/* ============================================================
   建沅网络 · 站点级共享样式
   设计语言：图纸灰白底 / 石墨深蓝 / 科技橙，等宽编号做信息索引
   ============================================================ */

:root {
  --bg: #f2f5f9;
  --bg-soft: #e8eef5;
  --card: #ffffff;
  --ink: #101b2d;
  --ink-2: #31415a;
  --ink-soft: #5f7288;
  --dark: #0b1424;
  --dark-2: #101d33;
  --orange: #ff5e00;
  --orange-2: #ff9040;
  --orange-soft: rgba(255, 94, 0, 0.08);
  --orange-line: rgba(255, 94, 0, 0.34);
  --blue: #1f5fd0;
  --ok: #0f8a5f;
  --danger: #c0392b;
  --line: #e2e8f0;
  --line-2: #cfd9e6;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 6px 22px rgba(16, 27, 45, 0.06);
  --shadow-hover: 0 16px 38px rgba(16, 27, 45, 0.12);
  --sans: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  font-family: var(--sans);
  color: var(--ink);
  background: var(--bg);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { font-family: inherit; }
section[id], article[id], div[id] { scroll-margin-top: 108px; }

.wrap { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ============ 焦点可见性 ============ */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ============ 顶部导航 ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(18px) saturate(1.08);
  -webkit-backdrop-filter: blur(18px) saturate(1.08);
  border-bottom: 1px solid rgba(16, 27, 45, 0.06);
}
.site-header::before {
  content: "";
  display: block;
  height: 3px;
  background: linear-gradient(90deg, var(--orange), var(--orange-2) 34%, rgba(255, 144, 64, 0) 66%);
}
.header-inner {
  display: flex;
  align-items: center;
  gap: 26px;
  min-height: 92px;
}

/* 品牌标识 */
.logo {
  display: flex;
  align-items: center;
  gap: 13px;
  flex-shrink: 0;
  padding: 6px 0;
}
.logo img {
  width: 46px;
  height: 46px;
  border-radius: 12px;
  box-shadow: 0 8px 18px rgba(16, 27, 45, 0.14);
  transition: transform 0.28s cubic-bezier(0.2, 0.7, 0.3, 1), box-shadow 0.28s;
}
.logo:hover img {
  transform: translateY(-2px) rotate(-2deg);
  box-shadow: 0 12px 24px rgba(16, 27, 45, 0.18);
}
.logo-text b {
  font-size: 21px;
  font-weight: 800;
  letter-spacing: 0.04em;
  line-height: 1.15;
  display: block;
}
.logo-text i {
  font-family: var(--mono);
  font-style: normal;
  font-size: 9.5px;
  letter-spacing: 0.26em;
  color: var(--orange);
  display: block;
  margin-top: 4px;
}
@media (min-width: 901px) {
  .logo::after {
    content: "";
    width: 1px;
    height: 30px;
    margin-left: 6px;
    background: linear-gradient(180deg, transparent, rgba(16, 27, 45, 0.16), transparent);
  }
}

/* 主导航 */
.main-nav {
  display: flex;
  align-items: center;
  gap: 5px;
  margin-left: auto;
  margin-right: auto;
}
.main-nav > a,
.nav-drop-wrap > .drop-toggle {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 11px 15px;
  font-size: 15.5px;
  font-weight: 500;
  letter-spacing: 0.01em;
  color: var(--ink-2);
  border-radius: 999px;
  white-space: nowrap;
  transition: color 0.2s, background 0.2s;
}
.main-nav > a::after,
.nav-drop-wrap > .drop-toggle::after {
  content: "";
  position: absolute;
  left: 15px;
  right: 15px;
  bottom: 5px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--orange), var(--orange-2));
  transform: scaleX(0);
  transform-origin: 50% 50%;
  transition: transform 0.26s cubic-bezier(0.2, 0.7, 0.3, 1);
}
.main-nav > a:hover,
.nav-drop-wrap > .drop-toggle:hover { color: var(--ink); background: rgba(255, 94, 0, 0.05); }
.main-nav > a:hover::after,
.nav-drop-wrap > .drop-toggle:hover::after,
.main-nav > a.on::after,
.nav-drop-wrap.on > .drop-toggle::after { transform: scaleX(1); }
.main-nav > a.on,
.nav-drop-wrap.on > .drop-toggle {
  color: var(--orange);
  font-weight: 600;
  background: transparent;
}
.nav-drop-wrap { position: relative; }
.nav-drop-wrap > .drop-toggle .caret {
  font-size: 10px;
  color: #a9b7c7;
  transition: transform 0.24s, color 0.2s;
}
.nav-drop-wrap:hover > .drop-toggle .caret,
.nav-drop-wrap:focus-within > .drop-toggle .caret,
.nav-drop-wrap.open > .drop-toggle .caret { transform: rotate(180deg); color: var(--orange); }

