/* TapPass v3 design system — shared across every page on tappass.ai.
   Page-specific component CSS stays inline in each page.
   Tokens, typography, buttons, header/footer, reveal animations live here. */

:root{
  --bg:#FBFCFE;
  --bg-warm:#F0F4FA;
  --paper:#FFFFFF;
  --ink:#0F1612;
  --ink-2:#1D2822;
  --muted:#566170;
  --muted-2:#8A93A0;
  --line:#E4E8EE;
  --line-2:#CBD2DC;
  --brand:#1F6B3A;
  --brand-2:#2E8550;
  --brand-3:#57A879;
  --brand-soft:#E4F0E8;
  --brand-softer:#EFF5EE;
  --amber:#335A8A;
  --amber-soft:#E6EEF8;
  --danger:#B8382B;
  --danger-soft:#F9E0DB;
  --blue:#3663A6;
  --blue-soft:#E3ECF6;
  --shadow-sm:0 1px 2px rgba(15,22,18,.04);
  --shadow-md:0 10px 26px -10px rgba(15,22,18,.12), 0 3px 7px -2px rgba(15,22,18,.05);
  --shadow-lg:0 30px 74px -22px rgba(15,22,18,.22), 0 12px 24px -10px rgba(15,22,18,.08);
  --radius:14px;
  --radius-lg:20px;
  --radius-xl:28px;
  --sans:'Inter',system-ui,sans-serif;
  --mono:'Inter',system-ui,sans-serif;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--ink);font-family:var(--sans);font-size:15px;line-height:1.55;-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:inherit;text-decoration:none}
img,svg{display:block;max-width:100%}

.container{max-width:1180px;margin:0 auto;padding:0 32px}

/* Typography */
h1,h2,h3,h4{font-weight:600;letter-spacing:-0.025em;color:var(--ink)}
h1{font-size:clamp(44px,5.8vw,82px);line-height:1;letter-spacing:-0.04em;font-weight:650}
h2{font-size:clamp(32px,3.8vw,54px);line-height:1.04;letter-spacing:-0.032em;font-weight:600}
h3{font-size:22px;line-height:1.3;font-weight:600;letter-spacing:-0.02em}
h4{font-size:15px;font-weight:600}
p{color:var(--muted);line-height:1.6;font-size:15px}

.lede{font-size:18px;color:var(--muted);line-height:1.55;max-width:58ch}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-family:var(--mono);font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--brand);padding:6px 12px;border:1px solid var(--brand-soft);background:var(--brand-softer);border-radius:999px;font-weight:500}
.eyebrow::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--brand)}
.section-tag{font-family:var(--mono);font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--brand);font-weight:500;margin-bottom:14px;display:inline-block}

/* Buttons */
.btn{display:inline-flex;align-items:center;gap:8px;font-size:14px;font-weight:500;padding:11px 20px;border-radius:999px;border:1px solid transparent;cursor:pointer;transition:all .15s ease;line-height:1;white-space:nowrap}
.btn-primary{background:var(--ink);color:#fff;border-color:var(--ink)}
.btn-primary:hover{background:var(--brand);border-color:var(--brand);transform:translateY(-1px);box-shadow:var(--shadow-md)}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--line-2)}
.btn-ghost:hover{background:var(--bg-warm);border-color:var(--ink)}
.btn-lg{padding:14px 26px;font-size:15px}
.btn svg{width:14px;height:14px}

/* Scroll-triggered reveal, enters only when in view */
.reveal{opacity:0;transform:translateY(28px);transition:opacity .85s cubic-bezier(.22,1,.36,1), transform .85s cubic-bezier(.22,1,.36,1);will-change:opacity,transform}
.reveal.in{opacity:1;transform:none}
.reveal.d1{transition-delay:.08s}
.reveal.d2{transition-delay:.18s}
.reveal.d3{transition-delay:.28s}
.reveal.d4{transition-delay:.38s}
@media (prefers-reduced-motion: reduce){
  .reveal{opacity:1;transform:none;transition:none}
}

/* Scroll progress bar (top-of-page indicator) */
.scroll-progress{position:fixed;top:0;left:0;height:2px;width:0%;background:linear-gradient(90deg,var(--brand-3),var(--brand));z-index:100;transition:width .08s linear;pointer-events:none}

