/* Music Keyboard · Official Site
   Brand: warm orange #FF9500 / ink #171512 / paper #F7F3ED */

@import url('https://fonts.googleapis.com/css2?family=DM+Sans:opsz,wght@9..40,400;9..40,500;9..40,600;9..40,700;9..40,800&family=Noto+Sans+SC:wght@400;500;700;900&display=swap');

:root{
  --orange:#ff9500;
  --orange-soft:#ffab2e;
  --ink:#171512;
  --ink-2:#1f1c18;
  --paper:#f7f3ed;
  --warm:#fff0dc;
  --white:#fff;
  --muted:#a9a39b;
  --dark-muted:#67615b;
  --line:#39342f;
  --pale-line:#ded7ce;
  --max:1280px;
  --pad:clamp(22px,5vw,72px);
  --radius:18px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:92px}
body{
  margin:0;background:var(--ink);color:var(--ink);
  font-family:'DM Sans','Noto Sans SC',system-ui,-apple-system,'PingFang SC',sans-serif;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;cursor:pointer;-webkit-tap-highlight-color:transparent}
::selection{background:var(--orange);color:var(--ink)}

/* ---------- shared primitives ---------- */
.wrap{max-width:var(--max);margin:0 auto;padding-left:var(--pad);padding-right:var(--pad)}
.section{padding:clamp(76px,9vw,140px) 0}
.paper{background:var(--paper)}
.ink{background:var(--ink);color:#fff}
.warm{background:var(--warm)}

.eyebrow{
  font-size:12px;font-weight:700;letter-spacing:2.4px;color:var(--dark-muted);
  display:flex;align-items:center;gap:12px;margin:0 0 26px;text-transform:uppercase;
}
.eyebrow::before{content:'';width:42px;height:4px;background:var(--orange);flex:0 0 42px}
.eyebrow.light{color:var(--muted)}

.section-heading{margin-bottom:clamp(48px,6vw,84px);max-width:880px}
.section-heading h2{
  font-size:clamp(38px,4.6vw,68px);line-height:1.16;letter-spacing:-.045em;
  margin:0;font-weight:900;
}
.section-heading h2 em{font-style:normal;color:var(--orange)}
.section-heading .lede{
  font-size:clamp(15px,1.3vw,18px);line-height:1.95;color:var(--dark-muted);
  max-width:640px;margin:26px 0 0;
}
.ink .section-heading .lede{color:var(--muted)}
.section-heading.center{margin-left:auto;margin-right:auto;text-align:center}
.section-heading.center .eyebrow{justify-content:center}
.section-heading.center .lede{margin-left:auto;margin-right:auto}

.button{
  display:inline-flex;align-items:center;justify-content:center;gap:12px;
  padding:16px 26px;border-radius:4px;font-size:14px;font-weight:700;
  border:0;transition:background .2s,color .2s,border-color .2s,transform .15s;
}
.button.primary{background:var(--orange);color:var(--ink)}
.button.primary:hover{background:var(--orange-soft)}
.button.primary:active{transform:translateY(1px)}
.button.ghost-dark{border:1px solid #57504a;color:#fff;background:transparent}
.button.ghost-dark:hover{border-color:var(--orange);color:var(--orange)}
.button.ghost-light{border:1px solid #cbc2b8;color:var(--ink);background:transparent}
.button.ghost-light:hover{border-color:var(--orange)}
.button .arr{color:var(--orange);font-weight:800}
.text-link{
  font-size:14px;font-weight:600;border-bottom:1px solid currentColor;
  padding-bottom:3px;color:inherit;opacity:.85;
}
.text-link:hover{color:var(--orange);opacity:1}

