*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
:root{--bg:#000;--card:rgba(255,255,255,.04);--card-h:rgba(255,255,255,.07);--brd:rgba(255,255,255,.08);--t1:#f5f5f7;--t2:rgba(245,245,247,.6);--t3:rgba(245,245,247,.4);--g1:#6366f1;--g2:#a855f7;--radius:16px;--font:'Inter',system-ui,sans-serif}
html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased}
body{font-family:var(--font);background:var(--bg);color:var(--t1);line-height:1.7;min-height:100vh}
a{color:var(--g1);text-decoration:none}
a:hover{text-decoration:underline}
.nav{position:sticky;top:0;z-index:100;background:rgba(0,0,0,.8);backdrop-filter:blur(20px);border-bottom:1px solid var(--brd);padding:16px 32px}
.nav-inner{max-width:1200px;margin:0 auto;display:flex;align-items:center;justify-content:space-between}
.nav-logo{display:flex;align-items:center;gap:8px;font-weight:700;font-size:16px;color:var(--t1)}
.nav-logo img{height:24px}
.accent{color:var(--g2)}
.nav-links{display:flex;gap:24px;align-items:center;font-size:14px;color:var(--t2)}
.nav-links a{color:var(--t2)}
.nav-links a:hover{color:var(--t1);text-decoration:none}
article{max-width:760px;margin:0 auto;padding:40px 24px 80px}
.breadcrumb{font-size:13px;color:var(--t3);margin-bottom:32px}
.breadcrumb a{color:var(--g1)}
.meta{display:flex;gap:12px;margin-bottom:32px;flex-wrap:wrap}
.meta span{padding:4px 12px;border-radius:100px;font-size:12px;font-weight:600}
.meta .diff-easy{background:rgba(16,185,129,.12);color:#10b981}
.meta .diff-mid{background:rgba(245,158,11,.12);color:#f59e0b}
.meta .diff-hard{background:rgba(244,63,94,.12);color:#f43f5e}
.meta .lang{background:rgba(99,102,241,.12);color:var(--g1)}
h1{font-size:40px;font-weight:900;letter-spacing:-.04em;line-height:1.15;margin-bottom:12px}
h1 .gradient{background:linear-gradient(135deg,var(--g1),var(--g2));-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.lead{font-size:18px;color:var(--t2);margin-bottom:40px;max-width:600px}
h2{font-size:24px;font-weight:800;letter-spacing:-.02em;margin:48px 0 16px;padding-top:16px;border-top:1px solid var(--brd)}
h3{font-size:18px;font-weight:700;margin:32px 0 12px}
p{color:var(--t2);margin-bottom:16px}
strong{color:var(--t1);font-weight:600}
ul,ol{color:var(--t2);margin:0 0 16px 24px}
li{margin-bottom:6px}
code{font-family:'SF Mono','Fira Code',monospace;font-size:.9em;background:rgba(255,255,255,.06);padding:2px 6px;border-radius:4px;color:#c4b5fd}
pre{background:rgba(255,255,255,.03);border:1px solid var(--brd);border-radius:12px;padding:20px;overflow-x:auto;margin:16px 0 24px;font-size:13px;line-height:1.6}
pre code{background:none;padding:0;color:var(--t1)}
.comment{color:var(--t3)}
.keyword{color:#c084fc}
.string{color:#86efac}
.func{color:#93c5fd}
.num{color:#fbbf24}
table{width:100%;border-collapse:collapse;margin:16px 0 24px;font-size:14px}
th{text-align:left;padding:10px 12px;background:rgba(255,255,255,.04);color:var(--t1);font-weight:600;border-bottom:1px solid var(--brd)}
td{padding:10px 12px;border-bottom:1px solid rgba(255,255,255,.04);color:var(--t2)}
.callout{background:linear-gradient(135deg,rgba(99,102,241,.08),rgba(168,85,247,.08));border:1px solid rgba(99,102,241,.2);border-radius:12px;padding:20px;margin:24px 0}
.callout p{color:var(--t2);margin:0}
.nav-prev-next{display:flex;justify-content:space-between;margin-top:64px;padding-top:24px;border-top:1px solid var(--brd)}
.nav-prev-next a{display:flex;flex-direction:column;gap:2px;padding:12px 16px;border-radius:12px;transition:.2s;color:var(--t1)}
.nav-prev-next a:hover{background:var(--card);text-decoration:none}
.nav-prev-next .label{font-size:12px;color:var(--t3);font-weight:500}
.nav-prev-next .title{font-size:15px;font-weight:600}
.nav-prev-next .next{text-align:right}
@media(max-width:600px){h1{font-size:28px}h2{font-size:20px}article{padding:24px 16px 60px}pre{font-size:12px;padding:12px}}