/* ============================================================
   Arthrovia — joint topical relief cream · RIBBON HERO
   Design: Precise, modern, tech-clean but approachable. Cool
   metallic-silver sheen with deep navy-blue structure and a
   fresh green pulse of energy. Geometric hairline grids, crisp
   radius, subtle silver gradient ribbon. Honest and modern —
   NO lab/nanotech gimmicks, just a considered topical formula.
   (Distinct from Artronol's forest/bronze: this one is silver/tech.)
   ============================================================ */
:root{
  --ink:#1d2733;
  --ink2:#162c52;
  --muted:#5a6a7d;
  --accent:#2fd286;        /* fresh green */
  --accent-d:#0c8d5a;
  --blue:#263a6b;          /* deep blue */
  --navy:#101b36;
  --silver:#e9eef3;        /* cool silver */
  --silver-2:#f4f7fa;
  --bg:#f3f6f9;
  --card:#ffffff;
  --line:#d7dfe8;
  --grad:linear-gradient(115deg,#1e3a6e 0%,#2f7fd0 100%);
  --sheen:linear-gradient(135deg,#fff 0%,#e9eef3 40%,#d3dbe4 72%,#eef2f6 100%);
  --r:12px;                /* precise, modest radius */
  --shadow:0 16px 34px -22px rgba(16,27,54,.45);
  --font:'Inter','Segoe UI',system-ui,-apple-system,'Helvetica Neue',Arial,sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--font);color:var(--ink);background:var(--bg);line-height:1.63;-webkit-font-smoothing:antialiased}
img{display:block;max-width:100%}
a{text-decoration:none;color:inherit}
.wrap{max-width:1160px;margin:0 auto;padding:0 22px}
h1,h2,h3{line-height:1.16;letter-spacing:-.015em}

/* ---------- Header ---------- */
.site-header{position:sticky;top:0;z-index:50;background:rgba(16,27,54,.92);backdrop-filter:blur(10px);box-shadow:0 1px 0 rgba(255,255,255,.08)}
.header-in{display:flex;align-items:center;justify-content:space-between;gap:20px;min-height:66px}
.brand{font-weight:800;letter-spacing:.05em;font-size:1.3rem;color:#fff}
.brand b{color:var(--accent)}
.nav{display:flex;align-items:center;gap:24px}
.nav a{color:rgba(255,255,255,.86);font-weight:600;font-size:.92rem}
.nav a:hover{color:#fff}
.cta-btn{display:inline-block;background:var(--grad);color:#fff;font-weight:800;font-size:.95rem;padding:.82rem 1.5rem;border-radius:9px;box-shadow:0 12px 24px -12px rgba(30,58,110,.85);transition:transform .15s ease,box-shadow .15s ease}
.cta-btn:hover{transform:translateY(-2px);box-shadow:0 18px 32px -14px rgba(30,58,110,.95)}
.nav .cta-btn{color:#fff;padding:.58rem 1.1rem}

/* ---------- Hero (RIBBON archetype) — metallic-light ---------- */
.hero{background:linear-gradient(160deg,var(--silver-2) 0%,#e4eaef 38%,#d3dbe4 100%);color:var(--ink);position:relative;overflow:hidden}
/* precise hairline grid */
.hero::before{content:"";position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(rgba(30,58,110,.06) 1px,transparent 1px),linear-gradient(90deg,rgba(30,58,110,.05) 1px,transparent 1px);
  background-size:56px 56px}
.hero::after{content:"";position:absolute;right:-180px;top:-160px;width:520px;height:520px;border-radius:50%;background:radial-gradient(circle,rgba(47,210,134,.18),transparent 62%);pointer-events:none}
.hero-ribbon .wrap{position:relative;z-index:1}
.ribbon-kicker span{background:linear-gradient(135deg,var(--accent),#2fd286);color:#0c2a1c;box-shadow:0 8px 20px -8px rgba(47,210,134,.8)}
.eyebrow{display:inline-block;color:var(--blue);font-weight:700;letter-spacing:.14em;text-transform:uppercase;font-size:.7rem;background:#fff;border:1px solid var(--line);box-shadow:0 6px 16px -10px rgba(16,27,54,.5);padding:.34rem .8rem;border-radius:6px}
.hero h1{font-size:clamp(1.95rem,4.4vw,3.1rem);font-weight:800;color:var(--navy);margin-bottom:16px}
.hero .lead{color:var(--muted);font-size:1.05rem;margin: 0;max-width:50ch}
.hero .hot{color:var(--blue);font-weight:700;font-size:.92rem;margin-top:14px}
.hero-actions{display:flex;gap:16px;flex-wrap:wrap;align-items:center;margin:auto 0 0}
.hero-actions .cta-btn{font-size:1.04rem;padding:.92rem 1.6rem}
.hero-ribbon .trust-row span{color:var(--ink2);font-weight:700;font-size:.9rem}
.hero-ribbon .trust-row svg{width:16px;height:16px;color:var(--accent-d)}
.hero-visual{display:flex;align-items:center;justify-content:center;position:relative}
.hero-visual::before{content:"";position:absolute;width:min(360px,94%);aspect-ratio:1;border-radius:50%;background:radial-gradient(circle,rgba(47,210,134,.26),rgba(38,58,107,.10) 58%,transparent 74%)}
.hero-prod{position:relative;width:min(280px,34vw);height:auto;filter:drop-shadow(0 36px 46px rgba(16,27,54,.32))}

