/* ===========================================================================
   广州星砥科技有限公司 官网 · 第二版（精简版）样式
   单页站点：公司简介 → 产品介绍 → 联系方式
   沿用第一版的品牌规范（深钢蓝 + 精密青 / 3px 圆角 / 系统字栈），
   不加载任何外部字体或 CDN。
   =========================================================================== */

:root {
  --navy:   #0A2540;
  --navy-2: #123A61;
  --cyan:   #22B8E6;
  --cyan-d: #0E86B0;
  --cyan-l: #7FB6E0;
  --ink:    #101828;
  --body:   #33445A;
  --muted:  #6B7C90;
  --line:   #E2E8F0;
  --line-2: #EEF2F7;
  --bg-alt: #F5F8FB;
  --warn:   #D9A400;
  --warn-bg:#FFF8E1;
  --maxw:   1080px;
  --r:      3px;
  --mono:   ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  --sans:   -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
            Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
            "Source Han Sans SC", "Noto Sans CJK SC", sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 84px; }
body { margin: 0; background: #fff; color: var(--body); font-family: var(--sans);
  font-size: 16px; line-height: 1.78; -webkit-font-smoothing: antialiased; }
img, svg { max-width: 100%; }
a { color: var(--cyan-d); text-decoration: none; }
a:hover { color: var(--navy); }
h1, h2, h3 { color: var(--navy); margin: 0; line-height: 1.3; font-weight: 650;
  letter-spacing: -.01em; }
h1 { font-size: clamp(27px, 3.4vw, 40px); }
h2 { font-size: clamp(22px, 2.4vw, 29px); margin-bottom: 26px; }
h3 { font-size: 17.5px; }
p { margin: 0 0 1em; }
b, strong { font-weight: 650; color: var(--navy); }

.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.skip { position: absolute; left: -9999px; }
.skip:focus { left: 12px; top: 12px; z-index: 99; background: var(--navy); color: #fff;
  padding: 10px 16px; border-radius: var(--r); }

/* 占位内容高亮：grep -rn 'class="ph"' . */
.ph { background: var(--warn-bg); border-bottom: 1px dashed var(--warn);
  padding: 0 2px; color: #7A5A00; cursor: help; }

/* ---------------------------------------------------------------- 头部 -- */
.hdr { position: sticky; top: 0; z-index: 20; background: rgba(255,255,255,.95);
  backdrop-filter: saturate(180%) blur(10px); border-bottom: 1px solid var(--line); }
.hdr__in { display: flex; align-items: center; gap: 20px; height: 68px; }
.brand { display: flex; align-items: center; gap: 10px; flex: 0 0 auto; }
.brand__t { display: flex; flex-direction: column; line-height: 1.2; }
.brand__t b { font-size: 16.5px; letter-spacing: .02em; }
.brand__t i { font-style: normal; font-size: 10.5px; color: var(--muted);
  letter-spacing: .04em; text-transform: uppercase; }
.nav { margin-left: auto; display: flex; gap: 4px; }
.nav a { padding: 8px 14px; font-size: 15px; font-weight: 500; color: var(--navy);
  border-radius: var(--r); white-space: nowrap; }
.nav a:hover { background: #EDF2F8; }
.hdr__right { display: flex; align-items: center; gap: 10px; flex: 0 0 auto; }
.langbtn { display: inline-flex; align-items: center; justify-content: center;
  min-width: 38px; height: 31px; padding: 0 10px; border: 1px solid var(--line);
  border-radius: var(--r); font-size: 12.5px; font-weight: 600; color: var(--navy);
  letter-spacing: .04em; }
.langbtn:hover { border-color: var(--cyan); color: var(--cyan-d); background: #EDF2F8; }

/* ---------------------------------------------------------------- 按钮 -- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 7px;
  padding: 13px 24px; border-radius: var(--r); font-size: 15px; font-weight: 600;
  border: 1px solid transparent; transition: .18s ease; white-space: nowrap; }
.btn--sm { padding: 8px 16px; font-size: 14px; }
.btn--primary { background: var(--cyan-d); color: #fff; }
.btn--primary:hover { background: var(--navy); color: #fff; }
.btn--ghost { border-color: rgba(255,255,255,.42); color: #fff; }
.btn--ghost:hover { background: rgba(255,255,255,.12); border-color: #fff; color: #fff; }
.hdr .btn--sm { background: var(--cyan-d); color: #fff; }
.hdr .btn--sm:hover { background: var(--navy); color: #fff; }