/* keycap chip —— 琴键元素 */
.keycap{
  display:inline-flex;align-items:center;justify-content:center;
  min-width:2em;padding:.28em .5em;border-radius:8px;
  background:linear-gradient(180deg,#fff,#e9e4dc);
  border:1px solid #c9c1b6;border-bottom-width:3px;
  color:var(--ink);font-weight:700;font-size:.92em;line-height:1;
}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:60;height:76px;
  background:rgba(23,21,18,.94);color:#fff;
  border-bottom:1px solid #322d28;backdrop-filter:blur(14px);
}
.site-header .wrap{height:100%;display:flex;align-items:center;justify-content:space-between;gap:20px}
.brand{display:flex;align-items:center;gap:12px;min-width:0}
.brand img{width:42px;height:42px;border-radius:10px;flex:0 0 42px}
.brand .brand-text{display:flex;flex-direction:column;gap:3px;white-space:nowrap}
.brand b{font-size:14px;font-weight:800;letter-spacing:1.6px}
.brand small{font-size:9px;font-weight:600;letter-spacing:2.2px;color:var(--muted)}
.site-nav{display:flex;align-items:center;gap:clamp(16px,2.4vw,36px);font-size:13.5px;font-weight:500}
.site-nav a{opacity:.85;transition:color .2s,opacity .2s;padding:6px 0}
.site-nav a:hover{opacity:1;color:var(--orange)}
.site-nav a.active{color:var(--orange);opacity:1}
.site-nav .nav-cta{
  border:1px solid #57504a;border-radius:100px;padding:10px 18px;opacity:1;
  display:inline-flex;align-items:center;gap:8px;font-weight:700;
}
.site-nav .nav-cta:hover{border-color:var(--orange);color:var(--orange)}
.nav-cta .dot{width:7px;height:7px;border-radius:50%;background:var(--orange)}
.menu-button{display:none;background:none;border:0;width:44px;height:44px;padding:11px}
.menu-button span{display:block;height:2px;background:#fff;margin:6px 0;border-radius:2px;transition:transform .25s,opacity .25s}
.menu-button[aria-expanded="true"] span:first-child{transform:translateY(4px) rotate(45deg)}
.menu-button[aria-expanded="true"] span:last-child{transform:translateY(-4px) rotate(-45deg)}

/* ---------- hero ---------- */
.hero{
  position:relative;overflow:hidden;color:#fff;
  background:
    radial-gradient(1100px 520px at 82% 8%,rgba(255,149,0,.13),transparent 60%),
    var(--ink);
  padding:clamp(64px,9vh,120px) 0 clamp(96px,12vh,150px);
}
.hero::before{content:'';position:absolute;left:0;top:0;bottom:0;width:12px;background:var(--orange)}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(40px,6vw,90px);align-items:center;position:relative}
.hero .eyebrow{margin-bottom:34px}
.hero h1{
  font-size:clamp(48px,6vw,96px);line-height:1.1;letter-spacing:-.05em;
  margin:0;font-weight:900;
}
.hero h1 em{font-style:normal;color:var(--orange)}
.hero .tagline-en{
  font-size:clamp(14px,1.4vw,21px);font-weight:800;letter-spacing:.05em;
  color:var(--orange);margin:28px 0 0;
}
.hero .hero-desc{
  font-size:clamp(15px,1.25vw,18px);line-height:1.95;color:var(--muted);
  max-width:560px;margin:22px 0 0;
}
.hero-actions{display:flex;flex-wrap:wrap;align-items:center;gap:16px 28px;margin-top:40px}
.hero-meta{
  display:flex;flex-wrap:wrap;gap:12px 28px;margin-top:56px;
  font-size:10.5px;letter-spacing:1.8px;color:#7c746c;font-weight:600;
}
.hero-meta span{display:inline-flex;align-items:center;gap:9px}
.hero-meta i{width:5px;height:5px;border-radius:50%;background:var(--orange);flex:0 0 5px}

