/* GigFinance Tools — shared stylesheet. Mobile-first, no external fonts. */
:root{
  --accent:#0e7490;
  --accent-dark:#0b5f76;
  --accent-light:#e0f2f7;
  --ink:#1e293b;
  --muted:#64748b;
  --bg:#f6f9fb;
  --card:#ffffff;
  --border:#e2e8f0;
  --radius:12px;
  --shadow:0 1px 3px rgba(15,40,55,.08),0 4px 14px rgba(15,40,55,.06);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;color:var(--ink);background:var(--bg);line-height:1.65;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
}
h1,h2,h3{line-height:1.3;margin:0 0 .6em}
h1{font-size:1.9rem}
h2{font-size:1.35rem;margin-top:1.6em}
h3{font-size:1.1rem}
p{margin:0 0 1em}
a{color:var(--accent)}
img{max-width:100%}
.container{max-width:1080px;margin:0 auto;padding:0 1rem}
.lede{font-size:1.08rem;color:var(--muted);max-width:44em}

/* ---------- header ---------- */
.site-header{position:sticky;top:0;z-index:50;background:#fff;border-bottom:1px solid var(--border)}
.header-inner{max-width:1080px;margin:0 auto;padding:.6rem 1rem;display:flex;align-items:center;gap:1rem;flex-wrap:wrap}
.brand{font-weight:800;font-size:1.15rem;color:var(--accent);text-decoration:none;white-space:nowrap}
.brand small{color:var(--muted);font-weight:600}
.nav{display:flex;gap:.15rem;align-items:center;flex-wrap:wrap;flex:1}
.nav a{padding:.45rem .65rem;border-radius:8px;text-decoration:none;color:var(--ink);font-size:.9rem;white-space:nowrap}
.nav a:hover{background:#eef4f6}
.nav a.active{background:var(--accent);color:#fff}
.lang-switch{display:flex;gap:.2rem;align-items:center;font-size:.85rem;margin-left:auto}
.lang-switch a{padding:.3rem .55rem;border-radius:6px;text-decoration:none;color:var(--muted);border:1px solid transparent}
.lang-switch a:hover{border-color:var(--border)}
.lang-switch a.current{background:var(--ink);color:#fff}
.menu-toggle{display:none;background:none;border:1px solid var(--border);border-radius:8px;padding:.4rem .7rem;font-size:1rem;cursor:pointer}

/* ---------- hero ---------- */
.hero{background:linear-gradient(135deg,#0e7490 0%,#155e75 100%);color:#fff;padding:3.2rem 1rem;text-align:center}
.hero h1{font-size:2.1rem;margin-bottom:.4em}
.hero p{color:#d7e9ee;max-width:40em;margin:0 auto 1.4em}
.btn{display:inline-block;background:#fff;color:var(--accent-dark);font-weight:700;padding:.7rem 1.5rem;border-radius:10px;text-decoration:none;border:0;cursor:pointer;font-size:1rem}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:var(--accent-dark)}
.btn-ghost{background:transparent;color:#fff;border:2px solid #fff}

/* ---------- cards / tool grid ---------- */
.grid{display:grid;gap:1rem;grid-template-columns:1fr;margin:1.5rem 0}
@media(min-width:640px){.grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:960px){.grid{grid-template-columns:repeat(3,1fr)}}
.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:1.4rem;display:flex;flex-direction:column}
.card h3{margin-top:0}
.card h3 a{color:var(--ink);text-decoration:none}
.card h3 a:hover{color:var(--accent)}
.card p{color:var(--muted);font-size:.95rem;flex:1}
.card .go{font-weight:700;text-decoration:none}

/* ---------- calculator ---------- */
.calc{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:1.5rem;margin:1.5rem 0}
.field{margin-bottom:1rem}
.field label{display:block;font-weight:600;margin-bottom:.35rem}
.field input[type=number],.field input[type=text],.field input[type=date],.field input[type=email],.field textarea,.field select{
  width:100%;padding:.65rem .8rem;border:1px solid var(--border);border-radius:8px;font-size:1rem;font-family:inherit;background:#fff}
.field input:focus,.field textarea:focus,.field select:focus{outline:2px solid var(--accent-light);border-color:var(--accent)}
.radio-row{display:flex;gap:1.2rem;flex-wrap:wrap}
.radio-row label{font-weight:400;display:flex;gap:.4rem;align-items:center}
.hint{font-size:.85rem;color:var(--muted)}
.results{background:#f0f9fb;border:1px solid #bfe3ec;border-radius:var(--radius);padding:1.25rem;margin-top:1.25rem}
.results h3{margin-top:0;color:var(--accent-dark)}
.result-row{display:flex;justify-content:space-between;gap:1rem;padding:.45rem 0;border-bottom:1px dashed var(--border);font-size:.97rem}
.result-row:last-child{border-bottom:0}
.result-row.total{font-weight:800;font-size:1.12rem;color:var(--accent-dark)}
.result-row .val{font-variant-numeric:tabular-nums;white-space:nowrap}
.disclaimer{background:#fff8e6;border:1px solid #f0d98c;border-radius:var(--radius);padding:1rem 1.2rem;margin:1.5rem 0;font-size:.92rem}

