/* QiaoRui website: one design system for every page */
:root{
  --navy:#1D1D1F;--navy2:#000000;--navy3:#3A3A3C;--orange:#FF9500;--orange2:#F08A00;--orange-ink:#C26A00;
  --accent:#007AFF;--accent2:#0062CC;--accent-t:#E5F1FF;
  --cream:#F2F2F7;--paper:#FFFFFF;--ink:#1D1D1F;--mute:#6E6E73;--line:#E5E5EA;--soft:#EDEDF0;
  --teal:#34C759;--teal-t:#E4F8E9;--red:#FF3B30;--blue:#007AFF;--indigo:#5E5CE6;--purple:#AF52DE;--pink:#FF2D55;
  --r:18px;--sh:0 1px 2px rgba(0,0,0,.04),0 8px 24px rgba(0,0,0,.06);--sh2:0 20px 50px rgba(0,0,0,.14);
  --side:252px;--top:60px;
  --f:-apple-system,BlinkMacSystemFont,"SF Pro Text","Inter","PingFang SC","QR SC","Microsoft YaHei",sans-serif;
}
@font-face{font-family:"Inter";src:url(/fonts/inter.woff2) format("woff2");font-weight:100 900;font-display:swap}
@font-face{font-family:"QR SC";src:url(/fonts/sc.woff2) format("woff2");font-weight:100 900;font-display:swap}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:var(--f);background:var(--cream);color:var(--ink);line-height:1.6;font-size:15.5px;-webkit-font-smoothing:antialiased;font-feature-settings:"cv11","ss01"}
a{color:inherit}
img{max-width:100%}
button{font:inherit;color:inherit;cursor:pointer;border:0;background:none}
input,textarea,select{font:inherit;color:inherit}
:focus-visible{outline:3px solid var(--accent);outline-offset:2px;border-radius:6px}
[lang=zh]{display:none}
html[data-lang=zh] [lang=en]{display:none}
html[data-lang=zh] [lang=zh]{display:revert}
html[data-lang=zh] body{letter-spacing:.01em}
h1,h2,h3{letter-spacing:-.022em;line-height:1.15}
html[data-lang=zh] h1,html[data-lang=zh] h2,html[data-lang=zh] h3{letter-spacing:0}

/* ---------- shell: top bar, side bar, mobile tabs ---------- */
.top{position:fixed;inset:0 0 auto 0;height:var(--top);z-index:50;display:flex;align-items:center;gap:14px;padding:0 18px;background:rgba(255,255,255,.72);backdrop-filter:saturate(1.4) blur(14px);-webkit-backdrop-filter:saturate(1.4) blur(14px);border-bottom:1px solid var(--line)}
.logo{display:flex;align-items:center;gap:10px;text-decoration:none}
.logo img{height:38px;width:auto}
.top .grow{flex:1}
.langsw{display:inline-flex;padding:4px;border-radius:999px;background:var(--paper);border:1px solid var(--line);box-shadow:var(--sh)}
.langsw button{min-width:52px;height:34px;border-radius:999px;font-weight:800;font-size:13.5px;color:var(--mute);transition:.2s}
.langsw button.on{background:var(--accent);color:#fff}
.me-btn{display:inline-flex;align-items:center;gap:8px;height:42px;padding:0 14px 0 6px;border-radius:999px;background:var(--accent);color:#fff;font-weight:700;font-size:14px}
.me-btn .av{width:32px;height:32px;font-size:18px}
.me-btn.out{padding:0 18px;background:var(--accent);white-space:nowrap}
.burger{display:none;width:42px;height:42px;border-radius:12px;align-items:center;justify-content:center}
.side{position:fixed;top:var(--top);bottom:0;left:0;width:var(--side);padding:14px 12px 24px;overflow:auto;border-right:.5px solid #D1D1D6;background:rgba(246,246,248,.86);backdrop-filter:saturate(1.6) blur(20px);-webkit-backdrop-filter:saturate(1.6) blur(20px);z-index:40}
.side .grp{font-size:11.5px;font-weight:800;letter-spacing:.12em;text-transform:uppercase;color:#9AA3B1;margin:18px 12px 6px}
