/* ============================================================
   Pdfbg design system v1 — premium dark theme
   Palette: #0a0f24 page · violet #7c5cff → cyan #38e1ff
   System font stack only (no webfonts). Static site.
   ============================================================ */
:root{
  --bg:#0a0f24;
  --bg-soft:#0d1330;
  --violet:#7c5cff;
  --cyan:#38e1ff;
  --grad:linear-gradient(135deg,#7c5cff 0%,#38e1ff 100%);
  --text:#eef1ff;
  --muted:#a6afcf;
  --glass:rgba(255,255,255,.055);
  --glass-strong:rgba(255,255,255,.09);
  --glass-border:rgba(255,255,255,.13);
  --shadow:0 14px 44px rgba(0,0,0,.45);
  --radius:18px;
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --maxw:1120px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  background:var(--bg);
  color:var(--text);
  font-family:var(--font);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
/* ambient background glows */
body::before{
  content:"";
  position:fixed;inset:0;z-index:-1;pointer-events:none;
  background:
    radial-gradient(640px 420px at 12% -4%,rgba(124,92,255,.20),transparent 62%),
    radial-gradient(720px 460px at 88% 8%,rgba(56,225,255,.13),transparent 62%),
    radial-gradient(900px 700px at 50% 110%,rgba(124,92,255,.10),transparent 60%);
}
::selection{background:rgba(124,92,255,.55);color:#fff}
img{max-width:100%;display:block}
a{color:inherit}
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px}

/* ---------- header ---------- */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:100;
  transition:background .3s ease,border-color .3s ease;
  border-bottom:1px solid transparent;
}
.site-header.scrolled{
  background:rgba(10,15,36,.74);
  -webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);
  border-bottom-color:var(--glass-border);
}
.progress-bar{
  position:absolute;top:0;left:0;height:3px;width:0;
  background:var(--grad);border-radius:0 3px 3px 0;
}
.nav{display:flex;align-items:center;justify-content:space-between;padding:18px 24px;transition:padding .3s ease;position:relative}
.site-header.scrolled .nav{padding:10px 24px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;font-weight:800;font-size:1.3rem;letter-spacing:-.01em}
.brand-logo{
  width:34px;height:34px;
  animation:coinspin 10s linear infinite;
  filter:drop-shadow(0 4px 12px rgba(124,92,255,.45));
}
@keyframes coinspin{to{transform:rotateY(360deg)}}
.nav-links{display:flex;align-items:center;gap:6px;list-style:none}
.nav-links a{
  display:block;padding:9px 15px;border-radius:999px;text-decoration:none;
  color:var(--muted);font-weight:600;font-size:.95rem;transition:color .2s,background .2s;
}
.nav-links a:hover{color:var(--text);background:var(--glass)}
.nav-toggle{
  display:none;background:none;border:0;cursor:pointer;
  flex-direction:column;gap:5px;padding:10px;margin:-10px;
}
.nav-toggle span{display:block;width:24px;height:2px;background:var(--text);border-radius:2px;transition:transform .3s,opacity .3s}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
@media(max-width:760px){
  .nav-toggle{display:flex}
  .nav-links{
    display:none;position:absolute;top:100%;left:0;right:0;
    flex-direction:column;align-items:stretch;gap:2px;
    padding:10px 24px 18px;
    background:rgba(10,15,36,.97);
    -webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);
    border-bottom:1px solid var(--glass-border);
  }
  .nav-links.open{display:flex}
  .nav-links a{padding:12px 14px}
}

/* ---------- hero ---------- */
.hero{position:relative;min-height:34vh;display:flex;align-items:center;overflow:hidden;padding:56px 0 28px}
.hero-canvas{position:absolute;inset:0;width:100%;height:100%;display:block}
.hero-inner{position:relative;z-index:1;text-align:center;max-width:780px}
.hero-title{
  font-size:clamp(2.5rem,6.4vw,4.4rem);
  font-weight:800;letter-spacing:-.025em;line-height:1.08;
}
.hero-title .hero-grad{
  background:var(--grad);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero-sub{
  color:var(--muted);font-size:clamp(1rem,2.4vw,1.22rem);
  margin:20px auto 34px;max-width:660px;
}
.hero-ctas{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  padding:14px 32px;border-radius:999px;font-weight:700;font-size:1rem;
  text-decoration:none;cursor:pointer;border:0;font-family:var(--font);
  transition:transform .2s ease,box-shadow .25s ease,background .2s;
}
.btn-primary{background:var(--grad);color:#071120;box-shadow:0 10px 32px rgba(124,92,255,.42)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 14px 40px rgba(124,92,255,.55)}
.btn-ghost{
  background:var(--glass);color:var(--text);
  border:1px solid var(--glass-border);
  -webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);
}
.btn-ghost:hover{transform:translateY(-2px);background:var(--glass-strong)}

