/* 上海零号机械 · CN01 蓝色工业风 */
:root {
  --blue: #1256b8;
  --blue-deep: #0a3a7d;
  --blue-bright: #2f80ed;
  --cyan: #38c6f0;
  --ink: #101820;
  --grey: #5d6b7a;
  --line: #dfe7f2;
  --paper: #f5f8fc;
  --mono: ui-monospace, Consolas, "Courier New", monospace;
  --max: 1200px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--paper) linear-gradient(rgba(18,86,184,.03) 1px, transparent 1px),
              linear-gradient(90deg, rgba(18,86,184,.03) 1px, transparent 1px);
  background-size: 56px 56px;
  color: var(--ink);
  font: 15px/1.75 "Microsoft YaHei", "PingFang SC", "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--blue); text-decoration: none; }
a:hover { color: var(--blue-deep); }
img { display: block; max-width: 100%; }
.wrap { width: min(var(--max), calc(100% - 44px)); margin-inline: auto; }
h1 { font-size: clamp(26px, 3.6vw, 40px); line-height: 1.25; margin: 10px 0 14px; }
h2 { font-size: clamp(20px, 2.2vw, 26px); line-height: 1.35; margin: 0 0 10px; }
p { color: #3c4a58; }
.sub { color: var(--grey); margin: 0 0 24px; max-width: 760px; }
.eyebrow { font-family: var(--mono); font-size: 12px; letter-spacing: .2em; color: var(--cyan); margin: 0 0 10px; }

/* 顶部 */
.nav { position: sticky; top: 0; z-index: 40; background: #0d223d; border-bottom: 2px solid var(--blue); }
.nav .wrap { display: flex; align-items: center; gap: 20px; height: 72px; }
.brand { display: flex; align-items: center; gap: 10px; color: #fff; }
.brand .logo { height: 32px; width: auto; }
.brand .cname { font-size: 16px; font-weight: 700; letter-spacing: .04em; }
#menu { display: flex; gap: 2px; margin-left: auto; }
#menu a { padding: 8px 14px; font-size: 14.5px; color: #c6d6e8; border-bottom: 2px solid transparent; }
#menu a:hover { color: #fff; background: rgba(56,198,240,.1); }
#menu a.on { color: #fff; border-bottom-color: var(--cyan); }
.tel { font-family: var(--mono); font-size: 13px; color: #eaf6ff; border: 1px solid rgba(56,198,240,.45); padding: 7px 12px; white-space: nowrap; }
.tel:hover { background: var(--blue); color: #fff; border-color: var(--blue); }
.burger { display: none; }

/* 首屏 */
.hero { position: relative; min-height: 520px; display: flex; align-items: center; color: #fff; background: #081625 center/cover no-repeat; }
.hero::before {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(95deg, rgba(6,16,30,.95) 0%, rgba(6,16,30,.82) 50%, rgba(6,16,30,.3) 100%),
              repeating-linear-gradient(90deg, rgba(56,198,240,.06) 0 1px, transparent 1px 64px);
}
.hero .wrap { position: relative; padding: 70px 0; }
.hero h1 { color: #fff; }
.hero .lead { color: #b8c9da; max-width: 620px; margin: 0 0 22px; font-size: 16px; }
.btn {
  display: inline-block; background: var(--blue); color: #fff; font-weight: 600;
  font-size: 14.5px; padding: 11px 22px; border: 1px solid var(--blue);
  clip-path: polygon(0 0, 100% 0, 100% 72%, calc(100% - 12px) 100%, 0 100%);
}
.btn:hover { background: var(--blue-bright); border-color: var(--blue-bright); color: #fff; }
.btn.ghost { background: transparent; border-color: rgba(56,198,240,.55); color: #d9f0ff; clip-path: none; margin-left: 10px; }
.btn.ghost:hover { background: rgba(56,198,240,.14); color: #fff; }
.btn.light { background: #fff; color: var(--blue-deep); border-color: #fff; clip-path: none; }

/* 指标 */
.metrics { background: #fff; border-bottom: 1px solid var(--line); }
.mrow { display: grid; grid-template-columns: repeat(4, 1fr); }
.mrow > div { padding: 24px 10px; border-right: 1px solid var(--line); }
.mrow > div:last-child { border-right: 0; }
.mrow b { display: block; font-family: var(--mono); font-size: 24px; color: var(--blue-deep); }
.mrow span { font-size: 12.5px; color: var(--grey); }

/* 板块 */
.sec { padding: 64px 0; }
.sec.mist { background: #eaf1fb; border-block: 1px solid var(--line); }
.sechead { display: flex; align-items: flex-end; justify-content: space-between; gap: 20px; flex-wrap: wrap; margin-bottom: 26px; }
.sechead p { margin: 4px 0 0; color: var(--grey); font-size: 14px; }
.more { font-size: 13.5px; }