.side a{display:flex;align-items:center;gap:12px;padding:6px 10px;border-radius:10px;text-decoration:none;font-weight:500;font-size:15px;color:var(--ink);transition:background .15s,color .15s;margin:1px 0}
.side a .tile{width:30px;height:30px;border-radius:8px;display:grid;place-items:center;flex:none;background:var(--c,#8E8E93);box-shadow:inset 0 -1px 0 rgba(0,0,0,.08)}
.side a svg{width:18px;height:18px;flex:none;stroke:#fff;fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.side a:hover{background:rgba(0,0,0,.05)}
.side a.on{background:var(--accent);color:#fff;box-shadow:0 4px 12px rgba(0,122,255,.25)}
.side a.on .tile{background:rgba(255,255,255,.22)!important;box-shadow:none}
.side a .soon{margin-left:auto;font-size:10.5px;font-weight:800;color:var(--orange-ink);background:rgba(240,138,36,.14);padding:2px 7px;border-radius:999px}
.side .card-mini{margin:20px 4px 0;padding:14px;border-radius:16px;background:linear-gradient(135deg,#0A84FF,#5E5CE6);color:#fff;font-size:13px;box-shadow:0 10px 24px rgba(10,132,255,.25)}
.side .card-mini b{display:block;font-size:14.5px;margin-bottom:4px}
.side .card-mini a{display:inline-flex;margin-top:10px;padding:7px 14px;background:#fff;color:var(--accent);border-radius:999px;font-size:13px;font-weight:700}
main.page{margin-left:var(--side);padding-top:var(--top);min-height:100vh}
.wrap{max-width:1120px;margin:0 auto;padding:0 28px}
.tabs{display:none}
@media (max-width:1000px){
  .side{transform:translateX(-102%);transition:transform .25s ease;box-shadow:var(--sh2);background:var(--paper)}
  body.nav-open .side{transform:none}
  main.page{margin-left:0;padding-bottom:76px}
  .burger{display:inline-flex}
  .tabs{display:flex;position:fixed;left:0;right:0;bottom:0;z-index:45;height:66px;background:rgba(255,255,255,.95);backdrop-filter:blur(12px);border-top:1px solid var(--line);padding-bottom:env(safe-area-inset-bottom)}
  .tabs a{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;text-decoration:none;font-size:11px;font-weight:700;color:#64748B}
  .tabs a svg{width:22px;height:22px;stroke:currentColor;fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
  .tabs a.on{color:var(--accent)}
  .tabs a.on svg{stroke:var(--accent)}
  .wrap{padding:0 18px}
  .logo img{height:32px}
  .me-btn .nm{display:none}
  .me-btn.out{padding:0 14px;font-size:13px}.top{gap:8px;padding:0 10px}.sndbtn{width:34px;height:34px}.langsw button{min-width:44px}
}
.scrim{display:none}
body.nav-open .scrim{display:block;position:fixed;inset:0;background:rgba(14,29,56,.35);z-index:39}

/* ---------- building blocks ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;min-height:48px;padding:0 22px;border-radius:14px;font-weight:750;font-size:15px;text-decoration:none;border:1.5px solid transparent;transition:transform .15s,box-shadow .15s,background .15s;white-space:nowrap}
.btn svg{width:19px;height:19px;stroke:currentColor;fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.btn:hover{transform:translateY(-1px)}
.btn.pri{background:var(--accent);color:#fff;box-shadow:0 8px 20px rgba(0,122,255,.28)}
.btn.pri:hover{background:var(--accent2)}
.btn.navy{background:var(--navy);color:#fff}
.btn.ghost{background:var(--paper);border-color:var(--line)}
.btn.ghost:hover{border-color:var(--navy)}
.btn.glass{background:rgba(255,255,255,.12);color:#fff;border-color:rgba(255,255,255,.3)}
