/* ============================================================
   天达时环保 · 全站样式表
   设计规范见 07-设计规范-大气去AI味.md
   原则：1 个强调色 / 无渐变 / 无 emoji / 大字重 / 硬分割线
   ============================================================ */

:root{
  --ink:#101f26;      /* 深墨 */
  --ink2:#1a333c;     /* 深墨浅一档 */
  --accent:#c4562a;   /* 工业橙（唯一强调色） */
  --green:#17423b;    /* 深绿（环保属性） */
  --paper:#f2f0ec;    /* 暖白底 */
  --paper2:#eae6df;   /* 暖白 hover */
  --line:#d6d1c7;     /* 分割线 */
  --muted:#6b7880;
  --text:#3d4a51;
  --white:#e8e4dc;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  background:var(--paper);color:var(--text);font-size:16px;line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.wrap{max-width:1240px;margin:0 auto;padding:0 28px}
.mono{font-variant-numeric:tabular-nums;font-feature-settings:"tnum"}

/* ---------- 首屏 ---------- */
.hero{background:var(--ink);color:var(--white);padding:76px 0 68px;position:relative;overflow:hidden}
.hero::before{content:"";position:absolute;inset:0;
  background-image:linear-gradient(rgba(255,255,255,.035) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(255,255,255,.035) 1px,transparent 1px);
  background-size:64px 64px;pointer-events:none}
.hero .wrap{position:relative;display:grid;grid-template-columns:1.35fr .95fr;gap:64px;align-items:start}
.hero h1{font-size:clamp(34px,4.6vw,54px);font-weight:900;line-height:1.2;letter-spacing:-.02em;color:#fff;margin-bottom:22px}
.hero h1 span{color:var(--accent)}
.hero .lead{font-size:16.5px;color:#a9b8bd;max-width:620px;margin-bottom:34px;line-height:1.8}
.hero .lead b{color:var(--white);font-weight:600}
.hero-btns{display:flex;gap:14px;flex-wrap:wrap}
.hero-stats{border-left:1px solid rgba(255,255,255,.16)}
.stat{padding:20px 0 20px 28px;border-bottom:1px solid rgba(255,255,255,.11)}
.stat:last-child{border-bottom:0}
.stat .n{font-size:30px;font-weight:900;color:#fff;line-height:1.15;letter-spacing:-.02em}
.stat .n em{font-style:normal;color:var(--accent);font-size:17px;font-weight:700;margin-left:4px}
.stat .t{font-size:13.5px;color:#8fa1a7;margin-top:4px}
@media(max-width:900px){
  .hero .wrap{grid-template-columns:1fr;gap:38px}
  .hero{padding:52px 0 46px}
  .hero-stats{border-left:0;border-top:1px solid rgba(255,255,255,.16);padding-top:8px}
  .stat{padding-left:0}
  .stat .n{font-size:25px}
}

/* ---------- 顶部信息条 ---------- */
.topbar{background:var(--ink);color:#9fb0b6;font-size:13px;letter-spacing:.02em}
.topbar .wrap{display:flex;justify-content:space-between;align-items:center;height:38px;gap:20px}
.topbar b{color:var(--white);font-weight:600}
.topbar .tb-r{display:flex;gap:26px}
@media(max-width:820px){.topbar .tb-r span:nth-child(1){display:none}}

/* ---------- 导航 ---------- */
header{background:var(--paper);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:60}
.nav{display:flex;align-items:center;justify-content:space-between;height:76px}
.brand{display:flex;align-items:baseline;gap:10px}
.brand .cn{font-size:21px;font-weight:900;color:var(--ink);letter-spacing:-.01em}
.brand .en{font-size:11.5px;color:var(--muted);letter-spacing:.14em;text-transform:uppercase}
.navlinks{display:flex;gap:34px;font-size:15.5px;font-weight:600;color:var(--ink2)}
.navlinks a{padding:6px 0;border-bottom:2px solid transparent}
.navlinks a:hover{border-color:var(--accent)}
.cta{background:var(--accent);color:#fff;padding:12px 22px;font-weight:700;font-size:15px}
.cta:hover{background:#a9451f}
@media(max-width:900px){
  .navlinks{display:none}
  .nav{height:64px}
  .brand .en{display:none}
  .brand .cn{font-size:19px;white-space:nowrap}
  .cta{padding:10px 15px;font-size:13.5px;white-space:nowrap}
  .topbar .wrap{height:auto;padding-top:7px;padding-bottom:7px;font-size:12px}
  .topbar .tb-r span{white-space:nowrap}
}

