/* PaperNext marketing site — design system */

:root{
  --navy-950:#061a30;
  --navy-900:#0a2540;
  --navy-800:#0f2f52;
  --blue-600:#2563eb;
  --blue-500:#3b82f6;
  --blue-100:#e8f0fe;
  --ink:#111827;
  --ink-soft:#4b5563;
  --ink-faint:#8993a3;
  --bg:#ffffff;
  --bg-soft:#f5f7fb;
  --bg-card:#ffffff;
  --border:#e6e9f0;
  --radius-lg:20px;
  --radius-md:14px;
  --radius-sm:10px;
  --shadow-sm:0 1px 2px rgba(10,37,64,.06);
  --shadow-md:0 8px 24px rgba(10,37,64,.08);
  --shadow-lg:0 20px 48px rgba(10,37,64,.14);
  --max:1160px;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark){
  :root{
    --ink:#eef1f6;
    --ink-soft:#b7c0cd;
    --ink-faint:#7c8797;
    --bg:#0b1526;
    --bg-soft:#0f1c31;
    --bg-card:#12213a;
    --border:#1e2f47;
    --blue-100:#132a4d;
    --shadow-sm:0 1px 2px rgba(0,0,0,.3);
    --shadow-md:0 8px 24px rgba(0,0,0,.35);
    --shadow-lg:0 20px 48px rgba(0,0,0,.45);
  }
}

*, *::before, *::after{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }

body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  color:var(--ink);
  background:var(--bg);
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
}

img{ max-width:100%; display:block; }
a{ color:inherit; }
h1,h2,h3,h4{ line-height:1.15; margin:0 0 .5em; font-weight:700; letter-spacing:-.02em; }
p{ margin:0 0 1em; color:var(--ink-soft); }

.container{ max-width:var(--max); margin:0 auto; padding:0 24px; }

.skip-link{
  position:absolute; left:-999px; top:0; background:var(--blue-600); color:#fff;
  padding:12px 20px; border-radius:0 0 8px 0; z-index:1000; font-weight:600;
}
.skip-link:focus{ left:0; }

/* Buttons */
.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:8px;
  padding:13px 24px; border-radius:999px; font-weight:600; font-size:15px;
  text-decoration:none; border:1px solid transparent; cursor:pointer;
  transition:transform .15s ease, box-shadow .15s ease, background .15s ease, border-color .15s ease;
  white-space:nowrap;
}
.btn:active{ transform:scale(.98); }
.btn-primary{ background:var(--blue-600); color:#fff; box-shadow:var(--shadow-md); }
.btn-primary:hover{ background:var(--blue-500); box-shadow:var(--shadow-lg); }
.btn-ghost{ background:transparent; color:var(--ink); border-color:var(--border); }
.btn-ghost:hover{ border-color:var(--blue-500); color:var(--blue-600); }
.btn-on-dark{ background:#fff; color:var(--navy-900); }
.btn-on-dark:hover{ background:var(--blue-100); }
.btn-outline-dark{ background:transparent; color:#fff; border-color:rgba(255,255,255,.35); }
.btn-outline-dark:hover{ border-color:#fff; }
.btn-sm{ padding:8px 16px; font-size:13px; }

