/* 寿光卫东化工 | 化学图谱·技术文档风格 */
:root {
    /* 方案V4指定纯色体系 */
    --color-primary: #2D3436;      /* 石墨蓝 */
    --color-secondary: #00B894;    /* 实验绿（仅用于认证/环保标识） */
    --color-accent: #E17055;       /* 检测橙（重点/CTA） */
    --color-bg: #FEFEFE;           /* 试剂白主背景 */
    --color-surface: #FFFFFF;
    --color-text: #2D3436;
    --color-muted: #4B5563;
    --color-border: #B2BEC3;       /* 仪器银 */
    --color-bg-gray: #F5F6FA;      /* 实验台灰分区 */
    --shadow-soft: 0 6px 16px rgba(0, 0, 0, 0.04);
    --max-width: 1400px;
    --header-height: 82px;
    --transition: 0.3s ease;
    --font-heading: "Source Han Sans SC", "Noto Sans SC", "Inter", Arial, sans-serif;
    --font-body: "Source Han Sans SC", "Noto Sans SC", "Inter", Arial, sans-serif;
    --radius-sm: 4px;
    --radius-md: 6px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
    font-family: var(--font-body);
    /* 外层用“实验台灰”，内容区再用“试剂白”，避免视觉上整页纯白 */
    background: var(--color-bg-gray);
    color: var(--color-text);
    line-height: 1.7;
    letter-spacing: 0.01em;
}

img { max-width: 100%; display: block; }
a { color: var(--color-primary); text-decoration: none; transition: color var(--transition), opacity var(--transition); }
a:hover { color: #1E2526; }
.link { color: var(--color-accent); font-weight: 600; }
.link:hover { color: var(--color-primary); }

.container {
    width: min(var(--max-width), calc(100% - 48px));
    margin: 0 auto;
}

.cert-bar {
    background: var(--color-bg-gray);
    border-bottom: 1px solid var(--color-border);
    font-size: 0.9rem;
}
.cert-bar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 10px 0;
    flex-wrap: wrap;
}
.cert-list { display: flex; align-items: center; gap: 0; flex-wrap: wrap; color: var(--color-text); }
.cert-item {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 0;
    border: none;
    border-radius: 0;
    background: transparent;
    font-weight: 600;
}
.cert-item + .cert-item::before {
    content: "/";
    margin: 0 8px;
    color: var(--color-border);
    font-weight: 400;
}
.contact-quick { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; color: var(--color-muted); }
.btn-text { font-weight: 700; }

.header-clean {
    position: sticky;
    top: 0;
    z-index: 999;
    background: #fff;
    border-bottom: 1px solid var(--color-border);
    height: var(--header-height);
    display: flex;
    align-items: center;
}
.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}
.brand {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--color-primary);
    font-weight: 800;
    letter-spacing: 0.01em;
}
.brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.brand-cn { display: block; font-size: 1.06rem; letter-spacing: 0; }
.brand-en { display: block; font-size: 0.84rem; color: var(--color-muted); letter-spacing: 0.12em; text-transform: uppercase; }

.nav-main ul { list-style: none; display: flex; align-items: center; gap: 12px; }
.nav-main a {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    color: var(--color-text);
    font-weight: 600;
}
.nav-main a:hover,
.nav-main .active { background: var(--color-bg-gray); }
.has-dropdown { position: relative; }
.dropdown-panel {
    position: absolute;
    top: calc(100% + 6px);
    left: 0;
    background: #fff;
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-soft);
    border-radius: var(--radius-md);
    padding: 14px;
    min-width: 280px;
    display: none;
}
.dropdown-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(160px, 1fr));
    gap: 8px;
}
.dropdown-item {
    padding: 10px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
    background: var(--color-bg-gray);
    color: var(--color-text);
}
.dropdown-item strong { display: block; color: var(--color-primary); }
.has-dropdown:hover .dropdown-panel,
.has-dropdown.open .dropdown-panel { display: block; }

.nav-actions { display: flex; align-items: center; gap: 10px; }
.nav-toggle {
    display: none;
    width: 42px;
    height: 42px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: #fff;
    font-size: 1.2rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 16px;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    font-weight: 700;
    cursor: pointer;
    background: transparent;
    transition: var(--transition);
}
.btn-primary {
    background: var(--color-primary);
    color: #fff;
}
.btn-primary:hover { background: #1E2526; }
.btn-outline {
    border-color: var(--color-primary);
    color: var(--color-primary);
}
.btn-outline:hover { background: var(--color-bg-gray); }
.btn-ghost {
    border-color: var(--color-border);
    color: var(--color-text);
    background: #fff;
}
.btn-ghost:hover { border-color: var(--color-primary); }
.btn-lg { padding: 12px 20px; font-size: 1.02rem; }

.badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    background: var(--color-bg-gray);
    color: var(--color-primary);
    font-weight: 700;
}
.badge-outline {
    background: transparent;
    border: 1px solid var(--color-border);
    color: var(--color-text);
}
.badge-sm {
    display: inline-block;
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    background: var(--color-bg-gray);
    font-size: 0.85rem;
}