/* ---------- 面包屑 ---------- */
.bc{background:#e9e5de;border-bottom:1px solid var(--line);font-size:13.5px;color:var(--muted)}
.bc .wrap{padding:13px 28px}
.bc a:hover{color:var(--accent)}
.bc b{color:var(--ink);font-weight:700}

/* ---------- 区块 ---------- */
section{padding:76px 0}
.sec-head{display:flex;align-items:flex-end;justify-content:space-between;gap:30px;margin-bottom:46px;
  border-bottom:2px solid var(--ink);padding-bottom:16px}
.sec-head h2{font-size:clamp(24px,2.6vw,32px);font-weight:900;color:var(--ink);letter-spacing:-.015em;line-height:1.25}
.sec-head .note{font-size:13.5px;color:var(--muted);letter-spacing:.06em;text-transform:uppercase;white-space:nowrap}
@media(max-width:760px){section{padding:52px 0}
  .sec-head{flex-direction:column;align-items:flex-start;gap:8px;margin-bottom:32px}}

/* ---------- 深色区块 ---------- */
.dark{background:var(--ink2);color:#dfe6e8}
.dark .sec-head{border-color:rgba(255,255,255,.25)}
.dark .sec-head h2{color:#fff}
.dark .sec-head .note{color:#8fa1a7}
.dark p,.dark li{color:#a9b8bd}

/* ---------- 正文排版 ---------- */
.prose{max-width:900px}
.prose p{margin-bottom:18px;font-size:16px;line-height:1.9}
.prose p:last-child{margin-bottom:0}
.prose b{color:var(--ink);font-weight:700}
.dark .prose b{color:#fff}
.leadp{font-size:17px;line-height:1.9;color:var(--text)}

/* 编号列表（替代小圆点，更像工程文档） */
.numlist{list-style:none;counter-reset:nl;display:block;border-top:1px solid var(--line)}
.numlist li{counter-increment:nl;position:relative;display:block;
  padding:20px 4px 20px 62px;border-bottom:1px solid var(--line);font-size:15.5px;line-height:1.85}
.numlist li::before{content:counter(nl,decimal-leading-zero);position:absolute;left:4px;top:20px;
  font-weight:800;color:var(--accent);font-size:14px;letter-spacing:.04em}
.numlist li b{color:var(--ink)}
.dark .numlist{border-color:rgba(255,255,255,.18)}
.dark .numlist li{border-color:rgba(255,255,255,.12)}
.dark .numlist li b{color:#fff}

/* ---------- 表格 ---------- */
.tblwrap{overflow-x:auto;border:1px solid var(--line);background:#faf9f6}
table.tbl{width:100%;border-collapse:collapse;font-size:14.5px;min-width:660px}
table.tbl th{background:var(--ink);color:#fff;font-weight:700;text-align:left;padding:14px 16px;
  white-space:nowrap;font-size:14px;letter-spacing:.02em}
table.tbl td{padding:14px 16px;border-bottom:1px solid var(--line);vertical-align:top;line-height:1.75}
table.tbl tr:nth-child(even) td{background:#f4f2ee}
table.tbl tr:last-child td{border-bottom:0}
table.tbl td:first-child{font-weight:700;color:var(--ink);white-space:nowrap}
.tblnote{font-size:13px;color:var(--muted);margin-top:12px;line-height:1.8}

