/* 龙虎斗官网 - longhudou-apps.com.cn - Industrial Resource Intelligence visual system */
:root{
  --bg:#f3f5f7;--bg-2:#e9edf1;--paper:#ffffff;--ink:#1b2430;--ink-2:#3d4a58;--muted:#6b7784;--line:#d6dde5;
  --graphite:#1c2128;--graphite-2:#242b34;--slate:#2b3a4a;
  --waste:#0f6b5f;--waste-soft:#d9efe9;--water:#1a7fa3;--water-soft:#d8ecf4;--sort:#4c4fb8;--sort-soft:#e2e2f6;
  --leak:#d9782c;--leak-soft:#fbe8d8;--warn:#dfa722;--warn-soft:#fbf1d2;--ww:#145c6b;--ww-soft:#d5e7ea;
  --radius:14px;--shadow:0 6px 24px rgba(27,36,48,.08);--maxw:1180px;
  font-family:"PingFang SC","Microsoft YaHei","Noto Sans SC","Helvetica Neue",Arial,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);line-height:1.8;font-size:16px;overflow-x:hidden}
img,svg{max-width:100%;height:auto;display:block}
a{color:var(--water);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3,h4{line-height:1.35;margin:0 0 .6em;font-weight:700;color:var(--ink)}
h1{font-size:clamp(1.5rem,3.2vw,2.3rem)}
h2{font-size:clamp(1.3rem,2.4vw,1.75rem)}
h3{font-size:1.15rem}
h4{font-size:1rem}
p{margin:0 0 1em}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px}

/* header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(28,33,40,.96);backdrop-filter:blur(8px);color:#fff;border-bottom:1px solid rgba(255,255,255,.08)}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;min-height:64px;gap:16px}
.brand{display:flex;align-items:center;gap:10px;color:#fff;font-weight:700;font-size:1.15rem;white-space:nowrap}
.brand:hover{text-decoration:none}
.brand-mark{width:34px;height:34px;border-radius:9px;background:linear-gradient(135deg,var(--waste),var(--water));display:grid;place-items:center;font-size:.8rem;color:#fff;letter-spacing:1px;flex:none}
.brand small{display:block;font-size:.68rem;font-weight:400;color:#aab6c3;letter-spacing:.5px;line-height:1.1}
.nav-toggle{display:none;background:none;border:1px solid rgba(255,255,255,.3);color:#fff;border-radius:8px;padding:6px 10px;font-size:.9rem;cursor:pointer}
.main-nav ul{list-style:none;margin:0;padding:0;display:flex;gap:2px;flex-wrap:wrap;justify-content:flex-end}
.main-nav a{display:block;padding:8px 10px;color:#d7dee6;font-size:.86rem;border-radius:8px;white-space:nowrap}
.main-nav a:hover,.main-nav a.active{background:rgba(255,255,255,.1);color:#fff;text-decoration:none}
.main-nav a.active{box-shadow:inset 0 -2px 0 var(--water)}

/* hero */
.hero{background:radial-gradient(1200px 500px at 80% -10%,rgba(26,127,163,.35),transparent 60%),radial-gradient(800px 400px at 10% 110%,rgba(15,107,95,.35),transparent 60%),linear-gradient(160deg,var(--graphite),var(--slate));color:#e8eef4;padding:56px 0 48px}
.hero .wrap{display:grid;grid-template-columns:1.05fr .95fr;gap:36px;align-items:center}
.hero h1{color:#fff;font-size:clamp(1.35rem,2.6vw,2rem)}
.hero .eyebrow{display:inline-block;font-size:.78rem;letter-spacing:2px;text-transform:uppercase;color:#8fd3e8;margin-bottom:12px;border:1px solid rgba(143,211,232,.4);padding:3px 10px;border-radius:99px}
.hero p{color:#c8d3dd;font-size:1rem}
.hero .lead{font-size:1.02rem}
.hero-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
.hero-tags span{font-size:.76rem;padding:4px 10px;border-radius:999px;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.14);color:#dbe5ee}
.hero-visual{background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.1);border-radius:18px;padding:12px}
.hero-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px}
.btn{display:inline-block;padding:10px 18px;border-radius:10px;font-weight:600;font-size:.92rem;border:1px solid transparent}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn-primary{background:var(--water);color:#fff}
.btn-ghost{border-color:rgba(255,255,255,.35);color:#fff}
.btn-waste{background:var(--waste);color:#fff}
.page-hero{padding:44px 0 36px}
.page-hero .wrap{grid-template-columns:1.1fr .9fr}