/* Top navigation */
header.topbar{position:sticky;top:0;z-index:50;background:rgba(251,252,254,.82);backdrop-filter:saturate(1.2) blur(14px);border-bottom:1px solid transparent;transition:border-color .2s,background .2s}

/* Mobile hamburger menu (shared primitives) */
.ham-btn{display:none;background:none;border:1px solid var(--line-2);border-radius:10px;padding:7px;cursor:pointer;color:var(--ink);align-items:center;justify-content:center;transition:border-color .15s}
.ham-btn:hover{border-color:var(--ink)}
.ham-btn svg{width:18px;height:18px}
.mob-menu{display:none;position:fixed;top:60px;left:0;right:0;bottom:0;background:rgba(251,252,254,.98);backdrop-filter:saturate(1.2) blur(20px);z-index:49;padding:32px 24px 40px;flex-direction:column;gap:4px;overflow-y:auto}
.mob-menu.open{display:flex}
.mob-menu a{display:flex;align-items:center;padding:14px 16px;border-radius:12px;font-size:16px;font-weight:500;color:var(--ink);letter-spacing:-0.01em}
.mob-menu a:hover{background:var(--bg-warm)}
.mob-menu .mob-sep{height:1px;background:var(--line);margin:8px 0}
.mob-menu .mob-cta{margin-top:18px;display:flex;flex-direction:column;gap:10px}
.mob-menu .mob-cta .btn{width:100%;justify-content:center;padding:14px 20px}
body.mob-open{overflow:hidden}
header.topbar.scrolled{border-bottom-color:var(--line);background:rgba(251,252,254,.96)}
.nav{max-width:1180px;margin:0 auto;padding:14px 32px;display:flex;align-items:center;gap:40px}
.brand{display:flex;align-items:center;gap:10px}
.brand-word{font-size:18px;font-weight:700;letter-spacing:-0.025em}
.nav-links{display:flex;gap:28px;font-size:14px;color:var(--muted);font-weight:500}
.nav-links a:hover{color:var(--ink)}
.nav-end{margin-left:auto;display:flex;align-items:center;gap:14px}
.nav-end .signin{font-size:14px;color:var(--muted);font-weight:500}
.news-pill{display:inline-flex;align-items:center;gap:8px;font-family:var(--mono);font-size:11px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);padding:6px 12px 6px 8px;border:1px solid var(--line);background:#fff;border-radius:999px;font-weight:500}
.news-pill b{background:var(--ink);color:#fff;padding:3px 8px;border-radius:999px;font-family:var(--sans);font-size:10px;letter-spacing:.04em}

/* Footer */
footer.site-foot{padding:72px 0 36px;border-top:1px solid var(--line);background:var(--bg-warm)}
.foot-grid{display:grid;grid-template-columns:1.4fr repeat(4,1fr);gap:40px;padding-bottom:44px}
.foot-grid h4{font-size:11px;color:var(--muted-2);font-weight:500;letter-spacing:.1em;text-transform:uppercase;font-family:var(--mono);margin-bottom:14px}
.foot-grid ul{list-style:none}
.foot-grid li{padding:5px 0;font-size:13.5px;color:var(--muted)}
.foot-grid li a:hover{color:var(--ink)}
.foot-brand .addr{color:var(--muted);font-size:13px;margin-top:14px;line-height:1.55;max-width:30ch}
.foot-social{display:flex;align-items:center;gap:10px;margin-top:18px}
.foot-social a{display:inline-flex;align-items:center;gap:6px;padding:7px 10px;border:1px solid var(--line);border-radius:999px;color:var(--muted);background:#fff;transition:color .15s,border-color .15s,background .15s}
.foot-social a:hover{color:var(--ink);border-color:var(--ink)}
.foot-social a svg{display:block}
.foot-social a.fs-status{font-family:var(--mono);font-size:11px;letter-spacing:.04em;font-weight:500;padding:7px 12px 7px 10px}
.foot-social a.fs-status .fs-dot{width:7px;height:7px;border-radius:50%;background:#2E8550;box-shadow:0 0 0 3px rgba(46,133,80,.18)}
.foot-social a.fs-status:hover .fs-dot{background:#1F6B3A}
.foot-bottom{padding-top:26px;border-top:1px solid var(--line);display:flex;justify-content:space-between;font-size:12px;color:var(--muted-2)}
.foot-bottom a{margin-left:16px}
.foot-bottom a:hover{color:var(--ink)}