.btn.sm{min-height:38px;padding:0 14px;font-size:13.5px;border-radius:11px}
.btn[disabled]{opacity:.5;pointer-events:none}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:12.5px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--accent)}
.eyebrow:before{content:"";width:18px;height:2px;background:var(--accent);border-radius:2px}
.h2{font-size:clamp(26px,3.4vw,38px);font-weight:850;margin-top:10px}
.lead{color:var(--mute);font-size:17px;margin-top:10px;max-width:680px}
.sec{padding:64px 0}
.card{background:var(--paper);border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--sh)}
.pill{display:inline-flex;align-items:center;gap:6px;font-size:12px;font-weight:700;padding:4px 10px;border-radius:999px;background:var(--accent-t);color:var(--accent)}
.pill.teal{background:var(--teal-t);color:var(--teal)}
.pill.navy{background:rgba(20,40,75,.08);color:var(--navy)}
.grid{display:grid;gap:18px}
.g2{grid-template-columns:repeat(2,minmax(0,1fr))}.g3{grid-template-columns:repeat(3,minmax(0,1fr))}.g4{grid-template-columns:repeat(4,minmax(0,1fr))}
@media (max-width:900px){.g3,.g4{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:620px){.g2,.g3,.g4{grid-template-columns:1fr}}
.reveal{opacity:0;transform:translateY(18px);transition:opacity .6s ease,transform .6s ease}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}*{animation:none!important;transition:none!important}}
.av{display:inline-grid;place-items:center;width:40px;height:40px;border-radius:50%;background:var(--soft);font-size:22px;overflow:hidden;flex:none}
.av img{width:100%;height:100%;object-fit:cover}
.badge{display:inline-grid;place-items:center;width:17px;height:17px;border-radius:50%;background:var(--blue);color:#fff;font-size:10px;font-weight:900;vertical-align:middle}
.toast{position:fixed;left:50%;bottom:90px;transform:translateX(-50%) translateY(20px);opacity:0;z-index:99;background:var(--navy);color:#fff;padding:12px 18px;border-radius:12px;font-weight:650;box-shadow:var(--sh2);transition:.25s;pointer-events:none;max-width:90vw}
.toast.on{opacity:1;transform:translateX(-50%)}

/* ---------- sign-in dialog ---------- */
.modal{position:fixed;inset:0;z-index:80;display:grid;place-items:center;background:rgba(14,29,56,.45);padding:16px;animation:fade .2s}
@keyframes fade{from{opacity:0}}
.modal .box{width:min(460px,100%);max-height:92vh;overflow:auto;background:var(--paper);border-radius:22px;box-shadow:var(--sh2);padding:26px;animation:pop .25s cubic-bezier(.2,.9,.3,1.2)}
@keyframes pop{from{transform:scale(.94);opacity:0}}
.modal h3{font-size:22px;font-weight:850}
.modal .x{float:right;width:36px;height:36px;border-radius:50%;font-size:20px;color:var(--mute)}
.field{display:block;margin-top:12px}
.field span{display:block;font-size:13px;font-weight:700;color:var(--mute);margin-bottom:5px}
.field input,.field select,.field textarea{width:100%;min-height:46px;border-radius:12px;border:1.5px solid var(--line);background:var(--cream);padding:10px 14px;font-size:15px}
.field input:focus,.field textarea:focus{border-color:var(--navy);outline:none;background:#fff}
.emojis{display:flex;flex-wrap:wrap;gap:6px;margin-top:6px}
.emojis button{width:40px;height:40px;border-radius:12px;font-size:21px;background:var(--cream);border:1.5px solid var(--line)}
