/* ===================================================================
   Idiot Date Tools — Design System
   Palette: Indigo/Slate SaaS
   =================================================================== */
:root{
  --ink:#0f172a;          /* slate-900 */
  --ink-soft:#475569;     /* slate-600 */
  --line:#e2e8f0;         /* slate-200 */
  --surface:#ffffff;
  --surface-alt:#f8fafc;  /* slate-50 */
  --indigo:#4f46e5;       /* indigo-600 */
  --indigo-deep:#3730a3;  /* indigo-800 */
  --indigo-soft:#eef2ff;  /* indigo-50 */
  --amber:#f59e0b;        /* accent for "today" marker */
  --radius:14px;
  --radius-sm:8px;
  --shadow-sm:0 1px 2px rgba(15,23,42,.06);
  --shadow-md:0 8px 24px rgba(15,23,42,.08);
  --shadow-lg:0 20px 48px rgba(15,23,42,.14);
  --mono:'JetBrains Mono','SF Mono',Consolas,monospace;
  --sans:'Inter',system-ui,-apple-system,sans-serif;
  --display:'Sora',var(--sans);
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:var(--sans);
  color:var(--ink);
  background:var(--surface-alt);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{font-family:var(--display);letter-spacing:-0.01em;margin:0 0 .5em;color:var(--ink);}
a{color:var(--indigo);text-decoration:none;}
a:hover{text-decoration:underline;}
img{max-width:100%;}
.container{max-width:1180px;margin:0 auto;padding:0 24px;}
:focus-visible{outline:3px solid var(--indigo);outline-offset:2px;}
@media (prefers-reduced-motion: reduce){*{animation:none !important;transition:none !important;}}

/* ---------- Date-strip signature element ---------- */
.datestrip{
  background:var(--ink);
  color:#cbd5e1;
  font-family:var(--mono);
  font-size:12.5px;
  letter-spacing:.04em;
  overflow:hidden;
  white-space:nowrap;
  padding:6px 0;
}
.datestrip .container{display:flex;gap:28px;align-items:center;}
.datestrip .dot{color:var(--amber);}
.datestrip span{opacity:.9}

/* ---------- Header / Nav ---------- */
header.site-header{
  background:var(--surface);
  border-bottom:1px solid var(--line);
  position:sticky;top:0;z-index:50;
}
.nav-row{display:flex;align-items:center;justify-content:space-between;padding:14px 0;gap:20px;}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--display);font-weight:700;font-size:19px;color:var(--ink);}
.brand .mark{
  width:34px;height:34px;border-radius:9px;
  background:linear-gradient(145deg,var(--indigo),var(--indigo-deep));
  color:#fff;display:flex;align-items:center;justify-content:center;
  font-family:var(--mono);font-weight:700;font-size:13px;
}
nav.main-nav{display:flex;gap:22px;align-items:center;}
nav.main-nav a{color:var(--ink-soft);font-size:14.5px;font-weight:500;}
nav.main-nav a:hover{color:var(--indigo);text-decoration:none;}

.search-wrap{position:relative;width:100%;max-width:340px;}
.search-wrap input{
  width:100%;padding:10px 14px 10px 38px;border-radius:999px;
  border:1px solid var(--line);background:var(--surface-alt);font-size:14px;color:var(--ink);
}
.search-wrap input:focus{background:#fff;border-color:var(--indigo);}
.search-wrap svg{position:absolute;left:13px;top:50%;transform:translateY(-50%);opacity:.5;}
.search-results{
  position:absolute;top:calc(100% + 8px);left:0;right:0;
  background:#fff;border:1px solid var(--line);border-radius:var(--radius-sm);
  box-shadow:var(--shadow-lg);max-height:340px;overflow-y:auto;display:none;z-index:60;
}
.search-results.active{display:block;}
.search-results a{display:block;padding:10px 14px;color:var(--ink);font-size:14px;border-bottom:1px solid var(--line);}
.search-results a:last-child{border-bottom:none;}
.search-results a:hover{background:var(--indigo-soft);text-decoration:none;}
.search-results .cat{color:var(--ink-soft);font-size:11.5px;text-transform:uppercase;letter-spacing:.05em;}
.search-empty{padding:14px;color:var(--ink-soft);font-size:14px;}

