/* ============================================================
   Retenser mini-site — shared design system
   Tennis Sensei · brand shell extended for a modern product site
   ============================================================ */
:root{
  --accent:#0b5d3b;      /* Tennis Sensei green */
  --accent-2:#0f7a4e;    /* lighter green */
  --deep:#08402a;        /* hero deep green */
  --mint:#eaf4ee;        /* pale green wash */
  --clay:#e8792b;        /* energy accent (Retenser orange) */
  --gold:#c8912f;
  --ink:#16130f; --soft:#5c564d; --faint:#8f887c;
  --paper:#faf8f4; --card:#ffffff; --line:#e7e2d9;
  --shadow:0 2px 6px rgba(22,19,15,.06),0 18px 44px -18px rgba(22,19,15,.18);
  --shadow-lg:0 6px 14px rgba(22,19,15,.08),0 40px 80px -32px rgba(22,19,15,.30);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font:16px/1.7 ui-sans-serif,system-ui,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;color:var(--ink);background:var(--paper);-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:inherit}
.serif{font-family:"Iowan Old Style","Palatino Linotype",Palatino,Georgia,serif}
.wrap{max-width:1080px;margin:0 auto;padding:0 24px}
.narrow{max-width:780px;margin-left:auto;margin-right:auto}

/* ---------- store header ---------- */
header.top{position:sticky;top:0;z-index:40;background:rgba(250,248,244,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.topin{display:flex;align-items:center;gap:18px;height:60px;max-width:1080px;margin:0 auto;padding:0 24px}
.brand{font-weight:800;font-size:1.12rem;letter-spacing:-.01em;text-decoration:none}
.brand em{font-style:normal;color:var(--accent)}
nav.main{margin-left:auto;display:flex;gap:20px;font-size:.9rem}
nav.main a{text-decoration:none;color:var(--soft)}
nav.main a:hover{color:var(--ink)}

/* ---------- retenser sub-nav (the mini-site's own nav) ---------- */
.subnav{position:sticky;top:60px;z-index:35;background:rgba(255,255,255,.94);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.subin{display:flex;align-items:center;gap:22px;max-width:1080px;margin:0 auto;padding:0 24px;height:56px}
.rmark{font-family:"Iowan Old Style",Palatino,Georgia,serif;font-weight:800;font-size:1.15rem;letter-spacing:-.01em;text-decoration:none;color:var(--ink);display:flex;align-items:center;gap:8px}
.rmark::before{content:"";width:20px;height:20px;border-radius:50%;background:conic-gradient(from 140deg,var(--accent),var(--accent-2),var(--clay),var(--accent));box-shadow:inset 0 0 0 4px #fff}
.rlinks{display:flex;gap:4px;margin-left:6px}
.rlinks a{text-decoration:none;color:var(--soft);font-size:.9rem;font-weight:600;padding:8px 12px;border-radius:9px;transition:background .15s,color .15s}
.rlinks a:hover{background:var(--mint);color:var(--accent)}
.rlinks a.active{color:var(--accent);background:var(--mint)}
.rshop{margin-left:auto;text-decoration:none;font-weight:700;font-size:.88rem;color:#fff;background:var(--accent);padding:9px 18px;border-radius:10px;box-shadow:var(--shadow);transition:transform .15s}
.rshop:hover{transform:translateY(-1px)}
.rtoggle{display:none;margin-left:auto;background:none;border:1px solid var(--line);border-radius:9px;font-size:1.1rem;padding:6px 12px;cursor:pointer;color:var(--ink)}

