/* ============================================================
   AthletePro Blog · Apple-style light theme
   ============================================================ */
:root{
  --bg:#ffffff;
  --bg-alt:#f5f5f7;
  --bg-tint:#fbfbfd;
  --border:rgba(0,0,0,0.08);
  --border-strong:rgba(0,0,0,0.14);
  --text:#1d1d1f;
  --text-dim:#424245;
  --text-mute:#6e6e73;
  --text-soft:#86868b;
  --accent:#0071e3;
  --accent-hover:#0077ed;
  --warn:#ff9500;
  --good:#30d158;
  --purple:#bf5af2;
  --pink:#ff375f;
  --font-display:'SF Pro Display',-apple-system,BlinkMacSystemFont,'Inter',system-ui,sans-serif;
  --font-body:'SF Pro Text',-apple-system,BlinkMacSystemFont,'Inter','Segoe UI',Roboto,sans-serif;
  --font-mono:'SF Mono','JetBrains Mono',ui-monospace,Menlo,monospace;
}
*,*::before,*::after{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:var(--font-body);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;letter-spacing:-.011em;font-feature-settings:'ss01','cv11'}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.disp{font-family:var(--font-display);letter-spacing:-.024em}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}

/* ============= NAV Apple-style ============= */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:50;height:48px;
  display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:32px;padding:0 40px;
  background:rgba(251,251,253,0.82);
  backdrop-filter:saturate(180%) blur(20px);
  -webkit-backdrop-filter:saturate(180%) blur(20px);
  border-bottom:1px solid rgba(0,0,0,0.06);
}
.nav-logo{justify-self:start;display:flex;align-items:center}
.nav-logo img{height:22px;width:auto;filter:invert(1)}
.nav-center{display:flex;gap:32px;font-size:13px;font-weight:400;color:var(--text-dim)}
.nav-center a{transition:color .18s}
.nav-center a:hover{color:var(--text)}
.nav-right{justify-self:end;display:flex;gap:8px;align-items:center;font-size:13px}
.btn-signin{color:var(--text-dim);padding:6px 14px;font-weight:400}
.btn-signin:hover{color:var(--text)}
.btn-request{background:var(--accent);color:#fff;padding:7px 16px;border-radius:980px;font-weight:500;transition:background .15s}
.btn-request:hover{background:var(--accent-hover)}
.lang-toggle{display:inline-flex;gap:0;border:1px solid rgba(0,0,0,.1);border-radius:980px;overflow:hidden;font-size:12px;font-weight:500;background:#fff;margin-right:6px}
.lang-toggle a{padding:5px 12px;color:var(--text-mute);transition:background .15s,color .15s}
.lang-toggle a.active{background:var(--text);color:#fff}
.lang-toggle a:hover:not(.active){color:var(--text)}

/* ============= ARTICLE ============= */
article{max-width:720px;margin:0 auto;padding:130px 24px 100px}
.breadcrumb{font-size:13px;letter-spacing:-.005em;color:var(--accent);margin-bottom:24px;display:inline-flex;align-items:center;gap:4px}
.breadcrumb:hover{text-decoration:underline}
h1{
  font-family:var(--font-display);font-size:56px;font-weight:700;
  letter-spacing:-.035em;line-height:1.06;
  margin:0 0 24px;color:var(--text);
}
.meta{
  display:flex;gap:12px;align-items:center;flex-wrap:wrap;
  font-size:13px;color:var(--text-mute);letter-spacing:-.005em;
  margin-bottom:44px;padding-bottom:28px;border-bottom:1px solid var(--border);
}
.tag{background:rgba(0,113,227,.10);color:#0055b3;padding:4px 12px;border-radius:980px;font-weight:600;font-size:11px;letter-spacing:.02em;text-transform:uppercase}
.tag.aero{background:rgba(255,149,0,.13);color:#b56800}
.tag.gear{background:rgba(48,209,88,.14);color:#248a3d}
.tag.tp{background:rgba(191,90,242,.14);color:#8b3aa8}
.meta .sep::before{content:"·";margin:0 2px;color:var(--text-soft)}
.lead{
  font-family:var(--font-display);
  font-size:24px;line-height:1.42;color:var(--text-dim);
  margin:0 0 48px;font-weight:400;letter-spacing:-.014em;
}
h2{
  font-family:var(--font-display);font-size:36px;font-weight:700;
  letter-spacing:-.028em;line-height:1.14;margin:64px 0 20px;color:var(--text);
}
h3{
  font-family:var(--font-display);font-size:22px;font-weight:600;
  letter-spacing:-.018em;margin:40px 0 14px;color:var(--text);
}
p{
  font-size:19px;line-height:1.58;color:var(--text-dim);margin:0 0 22px;
  letter-spacing:-.007em;
}
ul,ol{padding-left:24px;font-size:19px;line-height:1.6;color:var(--text-dim);letter-spacing:-.007em}
li{margin-bottom:10px}
strong{color:var(--text);font-weight:600}
em{color:var(--text-dim);font-style:italic}
code{
  font-family:var(--font-mono);background:var(--bg-alt);
  padding:2px 8px;border-radius:6px;font-size:15.5px;color:#b56800;
}

