/* NovaKey — 虚构演示站
   Layout: 左对齐的"密钥卡片"语言 —— 圆角极小、等宽地址条、琥珀色作为唯一强调色 */
:root{
  --bg:#F2F4F1;
  --surface:#FFFFFF;
  --ink:#0E1F21;
  --muted:#4F5F60;
  --line:#D6DDD9;
  --deep:#0B3436;        /* 深墨青：英雄区/底部 CTA 底色 */
  --deep-ink:#E9F1EE;
  --accent:#E3A13A;      /* 琥珀：唯一强调色 */
  --accent-ink:#1A1205;
  --ok:#2F8F5B;
  --f-display:"Bricolage Grotesque","Noto Sans SC",system-ui,sans-serif;
  --f-body:"Noto Sans SC",system-ui,-apple-system,"PingFang SC",sans-serif;
  --f-mono:"JetBrains Mono",ui-monospace,Menlo,monospace;
  --r:6px;
  --max:1160px;
  color-scheme:light;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --bg:#0A1415;--surface:#112022;--ink:#E6EEEC;--muted:#9AABA9;--line:#22373A;
  --deep:#06292B;--deep-ink:#E6EEEC;--accent:#F0B357;--accent-ink:#1A1205;--ok:#55B984;color-scheme:dark}}
:root[data-theme="dark"]{
  --bg:#0A1415;--surface:#112022;--ink:#E6EEEC;--muted:#9AABA9;--line:#22373A;
  --deep:#06292B;--deep-ink:#E6EEEC;--accent:#F0B357;--accent-ink:#1A1205;--ok:#55B984;color-scheme:dark}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important;animation:none!important}}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--f-body);font-size:16px;line-height:1.7;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:inherit}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
h1,h2,h3{font-family:var(--f-display);line-height:1.2;text-wrap:balance;margin:0;letter-spacing:-.01em}
h1{font-size:clamp(2.1rem,5vw,3.6rem);font-weight:800}
h2{font-size:clamp(1.6rem,3.2vw,2.3rem);font-weight:800}
h3{font-size:1.15rem;font-weight:700}
p{margin:0}
.wrap{max-width:var(--max);margin-inline:auto;padding-inline:20px}
.mono{font-family:var(--f-mono);font-size:.85em;font-variant-numeric:tabular-nums}
.eyebrow{font-family:var(--f-mono);font-size:.78rem;letter-spacing:.12em;text-transform:uppercase;color:var(--muted)}
.lead{font-size:1.1rem;color:var(--muted);max-width:60ch}
.section{padding-block:clamp(56px,8vw,96px)}
.section-head{display:grid;gap:12px;margin-bottom:40px;max-width:720px}

/* 演示声明条 */
.demo-bar{background:var(--accent);color:var(--accent-ink);font-size:.82rem;text-align:center;padding:6px 16px;font-weight:500}

/* Header */
.site-header{position:sticky;top:env(safe-area-inset-top,0px);z-index:50;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;gap:16px;height:66px}
.logo{display:flex;align-items:center;gap:10px;text-decoration:none;font-family:var(--f-display);font-weight:800;font-size:1.2rem}
.logo-mark{width:30px;height:30px;border-radius:7px;background:var(--deep);display:grid;place-items:center;flex:none}
.logo-mark svg{width:18px;height:18px}
.menu{display:flex;gap:4px;list-style:none;margin:0;padding:0}
.menu a{display:block;padding:8px 12px;border-radius:var(--r);text-decoration:none;font-size:.95rem;color:var(--muted)}
.menu a:hover{color:var(--ink);background:var(--surface)}
.menu a[aria-current="page"]{color:var(--ink);font-weight:600;box-shadow:inset 0 -2px 0 var(--accent)}
.nav-cta{display:flex;gap:10px;align-items:center}
.burger{display:none;background:none;border:1px solid var(--line);border-radius:var(--r);width:42px;height:42px;cursor:pointer;color:var(--ink)}
.burger svg{width:20px;height:20px;margin:auto}
@media (max-width:920px){
  .menu{display:none;position:absolute;left:0;right:0;top:66px;flex-direction:column;background:var(--bg);border-bottom:1px solid var(--line);padding:12px 20px 20px}
  .menu.open{display:flex}
  .menu a{padding:12px}
  .burger{display:grid}
  .nav-cta .btn{display:none}
}