/* Header */
.site-header{
  position:sticky; top:0; z-index:100;
  background:color-mix(in srgb, var(--bg) 94%, transparent);
  -webkit-backdrop-filter:saturate(180%) blur(12px);
  backdrop-filter:saturate(180%) blur(12px);
  border-bottom:1px solid var(--border);
  transition:box-shadow .2s ease;
}
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))){
  .site-header{ background:var(--bg); }
}
.site-header.is-scrolled{ box-shadow:var(--shadow-sm); }
body.nav-open .site-header{
  background:var(--bg);
  -webkit-backdrop-filter:none;
  backdrop-filter:none;
}
.site-header .container{
  display:flex; align-items:center; justify-content:space-between;
  height:72px; gap:24px;
}
.brand{ display:flex; align-items:center; gap:10px; text-decoration:none; font-weight:800; font-size:18px; color:var(--ink); }
.brand img{ width:32px; height:32px; border-radius:8px; }
.nav-links{ display:flex; align-items:center; gap:28px; list-style:none; margin:0; padding:0; }
.nav-links a{ text-decoration:none; font-size:14.5px; font-weight:600; color:var(--ink-soft); }
.nav-links a:hover{ color:var(--blue-600); }
.header-actions{ display:flex; align-items:center; gap:14px; }
.lang-switch{ display:flex; gap:2px; font-size:13px; font-weight:700; }
.lang-switch a{ padding:6px 9px; border-radius:7px; text-decoration:none; color:var(--ink-faint); }
.lang-switch a.active{ background:var(--blue-100); color:var(--blue-600); }
.nav-toggle{ display:none; background:none; border:0; padding:8px; cursor:pointer; }
.nav-toggle svg{ display:block; }

@media (max-width:860px){
  .site-header{
    background:var(--bg);
    -webkit-backdrop-filter:none;
    backdrop-filter:none;
  }
  .nav-links{
    position:fixed; inset:72px 0 0 0; background:var(--bg); flex-direction:column;
    align-items:flex-start; padding:28px 24px; gap:22px; transform:translateY(-8px);
    opacity:0; pointer-events:none; transition:opacity .18s ease, transform .18s ease;
    border-top:1px solid var(--border); box-shadow:var(--shadow-md);
  }
  .nav-links a{ font-size:17px; }
  body.nav-open .nav-links{ opacity:1; transform:translateY(0); pointer-events:auto; }
  .nav-toggle{ display:block; }
  .header-actions .btn-primary.hide-mobile{ display:none; }
}

/* Hero */
@keyframes auroraMove{
  0%{ transform:translate(0,0) scale(1); }
  33%{ transform:translate(30px,-24px) scale(1.08); }
  66%{ transform:translate(-24px,18px) scale(.95); }
  100%{ transform:translate(0,0) scale(1); }
}
@keyframes gradShift{
  0%,100%{ background-position:0% 50%; }
  50%{ background-position:100% 50%; }
}
@keyframes fadeUp{
  from{ opacity:0; transform:translateY(18px); }
  to{ opacity:1; transform:translateY(0); }
}
@keyframes floatY{
  0%,100%{ transform:translateY(0) rotate(var(--r,0deg)); }
  50%{ transform:translateY(-14px) rotate(var(--r,0deg)); }
}
@keyframes chipFloat{
  0%,100%{ transform:translateY(0) scale(1); }
  50%{ transform:translateY(-9px) scale(1.03); }
}

.hero{ position:relative; padding:76px 0 40px; overflow:hidden; }
.hero-bg{ position:absolute; inset:0; z-index:0; overflow:hidden; pointer-events:none; }
.aurora{ position:absolute; border-radius:50%; filter:blur(70px); opacity:.5; animation:auroraMove 17s ease-in-out infinite; }
.aurora-1{ width:440px; height:440px; background:radial-gradient(circle, var(--blue-500), transparent 70%); top:-140px; left:-100px; }
.aurora-2{ width:380px; height:380px; background:radial-gradient(circle, #7c3aed66, transparent 70%); top:20px; right:-120px; animation-delay:-5s; animation-duration:20s; }
.aurora-3{ width:340px; height:340px; background:radial-gradient(circle, #06b6d466, transparent 70%); bottom:-160px; left:28%; animation-delay:-10s; animation-duration:23s; }
.hero-dots{
  position:absolute; inset:0; background-image:radial-gradient(var(--border) 1px, transparent 1px);
  background-size:22px 22px; opacity:.7;
  mask-image:radial-gradient(ellipse 60% 55% at 50% 30%, #000 40%, transparent 100%);
  -webkit-mask-image:radial-gradient(ellipse 60% 55% at 50% 30%, #000 40%, transparent 100%);
}

