/* =====================================================
   兰小集品牌官网 - 前端样式
   设计方向：东方草本美学，温润内敛
   ===================================================== */

/* === Reset & Base === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --color-primary: #4a7c59;
    --color-primary-dark: #3a6347;
    --color-primary-light: #e8f0ea;
    --color-accent: #c4a35a;
    --color-accent-light: #f5edda;
    --color-text: #2c2c2c;
    --color-text-secondary: #666;
    --color-text-muted: #999;
    --color-bg: #ffffff;
    --color-bg-alt: #f8f7f5;
    --color-bg-dark: #2c2c2c;
    --color-border: #e5e5e5;
    --color-success: #4a7c59;
    --color-error: #c0392b;
    --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
    --font-serif: "Noto Serif SC", "Source Han Serif SC", "STSong", serif;
    --max-width: 1200px;
    --header-height: 72px;
    --radius: 8px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
    --transition: 0.3s ease;
}

html { font-size: 16px; scroll-behavior: smooth; }

body {
    font-family: var(--font-sans);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

a { color: var(--color-primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-primary-dark); }

img { max-width: 100%; height: auto; display: block; }

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

.text-center { text-align: center; }
.text-muted { color: var(--color-text-muted); }

/* === Buttons === */
.btn {
    display: inline-block;
    padding: 10px 24px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
    text-align: center;
    line-height: 1.5;
    background: var(--color-bg);
    color: var(--color-text);
}
.btn:hover { border-color: var(--color-primary); color: var(--color-primary); }
.btn-primary { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }
.btn-primary:hover { background: var(--color-primary-dark); color: #fff; }
.btn-outline { background: transparent; border-color: var(--color-primary); color: var(--color-primary); }
.btn-outline:hover { background: var(--color-primary); color: #fff; }
.btn-lg { padding: 14px 36px; font-size: 16px; }
.btn-sm { padding: 6px 14px; font-size: 13px; }

/* === Header === */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    height: var(--header-height);
}
.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
}
.site-logo {
    font-family: var(--font-serif);
    font-size: 24px;
    font-weight: 700;
    color: var(--color-primary);
    letter-spacing: 2px;
}
.logo-text { display: inline-block; }
.main-nav { display: flex; align-items: center; }
.nav-toggle { display: none; background: none; border: none; font-size: 24px; cursor: pointer; color: var(--color-text); }
.nav-list {
    display: flex;
    list-style: none;
    gap: 8px;
}
.nav-list li a {
    display: block;
    padding: 8px 16px;
    font-size: 15px;
    color: var(--color-text);
    border-radius: var(--radius);
    transition: all var(--transition);
}
.nav-list li a:hover,
.nav-list li a.active {
    color: var(--color-primary);
    background: var(--color-primary-light);
}

/* === Hero === */
.hero {
    background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-accent-light) 100%);
    padding: 80px 0;
    text-align: center;
}
.hero-inner { max-width: 800px; margin: 0 auto; }
.hero h1 {
    font-family: var(--font-serif);
    font-size: 40px;
    font-weight: 700;
    color: var(--color-primary-dark);
    margin-bottom: 16px;
    line-height: 1.3;
}
.hero-subtitle {
    font-size: 20px;
    color: var(--color-accent);
    margin-bottom: 16px;
    font-weight: 500;
    letter-spacing: 4px;
}
.hero-desc {
    font-size: 16px;
    color: var(--color-text-secondary);
    margin-bottom: 32px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* === Sections === */
.section { padding: 64px 0; }
.section:nth-child(even) { background: var(--color-bg-alt); }
.section-title {
    font-family: var(--font-serif);
    font-size: 32px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 12px;
    color: var(--color-text);
}
.section-subtitle {
    text-align: center;
    color: var(--color-text-secondary);
    font-size: 16px;
    margin-bottom: 48px;
}
.section-action { text-align: center; margin-top: 40px; }

