:root{
  --bg:#f4f7f7;
  --surface:#ffffff;
  --ink:#101820;
  --muted:#64737a;
  --line:#dde5e8;
  --accent:#ff4d2e;
  --teal:#00a7a0;
  --good:#2e8f6b;
  --display:"Barlow Condensed","Oswald",sans-serif;
  --sans:"Karla","Helvetica Neue",system-ui,sans-serif;
  --pad:clamp(18px,4vw,44px);
  --radius:16px;
  --shadow:0 14px 36px rgba(16,24,32,.09);
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);font-weight:400;line-height:1.55;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto}
h1,h2,h3{font-family:var(--display);font-weight:700;line-height:1.05;margin:0 0 .4em;letter-spacing:.01em;text-transform:uppercase}
h1{font-size:clamp(2.3rem,6vw,4rem);letter-spacing:.005em}
h2{font-size:1.9rem}
h3{font-size:1.35rem}
p{margin:0 0 1em}
a{color:var(--teal);font-weight:600}
a:hover{text-decoration:none}
.tool-hero{position:relative;overflow:hidden}
.tool-hero:before{content:"";position:absolute;inset:0;background:
  repeating-linear-gradient(-45deg,transparent 0 22px,rgba(16,24,32,.025) 22px 23px),
  radial-gradient(55% 60% at 90% -5%,rgba(255,77,46,.10),transparent 60%);pointer-events:none}
.tool-hero:after{content:"";position:absolute;left:0;right:0;top:0;height:7px;background:linear-gradient(90deg,var(--accent) 0 33%,var(--teal) 33% 66%,#101820 66%)}
.wrap{max-width:1180px;margin:0 auto;padding:0 var(--pad)}
/* Header */
.site-head{position:sticky;top:0;z-index:50;background:rgba(244,247,247,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.head-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-top:13px;padding-bottom:13px}
.brand{display:inline-flex;align-items:center;gap:11px;text-decoration:none;color:var(--ink)}
.brand .logo{width:38px;height:38px;display:block;border-radius:4px}
.brand-name{font-family:var(--display);font-weight:700;font-size:1.5rem;text-transform:uppercase;letter-spacing:.02em}
.brand-name em{font-style:normal;color:var(--accent)}
.site-nav ul{display:flex;gap:4px;list-style:none;margin:0;padding:0}
.site-nav a{display:inline-block;padding:9px 15px;border-radius:999px;text-decoration:none;color:var(--ink);font-weight:600;font-size:.93rem}
.site-nav a:hover{background:var(--surface);color:var(--accent)}
/* Hero header */
.tool-hd{position:relative;padding-top:42px;padding-bottom:8px;max-width:780px}
.tool-hd h1{margin-bottom:.12em}
.tool-hd p{color:var(--muted);font-size:1.08rem}
.eyebrow{display:inline-block;font-weight:700;font-size:.78rem;letter-spacing:.22em;text-transform:uppercase;color:var(--teal);margin-bottom:.6em}
/* Layout */
.grid2{display:grid;grid-template-columns:minmax(0,46%) minmax(0,1fr);gap:20px;align-items:start}
@media(max-width:960px){.grid2{grid-template-columns:1fr}}
.panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow)}
.panel h4{font-family:var(--display);font-size:1.3rem;text-transform:uppercase;margin:0 0 .2em}
.panel .sub{color:var(--muted);font-size:.9rem;margin-bottom:18px}
.field{margin-bottom:16px}
.field>label{display:block;font-weight:700;font-size:.84rem;margin-bottom:7px;letter-spacing:.02em}
input[type=number],input[type=text]{
  width:100%;padding:12px 14px;border:1.5px solid var(--line);border-radius:10px;background:#fff;color:var(--ink);
  font-family:var(--sans);font-size:1rem;appearance:none;transition:.15s;font-weight:600
}
input:focus{outline:none;border-color:var(--teal);box-shadow:0 0 0 3px rgba(0,167,160,.14)}
.hms{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;align-items:end}
.hms .field{margin-bottom:0}
.hms label{font-size:.72rem;color:var(--muted)}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