.hero-visual{position:relative;min-height:560px;display:flex;align-items:flex-end;justify-content:center}
.hero-chord{
  position:absolute;top:-30px;left:-8px;z-index:3;pointer-events:none;
  font-size:clamp(130px,13vw,210px);line-height:1;font-weight:800;color:var(--orange);
}
.hero-phone{
  position:relative;z-index:2;width:min(300px,72%);
  border:2px solid #4a433b;border-radius:30px;
  box-shadow:0 30px 80px rgba(0,0,0,.6);transform:rotate(2deg);
}
.hero-note{
  position:absolute;z-index:4;left:-10px;bottom:64px;
  display:flex;align-items:center;gap:14px;
  background:var(--paper);color:var(--ink);
  padding:16px 20px;border-left:5px solid var(--orange);
  box-shadow:0 16px 44px rgba(0,0,0,.4);
}
.hero-note b{font-size:42px;line-height:1;font-weight:800}
.hero-note span{font-size:11.5px;font-weight:700;line-height:1.6}

/* ---------- proof strip ---------- */
.proof-strip{background:var(--orange);color:var(--ink)}
.proof-strip .wrap{
  display:grid;grid-template-columns:repeat(5,1fr);gap:20px;
  padding-top:30px;padding-bottom:30px;
}
.proof-strip div{display:flex;align-items:center;gap:14px;border-right:1px solid rgba(23,21,18,.22);padding-right:14px}
.proof-strip div:last-child{border-right:0;padding-right:0}
.proof-strip strong{font-size:clamp(30px,3.2vw,50px);letter-spacing:-.05em;font-weight:800;line-height:1}
.proof-strip span{font-size:12px;font-weight:700;line-height:1.55}

/* ---------- intro ---------- */
.intro-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(40px,6vw,90px);align-items:start}
.intro-main h3{font-size:clamp(28px,2.9vw,44px);line-height:1.32;letter-spacing:-.035em;margin:0 0 22px;font-weight:800}
.intro-main h3 em{font-style:normal;color:var(--orange)}
.intro-main p{font-size:16px;line-height:2;color:var(--dark-muted);margin:0 0 18px}
.intro-facts{
  margin-top:34px;border-top:1px solid var(--pale-line);
  display:grid;grid-template-columns:repeat(3,1fr);
}
.intro-facts div{padding:20px 20px 4px 0;border-right:1px solid var(--pale-line)}
.intro-facts div:last-child{border-right:0}
.intro-facts b{display:block;font-size:26px;font-weight:800;letter-spacing:-.03em}
.intro-facts span{font-size:12px;font-weight:600;color:var(--dark-muted);line-height:1.6;display:block;margin-top:6px}
.principles{display:flex;flex-direction:column;border-top:1px solid var(--pale-line)}
.principles article{display:flex;gap:22px;padding:26px 0;border-bottom:1px solid var(--pale-line)}
.principles article>span{font-size:12px;font-weight:800;color:var(--orange);flex:0 0 30px;padding-top:4px}
.principles h4{margin:0 0 8px;font-size:19px;font-weight:800}
.principles p{margin:0;font-size:14px;line-height:1.85;color:var(--dark-muted)}

.not-piano{
  margin-top:clamp(48px,6vw,72px);
  border:1px solid var(--pale-line);background:var(--white);
  display:flex;gap:18px;align-items:flex-start;padding:24px 26px;
}
.not-piano i{flex:0 0 8px;align-self:stretch;background:var(--orange)}
.not-piano p{margin:0;font-size:14.5px;line-height:1.9;color:var(--dark-muted)}
.not-piano b{color:var(--ink)}

/* ---------- interactive demo ---------- */
.demo-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:clamp(40px,6vw,90px);align-items:start}
.demo-steps{display:flex;flex-direction:column;gap:0;border-top:1px solid var(--line);margin-top:10px}
.demo-steps article{display:flex;gap:20px;padding:22px 0;border-bottom:1px solid var(--line)}
.demo-steps .no{font-size:12px;font-weight:800;color:var(--orange);flex:0 0 28px;padding-top:3px}
.demo-steps h4{margin:0 0 7px;font-size:17px;font-weight:700;color:#fff}
.demo-steps p{margin:0;font-size:13.5px;line-height:1.8;color:var(--muted)}
.demo-disclaimer{
  margin-top:22px;font-size:12px;line-height:1.8;color:#8d867f;
  border-left:3px solid var(--orange);padding:4px 0 4px 14px;
}

