/* Shared styles for the beTenis Guides section (hub + articles). */
:root{
  --ground:#0a0c0f; --panel:#13161a; --panel2:#171b1f;
  --line:rgba(255,255,255,.08); --frame:rgba(33,229,141,.22);
  --text:#f3f5f3; --muted:#9aa6a0; --subtle:#6c7772;
  --green:#21e58d; --green-dim:#16b86f; --optic:#d9f24f; --ink:#04120c;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--ground);color:var(--text);font-family:'Archivo',system-ui,-apple-system,'Segoe UI',sans-serif;line-height:1.65;-webkit-font-smoothing:antialiased;overflow-x:hidden}
body::before{content:'';position:fixed;inset:0;z-index:-1;pointer-events:none;
  background:radial-gradient(70vw 55vh at 82% -12%,rgba(33,229,141,.1),transparent 60%),radial-gradient(50vw 45vh at 5% 4%,rgba(217,242,79,.05),transparent 55%)}
a{color:var(--green);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:1140px;margin:0 auto;padding:0 22px}
.narrow{max-width:740px;margin:0 auto;padding:0 22px}

/* nav */
nav{position:sticky;top:0;z-index:50;backdrop-filter:blur(14px);background:rgba(10,12,15,.66);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;gap:14px;height:64px}
.brand{display:flex;align-items:center;gap:10px;font-weight:900;font-size:20px;letter-spacing:-.02em;color:var(--text)}
.brand:hover{text-decoration:none}
.brand .be{color:var(--muted);font-weight:800}
.brand svg{width:30px;height:30px;flex:none}
.nav .links{margin-left:auto;display:flex;gap:24px;align-items:center}
.nav .links a:not(.btn){color:var(--muted);font-weight:700;font-size:15px}
.nav .links a:not(.btn):hover{color:var(--text);text-decoration:none}
.btn{display:inline-flex;align-items:center;gap:8px;background:var(--green);color:var(--ink);font-weight:900;font-size:15px;padding:11px 18px;border-radius:11px;box-shadow:0 6px 22px rgba(33,229,141,.28);transition:transform .15s,box-shadow .2s}
.btn:hover{transform:translateY(-2px);box-shadow:0 10px 30px rgba(33,229,141,.4);text-decoration:none}
@media(max-width:640px){.nav .links a:not(.btn){display:none}}

/* breadcrumb */
.crumbs{padding:22px 0 0;font-size:13.5px;font-weight:700;color:var(--subtle)}
.crumbs a{color:var(--muted)}
.crumbs span{margin:0 8px;color:var(--subtle)}

/* article header */
.ah{padding:26px 0 10px}
.eyebrow{display:inline-block;font-family:ui-monospace,monospace;font-size:12.5px;letter-spacing:.15em;text-transform:uppercase;color:var(--green);font-weight:700}
h1{font-size:clamp(32px,5.2vw,50px);font-weight:900;line-height:1.05;letter-spacing:-.035em;margin:14px 0 0}
.meta{color:var(--muted);font-size:14px;font-weight:700;margin-top:16px;display:flex;gap:16px;flex-wrap:wrap;align-items:center}
.meta .dot{width:4px;height:4px;border-radius:50%;background:var(--subtle)}
.lede{color:var(--muted);font-size:19px;font-weight:600;line-height:1.55;margin-top:20px}

/* prose */
article{padding:8px 0 40px}
article h2{font-size:clamp(23px,3.4vw,30px);font-weight:900;letter-spacing:-.025em;margin:40px 0 0;padding-top:8px}
article h3{font-size:19px;font-weight:900;letter-spacing:-.015em;margin:28px 0 0;color:var(--text)}
article p{color:#d7ddd9;font-size:17px;margin-top:14px}
article ul,article ol{margin:14px 0 0;padding-left:22px;color:#d7ddd9;font-size:17px}
article li{margin-top:9px}
article li::marker{color:var(--green)}
article strong{color:#fff;font-weight:800}
article a{font-weight:700}
.callout{background:var(--panel);border:1px solid var(--frame);border-left:3px solid var(--green);border-radius:12px;padding:18px 20px;margin-top:24px}
.callout .t{font-size:13px;font-weight:900;text-transform:uppercase;letter-spacing:.08em;color:var(--green)}
.callout p{margin-top:6px;font-size:15.5px;color:#e6ebe7}
.factorcard{background:linear-gradient(180deg,var(--panel),var(--panel2));border:1px solid var(--line);border-radius:14px;padding:20px 22px;margin-top:16px}
.factorcard h3{margin-top:0;display:flex;align-items:center;gap:10px}
.factorcard h3 .b{width:30px;height:30px;border-radius:9px;display:grid;place-items:center;background:rgba(33,229,141,.12);border:1px solid var(--frame);font-family:ui-monospace,monospace;font-weight:800;font-size:13px;color:var(--green);flex:none}
.factorcard p{margin-top:8px;font-size:15.5px}
.disclaimer{border-top:1px solid var(--line);margin-top:40px;padding-top:20px;color:var(--subtle);font-size:14px;line-height:1.6}

