/* ToolNest — Design System (mobile-first, zero-dependency, fast) */
:root{
  --bg:#f5f7fb; --card:#ffffff; --ink:#161c2d; --muted:#5b6478;
  --line:#e6eaf2; --brand:#4f46e5; --brand2:#0d9488; --grad:linear-gradient(135deg,#4f46e5,#0d9488);
  --ok:#0a8a4a; --warn:#b45309; --bad:#c92a2a; --radius:16px;
  --shadow:0 1px 2px rgba(22,28,45,.06),0 8px 24px rgba(22,28,45,.07);
}
@media (prefers-color-scheme:dark){
  :root{ --bg:#0f1420; --card:#171e2e; --ink:#e8ecf6; --muted:#9aa4bd; --line:#26304a; --shadow:0 1px 2px rgba(0,0,0,.4),0 8px 24px rgba(0,0,0,.35); }
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;background:var(--bg);color:var(--ink);line-height:1.6;font-size:16px;-webkit-text-size-adjust:100%}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
img,canvas,svg{max-width:100%}
.container{max-width:980px;margin:0 auto;padding:0 16px}
/* Header */
.site-header{position:sticky;top:0;z-index:50;background:color-mix(in srgb,var(--card) 88%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.site-header .inner{display:flex;align-items:center;justify-content:space-between;height:60px}
.logo{display:flex;align-items:center;gap:9px;font-weight:800;font-size:18px;color:var(--ink)}
.logo .mark{width:30px;height:30px;border-radius:9px;background:var(--grad);display:grid;place-items:center;color:#fff;font-size:15px;font-weight:900}
.logo:hover{text-decoration:none}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:var(--grad);color:#fff;border:0;border-radius:12px;padding:12px 20px;font-size:15px;font-weight:700;cursor:pointer;min-height:46px;transition:transform .06s ease,opacity .15s}
.btn:hover{opacity:.92;text-decoration:none}
.btn:active{transform:scale(.98)}
.btn.secondary{background:transparent;color:var(--brand);border:2px solid var(--brand)}
.btn.small{padding:8px 14px;min-height:38px;font-size:13.5px;border-radius:10px}
/* Hero */
.hero{padding:34px 0 10px;text-align:center}
.hero h1{font-size:clamp(24px,5vw,38px);line-height:1.2;letter-spacing:-.5px}
.hero h1 .grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p{color:var(--muted);max-width:640px;margin:10px auto 0;font-size:16.5px}
/* Cards & grid */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px}
.grid{display:grid;gap:14px}
@media(min-width:640px){.grid.c2{grid-template-columns:1fr 1fr}.grid.c3{grid-template-columns:repeat(3,1fr)}}
.tool-card{display:block;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px;transition:transform .08s,box-shadow .15s;color:var(--ink)}
.tool-card:hover{transform:translateY(-2px);box-shadow:var(--shadow);text-decoration:none}
.tool-card .ico{font-size:24px}
.tool-card h3{font-size:16px;margin:6px 0 4px}
.tool-card p{font-size:13.5px;color:var(--muted);line-height:1.45}
.badge{display:inline-block;font-size:11px;font-weight:700;letter-spacing:.4px;text-transform:uppercase;background:color-mix(in srgb,var(--brand) 12%,transparent);color:var(--brand);border-radius:999px;padding:3px 10px;margin-bottom:8px}
/* Tool page */
.tool-wrap{max-width:720px;margin:0 auto}
.crumbs{font-size:13px;color:var(--muted);margin:18px 0 10px}
.crumbs a{color:var(--muted)}
h1.tool-title{font-size:clamp(22px,4.5vw,30px);letter-spacing:-.4px;margin-bottom:6px}
.tool-sub{color:var(--muted);margin-bottom:18px;font-size:15px}
label{display:block;font-weight:600;font-size:14px;margin:14px 0 6px}
input[type=text],input[type=number],input[type=date],input[type=file],select,textarea{width:100%;background:var(--bg);border:1.5px solid var(--line);border-radius:12px;padding:12px 14px;font-size:16px;color:var(--ink);font-family:inherit;transition:border .15s}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--brand)}
textarea{min-height:140px;resize:vertical}
.row{display:flex;gap:12px;flex-wrap:wrap}
.row>*{flex:1;min-width:140px}
.hint{font-size:12.5px;color:var(--muted);margin-top:5px}
.results{margin-top:18px;display:none}
.results.show{display:block}
.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:10px;margin-top:12px}
.stat{background:var(--bg);border:1px solid var(--line);border-radius:12px;padding:12px;text-align:center}
.stat b{display:block;font-size:20px;letter-spacing:-.4px}
.stat span{font-size:12px;color:var(--muted)}
.stat.big b{font-size:30px;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.verdict{border-radius:12px;padding:14px 16px;font-weight:700;margin-top:12px}
.verdict.ok{background:color-mix(in srgb,var(--ok) 12%,transparent);color:var(--ok)}