/* 下拉面板 */
.nav-drop {
  position: absolute;
  top: calc(100% + 24px);
  left: 50%;
  transform: translateX(-50%) translateY(8px) scale(0.99);
  min-width: 0;
  width: 700px;
  max-width: min(880px, 92vw);
  border: 1px solid rgba(16, 27, 45, 0.08);
  border-radius: 18px;
  background: #fff;
  box-shadow: 0 30px 70px rgba(16, 27, 45, 0.18);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s ease, transform 0.24s cubic-bezier(0.2, 0.7, 0.3, 1), visibility 0.2s;
  z-index: 99;
}
.nav-drop-wrap::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 100%;
  height: 26px;
}
.nav-drop::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  border-radius: 18px 18px 0 0;
  background: linear-gradient(90deg, var(--orange), var(--orange-2) 40%, rgba(255, 144, 64, 0) 86%);
}
.nav-drop-left { left: 0; transform: translateY(8px) scale(0.99); }
.nav-drop-right { left: auto; right: 0; transform: translateY(8px) scale(0.99); }
.nav-drop-wrap:hover .nav-drop,
.nav-drop-wrap:focus-within .nav-drop,
.nav-drop-wrap.open .nav-drop { opacity: 1; visibility: visible; }
.nav-drop-wrap:hover .nav-drop-left,
.nav-drop-wrap:focus-within .nav-drop-left,
.nav-drop-wrap.open .nav-drop-left,
.nav-drop-wrap:hover .nav-drop-right,
.nav-drop-wrap:focus-within .nav-drop-right,
.nav-drop-wrap.open .nav-drop-right { transform: translateY(0) scale(1); }
.nav-drop-wrap:hover .nav-drop:not(.nav-drop-left):not(.nav-drop-right),
.nav-drop-wrap:focus-within .nav-drop:not(.nav-drop-left):not(.nav-drop-right),
.nav-drop-wrap.open .nav-drop:not(.nav-drop-left):not(.nav-drop-right) { transform: translateX(-50%) translateY(0) scale(1); }
.nav-drop-inner {
  padding: 22px 24px 14px;
  max-height: 560px;
  overflow-y: auto;
  border-radius: 18px 18px 0 0;
}
.drop-group + .drop-group { margin-top: 18px; padding-top: 16px; border-top: 1px dashed var(--line-2); }
.drop-group-title {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 9px;
}
.drop-group-title::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 2px;
  background: linear-gradient(135deg, var(--orange), var(--orange-2));
}
.drop-cols { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 4px 8px; }
.drop-group:only-child .drop-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.drop-cols a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 10px;
  font-size: 13.5px;
  color: var(--ink-2);
  border: 1px solid transparent;
  transition: background 0.16s, color 0.16s, border-color 0.16s, transform 0.16s, box-shadow 0.16s;
}
.drop-cols a span {
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--orange);
  background: rgba(255, 94, 0, 0.08);
  border-radius: 5px;
  padding: 2px 6px;
  min-width: 46px;
  text-align: center;
  flex-shrink: 0;
}
.drop-cols a:hover {
  background: #fff;
  color: var(--orange);
  border-color: rgba(255, 94, 0, 0.28);
  box-shadow: 0 10px 20px rgba(16, 27, 45, 0.07);
  transform: translateY(-2px);
}
.drop-all {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 14px;
  font-size: 13px;
  font-weight: 700;
  color: var(--orange);
  border-top: 1px solid var(--line);
  border-radius: 0 0 17px 17px;
  background: linear-gradient(0deg, rgba(255, 94, 0, 0.05), transparent);
  transition: background 0.15s, letter-spacing 0.15s;
}
.drop-all:hover { background: rgba(255, 94, 0, 0.1); letter-spacing: 0.03em; }

/* 顶部行动按钮 */
.header-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-left: 4px;
  padding: 13px 24px;
  font-size: 14.5px;
  font-weight: 600;
  letter-spacing: 0.02em;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--orange), var(--orange-2));
  color: #fff;
  white-space: nowrap;
  box-shadow: 0 10px 24px rgba(255, 94, 0, 0.28);
  transition: transform 0.2s, box-shadow 0.2s;
}
.header-cta::after {
  content: "";
  width: 6px;
  height: 6px;
  margin-left: 2px;
  border-top: 2px solid currentColor;
  border-right: 2px solid currentColor;
  transform: rotate(45deg);
  transition: transform 0.2s;
}
.header-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 30px rgba(255, 94, 0, 0.36);
}
.header-cta:hover::after { transform: translate(2px, 0) rotate(45deg); }
.nav-toggle {
  display: none;
  width: 46px;
  height: 46px;
  align-items: center;
  justify-content: center;
  background: #fff;
  border: 1px solid var(--line-2);
  border-radius: 14px;
  font-size: 18px;
  line-height: 1;
  padding: 0;
  cursor: pointer;
  color: var(--ink);
  margin-left: auto;
  transition: border-color 0.15s, color 0.15s, background 0.15s;
}
.nav-toggle:hover { border-color: var(--orange); color: var(--orange); background: rgba(255, 94, 0, 0.04); }
.main-nav > a:focus-visible,
.nav-drop-wrap > .drop-toggle:focus-visible,
.header-cta:focus-visible { border-radius: 999px; }
.main-nav > a.on:hover,
.nav-drop-wrap.on > .drop-toggle:hover { background: rgba(255, 94, 0, 0.05); }