/* 产品卡片 */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.card { display: flex; flex-direction: column; background: #fff; border: 1px solid var(--line); color: var(--ink); transition: .18s; }
.card:hover { transform: translateY(-3px); box-shadow: 0 16px 36px rgba(10,40,90,.12); color: var(--ink); }
.card .ph { aspect-ratio: 16/10; overflow: hidden; background: #e7eef8; }
.card .ph img { width: 100%; height: 100%; object-fit: cover; }
.card .pb { padding: 14px 16px 18px; }
.card h3 { margin: 0 0 6px; font-size: 16px; }
.card p { margin: 0; font-size: 13px; color: var(--grey); }
.card .go { display: inline-block; margin-top: 10px; font-size: 12.5px; color: var(--blue); }

/* 行业 */
.apps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.app { background: #fff; padding: 22px 20px; border-top: 3px solid var(--blue); }
.app b { display: block; font-size: 15.5px; margin-bottom: 6px; }
.app span { font-size: 13px; color: var(--grey); }
.apps.wide { grid-template-columns: repeat(3, 1fr); }

.split { display: grid; grid-template-columns: 1fr 1fr; gap: 36px; align-items: center; }
.split img { border: 1px solid var(--line); }

.cta { background: linear-gradient(120deg, #0a2a55, #08182e); color: #fff; padding: 40px 0; }
.cta .wrap { display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.cta h2 { color: #fff; margin: 0 0 6px; }
.cta p { color: #a9c0d6; margin: 0; }

/* 侧栏布局 */
.layout { display: grid; grid-template-columns: 280px minmax(0, 1fr); gap: 34px; padding: 34px 0 70px; align-items: start; }
.side { position: sticky; top: 96px; background: #fff; border: 1px solid var(--line); }
.side h2 { margin: 0; padding: 12px 16px; font-size: 12px; letter-spacing: .12em; color: #fff; background: var(--blue); }
.side nav { display: flex; flex-direction: column; }
.side a { padding: 10px 14px; font-size: 13.5px; color: #33465e; border-bottom: 1px solid var(--line); border-left: 3px solid transparent; }
.side a:hover { background: #f2f7ff; color: var(--blue); }
.side a.on { background: #e8f1ff; border-left-color: var(--blue); color: var(--blue-deep); font-weight: 700; }
.crumbs { font-size: 12px; color: var(--grey); margin: 0 0 6px; }

/* 图廊 / 参数 */
.gal { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-bottom: 22px; }
.gal a { aspect-ratio: 4/3; overflow: hidden; border: 1px solid var(--line); }
.gal img { width: 100%; height: 100%; object-fit: cover; }
.gal3 { grid-template-columns: repeat(3, 1fr); }
.content h2 { margin-top: 26px; font-size: 18px; padding-left: 10px; border-left: 3px solid var(--blue); }
.feat { margin: 0 0 18px; padding-left: 20px; }
.spec { width: 100%; border-collapse: collapse; font-size: 14px; border: 1px solid var(--line); margin: 8px 0 18px; background: #fff; }
.spec th, .spec td { padding: 9px 12px; border-bottom: 1px solid var(--line); text-align: left; }
.spec th { width: 38%; background: #eef4fd; font-weight: 600; }
.spec td { font-family: var(--mono); font-size: 13px; }
.item { display: flex; gap: 14px; background: #fff; border: 1px solid var(--line); padding: 12px; color: var(--ink); margin-bottom: 18px; }
.item:hover { border-color: var(--blue); color: var(--ink); }
.item img { width: 160px; height: 108px; object-fit: cover; }
.item b { display: block; font-size: 15px; margin-bottom: 4px; }
.item small { display: block; color: var(--grey); font-size: 12.5px; }
.item .go { display: inline-block; margin-top: 8px; font-size: 12.5px; color: var(--blue); }
video { width: 100%; background: #000; margin: 14px 0; border: 1px solid var(--line); }
.enquire { margin-top: 22px; padding: 20px 22px; background: #eef4fd; border-left: 3px solid var(--blue); }
.enquire p { margin: 0 0 12px; }

/* 其他页 */
.pagehead { padding: 34px 0 6px; }
.about { max-width: 860px; padding-bottom: 60px; }
.about h2 { font-size: 19px; margin-top: 26px; }
.note { color: var(--grey); font-size: 14px; }
.contact { display: grid; gap: 12px; padding-bottom: 70px; max-width: 860px; }
.ccard { background: #fff; border: 1px solid var(--line); border-left: 3px solid var(--blue); padding: 16px 20px; }
.ccard .mono { font-family: var(--mono); font-size: 11.5px; color: var(--grey); letter-spacing: .1em; }
.ccard a, .ccard b { display: block; font-size: 19px; font-weight: 700; color: var(--ink); margin: 4px 0; }
.ccard p { margin: 0; font-size: 12.5px; color: var(--grey); }