/* ---------- sections ---------- */
section{scroll-margin-top:84px}
.tools-section{padding:28px 0 20px}
.section-title{
  font-size:clamp(1.7rem,4vw,2.5rem);font-weight:800;letter-spacing:-.02em;
  text-align:center;margin-bottom:30px;
}
.section-title .hero-grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.tool-grid{
  display:grid;gap:20px;
  grid-template-columns:repeat(auto-fit,minmax(240px,1fr));
}
.tool-card{
  display:block;text-decoration:none;
  background:var(--glass);
  border:1px solid var(--glass-border);
  border-radius:var(--radius);
  padding:28px 24px;
  -webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);
  box-shadow:var(--shadow);
  transform:perspective(900px) rotateX(var(--rx,0deg)) rotateY(var(--ry,0deg));
  transition:transform .18s ease,box-shadow .3s ease,border-color .3s ease;
  will-change:transform;
}
.tool-card:hover{border-color:rgba(124,92,255,.5);box-shadow:0 18px 52px rgba(0,0,0,.55),0 0 0 1px rgba(124,92,255,.25)}
.tool-card h3{font-size:1.12rem;font-weight:700;margin:16px 0 6px;letter-spacing:-.01em}
.tool-card p{color:var(--muted);font-size:.93rem;line-height:1.55}
.tool-icon{
  display:inline-flex;align-items:center;justify-content:center;
  width:52px;height:52px;border-radius:14px;
  background:var(--grad);color:#071120;
  box-shadow:0 8px 22px rgba(124,92,255,.4);
}
.tool-icon svg{width:27px;height:27px}

/* ---------- "why" feature strip (page-specific: card- prefix) ---------- */
.card-features{padding:28px 0}
.card-feature-grid{display:grid;gap:20px;grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.card-feature{
  background:var(--glass);border:1px solid var(--glass-border);
  border-radius:var(--radius);padding:28px 26px;
  -webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);
}
.card-feature h3{font-size:1.08rem;margin:14px 0 6px}
.card-feature p{color:var(--muted);font-size:.93rem}
.card-feature-icon{
  display:inline-flex;align-items:center;justify-content:center;
  width:46px;height:46px;border-radius:13px;
  background:rgba(124,92,255,.16);border:1px solid rgba(124,92,255,.35);color:var(--cyan);
}
.card-feature-icon svg{width:24px;height:24px}

/* ---------- FAQ ---------- */
.faq{padding:24px 0 32px}
.faq-item{
  background:var(--glass);border:1px solid var(--glass-border);
  border-radius:14px;margin-bottom:14px;overflow:hidden;
  -webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);
}
.faq-item summary{
  cursor:pointer;list-style:none;padding:19px 22px;font-weight:700;font-size:1.02rem;
  display:flex;justify-content:space-between;align-items:center;gap:14px;
}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{
  content:"+";flex:0 0 auto;font-size:1.5rem;font-weight:400;line-height:1;
  background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;
  transition:transform .25s ease;
}
.faq-item[open] summary::after{transform:rotate(45deg)}
.faq-item p{padding:0 22px 20px;color:var(--muted);font-size:.95rem}

/* ---------- footer ---------- */
.site-footer{
  border-top:1px solid var(--glass-border);
  background:rgba(8,12,29,.7);
  padding:40px 0 0;margin-top:0;
}
.footer-grid{
  display:grid;gap:36px;
  grid-template-columns:1.4fr 1fr 1fr 1fr;
  padding-bottom:40px;
}
.foot-brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:1.2rem;text-decoration:none}
.foot-brand img{width:30px;height:30px;animation:coinspin 10s linear infinite}
.foot-tag{color:var(--muted);font-size:.92rem;margin-top:12px;max-width:280px}
.footer-grid h4{font-size:.82rem;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);margin-bottom:14px}
.footer-grid ul{list-style:none}
.footer-grid ul a{
  display:inline-block;color:var(--muted);text-decoration:none;font-size:.94rem;
  padding:4px 0;transition:color .2s;
}
.footer-grid ul a:hover{color:var(--cyan)}
.copyright{
  text-align:center;color:var(--muted);font-size:.85rem;
  padding:22px 0;border-top:1px solid var(--glass-border);
}
@media(max-width:760px){
  .footer-grid{grid-template-columns:1fr 1fr}
  .hero{min-height:40vh;padding:64px 0 32px}
}
@media(max-width:440px){
  .footer-grid{grid-template-columns:1fr}
}

/* ---------- ad slots (disabled until AdSense approval) ---------- */
.ad-slot{display:none}
body.ads-enabled .ad-slot{
  display:flex;align-items:center;justify-content:center;
  min-height:90px;max-width:728px;margin:26px auto;
  border:1px dashed var(--glass-border);border-radius:12px;
  color:var(--muted);font-size:.85rem;
}

/* ---------- scroll reveal ---------- */
.reveal{
  opacity:0;transform:translateY(26px);
  transition:opacity .7s ease,transform .7s ease;
  transition-delay:var(--d,0s);
}
.reveal.visible{opacity:1;transform:none}

/* ---------- reduced motion ---------- */
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .brand-logo,.foot-brand img{animation:none}
  .reveal{opacity:1;transform:none}
}