/* File Tools For All — design system v1 (mobile-first) */
:root{
  --brand:#4f46e5; --brand-dark:#3730a3; --brand-light:#eef2ff;
  --accent:#0ea5e9; --ink:#111827; --muted:#6b7280; --line:#e5e7eb;
  --bg:#f8fafc; --card:#ffffff; --ok:#16a34a; --warn:#d97706; --err:#dc2626;
  --radius:14px; --shadow:0 1px 3px rgba(17,24,39,.08),0 8px 24px -12px rgba(79,70,229,.18);
  --font:ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--font);color:var(--ink);background:var(--bg);line-height:1.65;-webkit-font-smoothing:antialiased}
img,canvas,video{max-width:100%;height:auto}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:1120px;margin:0 auto;padding:0 20px}
.skip{position:absolute;left:-999px}
/* ---------- header ---------- */
.site-header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50}
.hd-in{display:flex;align-items:center;gap:12px;height:64px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:1.05rem;color:var(--ink);text-decoration:none}
.logo svg{width:32px;height:32px;flex:none}
.logo small{display:block;font-weight:500;font-size:.68rem;color:var(--muted);letter-spacing:.02em}
.nav-toggle{margin-left:auto;background:none;border:1px solid var(--line);border-radius:10px;padding:8px 12px;font-size:1.1rem;cursor:pointer}
.site-nav{display:none;flex-direction:column;gap:2px;padding:0 0 14px}
.site-nav.open{display:flex}
.site-nav a{color:var(--ink);font-weight:600;padding:10px 4px;border-top:1px solid var(--line)}
.site-nav a:hover{color:var(--brand);text-decoration:none}
.site-nav a.active{color:var(--brand)}
@media(min-width:860px){
  .nav-toggle{display:none}
  .site-nav{display:flex!important;flex-direction:row;gap:4px;margin-left:auto;padding:0;align-items:center}
  .site-nav a{border:0;padding:8px 12px;border-radius:10px}
  .site-nav a:hover{background:var(--brand-light)}
}
/* ---------- hero ---------- */
.hero{background:linear-gradient(135deg,#312e81 0%,#4f46e5 55%,#0ea5e9 130%);color:#fff;padding:32px 0 36px;position:relative;overflow:hidden}
.hero::after{content:"";position:absolute;inset:0;background:radial-gradient(600px 200px at 80% 10%,rgba(255,255,255,.14),transparent);pointer-events:none}
.hero h1{font-size:2rem;line-height:1.2;margin:0 0 12px;letter-spacing:-.01em}
.hero p.sub{font-size:1.05rem;opacity:.92;max-width:640px;margin:0 0 24px}
@media(min-width:860px){.hero h1{font-size:2.35rem}.hero{padding:40px 0 44px}}
.badge{display:inline-block;background:#f59e0b;color:#1b1b1b;font-size:.68rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase;padding:2px 8px;border-radius:999px;margin-bottom:6px}
.searchbar{display:flex;gap:8px;max-width:560px;position:relative;z-index:2}
.searchbar input{flex:1;border:0;border-radius:12px;padding:14px 16px;font-size:1rem;box-shadow:0 6px 20px rgba(0,0,0,.25)}
.searchbar input:focus{outline:3px solid rgba(255,255,255,.5)}
.trust{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px;position:relative;z-index:2}
.trust span{background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.25);padding:8px 14px;border-radius:999px;font-size:.88rem;font-weight:600;backdrop-filter:blur(4px)}
/* ---------- sections ---------- */
.section{padding:48px 0}
.section h2{font-size:1.5rem;margin:0 0 6px;letter-spacing:-.01em}
.section .lede{color:var(--muted);margin:0 0 26px;max-width:700px}
/* ---------- grids & cards ---------- */
.grid{display:grid;gap:16px;grid-template-columns:1fr}
@media(min-width:640px){.grid.cols-2{grid-template-columns:repeat(2,1fr)}.grid.cols-3{grid-template-columns:repeat(3,1fr)}}
@media(min-width:960px){.grid.cols-4{grid-template-columns:repeat(4,1fr)}}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow);transition:transform .22s ease,box-shadow .22s ease}
a.card:hover{transform:translateY(-4px);box-shadow:0 12px 32px -12px rgba(79,70,229,.35);text-decoration:none}
.card h3{margin:0 0 8px;font-size:1.06rem;color:var(--ink)}
.card p{margin:0;color:var(--muted);font-size:.94rem}
.tile{display:flex;align-items:center;gap:14px}
.tile-ic{width:46px;height:46px;flex:none;border-radius:12px;display:flex;align-items:center;justify-content:center;background:var(--brand-light)}
.tile-ic svg{width:24px;height:24px}
.cat-pdf{background:#fef2f2}.cat-image{background:#f0fdf4}.cat-video{background:#eff6ff}.cat-util{background:#faf5ff}
.card .go{margin-top:10px;font-weight:700;font-size:.9rem;color:var(--brand)}
/* ---------- tool app ---------- */
.tool-hero{padding:36px 0 8px}
.tool-hero h1{font-size:1.7rem;margin:0 0 8px;letter-spacing:-.01em}
.tool-hero .lede{color:var(--muted);max-width:720px;margin:0}
.breadcrumb{font-size:.85rem;color:var(--muted);margin-bottom:10px}
.tool-app{margin:24px 0;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px}
