/* NALTHINK Sourcing — design system
   浅色 · 极简 · 高级感：大留白、细线、克制的单强调色、无花哨动画 */
:root{
  --ink:#14181d;          /* 主文字 */
  --ink-2:#3f4750;        /* 次级文字 */
  --muted:#77828c;        /* 弱文字 */
  --line:#e8eaed;         /* 分隔线 */
  --bg:#fbfbfa;           /* 页面底（暖白） */
  --card:#ffffff;
  --accent:#ff4a1f;       /* 品牌红强调（与 favicon 一致） */
  --accent-ink:#d63a12;
  --red:#ff4a1f;          /* 品牌红（与 favicon 一致） */
  --wa:#1faa53;
  --max:1160px;
  --r:14px;
  --shadow:0 1px 2px rgba(20,24,29,.04), 0 8px 30px rgba(20,24,29,.05);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0; background:var(--bg); color:var(--ink);
  font-family:"Inter","Helvetica Neue",-apple-system,BlinkMacSystemFont,"Segoe UI",Arial,"PingFang SC","Microsoft YaHei",sans-serif;
  font-size:16.5px; line-height:1.7; -webkit-font-smoothing:antialiased;
  font-feature-settings:"kern";
}
img{max-width:100%; display:block}
a{color:inherit; text-decoration:none}
.wrap{max-width:var(--max); margin:0 auto; padding:0 28px}
h1,h2,h3{letter-spacing:-.02em; line-height:1.22; margin:0}
h1{font-weight:680}
h2{font-weight:650; font-size:clamp(26px,3.2vw,34px)}
h3{font-weight:620; font-size:17.5px}
p{margin:0 0 14px; color:var(--ink-2)}
.lede{font-size:18px; color:var(--ink-2)}
.eyebrow{font-size:12.5px; font-weight:650; letter-spacing:.14em; text-transform:uppercase; color:var(--accent); margin-bottom:14px}
.center{text-align:center}
.center .sub{margin-left:auto; margin-right:auto}

/* ---------- header ---------- */
.site-head{position:sticky; top:0; z-index:80; background:rgba(251,251,250,.88); backdrop-filter:blur(12px) saturate(150%); border-bottom:1px solid transparent; transition:border-color .2s}
.site-head.scrolled{border-bottom-color:var(--line)}
.nav{display:flex; align-items:center; justify-content:space-between; height:72px}
.brand{display:flex; align-items:baseline; gap:10px}
.brand .word{font-weight:700; letter-spacing:.04em; font-size:17px}
.brand .tag{font-size:11.5px; color:var(--muted); letter-spacing:.08em; text-transform:uppercase}
.nav-links{display:flex; align-items:center; gap:30px}
.nav-links a{font-size:14.5px; color:var(--ink-2); font-weight:520}
.nav-links a:hover{color:var(--ink)}
@media(max-width:920px){ .nav-links a:not(.keep){display:none} }

/* ---------- buttons ---------- */
.btn{display:inline-flex; align-items:center; gap:9px; padding:12px 22px; border-radius:999px;
  font-size:14.5px; font-weight:600; border:1px solid transparent; cursor:pointer; transition:all .18s ease}
.btn-dark{background:var(--red, #ff4a1f); color:#fff}
.btn-dark:hover{background:#e63d12; transform:translateY(-1px)}
.btn-line{border-color:var(--line); background:#fff; color:var(--ink)}
.btn-line:hover{border-color:#cfd4d9}
.btn-wa{background:#fff; color:#128c4b; border:1.5px solid #bfe3cf}
.btn-wa:hover{background:#f0faf4; border-color:#128c4b; transform:translateY(-1px)}
.btn-sm{padding:9px 16px; font-size:13.5px}