.emojis button.on{border-color:var(--orange);background:rgba(240,138,36,.12)}
.swap{margin-top:14px;font-size:14px;color:var(--mute);text-align:center}
.swap button{color:var(--orange-ink);font-weight:800}
.err{color:var(--red);font-weight:650;font-size:14px;margin-top:10px;min-height:20px}
.foot{margin-top:40px;padding:34px 0 30px;border-top:1px solid var(--line);color:var(--mute);font-size:13.5px}
.foot .row{display:flex;gap:24px;flex-wrap:wrap;justify-content:space-between}
.foot a{color:var(--navy);font-weight:650}
/* ---------- iOS look for member areas (chat, progress) ---------- */
body.ios{--cream:#F2F2F7;--paper:#FFFFFF;--line:#E5E5EA;--soft:#E9E9EB;--ink:#1C1C1E;--mute:#8E8E93;--orange:#FF9500;--orange2:#F08A00;--orange-ink:#C77700;--teal:#34C759;--teal-t:#E4F8E9;--blue:#007AFF;--red:#FF3B30;--navy:#1C1C1E;--navy3:#3A3A3C;
  --f:-apple-system,BlinkMacSystemFont,"SF Pro Text","Inter","PingFang SC","QR SC","Microsoft YaHei",sans-serif;--r:16px;--sh:0 1px 2px rgba(0,0,0,.04),0 6px 18px rgba(0,0,0,.05)}
body.ios .top{background:rgba(242,242,247,.82)}
body.ios .side{background:#F2F2F7}
body.ios .side a.on{background:var(--blue);box-shadow:0 6px 16px rgba(0,122,255,.25)}
body.ios .btn.pri{background:var(--blue);box-shadow:0 8px 20px rgba(0,122,255,.25)}
body.ios .btn.pri:hover{background:#0067D6}
body.ios .langsw button.on{background:var(--blue)}
body.ios .me-btn{background:var(--blue)}
/* top bar sound button */
.sndbtn{width:38px;height:38px;border-radius:50%;background:var(--paper);border:.5px solid var(--line);font-size:16px;box-shadow:var(--sh)}
/* iMessage-style join */
.modal.imsg .box{padding:0;overflow:hidden;display:flex;flex-direction:column;height:min(640px,92vh);width:min(420px,100%);border-radius:28px;background:#fff}
.ih{display:flex;align-items:flex-start;padding:12px 14px 10px;background:rgba(246,246,248,.95);border-bottom:.5px solid #D1D1D6}
.ih .x{float:none;width:34px;height:34px;font-size:16px}.ih .sw{font-size:14px;font-weight:600;color:var(--accent);padding:8px 4px}
.ihc{flex:1;display:flex;flex-direction:column;align-items:center;gap:2px}
.ihc img{width:50px;height:50px;border-radius:50%}.ihc b{font-size:13px;font-weight:600}.ihc span{font-size:11px;color:#8E8E93}
.ithread{flex:1;overflow-y:auto;padding:14px 12px;display:flex;flex-direction:column;gap:6px;background:#fff}
.ib2{max-width:78%;padding:8px 13px;border-radius:19px;font-size:15.5px;line-height:1.38;animation:msgin2 .28s cubic-bezier(.2,.9,.3,1.2)}
@keyframes msgin2{from{opacity:0;transform:translateY(8px) scale(.95)}}
.ib2.them{align-self:flex-start;background:#E9E9EB;color:#000;border-bottom-left-radius:5px}
.ib2.me{align-self:flex-end;background:linear-gradient(180deg,#36A3FF,#007AFF);color:#fff;border-bottom-right-radius:5px}
.dots3{display:inline-flex;gap:4px;padding:4px 2px}.dots3 i{width:7px;height:7px;border-radius:50%;background:#8E8E93;animation:bl 1s infinite}.dots3 i:nth-child(2){animation-delay:.15s}.dots3 i:nth-child(3){animation-delay:.3s}
@keyframes bl{50%{opacity:.3;transform:translateY(-2px)}}
.ipick{align-self:flex-start;display:grid;grid-template-columns:repeat(5,1fr);gap:6px;background:#F2F2F7;padding:10px;border-radius:18px;max-width:86%;animation:msgin2 .3s}
.ipick button{font-size:26px;width:46px;height:46px;border-radius:14px;background:#fff;transition:transform .15s}.ipick button:hover{transform:scale(1.15)}