/* ---------- 产品条带（首页/列表用） ---------- */
.plist{border-top:1px solid var(--line)}
.prow{display:grid;grid-template-columns:76px 1.05fr 1.5fr 210px;gap:28px;align-items:center;
  padding:30px 8px;border-bottom:1px solid var(--line);transition:background .18s}
.prow:hover{background:var(--paper2)}
.prow .no{font-size:15px;font-weight:800;color:var(--accent);letter-spacing:.06em}
.prow h3{font-size:21px;font-weight:800;color:var(--ink);line-height:1.35}
.prow h3 small{display:block;font-size:12.5px;font-weight:500;color:var(--muted);letter-spacing:.04em;margin-top:3px}
.prow .spec{font-size:14.5px;line-height:1.85}
.prow .spec b{color:var(--ink);font-weight:600}
.prow .go{font-size:14px;font-weight:700;text-align:right;white-space:nowrap}
.prow:hover .go{color:var(--accent)}
@media(max-width:900px){.prow{grid-template-columns:1fr;gap:10px;padding:24px 4px}.prow .go{text-align:left}}

/* ---------- 三列能力格 ---------- */
.capgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;
  background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.14)}
.capcell{background:var(--ink2);padding:34px 30px}
.capcell h4{font-size:18px;font-weight:800;color:#fff;margin-bottom:12px}
.capcell p{font-size:14.5px;line-height:1.85}
.capcell .k{display:block;font-size:12px;letter-spacing:.12em;color:var(--accent);font-weight:700;
  margin-bottom:14px;text-transform:uppercase}
@media(max-width:900px){.capgrid{grid-template-columns:1fr}}

/* ---------- 流程条 ---------- */
.flow{display:grid;grid-template-columns:repeat(5,1fr);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.fstep{padding:26px 20px;border-right:1px solid var(--line)}
.fstep:last-child{border-right:0}
.fstep .fn{font-size:12px;font-weight:800;color:var(--accent);letter-spacing:.14em}
.fstep b{display:block;font-size:16.5px;font-weight:800;color:var(--ink);margin:10px 0 6px}
.fstep span{font-size:13.5px;color:var(--muted);line-height:1.7}
@media(max-width:900px){.flow{grid-template-columns:1fr 1fr}.fstep{border-bottom:1px solid var(--line)}}

/* ---------- 服务地区 ---------- */
.areablock{background:var(--green);color:#dfe8e5}
.areablock .sec-head{border-color:rgba(255,255,255,.28)}
.areablock .sec-head h2{color:#fff}
.areablock .sec-head .note{color:#9db5ae}
.citygrid{display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid rgba(255,255,255,.2)}
.citygrid div{padding:18px 6px 18px 0;border-bottom:1px solid rgba(255,255,255,.14);font-size:16px;color:#e7efec}
.citygrid div b{font-weight:800;color:#fff;margin-right:10px}
.citygrid div span{font-size:12.5px;color:#9db5ae}
@media(max-width:760px){.citygrid{grid-template-columns:1fr 1fr}}

/* ---------- FAQ ---------- */
.faq{border-top:1px solid var(--line)}
.faq details{border-bottom:1px solid var(--line)}
.faq summary{padding:22px 40px 22px 0;font-size:17px;font-weight:700;color:var(--ink);
  cursor:pointer;position:relative;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:6px;top:50%;transform:translateY(-50%);
  font-size:22px;font-weight:400;color:var(--accent);line-height:1}
.faq details[open] summary::after{content:"–"}
.faq details p{padding:0 0 24px;font-size:15.5px;line-height:1.9;max-width:900px}

/* ---------- 联系 ---------- */
.contact{background:var(--ink);color:var(--white)}
.contact .wrap{display:grid;grid-template-columns:1.2fr .8fr;gap:60px;align-items:center}
.contact h2{font-size:clamp(26px,3vw,38px);font-weight:900;color:#fff;line-height:1.28;
  letter-spacing:-.02em;margin-bottom:16px}
.contact p{color:#a9b8bd;font-size:15.5px;margin-bottom:26px}
.phonebox{border-left:2px solid var(--accent);padding-left:26px}
.phonebox .lbl{font-size:12.5px;letter-spacing:.16em;color:var(--accent);font-weight:700;margin-bottom:8px}
.phonebox .num{font-size:clamp(26px,3.2vw,38px);font-weight:900;color:#fff}
.phonebox .sub{font-size:13.5px;color:#8fa1a7;margin-top:10px;line-height:1.8}
@media(max-width:900px){.contact .wrap{grid-template-columns:1fr;gap:34px}}