/* ---------- hero ---------- */
.hero{position:relative;overflow:hidden;background:radial-gradient(120% 140% at 15% 0%,var(--accent-2) 0%,var(--accent) 42%,var(--deep) 100%);color:#f6f2ea}
.hero::after{content:"";position:absolute;inset:0;background:
   radial-gradient(60% 50% at 85% 20%,rgba(232,121,43,.20),transparent 60%),
   radial-gradient(50% 60% at 10% 90%,rgba(255,255,255,.08),transparent 60%);pointer-events:none}
.heroin{position:relative;z-index:1;max-width:1080px;margin:0 auto;padding:46px 24px 50px;display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center;text-align:center}
.hero .ey{display:inline-block;font-size:.72rem;font-weight:800;letter-spacing:.16em;text-transform:uppercase;color:#bfe6d0;border:1px solid rgba(255,255,255,.25);border-radius:999px;padding:5px 13px}
.hero h1{font-size:clamp(2.4rem,5.4vw,3.8rem);line-height:1.04;letter-spacing:-.02em;margin:0;text-wrap:balance;color:#fff}
.hero p.sub{margin:18px auto 0;max-width:32rem;color:#dcefe3;font-size:1.14rem}
.hero .cta{display:flex;flex-wrap:wrap;gap:14px;margin-top:30px;justify-content:center}
.hbadges{display:flex;flex-wrap:wrap;gap:8px;margin-top:26px}
.hbadges span{font-size:.76rem;font-weight:600;color:#eaf6ef;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.18);border-radius:999px;padding:6px 13px}
.hbadges b{color:#fff}
.hero-media{border-radius:20px;overflow:hidden;box-shadow:var(--shadow-lg);background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.14)}
.hero-media img{width:100%;height:100%;object-fit:cover;display:block}
.hero-ph{min-height:340px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;color:#eaf6ef;padding:34px 26px;
  border:2px dashed rgba(255,255,255,.35);border-radius:20px;background:rgba(255,255,255,.05)}
.hero-ph .tag{font-size:.68rem;font-weight:800;letter-spacing:.14em;text-transform:uppercase;color:#0b5d3b;background:#fff;border-radius:999px;padding:4px 12px;margin-bottom:12px}
.hero-ph .ttl{font-weight:700;color:#fff;font-size:1.02rem;margin-bottom:6px}
.hero-ph .desc{font-size:.86rem;max-width:22rem;color:#cfe6d8}

.btn{display:inline-flex;align-items:center;gap:8px;text-decoration:none;font-weight:700;padding:14px 26px;border-radius:12px;transition:transform .15s,opacity .15s,box-shadow .15s}
.btn.solid{background:#fff;color:var(--accent);box-shadow:var(--shadow)}
.btn.solid.green{background:var(--accent);color:#fff}
.btn.ghost{border:1.6px solid rgba(255,255,255,.5);color:#fff}
.btn.dark{border:1.6px solid var(--ink);color:var(--ink)}
.btn:hover{transform:translateY(-2px)}

/* ---------- generic section ---------- */
section.band{padding:66px 0}
section.band.tint{background:linear-gradient(180deg,#fff, #fbf9f5)}
section.band.mint{background:var(--mint)}
.eyebrow{font-size:.72rem;font-weight:800;letter-spacing:.15em;text-transform:uppercase;color:var(--accent);display:block;text-align:center}
.h-sec{font-size:clamp(1.7rem,3.4vw,2.4rem);line-height:1.12;letter-spacing:-.02em;margin:12px 0 0;text-wrap:balance;text-align:center}
.lede{margin:16px 0 0;color:var(--soft);font-size:1.1rem;max-width:44rem}
.center{text-align:center}.center .lede{margin-left:auto;margin-right:auto}

/* ---------- stat band ---------- */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:8px}
.stat{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:26px 20px;text-align:center;box-shadow:var(--shadow)}
.stat .num{font-family:"Iowan Old Style",Georgia,serif;font-size:2.2rem;line-height:1;color:var(--accent);font-weight:700}
.stat .lab{margin-top:8px;font-size:.86rem;color:var(--soft)}

/* ---------- feature cards ---------- */
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:34px}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:22px;margin-top:34px}
.fcard{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:26px 24px;box-shadow:var(--shadow);transition:transform .2s,box-shadow .2s}
.fcard:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
.fcard .ic{width:44px;height:44px;border-radius:12px;background:var(--mint);color:var(--accent);display:flex;align-items:center;justify-content:center;font-size:1.3rem;margin-bottom:14px}
.fcard h3{font-size:1.12rem;letter-spacing:-.01em;margin-bottom:6px}
.fcard p{color:var(--soft);font-size:.96rem}

/* ---------- article / prose ---------- */
article p{margin:0 0 18px;font-size:1.06rem}
article h2{font-size:1.55rem;letter-spacing:-.01em;margin:40px 0 14px}
article h3{font-size:1.08rem;margin:24px 0 8px}
article strong{color:var(--ink)}

