/* ===== YINJA AUDIO · 音频科技公司官网 ===== */
@font-face{
  font-family:"Inter";
  font-style:normal;
  font-weight:400;
  font-display:swap;
  src:url("../fonts/inter-latin-400-normal.woff2") format("woff2");
}
@font-face{
  font-family:"Inter";
  font-style:normal;
  font-weight:500;
  font-display:swap;
  src:url("../fonts/inter-latin-500-normal.woff2") format("woff2");
}
@font-face{
  font-family:"Inter";
  font-style:normal;
  font-weight:600;
  font-display:swap;
  src:url("../fonts/inter-latin-600-normal.woff2") format("woff2");
}
@font-face{
  font-family:"Inter";
  font-style:normal;
  font-weight:700;
  font-display:swap;
  src:url("../fonts/inter-latin-700-normal.woff2") format("woff2");
}
:root{
  --bg:#FFFFFF;
  --bg-2:#F5F5F7;
  --bg-3:#EDEDF0;
  --ink:#1D1D1F;
  --muted:#6E6E73;
  --faint:#86868B;
  --accent:#0071E3;
  --accent-2:#0077ED;
  --line:rgba(0,0,0,.10);
  --card-shadow:0 1px 2px rgba(0,0,0,.04),0 6px 20px rgba(0,0,0,.06);
  --card-shadow-lg:0 2px 4px rgba(0,0,0,.05),0 16px 40px rgba(0,0,0,.12);
  --font:"Inter","SF Pro Display","SF Pro Text","-apple-system","BlinkMacSystemFont","Helvetica Neue","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",sans-serif;
  --maxw:1180px;
  --pad:clamp(4.5rem,8vw,7.5rem);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
html,body{background:var(--bg);color:var(--ink);font-family:var(--font);font-size:17px;line-height:1.55;font-weight:400;letter-spacing:-.008em;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
body{overflow-x:hidden}
::selection{background:var(--accent);color:#fff}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px}
a{color:inherit;text-decoration:none}
img,canvas{max-width:100%;display:block}
.container{max-width:var(--maxw);margin:0 auto;padding:0 clamp(1.25rem,4vw,2.5rem)}
.eyebrow{font-size:.84rem;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);font-weight:500;margin-bottom:1.3rem}
h1,h2,h3{line-height:1.1;letter-spacing:-.022em;text-wrap:balance;font-weight:700}
h1{font-size:clamp(2.4rem,5.2vw,4rem);font-weight:700;margin-bottom:1.4rem}
h2{font-size:clamp(1.9rem,3.8vw,2.75rem);font-weight:700;margin-bottom:1rem}
h3{font-size:1.32rem;font-weight:600;letter-spacing:-.015em}
.section-lead{color:var(--muted);max-width:60ch;font-size:1.06rem;font-weight:400;letter-spacing:-.01em}

/* ---------- Nav ---------- */
.nav{position:fixed;top:0;left:0;right:0;z-index:60;background:rgba(255,255,255,.92);border-bottom:1px solid var(--line);backdrop-filter:saturate(180%) blur(20px)}
.nav-inner{max-width:var(--maxw);margin:0 auto;padding:.8rem clamp(1.25rem,4vw,2.5rem);display:flex;align-items:center;justify-content:space-between;gap:1.5rem}
.logo{display:flex;align-items:center;gap:.6rem;font-weight:700;font-size:1.05rem;letter-spacing:-.01em}
.logo img{height:1.5rem;width:auto}
.nav-links{display:flex;align-items:center;gap:1.7rem}
.nav-links a{font-size:.93rem;color:var(--muted);transition:color .2s;padding:.25rem 0}
.nav-links a:hover{color:var(--ink)}
.nav-links a.active{color:var(--ink);font-weight:600}
.btn{display:inline-flex;align-items:center;justify-content:center;background:var(--accent);color:#fff;font-weight:600;font-size:.95rem;padding:.66rem 1.4rem;border-radius:980px;transition:background .2s,transform .2s;min-height:48px;border:none;cursor:pointer;text-align:center}
.btn:hover{background:var(--accent-2)}
.btn:active{transform:scale(.97)}
.btn.ghost{background:transparent;color:var(--ink);border:1px solid var(--line)}
.btn.ghost:hover{background:var(--bg-2)}
.btn.lg{padding:.85rem 1.9rem;font-size:1.02rem}
.nav-toggle{display:none;background:none;border:none;color:var(--ink);cursor:pointer;padding:0;min-width:48px;min-height:48px;align-items:center;justify-content:center}