/* ---------- 按钮 ---------- */
.btn{display:inline-block;padding:15px 30px;font-weight:700;font-size:15.5px}
.btn-solid{background:#fff;color:var(--ink)}
.btn-accent{background:var(--accent);color:#fff}
.btn-accent:hover{background:#a9451f}
.btn-ghost{border:1px solid rgba(255,255,255,.32);color:var(--white)}
.btn-ghost:hover{border-color:#fff}
.btn-line{border:2px solid var(--ink);color:var(--ink)}

/* ---------- 页脚 ---------- */
footer{background:#0a151a;color:#7d8b91;font-size:13px;padding:30px 0}
footer .wrap{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}
footer b{color:#a9b8bd;font-weight:600}

/* ---------- 深色区块内的信息表 ---------- */
.dark-tbl table.tbl td{background:#122530;color:#c2ced2;border-bottom-color:rgba(255,255,255,.12)}
.dark-tbl table.tbl tr:nth-child(even) td{background:#173039}
.dark-tbl table.tbl td:first-child{color:#fff;border-right:1px solid rgba(255,255,255,.09)}

/* ---------- 手机端：宽表改成卡片式堆叠（避免左右拖） ---------- */
@media(max-width:700px){
  .tblwrap{overflow-x:visible}
  table.tbl{min-width:0 !important;font-size:13.5px}
  table.tbl thead{display:none}
  table.tbl tr{display:block;border-bottom:2px solid var(--line);padding:8px 0}
  table.tbl tr:last-child{border-bottom:0}
  table.tbl td{display:block;border:0;padding:3px 14px;background:none;line-height:1.7}
  table.tbl tr:nth-child(even) td{background:none}
  table.tbl td:first-child{font-size:12.5px;letter-spacing:.05em;color:var(--muted);white-space:normal}
  .dark-tbl table.tbl tr{border-bottom-color:rgba(255,255,255,.14)}
  .dark-tbl table.tbl td, .dark-tbl table.tbl tr:nth-child(even) td{background:none}
  .dark-tbl table.tbl td:first-child{color:#9db5ae;border-right:0}
  .dark-tbl{padding:6px 0 10px}
}

/* ---------- 证书图版（资质页） ---------- */
.certgrid{display:grid;gap:18px;align-items:start}
.certgrid.c2{grid-template-columns:repeat(2,1fr)}
.certgrid.c3{grid-template-columns:repeat(3,1fr)}
.certgrid.c4{grid-template-columns:repeat(4,1fr)}
.certgrid figure{border:1px solid var(--line);background:#fff;display:flex;flex-direction:column}
.certgrid a.zoom{display:block;position:relative;background:#fff}
.certgrid img{width:100%;height:auto;background:#fff}
.certgrid a.zoom::after{content:"点击看大图";position:absolute;right:0;bottom:0;
  background:rgba(16,31,38,.72);color:#fff;font-size:11.5px;padding:3px 9px;letter-spacing:.02em}
.certgrid figcaption{padding:13px 15px;border-top:1px solid var(--line);font-size:13px;line-height:1.7;color:var(--text)}
.certgrid figcaption b{display:block;font-size:14.5px;font-weight:800;color:var(--ink);margin-bottom:5px;line-height:1.45}
.certgrid figcaption span{color:var(--muted);font-size:12.5px}
@media(max-width:1100px){.certgrid.c4{grid-template-columns:repeat(3,1fr)}}
@media(max-width:900px){.certgrid.c3,.certgrid.c4{grid-template-columns:1fr 1fr}}
@media(max-width:760px){.certgrid.c2{grid-template-columns:1fr}
  .certgrid figcaption{padding:11px 13px;font-size:12.5px}
  .certgrid figcaption b{font-size:13.5px}
  .certgrid a.zoom::after{font-size:10.5px;padding:2px 7px}}
.certgrid.c3,.certgrid.c4{gap:14px}
.docmore{border:1px solid var(--line);background:#faf9f6;padding:4px 20px 20px;margin-top:22px}
.docmore summary{cursor:pointer;font-weight:800;color:var(--ink);padding:16px 0;font-size:15.5px;list-style:none}
.docmore summary::-webkit-details-marker{display:none}
.docmore summary::after{content:"＋";float:right;color:var(--accent);font-weight:400}
.docmore details[open] summary::after{content:"－"}