.ibar{display:flex;gap:8px;padding:8px 10px;border-top:.5px solid #D1D1D6;background:rgba(246,246,248,.95)}
.ibar input{flex:1;height:38px;border-radius:20px;border:1px solid #C7C7CC;padding:0 14px;font-size:16px;background:#fff}
.ibar input:focus{outline:none;border-color:var(--accent)}
.ibar button{width:34px;height:34px;align-self:center;border-radius:50%;background:var(--accent);color:#fff;font-weight:900;font-size:17px}
.inote{font-size:11px;color:#8E8E93;text-align:center;padding:0 12px 10px;background:rgba(246,246,248,.95)}
/* study music */
.mfab{position:fixed;right:18px;bottom:22px;z-index:55;width:54px;height:54px;border-radius:50%;font-size:24px;background:linear-gradient(135deg,#FF2D55,#AF52DE);color:#fff;box-shadow:0 12px 30px rgba(175,82,222,.4);transition:transform .2s}
.mfab:hover{transform:scale(1.08) rotate(-8deg)}
.mdrawer{position:fixed;right:18px;bottom:88px;z-index:56;width:min(360px,calc(100vw - 24px));max-height:min(620px,calc(100vh - 120px));overflow:auto;background:rgba(255,255,255,.92);backdrop-filter:blur(24px);-webkit-backdrop-filter:blur(24px);border-radius:24px;box-shadow:0 24px 60px rgba(0,0,0,.22);padding:14px;transform:translateY(20px) scale(.96);opacity:0;pointer-events:none;transition:.25s}
.mdrawer.on{transform:none;opacity:1;pointer-events:auto}
.mdrawer.inline{position:static;transform:none;opacity:1;pointer-events:auto;width:100%;max-height:none;box-shadow:none;background:transparent}
.mh{display:flex;align-items:center;gap:8px}.mh .grow{flex:1}.mh button{font-size:13px;font-weight:600;color:var(--accent);padding:4px 6px}
.mnow{display:flex;gap:12px;align-items:center;margin-top:10px}
.disc{width:58px;height:58px;border-radius:14px;display:grid;place-items:center;font-size:34px;background:linear-gradient(135deg,#FFD60A,#FF9500)}
.disc.spin{animation:rot 4s linear infinite}@keyframes rot{to{transform:rotate(360deg)}}
.mnow b{display:block;font-size:15px}.mnow span{font-size:12.5px;color:#8E8E93}
#mseek,#mvol{width:100%;accent-color:var(--accent);margin-top:10px}
.mctl{display:flex;align-items:center;gap:10px;margin-top:4px}.mctl button{font-size:20px;width:40px;height:40px;border-radius:50%}.mctl .big{background:var(--accent);color:#fff;width:46px;height:46px}
.mctl #mvol{flex:1;margin:0}
.moods{display:flex;gap:6px;flex-wrap:wrap;margin-top:10px}.moods button{font-size:12.5px;font-weight:600;padding:5px 11px;border-radius:999px;background:#E9E9EB}.moods button.on{background:var(--accent);color:#fff}
.msearch{width:100%;height:36px;margin-top:10px;border-radius:12px;border:0;background:#E9E9EB;padding:0 12px;font-size:14px}
.mlist{margin-top:8px;display:grid;gap:2px}
.mt{display:grid;grid-template-columns:24px 1fr;gap:0 8px;text-align:left;padding:8px 10px;border-radius:12px}
.mt:hover{background:rgba(0,0,0,.05)}.mt.on{background:var(--accent-t)}.mt span{grid-row:span 2;align-self:center}.mt b{font-size:14px;font-weight:600}.mt small{font-size:11.5px;color:#8E8E93}
.mcred{font-size:11px;color:#8E8E93;margin-top:10px}
@media (max-width:1000px){.mfab{bottom:82px;right:14px;width:48px;height:48px;font-size:21px}.mdrawer{bottom:140px;right:12px}}
body.qb .mfab{bottom:auto;top:70px;right:16px;width:42px;height:42px;font-size:18px}
body.qb .mdrawer{bottom:auto;top:118px}