/* ==========================================================================
   鼎城砂石 · 官网样式（浅色科技蓝，品牌宣传版）
   纯手写 CSS，不依赖 UI 框架；断点 1080 / 860 / 560
   ========================================================================== */

:root{
  --blue-900:#0b2f63;
  --blue-700:#114b9e;
  --blue-600:#1668dc;
  --blue-500:#2f80ed;
  --blue-100:#e8f1ff;
  --blue-50:#f4f8ff;
  --ink:#15263c;
  --ink-2:#41546e;
  --ink-3:#6c7f97;
  --line:#dde6f2;
  --bg:#ffffff;
  --bg-alt:#f6f9fd;
  --radius:14px;
  --shadow-sm:0 1px 2px rgba(16,42,80,.06), 0 4px 14px rgba(16,42,80,.05);
  --shadow-md:0 12px 34px rgba(16,42,80,.10);
  --wrap:1180px;
  --gap:22px;
  --font:"PingFang SC","Microsoft YaHei","Hiragino Sans GB","Source Han Sans SC","Noto Sans CJK SC",system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:var(--font);
  color:var(--ink);
  background:var(--bg);
  font-size:16px;
  line-height:1.72;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4{margin:0;line-height:1.26;font-weight:800;letter-spacing:-.01em}
h1{font-size:clamp(34px,5vw,58px)}
h2{font-size:clamp(24px,3vw,36px)}
h3{font-size:18px}
p{margin:0 0 14px}
b{font-weight:700}
code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:13px}

.wrap{width:min(100% - 44px, var(--wrap));margin-inline:auto}

/* ---------- 通用小块 ---------- */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 10px;border-radius:999px;font-size:12.5px;font-weight:700;
  background:var(--blue-100);color:var(--blue-700);border:1px solid #cfe1ff;
}
.tag-test{background:#fff4e5;color:#9a5a00;border-color:#ffd8a8}
.tag-blue{background:var(--blue-100);color:var(--blue-700);border-color:#cfe1ff}
.tag-green{background:#e6f7ee;color:#0e7a45;border-color:#b9e8cf}
.tag-orange{background:#fff3e0;color:#9a5a00;border-color:#ffdcab}

.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:13px;font-weight:700;color:var(--blue-600);
  letter-spacing:.04em;margin:0 0 14px;
}
.eyebrow .dot{width:7px;height:7px;border-radius:50%;background:var(--blue-500);box-shadow:0 0 0 4px var(--blue-100)}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 22px;border-radius:11px;font-size:15px;font-weight:700;
  border:1px solid transparent;cursor:pointer;transition:.18s ease;
  font-family:inherit;
}
.btn-sm{padding:9px 16px;font-size:14px;border-radius:9px}
.btn-primary{background:var(--blue-600);color:#fff;box-shadow:0 6px 18px rgba(22,104,220,.22)}
.btn-primary:hover{background:var(--blue-700);transform:translateY(-1px)}
.btn-ghost{background:#fff;color:var(--blue-700);border-color:#c9dbf7}
.btn-ghost:hover{background:var(--blue-50);border-color:var(--blue-500)}
.btn-white{background:#fff;color:var(--blue-700)}
.btn-white:hover{transform:translateY(-1px);box-shadow:var(--shadow-md)}
.btn-outline{background:transparent;color:#fff;border-color:rgba(255,255,255,.55)}
.btn-outline:hover{background:rgba(255,255,255,.12)}

/* 占位内容标记：上线前搜 .ph 逐个替换 */
.ph{color:var(--ink-3);font-style:normal}
.ph::after{
  content:"占位";font-size:10.5px;font-weight:700;color:#9a5a00;
  background:#fff3e0;border:1px solid #ffdcab;border-radius:4px;
  margin-left:6px;padding:0 4px;vertical-align:1px;
}
.qr-flag{
  position:absolute;top:8px;right:8px;
  font-size:10.5px;font-weight:700;color:#9a5a00;background:#fff3e0;
  border:1px solid #ffdcab;border-radius:4px;padding:1px 5px;
}
.qr-flag.ph::after{content:none}

/* ---------- 顶部测试条 ---------- */
.test-flag{
  display:flex;align-items:center;gap:10px;flex-wrap:wrap;
  background:#fffaf2;border-bottom:1px solid #ffe3ba;
  color:#8a5200;font-size:13px;padding:8px 0;
}