/* ---------- hero ---------- */
.hero{padding:88px 0 0}
.hero-grid{display:grid; grid-template-columns:1.05fr .95fr; gap:64px; align-items:center}
.hero h1{font-size:clamp(36px,4.6vw,54px); margin-bottom:22px}
.hero .lede{max-width:30pc; margin-bottom:30px}
.hero-actions{display:flex; gap:12px; flex-wrap:wrap}
.hero-media{position:relative}
.hero-media img{border-radius:18px; box-shadow:var(--shadow); aspect-ratio:4/3.1; object-fit:cover}
.hero-media .chip{position:absolute; left:18px; bottom:18px; background:rgba(255,255,255,.92); backdrop-filter:blur(6px);
  border-radius:12px; padding:10px 16px; font-size:13px; color:var(--ink-2); box-shadow:var(--shadow)}
.hero-media .chip b{color:var(--ink)}
@media(max-width:960px){ .hero-grid{grid-template-columns:1fr; gap:40px} .hero{padding-top:56px} }

/* trust chips row */
.trust{display:flex; gap:26px; flex-wrap:wrap; margin-top:34px; padding-top:26px; border-top:1px solid var(--line)}
.trust span{font-size:13.5px; color:var(--muted); display:flex; align-items:center; gap:8px}
.trust b{color:var(--ink); font-weight:650}
.trust .tick{color:var(--accent); font-weight:700}

/* ---------- stats band ---------- */
.band{margin-top:80px; border-top:1px solid var(--line); border-bottom:1px solid var(--line); background:#fff}
.band-in{display:grid; grid-template-columns:repeat(4,1fr)}
.band-in > div{padding:30px 26px; border-right:1px solid var(--line)}
.band-in > div:last-child{border-right:0}
.band-in b{display:block; font-size:30px; font-weight:680; letter-spacing:-.02em}
.band-in span{font-size:13px; color:var(--muted)}
@media(max-width:820px){ .band-in{grid-template-columns:repeat(2,1fr)} .band-in > div:nth-child(2){border-right:0} }

/* ---------- sections ---------- */
section{padding:88px 0}
section.tight{padding:64px 0}
.sub{color:var(--muted); max-width:62ch; margin-bottom:44px; font-size:16.5px}
.center .sub{margin-left:auto; margin-right:auto}

/* cards */
.grid-3{display:grid; grid-template-columns:repeat(3,1fr); gap:22px}
.grid-2{display:grid; grid-template-columns:repeat(2,1fr); gap:22px}
@media(max-width:920px){ .grid-3,.grid-2{grid-template-columns:1fr} }
.card{background:var(--card); border:1px solid var(--line); border-radius:var(--r); padding:32px; transition:transform .18s ease, box-shadow .18s ease}
.card:hover{transform:translateY(-2px); box-shadow:var(--shadow)}
.card .no{font-size:12.5px; color:var(--muted); letter-spacing:.1em; margin-bottom:16px; display:block}
.card p{font-size:15px}
.card ul{margin:14px 0 0; padding:0; list-style:none}
.card li{font-size:14.5px; color:var(--ink-2); padding:7px 0 7px 24px; position:relative; border-top:1px dashed var(--line)}
.card li:first-child{border-top:0}
.card li::before{content:"—"; position:absolute; left:0; color:var(--accent); font-weight:600}

/* industry media cards */
.media-card{border-radius:var(--r); overflow:hidden; background:#fff; border:1px solid var(--line)}
.media-card img{aspect-ratio:4/3; object-fit:cover; width:100%}
.media-card .mc-body{padding:24px 26px 28px}
.media-card p{font-size:14.5px; margin-bottom:0}

/* steps */
.steps{display:grid; grid-template-columns:repeat(4,1fr); gap:0; border:1px solid var(--line); border-radius:var(--r); background:#fff; overflow:hidden}
.step{padding:30px 28px 34px; border-right:1px solid var(--line); position:relative}
.step:last-child{border-right:0}
.step .n{font-size:13px; color:var(--accent); font-weight:700; letter-spacing:.1em; margin-bottom:14px}
.step p{font-size:14.5px; margin:0}
@media(max-width:920px){ .steps{grid-template-columns:1fr 1fr} .step:nth-child(2){border-right:0} }
@media(max-width:560px){ .steps{grid-template-columns:1fr} .step{border-right:0; border-bottom:1px solid var(--line)} .step:last-child{border-bottom:0} }

