/* ============================================================================
   QRcodeUniverse — Editorial design system (v2)
   One cacheable stylesheet shared across every page.
   Direction: "quiet luxury" — near-black deep-navy ground, soft off-white ink,
   muted blue-gray secondaries and a single restrained cyan accent. Editorial
   Fraunces (serif display) over Inter (UI). Calm bordered panels, hairline
   translucent borders, minimal shadow. Light + dark via [data-theme] (dark-first).
   ========================================================================== */

@import url("https://fonts.googleapis.com/css2?family=Fraunces:ital,opsz,wght@0,9..144,400;0,9..144,500;0,9..144,600;1,9..144,400;1,9..144,500&family=Inter:wght@400;500;600;700&display=swap");

/* ---------- Design tokens ---------- */
:root{
  /* Accent — single cyan. */
  --accent:#4cc9f0;
  --accent-2:#7ad6f4;
  --accent-strong:#38b6de;
  --accent-ink:#4cc9f0;        /* links / key values on dark            */
  --accent-contrast:#03040a;   /* ink that sits on the cyan fill        */
  --accent-soft:rgba(76,201,240,.10);

  /* Ink — soft off-white → muted blue-grays */
  --ink:#eef2f8;
  --ink-2:#c9d3e2;
  --muted:#98a6bd;
  --faint:#5f6c82;

  /* Ground — near-black deep navy */
  --bg:#03040a;
  --bg-soft:#070b16;
  --bg-tint:rgba(76,201,240,.08);
  --card:rgba(255,255,255,.022);   /* translucent panel fill            */
  --card-2:rgba(255,255,255,.035);
  --canvas:#0b1120;                /* solid inner surfaces              */

  /* Hairlines — translucent */
  --line:rgba(255,255,255,.06);
  --line-soft:rgba(255,255,255,.04);
  --line-strong:rgba(255,255,255,.11);

  --glass:rgba(4,6,13,.72);
  --glass-line:rgba(255,255,255,.06);

  /* Elevation — very soft or none */
  --shadow-xs:none;
  --shadow-sm:0 1px 0 rgba(255,255,255,.02);
  --shadow-md:0 30px 70px -55px rgba(0,0,0,.9);
  --shadow-lg:0 40px 90px -60px rgba(0,0,0,.95);
  --ring:rgba(76,201,240,.26);

  /* Geometry */
  --radius:12px; --radius-lg:14px; --radius-xl:16px;
  --wrap:1120px;

  --sp-1:4px; --sp-2:8px; --sp-3:12px; --sp-4:16px; --sp-5:24px;
  --sp-6:32px; --sp-7:48px; --sp-8:64px; --sp-9:96px; --sp-10:128px;

  /* Type */
  --font-sans:"Inter",system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --font-serif:"Fraunces",Georgia,"Times New Roman",serif;
}

:root[data-theme="light"]{
  --accent:#1183ad;
  --accent-2:#4cc9f0;
  --accent-strong:#0e6d90;
  --accent-ink:#0e7397;
  --accent-contrast:#ffffff;
  --accent-soft:rgba(17,131,173,.08);

  --ink:#12151d;
  --ink-2:#333b48;
  --muted:#5a6472;
  --faint:#8a94a3;

  --bg:#f5f5f1;
  --bg-soft:#fbfbf9;
  --bg-tint:rgba(17,131,173,.08);
  --card:rgba(255,255,255,.66);
  --card-2:rgba(255,255,255,.9);
  --canvas:#ffffff;

  --line:rgba(12,18,30,.09);
  --line-soft:rgba(12,18,30,.06);
  --line-strong:rgba(12,18,30,.14);

  --glass:rgba(245,245,241,.78);
  --glass-line:rgba(12,18,30,.08);

  --shadow-xs:none;
  --shadow-sm:0 1px 2px rgba(20,30,50,.04);
  --shadow-md:0 24px 50px -34px rgba(20,30,50,.28);
  --shadow-lg:0 40px 80px -50px rgba(20,30,50,.34);
  --ring:rgba(17,131,173,.24);
}