/* ============ 按钮 ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 600;
  padding: 11px 24px;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.18s, box-shadow 0.18s, background 0.18s, color 0.18s, border-color 0.18s;
  font-family: var(--sans);
}
.btn span { transition: transform 0.18s; }
.btn-primary,
.btn-orange {
  background: linear-gradient(135deg, var(--orange), var(--orange-2));
  color: #fff;
  box-shadow: 0 5px 18px rgba(255, 94, 0, 0.28);
}
.btn-primary:hover,
.btn-orange:hover { transform: translateY(-2px); box-shadow: 0 10px 26px rgba(255, 94, 0, 0.36); }
.btn-primary:hover span { transform: translateX(3px); }
.btn-primary:active,
.btn-orange:active { transform: translateY(0); box-shadow: 0 4px 12px rgba(255, 94, 0, 0.3); }
.btn-ghost { background: var(--card); color: var(--ink); border-color: var(--line-2); }
.btn-ghost:hover { border-color: var(--orange); color: var(--orange); box-shadow: 0 6px 18px rgba(255, 94, 0, 0.12); }
.btn-big { padding: 14px 32px; font-size: 16px; }
.btn-sm { padding: 8px 18px; font-size: 13.5px; }
.btn:disabled { opacity: 0.6; cursor: not-allowed; transform: none; }

/* ============ 区块骨架 ============ */
.sec { padding: 72px 0; }
.sec-alt { background: var(--bg-soft); }
.sec-head { display: flex; align-items: flex-end; gap: 20px; margin-bottom: 38px; flex-wrap: wrap; }
.sec-no {
  font-family: var(--mono);
  font-size: 36px;
  font-weight: 700;
  line-height: 1;
  padding-bottom: 6px;
  color: var(--orange);
  opacity: 0.92;
}
.sec-no-light { color: var(--orange-2); }
.sec-title { font-size: 30px; font-weight: 800; line-height: 1.32; letter-spacing: 0.01em; }
.sec-sub { color: var(--ink-soft); font-size: 15px; margin-top: 6px; }
.sec-more {
  margin-left: auto;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--orange);
  white-space: nowrap;
  transition: letter-spacing 0.15s, color 0.15s;
}
.sec-more:hover { letter-spacing: 0.04em; color: var(--orange-2); }

/* ============ 页头与面包屑 ============ */
.page-head { padding: 46px 0 8px; }
.crumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 2px;
  font-family: var(--mono);
  font-size: 12px;
  color: #9aaaba;
  margin-bottom: 14px;
}
.crumbs a { transition: color 0.15s; }
.crumbs a:hover { color: var(--orange); }
.crumbs .cur { color: var(--ink-soft); }
.page-title { font-size: 38px; font-weight: 800; line-height: 1.26; letter-spacing: 0.01em; }
.page-sub { color: var(--ink-soft); margin-top: 10px; max-width: 780px; }
.page-sub a { color: var(--orange); font-weight: 600; }
.page-sub a:hover { text-decoration: underline; }
.svc-detail-code {
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.14em;
  color: var(--orange);
  margin-bottom: 8px;
  font-weight: 600;
}

/* ============ 小标题 ============ */
.blk-title {
  font-size: 21px;
  font-weight: 800;
  margin: 40px 0 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  line-height: 1.4;
}
.blk-title::before {
  content: "";
  width: 5px;
  height: 22px;
  border-radius: 3px;
  background: linear-gradient(180deg, var(--orange), var(--orange-2));
  flex-shrink: 0;
}