/* ======= Blog index ======= */
section.blog-hero{padding:80px 0 24px;position:relative;overflow:hidden;text-align:center}
section.blog-hero::before{content:"";position:absolute;left:50%;top:-120px;transform:translateX(-50%);width:1100px;height:520px;background:radial-gradient(closest-side,rgba(31,107,58,.12),transparent 70%);filter:blur(24px);pointer-events:none;z-index:0}
.blog-hero .container{position:relative;z-index:1}
.blog-hero h1{font-size:clamp(40px,5.4vw,68px);font-weight:650;letter-spacing:-0.03em;margin:14px auto 16px;max-width:14ch}
.blog-hero p{max-width:600px;margin:0 auto;font-size:17px}

.blog-tags{display:flex;flex-wrap:wrap;gap:6px;justify-content:center;padding:24px 0 40px;max-width:920px;margin:0 auto}
.blog-tag{font-family:var(--mono);font-size:11.5px;letter-spacing:.04em;color:var(--muted);background:#fff;border:1px solid var(--line);padding:8px 14px;border-radius:999px;cursor:pointer;font-weight:500;transition:color .15s,border-color .15s,background .15s}
.blog-tag:hover{color:var(--ink);border-color:var(--ink)}
.blog-tag.on{background:var(--ink);color:#fff;border-color:var(--ink)}

.blog-featured{max-width:1080px;margin:0 auto 32px;padding:0 32px}
.featured{display:grid;grid-template-columns:1.15fr 1fr;gap:28px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:var(--radius-xl);padding:28px;box-shadow:var(--shadow-sm);transition:transform .2s,box-shadow .2s,border-color .2s}
.featured:hover{transform:translateY(-2px);box-shadow:var(--shadow-md);border-color:var(--line-2)}
.featured img.og-img{width:100%;aspect-ratio:16/9;object-fit:cover;border-radius:var(--radius-lg);background:var(--bg-warm)}
.featured-body{padding:4px 8px}
.featured-label{font-family:var(--mono);font-size:10.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--brand);font-weight:600;display:inline-block;margin-bottom:12px}
.featured-body h2{font-size:clamp(22px,2.6vw,30px);font-weight:650;letter-spacing:-0.022em;line-height:1.2;margin:10px 0 12px;color:var(--ink)}
.featured-body p{font-size:15px;line-height:1.6;margin-bottom:14px}
.featured-body .meta{font-family:var(--mono);font-size:11.5px;color:var(--muted);letter-spacing:.02em}
.featured-body .meta .meta-dot{display:inline-block;width:3px;height:3px;border-radius:50%;background:var(--line-2);margin:0 8px;vertical-align:middle}

.blog-grid{max-width:1140px;margin:0 auto;padding:0 32px 96px;display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.post-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);overflow:hidden;display:flex;flex-direction:column;transition:transform .2s,box-shadow .2s,border-color .2s}
.post-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-md);border-color:var(--line-2)}
.post-card .card-accent{height:3px}
.post-card .card-body{padding:22px 22px 20px;display:flex;flex-direction:column;flex:1}
.post-card .card-top{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:14px}
.card-tags{display:flex;gap:6px;flex-wrap:wrap}
.card-tag{font-family:var(--mono);font-size:10px;letter-spacing:.06em;text-transform:uppercase;padding:3px 8px;border-radius:5px;font-weight:600}
.card-tag.t-red{background:rgba(184,56,43,.09);color:var(--danger)}
.card-tag.t-blue{background:var(--blue-soft);color:var(--blue)}
.card-tag.t-green{background:var(--brand-soft);color:var(--brand)}
.card-tag.t-amber{background:var(--amber-soft);color:var(--amber)}
.card-tag.t-violet{background:rgba(139,92,246,.08);color:#7c3aed}
.card-read{font-family:var(--mono);font-size:10.5px;color:var(--muted-2);letter-spacing:.02em;white-space:nowrap}
.post-card h2{font-size:18px;font-weight:650;letter-spacing:-0.014em;line-height:1.28;margin-bottom:10px;color:var(--ink)}
.post-card p{font-size:14px;line-height:1.55;margin-bottom:14px;color:var(--muted);flex:1}
.post-card .meta{font-family:var(--mono);font-size:11px;color:var(--muted);letter-spacing:.02em;display:block;margin-bottom:12px}
.post-card .meta .meta-dot{display:inline-block;width:3px;height:3px;border-radius:50%;background:var(--line-2);margin:0 6px;vertical-align:middle}
.post-card .card-arrow{display:inline-flex;align-items:center;gap:6px;font-family:var(--mono);font-size:11.5px;color:var(--brand);font-weight:600;letter-spacing:.02em;margin-top:auto;padding-top:4px}
.post-card .card-arrow svg{width:14px;height:14px}
.post-card.hide{display:none}