.demo-card{
  background:var(--ink-2);border:1px solid var(--line);border-radius:var(--radius);
  padding:clamp(22px,3vw,34px);box-shadow:0 24px 60px rgba(0,0,0,.35);
}
.demo-top{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}
.demo-kicker{font-size:10px;letter-spacing:2px;color:var(--muted);font-weight:700}
.demo-chord{
  font-size:clamp(64px,6vw,92px);line-height:1;font-weight:800;color:var(--orange);
  letter-spacing:-.03em;min-height:1em;transition:transform .12s;
}
.demo-chord.hit{transform:scale(1.06)}
.demo-chord-name{font-size:12px;color:var(--muted);font-weight:600;margin-top:4px;min-height:1.4em}
.demo-pads{
  margin-top:26px;display:grid;grid-template-columns:repeat(3,1fr);gap:12px;
}
.pad{
  appearance:none;border:1px solid #46403a;background:#262219;color:#efece7;
  border-radius:12px;padding:14px 8px 12px;display:flex;flex-direction:column;
  align-items:center;gap:7px;transition:background .15s,border-color .15s,transform .1s;
}
.pad b{font-size:19px;font-weight:700;line-height:1}
.pad .key{
  font-size:10px;font-weight:700;letter-spacing:1px;color:#8f8880;
  border:1px solid #4a443d;border-radius:5px;padding:3px 7px;
}
.pad:hover{border-color:#6b6259}
.pad.active{background:var(--orange);border-color:var(--orange);color:var(--ink)}
.pad.active .key{color:rgba(23,21,18,.75);border-color:rgba(23,21,18,.35)}

.demo-strings{
  margin-top:26px;border:1px solid #46403a;border-radius:14px;background:#211d17;
  padding:18px 18px 8px;touch-action:pan-y;
}
.strings{display:grid;grid-template-columns:repeat(6,1fr);gap:0;height:86px}
.string{position:relative}
.string::before{
  content:'';position:absolute;left:50%;top:0;bottom:0;width:2px;
  transform:translateX(-50%);background:#57504a;border-radius:2px;
  transition:background .18s,box-shadow .18s;
}
.string.pluck::before{background:var(--orange);box-shadow:0 0 14px rgba(255,149,0,.8)}
.demo-strings-hint{
  display:flex;align-items:center;justify-content:center;gap:10px;
  padding:10px 0 12px;font-size:11.5px;color:#8f8880;font-weight:600;
}
.demo-strings-hint i{width:6px;height:6px;border-radius:50%;background:var(--orange);animation:pulse 1.6s infinite}
@keyframes pulse{0%,100%{opacity:.35}50%{opacity:1}}
.demo-actions{display:flex;gap:12px;margin-top:22px;flex-wrap:wrap}
.strum-btn{
  flex:1;appearance:none;border:0;border-radius:12px;background:var(--orange);color:var(--ink);
  font-weight:800;font-size:14px;padding:14px 10px;transition:background .15s,transform .1s;
}
.strum-btn:hover{background:var(--orange-soft)}
.strum-btn:active{transform:translateY(1px)}
.strum-btn small{display:block;font-size:10px;font-weight:600;opacity:.7;margin-top:3px;letter-spacing:.5px}