/* ============ 服务清单（首页 / 服务目录 / 产品页共用） ============ */
.svc-table { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.svc-row {
  display: grid;
  grid-template-columns: 60px minmax(0, 1fr) 30px;
  grid-template-areas:
    "code name arrow"
    "code tag arrow";
  align-items: center;
  gap: 2px 14px;
  padding: 16px 18px;
  border-radius: var(--radius);
  background: var(--card);
  border: 1px solid var(--line);
  position: relative;
  overflow: hidden;
  transition: transform 0.18s, box-shadow 0.18s, border-color 0.18s;
}
.svc-row::before {
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--orange), var(--orange-2));
  opacity: 0;
  transition: opacity 0.18s;
}
.svc-row:hover { border-color: var(--orange-line); box-shadow: var(--shadow-hover); transform: translateY(-3px); }
.svc-row:hover::before { opacity: 1; }
.svc-row:active { transform: translateY(-1px); }
.svc-code {
  grid-area: code;
  font-family: var(--mono);
  font-size: 11.5px;
  font-weight: 600;
  color: var(--orange);
  background: var(--orange-soft);
  border-radius: 7px;
  padding: 5px 0;
  text-align: center;
  align-self: start;
}
.svc-name { grid-area: name; font-weight: 700; font-size: 16px; display: flex; align-items: center; gap: 8px; }
.svc-flag {
  font-style: normal;
  font-size: 10px;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(135deg, var(--orange), var(--orange-2));
  padding: 1px 7px;
  border-radius: 999px;
  line-height: 1.7;
  letter-spacing: 0.06em;
}
.svc-tag {
  grid-area: tag;
  color: var(--ink-soft);
  font-size: 13px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.svc-cat { display: none; }
.svc-arrow { grid-area: arrow; text-align: right; font-size: 17px; color: #c3cede; transition: color 0.18s, transform 0.18s; }
.svc-row:hover .svc-arrow { color: var(--orange); transform: translateX(4px); }
.svc-cat-divider {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 26px 0 10px;
}
.svc-cat-divider:first-child { padding-top: 0; }
.svc-cat-divider span { font-size: 17px; font-weight: 700; letter-spacing: 0.02em; }
.svc-cat-divider i { flex: 1; height: 1px; background: linear-gradient(90deg, var(--line-2), transparent); }

/* ============ 侧栏卡片 ============ */
.side-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--card);
  padding: 20px 22px;
  box-shadow: var(--shadow);
}
.side-card h3 {
  font-size: 16px;
  font-weight: 700;
  padding-bottom: 10px;
  margin-bottom: 10px;
  border-bottom: 2px solid transparent;
  border-image: linear-gradient(90deg, var(--orange), var(--orange-2)) 1;
}
.side-card dl { font-size: 13.5px; }
.side-card dt { font-family: var(--mono); font-size: 11px; color: #93a3b5; margin-top: 9px; }
.side-card dd { color: var(--ink); font-weight: 500; }
.side-card dd a { color: var(--orange); }
.side-card dd a:hover { text-decoration: underline; }
.side-sub { margin-top: 16px; }
.side-points { list-style: none; }
.side-points li { position: relative; padding: 6px 0 6px 18px; font-size: 13.5px; color: var(--ink-soft); }
.side-points li::before {
  content: "";
  position: absolute;
  left: 3px; top: 14px;
  width: 6px; height: 6px;
  border-radius: 2px;
  background: linear-gradient(135deg, var(--orange), var(--orange-2));
}
.side-rel { list-style: none; }
.side-rel a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 0;
  font-size: 14px;
  border-bottom: 1px dashed var(--line);
  transition: color 0.15s;
}
.side-rel a:last-child { border-bottom: none; }
.side-rel a span { font-family: var(--mono); font-size: 11px; color: var(--orange); }
.side-rel a i { margin-left: auto; font-style: normal; color: #c3cede; transition: transform 0.15s, color 0.15s; }
.side-rel a:hover { color: var(--orange); }
.side-rel a:hover i { color: var(--orange); transform: translateX(3px); }
.side-lecture {
  display: block;
  border: 1.5px dashed rgba(255, 94, 0, 0.48);
  border-radius: var(--radius);
  padding: 16px 18px;
  background: rgba(255, 94, 0, 0.03);
  transition: background 0.16s, border-color 0.16s, border-style 0.16s;
}
.side-lecture:hover { background: rgba(255, 94, 0, 0.08); border-style: solid; }
.side-lecture b { display: block; font-size: 14.5px; color: var(--orange); margin-bottom: 3px; }
.side-lecture span { font-size: 12.5px; color: var(--ink-soft); }
.side-tip { font-size: 12.5px; color: #93a3b5; margin-top: 10px; }

/* ============ 折叠问答 ============ */
.faq-list details {
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--card);
  margin-bottom: 9px;
  overflow: hidden;
  transition: border-color 0.16s, box-shadow 0.16s;
}
.faq-list details:hover { border-color: var(--orange-line); }
.faq-list details[open] { border-color: var(--orange-line); box-shadow: var(--shadow); }
.faq-list summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 14px 18px;
  cursor: pointer;
  font-weight: 600;
  font-size: 15px;
  list-style: none;
  transition: background 0.15s, color 0.15s;
}
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary:hover { background: var(--bg-soft); color: var(--orange); }
.faq-list summary::after {
  content: "+";
  font-family: var(--mono);
  font-size: 19px;
  color: var(--orange);
  flex-shrink: 0;
  transition: transform 0.2s;
}
.faq-list details[open] summary::after { content: "−"; }
.faq-list details[open] summary { border-bottom: 1px solid var(--line); }
.faq-list details > div,
.faq-list details > p { padding: 14px 18px 16px; font-size: 14.5px; color: var(--ink-soft); }
.faq-list details p + p { padding-top: 0; }
.faq-list details a { color: var(--orange); }