.hero .container{ position:relative; z-index:1; display:grid; grid-template-columns:1.1fr .9fr; gap:56px; align-items:center; }
.eyebrow{
  display:inline-flex; align-items:center; gap:8px; font-size:13px; font-weight:700;
  color:var(--blue-600); background:var(--blue-100); padding:7px 14px; border-radius:999px;
  margin-bottom:20px;
}
.eyebrow .dot{ width:7px; height:7px; border-radius:50%; background:var(--blue-600); }
.hero h1{ font-size:clamp(2.1rem,4vw,3.1rem); color:var(--ink); }
.grad-text{
  background:linear-gradient(90deg, var(--blue-600), #7c3aed, var(--blue-500), var(--blue-600));
  background-size:300% 100%;
  -webkit-background-clip:text; background-clip:text; -webkit-text-fill-color:transparent; color:transparent;
  animation:gradShift 6s ease-in-out infinite;
}
.hero .lede{ font-size:18px; max-width:52ch; }
.hero-ctas{ display:flex; gap:14px; flex-wrap:wrap; margin:28px 0 14px; }
.hero-ctas-secondary{ display:flex; gap:18px; flex-wrap:wrap; margin-bottom:26px; }
.hero-copy > *{ animation:fadeUp .7s ease both; }
.hero-copy > *:nth-child(1){ animation-delay:.02s; }
.hero-copy > *:nth-child(2){ animation-delay:.08s; }
.hero-copy > *:nth-child(3){ animation-delay:.14s; }
.hero-copy > *:nth-child(4){ animation-delay:.2s; }
.hero-copy > *:nth-child(5){ animation-delay:.26s; }
.hero-copy > *:nth-child(6){ animation-delay:.32s; }

/* App store buttons */
.store-buttons{ display:flex; gap:14px; flex-wrap:wrap; }
.btn-store{
  display:inline-flex; align-items:center; gap:10px; text-decoration:none;
  background:var(--navy-900); color:#fff; padding:10px 18px; border-radius:12px;
  box-shadow:var(--shadow-md); transition:transform .15s ease, background .15s ease, box-shadow .15s ease;
}
.btn-store:hover{ background:var(--navy-800); transform:translateY(-2px); box-shadow:var(--shadow-lg); }
.btn-store svg{ flex:none; }
.btn-store .store-text{ display:flex; flex-direction:column; line-height:1.25; }
.btn-store .store-text small{ font-size:10.5px; color:rgba(255,255,255,.72); }
.btn-store .store-text strong{ font-size:16px; font-weight:700; letter-spacing:-.01em; }
.btn-store.store-on-light{ background:#fff; color:var(--navy-900); }
.btn-store.store-on-light .store-text small{ color:var(--ink-faint); }
.trust-row{ display:flex; flex-wrap:wrap; gap:22px; padding-top:6px; border-top:1px solid var(--border); }
.trust-row span{ font-size:13.5px; font-weight:600; color:var(--ink-faint); display:flex; align-items:center; gap:7px; }
.trust-row svg{ flex:none; color:var(--blue-600); }

.hero-art{ position:relative; display:flex; justify-content:center; }
.phone{
  width:100%; max-width:280px; border-radius:24px; overflow:hidden;
  box-shadow:var(--shadow-lg); background:transparent;
}
.phone img{ display:block; width:100%; height:auto; }

.phone-stack{ position:relative; width:100%; max-width:300px; aspect-ratio:480/1043; margin:0 auto; }
.phone-stack .phone{ position:absolute; max-width:none; }
.phone-stack .phone-back{
  width:78%; top:4%; left:-8%; --r:-9deg; z-index:1;
  filter:brightness(.94); opacity:.92;
  animation:floatY 7s ease-in-out infinite;
}
.phone-stack .phone-front{
  width:84%; top:0; right:-6%; --r:5deg; z-index:2;
  animation:floatY 7s ease-in-out infinite; animation-delay:-3.2s;
}

