/* pg电子官网 - AI PCB Design / Intelligent EDA
   视觉语言：AI EDA Engineering Workbench + PCB Routing Laboratory + SI Analysis Console */

:root{
  --bg:#f3f5f7;
  --bg-2:#e9edf1;
  --panel:#ffffff;
  --panel-2:#f8fafc;
  --graphite:#171c23;
  --graphite-2:#222a33;
  --graphite-3:#2d3641;
  --text:#1c2229;
  --text-2:#4a5561;
  --text-3:#6f7c89;
  --line:#d7dee6;
  --line-2:#c2ccd6;
  --blue:#123f73;
  --blue-2:#1c5aa5;
  --cyan:#1697bd;
  --cyan-2:#5fc3de;
  --pcb:#1e5a3d;
  --pcb-2:#2f7d56;
  --power:#e0842a;
  --drc:#d9432f;
  --amber:#e6b23c;
  --radius:10px;
  --radius-lg:16px;
  --shadow:0 1px 2px rgba(20,30,40,.06),0 8px 24px rgba(20,30,40,.06);
  --mono:"SFMono-Regular",Consolas,"Liberation Mono",Menlo,"Courier New",monospace;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC","Helvetica Neue",Arial,sans-serif;
  --max:1200px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;font-family:var(--sans);font-size:16px;line-height:1.75;color:var(--text);background:var(--bg);overflow-x:hidden}
img,svg{max-width:100%;height:auto;display:block}
a{color:var(--blue-2);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3,h4{line-height:1.3;margin:0 0 .6em;font-weight:700;color:var(--text)}
h1{font-size:clamp(1.5rem,2.4vw+1rem,2.4rem)}
h2{font-size:clamp(1.35rem,1.2vw+1rem,1.9rem)}
h3{font-size:1.2rem}
h4{font-size:1.05rem}
p{margin:0 0 1em}
ul,ol{padding-left:1.4em;margin:0 0 1em}
li{margin-bottom:.35em}
code,kbd{font-family:var(--mono);font-size:.9em;background:var(--bg-2);padding:.1em .4em;border-radius:4px}
.container{max-width:var(--max);margin:0 auto;padding:0 20px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}

/* ---------- Header ---------- */
.site-header{position:sticky;top:0;z-index:50;background:rgba(23,28,35,.96);color:#e6edf3;border-bottom:1px solid #2d3641;backdrop-filter:saturate(140%) blur(6px)}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:62px}
.brand{display:flex;align-items:center;gap:10px;color:#fff;font-weight:700;font-size:1.15rem;letter-spacing:.02em}
.brand:hover{text-decoration:none}
.brand-mark{width:34px;height:34px;flex:0 0 34px}
.brand small{display:block;font-size:.68rem;font-weight:400;color:#9fb1c2;letter-spacing:.08em}
.nav-toggle{display:none;background:transparent;border:1px solid #3d4855;color:#e6edf3;border-radius:8px;padding:8px 10px;cursor:pointer;font-size:.9rem}
.nav ul{list-style:none;margin:0;padding:0;display:flex;gap:2px;flex-wrap:wrap}
.nav a{display:block;padding:8px 11px;border-radius:7px;color:#d3dde7;font-size:.88rem;white-space:nowrap}
.nav a:hover,.nav a[aria-current="page"]{background:#2b3745;color:#fff;text-decoration:none}
.nav a[aria-current="page"]{box-shadow:inset 0 -2px 0 var(--cyan-2)}