/* ============ 表单（询盘 / 预约共用） ============ */
.lecture-form {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--card);
  padding: 28px 28px 24px;
  box-shadow: var(--shadow);
}
.lecture-form h3,
.lecture-form .form-title {
  font-size: 19px;
  font-weight: 800;
  margin-bottom: 18px;
  padding-bottom: 12px;
  border-bottom: 2px solid transparent;
  border-image: linear-gradient(90deg, var(--orange), var(--orange-2)) 1;
}
.lecture-form label { display: block; font-size: 13.5px; color: var(--ink-2); margin-bottom: 12px; font-weight: 500; }
.lecture-form label i { color: var(--orange); font-style: normal; }
.lecture-form input,
.lecture-form select,
.lecture-form textarea {
  display: block;
  width: 100%;
  margin-top: 5px;
  padding: 10px 13px;
  border: 1px solid var(--line-2);
  border-radius: var(--radius-sm);
  background: var(--bg);
  font-size: 14.5px;
  font-family: var(--sans);
  color: var(--ink);
  transition: border-color 0.15s, background 0.15s, box-shadow 0.15s;
}
.lecture-form input:hover,
.lecture-form select:hover,
.lecture-form textarea:hover { border-color: #b8c6d8; }
.lecture-form input:focus,
.lecture-form select:focus,
.lecture-form textarea:focus {
  outline: none;
  border-color: var(--orange);
  background: #fff;
  box-shadow: 0 0 0 3px rgba(255, 94, 0, 0.12);
}
.lecture-form textarea { resize: vertical; }
.lecture-form button[type="submit"] { width: 100%; margin-top: 6px; }
.form-note { font-size: 12px; color: #93a3b5; margin-top: 11px; }
.form-2col { display: grid; grid-template-columns: 1fr 1fr; gap: 0 14px; }
.hp-field { position: absolute; left: -9999px; width: 1px; height: 1px; opacity: 0; }
.form-status { font-size: 13.5px; margin-top: 10px; min-height: 1.2em; }
.form-status.ok { color: var(--ok); font-weight: 600; }
.form-status.err { color: var(--danger); font-weight: 600; }

/* ============ 收尾 CTA ============ */
.cta-final {
  background:
    radial-gradient(680px 300px at 82% 18%, rgba(255, 94, 0, 0.2), transparent 62%),
    var(--dark);
  color: #e6edf6;
  padding: 64px 0;
  text-align: center;
}
.cta-final h2 { font-size: 29px; font-weight: 800; margin-bottom: 12px; }
.cta-final p { color: #9fb0c6; max-width: 640px; margin: 0 auto 28px; }
.cta-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.cta-small { padding: 46px 0; }

/* ============ 列表筛选（资讯 / 服务目录共用） ============ */
.news-filter { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 24px; align-items: center; }
.news-filter a {
  font-size: 13.5px;
  padding: 6px 15px;
  border-radius: 999px;
  border: 1px solid var(--line-2);
  color: var(--ink-soft);
  background: var(--card);
  transition: border-color 0.15s, color 0.15s, background 0.15s;
}
.news-filter a i { font-style: normal; font-size: 11px; color: #9aaaba; margin-left: 4px; }
.news-filter a:hover { border-color: var(--orange); color: var(--orange); }
.news-filter a.on { background: var(--ink); border-color: var(--ink); color: #fff; }
.news-filter a.on i { color: var(--orange-2); }
.news-search { display: flex; gap: 8px; margin-left: auto; align-items: center; }
.news-search input {
  width: 220px;
  max-width: 46vw;
  border: 1px solid var(--line-2);
  border-radius: 999px;
  padding: 7px 16px;
  font-size: 13.5px;
  background: #fff;
  color: var(--ink);
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.news-search input:focus { border-color: var(--orange); box-shadow: 0 0 0 3px rgba(255, 94, 0, 0.12); }
.empty-tip { padding: 44px 0; text-align: center; color: var(--ink-soft); font-size: 14.5px; }

/* 资讯卡片里的元信息（首页与列表共用） */
.news-meta { font-family: var(--mono); font-size: 11.5px; color: #93a3b5; }
.news-sum { font-size: 13.5px; color: var(--ink-soft); }