.hero {
    background: #fff;
    border-bottom: 1px solid var(--color-border);
}
.hero-split .container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 32px;
    align-items: center;
    padding: 36px 0;
}
.hero-title {
    font-size: clamp(2.4rem, 4vw, 3.6rem);
    line-height: 1.1;
    margin: 12px 0;
    font-family: var(--font-heading);
}
.hero-desc { color: var(--color-muted); max-width: 620px; }
.hero-actions { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; margin: 16px 0; }
.hero-visual { position: relative; }
.hero-visual img { border-radius: var(--radius-md); border: 1px solid var(--color-border); box-shadow: var(--shadow-soft); }
.visual-caption {
    position: absolute;
    bottom: 12px;
    left: 12px;
    background: rgba(255, 255, 255, 0.92);
    border: 1px solid var(--color-border);
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
}
.hero-badge-row { display: flex; gap: 10px; flex-wrap: wrap; }
.stats-inline { display: flex; flex-wrap: wrap; gap: 18px; margin-top: 16px; }
.stat {
    min-width: 120px;
    padding: 12px 14px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-bg-gray);
}
.stat strong { display: block; font-size: 1.6rem; color: var(--color-primary); }
.stat span { color: var(--color-muted); }
.hero-highlights {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 12px;
    margin-top: 14px;
}
.hero-highlights .highlight {
    padding: 12px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: #fff;
    box-shadow: var(--shadow-soft);
}
.hero-highlights .highlight strong { display: block; color: var(--color-primary); margin-bottom: 4px; }
.hero-highlights .highlight p { color: var(--color-muted); margin: 0; }
.contact-inline {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
    margin-top: 12px;
}
.contact-chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 12px;
    border: 1px dashed var(--color-border);
    border-radius: var(--radius-sm);
    background: #fff;
    color: var(--color-text);
    font-weight: 600;
}
.contact-chip:hover { border-color: var(--color-primary); color: var(--color-primary); }
.response-note { color: var(--color-muted); font-size: 0.95rem; }

.section {
    padding: 72px 0;
    position: relative;
}
.section.bg-light { background: var(--color-bg-gray); }
.section-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 24px;
}
.section-header h2 {
    font-size: clamp(1.9rem, 3vw, 2.6rem);
    color: var(--color-text);
}
.section-header p { color: var(--color-muted); max-width: 720px; }
.section-header-center { flex-direction: column; align-items: center; text-align: center; }

.matrix-table {
    border: 1px solid var(--color-border);
    border-radius: 0;
    overflow: hidden;
    background: #fff;
}
.matrix-table table { width: 100%; border-collapse: collapse; }
.matrix-table th,
.matrix-table td {
    padding: 14px 16px;
    border-bottom: 1px solid var(--color-border);
    text-align: left;
}
.matrix-table th {
    background: var(--color-primary);
    color: #fff;
    letter-spacing: 0.06em;
}
.matrix-table tbody tr:hover { background: var(--color-bg-gray); }

.two-column {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
    align-items: center;
}
.feature-list { list-style: none; display: grid; gap: 12px; color: var(--color-muted); }
.feature-list strong { color: var(--color-primary); }

.industry-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
}
.industry-card {
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 16px;
    text-align: center;
}
.industry-card h4 { margin: 10px 0 6px; }
.industry-card p { color: var(--color-muted); }

.cta-section { background: #fff; }
.cta-box {
    border: 1px solid var(--color-border);
    border-radius: 0;
    padding: 20px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 12px;
    align-items: center;
    background: var(--color-bg-gray);
}
.cta-actions { display: flex; gap: 10px; flex-wrap: wrap; justify-content: flex-end; }

.doc-shell {
    display: grid;
    grid-template-columns: 220px 1fr;
    gap: 0;
    align-items: start;
    padding: 0;
    max-width: var(--max-width);
    margin: 0 auto;
    background: var(--color-bg);
    border-left: 1px solid var(--color-border);
    border-right: 1px solid var(--color-border);
}
.doc-nav {
    position: sticky;
    top: calc(var(--header-height) + 12px);
    height: fit-content;
    background: var(--color-bg);
    border-right: 1px solid var(--color-border);
    border-radius: 0;
    padding: 24px 18px;
    display: grid;
    gap: 8px;
}
.doc-nav h5 { margin-bottom: 8px; color: var(--color-primary); }
.doc-nav a {
    display: block;
    padding: 6px 8px;
    border-radius: var(--radius-sm);
    color: var(--color-text);
    border: none;
}
.doc-nav a:hover,
.doc-nav a.active { background: var(--color-bg-gray); }
.doc-main { display: grid; gap: 32px; padding: 24px; }
.doc-main .container {
    width: 100%;
    margin: 0;
}