/* ---------- Hero ---------- */
.hero{background:radial-gradient(1200px 500px at 85% -10%,rgba(22,151,189,.25),transparent 60%),linear-gradient(160deg,var(--graphite) 0%,var(--graphite-2) 55%,#1a2f45 100%);color:#e8eef4;padding:56px 0 48px;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:32px 32px;pointer-events:none}
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:center;position:relative}
.hero h1{color:#fff;font-size:clamp(1.45rem,1.8vw+1rem,2.15rem)}
.hero .eyebrow{display:inline-flex;align-items:center;gap:8px;font-family:var(--mono);font-size:.74rem;letter-spacing:.12em;text-transform:uppercase;color:var(--cyan-2);margin-bottom:14px}
.hero .eyebrow::before{content:"";width:22px;height:2px;background:var(--cyan)}
.hero-lead{font-size:1.02rem;color:#c8d3de;max-width:640px}
.hero-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:20px}
.btn{display:inline-block;padding:10px 18px;border-radius:8px;font-weight:600;font-size:.92rem;border:1px solid transparent;cursor:pointer;transition:transform .12s ease,background .15s}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn-primary{background:var(--cyan);color:#06222c}
.btn-primary:hover{background:var(--cyan-2)}
.btn-ghost{border-color:#4b5867;color:#e6edf3;background:transparent}
.btn-ghost:hover{background:#2b3745}
.hero-visual{background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.1);border-radius:var(--radius-lg);padding:14px}
.hero-visual figcaption,.figure figcaption{font-size:.8rem;color:#9fb1c2;margin-top:8px;font-family:var(--mono)}
.hero-tags{display:flex;flex-wrap:wrap;gap:6px;margin-top:22px}
.tag{font-family:var(--mono);font-size:.72rem;padding:3px 9px;border-radius:999px;border:1px solid #3d4855;color:#b8c6d3;background:rgba(0,0,0,.2)}

/* ---------- Page hero (secondary) ---------- */
.page-hero{background:linear-gradient(150deg,var(--graphite) 0%,#1d2a3a 100%);color:#e8eef4;padding:44px 0 36px;border-bottom:4px solid var(--cyan)}
.page-hero h1{color:#fff}
.page-hero p{color:#c8d3de;max-width:820px}
.breadcrumb{font-size:.82rem;color:#9fb1c2;margin-bottom:14px;font-family:var(--mono)}
.breadcrumb a{color:#c8d3de}
.breadcrumb span{margin:0 6px;color:#5d6b79}

/* ---------- Sections ---------- */
.section{padding:52px 0}
.section-alt{background:var(--panel);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.section-dark{background:var(--graphite);color:#dbe4ec}
.section-dark h2,.section-dark h3{color:#fff}
.section-dark p{color:#c3cdd7}
.section-head{margin-bottom:28px;max-width:860px}
.section-head .kicker{font-family:var(--mono);font-size:.74rem;letter-spacing:.12em;text-transform:uppercase;color:var(--cyan);margin-bottom:6px}
.section-head p{color:var(--text-2)}
.section-dark .section-head p{color:#b6c2ce}

/* ---------- Grids & cards ---------- */
.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(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow)}
.card h3{font-size:1.05rem}
.card .meta{font-family:var(--mono);font-size:.74rem;color:var(--text-3);margin-bottom:8px}
.card-dark{background:var(--graphite-2);border-color:#3a4551;color:#dbe4ec}
.card-dark h3{color:#fff}
.card-dark p{color:#b6c2ce}
.pill{display:inline-block;font-family:var(--mono);font-size:.7rem;padding:2px 8px;border-radius:999px;background:var(--bg-2);color:var(--text-2);border:1px solid var(--line);margin-right:6px}
.pill-cyan{background:#e3f4f9;color:#0e6d8a;border-color:#bfe3ee}
.pill-power{background:#fdf0e3;color:#9c5312;border-color:#f3d5b4}
.pill-drc{background:#fbe6e3;color:#a02b1d;border-color:#f1c2bb}
.pill-pcb{background:#e4f1ea;color:#1e5a3d;border-color:#bcdccb}