/* sections */
.section{padding:56px 0}
.section.alt{background:var(--paper);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.section.dark{background:var(--graphite);color:#dfe6ee}
.section.dark h2,.section.dark h3,.section.dark h4{color:#fff}
.section.dark p{color:#c3ccd6}
.section-head{max-width:820px;margin-bottom:28px}
.section-head .kicker{font-size:.8rem;letter-spacing:2px;text-transform:uppercase;color:var(--water);font-weight:700}
.section-head p{color:var(--ink-2)}
.section.dark .section-head p{color:#b9c4cf}
.kicker.waste{color:var(--waste)}.kicker.sort{color:var(--sort)}.kicker.leak{color:var(--leak)}.kicker.ww{color:var(--ww)}

/* grids */
.grid{display:grid;gap:20px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.card{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow)}
.card h3{font-size:1.05rem}
.card p{color:var(--ink-2);font-size:.95rem;margin-bottom:.5em}
.card.tone-waste{border-top:4px solid var(--waste)}
.card.tone-water{border-top:4px solid var(--water)}
.card.tone-sort{border-top:4px solid var(--sort)}
.card.tone-leak{border-top:4px solid var(--leak)}
.card.tone-ww{border-top:4px solid var(--ww)}
.card.tone-warn{border-top:4px solid var(--warn)}
.section.dark .card{background:var(--graphite-2);border-color:rgba(255,255,255,.1);color:#dfe6ee}
.section.dark .card p{color:#b9c4cf}

/* flow chain */
.flow{display:flex;flex-wrap:wrap;align-items:stretch;gap:8px;margin:18px 0;padding:0;list-style:none}
.flow li{position:relative;flex:1 1 120px;min-width:110px;background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:10px 12px;font-size:.86rem;text-align:center;font-weight:600;color:var(--ink-2)}
.flow li:not(:last-child)::after{content:"→";position:absolute;right:-11px;top:50%;transform:translateY(-50%);color:var(--muted);font-weight:400;z-index:1}
.flow.waste li{border-color:var(--waste);background:var(--waste-soft);color:var(--waste)}
.flow.water li{border-color:var(--water);background:var(--water-soft);color:#12617d}
.flow.sort li{border-color:var(--sort);background:var(--sort-soft);color:#38399a}
.flow.leak li{border-color:var(--leak);background:var(--leak-soft);color:#9a5118}
.flow.ww li{border-color:var(--ww);background:var(--ww-soft);color:var(--ww)}
.flow.vertical{flex-direction:column;max-width:360px}
.flow.vertical li{flex:none;margin-bottom:10px}
.flow.vertical li:not(:last-child)::after{content:"↓";right:auto;left:50%;top:auto;bottom:-16px;transform:translateX(-50%)}
.section.dark .flow li{background:rgba(255,255,255,.06);border-color:rgba(255,255,255,.18);color:#e6edf3}

/* two-stream explainer */
.streams{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.stream{border-radius:var(--radius);padding:26px;color:#fff;position:relative;overflow:hidden}
.stream.waste{background:linear-gradient(150deg,#0f6b5f,#0b4d45)}
.stream.water{background:linear-gradient(150deg,#1a7fa3,#124f66)}
.stream h3{color:#fff;font-size:1.2rem}
.stream p{color:#d9e9ec;font-size:.95rem}
.stream ul{margin:0;padding-left:1.1em;color:#e2eff2;font-size:.9rem;columns:2;column-gap:20px}
.stream li{break-inside:avoid}
.bridge{background:var(--paper);border:1px dashed var(--line);border-radius:var(--radius);padding:22px 26px;margin-top:22px}
.bridge strong{color:var(--waste)}