/* split rows */
.split{display:grid; grid-template-columns:1fr 1fr; gap:64px; align-items:center}
.split img{border-radius:var(--r); box-shadow:var(--shadow); aspect-ratio:4/3; object-fit:cover}
.split.rev .split-media{order:2}
@media(max-width:920px){ .split{grid-template-columns:1fr; gap:32px} .split.rev .split-media{order:0} }
.checklist{margin:22px 0 0; padding:0; list-style:none}
.checklist li{padding:10px 0 10px 30px; position:relative; font-size:15.5px; color:var(--ink-2); border-top:1px solid var(--line)}
.checklist li:first-child{border-top:0}
.checklist li::before{content:"✓"; position:absolute; left:2px; color:var(--accent); font-weight:700}

/* price table */
.price-wrap{border:1px solid var(--line); border-radius:var(--r); background:#fff; overflow:hidden}
table.price{width:100%; border-collapse:collapse; font-size:15px}
.price th{text-align:left; font-size:12px; letter-spacing:.12em; text-transform:uppercase; color:var(--muted);
  font-weight:650; padding:16px 26px; background:#fafaf9; border-bottom:1px solid var(--line)}
.price td{padding:18px 26px; border-bottom:1px solid var(--line); vertical-align:top; color:var(--ink-2)}
.price tr:last-child td{border-bottom:0}
.price td b{color:var(--ink); font-weight:650}
@media(max-width:760px){ .price .hide-sm{display:none} }

/* quote form */
.quote{background:#fff; border:1px solid var(--line); border-radius:18px; padding:44px; box-shadow:var(--shadow)}
.qgrid{display:grid; grid-template-columns:1fr 1fr; gap:18px}
.qfield{display:flex; flex-direction:column; gap:7px}
.qfield.full{grid-column:1/-1}
.qfield label{font-size:13px; font-weight:600; color:var(--ink-2)}
.qfield input,.qfield textarea{border:1px solid var(--line); border-radius:10px; padding:13px 15px; font:inherit; font-size:15px; background:var(--bg); transition:border-color .15s}
.qfield input:focus,.qfield textarea:focus{outline:none; border-color:var(--accent)}
.qfield textarea{min-height:110px; resize:vertical}
.qnote{font-size:13px; color:var(--muted); margin-top:12px}
@media(max-width:720px){ .qgrid{grid-template-columns:1fr} .quote{padding:28px} }

/* FAQ accordion */
.faq-list{border-top:1px solid var(--line)}
.faq-item{border-bottom:1px solid var(--line)}
.faq-item button{all:unset; display:flex; justify-content:space-between; align-items:center; width:100%;
  cursor:pointer; padding:22px 4px; font-size:16.5px; font-weight:600; color:var(--ink)}
.faq-item button::after{content:"+"; font-size:22px; color:var(--muted); font-weight:400; transition:transform .2s}
.faq-item.open button::after{transform:rotate(45deg)}
.faq-item .a{max-height:0; overflow:hidden; transition:max-height .25s ease}
.faq-item .a p{font-size:15px; color:var(--ink-2); padding:0 4px 22px; max-width:70ch; margin:0}

/* notice */
.notice{border:1px solid var(--line); border-left:3px solid var(--accent); background:#fff; border-radius:0 12px 12px 0;
  padding:20px 24px; font-size:14.5px; color:var(--ink-2); margin-top:36px}
.notice b{color:var(--ink)}

/* CTA band */
.cta-band{background:var(--ink); border-radius:20px; color:#fff; padding:56px; display:flex; align-items:center; justify-content:space-between; gap:30px; flex-wrap:wrap}
.cta-band h2{color:#fff; font-size:clamp(24px,3vw,32px); margin-bottom:8px}
.cta-band p{color:#aab4bd; margin:0; font-size:15.5px}
.cta-band .btn-wa{box-shadow:none}

/* footer */
footer.site{border-top:1px solid var(--line); background:#fff; padding:56px 0 36px; margin-top:40px}
.fgrid{display:grid; grid-template-columns:2fr 1fr 1fr 1fr; gap:40px; margin-bottom:36px}
@media(max-width:860px){ .fgrid{grid-template-columns:1fr 1fr} }
.fgrid h4{font-size:12.5px; letter-spacing:.1em; text-transform:uppercase; color:var(--muted); margin:0 0 14px; font-weight:650}
.fgrid a{display:block; font-size:14px; color:var(--ink-2); padding:5px 0}
.fgrid a:hover{color:var(--ink)}
.fgrid p{font-size:14px; color:var(--muted); max-width:36ch}
.fbottom{border-top:1px solid var(--line); padding-top:22px; display:flex; justify-content:space-between; gap:14px; flex-wrap:wrap; font-size:13px; color:var(--muted)}

