 22, 30, 0.3);
    transition: transform 0.28s var(--sd-ease-out), box-shadow 0.28s;
}
.btn-main:hover {
    background: linear-gradient(135deg, var(--sd-primary) 0%, #a41017 100%);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 9px 26px rgba(200, 22, 30, 0.4);
}
.btn-submit {
    border-radius: 4px;
    font-weight: 600;
    letter-spacing: 3px;
    background: linear-gradient(135deg, var(--sd-primary) 0%, #a41017 100%);
    box-shadow: 0 5px 16px rgba(200, 22, 30, 0.3);
    transition: transform 0.28s var(--sd-ease-out), box-shadow 0.28s;
}
.btn-submit:hover {
    background: linear-gradient(135deg, var(--sd-primary) 0%, #a41017 100%);
    transform: translateY(-2px);
    box-shadow: 0 9px 26px rgba(200, 22, 30, 0.42);
}

/* ============================================================
 * 内页头图 page-banner：深钢 + 网格 + 红线
 * ============================================================ */
.page-banner {
    background:
        radial-gradient(900px 300px at 80% 130%, rgba(200, 22, 30, 0.28), transparent 65%),
        linear-gradient(135deg, var(--sd-ink) 0%, #23262c 55%, #2a1a1c 100%);
    padding: 72px 0;
    position: relative;
    overflow: hidden;
}
.page-banner::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
    background-size: 52px 52px;
    pointer-events: none;
}
.page-banner::after {
    content: "";
    position: absolute;
    left: 0; right: 0; bottom: 0;
    height: 3px;
    background: linear-gradient(90deg, transparent, var(--sd-primary) 22%, var(--sd-primary-bright) 50%, var(--sd-primary) 78%, transparent);
}
.page-banner h1, .page-banner h2 {
    font-size: 38px;
    font-weight: 800;
    letter-spacing: 3px;
    position: relative;
}
.page-banner p {
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 6px;
    color: rgba(255, 255, 255, 0.55);
}
.breadcrumb { background: var(--sd-bg-soft); }

/* ============================================================
 * Footer：深钢化
 * ============================================================ */
.footer {
    background:
        radial-gradient(900px 380px at 12% 0%, rgba(200, 22, 30, 0.1), transparent 55%),
        var(--sd-ink);
    color: var(--sd-text-inv-dim);
    position: relative;
}
.footer::before {
    content: "";
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(226, 37, 48, 0.55), transparent);
}
.footer h3, .footer h4, .footer .footer-title { color: #fff; }
.footer a { color: var(--sd-text-inv-dim); transition: color 0.25s; }
.footer a:hover { color: var(--sd-primary-bright); }
.footer-bottom {
    border-top: 1px solid var(--sd-steel-line);
    background: rgba(0, 0, 0, 0.25);
}

/* ============================================================
 * 浮动侧栏与回顶
 * ============================================================ */
.float-btn {
    border-radius: 8px;
    box-shadow: 0 8px 24px rgba(23, 25, 29, 0.22);
    transition: transform 0.28s var(--sd-ease-out), box-shadow 0.28s;
}
.float-btn:hover { transform: translateY(-4px); }

.v16-trust-item .v16-num .num {
    font-family: inherit;
    font-size: inherit;
    font-weight: inherit;
    color: inherit;
    display: inline;
}

/* ============================================================
 * 内页卡片统一增强（products/cases/news/contact/about页）
 * ============================================================ */
.products-page-grid .product-card,
.case-page-card,
.news-page-item,
.about-showcase .showcase-item,
.culture-card,
.contact-info-card,
.faq-item {
    border-radius: 10px;
    transition: transform 0.35s var(--sd-ease-out), box-shadow 0.35s, border-color 0.35s;
}
.case-page-card:hover,
.news-page-item:hover,
.culture-card:hover,
.contact-info-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 18px 44px rgba(23, 25, 29, 0.15);
    border-color: rgba(200, 22, 30, 0.25);
}
.case-page-card-img img, .news-page-item-img img { transition: transform 0.55s var(--sd-ease-out); }
.case-page-card:hover .case-page-card-img img,
.news-page-item:hover .news-page-item-img img { transform: scale(1.06); }
.case-page-card-body h3, .news-page-item-body h3 { transition: color 0.25s; }
.case-page-card:hover .case-page-card-body h3,
.news-page-item:hover .news-page-item-body h3 { color: var(--sd-primary); }

.showcase-overlay { background: linear-gradient(180deg, transparent 30%, rgba(23, 25, 29, 0.82) 100%); }

/* about 页 hero 统计数字字体 */
.about-hero .about-stat .num,
.about-stats .num { font-family: var(--sd-num-font); }

/* 表单聚焦态 */
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    border-color: var(--sd-primary) !important;
    box-shadow: 0 0 0 3px rgba(200, 22, 30, 0.12);
}

/* ============================================================
 * 响应式
 * ============================================================ */
@media (max-width: 992px) {
    .v16-trustbar-grid { grid-template-columns: repeat(2, 1fr); row-gap: 26px; }
    /* 2列布局：第3项为第二行行首，去掉竖线 */
    .v16-trust-item:nth-child(3)::before { display: none; }
    .banner-content h1, .banner-content h2 { font-size: 40px; }
}