.verdict.warn{background:color-mix(in srgb,var(--warn) 14%,transparent);color:var(--warn)}
.verdict.bad{background:color-mix(in srgb,var(--bad) 10%,transparent);color:var(--bad)}
.check-list{list-style:none;margin-top:10px}
.check-list li{padding:8px 10px;border-radius:10px;margin-bottom:6px;font-size:14px;background:var(--bg);border:1px solid var(--line)}
.check-list li.ok{border-left:4px solid var(--ok)}
.check-list li.bad{border-left:4px solid var(--bad)}
/* Sections */
.section{margin:34px 0}
.section h2{font-size:20px;letter-spacing:-.3px;margin-bottom:10px}
.section p{color:var(--muted);font-size:15px}
.steps{counter-reset:st;list-style:none;margin:12px 0}
.steps li{counter-increment:st;position:relative;padding:10px 0 10px 44px;font-size:15px}
.steps li:before{content:counter(st);position:absolute;left:0;top:8px;width:30px;height:30px;border-radius:9px;background:var(--grad);color:#fff;font-weight:800;display:grid;place-items:center;font-size:14px}
/* FAQ */
details{background:var(--card);border:1px solid var(--line);border-radius:12px;margin-bottom:10px;overflow:hidden}
details summary{cursor:pointer;font-weight:700;padding:14px 16px;font-size:15px;list-style:none;display:flex;justify-content:space-between;align-items:center}
details summary::-webkit-details-marker{display:none}
details summary:after{content:"+";font-size:20px;color:var(--muted)}
details[open] summary:after{content:"–"}
details .faq-body{padding:0 16px 14px;color:var(--muted);font-size:14.5px}
/* Toast */
#toast{position:fixed;left:50%;bottom:24px;transform:translateX(-50%) translateY(80px);background:var(--ink);color:var(--bg);padding:11px 20px;border-radius:12px;font-size:14px;font-weight:600;opacity:0;transition:all .25s;z-index:99;pointer-events:none;max-width:90vw}
#toast.show{transform:translateX(-50%) translateY(0);opacity:1}
/* Footer */
.site-footer{margin-top:56px;border-top:1px solid var(--line);background:var(--card);padding:38px 0 26px}
.foot-top{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:30px;align-items:start}
.foot-brand .logo{font-size:20px}
.foot-tag{font-size:14px;color:var(--muted);line-height:1.55;margin:10px 0 12px;max-width:34ch}
.foot-chips{display:flex;flex-wrap:wrap;gap:6px}
.foot-chips span{font-size:12px;font-weight:600;color:var(--muted);border:1px solid var(--line);border-radius:999px;padding:5px 10px;background:var(--bg)}
.foot-col h4,.foot-cats h4{font-size:12.5px;text-transform:uppercase;letter-spacing:.8px;color:var(--muted);margin-bottom:10px}
.foot-col a{display:block;font-size:14px;color:var(--ink);padding:4px 0;opacity:.9}
.foot-col a:hover{opacity:1;color:var(--brand)}
.foot-cats{margin-top:30px;padding-top:18px;border-top:1px solid var(--line)}
.foot-cat-links{display:flex;flex-wrap:wrap;gap:8px}
.foot-cat-chip{font-size:13px;font-weight:600;color:var(--ink);background:var(--bg);border:1px solid var(--line);border-radius:999px;padding:7px 13px;opacity:.92}
.foot-cat-chip:hover{border-color:var(--brand);color:var(--brand);opacity:1}
.foot-legal{display:flex;flex-wrap:wrap;gap:8px 22px;justify-content:space-between;margin-top:24px;padding-top:16px;border-top:1px solid var(--line);font-size:12.5px;color:var(--muted)}
.foot-legal a{color:var(--muted)}
@media (max-width:900px){.foot-top{grid-template-columns:1fr 1fr}.foot-brand{grid-column:1/-1}}
@media (max-width:560px){.foot-top{grid-template-columns:1fr}.foot-legal{flex-direction:column;gap:6px}}
/* misc */
.pill-row{display:flex;gap:8px;flex-wrap:wrap;margin:14px 0}
.pill{font-size:13px;border:1.5px solid var(--line);border-radius:999px;padding:7px 14px;background:var(--card);cursor:pointer;font-weight:600}
.pill.active{background:var(--grad);color:#fff;border-color:transparent}
canvas.output{background:#fff;border:1px solid var(--line);border-radius:12px;margin-top:12px}
.thumb-grid{display:grid;gap:12px;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));margin-top:12px}
.thumb-card{background:var(--bg);border:1px solid var(--line);border-radius:12px;padding:10px;text-align:center}
.thumb-card img{border-radius:8px;width:100%}
.thumb-card .t-label{font-size:12px;font-weight:700;margin:6px 0}
.dropzone{border:2px dashed color-mix(in srgb,var(--brand) 40%,var(--line));border-radius:14px;padding:28px 16px;text-align:center;color:var(--muted);cursor:pointer;transition:border .15s,background .15s}
.dropzone:hover,.dropzone.drag{border-color:var(--brand);background:color-mix(in srgb,var(--brand) 5%,transparent)}