/* === Advantage Grid === */
.advantage-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}
.advantage-card {
    background: var(--color-bg);
    border-radius: var(--radius);
    padding: 32px 24px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition);
}
.advantage-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.advantage-icon { font-size: 40px; margin-bottom: 16px; }
.advantage-card h3 { font-size: 18px; margin-bottom: 12px; color: var(--color-primary-dark); }
.advantage-card p { font-size: 14px; color: var(--color-text-secondary); line-height: 1.7; }

/* === Product Grid === */
.product-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
    max-width: 800px;
    margin: 0 auto;
}
.product-card {
    background: var(--color-bg);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition);
}
.product-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.product-image { aspect-ratio: 1; background: var(--color-bg-alt); overflow: hidden; }
.product-image img { width: 100%; height: 100%; object-fit: cover; }
.product-placeholder { display: flex; align-items: center; justify-content: center; height: 100%; }
.product-placeholder svg { width: 100%; height: 100%; }
.product-info { padding: 24px; }
.product-info h3 { font-size: 18px; margin-bottom: 8px; }
.product-spec { font-size: 13px; color: var(--color-text-muted); margin-bottom: 8px; }
.product-efficacy { font-size: 14px; color: var(--color-text-secondary); margin-bottom: 12px; }
.product-price { font-size: 24px; font-weight: 700; color: var(--color-accent); margin-bottom: 16px; }

/* Product list full */
.product-list-full { display: flex; flex-direction: column; gap: 48px; }
.product-card-full {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
}
.product-image-large { aspect-ratio: 1; background: var(--color-bg-alt); border-radius: var(--radius); overflow: hidden; }
.product-image-large img { width: 100%; height: 100%; object-fit: cover; }
.product-placeholder-large { display: flex; align-items: center; justify-content: center; height: 100%; }
.product-detail-info h2 { font-family: var(--font-serif); font-size: 28px; margin-bottom: 12px; }
.product-meta-row { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 16px; }
.product-spec-tag, .product-cert-tag {
    display: inline-block;
    padding: 4px 12px;
    background: var(--color-primary-light);
    border-radius: 20px;
    font-size: 13px;
    color: var(--color-primary-dark);
}
.product-cert-tag { background: var(--color-accent-light); color: #8a6d2b; }
.product-price-large { font-size: 32px; font-weight: 700; color: var(--color-accent); margin-bottom: 16px; }
.product-desc { font-size: 15px; color: var(--color-text-secondary); margin-bottom: 24px; line-height: 1.7; }

/* Product detail */
.product-detail {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
}
.product-gallery { position: sticky; top: calc(var(--header-height) + 24px); }
.product-main-image { border-radius: var(--radius); }
.product-main-info h1 { font-family: var(--font-serif); font-size: 32px; margin-bottom: 16px; }
.product-price-big { font-size: 36px; font-weight: 700; color: var(--color-accent); margin-bottom: 20px; }
.product-tags-row { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 24px; }
.tag-badge {
    display: inline-block;
    padding: 4px 12px;
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: 20px;
    font-size: 13px;
    color: var(--color-text-secondary);
}
.tag-cert { background: var(--color-accent-light); border-color: var(--color-accent); color: #8a6d2b; }
.product-section { margin-bottom: 24px; padding-bottom: 24px; border-bottom: 1px solid var(--color-border); }
.product-section h2 { font-size: 18px; color: var(--color-primary-dark); margin-bottom: 12px; }
.product-section p { font-size: 15px; color: var(--color-text-secondary); line-height: 1.8; }

/* === Brand Strength === */
.strength-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}
.strength-item {
    padding: 24px;
    background: var(--color-bg);
    border-radius: var(--radius);
    border-left: 3px solid var(--color-primary);
}
.strength-item h3 { font-size: 16px; color: var(--color-primary-dark); margin-bottom: 8px; }
.strength-item p { font-size: 14px; color: var(--color-text-secondary); line-height: 1.7; }