/* ---------- Hero ---------- */
.hero{position:relative;padding:calc(6.5rem + 3vh) 0 var(--pad);background:var(--bg)}
.hero-grid{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,.9fr);gap:4rem;align-items:center}
.hero-sub{color:var(--muted);font-size:1.13rem;max-width:54ch;margin-bottom:2.4rem}
.hero-cta{display:flex;gap:1rem;flex-wrap:wrap;margin-bottom:3.2rem}
.hero-proof{display:flex;flex-wrap:wrap;gap:2.6rem;border-top:1px solid var(--line);padding-top:1.9rem}
.proof-item .num{font-weight:700;font-size:1.42rem;color:var(--ink);letter-spacing:-.01em}
.proof-item .lab{font-size:.84rem;color:var(--faint);margin-top:.2rem}
.hero-visual{display:flex;justify-content:center;align-items:center}

/* ---------- Sections ---------- */
.section{padding:var(--pad) 0;position:relative}
.section.alt{background:var(--bg-2)}
.section.head{border-top:1px solid var(--line)}
.section-head{display:flex;align-items:baseline;justify-content:space-between;gap:2.5rem;margin-bottom:3rem}
.section-head .num{font-size:.9rem;color:var(--faint);font-weight:600;white-space:nowrap;letter-spacing:.04em}

/* ---------- 波形可视化 ---------- */
.wave-visual{position:relative;width:100%;max-width:430px;margin:0 auto;background:linear-gradient(160deg,#f7f7f9 0%,#ffffff 100%);border:1px solid var(--line);border-radius:28px;padding:clamp(2.2rem,4vw,3.2rem) 2.2rem;box-shadow:var(--card-shadow-lg);display:flex;flex-direction:column;align-items:center;gap:2rem}
.wave-bars{display:flex;align-items:center;justify-content:center;gap:9px;height:150px;width:100%}
.wave-bars i{width:16px;border-radius:8px;background:linear-gradient(180deg,#7c3aed 0%,#0071E3 100%);transform-origin:center;animation:wavebar 1.4s ease-in-out infinite;box-shadow:0 4px 12px rgba(124,58,237,.28)}
@keyframes wavebar{0%,100%{transform:scaleY(.28)}50%{transform:scaleY(1)}}
.wave-caption{display:flex;align-items:center;gap:.55rem;font-size:.92rem;color:var(--muted);font-weight:500}
.wave-dot{width:9px;height:9px;border-radius:50%;background:#0a8f5b;box-shadow:0 0 0 4px rgba(10,143,91,.14);animation:pulse 1.6s ease-in-out infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.4}}
@media(prefers-reduced-motion:reduce){.wave-bars i{animation:none;transform:scaleY(1)}.wave-dot{animation:none}}

/* ---------- 手机 mockup ---------- */
.phones{display:flex;gap:clamp(1.4rem,3vw,2.6rem);align-items:flex-end;justify-content:center}
.phone{width:min(248px,68vw);flex:none}
.phone-frame{position:relative;border-radius:42px;background:#101014;padding:11px;box-shadow:0 28px 56px -22px rgba(0,0,0,.4),0 0 0 1px rgba(255,255,255,.08) inset}
.phone-frame::before{content:"";position:absolute;top:12px;left:50%;transform:translateX(-50%);width:108px;height:24px;background:#101014;border-radius:0 0 14px 14px;z-index:3}
.phone-screen{position:relative;border-radius:32px;overflow:hidden;background:#fff;aspect-ratio:9/19}
.phone-screen img{width:100%;height:100%;object-fit:cover;object-position:top center}
.phone .phone-cap{text-align:center;color:var(--muted);font-size:.82rem;margin-top:1rem}

/* ---------- 浏览器窗口 mockup（横屏） ---------- */
.browser-frame{border-radius:16px;overflow:hidden;border:1px solid var(--line);box-shadow:var(--card-shadow-lg);background:#fff;width:100%}
.browser-bar{display:flex;align-items:center;gap:7px;padding:11px 15px;border-bottom:1px solid var(--line);background:#fafafa}
.browser-bar .dot{width:11px;height:11px;border-radius:50%}
.browser-bar .dot.r{background:#ff5f57}.browser-bar .dot.y{background:#febc2e}.browser-bar .dot.g{background:#28c840}
.browser-bar .url{flex:1;margin-left:8px;font-size:.78rem;color:var(--faint);background:var(--bg);border:1px solid var(--line);border-radius:6px;padding:.28rem .7rem;overflow:hidden;white-space:nowrap}
.browser-frame img{width:100%;display:block}

