/* =========================
   CalcHub Theme (HTML+CSS)
   ========================= */

:root{
  --bg: #0b0f19;
  --surface: rgba(255,255,255,.06);
  --surface-2: rgba(255,255,255,.09);
  --text: rgba(255,255,255,.92);
  --muted: rgba(255,255,255,.68);
  --border: rgba(255,255,255,.12);

  --primary: #7c5cff;
  --primary-2: #a08cff;

  --good: #34d399;
  --warn: #fbbf24;

  --shadow: 0 18px 60px rgba(0,0,0,.45);
  --radius: 16px;
  --radius-lg: 22px;

  --container: 1120px;
  --gap: 18px;

  --font: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial;
}

/* Light mode if user prefers */
@media (prefers-color-scheme: light) {
  :root{
    --bg: #f7f8fc;
    --surface: rgba(10, 18, 38, .05);
    --surface-2: rgba(10, 18, 38, .08);
    --text: rgba(10, 18, 38, .92);
    --muted: rgba(10, 18, 38, .64);
    --border: rgba(10, 18, 38, .12);

    --shadow: 0 18px 60px rgba(10,18,38,.12);
  }
}

*{ box-sizing:border-box; }
html,body{ height:100%; }
body{
  margin:0;
  font-family: var(--font);
  background: radial-gradient(1200px 800px at 20% -10%, rgba(124,92,255,.35), transparent 55%),
              radial-gradient(900px 700px at 85% 10%, rgba(52,211,153,.18), transparent 60%),
              var(--bg);
  color: var(--text);
  line-height: 1.4;
}

a{ color: inherit; text-decoration: none; }
a:hover{ text-decoration: underline; }

.container{
  width: min(100% - 32px, var(--container));
  margin-inline: auto;
}

.skip-link{
  position:absolute;
  left:-999px;
  top:0;
  background: var(--primary);
  color:#fff;
  padding:10px 12px;
  border-radius: 10px;
  z-index: 9999;
}
.skip-link:focus{ left: 12px; top: 12px; }

/* Header */
.site-header{
  position: sticky;
  top:0;
  z-index: 50;
  backdrop-filter: blur(10px);
  background: color-mix(in srgb, var(--bg) 70%, transparent);
  border-bottom: 1px solid var(--border);
}
.header-row{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap: 14px;
  padding: 14px 0;
}

.brand{
  display:flex;
  align-items:center;
  gap: 12px;
  padding: 8px 10px;
  border-radius: 12px;
}
.brand:hover{ background: var(--surface); text-decoration:none; }
.brand-mark{
  width: 38px;
  height: 38px;
  display:grid;
  place-items:center;
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  border-radius: 12px;
  color: white;
  font-weight: 800;
  box-shadow: var(--shadow);
}
.brand-text{ display:flex; flex-direction:column; line-height:1.1; }
.brand-text small{ color: var(--muted); font-weight: 500; }

.nav{
  display:flex;
  align-items:center;
  gap: 8px;
  flex-wrap: wrap;
}
.nav-link{
  padding: 10px 12px;
  border-radius: 12px;
  color: var(--muted);
}
.nav-link:hover{ background: var(--surface); text-decoration:none; color: var(--text); }
.nav-link.is-active{
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
}

.header-actions{
  display:flex;
  align-items:center;
  gap: 10px;
  min-width: 280px;
  justify-content: flex-end;
}

/* Search */
.search{
  display:flex;
  align-items:center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: var(--surface);
  flex: 1;
  max-width: 420px;
}
.search-icon{ color: var(--muted); }
.search input{
  width: 100%;
  border: 0;
  outline: none;
  background: transparent;
  color: var(--text);
  font-size: 14px;
}
.search input::placeholder{ color: color-mix(in srgb, var(--muted) 85%, transparent); }

/* Hero */
.hero{
  padding: 46px 0 18px;
}
.hero-grid{
  display:grid;
  grid-template-columns: 1.35fr .9fr;
  gap: 22px;
  align-items:start;
}
.hero-copy h1{
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1.05;
  margin: 0 0 12px;
  letter-spacing: -0.02em;
}
.muted{ color: var(--muted); }
.small{ font-size: 13px; }

.hero-cta{
  display:flex;
  gap: 10px;
  margin-top: 18px;
  flex-wrap: wrap;
}
.pill-row{
  display:flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}
.pill{
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--muted);
  font-size: 13px;
}

/* Buttons */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap: 10px;
  padding: 11px 14px;
  border-radius: 14px;
  border: 1px solid transparent;
  cursor:pointer;
  font-weight: 650;
  font-size: 14px;
  transition: transform .08s ease, background .18s ease, border-color .18s ease;
}
.btn:active{ transform: translateY(1px); }
.btn-primary{
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  color: white;
  box-shadow: var(--shadow);
}
.btn-primary:hover{ filter: brightness(1.02); text-decoration:none; }
.btn-ghost{
  background: transparent;
  border-color: var(--border);
  color: var(--text);
}
.btn-ghost:hover{ background: var(--surface); text-decoration:none; }
.btn-soft{
  background: var(--surface);
  border-color: var(--border);
  color: var(--text);
}
.btn-soft:hover{ background: var(--surface-2); text-decoration:none; }

/* Cards / Panels */
.hero-panel .panel-card{
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: linear-gradient(180deg, var(--surface), transparent);
  box-shadow: var(--shadow);
  padding: 16px;
}
.panel-head{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap: 10px;
  margin-bottom: 12px;
}
.panel-head h2{
  margin:0;
  font-size: 16px;
}
.badge{
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 12px;
  background: color-mix(in srgb, var(--primary) 18%, transparent);
  border: 1px solid color-mix(in srgb, var(--primary) 30%, transparent);
  color: var(--text);
}
.badge-soft{
  background: var(--surface);
  border-color: var(--border);
  color: var(--muted);
}