/* ---------- Base / reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;font-family:var(--font-sans);color:var(--ink);background:var(--bg);
  line-height:1.65;font-size:16px;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  transition:background .4s ease,color .4s ease;
}
img,svg{max-width:100%;display:block}
a{color:var(--accent-ink);text-decoration:none;transition:color .18s ease,opacity .18s ease}
a:hover{opacity:.82}

/* Editorial serif display; Inter for h3/h4 sub-heads */
h1,h2{font-family:var(--font-serif);line-height:1.08;letter-spacing:-.012em;margin:0 0 .5em;font-weight:500;color:var(--ink);text-wrap:balance}
h1{font-size:clamp(2.6rem,6vw,4.4rem);letter-spacing:-.02em}
h2{font-size:clamp(1.9rem,3.6vw,2.9rem)}
h3{font-family:var(--font-sans);font-size:1.12rem;font-weight:600;letter-spacing:-.01em;line-height:1.3;margin:0 0 .5em;color:var(--ink);text-wrap:balance}
h4{font-family:var(--font-sans);font-size:.98rem;font-weight:600;margin:0 0 .5em;color:var(--ink)}
p{margin:0 0 1.05em;text-wrap:pretty;color:var(--muted)}
strong{font-weight:600;color:var(--ink-2)}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:8px}
::selection{background:rgba(76,201,240,.22)}
.tnum{font-variant-numeric:tabular-nums}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 26px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.skip{position:absolute;left:-999px;top:0;background:var(--ink);color:var(--bg);padding:10px 16px;border-radius:0 0 10px 0;z-index:200;font-weight:600}
.skip:focus{left:0}

/* ---------- Header ---------- */
.site-header{position:sticky;top:0;z-index:100;background:var(--glass);backdrop-filter:saturate(140%) blur(18px);-webkit-backdrop-filter:saturate(140%) blur(18px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;gap:14px;height:68px}
.brand{display:flex;align-items:center;gap:11px;font-family:var(--font-serif);font-weight:500;font-size:1.3rem;color:var(--ink);letter-spacing:-.01em}
.brand:hover{opacity:1}
.brand-mark{width:28px;height:28px;border-radius:8px;flex:0 0 auto}
.nav-links{display:flex;gap:4px;margin-left:auto;align-items:center}
.nav-links a{padding:8px 15px;border-radius:999px;color:var(--muted);font-weight:500;font-size:.92rem}
.nav-links a:hover{background:var(--card-2);color:var(--ink);opacity:1}
.nav-links a[aria-current="page"]{color:var(--ink);background:var(--accent-soft)}
.nav-links a.cta{color:var(--accent);border:1px solid var(--line-strong);margin-left:6px}
.nav-links a.cta:hover{background:var(--accent-soft);border-color:var(--accent);color:var(--accent);opacity:1}
.theme-toggle{margin-left:8px;width:40px;height:40px;border-radius:999px;border:1px solid var(--line-strong);background:transparent;color:var(--ink);cursor:pointer;display:flex;align-items:center;justify-content:center;flex:0 0 auto;transition:background .2s,border-color .2s}
.theme-toggle:hover{background:var(--accent-soft);border-color:var(--accent)}
.theme-toggle svg{width:18px;height:18px}
.theme-toggle .icon-moon{display:none}
:root[data-theme="dark"] .theme-toggle .icon-sun{display:none}
:root[data-theme="dark"] .theme-toggle .icon-moon{display:block}
.nav-toggle{display:none;background:transparent;border:1px solid var(--line-strong);border-radius:10px;width:40px;height:40px;cursor:pointer;font-size:18px;align-items:center;justify-content:center;color:var(--ink)}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  padding:13px 24px;border-radius:999px;font-family:var(--font-sans);font-weight:500;font-size:.98rem;
  letter-spacing:-.005em;cursor:pointer;border:1px solid transparent;line-height:1;
  transition:background .2s ease,border-color .2s ease,color .2s ease,opacity .2s ease;
}
.btn:hover{text-decoration:none}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.45;cursor:not-allowed}
.btn-primary{background:var(--accent);color:var(--accent-contrast);font-weight:600}
.btn-primary:hover{opacity:.9}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--line-strong)}
.btn-ghost:hover{border-color:var(--accent);color:var(--accent)}
.btn-lg{padding:15px 30px;font-size:1.02rem}

