/* Cellsius shared styles — used by learn.html and the protocol pages.
   index.html and about.html carry their own inline styles. */
:root{
  --green:#00e676; --green-glow:rgba(0,230,118,0.35); --teal:#00cfa7; --amber:#ffc53d; --red:#ff6b6b;
  --dark:#001410; --dark2:#00201a; --dark3:#012c23; --panel:rgba(0,230,118,0.035);
  --text:#eafff4; --muted:rgba(234,255,244,0.58); --muted2:rgba(234,255,244,0.38);
  --border:rgba(0,230,118,0.16); --border-hi:rgba(0,230,118,0.4); --radius:16px; --maxw:1080px;
}
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{background:var(--dark);color:var(--text);font-family:'Inter',system-ui,sans-serif;overflow-x:hidden;-webkit-font-smoothing:antialiased;line-height:1.65}
a{color:inherit;text-decoration:none}
img,svg{max-width:100%;display:block}
button{font-family:inherit;cursor:pointer;border:none}
body::before{content:'';position:fixed;inset:0;z-index:0;pointer-events:none;background:radial-gradient(600px 600px at 80% -5%,rgba(0,230,118,0.10),transparent 70%),radial-gradient(500px 500px at 5% 15%,rgba(0,207,167,0.08),transparent 70%)}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px;position:relative;z-index:1}

/* NAV */
nav{position:sticky;top:0;z-index:100;background:rgba(0,20,16,0.82);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--border)}
.nav-inner{max-width:1180px;margin:0 auto;padding:14px 24px;display:flex;align-items:center;gap:28px}
.logo{display:flex;align-items:center;gap:10px;font-family:'Space Grotesk',sans-serif;font-weight:700;font-size:1.35rem;letter-spacing:-0.02em}
.logo .mark{font-size:1.5rem}.logo b{color:var(--green)}
.nav-links{display:flex;gap:22px;margin-left:auto;align-items:center}
.nav-links a{color:var(--muted);font-size:0.92rem;font-weight:500;transition:color .2s}
.nav-links a:hover{color:var(--green)}
.nav-links a.cta{color:var(--green);border:1px solid var(--border-hi);border-radius:999px;padding:8px 16px;font-weight:600}
.nav-links a.cta:hover{background:var(--green);color:#002014}
@media(max-width:640px){.nav-links{display:none}}

/* HEADINGS / PROSE */
.kicker{font-family:'Space Mono',monospace;font-size:0.78rem;letter-spacing:0.14em;text-transform:uppercase;color:var(--teal)}
h1{font-family:'Space Grotesk',sans-serif;font-weight:700;font-size:clamp(2.1rem,5vw,3.4rem);line-height:1.06;letter-spacing:-0.03em}
h1 em{font-style:normal;color:var(--green)}
h2{font-family:'Space Grotesk',sans-serif;font-weight:700;font-size:clamp(1.5rem,3.2vw,2.2rem);letter-spacing:-0.02em}
h3{font-family:'Space Grotesk',sans-serif;font-weight:600}
section{padding:44px 0;position:relative}
.lead{font-size:clamp(1.05rem,2vw,1.28rem);color:var(--muted);max-width:62ch}
.prose p{color:var(--muted);margin-bottom:16px;font-size:1.02rem}
.prose p strong{color:var(--text)}
.prose a{color:var(--green);text-decoration:underline;text-underline-offset:2px}

header.page{padding:64px 0 32px}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-family:'Space Mono',monospace;font-size:0.78rem;letter-spacing:0.14em;text-transform:uppercase;color:var(--green);border:1px solid var(--border);padding:6px 14px;border-radius:999px;background:var(--panel);margin-bottom:22px}

/* BREADCRUMB */
.crumbs{display:flex;gap:8px;align-items:center;color:var(--muted2);font-size:0.85rem;margin-bottom:18px;flex-wrap:wrap}
.crumbs a:hover{color:var(--green)}
.crumbs span{opacity:.5}

/* BUTTONS */
.btn{display:inline-flex;align-items:center;gap:9px;padding:13px 24px;border-radius:999px;font-weight:600;font-size:0.96rem;transition:all .2s;border:1px solid transparent}
.btn-primary{background:var(--green);color:#002014;box-shadow:0 8px 30px var(--green-glow)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 40px var(--green-glow)}
.btn-ghost{background:transparent;color:var(--text);border-color:var(--border-hi)}
.btn-ghost:hover{background:var(--panel);border-color:var(--green);color:var(--green)}

/* LEARN: tier columns */
.tier-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.tier-col{background:linear-gradient(180deg,rgba(0,230,118,0.05),rgba(0,230,118,0.01));border:1px solid var(--border);border-radius:var(--radius);padding:24px}
.tier-col .tier-tag{font-family:'Space Mono',monospace;font-size:0.7rem;letter-spacing:0.12em;text-transform:uppercase;color:var(--amber)}
.tier-col h3{font-size:1.25rem;margin:6px 0 6px}
.tier-col .tier-blurb{color:var(--muted);font-size:0.88rem;margin-bottom:16px}
.plink{display:flex;align-items:center;gap:12px;padding:12px 14px;border:1px solid var(--border);border-radius:12px;margin-bottom:10px;background:rgba(0,0,0,0.15);transition:all .18s}
.plink:hover{border-color:var(--border-hi);background:var(--panel);transform:translateX(3px)}
.plink .num{width:26px;height:26px;border-radius:50%;border:2px solid var(--green);display:flex;align-items:center;justify-content:center;font-size:0.8rem;color:var(--green);font-weight:700;flex-shrink:0}
.plink .pl-body{flex:1;min-width:0}
.plink .pl-body b{display:block;font-family:'Space Grotesk',sans-serif;font-size:0.95rem}
.plink .pl-body span{font-size:0.78rem;color:var(--muted2)}
.plink .arrow{color:var(--muted2)}
.plink:hover .arrow{color:var(--green)}
.plink.soon{opacity:.55}
.plink.soon:hover{transform:none;border-color:var(--border)}

