/* QQ助手 官网 —— 与后台同一套视觉语言（无内联样式，配合严格 CSP） */
:root{
  --bg:#070a11; --txt:#e9eef8; --txt2:#9fabbf; --txt3:#6d7a90;
  --acc:#5b8cff; --acc2:#8b5cff; --acc3:#22d3ee;
  --line:rgba(255,255,255,.09); --line2:rgba(255,255,255,.16);
  --panel:rgba(255,255,255,.04); --panel2:rgba(255,255,255,.07);
  --r:16px; --mono:ui-monospace,SFMono-Regular,"Cascadia Mono",Consolas,monospace;
  --sh:0 24px 60px rgba(0,0,0,.5);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;color:var(--txt);background:var(--bg);
  font-family:system-ui,-apple-system,"Segoe UI","Microsoft YaHei",sans-serif;line-height:1.65;
  -webkit-font-smoothing:antialiased;
  background-image:
    radial-gradient(1200px 700px at 15% -8%,rgba(91,140,255,.2),transparent 62%),
    radial-gradient(1000px 620px at 92% 2%,rgba(139,92,255,.17),transparent 58%),
    radial-gradient(900px 700px at 50% 108%,rgba(34,211,238,.09),transparent 62%);
  background-attachment:fixed;
}
h1,h2,h3,p{margin:0}
a{color:inherit;text-decoration:none}
code{font-family:var(--mono);font-size:.92em}
.muted{color:var(--txt2)}
.small{font-size:13px}
dt{font-weight:600}
::selection{background:rgba(91,140,255,.35)}
::-webkit-scrollbar{width:10px}
::-webkit-scrollbar-thumb{background:rgba(255,255,255,.14);border-radius:8px;border:2px solid transparent;background-clip:content-box}

/* ---------------- 按钮 ---------------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 22px;border-radius:12px;
  border:1px solid var(--line2);background:var(--panel2);cursor:pointer;font-size:15px;font-weight:600;
  transition:transform .14s,background .18s,box-shadow .18s,border-color .18s;white-space:nowrap}
.btn:hover{background:rgba(255,255,255,.12);transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn-primary{border-color:transparent;color:#fff;background:linear-gradient(135deg,var(--acc),var(--acc2));
  box-shadow:0 12px 30px rgba(91,140,255,.34)}
.btn-primary:hover{background:linear-gradient(135deg,#6d99ff,#9b70ff);box-shadow:0 16px 40px rgba(91,140,255,.48)}
.btn-ghost{background:transparent}
.btn-sm{padding:9px 16px;font-size:14px;border-radius:10px}
.btn-lg{padding:14px 30px;font-size:16px}

/* ---------------- 顶部导航 ---------------- */
.nav{position:sticky;top:0;z-index:30;border-bottom:1px solid var(--line);
  background:rgba(7,10,17,.74);backdrop-filter:blur(18px)}
.nav-in{max-width:1120px;margin:0 auto;padding:13px 22px;display:flex;align-items:center;gap:22px}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;letter-spacing:.4px}
.logo-badge{width:34px;height:34px;border-radius:11px;display:grid;place-items:center;font-size:13px;font-weight:800;
  color:#fff;background:linear-gradient(135deg,var(--acc),var(--acc2));box-shadow:0 8px 20px rgba(91,140,255,.36)}
.nav-links{margin-left:auto;display:flex;gap:26px;font-size:14.5px;color:var(--txt2)}
.nav-links a{transition:color .16s}
.nav-links a:hover{color:#fff}

/* ---------------- 首屏 ---------------- */
.hero{position:relative;overflow:hidden;padding:70px 22px 40px}
.hero-glow{position:absolute;left:50%;top:-260px;width:1000px;height:640px;transform:translateX(-50%);
  background:radial-gradient(closest-side,rgba(91,140,255,.28),transparent 72%);pointer-events:none}
.hero-in{position:relative;max-width:1120px;margin:0 auto;text-align:center}
.pill{display:inline-flex;align-items:center;gap:8px;padding:7px 16px;border-radius:999px;font-size:13px;
  color:#cfe0ff;background:rgba(91,140,255,.13);border:1px solid rgba(91,140,255,.34)}
.hero h1{font-size:clamp(32px,6vw,62px);line-height:1.12;letter-spacing:-.5px;margin:22px 0 20px;font-weight:800}
.hero h1 em{font-style:normal;background:linear-gradient(120deg,#7ea6ff,#b98cff 45%,#4fd8ec);
  -webkit-background-clip:text;background-clip:text;color:transparent}
.hero-sub{max-width:660px;margin:0 auto;color:var(--txt2);font-size:clamp(15px,1.6vw,17.5px)}
.hero-cta{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin:34px 0 26px}
.notice{max-width:760px;margin:0 auto 26px;padding:13px 18px;border-radius:13px;font-size:14px;text-align:left;
  color:#ffe6bf;background:rgba(247,185,85,.1);border:1px solid rgba(247,185,85,.32)}

