/* Prestige Industries Limited — Eco-Social R&D Labs
   Static, mobile-first, WCAG 2.1 AA target. No frameworks. */

:root{
  --green:#0B5D3B;          /* deep eco anchor */
  --green-700:#0E7A4E;
  --green-050:#E8F0EB;
  --ink:#10141A;            /* charcoal */
  --muted:#5B6470;
  --paper:#F5F7F4;
  --card:#FFFFFF;
  --gold:#C9A227;           /* accent (not for body text) */
  --line:#DCE3DD;
  --radius:14px;
  --shadow:0 1px 2px rgba(16,20,26,.06),0 10px 30px rgba(16,20,26,.06);
  --maxw:1120px;
  --f:system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --watermark:.12;          /* fixed background logo strength — lower = fainter */
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;background:var(--paper)}
body{margin:0;font-family:var(--f);color:var(--ink);background:transparent;line-height:1.6;
  -webkit-font-smoothing:antialiased}

/* Fixed background watermark — content scrolls over the top.
   Black is already knocked out of the PNG; strength is one number: --watermark */
body::before{content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;
  background:url("/logo-watermark.png") center center no-repeat;
  background-size:min(118vmin,1050px);
  opacity:var(--watermark,.12)}
h1,h2,h3{line-height:1.15;margin:0 0 .5em;letter-spacing:-.01em}
h1{font-size:clamp(1.9rem,4.4vw,3.1rem)}
h2{font-size:clamp(1.5rem,3vw,2.15rem)}
h3{font-size:1.12rem}
p{margin:0 0 1rem}
a{color:var(--green);text-underline-offset:3px}
a:hover{color:var(--green-700)}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px}
.eyebrow{text-transform:uppercase;letter-spacing:.14em;font-size:.76rem;font-weight:700;color:var(--green);
  margin-bottom:.6rem}
.section-lead{max-width:62ch;font-size:1.06rem;color:var(--muted)}
.fineprint{font-size:.82rem;color:var(--muted)}
.todo{color:#B4531E;font-weight:700}

.skip{position:absolute;left:-999px;top:0;background:var(--ink);color:#fff;padding:10px 14px;z-index:99}
.skip:focus{left:8px;top:8px}

/* Header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(245,247,244,.92);
  backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:66px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink)}
.brand-text{display:flex;flex-direction:column;line-height:1.1}
.brand-text strong{font-size:.98rem}
.brand-text em{font-style:normal;font-size:.72rem;letter-spacing:.08em;text-transform:uppercase;color:var(--green)}
.nav{display:flex;align-items:center;gap:20px;flex-wrap:wrap}
.nav a{text-decoration:none;font-weight:600;font-size:.92rem;color:var(--ink)}
.nav a:hover{color:var(--green)}
.nav-cta{background:var(--green);color:#fff !important;padding:9px 15px;border-radius:999px}
.nav-cta:hover{background:var(--green-700)}

/* Hero */
.hero{background:linear-gradient(180deg,rgba(232,240,235,.80),rgba(245,247,244,.45));border-bottom:1px solid var(--line)}
.hero-grid{display:grid;grid-template-columns:1.5fr 1fr;gap:38px;padding:60px 0;align-items:start}
.hero h1{max-width:20ch}
.lead{font-size:1.1rem;color:#2A3138;max-width:60ch}
.cta-row{display:flex;gap:12px;flex-wrap:wrap;margin:22px 0 18px}
.btn{display:inline-block;padding:12px 20px;border-radius:999px;font-weight:700;text-decoration:none;
  font-size:.95rem;border:1.5px solid transparent;cursor:pointer}
.btn-primary{background:var(--green);color:#fff}
.btn-primary:hover{background:var(--green-700);color:#fff}
.btn-ghost{border-color:var(--green);color:var(--green);background:#fff}
.btn-ghost:hover{background:var(--green-050)}
.pill-strip{display:flex;gap:8px;flex-wrap:wrap;list-style:none;padding:0;margin:6px 0 0}
.pill-strip li{font-size:.8rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;
  color:var(--green);background:#fff;border:1px solid var(--line);padding:6px 12px;border-radius:999px}
.hero-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:22px;box-shadow:var(--shadow)}
.card-title{font-size:.82rem;text-transform:uppercase;letter-spacing:.1em;color:var(--muted);margin-bottom:14px}
.facts{margin:0;display:grid;gap:12px}
.facts div{border-top:1px solid var(--line);padding-top:10px}
.facts dt{font-size:.74rem;text-transform:uppercase;letter-spacing:.08em;color:var(--green);font-weight:700}
.facts dd{margin:2px 0 0;font-size:.95rem}