/* === Brand Page === */
.brand-story h1 { font-family: var(--font-serif); font-size: 36px; text-align: center; margin-bottom: 24px; }
.brand-content { max-width: 800px; margin: 0 auto; font-size: 16px; line-height: 1.9; color: var(--color-text-secondary); }
.philosophy-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.philosophy-card {
    padding: 32px;
    background: var(--color-bg);
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
}
.philosophy-card h3 { color: var(--color-primary-dark); margin-bottom: 12px; font-size: 20px; }
.philosophy-card p { color: var(--color-text-secondary); line-height: 1.7; }
.credentials-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.credential-item {
    padding: 24px;
    background: var(--color-bg);
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
}
.credential-item h3 { color: var(--color-primary-dark); margin-bottom: 12px; }
.credential-item p, .credential-item li { color: var(--color-text-secondary); line-height: 1.7; }
.credential-item ul { padding-left: 20px; margin-top: 8px; }
.rd-content { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
.rd-highlight { padding: 32px; background: var(--color-primary-light); border-radius: var(--radius); }
.rd-highlight h3 { color: var(--color-primary-dark); margin-bottom: 12px; }
.rd-highlight p { color: var(--color-text-secondary); margin-bottom: 12px; }
.rd-highlight ul { padding-left: 20px; }
.rd-highlight li { color: var(--color-text-secondary); margin-bottom: 6px; }
.rd-stats { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.stat-item {
    text-align: center;
    padding: 24px 16px;
    background: var(--color-bg);
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
}
.stat-number { display: block; font-size: 28px; font-weight: 700; color: var(--color-primary); }
.stat-label { font-size: 13px; color: var(--color-text-muted); }
.qc-steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.qc-step { text-align: center; padding: 24px; }
.step-num { display: block; font-size: 36px; font-weight: 700; color: var(--color-primary-light); margin-bottom: 12px; }
.qc-step h3 { font-size: 16px; margin-bottom: 8px; color: var(--color-primary-dark); }
.qc-step p { font-size: 14px; color: var(--color-text-secondary); }

/* === Articles === */
.article-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.article-card {
    padding: 24px;
    background: var(--color-bg);
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
    transition: all var(--transition);
}
.article-card:hover { box-shadow: var(--shadow-md); }
.article-card h3 { font-size: 16px; margin-bottom: 8px; }
.article-card h3 a { color: var(--color-text); }
.article-card h3 a:hover { color: var(--color-primary); }
.article-meta { font-size: 13px; color: var(--color-text-muted); margin-bottom: 8px; }
.article-excerpt { font-size: 14px; color: var(--color-text-secondary); }

/* Article list page */
.category-filter { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 32px; }
.filter-tag {
    padding: 6px 16px;
    border: 1px solid var(--color-border);
    border-radius: 20px;
    font-size: 14px;
    color: var(--color-text-secondary);
    transition: all var(--transition);
}
.filter-tag:hover, .filter-tag.active { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }

.article-list { display: flex; flex-direction: column; gap: 24px; }
.article-list-item {
    display: flex;
    gap: 24px;
    padding: 24px;
    background: var(--color-bg);
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
    transition: all var(--transition);
}
.article-list-item:hover { box-shadow: var(--shadow-md); }
.article-list-content { flex: 1; }
.article-list-content h2 { font-size: 20px; margin-bottom: 8px; }
.article-list-content h2 a { color: var(--color-text); }
.article-list-content h2 a:hover { color: var(--color-primary); }
.article-summary { font-size: 14px; color: var(--color-text-secondary); margin-top: 8px; }
.article-list-thumb { width: 180px; flex-shrink: 0; }
.article-list-thumb img { width: 100%; height: 120px; object-fit: cover; border-radius: var(--radius); }