/* ---------- 卡片 ---------- */
.feat-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1.5rem}
.feat{background:var(--bg);border:1px solid var(--line);border-radius:18px;padding:2.2rem 2rem;display:flex;flex-direction:column;gap:.9rem;box-shadow:var(--card-shadow);transition:transform .25s,box-shadow .25s}
.feat:hover{transform:translateY(-3px);box-shadow:var(--card-shadow-lg)}
.feat .idx{font-size:.84rem;font-weight:600;color:var(--accent);letter-spacing:.08em}
.feat h3{font-size:1.24rem;margin:0}
.feat p{color:var(--muted);font-size:.98rem}
.svc-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1.5rem}
.svc{background:var(--bg);border:1px solid var(--line);border-radius:18px;padding:2.3rem 2.1rem;display:flex;flex-direction:column;gap:.95rem;min-height:15rem;box-shadow:var(--card-shadow);transition:transform .25s,box-shadow .25s}
.svc:hover{transform:translateY(-3px);box-shadow:var(--card-shadow-lg)}
.svc .idx{font-size:.84rem;font-weight:600;color:var(--accent);letter-spacing:.08em}
.svc h3{font-size:1.28rem;margin:0}
.svc p{color:var(--muted);font-size:.97rem}
.svc .tags{display:flex;flex-wrap:wrap;gap:.5rem;margin-top:auto;padding-top:.6rem}
.svc .tag{font-size:.8rem;color:var(--muted);background:var(--bg-2);border-radius:999px;padding:.32rem .8rem}

/* ---------- 合作双卡 ---------- */
.partner-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1.6rem}
.partner{background:var(--bg);border:1px solid var(--line);border-radius:22px;padding:2.8rem 2.5rem;box-shadow:var(--card-shadow);display:flex;flex-direction:column;gap:1.1rem;transition:transform .25s,box-shadow .25s}
.partner:hover{transform:translateY(-4px);box-shadow:var(--card-shadow-lg)}
.partner .badge{display:inline-block;font-size:.8rem;font-weight:600;color:var(--accent);background:var(--bg-2);border:1px solid var(--line);border-radius:999px;padding:.34rem .9rem;letter-spacing:.02em;width:fit-content}
.partner h3{font-size:1.75rem;font-weight:800}
.partner p{color:var(--muted)}
.partner .cta-row{margin-top:auto;padding-top:1.2rem}

/* ---------- 申请 CTA 区 ---------- */
.apply-hero{text-align:center;max-width:680px;margin:0 auto}
.apply-hero .btn{margin-top:2.2rem}
.points{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1.5rem;margin-top:3.5rem}
.point{background:var(--bg);border:1px solid var(--line);border-radius:16px;padding:1.9rem 1.6rem;box-shadow:var(--card-shadow)}
.point h3{font-size:1.08rem;margin-bottom:.5rem}
.point p{color:var(--muted);font-size:.92rem}

/* ---------- 表单（模态框内） ---------- */
.form-group{margin-bottom:1.35rem}
.form-group label{display:block;font-size:.92rem;font-weight:600;margin-bottom:.5rem}
.form-group label .req{color:#c0392b}
.form-group .hint{font-size:.8rem;color:var(--faint);margin-top:.35rem}
.form-group input[type=text],.form-group input[type=tel],.form-group textarea,.form-group select{width:100%;padding:.78rem .95rem;border:1px solid var(--line);border-radius:10px;font-size:1rem;font-family:inherit;background:var(--bg);color:var(--ink)}
.form-group input:focus,.form-group textarea:focus,.form-group select:focus{outline:2px solid var(--accent);outline-offset:-1px;border-color:var(--accent)}
.form-group textarea{resize:vertical;min-height:96px}
.radio-row{display:flex;gap:.6rem;flex-wrap:wrap}
.radio-pill{flex:1;min-width:96px}
.radio-pill input{position:absolute;opacity:0;pointer-events:none}
.radio-pill span{display:flex;align-items:center;justify-content:center;padding:.7rem .5rem;border:1px solid var(--line);border-radius:10px;font-size:.94rem;cursor:pointer;transition:.15s;text-align:center;color:var(--muted);min-height:48px}
.radio-pill input:checked + span{border-color:var(--accent);color:var(--accent);background:rgba(0,113,227,.05);font-weight:600}
.captcha-row{display:flex;gap:.8rem;align-items:center}
.captcha-row input{flex:1}
.captcha-row img{height:48px;border:1px solid var(--line);border-radius:8px;cursor:pointer;flex:none}
.form-msg{text-align:center;padding:.9rem;border-radius:10px;margin-top:1rem;display:none;font-size:.92rem}
.form-msg.ok{background:rgba(10,143,91,.08);color:#0a8f5b;display:block}
.form-msg.bad{background:rgba(192,57,43,.08);color:#c0392b;display:block}
.privacy-note{font-size:.76rem;color:var(--faint);margin-top:1rem}