/* cta box */
.ctabox{background:linear-gradient(120deg,rgba(33,229,141,.13),rgba(217,242,79,.05));border:1px solid var(--frame);border-radius:18px;padding:30px;margin-top:44px;text-align:center}
.ctabox h3{font-size:24px;font-weight:900;letter-spacing:-.02em;margin:0}
.ctabox p{color:var(--muted);font-size:16px;font-weight:600;margin-top:8px}
.ctabox .btn{margin-top:18px}

/* related */
.related{margin-top:48px}
.related .t{font-size:13px;font-weight:900;text-transform:uppercase;letter-spacing:.08em;color:var(--subtle)}
.related .row{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:14px}
@media(max-width:640px){.related .row{grid-template-columns:1fr}}
.related a{display:block;background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:16px 18px;color:var(--text);transition:border-color .2s,transform .2s}
.related a:hover{border-color:var(--frame);transform:translateY(-3px);text-decoration:none}
.related a b{display:block;font-size:15.5px;font-weight:900}
.related a span{color:var(--muted);font-size:13.5px;font-weight:600;margin-top:3px;display:block}

/* hub */
.hubhero{padding:40px 0 6px}
.hubhero h1{font-size:clamp(34px,5.6vw,54px)}
.guidegrid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin:34px 0 20px}
@media(max-width:720px){.guidegrid{grid-template-columns:1fr}}
.gcard{display:block;background:linear-gradient(180deg,var(--panel),var(--panel2));border:1px solid var(--line);border-radius:18px;padding:24px;color:var(--text);transition:border-color .25s,transform .25s,box-shadow .25s}
.gcard:hover{border-color:var(--frame);transform:translateY(-5px);box-shadow:0 20px 44px rgba(0,0,0,.4);text-decoration:none}
.gcard .tag{display:inline-block;font-family:ui-monospace,monospace;font-size:11.5px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--green);border:1px solid var(--frame);border-radius:999px;padding:4px 11px;background:rgba(33,229,141,.05)}
.gcard h2{font-size:22px;font-weight:900;letter-spacing:-.02em;margin:14px 0 0;padding:0}
.gcard p{color:var(--muted);font-size:15px;font-weight:600;margin-top:9px}
.gcard .rt{color:var(--subtle);font-size:13px;font-weight:800;margin-top:14px}

/* footer */
footer{border-top:1px solid var(--line);margin-top:64px;padding:36px 0}
.foot{display:flex;flex-wrap:wrap;gap:18px;align-items:center;justify-content:space-between}
.foot .links{display:flex;gap:20px;flex-wrap:wrap}
.foot a{color:var(--muted);font-weight:700;font-size:14px}
.foot .fine{color:var(--subtle);font-size:12.5px;max-width:60ch;margin-top:16px;line-height:1.6}

.reveal{opacity:0;transform:translateY(20px);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}html{scroll-behavior:auto}}

/* mobile bottom tab bar — app-style (matches the home page) */
.tabbar{display:none}
@media(max-width:640px){
  .tabbar{display:flex;position:fixed;left:0;right:0;bottom:0;z-index:60;
    background:rgba(10,12,15,.92);backdrop-filter:blur(16px);border-top:1px solid var(--line);
    padding:7px 6px calc(7px + env(safe-area-inset-bottom))}
  .tab{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;
    color:var(--subtle);font-size:10.5px;font-weight:800;min-height:46px;padding:3px;transition:color .2s,transform .15s}
  .tab:hover{text-decoration:none}
  .tab:active{transform:scale(.92)}
  .tab svg{width:23px;height:23px;stroke:currentColor;fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
  .tab.active,.tab.get{color:var(--green)}
  body{padding-bottom:70px}
}