/* WhatsApp float */
.wa-float{position:fixed; right:24px; bottom:24px; z-index:90; width:56px; height:56px; border-radius:50%;
  background:var(--wa); color:#fff; display:grid; place-items:center; box-shadow:0 10px 26px rgba(31,170,83,.35); font-size:22px}
.wa-float:hover{background:#189347; transform:translateY(-2px)}

/* forms ok/err */
.form-msg{font-size:14px; margin-top:14px; display:none}
.form-msg.ok{display:block; color:#1a7f42}
.form-msg.err{display:block; color:#b3372f}

/* inner page head */
.page-head{padding:72px 0 0}
.page-head h1{font-size:clamp(32px,4vw,44px); margin-bottom:16px}

/* doc pages */
.doc{padding:56px 0 40px; max-width:800px}
.doc h2{font-size:21px; margin:36px 0 12px}
.doc p,.doc li{font-size:15.5px}
.doc ul{padding-left:22px}
.doc li{margin-bottom:8px}
.doc .meta{color:var(--muted); font-size:14px; margin-bottom:30px}

/* ==========================================================================
   2026-10-28 二轮丰富：全类目马赛克 · 客户反馈 · 图集 · 留资页 · 彩色化
   ========================================================================== */

/* hero 微渐变底，打破纯白 */
.hero{position:relative; overflow:hidden}
.hero::before{content:""; position:absolute; inset:0; pointer-events:none;
  background:
    radial-gradient(700px 340px at 88% -10%, rgba(18,80,126,.09), transparent 62%),
    radial-gradient(560px 300px at -8% 110%, rgba(214,120,42,.07), transparent 60%);}

/* ---------- 全类目马赛克 ---------- */
.mosaic{display:grid; grid-template-columns:repeat(4,1fr); grid-auto-rows:190px; gap:14px}
.mosaic .m{position:relative; border-radius:var(--r); overflow:hidden; background:#dfe3e7; cursor:default}
.mosaic .m.w2{grid-column:span 2}
.mosaic .m img{position:absolute; inset:0; width:100%; height:100%; object-fit:cover; transition:transform .5s ease}
.mosaic .m:hover img{transform:scale(1.045)}
.mosaic .m::after{content:""; position:absolute; inset:0;
  background:linear-gradient(180deg, rgba(10,14,18,0) 34%, rgba(10,14,18,.72) 100%)}
.mosaic .m .cap{position:absolute; left:16px; right:16px; bottom:13px; z-index:2; color:#fff}
.mosaic .m .cap h3{color:#fff; font-size:16px; margin-bottom:2px}
.mosaic .m .cap span{font-size:12.5px; color:rgba(255,255,255,.78); line-height:1.45; display:block}
.mosaic .m .cap .more{position:absolute; right:0; bottom:0; font-size:12px; opacity:0; transition:opacity .25s}
.mosaic .m:hover .cap .more{opacity:.9}
@media(max-width:960px){ .mosaic{grid-template-columns:repeat(2,1fr); grid-auto-rows:170px} }
@media(max-width:560px){ .mosaic{grid-template-columns:1fr; grid-auto-rows:180px} .mosaic .m.w2{grid-column:span 1} }

/* ---------- 品类标签墙 ---------- */
.chipwall{display:flex; flex-wrap:wrap; gap:9px; margin-top:30px}
.chipwall span{font-size:13.5px; color:var(--ink-2); background:#fff; border:1px solid var(--line);
  border-radius:999px; padding:7px 15px; transition:all .15s}
.chipwall span:hover{border-color:var(--accent); color:var(--accent); transform:translateY(-1px)}