/* pull quote */
.pull{margin:30px 0;padding:22px 26px;border-left:4px solid var(--accent);background:var(--mint);border-radius:0 14px 14px 0;font-family:"Iowan Old Style",Georgia,serif;font-size:1.28rem;line-height:1.4;color:var(--ink)}
.pull cite{display:block;margin-top:10px;font-family:ui-sans-serif,system-ui,sans-serif;font-style:normal;font-size:.86rem;color:var(--soft)}

/* image figures */
.figure{margin:14px 0 30px;border-radius:18px;overflow:hidden;box-shadow:var(--shadow);background:var(--line)}
.figure img{width:100%;height:auto}
.duo{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin:14px 0 30px}
.duo figure{border-radius:16px;overflow:hidden;box-shadow:var(--shadow);background:var(--line)}
.duo figcaption{padding:10px 14px;font-size:.82rem;color:var(--soft);background:var(--card)}

/* ---------- placeholders ---------- */
.ph{border:2px dashed #c9c0b1;border-radius:16px;background:repeating-linear-gradient(135deg,#f4f0e8,#f4f0e8 12px,#efeae0 12px,#efeae0 24px);
    display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:38px 22px;margin:14px 0 30px;color:var(--soft)}
.ph .tag{font-size:.68rem;font-weight:800;letter-spacing:.14em;text-transform:uppercase;color:var(--accent);background:#fff;border:1px solid var(--line);border-radius:999px;padding:4px 12px;margin-bottom:12px}
.ph .ttl{font-weight:700;color:var(--ink);font-size:1rem;margin-bottom:4px}
.ph .desc{font-size:.86rem;max-width:30rem}
.ph.wide{min-height:240px}
.ph.short{min-height:150px;padding:26px 22px}
.phduo{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin:14px 0 30px}
.phduo .ph{margin:0}

/* ---------- steps ---------- */
.steps{counter-reset:step;list-style:none;margin:8px 0 28px;padding:0;display:grid;gap:14px}
.steps li{position:relative;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:18px 20px 18px 64px;font-size:1rem;box-shadow:var(--shadow)}
.steps li::before{counter-increment:step;content:counter(step);position:absolute;left:18px;top:17px;width:32px;height:32px;border-radius:50%;background:var(--accent);color:#fff;font-weight:800;font-size:.95rem;display:flex;align-items:center;justify-content:center}
.steps li strong{display:block;margin-bottom:2px}

/* ---------- facts list ---------- */
.facts{list-style:none;margin:8px 0 28px;padding:0;display:grid;gap:12px}
.facts li{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:15px 18px;font-size:1rem}
.facts li strong{color:var(--accent)}

/* ---------- comparison table ---------- */
.cmp{width:100%;border-collapse:collapse;margin:14px 0 24px;font-size:.96rem;background:var(--card);border:1px solid var(--line);border-radius:14px;overflow:hidden;box-shadow:var(--shadow)}
.cmp th,.cmp td{text-align:left;padding:14px 16px;border-bottom:1px solid var(--line);vertical-align:top}
.cmp thead th{background:var(--accent);color:#fff;font-size:.82rem;text-transform:uppercase;letter-spacing:.04em}
.cmp tr:last-child td{border-bottom:none}
.cmp td:first-child{font-weight:600}
.dot{display:inline-block;width:12px;height:12px;border-radius:50%;margin-right:8px;vertical-align:-1px;border:1px solid rgba(0,0,0,.15)}

/* spec table */
.spec{width:100%;border-collapse:collapse;margin:14px 0 24px;font-size:.95rem;background:var(--card);border:1px solid var(--line);border-radius:14px;overflow:hidden;box-shadow:var(--shadow)}
.spec th,.spec td{text-align:left;padding:13px 16px;border-bottom:1px solid var(--line)}
.spec tr:last-child td,.spec tr:last-child th{border-bottom:none}
.spec th{width:42%;font-weight:600;color:var(--soft);background:#faf8f3}