/* ---------- Process flow ---------- */
.flow{display:flex;flex-wrap:wrap;gap:8px;list-style:none;padding:0;margin:0}
.flow li{position:relative;background:var(--panel);border:1px solid var(--line);border-radius:8px;padding:8px 12px;font-size:.85rem;font-family:var(--mono);color:var(--text)}
.flow li.ai{border-color:var(--cyan);background:#e9f6fa;color:#0e5f78}
.flow li.human{border-color:var(--power);background:#fdf3e8;color:#8a4a10}
.flow li.check{border-color:var(--drc);background:#fdece9;color:#9a2a1e}
.flow li::after{content:"→";position:absolute;right:-13px;top:50%;transform:translateY(-50%);color:var(--line-2);font-size:.9rem}
.flow li:last-child::after{content:""}
.flow-note{font-size:.85rem;color:var(--text-3);margin-top:12px}

/* ---------- Articles ---------- */
.article-list{display:grid;gap:26px}
.article{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius-lg);padding:30px 32px;box-shadow:var(--shadow)}
.article header{margin-bottom:14px}
.article .meta{display:flex;flex-wrap:wrap;gap:12px;align-items:center;font-family:var(--mono);font-size:.76rem;color:var(--text-3);margin-bottom:10px}
.article .meta .cat{color:var(--blue-2);font-weight:600}
.article h3,.article h2{font-size:1.25rem;line-height:1.45}
.article p{color:var(--text-2)}
.article .core{border-left:4px solid var(--cyan);background:var(--panel-2);padding:12px 16px;border-radius:0 8px 8px 0;margin:14px 0;color:var(--text)}
.article .core strong{color:var(--blue)}
.article .more{font-weight:600;font-family:var(--mono);font-size:.82rem}
.article-full{padding:36px 40px}
.article-full h2{font-size:1.5rem}
.article-full h3{font-size:1.1rem;margin-top:1.6em;color:var(--blue)}
.article-full p{color:var(--text)}
.article-full .figure{margin:22px 0}
.demo-note{font-size:.8rem;color:var(--text-3);border-top:1px dashed var(--line);padding-top:10px;margin-top:20px;font-family:var(--mono)}

/* ---------- Observation (dark editorial) ---------- */
.observe{display:grid;gap:22px}
.observe .article{background:var(--graphite-2);border-color:#3a4551}
.observe .article h3{color:#fff}
.observe .article p{color:#c3cdd7}
.observe .article .meta{color:#8d9cab}
.observe .article .core{background:#1c232c;border-color:var(--power);color:#e8eef4}
.observe .article .core strong{color:#ffc98a}

/* ---------- Tables ---------- */
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);background:var(--panel)}
table{border-collapse:collapse;width:100%;min-width:640px;font-size:.9rem}
th,td{padding:10px 14px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}
th{background:var(--panel-2);font-family:var(--mono);font-size:.76rem;letter-spacing:.06em;text-transform:uppercase;color:var(--text-2)}
tr:last-child td{border-bottom:0}
td.hard{color:var(--drc);font-weight:600}
td.soft{color:var(--power);font-weight:600}
td.ai{color:var(--cyan);font-weight:600}
td.human{color:var(--pcb);font-weight:600}

/* ---------- Capability map ---------- */
.cap-map{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.cap{background:var(--graphite-2);border:1px solid #3a4551;border-radius:var(--radius);padding:18px}
.cap h3{color:#fff;font-size:1rem;display:flex;align-items:center;gap:8px}
.cap h3 i{width:10px;height:10px;border-radius:2px;display:inline-block}
.cap ul{list-style:none;padding:0;margin:0}
.cap li{font-size:.85rem;color:#b6c2ce;padding:4px 0;border-bottom:1px dashed #3a4551}
.cap li:last-child{border-bottom:0}
.cap li b{color:#e6edf3;font-weight:600}

/* ---------- Trends ---------- */
.trends{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;counter-reset:trend}
.trend{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:20px 22px 20px 64px;position:relative}
.trend::before{counter-increment:trend;content:"0" counter(trend);position:absolute;left:18px;top:18px;font-family:var(--mono);font-size:1.3rem;font-weight:700;color:var(--cyan)}
.trend h3{font-size:1rem}
.trend p{font-size:.92rem;color:var(--text-2);margin:0}