@media (max-width:980px){
  .blog-grid{grid-template-columns:1fr 1fr}
  .featured{grid-template-columns:1fr;gap:20px;padding:22px}
}
@media (max-width:640px){
  .blog-grid{grid-template-columns:1fr;padding:0 20px 72px}
  .blog-featured{padding:0 20px}
  .blog-hero{padding:56px 0 16px}
  .blog-hero h1{font-size:clamp(32px,8vw,44px)}
}

/* ======= Blog article ======= */
section.article-hero{padding:64px 0 28px;position:relative;overflow:hidden}
section.article-hero::before{content:"";position:absolute;left:50%;top:-120px;transform:translateX(-50%);width:900px;height:460px;background:radial-gradient(closest-side,rgba(31,107,58,.1),transparent 70%);filter:blur(24px);pointer-events:none;z-index:0}
.article-hero .container{position:relative;z-index:1;max-width:760px}
.article-hero .eyebrow{background:var(--brand-softer);border:1px solid var(--brand-soft);color:var(--brand);display:inline-flex;align-items:center;padding:5px 11px;font-family:var(--mono);font-size:11px;letter-spacing:.08em;text-transform:uppercase;font-weight:600;border-radius:999px}
.article-hero h1{font-size:clamp(30px,4.4vw,48px);line-height:1.14;font-weight:650;letter-spacing:-0.028em;margin:18px 0 22px;color:var(--ink)}
.article-hero .article-meta{font-family:var(--mono);font-size:12px;color:var(--muted);display:flex;flex-wrap:wrap;gap:6px;align-items:center;letter-spacing:.02em;margin-bottom:22px}
.article-hero .article-meta .sep{color:var(--line-2)}
.article-hero .author-card{display:inline-flex;align-items:center;gap:12px;padding:10px 14px 10px 10px;background:#fff;border:1px solid var(--line);border-radius:999px}
.article-hero .author-card img{width:32px;height:32px;border-radius:50%;object-fit:cover;box-shadow:inset 0 0 0 1px rgba(15,22,18,.1)}
.article-hero .author-card .author-info{display:flex;flex-direction:column;gap:0}
.article-hero .author-card .author-name{font-size:13px;font-weight:650;color:var(--ink);line-height:1.2}
.article-hero .author-card .author-role{font-size:11.5px;color:var(--muted);font-family:var(--mono);letter-spacing:.02em}

