/* ImageConvertPro — design system v2 (brand: indigo/cyan, light theme)
   Tokens and rationale: see BRAND.md */
:root{
  --ink:#0F172A; --ink-soft:#475569; --bg:#F8FAFC; --card:#ffffff;
  --line:#E2E8F0; --brand:#312E81; --brand-dark:#23205E; --accent:#06B6D4;
  --accent-ink:#0E7490; --tint:#EEF0FF;
  --danger:#B3261E; --danger-bg:#FDECEA; --ok:#15803D; --ok-bg:#EAF7EE;
  --warn:#92400E; --warn-bg:#FFFBEB;
  --radius:14px;
  --shadow:0 1px 3px rgba(15,23,42,.07),0 8px 24px rgba(15,23,42,.05);
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);
  font-family:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  line-height:1.55;font-size:16px}
a{color:var(--accent-ink)}
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,[tabindex]:focus-visible{
  outline:3px solid var(--accent);outline-offset:2px;border-radius:6px}
.wrap{max-width:1060px;margin:0 auto;padding:0 16px}
/* header */
header.site{background:var(--card);border-bottom:1px solid var(--line)}
header.site .wrap{display:flex;align-items:center;gap:14px;padding-top:12px;padding-bottom:12px;flex-wrap:wrap}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:1.22rem;
  color:var(--ink);text-decoration:none;letter-spacing:-.02em}
.logo img{width:34px;height:34px;display:block}
.logo strong{color:var(--brand);font-weight:800}
nav.main{display:flex;gap:4px;flex-wrap:wrap;margin-left:auto}
nav.main a{color:var(--ink-soft);text-decoration:none;padding:8px 10px;border-radius:8px;font-size:.95rem}
nav.main a:hover{background:var(--bg);color:var(--ink)}
nav.main a[aria-current="page"]{color:var(--brand);font-weight:700}
/* hero + cards */
.hero{padding:34px 0 8px}
.hero h1{font-size:1.9rem;line-height:1.2;margin:0 0 10px;letter-spacing:-.02em}
.hero p{color:var(--ink-soft);max-width:640px;margin:0}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:14px;margin:22px 0}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:18px;box-shadow:var(--shadow)}
.card h3{margin:0 0 6px;font-size:1.05rem}
.card p{margin:0;color:var(--ink-soft);font-size:.93rem}
.card a.btn{margin-top:12px}
.tag{display:inline-block;font-size:.72rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase;
  color:var(--brand);background:var(--tint);border-radius:999px;padding:3px 9px;margin-bottom:10px}
.tag.soon{color:#7a5b12;background:#fdf1d7}
/* tool workspace */
.toolbox{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow);padding:20px;margin:20px 0}
.dropzone{border:2px dashed #c3c9ec;border-radius:var(--radius);padding:28px 16px;text-align:center;
  background:#fcfcff;cursor:pointer;transition:border-color .15s,background .15s}
.dropzone:hover,.dropzone.drag{border-color:var(--brand);background:var(--tint)}
.dropzone strong{display:block;font-size:1.05rem;margin-bottom:4px}
.dropzone small{color:var(--ink-soft)}
.controls{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:14px;margin:18px 0}
.field label{display:block;font-weight:600;font-size:.9rem;margin-bottom:6px}
.field input[type="number"],.field input[type="text"],.field select{width:100%;padding:11px 12px;
  border:1px solid var(--line);border-radius:10px;font-size:1rem;background:#fff;color:var(--ink)}
.field input[type="range"]{width:100%}
.checkline{display:flex;align-items:center;gap:8px;font-size:.95rem;margin-top:8px}
.checkline input{width:18px;height:18px;accent-color:var(--brand)}
.chips{display:flex;gap:8px;flex-wrap:wrap;margin-top:8px}
.chip{border:1px solid var(--line);background:#fff;border-radius:999px;padding:6px 13px;
  font-size:.88rem;cursor:pointer;color:var(--ink)}
.chip[aria-pressed="true"]{background:var(--brand);border-color:var(--brand);color:#fff;font-weight:700}
.btn{display:inline-block;background:var(--brand);color:#fff;border:0;border-radius:10px;
  padding:12px 22px;font-size:1rem;font-weight:700;cursor:pointer;text-decoration:none}
.btn:hover{background:var(--brand-dark)}
.btn.secondary{background:#fff;color:var(--brand);border:1px solid var(--brand)}
.btn[disabled]{opacity:.55;cursor:not-allowed}
.status{margin:14px 0;padding:12px 14px;border-radius:10px;background:var(--tint);color:var(--ink);display:none}
.status.error{background:var(--danger-bg);color:var(--danger);display:block}
.status.warn{background:var(--warn-bg);color:var(--warn);display:block}
.status.show{display:block}
.result{display:none;margin-top:18px;border-top:1px solid var(--line);padding-top:18px}
.result.show{display:block}
.result figure{margin:0 0 12px;text-align:center}
.result img{max-width:100%;max-height:340px;border-radius:10px;border:1px solid var(--line)}
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:10px;margin:12px 0}
.stat{background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:10px 12px}
.stat b{display:block;font-size:1.05rem}
.stat small{color:var(--ink-soft)}
.note{font-size:.9rem;color:var(--ink-soft)}
.note.warn{color:var(--warn)}
/* content */
.content{max-width:760px}
.content h2{margin:30px 0 8px;font-size:1.35rem}
.content h3{margin:20px 0 6px;font-size:1.08rem}
.content p,.content li{color:var(--ink-soft)}
.content ul,.content ol{padding-left:22px}
table.spec{border-collapse:collapse;width:100%;margin:12px 0;font-size:.94rem}
table.spec th,table.spec td{border:1px solid var(--line);padding:8px 10px;text-align:left}
table.spec th{background:#f1f5f9}
/* footer */
footer.site{margin-top:44px;background:var(--card);border-top:1px solid var(--line)}
footer.site .wrap{padding-top:20px;padding-bottom:26px;color:var(--ink-soft);font-size:.92rem}
footer.site nav{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:8px}
footer.site a{color:var(--ink-soft);text-decoration:none}
footer.site a:hover{color:var(--ink)}
.btnrow{display:flex;gap:8px;flex-wrap:wrap;margin:10px 0}
.btn.small{padding:9px 15px;font-size:.93rem}
.stage{margin:14px 0;text-align:center}
.stage canvas{max-width:100%;height:auto;border:1px solid var(--line);border-radius:10px;background:#fff}
@media (max-width:560px){.hero h1{font-size:1.55rem}.toolbox{padding:16px}}

/* Skip-to-content link (v2): visually hidden until keyboard focus */
.skip-link{position:absolute;left:16px;top:-80px;z-index:200;background:#312E81;color:#fff;
padding:10px 18px;border-radius:8px;text-decoration:none;font-weight:600}
.skip-link:focus{top:12px;color:#fff;outline:3px solid #06B6D4;outline-offset:2px}