/* ---------- Sections ---------- */
section{padding:72px 0}
.eyebrow{display:inline-block;font-family:var(--font-sans);font-size:.72rem;font-weight:600;letter-spacing:.16em;text-transform:uppercase;color:var(--faint);margin-bottom:16px}
.lead{font-size:1.12rem;color:var(--muted);max-width:62ch;line-height:1.6}
.center{text-align:center}
.center .lead{margin-left:auto;margin-right:auto}
.section-soft,.soft{background:var(--bg-soft);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}

/* ---------- Hero ---------- */
.hero{position:relative;padding:80px 0 48px}
.hero .wrap{position:relative}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:52px;align-items:center}
.hero h1{font-weight:500}
.hero h1 span.grad{font-style:italic;color:var(--accent-ink)}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap;margin-top:34px}
.hero-trust{display:flex;gap:10px;flex-wrap:wrap;margin-top:30px}
.chip{display:inline-flex;align-items:center;gap:8px;font-size:.85rem;font-weight:500;color:var(--ink-2);background:var(--card);border:1px solid var(--line);padding:8px 14px;border-radius:999px}
.chip .dot{width:7px;height:7px;border-radius:50%;background:var(--accent)}
.hero-art{position:relative;background:var(--card);border:1px solid var(--line);border-radius:var(--radius-xl);padding:30px;display:flex;align-items:center;justify-content:center;aspect-ratio:1/1;background-image:radial-gradient(color-mix(in srgb,var(--ink) 8%,transparent) 1.1px,transparent 1.1px);background-size:19px 19px}
.hero-art .float{animation:floaty 7s ease-in-out infinite}

/* ---------- Trust band / stat row ---------- */
.trust-band{border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:var(--bg-soft)}
.trust-band .wrap{padding-top:0;padding-bottom:0}
.badge-row{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border-left:1px solid var(--line);border-right:1px solid var(--line)}
.badge{display:flex;flex-direction:column;gap:6px;padding:26px 24px;border-right:1px solid var(--line)}
.badge:last-child{border-right:none}
.badge .k{font-family:var(--font-serif);font-size:1.9rem;font-weight:500;letter-spacing:-.02em;color:var(--ink);font-variant-numeric:tabular-nums;line-height:1}
.badge .l{font-size:.86rem;color:var(--muted);font-weight:400}

/* ---------- Cards / grids ---------- */
.grid{display:grid;gap:18px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-2{grid-template-columns:repeat(2,1fr)}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px 24px;transition:border-color .22s ease,background .22s ease}
.card:hover{border-color:var(--line-strong);background:var(--card-2)}
.card h3{margin-bottom:.45em}
.card p{color:var(--muted);margin:0;font-size:.94rem;line-height:1.6}
.card-icon{width:40px;height:40px;border-radius:10px;background:transparent;display:flex;align-items:center;justify-content:center;margin-bottom:18px;color:var(--accent);border:1px solid var(--line-strong)}
.card-icon svg{width:20px;height:20px}

/* ---------- QR type grid ---------- */
.type-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.type{display:flex;align-items:center;gap:12px;padding:15px 16px;border:1px solid var(--line);border-radius:11px;background:var(--card);transition:border-color .18s ease,background .18s ease}
.type:hover{border-color:var(--accent);background:var(--accent-soft);text-decoration:none}
.type .ti{width:22px;height:22px;display:flex;align-items:center;justify-content:center;color:var(--accent);flex:0 0 auto}
.type .ti svg{width:22px;height:22px}
.type .tn{font-weight:500;font-size:.92rem;color:var(--ink-2)}
.type:hover .tn{color:var(--ink)}

/* ---------- Steps ---------- */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.step{padding-top:22px;border-top:1px solid var(--line-strong)}
.step .num{font-family:var(--font-serif);font-size:1.5rem;font-weight:500;color:var(--accent);margin-bottom:14px;font-variant-numeric:tabular-nums}
.step h3{margin-bottom:.4em}
.step p{color:var(--muted);margin:0;font-size:.94rem}