/* ---------- FAQ ---------- */
.faq{display:grid;gap:10px}
.faq-item{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius)}
.faq-item h3{margin:0}
.faq-q{width:100%;text-align:left;background:none;border:0;padding:16px 48px 16px 18px;font:inherit;font-weight:600;font-size:1rem;color:var(--text);cursor:pointer;position:relative}
.faq-q::after{content:"+";position:absolute;right:18px;top:12px;font-size:1.4rem;color:var(--cyan);font-weight:400}
.faq-item.open .faq-q::after{content:"−"}
.faq-a{padding:0 18px 16px;color:var(--text-2);display:none}
.faq-item.open .faq-a{display:block}
.no-js .faq-a{display:block}

/* ---------- QA blocks (secondary pages) ---------- */
.qa{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.qa .card h3{font-size:1rem;color:var(--blue)}
.qa .card p{font-size:.93rem;color:var(--text-2);margin:0}

/* ---------- Layer switcher demo ---------- */
.layer-demo{background:var(--graphite-2);border:1px solid #3a4551;border-radius:var(--radius-lg);padding:18px;color:#dbe4ec}
.layer-tabs{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:12px}
.layer-tabs button{background:#1c232c;border:1px solid #3d4855;color:#c8d3de;border-radius:6px;padding:6px 12px;font-family:var(--mono);font-size:.78rem;cursor:pointer}
.layer-tabs button[aria-pressed="true"]{background:var(--cyan);color:#06222c;border-color:var(--cyan)}
.layer-panel{display:none;font-size:.9rem}
.layer-panel.active{display:block}
.layer-panel p{color:#c3cdd7}
.layer-svg{background:#10151b;border-radius:8px;padding:10px;margin-bottom:10px}
.layer-svg svg{width:100%;height:auto}

/* ---------- DRC filter demo ---------- */
.drc-demo{border:1px solid var(--line);border-radius:var(--radius);background:var(--panel);overflow:hidden}
.drc-filter{display:flex;flex-wrap:wrap;gap:6px;padding:12px 14px;border-bottom:1px solid var(--line);background:var(--panel-2)}
.drc-filter button{border:1px solid var(--line-2);background:#fff;border-radius:6px;padding:5px 10px;font-family:var(--mono);font-size:.76rem;cursor:pointer}
.drc-filter button[aria-pressed="true"]{background:var(--blue);color:#fff;border-color:var(--blue)}
.drc-list{list-style:none;margin:0;padding:0}
.drc-list li{display:grid;grid-template-columns:90px 110px 1fr;gap:10px;padding:10px 14px;border-bottom:1px solid var(--line);font-size:.88rem;align-items:start}
.drc-list li:last-child{border-bottom:0}
.drc-list .sev{font-family:var(--mono);font-size:.72rem;font-weight:700;padding:2px 6px;border-radius:4px;text-align:center}
.sev-hard{background:#fbe6e3;color:var(--drc)}
.sev-soft{background:#fdf0e3;color:#9c5312}
.sev-info{background:#e3f4f9;color:#0e6d8a}
.drc-list .type{font-family:var(--mono);font-size:.76rem;color:var(--text-2)}
.drc-list li[hidden]{display:none}

/* ---------- App features ---------- */
.features{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;counter-reset:feat}
.feature{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:18px;position:relative}
.feature::before{counter-increment:feat;content:counter(feat,decimal-leading-zero);font-family:var(--mono);color:var(--cyan);font-size:.8rem;font-weight:700}
.feature h3{font-size:1rem;margin:4px 0 6px}
.feature p{font-size:.88rem;color:var(--text-2);margin:0}
.download{background:linear-gradient(135deg,#0f2a44,#123f73);color:#e8eef4;border-radius:var(--radius-lg);padding:32px}
.download h2{color:#fff}
.download p{color:#c8d3de}
.download-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:18px}
.download-item{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.14);border-radius:10px;padding:16px}
.download-item h3{color:#fff;font-size:1rem}
.download-item p{font-size:.86rem;margin:0}
.download-item .status{display:inline-block;font-family:var(--mono);font-size:.72rem;padding:2px 8px;border-radius:999px;background:rgba(224,132,42,.2);color:#ffc98a;border:1px solid rgba(224,132,42,.5);margin-top:8px}