/* ============ 页脚 ============ */
.site-footer {
  background:
    radial-gradient(640px 280px at 88% 0%, rgba(255, 94, 0, 0.08), transparent 62%),
    var(--dark);
  color: #93a3b5;
  padding: 50px 0 0;
  margin-top: 64px;
  border-top: 3px solid transparent;
  border-image: linear-gradient(90deg, var(--orange), var(--orange-2), transparent 72%) 1;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.45fr 0.8fr 0.9fr 1.2fr;
  gap: 40px;
  align-items: start;
}
.f-brand { min-width: 0; }
.f-logo { display: flex; align-items: center; gap: 11px; margin-bottom: 15px; }
.f-logo img { border-radius: 7px; transition: transform 0.22s; }
.f-logo:hover img { transform: translateY(-2px) rotate(-3deg); }
.f-logo b { font-size: 19px; color: #f4f8fc; font-weight: 800; letter-spacing: 0.04em; }
.f-desc { font-size: 13.5px; line-height: 1.85; color: #8698ac; max-width: 30em; }
.f-mission {
  font-size: 12.5px;
  color: var(--orange-2);
  font-weight: 600;
  letter-spacing: 0.03em;
  margin-top: 10px;
  padding-left: 11px;
  border-left: 2px solid rgba(255, 144, 64, 0.5);
}
.f-col > a.f-btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin-top: 18px;
  border-radius: 999px;
  padding: 9px 20px;
  font-size: 13.5px;
  color: #fff;
  font-weight: 600;
  background: linear-gradient(135deg, var(--orange), var(--orange-2));
  box-shadow: 0 5px 16px rgba(255, 94, 0, 0.26);
  transition: transform 0.18s, box-shadow 0.18s, filter 0.18s;
}
.f-col > a.f-btn:hover { color: #fff; transform: translateY(-2px); box-shadow: 0 10px 24px rgba(255, 94, 0, 0.34); filter: saturate(1.08); }
.f-col > a.f-btn:active { transform: translateY(0); }
.f-col { min-width: 0; }
.f-col h3 {
  font-size: 13px;
  color: #dbe5f1;
  font-weight: 700;
  letter-spacing: 0.1em;
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
  display: flex;
  align-items: center;
  gap: 8px;
}
.f-col h3::before {
  content: "";
  width: 12px;
  height: 2px;
  border-radius: 2px;
  background: var(--orange);
  flex-shrink: 0;
}
.f-col a { display: inline-block; font-size: 13.5px; color: #8698ac; padding: 5px 0; transition: color 0.18s, transform 0.18s; }
.f-col a:hover { color: var(--orange-2); transform: translateX(3px); }
.f-col > a { display: block; }
.f-contact p { font-size: 13px; color: #9aabbd; padding: 4px 0; display: flex; gap: 9px; align-items: baseline; }
.f-contact p a { color: #9aabbd; padding: 0; display: inline; }
.f-contact p a:hover { color: var(--orange-2); transform: none; }
.f-label { font-family: var(--mono); font-size: 10px; letter-spacing: 0.04em; color: rgba(255, 144, 64, 0.85); min-width: 50px; flex-shrink: 0; }

/* 站点导航：一行横向排布，不再占一整列 */
.footer-quick {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 20px;
  margin-top: 34px;
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.07);
}
.fq-label {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  color: #5d7089;
  text-transform: uppercase;
}
.footer-quick a {
  position: relative;
  font-size: 13px;
  color: #8698ac;
  padding: 2px 0;
  transition: color 0.18s;
}
.footer-quick a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: var(--orange-2);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.22s;
}
.footer-quick a:hover { color: #f0f5fb; }
.footer-quick a:hover::after { transform: scaleX(1); }

/* 底栏内容统一靠左，右侧留空以避开页面右下角的助手浮窗 */
.footer-bottom {
  display: flex;
  justify-content: flex-start;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 14px;
  padding-top: 14px;
  padding-bottom: 22px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}
.footer-bottom p { font-size: 12.5px; color: #5d7089; }
.footer-bottom a { color: #7d8fa5; transition: color 0.15s; }
.footer-bottom a:hover { color: var(--orange-2); }
.f-crawl { display: flex; gap: 14px; align-items: center; padding-left: 16px; border-left: 1px solid rgba(255, 255, 255, 0.1); }
.f-crawl a { font-family: var(--mono); font-size: 12px; }

/* ============ 滚动条（局部容器） ============ */
.scroll-thin { scrollbar-width: thin; scrollbar-color: rgba(100, 116, 139, 0.35) transparent; }
.scroll-thin::-webkit-scrollbar { width: 8px; height: 8px; }
.scroll-thin::-webkit-scrollbar-thumb { background: rgba(100, 116, 139, 0.35); border-radius: 999px; }
.scroll-thin::-webkit-scrollbar-track { background: transparent; }