/* ---------- 导航 ---------- */
.nav{
  position:sticky;top:0;z-index:50;background:rgba(255,255,255,.88);
  backdrop-filter:saturate(180%) blur(10px);border-bottom:1px solid transparent;
  transition:border-color .2s, box-shadow .2s;
}
.nav.is-stuck{border-bottom-color:var(--line);box-shadow:0 4px 18px rgba(16,42,80,.06)}
.nav-inner{display:flex;align-items:center;gap:26px;height:68px}
.brand{display:inline-flex;align-items:center;gap:10px;color:var(--blue-600)}
.brand-mark{width:32px;height:32px;flex:none}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-text strong{font-size:17px;color:var(--ink);letter-spacing:.01em}
.brand-text em{font-size:10px;font-style:normal;color:var(--ink-3);letter-spacing:.14em}
.brand-light{color:#8ab6ff}
.brand-light .brand-text strong{color:#fff}
.brand-light .brand-text em{color:#b9cbe6}

.menu{display:flex;align-items:center;gap:2px;margin-left:auto}
.menu a{
  padding:8px 13px;border-radius:9px;font-size:14.5px;font-weight:600;color:var(--ink-2);
  transition:.15s;
}
.menu a:hover{color:var(--blue-600);background:var(--blue-50)}
.menu a.is-active{color:var(--blue-600);background:var(--blue-100)}
.nav-cta{display:flex;align-items:center;gap:10px}
.burger{display:none;width:40px;height:38px;border:1px solid var(--line);border-radius:9px;background:#fff;padding:9px 8px}
.burger span{display:block;height:2px;background:var(--ink);border-radius:2px;margin:3px 0;transition:.2s}
.burger[aria-expanded="true"] span:nth-child(1){transform:translateY(5px) rotate(45deg)}
.burger[aria-expanded="true"] span:nth-child(2){opacity:0}
.burger[aria-expanded="true"] span:nth-child(3){transform:translateY(-5px) rotate(-45deg)}

/* ---------- HERO ---------- */
.hero{position:relative;padding:64px 0 78px;overflow:hidden}
.hero-bg{position:absolute;inset:0;z-index:-1;background:
  radial-gradient(1100px 460px at 78% -8%, var(--blue-100) 0%, rgba(232,241,255,0) 62%),
  linear-gradient(180deg,#fff 0%, var(--bg-alt) 100%);}
.hero-bg svg{position:absolute;bottom:0;left:0;width:100%;height:320px}
.hero-inner{display:grid;grid-template-columns:1.08fr .92fr;gap:48px;align-items:center}
.hero h1{margin:0 0 18px}
.hl{color:var(--blue-600);position:relative;white-space:nowrap}
.hl::after{content:"";position:absolute;left:0;right:0;bottom:.04em;height:.30em;background:#ffd98a;opacity:.55;z-index:-1}
.lead{font-size:17px;color:var(--ink-2);max-width:620px}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin:26px 0 26px}
.hero-facts{list-style:none;display:flex;flex-wrap:wrap;gap:12px 22px;padding:0;margin:0}
.hero-facts li{display:flex;flex-direction:column;font-size:13px;color:var(--ink-3);padding-left:12px;border-left:2px solid var(--blue-100)}
.hero-facts b{font-size:14.5px;color:var(--ink)}
.hero-visual svg{width:100%;height:auto;border-radius:18px;box-shadow:var(--shadow-md)}

/* ---------- Section 基础 ---------- */
.section{padding:88px 0}
.section-alt{background:var(--bg-alt);border-block:1px solid var(--line)}
.sec-head{max-width:780px;margin:0 auto 44px;text-align:center}
.sec-lead{color:var(--ink-2);font-size:16px;margin-top:14px}
.grid{display:grid;gap:var(--gap)}
.grid-3{grid-template-columns:repeat(3,1fr)}

.card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:24px 22px;box-shadow:var(--shadow-sm);transition:.2s;
}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow-md);border-color:#c9dbf7}
.card h3{margin-bottom:9px}
.card p{font-size:14.5px;color:var(--ink-2);margin:0}
.ico{width:44px;height:44px;border-radius:12px;background:var(--blue-100);color:var(--blue-600);
  display:grid;place-items:center;margin-bottom:14px}
.ico svg{width:24px;height:24px}

/* ---------- 下载（端与入口） ---------- */
.entry-grid{display:grid;grid-template-columns:1fr 1fr;grid-template-rows:auto auto;gap:var(--gap)}
.entry-card{
  background:#fff;border:1px solid var(--line);border-radius:16px;padding:24px;
  box-shadow:var(--shadow-sm);display:flex;flex-direction:column;gap:10px;align-items:flex-start;
}
.entry-card:hover{border-color:#c9dbf7;box-shadow:var(--shadow-md)}
.entry-wide{grid-column:1 / -1;display:grid;grid-template-columns:1.05fr .95fr;gap:28px;align-items:center}
.entry-card h3{margin-top:6px}
.entry-card p{font-size:14px;color:var(--ink-2);margin:0}
.entry-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:14px}
.entry-url{display:flex;align-items:center;gap:8px;flex-wrap:wrap;font-size:12px;color:var(--ink-3);margin:14px 0 0 !important}
.entry-url code{background:var(--blue-50);color:var(--blue-700);border:1px solid #d7e6ff;border-radius:6px;padding:2px 8px;font-size:12px}
.entry-url code.sm{background:#f2f5fa;color:var(--ink-2);border-color:var(--line)}

