/* ==========================================================================
   ToolsCrow Image Converter — Design System
   Mobile-first · Modern · Professional
   ========================================================================== */
:root{
  --bg:#0a0f1e;
  --bg-soft:#0e1528;
  --surface:#121a33;
  --surface-2:#17203d;
  --border:rgba(148,163,206,.14);
  --border-strong:rgba(148,163,206,.28);
  --text:#eef1fb;
  --muted:#9aa6c6;
  --muted-2:#6b7799;
  --accent:#6d5ef0;
  --accent-2:#38bdf8;
  --grad:linear-gradient(135deg,#6d5ef0 0%,#38bdf8 100%);
  --grad-soft:linear-gradient(135deg,rgba(109,94,240,.16),rgba(56,189,248,.16));
  --success:#34d399;
  --danger:#fb7185;
  --radius:16px;
  --radius-sm:10px;
  --shadow:0 18px 50px -18px rgba(2,6,23,.7);
  --font:'Inter',system-ui,-apple-system,'Segoe UI',Roboto,Arial,sans-serif;
  --mono:ui-monospace,'SF Mono',Menlo,Consolas,monospace;
  --maxw:1120px;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:var(--font);
  background:var(--bg);
  color:var(--text);
  line-height:1.6;
  font-size:16px;
  min-height:100vh;
  display:flex;
  flex-direction:column;
  overflow-x:hidden;
}
body::before{
  content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;
  background:
    radial-gradient(640px 420px at 12% -8%,rgba(109,94,240,.20),transparent 60%),
    radial-gradient(640px 420px at 92% 4%,rgba(56,189,248,.13),transparent 60%),
    radial-gradient(900px 600px at 50% 110%,rgba(109,94,240,.08),transparent 60%);
}
img{max-width:100%;height:auto;display:block}
a{color:var(--accent-2);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3,h4{line-height:1.2;font-weight:800;letter-spacing:-.02em}
h1{font-size:clamp(1.75rem,5vw,2.9rem)}
h2{font-size:clamp(1.35rem,3.5vw,1.9rem)}
h3{font-size:1.15rem}
p{color:var(--muted)}
.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 1rem}
main{flex:1}
:focus-visible{outline:2px solid var(--accent-2);outline-offset:2px;border-radius:4px}

/* ---------- Header ---------- */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(10,15,30,.82);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid var(--border);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:62px}
.logo{display:flex;align-items:center;gap:.6rem;font-weight:800;font-size:1.15rem;color:var(--text)}
.logo:hover{text-decoration:none}
.logo svg{width:30px;height:30px;flex-shrink:0}
.logo .crow{color:var(--accent-2)}
.nav-toggle{
  display:inline-flex;align-items:center;justify-content:center;
  width:42px;height:42px;border:1px solid var(--border);border-radius:var(--radius-sm);
  background:var(--surface);color:var(--text);cursor:pointer;
}
.nav-toggle svg{width:20px;height:20px}
.site-nav{
  position:fixed;inset:62px 0 auto 0;z-index:49;
  background:var(--bg-soft);border-bottom:1px solid var(--border);
  padding:1rem;display:none;flex-direction:column;gap:.25rem;
  max-height:calc(100vh - 62px);overflow-y:auto;
}
.site-nav.open{display:flex}
.site-nav a{
  color:var(--text);padding:.7rem .9rem;border-radius:var(--radius-sm);
  font-weight:600;font-size:.95rem;
}
.site-nav a:hover{background:var(--surface);text-decoration:none}
.site-nav .nav-cta{
  background:var(--grad);color:#fff;text-align:center;margin-top:.5rem;
  box-shadow:0 8px 24px -8px rgba(109,94,240,.6);
}
@media(min-width:860px){
  .nav-toggle{display:none}
  .site-nav{position:static;display:flex;flex-direction:row;align-items:center;background:none;border:0;padding:0;max-height:none;overflow:visible}
  .site-nav a{padding:.5rem .8rem}
  .site-nav .nav-cta{margin:0 0 0 .5rem;padding:.55rem 1.1rem !important;color:#fff}
  .site-nav .nav-cta:hover{filter:brightness(1.1)}
}