/* ---------- 客户反馈 ---------- */
.testis{display:grid; grid-template-columns:repeat(3,1fr); gap:20px}
@media(max-width:920px){ .testis{grid-template-columns:1fr} }
.testi{background:#fff; border:1px solid var(--line); border-radius:var(--r); padding:28px;
  display:flex; flex-direction:column; gap:16px; transition:transform .18s, box-shadow .18s}
.testi:hover{transform:translateY(-2px); box-shadow:var(--shadow)}
.testi .stars{color:#e8930c; letter-spacing:2.5px; font-size:14px}
.testi p{font-size:15px; color:var(--ink-2); margin:0; flex:1}
.testi .who{display:flex; align-items:center; gap:12px; border-top:1px solid var(--line); padding-top:15px}
.testi .av{width:40px; height:40px; border-radius:50%; display:grid; place-items:center;
  font-size:14px; font-weight:700; color:#fff; flex:none}
.testi .who b{display:block; font-size:14px; color:var(--ink); font-weight:620}
.testi .who span{font-size:12.5px; color:var(--muted)}
.av.c1{background:#12507e} .av.c2{background:#0e7c66} .av.c3{background:#b3541e}
.av.c4{background:#5b4a9e} .av.c5{background:#a0392f} .av.c6{background:#20718a}

/* ---------- 图集长条 ---------- */
.gallery{display:grid; grid-template-columns:repeat(4,1fr); gap:14px}
@media(max-width:920px){ .gallery{grid-template-columns:repeat(2,1fr)} }
.gallery .g{border-radius:var(--r); overflow:hidden; position:relative; aspect-ratio:4/3; background:#e5e8eb}
.gallery .g img{width:100%; height:100%; object-fit:cover; transition:transform .5s}
.gallery .g:hover img{transform:scale(1.05)}
.gallery .g .gcap{position:absolute; left:0; right:0; bottom:0; padding:26px 14px 10px;
  background:linear-gradient(180deg, transparent, rgba(10,14,18,.65)); color:#fff; font-size:12.5px}

/* ---------- 服务卡配色 ---------- */
.card .no{display:inline-block; background:#fff0eb; color:var(--accent); border-radius:8px;
  padding:3px 10px; font-weight:700}
.card{border-top:3px solid transparent}
.card:hover{border-top-color:var(--accent)}

/* ---------- 大数字卡 ---------- */
.stat-cards{display:grid; grid-template-columns:repeat(4,1fr); gap:16px}
@media(max-width:820px){ .stat-cards{grid-template-columns:repeat(2,1fr)} }
.stat-card{background:#fff; border:1px solid var(--line); border-radius:var(--r); padding:26px;
  position:relative; overflow:hidden}
.stat-card::before{content:""; position:absolute; left:0; top:0; bottom:0; width:4px; background:var(--sc,#12507e)}
.stat-card b{display:block; font-size:34px; font-weight:700; letter-spacing:-.02em; color:var(--ink)}
.stat-card span{font-size:13.5px; color:var(--muted); line-height:1.5; display:block; margin-top:4px}

/* ---------- split 双图 ---------- */
.split-media{display:grid; gap:14px}
.split-media.two{grid-template-columns:1fr 1fr}
.split-media img{border-radius:var(--r); box-shadow:var(--shadow); aspect-ratio:4/3.2; object-fit:cover; width:100%}

/* ---------- 留资页专用 ---------- */
.inq-wrap{display:grid; grid-template-columns:1.15fr .85fr; gap:44px; align-items:start; padding:56px 0 72px}
@media(max-width:920px){ .inq-wrap{grid-template-columns:1fr} }
.inq-side{position:sticky; top:96px}
.inq-side .side-card{background:#fff; border:1px solid var(--line); border-radius:var(--r); padding:26px; margin-bottom:16px}
.inq-side .side-card h3{margin-bottom:10px}
.inq-side .side-card p{font-size:14.5px; margin:0}
.inq-side .side-card .sn{font-size:12.5px; font-weight:700; color:var(--accent); display:block; margin-bottom:6px; letter-spacing:.06em}
.cat-chips{display:flex; flex-wrap:wrap; gap:9px}
.cat-chips input{position:absolute; opacity:0; pointer-events:none}
.cat-chips label{font-size:13.5px; padding:8px 16px; border:1px solid var(--line); border-radius:999px;
  cursor:pointer; background:#fff; color:var(--ink-2); transition:all .14s; user-select:none}
.cat-chips label:hover{border-color:#c6d3de}
.cat-chips input:checked + label{background:var(--accent); border-color:var(--accent); color:#fff}
.inq-form{background:#fff; border:1px solid var(--line); border-radius:18px; padding:40px; box-shadow:var(--shadow)}
.inq-form .qgrid3{display:grid; grid-template-columns:repeat(3,1fr); gap:16px}
@media(max-width:760px){ .inq-form .qgrid3{grid-template-columns:1fr} .inq-form{padding:26px} }
.inq-form label.f{font-size:12.5px; font-weight:650; color:var(--muted); text-transform:uppercase; letter-spacing:.08em; margin-bottom:6px; display:block}