/* ---------- Sections ---------- */
section{padding:64px 22px}
.sec-head{max-width:720px;margin:0 auto 36px;text-align:center}
.kicker{color:var(--accent-d);font-weight:700;letter-spacing:.18em;text-transform:uppercase;font-size:.7rem;margin-bottom:12px}
.sec-head h2{font-size:clamp(1.55rem,2.7vw,2.2rem);color:var(--navy);font-weight:800;margin-bottom:12px}
.sec-head p{color:var(--muted);font-size:1rem}

/* benefits */
.ben-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.ben-card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:26px;box-shadow:var(--shadow);border-top:3px solid var(--accent);transition:transform .16s ease}
.ben-card:hover{transform:translateY(-4px)}
.ben-card .ic{width:48px;height:48px;border-radius:10px;background:linear-gradient(135deg,rgba(38,58,107,.12),rgba(47,210,134,.12));display:grid;place-items:center;margin-bottom:15px}
.ben-card .ic svg{width:24px;height:24px;color:var(--blue)}
.ben-card h3{color:var(--navy);font-size:1.05rem;margin-bottom:8px}
.ben-card p{color:var(--muted);font-size:.93rem}

/* how */
.how-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.step{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:26px;position:relative;box-shadow:var(--shadow)}
.step .num{width:46px;height:46px;border-radius:10px;background:var(--grad);color:#fff;display:grid;place-items:center;font-weight:800;font-size:1.05rem;margin-bottom:14px;box-shadow:0 10px 18px -10px rgba(30,58,110,.75)}
.step h3{color:var(--navy);font-size:1.05rem;margin-bottom:8px}
.step p{color:var(--muted);font-size:.93rem}

/* ingredients */
.ing-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:16px}
.ing-card{background:linear-gradient(180deg,#fff,var(--silver-2));border:1px solid var(--line);border-left:4px solid var(--accent);border-radius:12px;padding:18px;box-shadow:var(--shadow)}
.ing-card h3{color:var(--navy);font-size:.99rem;margin-bottom:6px}
.ing-card p{color:var(--muted);font-size:.89rem}

/* about split */
#about .split{display:grid;grid-template-columns:1fr 1fr;gap:42px;align-items:center;background:linear-gradient(130deg,#101b36,#263a6b);border-radius:16px;padding:44px;color:#fff;box-shadow:0 26px 52px -30px rgba(16,27,54,.7)}
#about .split .kicker{color:var(--accent)}
#about .split h2{color:#fff;font-size:clamp(1.4rem,2.4vw,1.95rem);margin-bottom:12px}
#about .split p.lead{color:#d3dff2;font-size:1rem}
.checklist{list-style:none;margin:0 0 24px}
.checklist li{display:flex;align-items:flex-start;gap:12px;color:#e4edf9;font-weight:600;padding:9px 0;border-bottom:1px solid rgba(255,255,255,.14);font-size:.96rem}
.checklist svg{flex:none;width:20px;height:20px;color:var(--accent);margin-top:3px}

/* quote */
.quote{background:linear-gradient(180deg,var(--silver-2),var(--silver));color:var(--navy);text-align:center}
.quote h2{font-size:clamp(1.5rem,2.7vw,2.15rem);max-width:640px;margin:0 auto 14px}
.quote p{color:var(--muted);max-width:600px;margin:0 auto 24px;font-size:1rem}

/* faq */
.faq-box{max-width:780px;margin:0 auto}
details{background:var(--card);border:1px solid var(--line);border-radius:12px;margin-bottom:12px;box-shadow:0 10px 24px -20px rgba(16,27,54,.5);overflow:hidden}
summary{list-style:none;padding:18px 20px;font-weight:700;color:var(--navy);cursor:pointer;position:relative;padding-right:42px}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";position:absolute;right:20px;top:50%;transform:translateY(-50%);color:var(--accent-d);font-size:1.3rem;font-weight:800}
details[open] summary::after{content:"−"}
details .a{padding:0 20px 18px;color:var(--muted);font-size:.95rem}