/* ---------- features ---------- */
.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--pale-line);border:1px solid var(--pale-line)}
.feature-grid article{background:var(--paper);padding:32px 28px 30px;display:flex;flex-direction:column;min-height:280px;transition:background .2s}
.feature-grid article:hover{background:var(--white)}
.feature-grid .fno{font-size:11px;font-weight:800;letter-spacing:1.5px;color:var(--orange)}
.feature-grid h3{font-size:21px;margin:30px 0 12px;font-weight:800;letter-spacing:-.02em}
.feature-grid p{font-size:13.5px;line-height:1.85;color:var(--dark-muted);margin:0}
.feature-grid .fquote{
  margin-top:auto;padding-top:22px;font-size:12px;font-weight:700;color:var(--ink);
  border-top:1px dashed var(--pale-line);
}
.feature-grid .fquote::before{content:'“';color:var(--orange);font-size:15px}
.feature-grid .fquote::after{content:'”';color:var(--orange);font-size:15px}

/* ---------- UI showcase ---------- */
.ui-grid{display:grid;grid-template-columns:.92fr 1.08fr;gap:clamp(40px,6vw,90px);align-items:center}
.ui-stage{
  position:relative;background:#24201b;border-radius:22px;min-height:620px;
  display:flex;align-items:center;justify-content:center;padding:36px;overflow:hidden;
}
.ui-stage::before{content:'';position:absolute;left:0;top:0;bottom:0;width:7px;background:var(--orange)}
.ui-stage img{height:min(66vw,600px);width:auto;border-radius:24px;border:1px solid #46403a;box-shadow:0 24px 60px rgba(0,0,0,.5)}
.ui-stage .ui-counter{
  position:absolute;right:24px;bottom:18px;font-size:11px;letter-spacing:1.6px;
  color:var(--muted);font-weight:700;
}
.ui-details h3{font-size:clamp(28px,3.2vw,46px);line-height:1.28;letter-spacing:-.04em;margin:0 0 22px;font-weight:800}
.ui-details .ui-desc{font-size:15.5px;line-height:1.95;color:var(--muted);max-width:560px;margin:0}
.ui-details blockquote{
  font-size:20px;line-height:1.65;font-weight:700;color:#fff;
  margin:36px 0;padding:20px 0 20px 22px;border-left:5px solid var(--orange);
}
.ui-tabs{border-top:1px solid var(--line)}
.ui-tabs button{
  width:100%;display:flex;align-items:center;gap:22px;background:none;border:0;
  border-bottom:1px solid var(--line);padding:16px 4px;text-align:left;
  font-size:15px;color:var(--muted);transition:color .2s,padding .2s;
}
.ui-tabs button .tno{font-size:11px;color:var(--dark-muted);font-weight:700}
.ui-tabs button:hover{color:#d8d3cc}
.ui-tabs button.active{color:#fff;font-weight:800;padding-left:16px}
.ui-tabs button.active .tno{color:var(--orange)}

/* ---------- FAQ ---------- */
.faq-list{border-top:1px solid var(--pale-line);max-width:860px}
.faq-item{border-bottom:1px solid var(--pale-line)}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:20px;
  background:none;border:0;text-align:left;padding:24px 4px;
  font-size:17px;font-weight:700;color:var(--ink);
}
.faq-q i{font-style:normal;font-size:22px;font-weight:300;color:var(--orange);transition:transform .2s;flex:0 0 auto}
.faq-item.open .faq-q i{transform:rotate(45deg)}
.faq-a{display:none;padding:0 44px 26px 4px;font-size:14.5px;line-height:1.95;color:var(--dark-muted)}
.faq-item.open .faq-a{display:block}
.faq-a b{color:var(--ink)}

/* ---------- CTA band ---------- */
.cta-band{background:var(--orange);color:var(--ink);text-align:center}
.cta-band h2{font-size:clamp(36px,4.6vw,64px);letter-spacing:-.045em;line-height:1.18;margin:0;font-weight:900}
.cta-band p{font-size:16px;line-height:1.9;margin:20px auto 0;max-width:560px;font-weight:600;color:#4a3110;text-wrap:balance}
.cta-band .cta-actions{display:flex;justify-content:center;gap:16px;flex-wrap:wrap;margin-top:36px}
.cta-band .button.dark{background:var(--ink);color:#fff}
.cta-band .button.dark:hover{background:#000}
.cta-band .button.outline{border:1.5px solid var(--ink);color:var(--ink);background:transparent}
.cta-band .button.outline:hover{background:rgba(23,21,18,.08)}