.mobile-toggle{display:none;background:none;border:none;cursor:pointer;padding:6px;}

/* ---------- Hero ---------- */
.hero{
  background:radial-gradient(1200px 420px at 15% -10%, var(--indigo-soft), transparent),var(--surface);
  padding:64px 0 48px;border-bottom:1px solid var(--line);
}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;font-family:var(--mono);font-size:12px;
  color:var(--indigo-deep);background:var(--indigo-soft);padding:6px 12px;border-radius:999px;margin-bottom:18px;
}
.hero h1{font-size:42px;max-width:720px;}
.hero p.lead{font-size:17px;color:var(--ink-soft);max-width:640px;}

/* ---------- Cards / Grid ---------- */
.section{padding:52px 0;}
.section-head{display:flex;align-items:baseline;justify-content:space-between;gap:12px;margin-bottom:26px;flex-wrap:wrap;}
.section-head h2{font-size:26px;}
.section-head p{color:var(--ink-soft);margin:0;}

.cat-badge{
  font-family:var(--mono);font-size:11px;text-transform:uppercase;letter-spacing:.06em;
  color:var(--indigo-deep);background:var(--indigo-soft);padding:3px 9px;border-radius:6px;display:inline-block;
}

.tools-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(270px,1fr));gap:18px;}
.tool-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:22px;display:flex;flex-direction:column;gap:10px;transition:transform .15s ease, box-shadow .15s ease, border-color .15s ease;
}
.tool-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-md);border-color:#c7d2fe;}
.tool-card .icon{
  width:42px;height:42px;border-radius:10px;background:var(--indigo-soft);color:var(--indigo-deep);
  display:flex;align-items:center;justify-content:center;font-family:var(--mono);font-weight:700;
}
.tool-card h3{font-size:17px;margin-bottom:2px;}
.tool-card p{color:var(--ink-soft);font-size:14px;margin:0;flex-grow:1;}
.tool-card .go{font-size:13.5px;font-weight:600;color:var(--indigo);}

/* ---------- Tool page layout ---------- */
.tool-hero{background:var(--surface);border-bottom:1px solid var(--line);padding:40px 0 34px;}
.breadcrumb{font-size:13px;color:var(--ink-soft);margin-bottom:14px;}
.breadcrumb a{color:var(--ink-soft);}
.tool-hero h1{font-size:32px;margin-bottom:8px;}
.tool-hero p.lead{color:var(--ink-soft);max-width:680px;font-size:15.5px;}

.tool-app{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:28px;box-shadow:var(--shadow-sm);margin:-18px auto 0;max-width:820px;
}
.field-row{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-bottom:16px;}
@media(max-width:560px){.field-row{grid-template-columns:1fr;}}
.field{display:flex;flex-direction:column;gap:6px;}
.field label{font-size:13px;font-weight:600;color:var(--ink-soft);}
.field input, .field select{
  padding:11px 13px;border:1px solid var(--line);border-radius:var(--radius-sm);font-size:15px;
  font-family:var(--sans);background:var(--surface-alt);color:var(--ink);
}
.field input:focus, .field select:focus{background:#fff;border-color:var(--indigo);}
.btn{
  appearance:none;border:none;cursor:pointer;font-family:var(--sans);font-weight:600;font-size:15px;
  padding:12px 22px;border-radius:999px;background:var(--indigo);color:#fff;transition:background .15s ease;
}
.btn:hover{background:var(--indigo-deep);}
.btn.secondary{background:var(--surface-alt);color:var(--ink);border:1px solid var(--line);}
.btn.secondary:hover{background:#eef1f6;}
.actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:6px;}