/* Article detail */
.article-detail-page h1 { font-family: var(--font-serif); font-size: 32px; margin-bottom: 16px; }
.article-header { margin-bottom: 32px; padding-bottom: 24px; border-bottom: 1px solid var(--color-border); }
.article-update { font-size: 13px; color: var(--color-text-muted); margin-top: 8px; }
.article-cover { margin-bottom: 32px; }
.article-cover img { border-radius: var(--radius); max-height: 400px; width: 100%; object-fit: cover; }
.article-body {
    font-size: 16px;
    line-height: 1.9;
    color: var(--color-text);
    max-width: 800px;
    margin: 0 auto 48px;
}
.article-body p { margin-bottom: 16px; }
.article-body h2 { font-size: 22px; margin: 32px 0 16px; }
.article-body h3 { font-size: 18px; margin: 24px 0 12px; }
.article-body img { border-radius: var(--radius); margin: 16px 0; }
.article-body ul, .article-body ol { padding-left: 24px; margin-bottom: 16px; }
.article-body table { width: 100%; border-collapse: collapse; margin: 16px 0; }
.article-body td, .article-body th { padding: 8px 12px; border: 1px solid var(--color-border); }

.article-tags { display: inline-flex; gap: 6px; }
.tag-badge-sm {
    display: inline-block;
    padding: 2px 8px;
    background: var(--color-primary-light);
    border-radius: 10px;
    font-size: 12px;
    color: var(--color-primary-dark);
}

.article-footer { margin-top: 48px; padding-top: 24px; border-top: 1px solid var(--color-border); }
.article-nav { display: flex; justify-content: space-between; gap: 16px; }
.article-nav-link {
    padding: 12px 20px;
    background: var(--color-bg-alt);
    border-radius: var(--radius);
    font-size: 14px;
    color: var(--color-text);
    max-width: 45%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.article-nav-link:hover { background: var(--color-primary-light); color: var(--color-primary); }

.related-articles { margin-top: 48px; }
.related-articles h2 { font-size: 22px; margin-bottom: 24px; }
.related-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.related-card {
    padding: 16px;
    background: var(--color-bg-alt);
    border-radius: var(--radius);
}
.related-card h3 { font-size: 15px; margin-bottom: 6px; }
.related-card h3 a { color: var(--color-text); }
.related-card h3 a:hover { color: var(--color-primary); }
.related-card p { font-size: 13px; color: var(--color-text-muted); margin-bottom: 4px; }
.related-card time { font-size: 12px; color: var(--color-text-muted); }

/* === FAQ === */
.faq-list, .faq-full-list { max-width: 800px; margin: 0 auto; }
.faq-item, .faq-full-item {
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    margin-bottom: 12px;
    overflow: hidden;
}
.faq-item summary, .faq-full-item summary {
    padding: 16px 20px;
    cursor: pointer;
    font-weight: 500;
    font-size: 16px;
    list-style: none;
    display: flex;
    align-items: center;
    gap: 12px;
    transition: background var(--transition);
}
.faq-item summary:hover, .faq-full-item summary:hover { background: var(--color-bg-alt); }
.faq-item summary::marker, .faq-full-item summary::marker { display: none; }
.faq-q-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: var(--color-primary);
    color: #fff;
    border-radius: 50%;
    font-size: 14px;
    font-weight: 700;
    flex-shrink: 0;
}
.faq-answer, .faq-full-answer {
    padding: 0 20px 16px 60px;
    font-size: 15px;
    color: var(--color-text-secondary);
    line-height: 1.7;
}
.faq-a-icon { display: none; }

/* === Contact === */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; margin-bottom: 32px; }
.contact-card {
    padding: 32px;
    background: var(--color-bg);
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
}
.contact-card h2 { font-size: 20px; margin-bottom: 20px; color: var(--color-primary-dark); }
.contact-info-list { list-style: none; }
.contact-info-list li { display: flex; justify-content: space-between; padding: 10px 0; border-bottom: 1px solid var(--color-border); }
.contact-label { color: var(--color-text-muted); font-size: 14px; }
.contact-value { font-weight: 500; }
.channel-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; margin-top: 16px; }
.channel-item {
    padding: 16px;
    background: var(--color-bg-alt);
    border-radius: var(--radius);
    text-align: center;
}
.channel-item h3 { font-size: 16px; color: var(--color-primary-dark); margin-bottom: 4px; }
.channel-item p { font-size: 13px; color: var(--color-text-muted); }
.contact-cert { margin-top: 0; }
.contact-cert ul { padding-left: 20px; margin: 12px 0; }
.contact-cert li { margin-bottom: 6px; }