/* ---------- Pricing ---------- */
.pricing{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;max-width:820px;margin:44px auto 0}
.price-card{position:relative;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:34px;display:flex;flex-direction:column}
.price-card.featured{border-color:var(--accent);background:var(--card-2)}
.price-tag{position:absolute;top:20px;right:22px;font-size:.68rem;font-weight:600;letter-spacing:.1em;text-transform:uppercase;color:var(--accent-contrast);background:var(--accent);padding:5px 11px;border-radius:999px}
.price-name{font-weight:600;font-size:1.05rem;margin-bottom:6px;color:var(--ink)}
.price-amount{font-family:var(--font-serif);font-size:2.8rem;font-weight:500;letter-spacing:-.02em;line-height:1;margin:8px 0 4px;color:var(--ink);font-variant-numeric:tabular-nums}
.price-amount small{font-family:var(--font-sans);font-size:1rem;font-weight:500;color:var(--muted)}
.price-list{list-style:none;padding:0;margin:20px 0 26px;display:grid;gap:11px}
.price-list li{display:flex;gap:10px;align-items:flex-start;color:var(--ink-2);font-size:.95rem}
.price-list li::before{content:"✓";color:var(--accent);font-weight:600;flex:0 0 auto}
.price-list li.off{color:var(--faint)}
.price-list li.off::before{content:"–";color:var(--faint)}

/* ---------- FAQ ---------- */
.faq{max-width:760px;margin:0 auto}
.faq details{border-bottom:1px solid var(--line);padding:2px 0;background:transparent}
.faq summary{cursor:pointer;font-weight:500;font-size:1.05rem;padding:18px 40px 18px 2px;list-style:none;position:relative;color:var(--ink)}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:4px;top:15px;font-size:1.35rem;color:var(--faint);font-weight:400;transition:color .2s ease}
.faq summary:hover::after{color:var(--accent)}
.faq details[open] summary::after{content:"−";color:var(--accent)}
.faq details p{color:var(--muted);padding:0 2px 18px;margin:0;max-width:64ch;font-size:.98rem}

/* ---------- CTA band — bordered panel, no gradient ---------- */
.cta-band{position:relative;overflow:hidden;background:var(--card-2);color:var(--ink);border:1px solid var(--line-strong);border-radius:var(--radius-xl);padding:56px 40px;text-align:center}
.cta-band h2{color:var(--ink);position:relative;margin-bottom:.4em}
.cta-band p{color:var(--muted);max-width:52ch;margin-left:auto;margin-right:auto;position:relative}
.cta-band .btn-ghost,.cta-band .btn-primary{background:var(--accent);color:var(--accent-contrast);border-color:transparent;position:relative;font-weight:600}
.cta-band .btn-ghost:hover,.cta-band .btn-primary:hover{opacity:.9;color:var(--accent-contrast)}

/* ---------- Tool embed ---------- */
.tool-embed{width:100%;border:1px solid var(--line-strong);border-radius:var(--radius-lg);overflow:hidden;background:var(--card)}
.tool-embed iframe{width:100%;height:820px;border:0;display:block;background:transparent}

/* ---------- Article / prose ---------- */
.article{max-width:720px;margin:0 auto}
.article p,.article li{color:var(--ink-2);font-size:1.08rem;line-height:1.75}
.article h2{margin-top:1.3em}
.article h3{margin-top:1.2em;font-size:1.2rem}
.article a{color:var(--accent-ink);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px}
.article a.btn{text-decoration:none}
.article a.btn-primary{color:var(--accent-contrast)}
.article a.btn-ghost{color:var(--ink)}
.article a.btn-ghost:hover{color:var(--accent)}
.article ul,.article ol{padding-left:1.3em}
.article li{margin-bottom:.5em}
.meta{color:var(--faint);font-size:.9rem;font-weight:500;margin-bottom:8px}
.prose-hr{border:none;border-top:1px solid var(--line);margin:2.4em 0}

/* ---------- Post list ---------- */
.post-list{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.post-card{display:flex;flex-direction:column;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:var(--card);transition:border-color .22s ease,background .22s ease}
.post-card:hover{border-color:var(--line-strong);background:var(--card-2);text-decoration:none}
.post-thumb{aspect-ratio:16/9;display:flex;align-items:center;justify-content:center;color:var(--accent);font-family:var(--font-serif);font-weight:500;font-size:1.1rem;background:var(--accent-soft);border-bottom:1px solid var(--line);letter-spacing:.01em}
.post-body{padding:20px 22px}
.post-body h3{margin:0 0 8px;color:var(--ink)}
.post-body p{color:var(--muted);font-size:.92rem;margin:0}
.tag{display:inline-block;font-size:.68rem;font-weight:600;letter-spacing:.1em;text-transform:uppercase;color:var(--faint);background:transparent;border:1px solid var(--line-strong);padding:4px 11px;border-radius:999px;margin-bottom:12px}