/* ============= BOX / QUOTE ============= */
.box{
  background:var(--bg-alt);border-radius:14px;
  padding:24px 28px;margin:32px 0;
  font-size:17px;line-height:1.55;color:var(--text-dim);
  border-left:3px solid var(--accent);
}
.box b{color:var(--text);font-weight:600}
.box.formula{
  font-family:var(--font-mono);font-size:16px;
  text-align:center;padding:22px 24px;
}

/* ============= TABLE ============= */
.table-wrap{overflow-x:auto;margin:32px 0;border-radius:14px;border:1px solid var(--border)}
table{width:100%;border-collapse:collapse;font-size:14.5px;background:#fff}
th,td{padding:14px 18px;text-align:left;border-bottom:1px solid var(--border)}
tr:last-child td{border-bottom:none}
th{
  font-family:var(--font-display);font-size:12px;font-weight:600;
  letter-spacing:.02em;text-transform:uppercase;
  color:var(--text-mute);background:var(--bg-tint);
}
td{color:var(--text-dim)}
td.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}

/* ============= FIGURE / CHART ============= */
figure{margin:44px 0;padding:0}
figure.chart{
  background:var(--bg-tint);border:1px solid var(--border);
  border-radius:18px;padding:32px 28px 24px;
}
figure svg{width:100%;height:auto;display:block}
figcaption{
  font-size:13.5px;color:var(--text-mute);text-align:center;
  margin-top:14px;letter-spacing:-.005em;line-height:1.45;
}
figcaption b{color:var(--text-dim);font-weight:600}
figure.photo{margin:44px 0;border-radius:22px;overflow:hidden}
figure.photo img{width:100%;display:block}
figure.photo figcaption{padding:12px 4px 0;text-align:left}
figure.photo figcaption a{color:var(--accent)}

/* ============= HERO ART (SVG en fondo Apple-style) ============= */
figure.hero-art{
  margin:0 0 40px;border-radius:22px;overflow:hidden;
  aspect-ratio:16/7;position:relative;
  background:#000;
}
figure.hero-art svg{position:absolute;inset:0;width:100%;height:100%;display:block}
figure.hero-art figcaption{color:var(--text-soft);font-size:12px;padding:10px 4px 0;text-align:left}
figure.hero-art figcaption a{color:var(--accent)}

/* ============= CTA ============= */
.cta{
  background:linear-gradient(135deg,#0071e3 0%,#005bb5 100%);
  border-radius:22px;padding:44px 40px;margin:64px 0 20px;
  text-align:center;color:#fff;
}
.cta h3{margin:0 0 12px;font-family:var(--font-display);font-size:28px;font-weight:600;color:#fff;letter-spacing:-.022em}
.cta p{color:rgba(255,255,255,.9);margin:0 0 22px;font-size:17px;line-height:1.5}
.cta a{
  display:inline-block;background:#fff;color:#0071e3;
  padding:13px 30px;border-radius:980px;
  font-weight:600;font-size:15px;transition:transform .15s;
}
.cta a:hover{transform:scale(1.02)}

.refs{
  color:var(--text-mute);font-size:13px;
  margin-top:48px;padding-top:24px;border-top:1px solid var(--border);
  line-height:1.6;letter-spacing:-.005em;
}
.refs em{color:var(--text-dim)}

/* ============= FOOTER ============= */
footer{
  border-top:1px solid var(--border);
  padding:44px 40px;background:var(--bg-tint);
  text-align:center;font-size:13px;color:var(--text-mute);
}
footer a{color:var(--text-dim)}
footer a:hover{color:var(--text)}

/* ============= RESPONSIVE ============= */
@media (max-width:768px){
  .nav{padding:0 20px;grid-template-columns:auto auto}
  .nav-center{display:none}
  article{padding:100px 20px 60px}
  h1{font-size:38px}
  .lead{font-size:19px}
  h2{font-size:28px}
  h3{font-size:19px}
  p,ul,ol{font-size:17px}
  .cta{padding:32px 24px}
  .cta h3{font-size:22px}
  figure.photo{margin:32px -20px}
}