/* CARDS GRID (guides / bands) */
.cards2{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.infocard{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);padding:28px;transition:border-color .2s}
.infocard:hover{border-color:var(--border-hi)}
.infocard .ic{font-size:1.9rem;margin-bottom:12px}
.infocard h3{font-size:1.15rem;margin-bottom:8px}
.infocard p{color:var(--muted);font-size:0.94rem}

/* PROTOCOL META */
.meta-row{display:flex;flex-wrap:wrap;gap:12px;margin:22px 0 6px}
.chip{display:inline-flex;align-items:center;gap:7px;border:1px solid var(--border);border-radius:999px;padding:7px 14px;font-size:0.85rem;color:var(--text);background:var(--panel)}
.chip b{color:var(--green);font-family:'Space Grotesk',sans-serif}
.chip.diff-beginner b{color:var(--green)}
.chip.diff-intermediate b{color:var(--amber)}

/* PROTOCOL BODY */
.protocol{display:grid;grid-template-columns:1fr;gap:8px;max-width:800px}
.block{margin:30px 0}
.block h2{margin-bottom:14px}
.mats{list-style:none;display:grid;grid-template-columns:1fr 1fr;gap:10px}
.mats li{display:flex;gap:10px;align-items:flex-start;font-size:0.95rem;color:var(--text);background:var(--panel);border:1px solid var(--border);border-radius:10px;padding:11px 14px}
.mats li .b{color:var(--green);flex-shrink:0}
.callout{border-radius:12px;padding:18px 20px;display:flex;gap:12px;align-items:flex-start;font-size:0.95rem}
.callout.safe{background:rgba(255,107,107,0.06);border:1px solid rgba(255,107,107,0.3)}
.callout.safe .ic{color:var(--red)}
.callout.tip{background:rgba(0,230,118,0.06);border:1px solid var(--border-hi)}
.callout.tip .ic{color:var(--green)}
.callout .ic{font-size:1.2rem;flex-shrink:0}
.callout b{color:var(--text)}
.steps{list-style:none;counter-reset:s;display:flex;flex-direction:column;gap:16px}
.steps>li{counter-increment:s;position:relative;padding:18px 20px 18px 62px;border:1px solid var(--border);border-radius:12px;background:var(--panel)}
.steps>li::before{content:counter(s);position:absolute;left:16px;top:16px;width:32px;height:32px;border-radius:50%;background:var(--green);color:#002014;font-family:'Space Grotesk',sans-serif;font-weight:700;display:flex;align-items:center;justify-content:center}
.steps>li h4{font-family:'Space Grotesk',sans-serif;font-size:1.02rem;margin-bottom:5px}
.steps>li p{color:var(--muted);font-size:0.94rem}
.tbl{width:100%;border-collapse:collapse;font-size:0.92rem}
.tbl th,.tbl td{text-align:left;padding:12px 14px;border-bottom:1px solid var(--border);vertical-align:top}
.tbl th{color:var(--muted2);font-weight:600;font-size:0.8rem;text-transform:uppercase;letter-spacing:0.06em}
.tbl td b{color:var(--amber)}

/* KIT CTA */
.kit-cta{background:linear-gradient(135deg,rgba(0,230,118,0.08),rgba(0,207,167,0.03));border:1px solid var(--border-hi);border-radius:var(--radius);padding:28px;display:flex;gap:20px;align-items:center;flex-wrap:wrap}
.kit-cta .kc-art{width:70px;height:70px;flex-shrink:0}
.kit-cta .kc-body{flex:1;min-width:220px}
.kit-cta h3{font-size:1.15rem;margin-bottom:4px}
.kit-cta p{color:var(--muted);font-size:0.92rem}

/* PREV / NEXT */
.pager{display:flex;justify-content:space-between;gap:14px;margin-top:36px;flex-wrap:wrap}
.pager a{flex:1;min-width:200px;border:1px solid var(--border);border-radius:12px;padding:16px 18px;transition:border-color .2s}
.pager a:hover{border-color:var(--border-hi)}
.pager .lbl{font-size:0.75rem;color:var(--muted2);text-transform:uppercase;letter-spacing:0.08em}
.pager b{font-family:'Space Grotesk',sans-serif;font-weight:600;display:block;margin-top:3px}
.pager .next{text-align:right}

/* CTA BAND */
.cta-band{text-align:center;background:linear-gradient(135deg,rgba(0,230,118,0.08),rgba(0,207,167,0.04));border:1px solid var(--border);border-radius:var(--radius);padding:48px 32px}
.cta-band h2{margin-bottom:12px}
.cta-band p{color:var(--muted);margin:0 auto 24px;max-width:52ch}

/* FOOTER */
footer{border-top:1px solid var(--border);padding:40px 0;margin-top:36px}
.foot-bottom{display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;color:var(--muted2);font-size:0.84rem}
.foot-bottom a{color:var(--muted)}.foot-bottom a:hover{color:var(--green)}

@media(max-width:820px){.tier-grid,.cards2{grid-template-columns:1fr}.mats{grid-template-columns:1fr}}