.result-box{
  margin-top:22px;padding:20px;border-radius:var(--radius-sm);background:var(--indigo-soft);
  border:1px solid #c7d2fe;display:none;
}
.result-box.active{display:block;}
.result-box .big{font-family:var(--display);font-size:30px;font-weight:700;color:var(--indigo-deep);}
.result-box .small{color:var(--ink-soft);font-size:13.5px;margin-top:4px;}
.result-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(110px,1fr));gap:12px;margin-top:14px;}
.result-grid .cell{background:#fff;border-radius:8px;padding:10px 12px;text-align:center;border:1px solid var(--line);}
.result-grid .cell .n{font-family:var(--mono);font-size:20px;font-weight:700;color:var(--indigo-deep);}
.result-grid .cell .l{font-size:11.5px;color:var(--ink-soft);text-transform:uppercase;letter-spacing:.04em;}

table.mini{width:100%;border-collapse:collapse;margin-top:14px;font-size:14px;}
table.mini th, table.mini td{border:1px solid var(--line);padding:8px 10px;text-align:center;}
table.mini th{background:var(--surface-alt);font-family:var(--mono);font-size:12px;text-transform:uppercase;color:var(--ink-soft);}

.cal-grid{display:grid;grid-template-columns:repeat(7,1fr);gap:4px;margin-top:16px;}
.cal-grid .dow{font-size:11px;color:var(--ink-soft);text-align:center;font-family:var(--mono);padding:4px 0;}
.cal-grid .day{aspect-ratio:1;display:flex;align-items:center;justify-content:center;border-radius:8px;background:var(--surface-alt);font-size:13.5px;border:1px solid var(--line);}
.cal-grid .day.blank{background:transparent;border:none;}
.cal-grid .day.today{background:var(--indigo);color:#fff;font-weight:700;border-color:var(--indigo);}

/* ---------- Content / FAQ ---------- */
.content-block{max-width:820px;margin:0 auto;}
.content-block h2{font-size:22px;margin-top:38px;}
.content-block p{color:var(--ink-soft);font-size:15.5px;}
.faq-item{border-bottom:1px solid var(--line);padding:16px 0;}
.faq-item summary{cursor:pointer;font-weight:600;font-size:15.5px;list-style:none;display:flex;justify-content:space-between;align-items:center;}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary::after{content:'+';font-size:20px;color:var(--indigo);}
.faq-item[open] summary::after{content:'\2212';}
.faq-item p{margin:10px 0 0;color:var(--ink-soft);}

/* ---------- Related tools ---------- */
.related-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:14px;margin-top:16px;}

/* ---------- Footer ---------- */
footer.site-footer{background:var(--ink);color:#cbd5e1;padding:48px 0 24px;margin-top:40px;}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px;}
@media(max-width:760px){.footer-grid{grid-template-columns:1fr 1fr;}}
.footer-grid h4{color:#fff;font-size:14px;text-transform:uppercase;letter-spacing:.05em;margin-bottom:14px;}
.footer-grid a{color:#94a3b8;font-size:14px;display:block;margin-bottom:9px;}
.footer-grid a:hover{color:#fff;text-decoration:none;}
.footer-brand p{color:#94a3b8;font-size:14px;max-width:320px;}
.footer-bottom{border-top:1px solid #1e293b;margin-top:32px;padding-top:20px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;font-size:13px;color:#64748b;}

/* ---------- Static pages ---------- */
.static-page{padding:48px 0 64px;}
.static-page h1{font-size:32px;}
.static-page .content-block h2{font-size:20px;}

/* ---------- Responsive ---------- */
@media(max-width:780px){
  nav.main-nav{display:none;}
  .mobile-toggle{display:block;}
  .search-wrap{max-width:none;flex:1;}
  .nav-row{flex-wrap:wrap;}
  .hero h1{font-size:30px;}
  nav.main-nav.open{
    display:flex;flex-direction:column;position:absolute;top:100%;left:0;right:0;
    background:#fff;border-bottom:1px solid var(--line);padding:14px 24px;gap:14px;
  }
}