/* Buttons */
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 20px;border-radius:var(--r);font-weight:600;font-size:.95rem;text-decoration:none;border:1px solid transparent;cursor:pointer;font-family:var(--f-body);transition:transform .15s,background .15s}
.btn:hover{transform:translateY(-1px)}
.btn-primary{background:var(--accent);color:var(--accent-ink)}
.btn-primary:hover{background:color-mix(in srgb,var(--accent) 88%,#fff)}
.btn-ghost{border-color:var(--line);color:var(--ink);background:transparent}
.btn-ghost:hover{background:var(--surface)}
.on-deep .btn-ghost{border-color:color-mix(in srgb,var(--deep-ink) 30%,transparent);color:var(--deep-ink)}
.on-deep .btn-ghost:hover{background:color-mix(in srgb,var(--deep-ink) 10%,transparent)}
.btn-row{display:flex;flex-wrap:wrap;gap:12px}

/* Hero */
.hero{background:var(--deep);color:var(--deep-ink);overflow:hidden;position:relative}
.hero .wrap{display:grid;grid-template-columns:1.15fr .85fr;gap:48px;align-items:center;padding-block:clamp(56px,8vw,104px)}
.hero .lead{color:color-mix(in srgb,var(--deep-ink) 72%,transparent)}
.hero .eyebrow{color:var(--accent)}
.hero-copy{display:grid;gap:22px;min-width:0}
.hero h1 em{font-style:normal;color:var(--accent)}
.page-hero .wrap{grid-template-columns:1fr;padding-block:clamp(48px,7vw,80px)}
@media (max-width:860px){.hero .wrap{grid-template-columns:1fr}}

/* 钱包卡片插画 */
.keycard{background:color-mix(in srgb,var(--deep-ink) 6%,transparent);border:1px solid color-mix(in srgb,var(--deep-ink) 16%,transparent);border-radius:14px;padding:22px;display:grid;gap:16px;min-width:0;font-size:.92rem}
.keycard-top{display:flex;justify-content:space-between;align-items:center}
.balance{font-family:var(--f-display);font-size:2.2rem;font-weight:800;font-variant-numeric:tabular-nums}
.addr{font-family:var(--f-mono);font-size:.8rem;padding:8px 10px;border-radius:var(--r);background:color-mix(in srgb,var(--deep-ink) 8%,transparent);overflow-wrap:anywhere}
.asset-row{display:grid;grid-template-columns:auto 1fr auto;gap:12px;align-items:center;padding-block:8px;border-top:1px solid color-mix(in srgb,var(--deep-ink) 12%,transparent)}
.chip{width:30px;height:30px;border-radius:50%;display:grid;place-items:center;font-family:var(--f-mono);font-size:.68rem;font-weight:700;background:color-mix(in srgb,var(--accent) 22%,transparent);color:var(--accent)}
.asset-row small{display:block;color:color-mix(in srgb,var(--deep-ink) 60%,transparent);font-size:.78rem}
.num{font-variant-numeric:tabular-nums;text-align:right}

/* Trust bar */
.trust{border-bottom:1px solid var(--line);background:var(--surface)}
.trust .wrap{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;padding-block:28px}
.stat strong{display:block;font-family:var(--f-display);font-size:1.7rem;font-weight:800;font-variant-numeric:tabular-nums}
.stat span{color:var(--muted);font-size:.88rem}
@media (max-width:720px){.trust .wrap{grid-template-columns:repeat(2,1fr)}}

/* Grids */
.grid{display:grid;gap:20px}
.g3{grid-template-columns:repeat(3,1fr)}
.g2{grid-template-columns:repeat(2,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
@media (max-width:960px){.g4{grid-template-columns:repeat(2,1fr)}.g3{grid-template-columns:repeat(2,1fr)}}
@media (max-width:640px){.g3,.g2,.g4{grid-template-columns:1fr}}
.grid>*{min-width:0}