/* long articles */
.article-list{display:grid;gap:26px}
.article{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:30px 32px;box-shadow:var(--shadow)}
.article .meta{display:flex;flex-wrap:wrap;gap:10px;align-items:center;font-size:.78rem;color:var(--muted);margin-bottom:8px}
.article .meta .cat{padding:2px 9px;border-radius:99px;font-weight:600;color:#fff;background:var(--slate)}
.cat.waste{background:var(--waste)}.cat.water{background:var(--water)}.cat.sort{background:var(--sort)}.cat.leak{background:var(--leak)}.cat.ww{background:var(--ww)}.cat.model{background:var(--slate)}.cat.app{background:#3b6a8f}
.article h3{font-size:1.2rem}
.article h2{font-size:1.3rem}
.article p{color:var(--ink-2)}
.article .core{border-left:4px solid var(--waste);background:var(--bg);padding:12px 16px;border-radius:0 10px 10px 0;margin:14px 0;font-size:.95rem}
.article .core.water{border-left-color:var(--water)}
.article figure{margin:18px 0;background:var(--bg);border-radius:12px;padding:12px}
.article figcaption{font-size:.82rem;color:var(--muted);margin-top:6px}
.article details{margin-top:14px;border-top:1px solid var(--line);padding-top:10px}
.article summary{cursor:pointer;font-weight:700;color:var(--water);list-style:none;display:inline-flex;align-items:center;gap:8px}
.article summary::before{content:"＋";display:inline-grid;place-items:center;width:20px;height:20px;border-radius:50%;background:var(--water-soft);font-size:.8rem}
.article details[open] summary::before{content:"－"}
.article .full{margin-top:12px}
.article .full h4{margin-top:1.2em;color:var(--ink)}
.article ol,.article ul{color:var(--ink-2)}

/* teaser list */
.teasers{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.teaser{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:20px}
.teaser h3{font-size:1rem}
.teaser p{font-size:.9rem;color:var(--ink-2)}
.teaser .more{font-weight:600;font-size:.88rem}
.teaser .meta{font-size:.76rem;color:var(--muted);margin-bottom:6px}

/* observation column */
.observe{background:linear-gradient(180deg,#fff,#f6f8fa);border:1px solid var(--line);border-left:5px solid var(--waste);border-radius:var(--radius);padding:26px 28px}
.observe.water{border-left-color:var(--water)}
.observe.env{border-left-color:var(--sort)}
.observe h3{font-size:1.08rem}
.observe p{color:var(--ink-2);font-size:.95rem}

/* trends */
.trends{counter-reset:t;display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.trend{position:relative;padding:20px 20px 20px 62px;background:var(--graphite-2);border:1px solid rgba(255,255,255,.1);border-radius:12px}
.trend::before{counter-increment:t;content:"0" counter(t);position:absolute;left:18px;top:16px;font-size:1.5rem;font-weight:800;color:#5fb8d4;font-family:Georgia,serif}
.trend h3{font-size:1rem;color:#fff}
.trend p{font-size:.9rem;color:#b9c4cf;margin:0}

/* capability map */
.capmap{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.cap{border-radius:12px;padding:18px;color:#fff}
.cap h3{color:#fff;font-size:1rem}
.cap ul{margin:0;padding-left:1.1em;font-size:.86rem;color:#e6eef2}
.cap.waste{background:var(--waste)}.cap.water{background:var(--water)}.cap.leak{background:var(--leak)}.cap.ww{background:var(--ww)}.cap.sort{background:var(--sort)}

/* faq */
.faq{display:grid;gap:10px;max-width:900px}
.faq details{background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:0 18px}
.faq summary{cursor:pointer;padding:14px 0;font-weight:700;list-style:none;display:flex;justify-content:space-between;gap:12px}
.faq summary::after{content:"＋";color:var(--water);flex:none}
.faq details[open] summary::after{content:"－"}
.faq details p{padding-bottom:14px;color:var(--ink-2);margin:0;font-size:.95rem}

/* q&a blocks */
.qa{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.qa div{background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:16px 18px}
.qa h3{font-size:.98rem;margin-bottom:.3em}
.qa p{font-size:.9rem;color:var(--ink-2);margin:0}