/* ---------- download page ---------- */
.dl-hero{
  position:relative;overflow:hidden;color:#fff;text-align:center;
  background:
    radial-gradient(900px 460px at 50% -10%,rgba(255,149,0,.16),transparent 62%),
    var(--ink);
  padding:clamp(70px,10vh,130px) 0 clamp(70px,10vh,120px);
}
.dl-hero::before{content:'';position:absolute;left:0;top:0;bottom:0;width:12px;background:var(--orange)}
.dl-hero .eyebrow{justify-content:center}
.dl-hero h1{font-size:clamp(44px,5.6vw,84px);letter-spacing:-.05em;line-height:1.12;margin:0;font-weight:900}
.dl-hero h1 em{font-style:normal;color:var(--orange)}
.dl-hero p{color:var(--muted);font-size:clamp(15px,1.3vw,18px);line-height:1.95;max-width:560px;margin:24px auto 0}

.store-card{
  background:var(--white);border:1px solid var(--pale-line);border-radius:22px;
  max-width:760px;margin:-56px auto 0;position:relative;z-index:2;
  padding:clamp(28px,4vw,46px);box-shadow:0 30px 70px rgba(23,21,18,.18);
  display:flex;flex-direction:column;align-items:center;gap:26px;text-align:center;
}
.store-buttons{display:flex;gap:16px;flex-wrap:wrap;justify-content:center}
.store-btn{
  display:inline-flex;align-items:center;gap:14px;border-radius:14px;
  padding:14px 26px;text-align:left;border:1.5px solid var(--ink);
  background:var(--ink);color:#fff;transition:transform .15s,opacity .2s;
}
.store-btn:hover{transform:translateY(-2px)}
.store-btn svg{width:30px;height:30px;flex:0 0 30px;fill:currentColor}
.store-btn .st small{display:block;font-size:10px;letter-spacing:1.2px;opacity:.65;font-weight:600}
.store-btn .st b{display:block;font-size:17px;font-weight:700;line-height:1.3}
.store-btn.secondary{background:transparent;color:var(--ink)}
.store-note{font-size:12px;line-height:1.8;color:var(--dark-muted);max-width:520px}
.store-note b{color:var(--ink)}

.req-grid{
  display:grid;grid-template-columns:repeat(4,1fr);gap:1px;
  background:var(--pale-line);border:1px solid var(--pale-line);margin-top:clamp(48px,6vw,80px);
}
.req-grid div{background:var(--white);padding:24px 22px}
.req-grid dt{font-size:10.5px;font-weight:800;letter-spacing:1.8px;color:var(--orange);margin:0 0 12px}
.req-grid dd{margin:0;font-size:14.5px;font-weight:700;line-height:1.7}
.req-grid dd small{display:block;font-weight:500;color:var(--dark-muted);font-size:12px;margin-top:6px;line-height:1.7}

.quickstart{display:grid;grid-template-columns:repeat(4,1fr);gap:clamp(20px,3vw,40px);margin-top:10px}
.quickstart article{border-top:3px solid var(--orange);padding-top:22px}
.quickstart .qno{font-size:11px;font-weight:800;letter-spacing:2px;color:var(--dark-muted)}
.quickstart h3{font-size:20px;margin:14px 0 10px;font-weight:800}
.quickstart p{font-size:13.5px;line-height:1.9;color:var(--dark-muted);margin:0}
.quickstart .keys{margin-top:14px;display:flex;gap:6px;flex-wrap:wrap}