.card {
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 16px;
    box-shadow: none;
}
.card h3 { margin-bottom: 8px; }
.card p { color: var(--color-muted); }
.grid { display: grid; gap: 16px; }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }

.stat-block {
    padding: 16px;
    border: 1px dashed var(--color-border);
    border-radius: var(--radius-sm);
    background: #fff;
}
.stat-block strong { font-size: 1.4rem; color: var(--color-primary); }
.stat-block span { display: block; color: var(--color-muted); }

.table {
    width: 100%;
    border-collapse: collapse;
    background: #fff;
}
.table th,
.table td {
    padding: 12px 14px;
    border: 1px solid var(--color-border);
    text-align: left;
}
.table th {
    background: var(--color-primary);
    font-weight: 500;
    color: #fff;
    letter-spacing: 0.04em;
}
.table-scroll { overflow-x: auto; }

.list-inline { display: flex; gap: 8px; flex-wrap: wrap; }
.tag {
    display: inline-flex;
    align-items: center;
    padding: 6px 10px;
    border-radius: var(--radius-sm);
    background: var(--color-bg-gray);
    color: var(--color-primary);
    font-weight: 600;
}

.quote-box {
    border-left: 3px solid var(--color-primary);
    padding-left: 14px;
    color: var(--color-muted);
}

/* 产品检索/筛选面板（CAS号检索） */
.filter-panel {
    border: 1px solid var(--color-border);
    background: var(--color-bg-gray);
    padding: 14px;
}
.filter-actions {
    margin-top: 10px;
    display: flex;
    gap: 8px;
    justify-content: flex-end;
    flex-wrap: wrap;
}

/* 配方推荐工具布局 */
.tool-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 16px;
    align-items: start;
}

.download-list { display: grid; gap: 12px; }
.download-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 12px 14px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: #fff;
}

.news-list { display: grid; gap: 12px; }
.news-card {
    padding: 12px 14px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: #fff;
}
.news-card time { color: var(--color-muted); font-size: 0.95rem; }
.news-card h4 { margin: 6px 0; }

.case-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 14px;
}
.case-card {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: #fff;
    overflow: hidden;
}
.case-card img { width: 100%; height: 160px; object-fit: cover; }
.case-card .case-body { padding: 12px 14px; }
.case-card .tags { color: var(--color-muted); font-size: 0.95rem; }

.form-grid { display: grid; gap: 12px; }
.form-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 12px; }
.form-group { display: flex; flex-direction: column; gap: 6px; }
label { font-weight: 700; color: var(--color-text); }
input, select, textarea {
    padding: 12px 10px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
    background: #fff;
    font-family: inherit;
    font-size: 1rem;
}
textarea { resize: vertical; min-height: 160px; }

.page-hero {
    background: transparent;
    border-bottom: none;
    padding: 28px 0 18px;
}
.page-hero .container {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    padding: 18px 20px;
}
.breadcrumb {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 10px;
    border-radius: var(--radius-sm);
    background: var(--color-bg-gray);
    color: var(--color-muted);
    font-size: 0.95rem;
}
.page-hero h1 { margin: 12px 0 6px; font-size: clamp(2rem, 3vw, 2.6rem); }
.page-hero p { color: var(--color-muted); max-width: 780px; }

.footer {
    background: var(--color-bg-gray);
    border-top: 1px solid var(--color-border);
    margin-top: 48px;
    padding: 36px 0 18px;
    color: var(--color-text);
}
.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
}
.footer h5 { margin-bottom: 8px; color: var(--color-primary); }
.footer ul { list-style: none; display: grid; gap: 6px; }
.footer a { color: var(--color-text); }
.footer-bottom {
    margin-top: 20px;
    padding-top: 12px;
    border-top: 1px solid var(--color-border);
    font-size: 0.95rem;
    color: var(--color-muted);
    text-align: center;
}

@media (max-width: 1024px) {
    :root { --header-height: 70px; }
    .nav-main {
        position: absolute;
        top: var(--header-height);
        left: 0;
        right: 0;
        background: #fff;
        border-bottom: 1px solid var(--color-border);
        padding: 12px 0;
        display: none;
    }
    .nav-main ul {
        flex-direction: column;
        align-items: flex-start;
        gap: 4px;
        padding: 0 20px;
    }
    .nav-main.open { display: block; }
    .nav-actions { display: none; }
    .nav-toggle { display: inline-flex; align-items: center; justify-content: center; }
    .dropdown-panel {
        position: static;
        box-shadow: none;
        border: 1px solid var(--color-border);
        margin-top: 8px;
    }
    .doc-shell { grid-template-columns: 1fr; }
    .doc-nav {
        position: static;
        border-right: none;
        border-bottom: 1px solid var(--color-border);
        padding: 12px 0;
        background: var(--color-bg);
    }
    .doc-main { padding: 12px 0; }
}

@media (max-width: 640px) {
    .container { width: calc(100% - 32px); }
    .hero-actions { width: 100%; }
    .cta-actions { justify-content: flex-start; }
}