.float-chip{
  position:absolute; z-index:3; display:flex; align-items:center; gap:8px;
  background:var(--bg-card); border:1px solid var(--border); box-shadow:var(--shadow-md);
  padding:9px 14px; border-radius:999px; font-size:13px; font-weight:700; color:var(--ink);
  animation:chipFloat 5s ease-in-out infinite;
}
.float-chip svg{ color:var(--blue-600); flex:none; }
.chip-1{ top:10%; left:-8%; animation-delay:-1s; }
.chip-2{ bottom:12%; right:-10%; animation-delay:-3s; }

@media (max-width:900px){
  .hero .container{ grid-template-columns:1fr; }
  .hero-art{ order:-1; margin-bottom:8px; }
  .phone{ max-width:220px; }
  .phone-stack{ max-width:220px; }
  .float-chip{ font-size:11px; padding:7px 11px; }
  .chip-1{ left:-2%; }
  .chip-2{ right:-2%; }
}

@media (prefers-reduced-motion: reduce){
  .aurora, .phone-stack .phone-back, .phone-stack .phone-front, .float-chip, .grad-text, .hero-copy > *{
    animation:none !important;
  }
}

/* Strip */
.strip{ border-top:1px solid var(--border); border-bottom:1px solid var(--border); background:var(--bg-soft); }
.strip .container{
  display:flex; flex-wrap:wrap; justify-content:center; gap:12px 40px; padding:20px 24px;
  font-size:13.5px; font-weight:700; color:var(--ink-faint); text-align:center;
}

/* Sections */
section{ padding:88px 0; }
.section-head{ max-width:640px; margin:0 auto 52px; text-align:center; }
.section-head h2{ font-size:clamp(1.7rem,3vw,2.3rem); }
.section-head p{ font-size:16.5px; }
.kicker{ color:var(--blue-600); font-weight:700; font-size:13.5px; letter-spacing:.06em; text-transform:uppercase; display:block; margin-bottom:10px; }

/* Feature grid */
.grid{ display:grid; gap:22px; }
.grid-3{ grid-template-columns:repeat(3,1fr); }
.grid-2{ grid-template-columns:repeat(2,1fr); }
@media (max-width:860px){ .grid-3{ grid-template-columns:repeat(2,1fr); } .grid-2{ grid-template-columns:1fr; } }
@media (max-width:600px){ .grid-3{ grid-template-columns:1fr; } }

.card{
  background:var(--bg-card); border:1px solid var(--border); border-radius:var(--radius-lg);
  padding:28px; box-shadow:var(--shadow-sm);
}
.feature-icon{
  width:46px; height:46px; border-radius:12px; background:var(--blue-100); color:var(--blue-600);
  display:flex; align-items:center; justify-content:center; margin-bottom:16px;
}
.card h3{ font-size:18px; margin-bottom:8px; }
.card p{ font-size:14.5px; margin-bottom:0; }

/* Screenshots */
.shot-row{ display:flex; gap:24px; overflow-x:auto; padding:8px 4px 20px; scroll-snap-type:x proximity; }
.shot-row .shot{ flex:none; width:220px; scroll-snap-align:start; text-align:center; }
.shot .phone{ max-width:220px; margin:0 auto 14px; }
.shot figcaption{ font-size:14px; font-weight:600; color:var(--ink-soft); }

/* Security split */
.split{ display:grid; grid-template-columns:1fr 1fr; gap:56px; align-items:center; }
@media (max-width:860px){ .split{ grid-template-columns:1fr; gap:32px; } }
.checklist{ list-style:none; margin:0; padding:0; display:flex; flex-direction:column; gap:16px; }
.checklist li{ display:flex; gap:12px; align-items:flex-start; font-size:15.5px; color:var(--ink); }
.checklist svg{ flex:none; margin-top:2px; color:#16a34a; }
.checklist strong{ display:block; margin-bottom:2px; }
.checklist span.desc{ color:var(--ink-soft); font-size:14px; }