/* ---------- 深色证据块 ---------- */
.dark-band{background:#10151b; border-radius:22px; color:#fff; padding:64px; margin:8px 0}
.dark-band h2{color:#fff}
.dark-band p{color:#a7b1ba}
.dark-band .checklist li{color:#c3ccd3; border-color:#242c35}
.dark-band .checklist li::before{color:#5aa9e6}
@media(max-width:760px){ .dark-band{padding:34px 24px} }

/* ---------- hero 动态海浪背景（2026-10-29） ---------- */
.hero-video{position:absolute; inset:0; width:100%; height:100%; object-fit:cover; z-index:0; opacity:.85; filter:saturate(1.25)}
.hero-veil{position:absolute; inset:0; z-index:0;
  background:linear-gradient(180deg, rgba(248,250,252,.88) 0%, rgba(240,246,251,.42) 55%, rgba(251,251,250,.95) 100%)}
.hero > .wrap{position:relative; z-index:1}
@media(max-width:860px){ .hero-video{display:none} .hero-veil{display:none} }

/* 图集 8 格时保持节奏 */
.gallery .g:nth-child(8){grid-column:auto}

/* ==========================================================================
   2026-10-29 三轮：logo红底 · 加号链接 · 深色带改品牌红 · hero单栏
   ========================================================================== */

/* nav logo 红底白字 */
.brand-box{background:linear-gradient(135deg,#ff4a1f,#e63d12); border-radius:10px; padding:8px 16px}
.brand-box .word{color:#fff}
.brand-box .tag{color:rgba(255,255,255,.85)}

/* hero 单栏（右图已删） */
.hero-grid{grid-template-columns:1fr; max-width:860px}
.hero .lede{max-width:56ch}

/* "+ whatever you ask next" 变链接 */
.chipwall a{font-size:13.5px; color:var(--accent); background:#fff; border:1px dashed var(--accent);
  border-radius:999px; padding:7px 15px; text-decoration:none; transition:all .15s}
.chipwall a:hover{background:var(--accent); color:#fff; transform:translateY(-1px)}

/* 深色带 → 品牌红渐变 */
.dark-band{background:linear-gradient(135deg,#ff4a1f,#d93a10); color:#fff}
.dark-band h2{color:#fff}
.dark-band p{color:rgba(255,255,255,.88)}
.dark-band .eyebrow{color:rgba(255,255,255,.85) !important}
.dark-band .checklist li{color:rgba(255,255,255,.94); border-color:rgba(255,255,255,.25)}
.dark-band .checklist li::before{color:#fff}
.dark-band .checklist li b{color:#fff}

/* CTA 深色带 → 品牌红渐变 */
.cta-band{background:linear-gradient(135deg,#ff4a1f,#d93a10)}
.cta-band p{color:rgba(255,255,255,.88)}
.cta-band .btn-line{background:#fff; color:var(--accent); border-color:#fff}
.cta-band .btn-line:hover{background:#fff4f0}
.cta-band .btn-wa{background:transparent; border-color:rgba(255,255,255,.6); color:#fff}
.cta-band .btn-wa:hover{background:rgba(255,255,255,.12)}

/* 页脚邮箱点击复制提示 */
.copy-toast{position:fixed; left:50%; bottom:34px; transform:translateX(-50%) translateY(8px);
  background:#10151b; color:#fff; font-size:13.5px; padding:10px 20px; border-radius:999px;
  opacity:0; pointer-events:none; transition:all .25s; z-index:9999}
.copy-toast.show{opacity:1; transform:translateX(-50%) translateY(0)}