.support-row{
  margin-top:clamp(56px,7vw,90px);display:grid;grid-template-columns:1fr 1fr;
  border:1px solid var(--pale-line);
}
.support-row a{padding:28px 30px;display:flex;align-items:center;justify-content:space-between;gap:18px;transition:background .2s}
.support-row a:first-child{border-right:1px solid var(--pale-line)}
.support-row a:hover{background:var(--white)}
.support-row b{font-size:17px;font-weight:800}
.support-row small{display:block;font-size:12.5px;color:var(--dark-muted);margin-top:6px;font-weight:500}
.support-row span{color:var(--orange);font-weight:800}

/* ---------- privacy ---------- */
.policy-head{
  background:var(--ink);color:#fff;padding:clamp(60px,8vh,110px) 0 clamp(50px,7vh,90px);position:relative;overflow:hidden;
}
.policy-head::before{content:'';position:absolute;left:0;top:0;bottom:0;width:12px;background:var(--orange)}
.policy-head .eyebrow{color:var(--muted)}
.policy-head h1{font-size:clamp(40px,5vw,72px);letter-spacing:-.05em;margin:0;font-weight:900}
.policy-head .meta{margin-top:22px;color:var(--muted);font-size:13px;line-height:1.9}
.policy-body{max-width:840px}
.policy-body h2{
  font-size:22px;font-weight:800;margin:52px 0 16px;padding-top:26px;
  border-top:1px solid var(--pale-line);letter-spacing:-.02em;
}
.policy-body h2:first-of-type{border-top:0;margin-top:0;padding-top:0}
.policy-body h2 .hno{color:var(--orange);font-size:12px;letter-spacing:2px;display:block;margin-bottom:10px;font-weight:800}
.policy-body p,.policy-body li{font-size:15px;line-height:2.05;color:#4b453f}
.policy-body ul{padding-left:22px;margin:14px 0}
.policy-body li{margin-bottom:10px}
.policy-body b{color:var(--ink)}
.policy-body .callout{
  background:var(--warm);border:1px solid #ecd9ba;border-radius:14px;
  padding:20px 24px;margin:26px 0;font-size:14px;line-height:1.9;color:#4b453f;
}
.policy-toc{
  background:var(--white);border:1px solid var(--pale-line);border-radius:16px;
  padding:26px 28px;margin-bottom:14px;
}
.policy-toc b{display:block;font-size:11px;letter-spacing:2px;color:var(--dark-muted);margin-bottom:14px}
.policy-toc ol{margin:0;padding-left:20px;font-size:14px;line-height:2.1;color:var(--dark-muted)}
.policy-toc a:hover{color:var(--orange)}

/* ---------- 404 ---------- */
.nf-hero{min-height:70vh;display:flex;align-items:center;position:relative;overflow:hidden;color:#fff}
.nf-hero::before{content:'';position:absolute;left:0;top:0;bottom:0;width:12px;background:var(--orange)}
.nf-code{font-size:clamp(110px,18vw,220px);font-weight:800;letter-spacing:-.06em;color:var(--orange);line-height:1;margin:0}
.nf-hero h1{font-size:clamp(24px,3vw,38px);margin:18px 0 0;font-weight:800}
.nf-hero p{color:var(--muted);margin:16px 0 34px;font-size:15px;line-height:1.9}