.drop{border:2px dashed #c7d2fe;background:#f8faff;border-radius:12px;padding:34px 20px;text-align:center;cursor:pointer;transition:.2s}
.drop:hover,.drop.over{border-color:var(--brand);background:var(--brand-light)}
.drop p{margin:6px 0;color:var(--muted);font-size:.94rem}
.drop .big{font-size:1.05rem;font-weight:700;color:var(--ink)}
.btn{display:inline-block;border:0;cursor:pointer;border-radius:12px;padding:13px 26px;font-size:1rem;font-weight:700;background:linear-gradient(135deg,var(--brand),#6d28d9);color:#fff;transition:transform .15s,box-shadow .15s;box-shadow:0 6px 16px -6px rgba(79,70,229,.5)}
.btn:hover{transform:translateY(-2px);box-shadow:0 10px 22px -6px rgba(79,70,229,.6)}
.btn:disabled{opacity:.55;cursor:not-allowed;transform:none}
.btn-ghost{background:#fff;color:var(--brand);border:1.5px solid var(--brand);box-shadow:none}
.btn-sm{padding:8px 16px;font-size:.88rem}
.row{display:flex;flex-wrap:wrap;gap:12px;align-items:center;margin:14px 0}
.field{display:flex;flex-direction:column;gap:6px;font-size:.9rem;font-weight:600}
.field input[type=number],.field input[type=text],.field select,.field textarea{border:1px solid var(--line);border-radius:10px;padding:10px 12px;font-size:1rem;font-family:inherit;background:#fff;color:var(--ink)}
.field input:focus,.field select:focus,.field textarea:focus{outline:2px solid var(--brand);border-color:var(--brand)}
input[type=range]{accent-color:var(--brand)}
.chk{display:flex;gap:8px;align-items:center;font-size:.94rem;font-weight:500}
.progress{height:10px;background:#eef2ff;border-radius:999px;overflow:hidden;margin:14px 0;display:none}
.progress.show{display:block}
.progress i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--brand),var(--accent));border-radius:999px;transition:width .2s}
.status{font-size:.92rem;color:var(--muted);margin:10px 0;min-height:1.4em}
.status.ok{color:var(--ok);font-weight:600}
.status.err{color:var(--err);font-weight:600}
.filelist{list-style:none;margin:12px 0;padding:0;display:flex;flex-direction:column;gap:8px}
.filelist li{display:flex;justify-content:space-between;align-items:center;background:#f8fafc;border:1px solid var(--line);border-radius:10px;padding:8px 12px;font-size:.9rem}
.filelist button{background:none;border:0;color:var(--err);cursor:pointer;font-weight:700}
.hint{font-size:.85rem;color:var(--muted);background:#fffbeb;border:1px solid #fde68a;border-radius:10px;padding:10px 14px;margin:14px 0}
.note{font-size:.85rem;color:var(--muted)}
.divider{border:0;border-top:1px solid var(--line);margin:22px 0}
/* ---------- prose ---------- */
.prose{max-width:780px}
.prose h2{font-size:1.35rem;margin:38px 0 12px;padding-top:8px}
.prose h3{font-size:1.12rem;margin:26px 0 8px}
.prose p,.prose li{color:#374151}
.prose ul,.prose ol{padding-left:22px}
.prose li{margin:6px 0}
.faq details{border:1px solid var(--line);border-radius:12px;margin:10px 0;background:#fff;overflow:hidden}
.faq summary{cursor:pointer;font-weight:700;padding:14px 16px;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";float:right;color:var(--brand);font-size:1.2rem}
.faq details[open] summary::after{content:"–"}
.faq .a{padding:0 16px 16px;color:#374151}
.byline{font-size:.85rem;color:var(--muted);margin-top:28px;border-top:1px solid var(--line);padding-top:14px}
.related{margin-top:26px}
.related .grid{margin-top:12px}
/* ---------- guides ---------- */
.guide-card time{font-size:.82rem;color:var(--muted)}
/* ---------- footer ---------- */
.site-footer{background:#0f172a;color:#cbd5e1;margin-top:64px}
.ft-in{display:grid;gap:28px;padding:44px 0 20px;grid-template-columns:1fr}
@media(min-width:760px){.ft-in{grid-template-columns:1.4fr 1fr 1fr 1fr}}
.site-footer h4{color:#fff;margin:0 0 12px;font-size:.95rem}
.site-footer a{color:#cbd5e1;font-size:.92rem;display:block;margin:7px 0}
.site-footer a:hover{color:#fff}
.ft-brand p{font-size:.9rem;color:#94a3b8}
.ft-bottom{border-top:1px solid #1e293b;padding:16px 0 26px;font-size:.84rem;color:#64748b;display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between}
/* ---------- reveal animation ---------- */
.reveal{opacity:0;transform:translateY(18px)}
.reveal.visible{opacity:1;transform:none;transition:opacity .55s ease,transform .55s ease}
@media(prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}}
/* ---------- contact form ---------- */
.form-grid{display:grid;gap:14px;max-width:560px}
.form-grid label{font-weight:600;font-size:.92rem;display:flex;flex-direction:column;gap:6px}
.form-grid input,.form-grid textarea,.form-grid select{border:1px solid var(--line);border-radius:10px;padding:12px;font-size:1rem;font-family:inherit}
.form-grid input:focus,.form-grid textarea:focus{outline:2px solid var(--brand)}