.qr-wrap{position:relative;padding:10px;border:1px dashed #c9dbf7;border-radius:14px;background:var(--blue-50)}
.qr{width:168px;height:168px;border-radius:8px;background:#fff;padding:6px;box-shadow:var(--shadow-sm)}

/* 拟态截图（纯 CSS，无外部图片） */
.shot{border:1px solid var(--line);border-radius:12px;overflow:hidden;background:#fff;box-shadow:var(--shadow-sm)}
.shot-bar{display:flex;align-items:center;gap:6px;background:var(--blue-50);padding:8px 12px;border-bottom:1px solid var(--line)}
.shot-bar i{width:8px;height:8px;border-radius:50%;background:#cfdcee}
.shot-bar i:nth-child(1){background:#ffb4a8}.shot-bar i:nth-child(2){background:#ffe0a3}.shot-bar i:nth-child(3){background:#b6e3c2}
.shot-bar span{font-size:11.5px;color:var(--ink-3);margin-left:6px}
.shot-body{display:grid;grid-template-columns:74px 1fr;gap:12px;padding:12px}
.sb-side{display:flex;flex-direction:column;gap:8px}
.sb-side b{height:10px;border-radius:5px;background:var(--blue-100)}
.sb-side b:first-child{background:var(--blue-500);width:80%}
.sb-main{display:flex;flex-direction:column;gap:10px}
.sb-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.sb-cards i{height:38px;border-radius:7px;background:linear-gradient(135deg,var(--blue-100),#f2f7ff);border:1px solid #e2ecfb}
.sb-rows{display:flex;flex-direction:column;gap:6px}
.sb-rows i{height:12px;border-radius:6px;background:#eef3fa}
.sb-rows i:nth-child(odd){width:96%}
.sb-rows i:nth-child(3){width:72%}

/* ---------- CTA ---------- */
.cta{background:linear-gradient(120deg,#0b2f63 0%,#1668dc 58%,#2f80ed 100%);color:#fff;padding:62px 0}
.cta-inner{display:flex;align-items:center;justify-content:space-between;gap:32px;flex-wrap:wrap}
.cta h2{margin-bottom:10px}
.cta p{color:#d5e5ff;margin:0;font-size:15.5px;max-width:560px}
.cta-actions{display:flex;gap:12px;flex-wrap:wrap}

/* ---------- 页脚 ---------- */
.footer{background:#0c1e33;color:#c4d3e6;padding:58px 0 22px;font-size:14px}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.3fr;gap:34px}
.f-col h4{color:#fff;font-size:14.5px;margin-bottom:14px}
.f-col a{display:block;padding:5px 0;color:#a9bdd4}
.f-col a:hover{color:#fff}
.f-about p{font-size:13.5px;color:#93a9c4;margin:14px 0 6px}
.f-ph{font-size:12px;color:#6b8099}
.footer .ph{color:#8fa5c0}
.footer-bottom{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
  border-top:1px solid rgba(255,255,255,.12);margin-top:38px;padding-top:18px;font-size:12.5px;color:#8fa5c0}

/* ---------- toast ---------- */
.toast{
  position:fixed;left:50%;bottom:30px;transform:translate(-50%,20px);
  background:#0c1e33;color:#fff;font-size:14px;padding:11px 20px;border-radius:10px;
  box-shadow:var(--shadow-md);opacity:0;pointer-events:none;transition:.22s;z-index:80;
}
.toast.is-show{opacity:1;transform:translate(-50%,0)}

/* ---------- 响应式 ---------- */
@media (max-width:1080px){
  .hero-inner{grid-template-columns:1fr;gap:34px}
  .entry-wide{grid-template-columns:1fr}
}
@media (max-width:860px){
  .menu{
    position:absolute;left:0;right:0;top:68px;flex-direction:column;align-items:stretch;
    background:#fff;border-bottom:1px solid var(--line);padding:10px 16px 16px;gap:2px;
    box-shadow:var(--shadow-md);display:none;
  }
  .menu.is-open{display:flex}
  .menu a{padding:12px 10px;border-bottom:1px solid var(--line);border-radius:0}
  .burger{display:block}
  .grid-3,.entry-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr;gap:28px}
  .section{padding:62px 0}
}
@media (max-width:560px){
  .wrap{width:calc(100% - 32px)}
  .footer-grid{grid-template-columns:1fr;gap:24px}
  .nav-cta .btn{display:none}
  .hero{padding:40px 0 56px}
  .hero-actions .btn{flex:1 1 auto}
  .cta-inner{flex-direction:column;align-items:flex-start}
  .qr{width:150px;height:150px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{animation:none !important;transition:none !important}
}