/* ---------- Forms ---------- */
.form{max-width:620px;margin:0 auto;display:grid;gap:18px}
.field label{display:block;font-weight:500;font-size:.9rem;margin-bottom:7px;color:var(--ink-2)}
.field input,.field textarea,.field select{
  width:100%;padding:13px 15px;border:1px solid var(--line-strong);border-radius:11px;
  font:inherit;font-size:1rem;background:var(--card);color:var(--ink);
  transition:border-color .18s ease,box-shadow .18s ease,background .18s ease;
}
.field input::placeholder,.field textarea::placeholder{color:var(--faint)}
.field input:hover,.field textarea:hover,.field select:hover{border-color:var(--muted)}
.field input:focus,.field textarea:focus,.field select:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 4px var(--ring);background:var(--card-2)}
.field input:disabled,.field textarea:disabled{opacity:.55;cursor:not-allowed;background:var(--bg-soft)}

/* ---------- Footer ---------- */
.site-footer{background:var(--bg-soft);border-top:1px solid var(--line);padding:56px 0 40px;margin-top:0}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:34px;margin-bottom:40px}
.footer-col h4{font-family:var(--font-sans);font-size:.7rem;font-weight:600;text-transform:uppercase;letter-spacing:.12em;color:var(--faint);margin-bottom:14px}
.footer-col a{display:block;color:var(--muted);padding:6px 0;font-size:.92rem;font-weight:400}
.footer-col a:hover{color:var(--ink)}
.site-footer .brand{display:inline-flex;align-items:center;gap:11px;color:var(--ink)}
.site-footer .brand:hover{color:var(--ink);opacity:1}
.footer-about{max-width:34ch;color:var(--muted);font-size:.92rem;margin-top:14px}
.footer-bottom{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;border-top:1px solid var(--line);padding-top:24px;color:var(--faint);font-size:.84rem}

/* ---------- Reveal on scroll ---------- */
.reveal{opacity:0;transform:translateY(16px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}

/* ---------- Animations ---------- */
@keyframes floaty{0%,100%{transform:translateY(0)}50%{transform:translateY(-12px)}}

/* ---------- Utilities ---------- */
.mt-0{margin-top:0}.mb-0{margin-bottom:0}

/* ---------- Responsive ---------- */
@media (max-width:960px){
  .hero-grid{grid-template-columns:1fr;gap:40px}
  .grid-3,.steps,.post-list{grid-template-columns:1fr 1fr}
  .type-grid{grid-template-columns:repeat(3,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
  .badge-row{grid-template-columns:repeat(2,1fr)}
  .badge:nth-child(2){border-right:none}
  .badge:nth-child(1),.badge:nth-child(2){border-bottom:1px solid var(--line)}
  .nav-links{position:fixed;inset:68px 0 auto 0;flex-direction:column;background:var(--glass);backdrop-filter:saturate(140%) blur(18px);-webkit-backdrop-filter:saturate(140%) blur(18px);border-bottom:1px solid var(--line);padding:14px 24px 20px;gap:2px;display:none}
  .nav-links.open{display:flex}
  .nav-links a{padding:13px 12px;width:100%}
  .nav-links a.cta{margin:6px 0 0;text-align:center;justify-content:center}
  .nav-toggle{display:flex;margin-left:auto}
  .theme-toggle{margin-left:0}
}
@media (max-width:600px){
  section{padding:56px 0}
  .wrap{padding:0 20px}
  .grid-3,.grid-2,.steps,.post-list,.type-grid,.pricing{grid-template-columns:1fr}
  .badge-row{grid-template-columns:1fr 1fr}
  .cta-band{padding:44px 24px}
  .hero{padding:56px 0 36px}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-bottom{flex-direction:column;gap:8px}
}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important;scroll-behavior:auto!important}.reveal{opacity:1;transform:none}}