/* ---------- footer ---------- */
.site-footer{background:var(--ink);color:#fff;border-top:1px solid var(--line)}
.site-footer .top{display:flex;gap:40px;align-items:flex-start;justify-content:space-between;padding:56px 0 40px;flex-wrap:wrap}
.footer-brand{display:flex;align-items:center;gap:14px}
.footer-brand img{width:46px;height:46px;border-radius:11px}
.footer-brand .fb-text{display:flex;flex-direction:column;gap:5px}
.footer-brand b{font-size:13px;letter-spacing:1.6px;font-weight:800}
.footer-brand small{font-size:11.5px;color:var(--muted)}
.footer-nav{display:flex;gap:clamp(24px,4vw,60px);flex-wrap:wrap}
.footer-nav .col{display:flex;flex-direction:column;gap:12px;min-width:120px}
.footer-nav .col b{font-size:10px;letter-spacing:2px;color:var(--dark-muted);font-weight:700}
.footer-nav .col a{font-size:13px;color:var(--muted);transition:color .2s}
.footer-nav .col a:hover{color:var(--orange)}
.site-footer .bottom{
  border-top:1px solid var(--line);padding:24px 0 30px;
  display:flex;gap:14px 30px;flex-wrap:wrap;align-items:center;justify-content:space-between;
  font-size:11px;color:#7c746c;line-height:1.8;
}
.site-footer .bottom a{color:var(--muted)}
.site-footer .bottom a:hover{color:var(--orange)}

/* ---------- toast ---------- */
.toast{
  position:fixed;left:50%;bottom:32px;z-index:120;transform:translate(-50%,16px);
  background:var(--orange);color:var(--ink);font-size:13px;font-weight:700;
  padding:13px 22px;border-radius:6px;opacity:0;pointer-events:none;
  transition:opacity .25s,transform .25s;box-shadow:0 12px 34px rgba(0,0,0,.28);
}
.toast.show{opacity:1;transform:translate(-50%,0)}

/* ---------- responsive ---------- */
@media(min-width:1500px){
  :root{--max:1360px}
}
@media(max-width:1060px){
  .hero-grid,.intro-grid,.demo-grid,.ui-grid{grid-template-columns:1fr}
  .hero-visual{min-height:520px;margin-top:10px}
  .hero-chord{top:-16px}
  .feature-grid{grid-template-columns:repeat(2,1fr)}
  .req-grid{grid-template-columns:repeat(2,1fr)}
  .quickstart{grid-template-columns:repeat(2,1fr);gap:36px 28px}
  .proof-strip .wrap{grid-template-columns:repeat(3,1fr)}
  .proof-strip div:nth-child(3){border-right:0}
}
@media(max-width:820px){
  html{scroll-padding-top:80px}
  .site-header{height:66px}
  .brand img{width:38px;height:38px}
  .menu-button{display:block}
  .site-nav{
    display:none;position:absolute;top:66px;left:0;right:0;
    background:var(--ink);border-bottom:1px solid var(--line);
    padding:18px var(--pad) 26px;flex-direction:column;align-items:stretch;gap:0;
  }
  .site-nav.open{display:flex}
  .site-nav a{padding:14px 0;font-size:15px;border-bottom:1px solid #262119;opacity:1}
  .site-nav .nav-cta{margin-top:16px;justify-content:center;border-bottom:0}
  .ui-stage{min-height:520px}
  .support-row{grid-template-columns:1fr}
  .support-row a:first-child{border-right:0;border-bottom:1px solid var(--pale-line)}
}
@media(max-width:600px){
  .proof-strip .wrap{grid-template-columns:repeat(2,1fr);padding-top:24px;padding-bottom:24px}
  .proof-strip div{border-right:0;padding-right:0}
  .hero-note{left:0;bottom:40px;padding:12px 15px}
  .hero-note b{font-size:32px}
  .hero-chord{left:4px;top:-8px}
  .intro-facts{grid-template-columns:1fr 1fr}
  .intro-facts div:nth-child(3){border-right:0}
  .feature-grid{grid-template-columns:1fr}
  .feature-grid article{min-height:0}
  .req-grid{grid-template-columns:1fr}
  .quickstart{grid-template-columns:1fr}
  .demo-pads{gap:9px}
  .pad b{font-size:16px}
  .ui-stage{padding:22px;min-height:480px}
  .ui-stage img{height:min(72vw,430px)}
  .faq-a{padding-right:8px}
  .store-card{margin-top:-44px}
  .store-btn{flex:1 1 100%;justify-content:center}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{transition:none!important;animation:none!important}
}