/* ---------- guide / faq ---------- */
.guide{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:1.5rem;margin:1.5rem 0}
details{border:1px solid var(--border);border-radius:8px;margin-bottom:.6rem;background:#fff}
summary{cursor:pointer;font-weight:600;padding:.8rem 1rem;list-style:none}
summary::-webkit-details-marker{display:none}
summary::before{content:"+ ";color:var(--accent);font-weight:800}
details[open] summary::before{content:"– "}
details .a{padding:0 1rem 1rem;color:var(--muted)}

/* ---------- tables ---------- */
table{width:100%;border-collapse:collapse;margin:1rem 0;font-size:.95rem;background:#fff}
th,td{padding:.6rem .8rem;border:1px solid var(--border);text-align:left}
th{background:#eef4f6}

/* ---------- footer ---------- */
.site-footer{background:#0f2a33;color:#cbd5e1;margin-top:3rem}
.footer-inner{max-width:1080px;margin:0 auto;padding:2.5rem 1rem 1rem;display:grid;gap:2rem;grid-template-columns:1fr}
@media(min-width:760px){.footer-inner{grid-template-columns:2fr 1fr 1fr}}
.site-footer h4{color:#fff;margin:0 0 .7em;font-size:1rem}
.site-footer a{color:#9fd4e0;text-decoration:none;font-size:.93rem}
.site-footer a:hover{text-decoration:underline}
.site-footer ul{list-style:none;margin:0;padding:0}
.site-footer li{margin-bottom:.4rem}
.footer-bottom{max-width:1080px;margin:0 auto;padding:1rem;border-top:1px solid #1e3a44;font-size:.82rem;color:#7d93a0;display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap}

/* ---------- invoice ---------- */
.inv-grid{display:grid;gap:1rem;grid-template-columns:1fr}
@media(min-width:900px){.inv-grid{grid-template-columns:1fr 1fr}}
#invoice-sheet{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:2rem;box-shadow:var(--shadow)}
.inv-head{display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap;border-bottom:3px solid var(--accent);padding-bottom:1rem;margin-bottom:1rem}
.inv-head h2{margin:0;color:var(--accent-dark)}
.inv-meta{text-align:right;font-size:.9rem;color:var(--muted)}
.inv-parties{display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap;margin-bottom:1rem;font-size:.93rem}
.line-item{display:grid;grid-template-columns:1fr 64px 90px 90px 28px;gap:.5rem;margin-bottom:.5rem;align-items:center}
.line-item input{width:100%;padding:.5rem;border:1px solid var(--border);border-radius:6px;font-size:.92rem}
.rm-btn{background:#fee2e2;border:0;border-radius:6px;cursor:pointer;font-size:1rem;line-height:1;padding:.45rem}

/* ---------- print (invoice) ---------- */
@media print{
  .site-header,.site-footer,.no-print,.guide,.disclaimer,.hero{display:none !important}
  body{background:#fff}
  .container{max-width:100%;padding:0}
  #invoice-sheet{box-shadow:none;border:0;border-radius:0;margin:0;max-width:100%}
}

/* ---------- misc ---------- */
.section{margin:2.5rem 0}
.two-col{display:grid;gap:1.5rem;grid-template-columns:1fr}
@media(min-width:800px){.two-col{grid-template-columns:1fr 1fr}}
.check li{margin-bottom:.5rem}
ul.check{list-style:none;padding:0}
ul.check li::before{content:"✓ ";color:var(--accent);font-weight:800}
.badge{display:inline-block;background:var(--accent-light);color:var(--accent-dark);font-size:.78rem;font-weight:700;padding:.2rem .6rem;border-radius:999px;margin-bottom:.6rem}

@media(max-width:760px){
  .menu-toggle{display:block}
  .nav{display:none;width:100%;flex-direction:column;align-items:stretch}
  .nav.open{display:flex}
  .nav a{padding:.6rem .4rem;border-bottom:1px solid var(--border)}
  h1{font-size:1.6rem}
  .hero h1{font-size:1.7rem}
  .line-item{grid-template-columns:1fr 56px 80px 80px 28px}
}