/* ---------- 模态框 ---------- */
.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,.52);backdrop-filter:blur(6px);z-index:100;display:flex;align-items:flex-start;justify-content:center;padding:clamp(16px,3vw,40px);overflow-y:auto;opacity:0;visibility:hidden;transition:opacity .25s,visibility .25s}
.modal-overlay.open{opacity:1;visibility:visible}
.modal-card{background:#fff;border-radius:22px;width:100%;max-width:620px;margin:auto;padding:clamp(1.6rem,4vw,2.6rem);position:relative;box-shadow:var(--card-shadow-lg);max-height:calc(100vh - 48px);overflow-y:auto}
.modal-close{position:absolute;top:16px;right:16px;width:40px;height:40px;border-radius:50%;border:none;background:var(--bg-2);color:var(--ink);font-size:1.4rem;line-height:1;cursor:pointer;display:flex;align-items:center;justify-content:center}
.modal-close:hover{background:var(--bg-3)}
.modal-title{font-size:1.5rem;font-weight:800;letter-spacing:-.01em;margin-bottom:.4rem;padding-right:2.5rem}
.modal-sub{color:var(--muted);font-size:.95rem;margin-bottom:1.8rem}
body.modal-open{overflow:hidden}

/* ---------- 联系 ---------- */
.contact{text-align:center}
.contact .inner{max-width:720px;margin:0 auto}
.contact .mail-line{font-size:clamp(1.15rem,2.6vw,1.65rem);font-weight:700;color:var(--accent);word-break:break-all;display:inline-block;margin:1.2rem 0}
.contact-meta{margin-top:2.6rem;font-size:.86rem;color:var(--faint)}
.contact-meta span{display:inline-block;margin:0 .9rem}
.faq{max-width:760px;margin:0 auto;text-align:left}
.faq-item{border-bottom:1px solid var(--line);padding:1.3rem 0}
.faq-item h4{font-weight:700;font-size:1.02rem;margin-bottom:.35rem}
.faq-item p{color:var(--muted);font-size:.94rem}

/* ---------- Footer ---------- */
.footer{border-top:1px solid var(--line);padding:2.6rem 0;font-size:.85rem;color:var(--faint)}
.footer-inner{display:flex;justify-content:space-between;align-items:center;gap:1rem;flex-wrap:wrap}
.footer .brand-row{display:flex;align-items:center;gap:.6rem}
.footer .brand-row img{height:1.3rem;width:auto}
.footer .beian{display:flex;gap:1rem;flex-wrap:wrap;margin-top:.6rem}

/* ---------- 客服悬浮 ---------- */
.kf-float{position:fixed;right:22px;bottom:22px;z-index:90;display:flex;flex-direction:column;align-items:flex-end;gap:10px}
.kf-panel{display:none;background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:var(--card-shadow-lg);width:264px;padding:1.2rem;text-align:center}
.kf-panel.open{display:block}
.kf-panel h4{font-size:.95rem;margin-bottom:.3rem}
.kf-panel p{font-size:.8rem;color:var(--muted);margin-bottom:.8rem}
.kf-panel img{width:160px;height:160px;margin:0 auto .6rem;border:1px solid var(--line);border-radius:8px}
.kf-panel .btn{width:100%;margin-bottom:.5rem}
.kf-panel .mail{font-size:.82rem;color:var(--accent)}
.kf-fab{width:56px;height:56px;border-radius:50%;background:var(--accent);color:#fff;display:flex;align-items:center;justify-content:center;cursor:pointer;box-shadow:0 6px 20px rgba(0,113,227,.4);border:none;transition:transform .2s}
.kf-fab:hover{transform:scale(1.06)}
.kf-fab svg{width:26px;height:26px}