.card{background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:26px;display:flex;flex-direction:column;gap:12px}
.card p{color:var(--muted)}
.card .more{margin-top:auto;font-weight:600;text-decoration:none;color:var(--ink);display:inline-flex;gap:6px}
.card .more:hover{color:var(--accent)}
.icon{width:42px;height:42px;border-radius:8px;display:grid;place-items:center;background:color-mix(in srgb,var(--accent) 16%,transparent);color:var(--ink)}
.icon svg{width:22px;height:22px;stroke:currentColor;fill:none;stroke-width:1.8}

/* 优势：横向带编号说明的条目（编号即分类，非顺序时不用编号） */
.adv{display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid var(--ink)}
.adv>div{padding:28px 24px 8px 0;display:grid;gap:10px;align-content:start}
.adv>div+div{padding-left:24px;border-left:1px solid var(--line)}
.adv p{color:var(--muted)}
.adv .tag{font-family:var(--f-mono);font-size:.78rem;color:var(--muted)}
@media (max-width:760px){.adv{grid-template-columns:1fr}.adv>div+div{padding-left:0;border-left:0;border-top:1px solid var(--line)}}

/* 图片占位：Unsplash 图加载失败时显示渐变 */
.ph{position:relative;aspect-ratio:16/10;max-width:100%;border-radius:8px;overflow:hidden;background:
  radial-gradient(120% 90% at 85% 10%,color-mix(in srgb,var(--accent) 55%,transparent),transparent 55%),
  linear-gradient(135deg,var(--deep),color-mix(in srgb,var(--deep) 70%,#1d6b6e));}
.ph img{width:100%;height:100%;object-fit:cover}
.ph .ph-label{position:absolute;left:12px;bottom:10px;font-family:var(--f-mono);font-size:.75rem;color:#E9F1EE;opacity:.85}

/* 评价 */
.quote{display:flex;flex-direction:column;gap:16px}
.quote blockquote{margin:0;font-size:1.02rem;color:var(--ink)}
.quote footer{display:flex;align-items:center;gap:12px;margin-top:auto;font-size:.9rem;color:var(--muted)}
.avatar{width:38px;height:38px;border-radius:50%;background:var(--deep);color:var(--accent);display:grid;place-items:center;font-weight:700;flex:none}

/* 分栏 */
.split{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.split>*{min-width:0}
@media (max-width:860px){.split{grid-template-columns:1fr;gap:32px}}
.prose{display:grid;gap:16px}
.prose p{color:var(--muted);max-width:62ch}

/* 流程（真实顺序，使用编号） */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;counter-reset:s;list-style:none;padding:0;margin:0}
.steps li{counter-increment:s;border-top:2px solid var(--ink);padding-top:16px;display:grid;gap:8px}
.steps li::before{content:"步骤 " counter(s);font-family:var(--f-mono);font-size:.78rem;color:var(--muted)}
.steps p{color:var(--muted);font-size:.95rem}
@media (max-width:860px){.steps{grid-template-columns:repeat(2,1fr)}}
@media (max-width:520px){.steps{grid-template-columns:1fr}}

/* FAQ */
.faq{display:grid;gap:10px;max-width:820px}
.faq details{background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:4px 20px}
.faq summary{cursor:pointer;font-weight:600;padding:14px 0;list-style:none;display:flex;justify-content:space-between;gap:16px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-family:var(--f-mono);color:var(--muted)}
.faq details[open] summary::after{content:"−"}
.faq details p{color:var(--muted);padding-bottom:16px}

/* 底部 CTA */
.cta-band{background:var(--deep);color:var(--deep-ink);border-radius:14px;padding:clamp(32px,5vw,56px);display:grid;grid-template-columns:1fr auto;gap:28px;align-items:center}
.cta-band p{color:color-mix(in srgb,var(--deep-ink) 72%,transparent);margin-top:10px}
@media (max-width:760px){.cta-band{grid-template-columns:1fr}}