/* ---------------------------------------------------------------- 首屏 -- */
.hero { position: relative; overflow: hidden; background: var(--navy); }
.hero__bg { position: absolute; inset: 0; pointer-events: none;
  background:
    radial-gradient(700px 380px at 84% 24%, rgba(34,184,230,.20), transparent 68%),
    radial-gradient(520px 320px at 6% 92%, rgba(34,184,230,.09), transparent 70%),
    linear-gradient(180deg, #0A2540 0%, #0C2C4C 60%, #0A2540 100%); }
.hero__bg::after { content: ""; position: absolute; inset: 0; opacity: .5;
  background-image: linear-gradient(rgba(255,255,255,.045) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(255,255,255,.045) 1px, transparent 1px);
  background-size: 62px 62px;
  mask-image: radial-gradient(72% 62% at 50% 42%, #000, transparent); }
.hero__in { position: relative; display: grid; grid-template-columns: 1.12fr .88fr;
  gap: 46px; align-items: center; padding-top: 60px; padding-bottom: 60px; }
.hero__txt h1 { color: #fff; margin: 0 0 18px; }
.hero__lead { color: #C4D6E6; font-size: 17px; max-width: 520px; margin-bottom: 28px; }
.hero__cta { display: flex; gap: 12px; flex-wrap: wrap; }
.hero__ill { display: flex; justify-content: center; }
.ill { width: 100%; max-width: 340px; filter: drop-shadow(0 22px 42px rgba(0,0,0,.4)); }

/* ---------------------------------------------------------------- 版块 -- */
.section { padding: 68px 0; }
.section--alt { background: var(--bg-alt); border-top: 1px solid var(--line-2);
  border-bottom: 1px solid var(--line-2); }
.eb { font-family: var(--mono); font-size: 11.5px; font-weight: 600;
  letter-spacing: .14em; text-transform: uppercase; color: var(--cyan-d);
  margin: 0 0 8px; }
.prose { max-width: 640px; }
.prose p:last-child { margin-bottom: 0; }

.split { display: grid; grid-template-columns: 1.55fr .85fr; gap: 42px; align-items: start; }
.tags { display: flex; flex-wrap: wrap; gap: 9px; }
.tag { display: inline-flex; align-items: center; padding: 8px 15px; font-size: 13.6px;
  font-weight: 500; color: var(--navy); background: #fff; border: 1px solid var(--line);
  border-radius: 100px; }

.grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.card { background: #fff; border: 1px solid var(--line); border-radius: var(--r);
  padding: 24px 24px 20px; }
.card h3 { margin-bottom: 9px; }
.card h3::before { content: ""; display: block; width: 22px; height: 2px;
  background: var(--cyan); margin-bottom: 13px; }
.card p { margin: 0; font-size: 14.6px; line-height: 1.74; }
.note { margin: 20px 0 0; font-size: 14.2px; color: var(--muted);
  border-left: 3px solid var(--cyan-l); padding: 8px 0 8px 16px;
  background: rgba(127,182,224,.07); }

/* -------------------------------------------------------------- 联系方式 -- */
.contact { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0 42px; margin: 0; }
.crow { display: grid; grid-template-columns: 88px 1fr; gap: 14px; align-items: baseline;
  padding: 15px 0; border-bottom: 1px solid var(--line-2); }
.crow dt { color: var(--navy); font-weight: 600; font-size: 14.5px; }
.crow dd { margin: 0; font-size: 15.4px; }
.crow dd a { font-variant-numeric: tabular-nums; }

/* ---------------------------------------------------------------- 页脚 -- */
/* 备案号必须展示并链接至工信部备案系统 —— 法定要求，不属于可删的"内容" */
.ftr { background: #071B30; color: #8FA8C0; padding: 34px 0 38px; text-align: center; }
.ftr__copy { margin: 0 0 6px; font-size: 13.2px; }
.ftr__copy b { color: #C7D8E8; font-weight: 600; }
.ftr__lic { margin: 0 0 10px; font-size: 13.2px; color: #7A90A6; }
.ftr__lic a { color: #9EB6CC; }
.ftr__lic a:hover { color: var(--cyan); }
.ftr__lic .ph { background: rgba(217,164,0,.18); color: #E8C46A;
  border-bottom-color: rgba(217,164,0,.6); }
.sep { margin: 0 9px; opacity: .45; }
.ftr__top { margin: 0; font-size: 12.6px; }
.ftr__top a { color: #6F859B; }

/* ---------------------------------------------------------------- 响应式 -- */
@media (max-width: 1080px) {
  .hero__in { gap: 34px; }
  .nav a { padding: 8px 10px; font-size: 14.5px; }
  .brand__t i { display: none; }
}
@media (max-width: 820px) {
  .hero__in { grid-template-columns: 1fr; gap: 36px; padding-top: 46px; padding-bottom: 48px; }
  .hero__ill { order: -1; }
  .ill { max-width: 250px; }
  .split { grid-template-columns: 1fr; gap: 24px; }
  .grid { grid-template-columns: 1fr; }
  .contact { grid-template-columns: 1fr; }
  .nav { display: none; }                 /* 首屏按钮已可直达联系方式，小屏不再折叠菜单 */
  .hdr__in { justify-content: space-between; }
}
@media (max-width: 560px) {
  .wrap { padding: 0 18px; }
  .section { padding: 48px 0; }
  .crow { grid-template-columns: 74px 1fr; gap: 10px; }
  .hdr__right .btn--sm { display: none; }
}

@media print {
  .hdr, .ftr__top, .hero__bg { display: none; }
  .hero { background: none; color: #000; }
  .hero__txt h1, .hero__lead { color: #000; }
}