.panel-dark{
  background:linear-gradient(160deg,var(--navy-900),var(--navy-950));
  color:#fff; border-radius:var(--radius-lg); padding:36px;
}
.panel-dark p{ color:rgba(255,255,255,.72); }
.panel-dark h3{ color:#fff; }

/* Community cards */
.community-card{
  display:flex; gap:16px; align-items:flex-start; text-decoration:none;
  background:var(--bg-card); border:1px solid var(--border); border-radius:var(--radius-md);
  padding:22px; transition:border-color .15s ease, transform .15s ease;
}
.community-card:hover{ border-color:var(--blue-500); transform:translateY(-2px); }
.community-card .feature-icon{ margin-bottom:0; }
.community-card h3{ font-size:16.5px; margin-bottom:4px; }
.community-card p{ font-size:14px; margin-bottom:0; }
.community-card .arrow{ margin-left:auto; align-self:center; color:var(--ink-faint); }

/* FAQ */
.faq{ max-width:760px; margin:0 auto; }
.faq details{
  border-bottom:1px solid var(--border); padding:20px 0;
}
.faq summary{
  cursor:pointer; font-weight:700; font-size:16.5px; list-style:none;
  display:flex; justify-content:space-between; align-items:center; gap:16px;
}
.faq summary::-webkit-details-marker{ display:none; }
.faq summary::after{
  content:"+"; font-size:22px; font-weight:400; color:var(--blue-600); flex:none;
  transition:transform .2s ease;
}
.faq details[open] summary::after{ transform:rotate(45deg); }
.faq details p{ margin-top:12px; font-size:15px; }

/* CTA banner */
.cta-banner{
  background:linear-gradient(135deg,var(--navy-900),var(--blue-600));
  border-radius:var(--radius-lg); padding:56px; text-align:center; color:#fff;
}
.cta-banner h2{ color:#fff; }
.cta-banner p{ color:rgba(255,255,255,.82); max-width:52ch; margin:0 auto 28px; }
.cta-actions{ display:flex; gap:14px; justify-content:center; flex-wrap:wrap; }

/* Footer */
.site-footer{ border-top:1px solid var(--border); padding:64px 0 32px; background:var(--bg-soft); }
.footer-grid{ display:grid; grid-template-columns:1.4fr 1fr 1fr 1fr; gap:40px; margin-bottom:48px; }
@media (max-width:760px){ .footer-grid{ grid-template-columns:1fr 1fr; } }
.footer-grid h4{ font-size:13px; text-transform:uppercase; letter-spacing:.05em; color:var(--ink-faint); margin-bottom:16px; }
.footer-grid ul{ list-style:none; margin:0; padding:0; display:flex; flex-direction:column; gap:11px; }
.footer-grid a{ text-decoration:none; font-size:14.5px; color:var(--ink-soft); }
.footer-grid a:hover{ color:var(--blue-600); }
.footer-brand p{ font-size:14px; max-width:34ch; }
.footer-bottom{
  display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:16px;
  padding-top:28px; border-top:1px solid var(--border); font-size:13.5px; color:var(--ink-faint);
}
.footer-bottom .lang-switch{ font-size:13.5px; }

/* Legal pages */
.legal-page{ padding:56px 0 100px; }
.legal-page .container{ max-width:760px; }
.legal-page h1{ font-size:2rem; margin-bottom:6px; }
.legal-updated{ color:var(--ink-faint); font-size:14px; margin-bottom:40px; }
.legal-page h2{ font-size:1.2rem; margin-top:36px; }
.legal-page ul{ color:var(--ink-soft); padding-left:20px; }
.legal-page li{ margin-bottom:6px; }
.back-link{ display:inline-flex; align-items:center; gap:6px; font-weight:600; font-size:14px; color:var(--blue-600); text-decoration:none; margin-bottom:28px; }

.visually-hidden{
  position:absolute; width:1px; height:1px; padding:0; margin:-1px; overflow:hidden;
  clip:rect(0,0,0,0); white-space:nowrap; border:0;
}