/* 筛选栏 */
.filters{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:28px;align-items:center}
.filter{border:1px solid var(--line);background:var(--surface);color:var(--ink);padding:8px 16px;border-radius:999px;cursor:pointer;font-size:.9rem;font-family:var(--f-body)}
.filter[aria-pressed="true"]{background:var(--ink);color:var(--bg);border-color:var(--ink)}
.search{margin-left:auto;min-width:0;flex:1 1 200px;max-width:280px;padding:9px 14px;border-radius:999px;border:1px solid var(--line);background:var(--surface);color:var(--ink);font:inherit;font-size:.9rem}
.listing-card{padding:0;overflow:hidden}
.listing-card .ph{border-radius:0}
.listing-card .body{padding:20px;display:grid;gap:10px}
.meta{display:flex;flex-wrap:wrap;gap:6px}
.pill{font-family:var(--f-mono);font-size:.72rem;padding:3px 8px;border-radius:4px;background:var(--bg);border:1px solid var(--line);color:var(--muted)}
.empty{padding:40px;text-align:center;color:var(--muted);border:1px dashed var(--line);border-radius:10px}

/* 表单 */
.form{display:grid;gap:16px}
.field{display:grid;gap:6px}
.field label{font-weight:600;font-size:.9rem}
.field input,.field select,.field textarea{font:inherit;padding:12px 14px;border:1px solid var(--line);border-radius:var(--r);background:var(--bg);color:var(--ink);width:100%}
.field textarea{min-height:130px;resize:vertical}
.form-note{font-size:.85rem;color:var(--muted)}
.toast{padding:12px 16px;border-radius:var(--r);background:color-mix(in srgb,var(--ok) 14%,transparent);color:var(--ink);border:1px solid color-mix(in srgb,var(--ok) 40%,transparent)}
.contact-line{display:flex;justify-content:space-between;align-items:center;gap:12px;padding-block:14px;border-bottom:1px solid var(--line);flex-wrap:wrap}
.contact-line span{color:var(--muted);font-size:.88rem}
.copy{font-size:.8rem;padding:6px 10px}

/* 下载卡 */
.dl{display:grid;gap:14px}
.dl .btn{justify-content:center}
.notice{font-size:.85rem;color:var(--muted);border-left:3px solid var(--accent);padding-left:12px}

/* Footer */
.site-footer{background:var(--deep);color:var(--deep-ink);padding-block:56px 28px;margin-top:0}
.foot{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:32px}
.foot h3{font-size:.85rem;font-family:var(--f-mono);text-transform:uppercase;letter-spacing:.1em;color:color-mix(in srgb,var(--deep-ink) 60%,transparent);margin-bottom:12px;font-weight:500}
.foot ul{list-style:none;margin:0;padding:0;display:grid;gap:8px}
.foot a{text-decoration:none;color:color-mix(in srgb,var(--deep-ink) 85%,transparent)}
.foot a:hover{color:var(--accent)}
.foot p{color:color-mix(in srgb,var(--deep-ink) 70%,transparent);font-size:.92rem;margin-top:12px;max-width:34ch}
.site-footer .logo-mark{background:var(--accent)}
.site-footer .logo-mark svg path{stroke:var(--accent-ink)}
.social{display:flex;gap:10px;margin-top:16px}
.social a{width:36px;height:36px;border-radius:8px;display:grid;place-items:center;border:1px solid color-mix(in srgb,var(--deep-ink) 22%,transparent)}
.social svg{width:16px;height:16px;fill:currentColor}
.legal{margin-top:40px;padding-top:20px;border-top:1px solid color-mix(in srgb,var(--deep-ink) 16%,transparent);display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;font-size:.82rem;color:color-mix(in srgb,var(--deep-ink) 60%,transparent)}
@media (max-width:820px){.foot{grid-template-columns:1fr 1fr}}
@media (max-width:480px){.foot{grid-template-columns:1fr}}

.reveal{animation:rise .6s ease both}
@keyframes rise{from{transform:translateY(10px)}to{transform:none}}