/* ============ 入场动效（无 JS 时内容照常可见） ============ */
@keyframes riseIn { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: none; } }
.page-head .page-title { animation: riseIn 0.6s ease both; }

html.js .reveal { opacity: 0; translate: 0 18px; }
html.js .reveal.in {
  opacity: 1;
  translate: 0 0;
  transition:
    opacity 0.55s cubic-bezier(0.2, 0.7, 0.3, 1) var(--reveal-delay, 0ms),
    translate 0.55s cubic-bezier(0.2, 0.7, 0.3, 1) var(--reveal-delay, 0ms);
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  html.js .reveal { opacity: 1; translate: 0 0; }
}

/* ============ 响应式骨架 ============ */
@media (max-width: 1200px) {
  .nav-drop { width: 600px; max-width: calc(100vw - 40px); }
  .drop-cols, .drop-group:only-child .drop-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 1080px) {
  .footer-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 30px 26px; }
  .f-brand {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 2px 26px;
    padding-bottom: 22px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.07);
  }
  .f-logo { margin-bottom: 0; }
  .f-desc { max-width: 46em; margin-top: 8px; }
  .f-col > a.f-btn { grid-column: 2; grid-row: 1 / span 3; align-self: center; margin-top: 0; }
  .svc-table { grid-template-columns: 1fr; }
  .header-inner { gap: 14px; min-height: 82px; }
  .main-nav { gap: 2px; }
  .main-nav > a, .nav-drop-wrap > .drop-toggle { padding: 9px 9px; font-size: 14px; }
  .main-nav > a::after, .nav-drop-wrap > .drop-toggle::after { left: 9px; right: 9px; bottom: 4px; }
  .nav-drop { min-width: 0; width: 540px; max-width: calc(100vw - 40px); }
  .drop-cols, .drop-group:only-child .drop-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .logo img { width: 42px; height: 42px; }
  .logo-text b { font-size: 19px; }
  .header-cta { padding: 11px 18px; font-size: 13.5px; }
}
@media (max-width: 900px) {
  .main-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 12px 18px 18px;
    background: #fff;
    border-bottom: 1px solid var(--line);
    box-shadow: 0 18px 34px rgba(16, 27, 45, 0.12);
    max-height: 74vh;
    overflow-y: auto;
  }
  .site-header.open .main-nav { display: flex; }
  .main-nav > a, .nav-drop-wrap > .drop-toggle { width: 100%; justify-content: space-between; font-size: 15.5px; padding: 12px 14px; border-radius: 12px; }
  .main-nav > a::after, .nav-drop-wrap > .drop-toggle::after { display: none; }
  .main-nav > a:hover, .nav-drop-wrap > .drop-toggle:hover { background: rgba(255, 94, 0, 0.06); }
  .header-inner { min-height: 72px; gap: 12px; }
  .logo img { width: 38px; height: 38px; border-radius: 10px; }
  .logo-text b { font-size: 18px; }
  .logo-text i { font-size: 9px; letter-spacing: 0.2em; }
  .nav-drop-wrap { width: 100%; }
  .nav-drop,
  .nav-drop-left,
  .nav-drop-right {
    position: static;
    left: auto;
    right: auto;
    transform: none;
    opacity: 1;
    visibility: hidden;
    display: none;
    min-width: 0;
    max-width: none;
    width: auto;
    border: none;
    box-shadow: none;
    border-radius: 0;
    background: var(--bg-soft);
    padding: 6px 8px;
    margin: 4px 0 8px;
  }
  .nav-drop::after { display: none; }
  .nav-drop-wrap.open .nav-drop { visibility: visible; display: block; }
  .nav-drop-wrap:hover .nav-drop { transform: none; }
  .nav-drop-inner { padding: 8px; max-height: none; }
  .drop-cols,
  .drop-group:only-child .drop-cols { grid-template-columns: 1fr; }
  .nav-drop-wrap::after { display: none; }
  .drop-all { border-radius: 8px; margin-top: 6px; }
  .header-cta { display: none; }
  .nav-toggle { display: inline-flex; }
  .page-title { font-size: 31px; }
  .sec { padding: 50px 0; }
  .sec-title { font-size: 24px; }
  .sec-no { font-size: 28px; }
  .sec-head { margin-bottom: 28px; }
  .page-head { padding: 32px 0 6px; }
}
@media (max-width: 640px) {
  body { font-size: 15.5px; }
  .wrap { padding: 0 18px; }
  .form-2col { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 24px 18px; }
  .f-brand, .f-contact { grid-column: 1 / -1; }
  .f-brand { display: block; padding-bottom: 18px; }
  .f-desc { max-width: none; margin-top: 0; }
  .f-col > a.f-btn { margin-top: 14px; }
  .footer-quick { gap: 4px 16px; margin-top: 26px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; gap: 8px; }
  .lecture-form { padding: 22px 18px 20px; }
  .news-filter { gap: 6px; }
  .news-search { margin-left: 0; width: 100%; }
  .news-search input { flex: 1; max-width: none; width: auto; }
  .svc-row { grid-template-columns: 52px minmax(0, 1fr) 24px; padding: 14px; }
  .svc-name { font-size: 15px; }
  .svc-tag { font-size: 12.5px; }
}