/* ---------- FAQ accordion ---------- */
.faq{margin:14px 0 24px;border:1px solid var(--line);border-radius:14px;overflow:hidden;background:var(--card);box-shadow:var(--shadow)}
.faq details{border-bottom:1px solid var(--line)}
.faq details:last-child{border-bottom:none}
.faq summary{cursor:pointer;list-style:none;padding:17px 20px;font-weight:600;font-size:1.02rem;display:flex;align-items:center;gap:12px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::before{content:"+";color:var(--accent);font-weight:800;font-size:1.3rem;line-height:1;width:16px;flex:none;transition:transform .2s}
.faq details[open] summary::before{content:"\2212"}
.faq .ans{padding:0 20px 18px 48px;color:var(--soft);font-size:.98rem}
.faq .ans p{font-size:.98rem;margin:0 0 10px}
.faq .ans p:last-child{margin:0}

/* ---------- CTA band ---------- */
.ctaband{background:linear-gradient(120deg,var(--accent),var(--deep));color:#fff;border-radius:22px;padding:48px 40px;text-align:center;box-shadow:var(--shadow-lg);margin:8px 0}
.ctaband h2{font-size:clamp(1.6rem,3vw,2.2rem);letter-spacing:-.02em;color:#fff}
.ctaband p{margin:12px auto 0;max-width:34rem;color:#dcefe3}
.ctaband .cta{display:flex;flex-wrap:wrap;gap:14px;justify-content:center;margin-top:26px}

/* ---------- "next up" journey cards ---------- */
.next{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:14px}
.next a{display:block;text-decoration:none;background:var(--card);border:1px solid var(--line);border-radius:16px;padding:22px 24px;box-shadow:var(--shadow);transition:transform .18s,box-shadow .18s}
.next a:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg)}
.next .k{font-size:.7rem;font-weight:800;letter-spacing:.14em;text-transform:uppercase;color:var(--faint)}
.next .t{font-size:1.16rem;font-weight:700;margin:6px 0 2px;color:var(--ink)}
.next .t .arw{color:var(--accent);transition:transform .18s;display:inline-block}
.next a:hover .arw{transform:translateX(4px)}
.next .d{font-size:.92rem;color:var(--soft)}

.note{font-size:.82rem;color:var(--faint);text-align:center;margin:22px 0 0}

/* ---------- footer ---------- */
footer.rfoot{background:#12100c;color:#b7b1a5;margin-top:0;padding:44px 0 34px}
.rfoot .cols{display:flex;flex-wrap:wrap;gap:40px;justify-content:space-between;max-width:1080px;margin:0 auto;padding:0 24px}
.rfoot .fmark{font-family:"Iowan Old Style",Georgia,serif;font-weight:800;font-size:1.3rem;color:#fff}
.rfoot .fmark span{color:#7fd0a4}
.rfoot .ftag{margin-top:8px;font-size:.9rem;max-width:22rem;color:#8f887c}
.rfoot nav{display:flex;flex-direction:column;gap:8px}
.rfoot nav b{color:#fff;font-size:.8rem;letter-spacing:.1em;text-transform:uppercase;margin-bottom:4px}
.rfoot nav a{text-decoration:none;color:#b7b1a5;font-size:.92rem}
.rfoot nav a:hover{color:#fff}
.rfoot .base{max-width:1080px;margin:28px auto 0;padding:20px 24px 0;border-top:1px solid #2a271f;font-size:.82rem;color:#7a7468;display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between}

/* ---------- reveal on scroll ---------- */
.reveal{opacity:0;transform:translateY(18px);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}}

/* ---------- responsive ---------- */
@media(max-width:900px){
  .heroin{grid-template-columns:1fr;gap:26px;padding:36px 24px 40px}
  .grid3{grid-template-columns:1fr 1fr}
  .stats{grid-template-columns:1fr 1fr}
}
@media(max-width:640px){
  nav.main{display:none}
  .rlinks{display:none;position:absolute;top:56px;left:0;right:0;flex-direction:column;background:#fff;border-bottom:1px solid var(--line);padding:10px 16px;gap:2px;box-shadow:var(--shadow)}
  .subnav.open .rlinks{display:flex}
  .rtoggle{display:block}
  .rshop{display:none}
  .subnav.open .rshop{display:inline-block;margin:8px 16px 12px;text-align:center}
  .grid3,.grid2,.duo,.phduo,.next{grid-template-columns:1fr}
  .stats{grid-template-columns:1fr 1fr}
  .ctaband{padding:36px 24px}
  .spec th{width:auto}
}