/* 界面示意 */
.mock{max-width:900px;margin:34px auto 0;border-radius:18px;overflow:hidden;border:1px solid var(--line2);
  background:linear-gradient(180deg,rgba(255,255,255,.07),rgba(255,255,255,.02));box-shadow:var(--sh);text-align:left}
.mock-bar{display:flex;align-items:center;gap:7px;padding:11px 15px;border-bottom:1px solid var(--line);
  background:rgba(0,0,0,.3)}
.mock-bar i{width:11px;height:11px;border-radius:50%;background:rgba(255,255,255,.18)}
.mock-bar i:first-child{background:#ff5f57}
.mock-bar i:nth-child(2){background:#febc2e}
.mock-bar i:nth-child(3){background:#28c840}
.mock-bar span{margin-left:12px;font-size:12.5px;color:var(--txt3)}
.mock-body{display:grid;grid-template-columns:190px 1fr;min-height:250px}
.mock-side{padding:16px 12px;border-right:1px solid var(--line);background:rgba(0,0,0,.16);display:grid;gap:5px;align-content:start}
.ms{padding:9px 12px;border-radius:9px;font-size:13.5px;color:var(--txt2)}
.ms.on{color:#fff;background:linear-gradient(90deg,rgba(91,140,255,.26),rgba(139,92,255,.08));border:1px solid rgba(91,140,255,.3)}
.mock-main{padding:18px;display:grid;gap:14px;align-content:start}
.mm-chat{display:grid;gap:12px}
.mm-row{display:flex;align-items:flex-end;gap:9px}
.mm-row.me{justify-content:flex-end}
.av{width:30px;height:30px;border-radius:10px;display:grid;place-items:center;font-size:12px;color:#fff;flex:none}
.av.a1{background:linear-gradient(135deg,#5b8cff,#22d3ee)}
.av.a2{background:linear-gradient(135deg,#8b5cff,#5b8cff)}
.av.a3{background:linear-gradient(135deg,#31d68f,#22d3ee)}
.bub{max-width:74%;padding:9px 14px;border-radius:14px;font-size:13.5px;color:var(--txt);
  background:rgba(255,255,255,.07);border:1px solid var(--line)}
.bub.me{background:linear-gradient(135deg,rgba(91,140,255,.85),rgba(139,92,255,.85));border-color:transparent;color:#fff}
.mm-quick{display:flex;gap:8px;align-items:center;flex-wrap:wrap;font-size:12.5px;color:var(--txt3)}
.mm-quick b{padding:5px 11px;border-radius:999px;background:var(--panel);border:1px solid var(--line);
  color:var(--txt2);font-weight:500}

/* ---------------- 区块 ---------------- */
.sec{max-width:1120px;margin:0 auto;padding:76px 22px}
.sec-h{font-size:clamp(24px,3.4vw,34px);letter-spacing:-.3px;font-weight:800}
.sec-p{color:var(--txt2);margin:12px 0 34px;font-size:16px}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(268px,1fr));gap:18px}
.feat{padding:24px;border-radius:var(--r);border:1px solid var(--line);background:var(--panel);
  transition:transform .2s,border-color .2s,background .2s}
.feat:hover{transform:translateY(-3px);border-color:rgba(91,140,255,.4);background:var(--panel2)}
.fi{display:grid;place-items:center;width:42px;height:42px;border-radius:13px;font-size:18px;margin-bottom:16px;
  color:#fff;background:linear-gradient(135deg,rgba(91,140,255,.9),rgba(139,92,255,.9));
  box-shadow:0 10px 24px rgba(91,140,255,.3)}
.feat h3{font-size:17px;margin-bottom:9px}
.feat p{color:var(--txt2);font-size:14.5px}