@media(max-width:520px){.row2{grid-template-columns:1fr}}
/* Segmented */
.seg{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.seg input{position:absolute;opacity:0}
.seg label{display:flex;align-items:center;justify-content:center;text-align:center;padding:12px 8px;border:1.5px solid var(--line);border-radius:10px;background:#fff;cursor:pointer;font-weight:700;font-size:.84rem;font-family:var(--display);text-transform:uppercase;transition:.15s}
.seg input:checked+label{border-color:var(--ink);background:var(--ink);color:#fff}
.seg label:hover{border-color:var(--teal)}
/* Distance presets */
.presets{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}
.presets input{position:absolute;opacity:0}
.presets label{display:flex;align-items:center;justify-content:center;padding:11px 6px;border:1.5px solid var(--line);border-radius:10px;background:#fff;cursor:pointer;font-weight:700;font-size:.82rem;font-family:var(--display);text-transform:uppercase;transition:.15s}
.presets input:checked+label{border-color:var(--accent);background:#ffe9e3;color:#c63a20}
.presets label:hover{border-color:var(--accent)}
@media(max-width:560px){.presets{grid-template-columns:1fr 1fr}}
/* Mode input groups */
.in-pace,.in-time,.in-dist{display:none;animation:fade .25s ease}
.in-pace.active,.in-time.active,.in-dist.active{display:block}
@keyframes fade{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}
/* Unit toggle */
.units{display:inline-flex;overflow:hidden;border:1.5px solid var(--line);border-radius:999px}
.units button{border:none;background:transparent;padding:8px 16px;font-family:var(--display);font-weight:700;font-size:.85rem;text-transform:uppercase;cursor:pointer;color:var(--muted)}
.units button.active{background:var(--ink);color:#fff}
/* Result */
.pace-result{display:flex;align-items:center;gap:18px;background:var(--ink);color:#fff;border-radius:14px;padding:22px 24px;margin-top:6px;flex-wrap:wrap}
.pace-result .v{font-family:var(--display);font-weight:700;font-size:3rem;line-height:1}
.pace-result .v small{font-size:1.3rem;color:#b8c4c8}
.pace-result .l{color:#b8c4c8;font-size:.9rem;flex:1;min-width:150px}
/* Prediction */
.pred-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:14px}
@media(max-width:900px){.pred-grid{grid-template-columns:1fr 1fr}}
.pred{border:1px solid var(--line);border-radius:12px;padding:16px 14px;background:#fff}
.pred .d{font-family:var(--display);font-weight:700;font-size:1rem;text-transform:uppercase;color:var(--muted)}
.pred .t{font-family:var(--display);font-weight:700;font-size:1.7rem;line-height:1}
.pred .p{font-family:var(--display);font-weight:700;font-size:.8rem;color:var(--teal);text-transform:uppercase;margin-top:8px}
.pred.hl{border-color:var(--accent);background:#fff2ee}
.pred.hl .d{color:var(--accent)}
/* Pace table */
table{width:100%;border-collapse:collapse;margin-top:8px;font-size:.9rem}
th,td{text-align:center;padding:10px 8px;border-bottom:1px solid var(--line)}
th{background:var(--ink);color:#fff;font-family:var(--display);font-weight:700;text-transform:uppercase;font-size:.8rem;letter-spacing:.04em}
th:first-child,td:first-child{text-align:left}
tr:nth-child(even) td{background:#f6f9f9}
.tbl-scroll{overflow:auto;border:1px solid var(--line);border-radius:12px}
/* Buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:13px 22px;border-radius:10px;border:none;background:var(--accent);color:#fff;font-family:var(--sans);font-weight:700;font-size:1rem;cursor:pointer;text-decoration:none;min-height:44px;transition:.15s}
