/* ==========================================================================
   YANSYUAN 锯切类产品 B2B 官网 · 共用样式
   响应式三档断点：桌面 ≥1024px ／ 平板 768–1023px ／ 手机 <768px
   图片一律占位（CSS 占位块 / 内联 SVG），不引入任何未核实的产品图或 Logo 图片
   ========================================================================== */

:root {
  --c-bg: #ffffff;
  --c-surface: #f6f8fa;
  --c-text: #1b1f24;
  --c-muted: #5b6570;
  --c-line: #e3e7eb;
  --c-primary: #14487a;
  --c-primary-dark: #0e3559;
  --c-accent: #d2601a;
  --c-tbc: #8a6d1f;
  --radius: 6px;
  --wrap: 1200px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
    Arial, "Noto Sans", "Noto Sans SC", sans-serif;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.65;
  color: var(--c-text);
  background: var(--c-bg);
}

img, svg { max-width: 100%; }

a { color: var(--c-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3 { line-height: 1.3; margin: 0 0 .5em; }
h1 { font-size: 2rem; }
h2 { font-size: 1.35rem; margin-top: 1.6em; }
h3 { font-size: 1.08rem; }

p { margin: 0 0 1em; }

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 20px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--c-primary);
  color: #fff;
  padding: 8px 16px;
  z-index: 100;
}
.skip-link:focus { left: 8px; top: 8px; }

/* ------------------------------------------------------------------ 顶栏 */

.site-header {
  border-bottom: 1px solid var(--c-line);
  position: sticky;
  top: 0;
  background: #fff;
  z-index: 50;
}

.utility-bar {
  background: var(--c-surface);
  border-bottom: 1px solid var(--c-line);
  font-size: .85rem;
}
.utility-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 38px;
}
.utility-nav { display: flex; gap: 18px; }
.utility-nav a { color: var(--c-muted); }
.utility-right { display: flex; align-items: center; gap: 16px; }

.wa-placeholder {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--c-muted);
}
.wa-value { color: var(--c-text); font-weight: 600; }

.icon { width: 18px; height: 18px; display: inline-block; vertical-align: -3px; }

/* 语言切换 */
.lang-switch { position: relative; }
.lang-toggle {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: none;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 3px 8px;
  font: inherit;
  font-size: .85rem;
  color: var(--c-text);
  cursor: pointer;
}
.lang-list {
  display: none;
  position: absolute;
  right: 0;
  top: calc(100% + 4px);
  min-width: 150px;
  margin: 0;
  padding: 6px;
  list-style: none;
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  box-shadow: 0 6px 18px rgba(0, 0, 0, .08);
  z-index: 60;
}
.lang-switch.is-open .lang-list { display: block; }
.lang-list a { display: block; padding: 6px 10px; color: var(--c-text); }
.lang-list a.is-current { font-weight: 700; color: var(--c-primary); }
.lang-list a:hover { background: var(--c-surface); text-decoration: none; }

/* 主导航 */
.nav-inner {
  display: flex;
  align-items: center;
  gap: 20px;
  min-height: 62px;
}
.logo {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--c-text);
  font-weight: 700;
  letter-spacing: .04em;
  flex: 0 0 auto;
}
.logo:hover { text-decoration: none; }
.logo-mark { width: 30px; height: 30px; color: var(--c-primary); }
.logo-text { font-size: 1.05rem; }

.main-nav { flex: 1 1 auto; }
.main-nav > ul,
.main-nav ul {
  display: flex;
  gap: 4px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.nav-item { position: relative; }
.nav-link {
  display: block;
  padding: 10px 12px;
  color: var(--c-text);
  font-size: .95rem;
  white-space: nowrap;
}
.nav-link-static { color: var(--c-text); cursor: default; }
.nav-item:hover > .nav-link { color: var(--c-primary); }