/* ---------- Hero ---------- */
.hero{padding:3.2rem 0 2.4rem;text-align:center}
.hero .badge{
  display:inline-flex;align-items:center;gap:.5rem;
  font-size:.8rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase;
  color:var(--accent-2);background:var(--grad-soft);
  border:1px solid var(--border);padding:.4rem .95rem;border-radius:999px;margin-bottom:1.2rem;
}
.hero h1 span.grad,.grad-text{
  background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero p.lead{max-width:640px;margin:1.1rem auto 0;font-size:1.05rem}
.hero-stats{
  display:flex;flex-wrap:wrap;justify-content:center;gap:1.6rem;margin-top:2rem;
}
.hero-stats div{text-align:center}
.hero-stats b{display:block;font-size:1.4rem;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-stats span{font-size:.8rem;color:var(--muted-2);text-transform:uppercase;letter-spacing:.06em}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5rem;
  padding:.8rem 1.5rem;border-radius:var(--radius-sm);border:1px solid transparent;
  font-weight:700;font-size:.95rem;cursor:pointer;font-family:var(--font);
  transition:transform .15s ease,filter .15s ease,background .15s ease;
  text-decoration:none !important;
}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 10px 30px -10px rgba(109,94,240,.7)}
.btn-primary:hover{filter:brightness(1.12);transform:translateY(-1px)}
.btn-ghost{background:var(--surface);border-color:var(--border);color:var(--text)}
.btn-ghost:hover{background:var(--surface-2);border-color:var(--border-strong)}
.btn-sm{padding:.5rem 1rem;font-size:.85rem}
.btn:disabled{opacity:.45;cursor:not-allowed;transform:none;filter:none}

/* ---------- Section ---------- */
.section{padding:2.6rem 0}
.section-head{text-align:center;max-width:640px;margin:0 auto 2rem}
.section-head p{margin-top:.6rem}

/* ---------- Tool cards grid ---------- */
.grid{display:grid;gap:1rem;grid-template-columns:1fr}
@media(min-width:560px){.grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:900px){.grid{grid-template-columns:repeat(3,1fr)}}
.tool-card{
  display:flex;align-items:center;gap:.9rem;
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  padding:1.05rem 1.1rem;color:var(--text);
  transition:transform .18s ease,border-color .18s ease,box-shadow .18s ease;
}
.tool-card:hover{transform:translateY(-3px);border-color:var(--accent);box-shadow:var(--shadow);text-decoration:none}
.tool-card .pair{
  width:52px;height:52px;flex-shrink:0;border-radius:12px;
  background:var(--grad-soft);border:1px solid var(--border);
  display:flex;align-items:center;justify-content:center;
  font-family:var(--mono);font-size:.66rem;font-weight:700;color:var(--accent-2);
  text-align:center;line-height:1.25;
}
.tool-card h3{font-size:.98rem;font-weight:700}
.tool-card p{font-size:.82rem;margin-top:.15rem}
.tool-card .arrow{margin-left:auto;color:var(--muted-2);flex-shrink:0}