@media (max-width: 768px) {
    .banner { height: 470px; }
    .banner-content h1, .banner-content h2 { font-size: 31px; letter-spacing: 2px; }
    .banner-content p { font-size: 14px; letter-spacing: 1.5px; margin-bottom: 26px; }
    .banner-content .v16-eyebrow { font-size: 11px; letter-spacing: 4px; margin-bottom: 12px; }
    .banner-content .v16-actions .btn,
    .banner-content .v16-actions .btn-outline { padding: 12px 26px; letter-spacing: 2px; }
    .section-title h2 { font-size: 26px; }
    .v16-trustbar { padding: 20px 0 24px; }
    .v16-trust-item .v16-num { font-size: 30px; }
    .v16-trust-item .v16-cap { letter-spacing: 2px; }
    .about-content h2 { font-size: 26px; }
    .page-banner h1, .page-banner h2 { font-size: 28px; }
    .banner .v16-shine { display: none; }

    /* 悬浮栏改右下角横排，避免遮挡banner文字 */
    .float-sidebar {
        top: auto;
        bottom: 14px;
        right: 12px;
        transform: none;
        flex-direction: row;
        gap: 8px;
    }
    .float-btn {
        width: 44px;
        height: 44px;
        border-radius: 10px;
        box-shadow: 0 4px 16px rgba(0, 0, 0, 0.28);
    }
    .float-btn .tooltip { display: none !important; }
    /* banner文字区留出安全边距 */
    .banner-content { padding: 0 16px; }
    .banner-content > p:not(.v16-eyebrow) {
        font-size: 13.5px;
        letter-spacing: 1px;
        line-height: 1.8;
    }
    /* 轮播箭头贴边 */
    .banner-arrow.prev { left: 6px; }
    .banner-arrow.next { right: 6px; }
}

@media (max-width: 480px) {
    .v16-trustbar-grid { grid-template-columns: repeat(2, 1fr); gap: 6px; }
    .v16-trust-item { padding: 8px 4px 4px; }
    .v16-trust-item .v16-num { font-size: 26px; }
}

/* ============================================================
 * V16.1 增强（20261016b）
 * header sticky滚动收缩 / 阅读进度条 / hero多层网格 / page-banner层次
 * ============================================================ */

/* ---------- header 滚动状态 ---------- */
.header {
    position: sticky;
    top: 0;
    transition: box-shadow 0.3s ease;
}
.header.v16-scrolled {
    box-shadow: inset 0 -2px 0 rgba(200, 22, 30, 0.32), 0 4px 22px rgba(10, 12, 16, 0.16), 0 1px 0 rgba(10, 12, 16, 0.06);
}
/* 滚动后顶部信息条平滑收起（纯视觉收叠，不拦截焦点） */
.header-top {
    transition: max-height 0.35s var(--sd-ease-out), opacity 0.25s ease;
    overflow: hidden;
}
.header:not(.v16-scrolled) .header-top { max-height: 60px; }
.header.v16-scrolled .header-top { max-height: 0; opacity: 0; }
@media (prefers-reduced-motion: reduce) {
    .header-top { transition: none; }
}

/* ---------- 顶部阅读进度条（v16-extras.js 动态插入） ---------- */
.v16-progress {
    position: fixed;
    top: 0; left: 0;
    width: 100%;
    height: 3px;
    z-index: 9999;
    background: transparent;
    transform-origin: 0 50%;
    transform: scaleX(0);
    pointer-events: none;
}
.v16-progress::after {
    content: "";
    display: block;
    height: 100%;
    background: linear-gradient(90deg, var(--sd-primary) 0%, var(--sd-primary-bright) 70%, #ff6b70 100%);
    box-shadow: 0 0 8px rgba(226, 37, 48, 0.55);
}

/* ---------- hero 背景层次增强 ----------
 * ::before 是原生SVG工业剪影（main.css，不可覆盖）
 * ::after 是V16网格层：在此叠加中心聚光渐晕，合并为多重背景
 */
.banner-slide::after {
    background-image:
        radial-gradient(ellipse 62% 55% at 50% 46%, rgba(255, 255, 255, 0.05) 0%, transparent 70%),
        linear-gradient(rgba(255, 255, 255, 0.038) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.038) 1px, transparent 1px),
        linear-gradient(rgba(255, 255, 255, 0.018) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.018) 1px, transparent 1px),
        linear-gradient(180deg, rgba(10, 11, 14, 0.3) 0%, transparent 24%, transparent 74%, rgba(10, 11, 14, 0.44) 100%);
    background-size: auto, 130px 130px, 130px 130px, 26px 26px, 26px 26px, auto;
    -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9) 0%, rgba(0, 0, 0, 0.28) 55%, rgba(0, 0, 0, 0.55) 100%);
    mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9) 0%, rgba(0, 0, 0, 0.28) 55%, rgba(0, 0, 0, 0.55) 100%);
}
/* banner-content 要压住装饰层 */
.banner-content { position: relative; z-index: 3; }

/* ---------- 内页 page-banner 层次：已在上方定义3px红线，此处无需重复 ---------- */

/* ============================================================
 * 降级保护
 * ============================================================ */
/* 用户开启"减少动态效果"时关闭装饰动画 */
@media (prefers-reduced-motion: reduce) {
    .banner .v16-shine,
    .banner-content .v16-eyebrow,
    .banner-content h1,
    .banner-content h2,
    .banner-content p,
    .banner-content .v16-actions,
    .banner-content > .btn {
        animation: none !important;
        opacity: 1 !important;
    }
    * {
        transition-duration: 0.01s !important;
        scroll-behavior: auto !important;
    }
}