.file-chip{display:inline-flex;align-items:center;gap:6px;background:var(--bg);border:1px solid var(--line);border-radius:999px;padding:6px 12px;font-size:13px;margin:4px 4px 0 0}
.progress{height:8px;background:var(--line);border-radius:99px;overflow:hidden;margin-top:8px}
.progress>div{height:100%;width:0;background:var(--grad);transition:width .2s}

/* ===== v2 header: sticky + instant search + dropdown + hamburger ===== */
.site-header{position:sticky;top:0;z-index:50;background:color-mix(in srgb,var(--card) 88%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.site-header .inner{display:flex;align-items:center;gap:14px;padding-top:10px;padding-bottom:10px}
.hdr-search{flex:1;max-width:440px;margin-inline:auto}
.tf-search{position:relative;display:flex;align-items:center}
.tf-search input{width:100%;padding:9px 64px 9px 36px;border:1.5px solid var(--line);border-radius:999px;background:var(--bg);font-size:14px;transition:border .15s, box-shadow .15s}
.tf-search input:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px color-mix(in srgb,var(--brand) 18%,transparent)}
.tf-search .tf-ico{position:absolute;left:12px;font-size:14px;pointer-events:none}
.tf-kbd{position:absolute;right:38px;font-size:11px;color:var(--muted);border:1px solid var(--line);border-radius:6px;padding:1px 6px;background:var(--card);display:none}
@media(min-width:861px){.tf-kbd{display:block}}
.tf-clear{position:absolute;right:10px;border:0;background:transparent;font-size:12px;color:var(--muted);cursor:pointer;padding:4px}
.tf-results{position:absolute;top:calc(100% + 8px);left:0;right:0;background:var(--card);border:1px solid var(--line);border-radius:14px;box-shadow:0 12px 32px rgba(2,8,23,.14);max-height:min(430px,70vh);overflow:auto;z-index:80}
.tf-r{display:flex;gap:10px;align-items:center;padding:10px 12px;border-bottom:1px solid var(--line);text-decoration:none}
.tf-r:last-of-type{border-bottom:0}
.tf-r:hover,.tf-r.act{background:color-mix(in srgb,var(--brand) 7%,transparent)}
.tf-r-ico{font-size:18px;flex:0 0 24px;text-align:center}
.tf-r-main{min-width:0;flex:1;display:flex;flex-direction:column}
.tf-r-name{font-size:14px;font-weight:700;color:var(--ink);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.tf-r-name b,.tf-r-desc b{color:var(--brand)}
.tf-r-desc{font-size:12px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.tf-r-cat{flex:0 0 auto;font-size:10.5px;text-transform:uppercase;letter-spacing:.5px;color:var(--muted);border:1px solid var(--line);border-radius:999px;padding:2px 8px}
.tf-empty,.tf-foot{padding:12px 14px;font-size:12.5px;color:var(--muted)}
.tf-foot{border-top:1px solid var(--line)}
.hero-search{max-width:560px;margin:0 auto}
.hero-search .tf-search input{padding:13px 44px 13px 42px;font-size:15.5px;border-radius:14px;text-align:left}
.hero-search .tf-ico{left:16px;font-size:16px}
.main-nav{display:flex;align-items:center;gap:4px}
.nav-btn{display:inline-flex;align-items:center;gap:5px;font-size:14px;font-weight:600;color:var(--ink);background:transparent;border:0;border-radius:10px;padding:9px 12px;cursor:pointer;text-decoration:none}
.nav-btn:hover{background:var(--bg)}
.nav-drop{position:relative}
.chev{font-size:11px;transition:transform .15s}
.nav-drop.open .chev{transform:rotate(180deg)}
.nav-menu{display:none;position:absolute;top:calc(100% + 8px);left:0;background:var(--card);border:1px solid var(--line);border-radius:14px;box-shadow:0 12px 32px rgba(2,8,23,.14);padding:8px;min-width:230px;z-index:70}
.nav-menu a{display:flex;align-items:center;gap:8px;font-size:14px;padding:9px 10px;border-radius:9px;color:var(--ink);text-decoration:none}
.nav-menu a:hover{background:var(--bg)}
.nav-drop.open .nav-menu{display:block}
.hamburger{display:none;border:1.5px solid var(--line);background:var(--card);border-radius:10px;font-size:17px;padding:6px 11px;cursor:pointer}
.mobile-panel{display:none;border-top:1px solid var(--line);background:var(--card);padding:12px 0 16px}
.mobile-panel .panel-search{padding:0 14px 10px}
.panel-links{display:grid;grid-template-columns:1fr 1fr;gap:4px;padding:0 14px}
.panel-links a{font-size:14.5px;padding:10px 8px;border-radius:9px;color:var(--ink);text-decoration:none}
.panel-links a:active{background:var(--bg)}
@media(max-width:860px){
  .main-nav{display:none}
  .hamburger{display:inline-block}
  body.nav-open .mobile-panel{display:block}
  .hdr-search{margin-inline:0}
}
@media(max-width:560px){.panel-links{grid-template-columns:1fr}}