/* ============ 顶栏滚动状态 ============ */
.site-header { transition: box-shadow 0.25s ease, background 0.25s ease; }
.site-header.is-scrolled {
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 12px 30px rgba(16, 27, 45, 0.1);
}

/* ============ 顶部阅读进度 ============ */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 80;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.3s ease;
}
.scroll-progress.on { opacity: 1; }
.scroll-progress i {
  display: block;
  height: 100%;
  width: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--orange), var(--orange-2));
  box-shadow: 0 0 10px rgba(255, 94, 0, 0.45);
}

/* ============ 回到顶部 ============ */
.to-top-btn {
  position: fixed;
  left: 20px;
  bottom: 20px;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  padding: 0;
  border: 1px solid var(--line-2);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.94);
  color: var(--ink-2);
  cursor: pointer;
  box-shadow: 0 8px 22px rgba(16, 27, 45, 0.14);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s, background 0.18s, color 0.18s, border-color 0.18s;
}
.to-top-btn.on { opacity: 1; visibility: visible; transform: none; }
.to-top-btn:hover {
  background: linear-gradient(135deg, var(--orange), var(--orange-2));
  border-color: transparent;
  color: #fff;
  transform: translateY(-2px);
}
.to-top-btn:active { transform: translateY(0); }
.to-top-btn svg { display: block; }

/* ============ 下拉菜单逐项入场 ============ */
@keyframes dropItemIn {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: none; }
}
.nav-drop-wrap:hover .nav-drop .drop-cols a,
.nav-drop-wrap:focus-within .nav-drop .drop-cols a,
.nav-drop-wrap.open .nav-drop .drop-cols a,
.nav-drop-wrap:hover .nav-drop .drop-all,
.nav-drop-wrap:focus-within .nav-drop .drop-all,
.nav-drop-wrap.open .nav-drop .drop-all {
  animation: dropItemIn 0.26s cubic-bezier(0.2, 0.7, 0.3, 1) both;
}
.nav-drop .drop-cols a:nth-child(1) { animation-delay: 0.010s; }
.nav-drop .drop-cols a:nth-child(2) { animation-delay: 0.028s; }
.nav-drop .drop-cols a:nth-child(3) { animation-delay: 0.046s; }
.nav-drop .drop-cols a:nth-child(4) { animation-delay: 0.064s; }
.nav-drop .drop-cols a:nth-child(5) { animation-delay: 0.082s; }
.nav-drop .drop-cols a:nth-child(6) { animation-delay: 0.100s; }
.nav-drop .drop-cols a:nth-child(7) { animation-delay: 0.118s; }
.nav-drop .drop-cols a:nth-child(8) { animation-delay: 0.136s; }
.nav-drop .drop-cols a:nth-child(9) { animation-delay: 0.154s; }
.nav-drop .drop-cols a:nth-child(10) { animation-delay: 0.172s; }
.nav-drop .drop-cols a:nth-child(11) { animation-delay: 0.190s; }
.nav-drop .drop-cols a:nth-child(12) { animation-delay: 0.208s; }
.nav-drop .drop-all { animation-delay: 0.12s; }

/* ============ 移动端菜单逐项滑入 ============ */
@keyframes navItemIn {
  from { opacity: 0; transform: translateX(-8px); }
  to { opacity: 1; transform: none; }
}
@media (max-width: 900px) {
  .site-header.open .main-nav > a,
  .site-header.open .main-nav > .nav-drop-wrap {
    animation: navItemIn 0.28s cubic-bezier(0.2, 0.7, 0.3, 1) both;
  }
  .site-header.open .main-nav > *:nth-child(1) { animation-delay: 0.02s; }
  .site-header.open .main-nav > *:nth-child(2) { animation-delay: 0.05s; }
  .site-header.open .main-nav > *:nth-child(3) { animation-delay: 0.08s; }
  .site-header.open .main-nav > *:nth-child(4) { animation-delay: 0.11s; }
  .site-header.open .main-nav > *:nth-child(5) { animation-delay: 0.14s; }
  .site-header.open .main-nav > *:nth-child(6) { animation-delay: 0.17s; }
  .site-header.open .main-nav > *:nth-child(7) { animation-delay: 0.2s; }
  .site-header.open .main-nav > *:nth-child(8) { animation-delay: 0.23s; }
}
@media (max-width: 640px) {
  .to-top-btn { left: 14px; bottom: 14px; width: 40px; height: 40px; }
}

/* ============ 案例分类下拉：紧凑面板 ============ */
.nav-drop.nav-drop-cases { width: 420px; min-width: 0; }
.nav-drop-cases .drop-cols { grid-template-columns: 1fr; }
@media (max-width: 900px) {
  .nav-drop.nav-drop-cases { width: auto; }
}