/* === Breadcrumb === */
.breadcrumb {
    background: var(--color-bg-alt);
    padding: 12px 0;
    font-size: 14px;
    color: var(--color-text-muted);
}
.breadcrumb a { color: var(--color-text-secondary); }
.breadcrumb a:hover { color: var(--color-primary); }

/* === Pagination === */
.pagination {
    display: flex;
    justify-content: center;
    gap: 4px;
    margin-top: 32px;
}
.page-link {
    display: inline-block;
    padding: 8px 14px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 14px;
    color: var(--color-text-secondary);
    transition: all var(--transition);
}
.page-link:hover, .page-link.active { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }

/* === Footer === */
.site-footer {
    background: var(--color-bg-dark);
    color: #ccc;
    padding: 48px 0 24px;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 32px;
    margin-bottom: 32px;
}
.footer-brand h3 { font-family: var(--font-serif); font-size: 24px; color: #fff; margin-bottom: 8px; }
.footer-brand p { font-size: 14px; color: #999; }
.footer-links h4, .footer-contact h4, .footer-channels h4 { font-size: 15px; color: #fff; margin-bottom: 12px; }
.footer-links ul { list-style: none; }
.footer-links li { margin-bottom: 6px; }
.footer-links a { color: #999; font-size: 14px; }
.footer-links a:hover { color: #fff; }
.footer-contact p, .footer-channels li { font-size: 14px; color: #999; margin-bottom: 4px; }
.footer-channels ul { list-style: none; }
.footer-bottom {
    border-top: 1px solid #444;
    padding-top: 16px;
    text-align: center;
    font-size: 13px;
    color: #666;
}

/* === Error Page === */
.error-page { padding: 120px 0; }
.error-page h1 { font-size: 80px; color: var(--color-primary-light); margin-bottom: 16px; }
.error-message { font-size: 18px; color: var(--color-text-secondary); margin-bottom: 32px; }
.error-actions { display: flex; gap: 12px; justify-content: center; }

/* === Responsive === */
@media (max-width: 1024px) {
    .advantage-grid { grid-template-columns: repeat(2, 1fr); }
    .strength-grid { grid-template-columns: repeat(2, 1fr); }
    .article-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: repeat(2, 1fr); }
    .qc-steps { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .hero h1 { font-size: 28px; }
    .hero-subtitle { font-size: 16px; letter-spacing: 2px; }
    .section { padding: 40px 0; }
    .section-title { font-size: 24px; }
    .advantage-grid { grid-template-columns: 1fr; }
    .product-grid { grid-template-columns: 1fr; }
    .product-card-full { grid-template-columns: 1fr; }
    .product-detail { grid-template-columns: 1fr; }
    .product-gallery { position: static; }
    .article-grid { grid-template-columns: 1fr; }
    .article-list-item { flex-direction: column; }
    .article-list-thumb { width: 100%; }
    .philosophy-grid { grid-template-columns: 1fr; }
    .credentials-grid { grid-template-columns: 1fr; }
    .rd-content { grid-template-columns: 1fr; }
    .contact-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
    .strength-grid { grid-template-columns: 1fr; }
    .qc-steps { grid-template-columns: 1fr; }
    .related-grid { grid-template-columns: 1fr; }

    .nav-toggle { display: block; }
    .nav-list {
        display: none;
        position: absolute;
        top: var(--header-height);
        left: 0;
        right: 0;
        background: var(--color-bg);
        flex-direction: column;
        padding: 16px;
        border-bottom: 1px solid var(--color-border);
        box-shadow: var(--shadow-md);
    }
    .nav-list.open { display: flex; }
}