/* demo panels */
.panel{background:var(--graphite);color:#dfe6ee;border-radius:var(--radius);padding:22px;border:1px solid rgba(255,255,255,.08)}
.panel h3{color:#fff}
.panel p{color:#c3ccd6}
.panel .note{font-size:.78rem;color:#9aa8b5;margin-top:10px}
.tabs{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:14px}
.tabs button{background:rgba(255,255,255,.08);color:#dfe6ee;border:1px solid rgba(255,255,255,.15);padding:6px 12px;border-radius:8px;cursor:pointer;font-size:.85rem}
.tabs button.active{background:var(--water);border-color:var(--water);color:#fff}
.tabs.waste button.active{background:var(--waste);border-color:var(--waste)}
.tabs.leak button.active{background:var(--leak);border-color:var(--leak)}
.tabs.sort button.active{background:var(--sort);border-color:var(--sort)}
.kpis{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin:10px 0}
.kpi{background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.1);border-radius:10px;padding:12px}
.kpi b{display:block;font-size:1.25rem;color:#fff}
.kpi span{font-size:.76rem;color:#9aa8b5}
.kpi.warn b{color:#f0c14b}.kpi.leak b{color:#f09a5a}.kpi.ok b{color:#6fd0b8}.kpi.water b{color:#6fc7e6}
.demo-table{width:100%;border-collapse:collapse;font-size:.85rem}
.demo-table th,.demo-table td{padding:8px 10px;border-bottom:1px solid rgba(255,255,255,.1);text-align:left}
.demo-table th{color:#9aa8b5;font-weight:600}
.tag{display:inline-block;padding:2px 8px;border-radius:99px;font-size:.74rem;font-weight:600}
.tag.ok{background:rgba(111,208,184,.18);color:#6fd0b8}.tag.warn{background:rgba(240,193,75,.18);color:#f0c14b}.tag.leak{background:rgba(240,154,90,.2);color:#f09a5a}.tag.info{background:rgba(111,199,230,.18);color:#6fc7e6}
.table-scroll{overflow-x:auto}
.bar{height:8px;border-radius:99px;background:rgba(255,255,255,.1);overflow:hidden;margin-top:6px}
.bar i{display:block;height:100%;width:0;background:var(--water);border-radius:99px;transition:width .8s}
.bar.waste i{background:var(--waste)}.bar.leak i{background:var(--leak)}.bar.warn i{background:var(--warn)}
.layer-list{list-style:none;padding:0;margin:0;display:grid;gap:8px}
.layer-list li{display:flex;justify-content:space-between;gap:10px;padding:8px 12px;border-radius:8px;background:rgba(255,255,255,.05);font-size:.86rem}
.layer-list li span{color:#9aa8b5;flex:none}
.layer-list li b{color:#fff;text-align:right;font-weight:500}
.layers{display:flex;flex-wrap:wrap;gap:12px;margin:10px 0}
.layers label{font-size:.85rem;display:flex;align-items:center;gap:6px;cursor:pointer}
.hidden{display:none!important}
.panel select{background:#2b3a4a;color:#fff;border:1px solid rgba(255,255,255,.2);border-radius:8px;padding:6px 10px;font-size:.88rem}

/* matrix */
.matrix{display:grid;grid-template-columns:160px repeat(3,1fr);gap:6px;font-size:.84rem}
.matrix div{padding:10px;border-radius:8px;background:var(--paper);border:1px solid var(--line)}
.matrix .h{background:var(--slate);color:#fff;font-weight:600}
.matrix .lvl1{background:var(--waste-soft)}.matrix .lvl2{background:var(--warn-soft)}.matrix .lvl3{background:var(--leak-soft)}

/* timeline */
.timeline{list-style:none;padding:0;margin:0;border-left:3px solid rgba(255,255,255,.15);display:grid;gap:14px}
.timeline li{position:relative;padding-left:22px;font-size:.9rem;color:#c3ccd6}
.timeline li::before{content:"";position:absolute;left:-9px;top:8px;width:13px;height:13px;border-radius:50%;background:var(--water);border:3px solid var(--graphite)}
.timeline li.warn::before{background:var(--warn)}.timeline li.leak::before{background:var(--leak)}.timeline li.ok::before{background:#6fd0b8}
.timeline b{color:#fff}

/* industries */
.industries{display:grid;grid-template-columns:repeat(5,1fr);gap:12px}
.ind{background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:14px;font-size:.86rem}
.ind h3{font-size:.95rem;margin-bottom:.3em}
.ind p{margin:0;color:var(--ink-2)}