/* ---------- 手机 demo 界面（干净演示，无真实截图/店名/价格） ---------- */
.demo-app{position:absolute;inset:0;background:#f7f7f9;display:flex;flex-direction:column;overflow:hidden}
.demo-app .d-nav{height:46px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:center;font-size:15px;font-weight:600;color:var(--ink);letter-spacing:.01em;flex:none}
.demo-app .d-body{flex:1;padding:15px 13px;display:flex;flex-direction:column;gap:11px;overflow:hidden}
.demo-grad{background:linear-gradient(135deg,#0071E3 0%,#7c3aed 100%);border-radius:16px;padding:17px 15px;color:#fff;box-shadow:0 8px 20px rgba(124,58,237,.25)}
.demo-grad .t1{font-size:16px;font-weight:700;letter-spacing:-.01em}
.demo-grad .t2{font-size:11px;opacity:.85;margin-top:4px;line-height:1.5}
.demo-input{background:#fff;border:1px dashed #c7c7cc;border-radius:14px;padding:13px;color:#a8a8ad;font-size:12px;min-height:60px;line-height:1.6}
.demo-chips{display:flex;flex-wrap:wrap;gap:7px}
.demo-chip{font-size:11px;color:#4a4a52;background:#fff;border:1px solid var(--line);border-radius:999px;padding:4px 10px;white-space:nowrap}
.demo-btn{margin-top:auto;background:linear-gradient(135deg,#0071E3,#7c3aed);color:#fff;border-radius:999px;height:42px;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:600;box-shadow:0 6px 16px rgba(0,113,227,.28);flex:none}
.demo-song{background:linear-gradient(160deg,#1d1d1f,#2e2e3c);border-radius:16px;padding:15px;color:#fff;display:flex;flex-direction:column;gap:9px}
.demo-song .s-title{font-size:15px;font-weight:700}
.demo-song .s-lyric{font-size:11px;line-height:1.8;opacity:.82}
.demo-wave{display:flex;align-items:center;gap:3px;height:32px;padding:0 2px}
.demo-wave i{flex:1;background:linear-gradient(180deg,#7c3aed,#0071E3);border-radius:2px;min-width:3px}
.demo-actions{display:flex;gap:8px}
.demo-actions .a{flex:1;height:38px;border-radius:999px;display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:600}
.demo-actions .a.play{background:linear-gradient(135deg,#0071E3,#7c3aed);color:#fff;box-shadow:0 5px 14px rgba(0,113,227,.26)}
.demo-actions .a.share{background:#fff;color:var(--ink);border:1px solid var(--line)}

/* ---------- 动效 ---------- */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .8s cubic-bezier(.22,.61,.36,1),transform .8s cubic-bezier(.22,.61,.36,1)}
.reveal.visible{opacity:1;transform:translateY(0)}

/* ---------- Responsive ---------- */
@media(max-width:960px){
  .hero-grid{grid-template-columns:1fr;gap:3rem}
  .svc-grid,.feat-grid,.partner-grid{grid-template-columns:1fr}
  .points{grid-template-columns:1fr}
  .section-head{flex-direction:column;align-items:flex-start;gap:.8rem}
  .nav-links{display:none;position:absolute;top:100%;left:0;right:0;background:var(--bg);border-bottom:1px solid var(--line);flex-direction:column;align-items:stretch;padding:1.2rem 1.5rem;gap:0}
  .nav-links a{padding:.8rem 0;border-bottom:1px solid var(--line);font-size:1rem}
  .nav-links a:last-child{border-bottom:none}
  .nav-links .btn{margin-top:.8rem}
  .nav-links.open{display:flex}
  .nav-toggle{display:flex}
}
@media(max-width:640px){
  html{font-size:16px}
  .hero{padding-top:calc(5.5rem + 2vh)}
  .hero-proof{gap:1.6rem}
  .hero-cta{flex-direction:column}
  .hero-cta .btn{width:100%}
  .phones{flex-direction:column;align-items:center}
  .phone{width:min(230px,76vw)}
  .modal-overlay{padding:0}
  .modal-card{border-radius:0;max-height:100vh;height:100%;margin:0;padding:1.6rem 1.3rem}
  .contact-meta span{display:block;margin:.4rem 0}
  .kf-float{right:16px;bottom:16px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
}