/* 页脚 */
footer { background: #0c1b2e; color: #9db2c8; padding: 48px 0 22px; font-size: 13.5px; }
footer .cols { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 34px; }
footer h4 { color: #fff; font-size: 12px; letter-spacing: .14em; margin: 0 0 12px; }
footer p { margin: 0 0 7px; color: #9db2c8; }
footer a { color: #d7e5f5; display: block; margin-bottom: 6px; }
footer a:hover { color: var(--cyan); }
footer .brand { margin-bottom: 12px; }
footer .brand .logo { height: 28px; }
footer .bottom { margin-top: 30px; padding-top: 16px; border-top: 1px solid rgba(255,255,255,.1); color: #6f849b; font-size: 12px; }

/* 灯箱 */
.lightbox { position: fixed; inset: 0; z-index: 200; background: rgba(6,10,16,.94); display: none; align-items: center; justify-content: center; }
.lightbox.on { display: flex; }
.lightbox img { max-width: 92vw; max-height: 86vh; object-fit: contain; }
.lb-btn { position: absolute; width: 44px; height: 44px; background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.35); color: #fff; font-size: 19px; cursor: pointer; }
.lb-btn:hover { background: var(--blue); border-color: var(--blue); }
.lb-close { top: 18px; right: 20px; }
.lb-prev { left: 20px; top: 50%; transform: translateY(-50%); }
.lb-next { right: 20px; top: 50%; transform: translateY(-50%); }
.lb-count { position: absolute; bottom: 20px; left: 50%; transform: translateX(-50%); color: #b7c6d6; font-family: var(--mono); font-size: 12px; }

@media (max-width: 1020px) {
  .mrow { grid-template-columns: repeat(2, 1fr); }
  .cards, .apps, .apps.wide { grid-template-columns: repeat(2, 1fr); }
  .layout { grid-template-columns: 1fr; }
  .side { position: static; }
  .side nav { flex-direction: row; flex-wrap: wrap; }
  .side a { border: 1px solid var(--line); margin: 0 4px 4px 0; }
  .split { grid-template-columns: 1fr; }
  .gal, .gal3 { grid-template-columns: repeat(3, 1fr); }
  footer .cols { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  #menu { display: none; position: absolute; top: 72px; left: 0; right: 0; flex-direction: column; background: #0d223d; padding: 10px 16px 16px; }
  #menu.open { display: flex; }
  .burger { display: inline-flex; flex-direction: column; gap: 4px; background: none; border: 0; padding: 8px 4px; margin-left: auto; }
  .burger span { width: 20px; height: 2px; background: #fff; display: block; }
  .tel { display: none; }
  .brand .cname { display: none; }
  .cards, .apps, .apps.wide { grid-template-columns: 1fr; }
  .gal, .gal3 { grid-template-columns: repeat(2, 1fr); }
  .wrap { width: calc(100% - 32px); }
  .sec { padding: 44px 0; }
}

/* AI 摘要块 / FAQ */
.aibox { background: #eaf3ff; border-left: 4px solid var(--blue); padding: 14px 18px; margin: 0 0 20px; }
.aibox b { display: block; font-size: 12px; letter-spacing: .1em; color: var(--blue-deep); margin-bottom: 4px; }
.aibox p { margin: 0; font-size: 14.5px; color: #22303f; }
.faq { margin: 6px 0 20px; }
.faq details { border-bottom: 1px solid var(--line); padding: 10px 0; }
.faq summary { cursor: pointer; font-weight: 600; font-size: 14.5px; color: #1b3a5c; }
.faq summary::marker { color: var(--blue); }
.faq p { margin: 8px 0 0; font-size: 13.5px; color: #46586b; }

/* 解决痛点（折弯机） */
.pain { margin: 30px 0 26px; }
.pain h2 { margin-top: 0; }
.pain-intro { color: #46586b; font-size: 14.5px; margin: 0 0 18px; max-width: 820px; }
.pain-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 14px; }
.pain .pc { background: #fff; border: 1px solid var(--line); border-top: 3px solid var(--blue); padding: 16px 18px 18px; }
.pain .pno { font-family: var(--mono); font-size: 11.5px; color: var(--blue); letter-spacing: .12em; }
.pain .pc h3 { margin: 6px 0 2px; font-size: 16px; }
.pain .pc b { display: block; color: var(--blue-deep); font-size: 13px; margin-bottom: 8px; }
.pain .pc p { margin: 0; font-size: 13px; color: #46586b; line-height: 1.7; }
.pain-grid.four { grid-template-columns: repeat(2, 1fr); }
.pain-quote { margin: 16px 0 0; padding-left: 12px; border-left: 3px solid var(--blue); color: #1b3a5c; font-weight: 600; font-size: 14px; }
@media (max-width: 1020px) { .pain-grid { grid-template-columns: repeat(2, 1fr); } }\n@media (max-width: 640px) { .pain-grid { grid-template-columns: 1fr; } }