.dropdown {
  display: none;
  position: absolute;
  left: 0;
  top: 100%;
  min-width: 230px;
  margin: 0;
  padding: 8px;
  list-style: none;
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  box-shadow: 0 8px 22px rgba(0, 0, 0, .08);
  z-index: 60;
  flex-direction: column;
  gap: 2px;
  max-height: 70vh;
  overflow-y: auto;
}
.nav-item.has-dropdown:hover > .dropdown,
.nav-item.has-dropdown.is-open > .dropdown { display: flex; }
.dropdown a { display: block; padding: 7px 10px; color: var(--c-text); font-size: .92rem; }
.dropdown a:hover { background: var(--c-surface); text-decoration: none; }
.dropdown-group { margin-bottom: 6px; }
.dropdown-group-link { font-weight: 700; color: var(--c-primary) !important; }
.dropdown-sub { margin: 2px 0 0; padding: 0 0 0 10px; list-style: none; }
.dropdown-sub a { padding: 5px 10px; font-size: .88rem; }

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 6px 8px;
  cursor: pointer;
}

/* ------------------------------------------------------------------ 按钮 */

.btn {
  display: inline-block;
  padding: 10px 18px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  font: inherit;
  font-weight: 600;
  text-align: center;
  cursor: pointer;
}
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--c-primary); color: #fff; }
.btn-primary:hover { background: var(--c-primary-dark); }
.btn-ghost { background: #fff; color: var(--c-primary); border-color: var(--c-primary); }
.btn-ghost:hover { background: var(--c-surface); }
.header-cta { flex: 0 0 auto; }

/* ------------------------------------------------------------------ 主体 */

main { padding: 24px 0 48px; }
main > * { margin-left: auto; margin-right: auto; }
main > h1, main > p, main > nav, main > section,
main > .breadcrumbs, main > .content-section {
  max-width: var(--wrap);
  padding-left: 20px;
  padding-right: 20px;
}
main > h1 { margin-top: 8px; }

.lead { font-size: 1.1rem; color: var(--c-muted); }

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 14px;
  padding: 0;
  list-style: none;
  font-size: .85rem;
  color: var(--c-muted);
}
.breadcrumbs li + li::before { content: "›"; margin-right: 8px; color: var(--c-line); }

/* 内容区块 */
.content-section { margin-bottom: 28px; }
.content-section ul { padding-left: 22px; }
.why-list { padding-left: 22px; }
.sub-h { margin-top: 1.4em; font-size: 1.05rem; }

.neutral-note,
.spec-note,
.filter-note,
.provisional-note {
  color: var(--c-tbc);
  font-size: .88rem;
  border-left: 3px solid var(--c-tbc);
  padding-left: 10px;
  background: #fdf9ef;
  padding: 8px 10px;
  border-radius: 0 var(--radius) var(--radius) 0;
}

/* CTA */
.hero-cta, .inline-cta, .bottom-cta, .thankyou-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  margin: 24px 0;
}
.bottom-cta {
  flex-direction: column;
  align-items: flex-start;
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 24px;
}
.bottom-cta h2 { margin-top: 0; }
.inline-cta { padding: 12px 0; }
.cta-note { flex: 1 1 240px; margin: 0; color: var(--c-muted); font-size: .9rem; }

/* 卡片网格 */
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin: 16px 0 24px;
}
.card-grid.grid-2 { grid-template-columns: repeat(2, 1fr); }
.card {
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 16px;
  background: #fff;
}
.card:hover { border-color: #c9d2da; }
.card-title { margin: 0 0 8px; font-size: 1.02rem; }
.card-title a { color: var(--c-text); }
.card-title a:hover { color: var(--c-primary); }
.card-desc { color: var(--c-muted); font-size: .92rem; margin: 0 0 10px; }
.card-badge {
  display: inline-block;
  margin-left: 8px;
  padding: 1px 8px;
  font-size: .72rem;
  font-weight: 600;
  border-radius: 999px;
  background: var(--c-primary);
  color: #fff;
  vertical-align: 2px;
}
.card-sublist { margin: 10px 0 0; padding-left: 18px; font-size: .88rem; }
.card-sublist li { margin-bottom: 3px; }

/* 标签 */
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 16px;
  padding: 0;
  list-style: none;
}
.tag {
  display: inline-block;
  padding: 4px 12px;
  border: 1px solid var(--c-line);
  border-radius: 999px;
  font-size: .86rem;
  color: var(--c-text);
  background: #fff;
}
a.tag:hover { border-color: var(--c-primary); text-decoration: none; }
.tags-empty { color: var(--c-muted); font-size: .9rem; }
.brand-chips { margin-top: 12px; }