.btn:hover{background:#d63d1f}
/* Content / article */
.page{padding:54px 0 66px}
.page-narrow{max-width:800px}
.page-lede{font-size:1.08rem;color:var(--muted);max-width:660px}
.article-list{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;margin-top:30px}
@media(max-width:760px){.article-list{grid-template-columns:1fr}}
.article-card{display:block;background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:22px;text-decoration:none;color:var(--ink);transition:.18s;box-shadow:var(--shadow)}
.article-card:hover{border-color:var(--accent);transform:translateY(-3px)}
.article-card h2{font-size:1.35rem;margin-bottom:.4em}
.article-card p{color:var(--muted);font-size:.94rem;margin:0}
.article-body h2{margin-top:1.7em}
.article-body ul,.article-body ol{padding-left:1.2em}
.article-body li{margin-bottom:.5em}
th,td{border:1px solid var(--line)}
.quote{border-left:4px solid var(--accent);background:var(--surface);border-radius:0 12px 12px 0;padding:16px 20px;margin:1.4em 0;color:var(--muted)}
.article-meta{display:flex;gap:12px;color:var(--muted);font-size:.85rem;margin:0 0 1.6em;flex-wrap:wrap}
.article-meta span{background:var(--surface);border:1px solid var(--line);border-radius:999px;padding:5px 12px}
/* Footer */
.site-foot{border-top:1px solid var(--line);background:var(--surface)}
.foot-grid{display:flex;align-items:flex-start;justify-content:space-between;gap:18px;padding-top:34px;padding-bottom:26px;flex-wrap:wrap}
.foot-brand{font-family:var(--display);font-weight:700;text-transform:uppercase;font-size:1.2rem;margin:0}
.site-foot nav ul{display:flex;gap:6px;list-style:none;margin:0;padding:0;flex-wrap:wrap}
.site-foot nav a{display:inline-block;padding:7px 11px;border-radius:999px;color:var(--muted);text-decoration:none;font-size:.9rem}
.site-foot nav a:hover{background:var(--bg);color:var(--accent)}
.foot-legal{border-top:1px dashed var(--line);padding:16px var(--pad);color:var(--muted);font-size:.82rem;text-align:center}
/* Cookie banner */
.cookie-banner{position:fixed;left:16px;right:16px;bottom:16px;z-index:100;display:none;align-items:center;gap:14px;justify-content:space-between;flex-wrap:wrap;background:var(--ink);color:#fff;border-radius:14px;padding:14px 18px;box-shadow:var(--shadow);max-width:640px;margin:0 auto}
.cookie-banner p{margin:0;font-size:.9rem;flex:1;min-width:220px}
.cookie-banner button{border:none;border-radius:10px;padding:9px 16px;font-family:var(--sans);font-weight:700;font-size:.9rem;cursor:pointer;min-height:40px}
#cookie-accept{background:var(--accent);color:#fff}
#cookie-decline{background:transparent;color:#cfc7c2;border:1px solid #444}
/* Responsive menu */
.menu-btn{display:none}
@media(max-width:640px){
  header:has(.menu-btn) .site-nav{position:relative}
  .menu-btn{display:none}
  header:has(.menu-btn) .menu-btn{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:0 16px;border:1.5px solid var(--line);background:var(--surface);border-radius:10px;font-family:var(--sans);font-weight:700;font-size:.9rem;cursor:pointer;color:var(--ink)}
  header:has(.menu-btn) #nav-menu{display:none;position:absolute;right:0;top:calc(100% + 8px);background:var(--surface);border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow);min-width:200px;z-index:60;padding:8px}
  header:has(.menu-btn) #nav-menu.open{display:block}
  header:has(.menu-btn) .site-nav ul{flex-direction:column;gap:0}
  header:has(.menu-btn) .site-nav a{display:block;border-radius:10px}
}
@media(prefers-reduced-motion:reduce){*{transition:none!important}}