/* ---------------- 下载 ---------------- */
.dl-card{display:flex;align-items:center;justify-content:space-between;gap:26px;flex-wrap:wrap;
  padding:30px;border-radius:20px;border:1px solid var(--line2);
  background:linear-gradient(120deg,rgba(91,140,255,.14),rgba(139,92,255,.08) 55%,rgba(34,211,238,.07));box-shadow:var(--sh)}
.dl-left{display:flex;align-items:center;gap:20px}
.dl-ico{width:60px;height:60px;border-radius:18px;display:grid;place-items:center;font-size:26px;color:#fff;
  background:linear-gradient(135deg,var(--acc),var(--acc2));box-shadow:0 12px 30px rgba(91,140,255,.36);flex:none}
.dl-left h3{font-size:20px;margin-bottom:6px}
.dl-right{display:flex;flex-direction:column;align-items:flex-end;gap:9px}
.dl-tip{margin-top:18px}
#dlNotes{margin-top:8px;white-space:pre-wrap}

/* ---------------- 教程 ---------------- */
.steps{list-style:none;margin:0;padding:0;display:grid;gap:16px;counter-reset:s}
.steps>li{display:grid;grid-template-columns:56px 1fr;gap:18px;padding:22px;border-radius:var(--r);
  border:1px solid var(--line);background:var(--panel)}
.step-n{width:44px;height:44px;border-radius:14px;display:grid;place-items:center;font-weight:800;font-size:18px;
  color:#fff;background:linear-gradient(135deg,var(--acc),var(--acc2));box-shadow:0 10px 24px rgba(91,140,255,.32)}
.step-b h3{font-size:17px;margin-bottom:8px}
.step-b p{color:var(--txt2);font-size:14.5px}
.step-b strong{color:#fff}
.step-b code{padding:2px 7px;border-radius:6px;background:rgba(0,0,0,.36);border:1px solid var(--line);color:#cfe0ff}
.cmd{display:flex;align-items:center;gap:10px;margin-top:13px;padding:11px 13px;border-radius:11px;
  background:rgba(0,0,0,.42);border:1px solid var(--line);overflow:hidden}
.cmd code{flex:1;min-width:0;overflow-x:auto;white-space:nowrap;color:#cfe0ff;font-size:13px}
.cbtn{padding:6px 13px;border-radius:9px;border:1px solid var(--line2);background:var(--panel2);color:var(--txt);
  cursor:pointer;font-size:12.5px;white-space:nowrap;transition:background .16s}
.cbtn:hover{background:rgba(255,255,255,.14)}

/* ---------------- FAQ ---------------- */
.faq{display:grid;gap:11px}
.faq details{border-radius:13px;border:1px solid var(--line);background:var(--panel);overflow:hidden}
.faq summary{padding:16px 20px;cursor:pointer;font-weight:600;font-size:15.5px;list-style:none;
  display:flex;align-items:center;justify-content:space-between;gap:14px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:20px;color:var(--txt3);flex:none;transition:transform .2s}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq details[open] summary{border-bottom:1px solid var(--line)}
.faq p{padding:16px 20px;color:var(--txt2);font-size:14.5px}

/* ---------------- 页脚 ---------------- */
.foot{border-top:1px solid var(--line);margin-top:40px;background:rgba(0,0,0,.24)}
.foot-in{max-width:1120px;margin:0 auto;padding:34px 22px;display:flex;justify-content:space-between;
  align-items:center;gap:22px;flex-wrap:wrap}
.foot-r{display:flex;gap:18px;flex-wrap:wrap}

/* ---------------- 响应式 ---------------- */
@media(max-width:880px){
  .mock-body{grid-template-columns:1fr}
  .mock-side{display:none}
  .nav-links{display:none}
  .nav-in{justify-content:space-between}
  .dl-card{flex-direction:column;align-items:flex-start}
  .dl-right{align-items:stretch;width:100%}
  .dl-right .btn{width:100%}
  .steps>li{grid-template-columns:1fr;gap:12px}
  .sec{padding:56px 18px}
}
@media(prefers-reduced-motion:reduce){*{animation:none !important;transition:none !important}html{scroll-behavior:auto}}