/* ---------- Converter widget ---------- */
.converter-shell{
  background:var(--surface);border:1px solid var(--border);border-radius:22px;
  padding:1.1rem;box-shadow:var(--shadow);
}
@media(min-width:720px){.converter-shell{padding:1.8rem}}
.dropzone{
  border:2px dashed var(--border-strong);border-radius:var(--radius);
  background:var(--bg-soft);padding:2.6rem 1.2rem;text-align:center;cursor:pointer;
  transition:border-color .2s ease,background .2s ease;
}
.dropzone:hover,.dropzone.drag{border-color:var(--accent-2);background:rgba(56,189,248,.06)}
.dropzone svg{width:46px;height:46px;margin:0 auto .9rem;color:var(--accent-2)}
.dropzone h3{font-size:1.05rem}
.dropzone p{font-size:.85rem;margin-top:.35rem}
.dropzone .browse{color:var(--accent-2);font-weight:700;text-decoration:underline}
.controls{
  display:grid;gap:.9rem;margin-top:1.1rem;
  grid-template-columns:1fr;
}
@media(min-width:640px){.controls{grid-template-columns:repeat(3,1fr)}}
.control{
  background:var(--bg-soft);border:1px solid var(--border);border-radius:var(--radius-sm);
  padding:.75rem .9rem;
}
.control label{display:block;font-size:.72rem;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:var(--muted-2);margin-bottom:.35rem}
.control select,.control input[type=number],.control input[type=text]{
  width:100%;background:var(--surface);border:1px solid var(--border);border-radius:8px;
  color:var(--text);padding:.5rem .6rem;font-family:var(--font);font-size:.9rem;
}
.control input[type=range]{width:100%;accent-color:var(--accent)}
.control .val{font-size:.8rem;color:var(--accent-2);font-weight:700;margin-left:.4rem}
.results{margin-top:1.2rem;display:none}
.results.active{display:block}
.result-head{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:.7rem;margin-bottom:.8rem}
.result-head h3{font-size:1rem}
.file-row{
  display:flex;align-items:center;gap:.8rem;background:var(--bg-soft);
  border:1px solid var(--border);border-radius:var(--radius-sm);
  padding:.6rem .75rem;margin-bottom:.55rem;flex-wrap:wrap;
}
.file-row img{width:46px;height:46px;object-fit:cover;border-radius:8px;border:1px solid var(--border)}
.file-row .meta{flex:1;min-width:140px}
.file-row .meta b{display:block;font-size:.85rem;word-break:break-all}
.file-row .meta span{font-size:.75rem;color:var(--muted-2)}
.file-row .saved{font-size:.72rem;font-weight:700;color:var(--success)}
.file-row .saved.neg{color:var(--danger)}
.file-row .status-err{color:var(--danger);font-size:.78rem;font-weight:600}
.progressbar{height:6px;background:var(--surface-2);border-radius:99px;overflow:hidden;margin-top:.9rem;display:none}
.progressbar.active{display:block}
.progressbar i{display:block;height:100%;width:0;background:var(--grad);transition:width .2s ease}
.tool-note{margin-top:1rem;font-size:.8rem;color:var(--muted-2);display:flex;gap:.5rem;align-items:flex-start}
.tool-note svg{width:16px;height:16px;flex-shrink:0;margin-top:.2rem;color:var(--success)}

/* ---------- Breadcrumb ---------- */
.breadcrumb{padding:1rem 0 0;font-size:.82rem;color:var(--muted-2)}
.breadcrumb ol{list-style:none;display:flex;flex-wrap:wrap;gap:.4rem}
.breadcrumb li+li::before{content:"/";margin-right:.4rem;color:var(--muted-2)}
.breadcrumb a{color:var(--muted)}

/* ---------- Content / article ---------- */
.page-head{padding:1.6rem 0 1.2rem;text-align:center}
.page-head p{margin-top:.7rem;max-width:620px;margin-left:auto;margin-right:auto}
.article{max-width:760px;margin:0 auto;padding:2.2rem 0}
.article h2{margin:2rem 0 .8rem}
.article h3{margin:1.4rem 0 .5rem}
.article p,.article li{color:var(--muted);margin-bottom:.8rem}
.article ul,.article ol{padding-left:1.3rem}
.article li{margin-bottom:.4rem}
.article strong{color:var(--text)}
.steps{counter-reset:s;list-style:none;padding:0 !important;margin:1.2rem 0}
.steps li{
  counter-increment:s;position:relative;padding:.9rem .9rem .9rem 3.4rem;
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);margin-bottom:.7rem;
}
.steps li::before{
  content:counter(s);position:absolute;left:.9rem;top:50%;transform:translateY(-50%);
  width:1.9rem;height:1.9rem;border-radius:50%;background:var(--grad);color:#fff;
  display:flex;align-items:center;justify-content:center;font-weight:800;font-size:.9rem;
}
.steps li b{color:var(--text)}
.steps li span{display:block;font-size:.88rem}