/* 规格参数表 */
.spec-block { margin: 24px 0; }
.table-wrap { overflow-x: auto; border: 1px solid var(--c-line); border-radius: var(--radius); }
.spec-table { width: 100%; border-collapse: collapse; font-size: .93rem; }
.spec-table th, .spec-table td {
  border-bottom: 1px solid var(--c-line);
  padding: 10px 14px;
  text-align: left;
  vertical-align: top;
}
.spec-table thead th { background: var(--c-surface); }
.spec-table tbody th { width: 34%; font-weight: 600; }
.spec-table td.tbc { color: var(--c-tbc); font-style: italic; }
.col-diagram { width: 130px; text-align: center !important; }
.diagram-wrap { display: inline-block; width: 120px; color: #9aa5b1; }
.diagram-ph { width: 120px; height: 60px; }

/* 筛选器 */
.filter-block { margin: 24px 0; }
.filter-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: flex-end;
  margin-bottom: 12px;
}
.filter-controls label { display: flex; flex-direction: column; gap: 4px; font-size: .88rem; }
.filter-controls select {
  font: inherit;
  padding: 8px 10px;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  min-width: 190px;
  background: #fff;
}
.filter-count { color: var(--c-muted); font-size: .88rem; margin: 0 0 8px; }
.filter-empty { color: var(--c-tbc); }
.filter-miss { margin-top: 12px; }
.filter-item.is-hidden { display: none; }

/* 相关内链 */
.related-block { margin: 32px 0; }
.related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.related-h { font-size: 1rem; margin-top: 0; }
.related-list { margin: 0; padding-left: 18px; font-size: .92rem; }
.related-list li { margin-bottom: 5px; }

/* 表单 */
.inquiry-form-block { margin: 24px 0; }
.inquiry-form {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  max-width: 760px;
}
.field { display: flex; flex-direction: column; gap: 5px; }
.field label { font-size: .9rem; font-weight: 600; }
.field .req { color: var(--c-accent); }
.field .opt { font-weight: 400; color: var(--c-muted); font-size: .82rem; }
.field input[type="text"],
.field input[type="email"],
.field select,
.field textarea {
  font: inherit;
  padding: 9px 11px;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  width: 100%;
  background: #fff;
}
.field textarea { resize: vertical; }
.hint { margin: 0; font-size: .8rem; color: var(--c-muted); }
.field-consent, .field-submit { grid-column: 1 / -1; }
.consent { display: flex; gap: 8px; align-items: flex-start; font-weight: 400 !important; font-size: .88rem; }
.consent input { margin-top: 5px; }
.form-notice {
  grid-column: 1 / -1;
  color: var(--c-tbc);
  background: #fdf9ef;
  border-left: 3px solid var(--c-tbc);
  padding: 10px 12px;
  border-radius: 0 var(--radius) var(--radius) 0;
}
.form-mailto { grid-column: 1 / -1; font-size: .9rem; }

/* 确认提示 / 修磨 */
.confirm-prompt, .resharpen-list, .applicable, .resharpen-related,
.brand-categories, .brand-fit, .alt-categories { margin: 24px 0; }
.confirm-list { padding-left: 22px; }
.alt-teaser { margin: 16px 0; }

/* ------------------------------------------------------------------ 页脚 */

.site-footer {
  border-top: 1px solid var(--c-line);
  background: var(--c-surface);
  padding: 32px 0 24px;
  font-size: .92rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1.2fr 1fr;
  gap: 28px;
}
.footer-h { font-size: .95rem; margin: 0 0 10px; }
.footer-list { margin: 0; padding: 0; list-style: none; }
.footer-list li { margin-bottom: 6px; }
.footer-contact .k { color: var(--c-muted); display: inline-block; min-width: 62px; }
.footer-contact .v { font-weight: 600; }
.footer-brand .logo { margin-bottom: 10px; }
.brand-statement, .brand-ownership, .copyright { font-size: .85rem; color: var(--c-muted); }
.footer-bottom {
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px solid var(--c-line);
  font-size: .85rem;
  color: var(--c-muted);
}
.sister-site .k { font-weight: 600; }
.tbc-note { margin: 8px 0 0; color: var(--c-tbc); }
.tbc-note .tbc-zh { font-family: var(--font); }