/* cta band */
.cta-band{background:linear-gradient(120deg,#101b36,#263a6b);color:#fff;text-align:center}
.cta-band h2{font-size:clamp(1.6rem,3vw,2.3rem);margin-bottom:12px}
.cta-band p{color:#d3dff2;max-width:620px;margin:0 auto 26px}

/* sub pages */
.simple{background:var(--silver-2);padding:60px 22px}
.simple .wrap{max-width:820px}
.simple h1{color:var(--navy);font-size:clamp(1.6rem,3vw,2.2rem);margin-bottom:20px}
.simple p{color:var(--muted);margin-bottom:14px}
.simple .tip{background:#fff;border:1px solid var(--line);border-left:4px solid var(--accent);border-radius:10px;padding:16px 18px;color:var(--navy);font-size:.95rem;margin:18px 0}
.cta-wrapper{text-align:center;margin-top:28px}
.simple .how-grid{margin-top:10px}

/* ---------- Footer ---------- */
.site-footer{background:#0b1524;color:#c7d6ea;padding:52px 22px 30px}
.footer-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:32px;margin-bottom:30px}
.site-footer h4{color:#fff;font-size:.95rem;margin-bottom:12px;text-transform:uppercase;letter-spacing:.06em}
.site-footer p{font-size:.87rem;color:#8ea6c4}
.site-footer ul{list-style:none}
.site-footer li{margin-bottom:8px}
.site-footer a{color:#9db3cf;font-size:.9rem}
.site-footer a:hover{color:var(--accent)}
.footer-bot{border-top:1px solid rgba(255,255,255,.14);padding-top:20px;color:#7c93b1;font-size:.82rem;text-align:center}
.site-footer .ft-buy{display:inline-block;background:var(--accent,#2fd286);color:#0b1524 !important;font-weight:800;padding:9px 18px;border-radius:9px;margin-bottom:6px;box-shadow:0 4px 14px rgba(0,0,0,.3)}
.site-footer .ft-buy:hover{filter:brightness(1.08);color:#0b1524 !important}

/* country switcher */
.lang-block{margin-bottom:30px}
.lang-label{color:#8ea6c4;font-size:.8rem;text-transform:uppercase;letter-spacing:.1em;margin-bottom:12px}
.lang-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:10px}
.lang-link{display:inline-flex;align-items:center;gap:8px;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.15);color:#d3dff2;padding:.5rem .85rem;border-radius:9px;font-size:.86rem;transition:.15s;min-height:60px}
.lang-link:hover{background:rgba(47,210,134,.18);border-color:#3fdc8f}
.lang-link.active{background:var(--accent);color:#0b1524;border-color:var(--accent);font-weight:800}
.lang-link img{display:inline-block;vertical-align:middle;margin-right:6px;border-radius:2px;flex:none}

/* ---------- Interaction states ---------- */
a:focus-visible,summary:focus-visible{outline:3px solid rgba(47,210,134,.6);outline-offset:2px;border-radius:6px}
.cta-btn:focus-visible{outline:3px solid #fff;outline-offset:2px}

/* ---------- Responsive ---------- */
@media (max-width:960px){
  .hero-ribbon .wrap{grid-template-columns:1fr}
}
@media (max-width:720px){
  .hero-ribbon .wrap{grid-template-columns:1fr;padding:44px 18px}
  .hero-visual::before,.hero-visual{margin:0 auto}
  .ben-grid,.how-grid,.ing-grid{grid-template-columns:1fr}
  .split{grid-template-columns:1fr;gap:14px}
  .footer-grid{grid-template-columns:1fr;gap:24px}
  .quote .wrap{text-align:center}
  .quote .cta-btn{justify-self:center}
  .cta-btn{min-height:52px;padding:0 22px}
  .step{text-align:left}
}
@media (max-width:640px){
  .site-header{position:static}
  .header-in{flex-direction:column;gap:10px;padding:12px 16px}
  .nav{flex-wrap:wrap;justify-content:center;row-gap:8px}
  .nav .cta-btn{order:9;width:100%;justify-content:center}
  .lang-list{grid-template-columns:1fr 1fr;gap:8px}
  .sec-head h2{font-size:1.6rem}
  .hero h1{font-size:1.95rem}
  .hero .lead{font-size:1.02rem}
  .hero-prod{max-width:80%;margin:0 auto}
  .footer-bot{flex-direction:column;align-items:center;text-align:center}
}
@media (max-width:460px){
  .ben-grid,.how-grid{grid-template-columns:1fr}
  .lang-link{min-height:54px;font-size:.8rem;padding:6px 10px}
}
@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}