/* ---------- Feature cards ---------- */
.features{display:grid;gap:1rem;grid-template-columns:1fr}
@media(min-width:620px){.features{grid-template-columns:repeat(2,1fr)}}
@media(min-width:960px){.features{grid-template-columns:repeat(3,1fr)}}
.feature{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  padding:1.4rem;
}
.feature svg{width:30px;height:30px;color:var(--accent-2);margin-bottom:.8rem}
.feature h3{margin-bottom:.4rem}
.feature p{font-size:.88rem}

/* ---------- FAQ ---------- */
.faq{max-width:760px;margin:0 auto}
.faq details{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);
  margin-bottom:.7rem;overflow:hidden;
}
.faq summary{
  cursor:pointer;list-style:none;padding:1rem 1.1rem;font-weight:700;font-size:.95rem;
  display:flex;justify-content:space-between;align-items:center;gap:1rem;
}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--accent-2);font-size:1.3rem;font-weight:400;flex-shrink:0}
.faq details[open] summary::after{content:"–"}
.faq details p{padding:0 1.1rem 1rem;font-size:.9rem}

/* ---------- Table ---------- */
.table-wrap{overflow-x:auto;border:1px solid var(--border);border-radius:var(--radius);margin:1.2rem 0}
table.compare{width:100%;border-collapse:collapse;font-size:.88rem;min-width:520px}
table.compare th,table.compare td{padding:.7rem .9rem;text-align:left;border-bottom:1px solid var(--border)}
table.compare th{background:var(--surface-2);font-size:.75rem;text-transform:uppercase;letter-spacing:.05em;color:var(--muted-2)}
table.compare tr:last-child td{border-bottom:0}
table.compare td{color:var(--muted)}
table.compare td:first-child{color:var(--text);font-weight:600}

/* ---------- CTA band ---------- */
.cta-band{
  background:var(--grad-soft);border:1px solid var(--border);border-radius:22px;
  padding:2.2rem 1.4rem;text-align:center;margin:2.5rem 0;
}
.cta-band h2{margin-bottom:.6rem}
.cta-band p{max-width:520px;margin:0 auto 1.3rem}

/* ---------- Footer ---------- */
.site-footer{border-top:1px solid var(--border);background:var(--bg-soft);margin-top:3rem}
.footer-grid{display:grid;gap:2rem;grid-template-columns:1fr;padding:2.6rem 0 2rem}
@media(min-width:720px){.footer-grid{grid-template-columns:1.4fr 1fr 1fr 1fr}}
.site-footer h4{font-size:.8rem;text-transform:uppercase;letter-spacing:.08em;color:var(--muted-2);margin-bottom:.9rem}
.site-footer ul{list-style:none}
.site-footer li{margin-bottom:.5rem}
.site-footer a{color:var(--muted);font-size:.88rem}
.site-footer a:hover{color:var(--accent-2)}
.footer-brand p{font-size:.85rem;margin-top:.8rem;max-width:300px}
.footer-bottom{
  border-top:1px solid var(--border);padding:1.1rem 0;text-align:center;
  font-size:.8rem;color:var(--muted-2);
}

/* ---------- Utilities ---------- */
.text-center{text-align:center}
.mt-1{margin-top:.6rem}.mt-2{margin-top:1.2rem}.mt-3{margin-top:2rem}
.skip-link{position:absolute;left:-9999px}
.skip-link:focus{left:1rem;top:.5rem;background:var(--surface);padding:.5rem 1rem;border-radius:8px;z-index:100}
@media (prefers-reduced-motion:reduce){*{transition:none !important;scroll-behavior:auto !important}}