/* ------------------------------------------------------------------ 响应式 */

/* 平板 768–1023px */
@media (max-width: 1023px) {
  h1 { font-size: 1.7rem; }
  .card-grid { grid-template-columns: repeat(2, 1fr); }
  .card-grid.grid-3 { grid-template-columns: repeat(2, 1fr); }
  .related-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }

  .nav-toggle { display: inline-flex; }
  .main-nav {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    background: #fff;
    border-bottom: 1px solid var(--c-line);
    padding: 8px 20px 16px;
    max-height: 78vh;
    overflow-y: auto;
  }
  .site-header.nav-open .main-nav { display: block; }
  .main-nav > ul { flex-direction: column; gap: 0; }
  .nav-item { border-bottom: 1px solid var(--c-line); }
  .nav-link { padding: 12px 0; }
  .dropdown {
    position: static;
    display: none;
    box-shadow: none;
    border: 0;
    padding: 0 0 8px 8px;
    max-height: none;
  }
  .nav-item.has-dropdown.is-open > .dropdown { display: flex; }
  .header-cta { margin-left: auto; }
  .nav-inner { flex-wrap: wrap; }
}

/* 手机 <768px */
@media (max-width: 767px) {
  body { font-size: 15px; }
  h1 { font-size: 1.45rem; }
  .utility-inner { flex-wrap: wrap; gap: 8px; padding-top: 6px; padding-bottom: 6px; }
  .utility-nav { flex-wrap: wrap; gap: 12px; }
  .card-grid, .card-grid.grid-2, .card-grid.grid-3 { grid-template-columns: 1fr; }
  .related-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 20px; }
  .inquiry-form { grid-template-columns: 1fr; }
  .breadcrumbs ol { font-size: .8rem; }
  .filter-controls select { min-width: 100%; }
  .filter-controls { flex-direction: column; align-items: stretch; }
  .spec-table tbody th { width: 48%; }
  .bottom-cta { padding: 18px; }
}

/* ------------------------------------------------------------------ 方案 06 新增区块 */

/* ① 首屏引导型选择器（A4 / A5 总览入口；V15/V16 核实前不生成叶页链接） */
.hero-selector {
  margin: 24px 0 30px;
  padding: 22px;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  background: var(--c-surface);
}
.hero-selector > h2 { margin-top: 0; }
.selector-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.selector-card h3 { margin: 0 0 8px; }
.selector-card h3 a { color: var(--c-text); }
.selector-card h3 a:hover { color: var(--c-primary); }
.selector-card p { margin: 0; color: var(--c-muted); font-size: .93rem; }
.selector-note { margin: 16px 0 0; font-size: .93rem; }
.hero-selector .hero-cta { margin: 14px 0 0; }

/* ⑤ 品牌窄条：YANSYUAN 唯一主推 + 9 个合作品牌纯文字，无链接/无 Logo/无排名 */
.brand-strip, .brand-attached {
  margin: 26px 0;
  padding: 16px 18px;
  border-top: 1px solid var(--c-line);
  border-bottom: 1px solid var(--c-line);
  font-size: .92rem;
}
.brand-strip > h2, .brand-attached > h2 { margin: 0 0 8px; font-size: 1.1rem; }
.brand-strip p, .brand-attached p { margin: 0 0 8px; }
.partner-heading { color: var(--c-muted); font-size: .85rem; margin-top: 12px !important; }
.partner-names { display: flex; flex-wrap: wrap; gap: 8px 18px; margin: 6px 0 10px; }
.partner-name { color: var(--c-text); font-size: .88rem; letter-spacing: .02em; }

/* 品牌总览主分区 / 附带分区、A6 与 D1 的内链区 */
.brand-main, .brand-attached, .alt-intro-links, .brand-links { margin: 24px 0; }
.footer-h-sub { margin-top: 18px; }
.form-brand-note { color: var(--c-tbc); font-size: .9rem; margin: 0 0 14px; }

@media (max-width: 767px) {
  .selector-grid { grid-template-columns: 1fr; }
  .hero-selector { padding: 16px; }
  .partner-names { gap: 6px 12px; }
}

@media print {
  .site-header, .site-footer, .inline-cta, .hero-cta { display: none; }
}