/* Sections */
.section{padding:64px 0}
/* paper-coloured sections stay transparent so the fixed watermark reads through */
.problem{background:transparent}
.approach{background:var(--card);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.technology{background:transparent}
.applications{background:var(--card);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.about{background:transparent}
.contact{background:var(--green);color:#fff}
.contact .eyebrow{color:#BEE3CE}
.contact .section-lead{color:#DCEDE3}
.contact h2{color:#fff}
.contact a{color:#fff}

.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:26px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;
  box-shadow:var(--shadow)}
.card h3{color:var(--green)}
.card p{margin:0;color:#39424B}

/* Pillars */
.pillars{list-style:none;padding:0;margin:26px 0 0;display:grid;grid-template-columns:repeat(2,1fr);gap:18px;
  counter-reset:p}
.pillars li{background:var(--green-050);border:1px solid var(--line);border-radius:var(--radius);padding:22px;
  position:relative}
.pillar-num{font-weight:800;font-size:.85rem;color:var(--gold);letter-spacing:.1em}
.pillars h3{margin:.35rem 0 .4rem}
.pillars p{margin:0;color:#39424B}

/* Technology */
.tech-grid{display:grid;grid-template-columns:1fr 1fr;gap:38px;align-items:start}
.tech-list{display:grid;gap:14px}
.tech-item{background:var(--card);border:1px solid var(--line);border-left:4px solid var(--green);
  border-radius:10px;padding:16px 18px}
.tech-item h3{margin:0 0 .25rem}
.tech-item p{margin:0;color:#4A545E;font-size:.94rem}

.application-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:24px}
.application-tags span{background:var(--green-050);color:var(--green);font-weight:600;font-size:.85rem;
  border:1px solid var(--line);padding:8px 14px;border-radius:999px}

/* About */
.about-grid{display:grid;grid-template-columns:1.4fr 1fr;gap:38px;align-items:start}
.about-facts{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;
  box-shadow:var(--shadow)}
.ticks{list-style:none;padding:0;margin:0;display:grid;gap:12px}
.ticks li{position:relative;padding-left:26px;font-size:.95rem}
.ticks li::before{content:"";position:absolute;left:0;top:.55em;width:10px;height:10px;border-radius:3px;
  background:var(--green)}

/* Contact */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:38px;align-items:start}
.contact-list{list-style:none;padding:0;margin:20px 0 0;display:grid;gap:12px}
.contact-list li{display:grid;gap:2px;border-top:1px solid rgba(255,255,255,.25);padding-top:10px}
.contact-list span{font-size:.74rem;text-transform:uppercase;letter-spacing:.1em;color:#BEE3CE;font-weight:700}
.contact-form{background:#fff;color:var(--ink);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow)}
.contact-form label{display:grid;gap:6px;font-size:.88rem;font-weight:600;margin-bottom:14px}
.contact-form input,.contact-form textarea{font:inherit;padding:10px 12px;border:1px solid var(--line);
  border-radius:9px;background:#fff;color:var(--ink)}
.contact-form input:focus,.contact-form textarea:focus{outline:2px solid var(--green);outline-offset:1px}
.contact-form .fineprint{color:var(--muted);margin:.7rem 0 0}
/* Inline submit feedback (progressive enhancement — see index.html) */
.contact-form .form-status{margin:.8rem 0 0;font-size:.9rem;font-weight:600;color:var(--muted)}
.contact-form .form-status:empty{display:none}
.contact-form .form-status[data-state="ok"]{color:var(--green)}
.contact-form .form-status[data-state="error"]{color:#B4531E}
.contact-form[aria-busy="true"]{opacity:.75;cursor:progress}
.contact-form[aria-busy="true"] button[type=submit]{pointer-events:none}
/* Honeypot — off-screen, never focusable, invisible to humans */
.hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden;opacity:0}

/* Footer */
.site-footer{background:#0A2E1F;color:#D6E4DB;padding:40px 0;margin-top:0}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1.2fr;gap:28px;align-items:start}
.footer-brand{font-size:1rem;margin:0 0 .4rem;color:#fff}
.site-footer a{color:#D6E4DB;text-decoration:none}
.site-footer a:hover{color:#fff;text-decoration:underline}
.site-footer nav{display:grid;gap:8px}
.site-footer .fineprint{color:#9FB6A8}

/* Responsive */
@media(max-width:900px){
  .hero-grid,.tech-grid,.about-grid,.contact-grid{grid-template-columns:1fr;gap:26px}
  .cards,.pillars{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr;gap:20px}
  .section{padding:48px 0}
}
@media(max-width:560px){
  .header-inner{flex-wrap:wrap;gap:8px;padding-top:10px;padding-bottom:10px}
  .nav{gap:12px}
  .nav a{font-size:.86rem}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}