/* ---------- About / notices ---------- */
.about{display:grid;grid-template-columns:1.2fr .8fr;gap:30px;align-items:start}
.notice{background:var(--panel-2);border:1px solid var(--line);border-radius:var(--radius);padding:16px 18px;font-size:.85rem;color:var(--text-2)}
.notice strong{color:var(--text)}
.link-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:12px}
.link-row a{font-size:.88rem;padding:6px 12px;border:1px solid var(--line-2);border-radius:999px;background:#fff}
.link-row a:hover{border-color:var(--cyan);text-decoration:none;color:var(--cyan)}

/* ---------- Figure ---------- */
.figure{margin:0;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:14px}
.figure figcaption{color:var(--text-3)}
.figure-dark{background:var(--graphite-2);border-color:#3a4551}
.figure-dark figcaption{color:#9fb1c2}

/* ---------- Footer ---------- */
.site-footer{background:#10151b;color:#9fb1c2;padding:40px 0 28px;border-top:1px solid #2d3641;font-size:.88rem}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:28px}
.site-footer h4{color:#e6edf3;font-size:.95rem}
.site-footer ul{list-style:none;padding:0;margin:0}
.site-footer li{margin-bottom:6px}
.site-footer a{color:#c8d3de}
.footer-legal{border-top:1px solid #2d3641;margin-top:26px;padding-top:16px;font-size:.8rem;color:#7d8c9b}
.footer-legal p{margin:0 0 6px}

/* ---------- Utilities ---------- */
.mt-0{margin-top:0}.mt-2{margin-top:16px}.mt-3{margin-top:24px}.mt-4{margin-top:32px}
.muted{color:var(--text-3)}
.small{font-size:.86rem}
.reveal{opacity:0;transform:translateY(10px);transition:opacity .5s ease,transform .5s ease}
.reveal.in{opacity:1;transform:none}
.no-js .reveal{opacity:1;transform:none}
.to-top{position:fixed;right:18px;bottom:18px;width:40px;height:40px;border-radius:50%;background:var(--blue);color:#fff;border:0;cursor:pointer;display:none;z-index:40;font-size:1.1rem}
.to-top.show{display:block}

/* ---------- Responsive ---------- */
@media (max-width:1024px){
  .hero-grid{grid-template-columns:1fr}
  .grid-4,.cap-map,.features{grid-template-columns:repeat(2,1fr)}
  .grid-3{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
  .about{grid-template-columns:1fr}
}
@media (max-width:860px){
  .nav-toggle{display:inline-block}
  .nav{display:none;width:100%}
  .nav.open{display:block}
  .header-inner{flex-wrap:wrap}
  .nav ul{flex-direction:column;padding:8px 0 12px}
  .nav a{white-space:normal}
}
@media (max-width:768px){
  .grid-2,.grid-3,.trends,.qa,.download-grid{grid-template-columns:1fr}
  .article{padding:22px 20px}
  .article-full{padding:26px 20px}
  .section{padding:40px 0}
  .drc-list li{grid-template-columns:70px 1fr}
  .drc-list .type{grid-column:2}
  .drc-list .desc{grid-column:1/-1}
}
@media (max-width:480px){
  body{font-size:15px}
  .grid-4,.cap-map,.features,.footer-grid{grid-template-columns:1fr}
  .hero{padding:40px 0 32px}
  .flow li::after{display:none}
  .flow{flex-direction:column}
}
@media print{
  .site-header,.to-top,.nav-toggle{display:none}
  .faq-a{display:block}
}