article.article-body{max-width:720px;margin:0 auto;padding:8px 32px 64px}
article.article-body p{font-size:16.5px;line-height:1.78;color:var(--ink-2);margin-bottom:18px}
article.article-body p.lead{font-size:19px;font-weight:500;color:var(--ink);line-height:1.65;margin-bottom:28px}
article.article-body h2{font-size:clamp(22px,2.4vw,28px);font-weight:650;letter-spacing:-0.022em;line-height:1.22;margin:48px 0 14px;color:var(--ink)}
article.article-body h3{font-size:18px;font-weight:650;letter-spacing:-0.015em;margin:32px 0 10px;color:var(--ink)}
article.article-body ul,article.article-body ol{margin:0 0 18px 22px;color:var(--ink-2)}
article.article-body li{margin-bottom:8px;font-size:16px;line-height:1.72}
article.article-body strong{color:var(--ink);font-weight:650}
article.article-body blockquote{border-left:3px solid var(--brand);padding:16px 24px;margin:28px 0;background:var(--brand-softer);border-radius:0 14px 14px 0;font-style:italic;color:var(--ink);font-size:16.5px;line-height:1.6}
article.article-body code{font-family:'JetBrains Mono','SF Mono',ui-monospace,monospace;font-size:14px;background:var(--bg-warm);border:1px solid var(--line);padding:1px 6px;border-radius:5px;color:var(--ink)}
article.article-body pre{font-family:'JetBrains Mono','SF Mono',ui-monospace,monospace;font-size:13px;line-height:1.7;background:#0F1612;color:rgba(255,255,255,.85);padding:18px 20px;border-radius:var(--radius-lg);overflow-x:auto;margin:24px 0;border:1px solid #1B2822}
article.article-body pre code{background:transparent;border:none;padding:0;color:inherit;font-size:inherit}
article.article-body hr.divider,article.article-body hr{border:none;border-top:1px solid var(--line);margin:48px 0}
article.article-body a{color:var(--brand);font-weight:500;border-bottom:1px solid var(--brand-soft)}
article.article-body a:hover{border-color:var(--brand)}
article.article-body table{width:100%;border-collapse:collapse;font-size:14px;margin:24px 0}
article.article-body table th,article.article-body table td{padding:12px 16px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
article.article-body table th{font-family:var(--mono);font-size:11px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);background:var(--bg-warm);font-weight:600}

.article-cta{max-width:720px;margin:48px auto 0;padding:32px 28px;background:linear-gradient(135deg,var(--brand-softer),var(--brand-soft));border:1px solid var(--brand-soft);border-radius:var(--radius-xl);text-align:center}
.article-cta h3{font-size:20px;font-weight:650;margin-bottom:8px;color:var(--ink);letter-spacing:-0.018em}
.article-cta p{font-size:15px;margin-bottom:20px;color:var(--ink-2)}
.article-cta .cta-btns{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}

@media (max-width:640px){
  article.article-body{padding:8px 20px 48px}
  article.article-body p,article.article-body li{font-size:15.5px}
  .article-hero{padding:44px 0 20px}
  .article-hero h1{font-size:clamp(26px,7vw,34px)}
  .article-cta{margin:32px 16px 0;padding:26px 22px}
}

/* Article / long-form content shell (privacy, terms, imprint) */
.doc-page{padding:64px 0 96px;max-width:780px;margin:0 auto}
.doc-page h1{font-size:clamp(36px,4vw,52px);margin-bottom:24px}
.doc-page h2{font-size:clamp(22px,2.2vw,28px);margin-top:48px;margin-bottom:14px;letter-spacing:-0.02em}
.doc-page h3{font-size:17px;margin-top:28px;margin-bottom:8px}
.doc-page p{font-size:15.5px;color:var(--ink-2);line-height:1.7;margin-bottom:14px}
.doc-page ul,.doc-page ol{margin:0 0 14px 24px;color:var(--ink-2);font-size:15.5px;line-height:1.7}
.doc-page li{margin-bottom:6px}
.doc-page a{color:var(--brand);border-bottom:1px solid var(--brand-soft);transition:border-color .15s}
.doc-page a:hover{border-color:var(--brand)}
.doc-page .updated{font-family:var(--mono);font-size:12px;color:var(--muted);letter-spacing:.02em;margin-bottom:36px}

@media (max-width:980px){
  .nav-links{display:none}
  .ham-btn{display:inline-flex}
  .nav-end .signin{display:none}
  .nav{gap:14px}
  .foot-grid{grid-template-columns:1fr 1fr;gap:28px}
  .foot-bottom{flex-direction:column;gap:10px;align-items:flex-start}
  .foot-bottom a{margin-left:0;margin-right:14px}
}
@media (max-width:640px){
  .container{padding:0 20px}
  .nav{padding:12px 20px}
  .nav-end .btn{padding:10px 16px;font-size:13px}
  .doc-page{padding:44px 0 72px}
  .doc-page h1{font-size:clamp(30px,7vw,40px)}
  .doc-page h2{font-size:22px;margin-top:36px}
  .doc-page p,.doc-page li{font-size:15px}
}
@media (max-width:420px){
  .foot-grid{grid-template-columns:1fr}
}