/* app features */
.features{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.feature{background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:18px;position:relative}
.feature .num{position:absolute;right:14px;top:12px;font-size:1.4rem;font-weight:800;color:var(--line)}
.feature h3{font-size:1rem}
.feature p{font-size:.88rem;color:var(--ink-2);margin:0}
.download{background:linear-gradient(150deg,var(--slate),var(--graphite));color:#dfe6ee;border-radius:var(--radius);padding:30px;display:grid;grid-template-columns:1.2fr .8fr;gap:24px}
.download h3{color:#fff}
.download p{color:#c3ccd6}
.download .stores{display:grid;gap:10px}
.download .store{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.14);border-radius:10px;padding:12px 14px;font-size:.9rem}
.download .store b{display:block;color:#fff}
.download .store span{color:#9aa8b5;font-size:.82rem}

/* about + disclaimers */
.about{display:grid;grid-template-columns:1.2fr .8fr;gap:28px;align-items:start}
.disclaimers{display:grid;gap:12px}
.disclaimer{background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:14px 16px;font-size:.84rem;color:var(--ink-2)}
.disclaimer b{color:var(--ink)}

/* footer */
.site-footer{background:var(--graphite);color:#aab6c3;padding:40px 0 28px;font-size:.86rem}
.site-footer .cols{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:24px;margin-bottom:22px}
.site-footer h4{color:#fff;font-size:.95rem}
.site-footer ul{list-style:none;margin:0;padding:0}
.site-footer li{margin-bottom:6px}
.site-footer a{color:#c9d3dd}
.site-footer .legal{border-top:1px solid rgba(255,255,255,.1);padding-top:16px;font-size:.8rem;color:#8b98a6}
.site-footer .legal p{margin:0 0 4px}

/* breadcrumb */
.crumbs{font-size:.8rem;color:#9fb1c0;margin-bottom:10px}
.crumbs a{color:#bcd7e4}

/* misc */
.callout{background:var(--warn-soft);border:1px solid #efd58a;border-radius:12px;padding:14px 18px;font-size:.9rem;color:#5d4a0f}
.callout.blue{background:var(--water-soft);border-color:#a9d3e4;color:#12506a}
.callout.green{background:var(--waste-soft);border-color:#9fd3c5;color:#0b4d45}
.note-small{font-size:.78rem;color:var(--muted)}
.link-row{display:flex;flex-wrap:wrap;gap:10px 22px;margin-top:14px}
.link-row a{font-weight:600;font-size:.9rem}
.toplink{position:fixed;right:16px;bottom:16px;background:var(--slate);color:#fff;width:40px;height:40px;border-radius:50%;display:grid;place-items:center;opacity:0;pointer-events:none;transition:.3s;z-index:40;border:none;cursor:pointer}
.toplink.show{opacity:1;pointer-events:auto}
.fade{opacity:0;transform:translateY(14px);transition:opacity .6s,transform .6s}
.fade.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.fade{opacity:1;transform:none;transition:none}}

/* responsive */
@media (max-width:1024px){
  .grid-4,.capmap,.features,.kpis{grid-template-columns:repeat(2,1fr)}
  .industries{grid-template-columns:repeat(3,1fr)}
  .teasers,.grid-3{grid-template-columns:repeat(2,1fr)}
  .hero .wrap,.page-hero .wrap{grid-template-columns:1fr}
  .main-nav a{font-size:.8rem;padding:6px 8px}
}
@media (max-width:768px){
  .nav-toggle{display:block}
  .main-nav{display:none;width:100%}
  .main-nav.open{display:block}
  .main-nav ul{flex-direction:column;gap:0;padding-bottom:10px}
  .main-nav a{padding:10px 8px;font-size:.92rem;border-bottom:1px solid rgba(255,255,255,.06)}
  .site-header .wrap{flex-wrap:wrap}
  .streams,.grid-2,.qa,.trends,.teasers,.grid-3,.about,.download,.site-footer .cols{grid-template-columns:1fr}
  .stream ul{columns:1}
  .flow{flex-direction:column}
  .flow li{flex:none;margin-bottom:10px}
  .flow li:not(:last-child)::after{content:"↓";right:auto;left:50%;top:auto;bottom:-17px;transform:translateX(-50%)}
  .matrix{grid-template-columns:1fr}
  .article{padding:22px 18px}
  .section{padding:40px 0}
  .hero{padding:40px 0 32px}
  .industries{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:430px){
  .grid-4,.capmap,.features,.kpis,.industries{grid-template-columns:1fr}
  body{font-size:15px}
  .hero-tags span{font-size:.7rem}
}