/* Form styling */
.form-grid{
  display:grid;
  gap: 12px;
}
.form-grid.two{
  grid-template-columns: 1fr 1fr;
}
.field{
  display:flex;
  flex-direction:column;
  gap: 6px;
}
.field span{
  color: var(--muted);
  font-size: 13px;
}
input, select, textarea{
  padding: 11px 12px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  outline: none;
  transition: border-color .15s ease, background .15s ease;
}
input:focus, select:focus, textarea:focus{
  border-color: color-mix(in srgb, var(--primary) 55%, var(--border));
  background: var(--surface-2);
}
textarea{ resize: vertical; }

.btn-row{
  grid-column: 1 / -1;
  display:flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items:center;
}

/* Result blocks */
.result-box{
  margin-top: 14px;
  padding: 14px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  display:flex;
  align-items:flex-start;
  justify-content:space-between;
  gap: 12px;
}
.result-value{
  font-size: 24px;
  font-weight: 800;
  letter-spacing: -0.02em;
}
.result-meta{
  display:flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content:flex-end;
}
.chip{
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  font-size: 12px;
}

/* Sections */
.section{ padding: 26px 0 46px; }
.section-alt{
  border-top: 1px solid var(--border);
  background: linear-gradient(180deg, transparent, color-mix(in srgb, var(--surface) 50%, transparent));
}
.section-head{
  display:flex;
  align-items:flex-end;
  justify-content:space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}
.section-head h2{ margin:0; letter-spacing:-0.01em; }

/* Tabs */
.tabs{
  display:flex;
  gap: 8px;
  flex-wrap: wrap;
}
.tab{
  padding: 9px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  cursor:pointer;
}
.tab:hover{ background: var(--surface); color: var(--text); }
.tab.is-active{
  background: var(--surface);
  color: var(--text);
}

/* Tool grid */
.grid{
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--gap);
}
.card{
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: linear-gradient(180deg, var(--surface), transparent);
  padding: 16px;
  box-shadow: 0 10px 34px rgba(0,0,0,.18);
  transition: transform .12s ease, background .18s ease, border-color .18s ease;
  min-height: 170px;
}
.card:hover{
  transform: translateY(-2px);
  background: linear-gradient(180deg, var(--surface-2), transparent);
  border-color: color-mix(in srgb, var(--primary) 25%, var(--border));
}
.card-icon{
  width: 42px;
  height: 42px;
  display:grid;
  place-items:center;
  border-radius: 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  margin-bottom: 10px;
}
.card h3{ margin: 0 0 6px; }
.card p{ margin: 0 0 14px; }
.card-link{
  color: color-mix(in srgb, var(--primary) 75%, var(--text));
  font-weight: 700;
}

/* CTA card */
.cta-card{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap: 14px;
  padding: 18px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: linear-gradient(135deg, color-mix(in srgb, var(--primary) 14%, transparent), var(--surface));
  box-shadow: var(--shadow);
  margin-bottom: 18px;
}

/* Calculator layout */
.calc-layout{
  display:grid;
  grid-template-columns: 1.2fr .8fr;
  gap: var(--gap);
  align-items:start;
}
.calc-card, .result-card{
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: linear-gradient(180deg, var(--surface), transparent);
  box-shadow: var(--shadow);
  padding: 16px;
}
.calc-head{ margin-bottom: 12px; }
.calc-head h3{ margin:0; }
.result-head{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap: 10px;
}
.result-big{
  margin-top: 10px;
  padding: 12px;
  border-radius: var(--radius);
  border: 1px dashed var(--border);
  background: color-mix(in srgb, var(--surface) 60%, transparent);
}
.result-number{
  font-size: 34px;
  font-weight: 900;
  letter-spacing: -0.03em;
  margin: 2px 0 10px;
}

.mini-grid{
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-top: 12px;
}
.mini{
  padding: 12px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
}
.mini-value{
  font-weight: 800;
  margin-top: 4px;
}

/* Footer */
.site-footer{
  border-top: 1px solid var(--border);
  padding: 18px 0;
}
.footer-row{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap: 12px;
  flex-wrap: wrap;
}
.footer-links{
  display:flex;
  gap: 12px;
}
.footer-links a{ color: var(--muted); }
.footer-links a:hover{ color: var(--text); }

/* Responsive */
@media (max-width: 980px){
  .hero-grid{ grid-template-columns: 1fr; }
  .header-actions{ min-width: 0; }
  .grid{ grid-template-columns: repeat(2, 1fr); }
  .calc-layout{ grid-template-columns: 1fr; }
}

@media (max-width: 560px){
  .nav{ display:none; }
  .grid{ grid-template-columns: 1fr; }
  .form-grid.two{ grid-template-columns: 1fr; }
  .mini-grid{ grid-template-columns: 1fr; }
}



/* =========================
   Expandable Header Buttons
   ========================= */

.nav-item{
  position: relative;
}

.nav-btn{
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 14px;
  border-radius: 12px;
  background: transparent;
  border: 1px solid transparent;
  color: var(--muted);
  cursor: pointer;
  font: inherit;
}

.nav-btn:hover{
  background: var(--surface);
  color: var(--text);
}

.chev{
  font-size: 12px;
  transition: transform .18s ease;
}

/* Dropdown box */
.nav-dropdown{
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  min-width: 220px;
  padding: 8px;
  border-radius: 16px;
  background: linear-gradient(180deg, var(--surface), transparent);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);

  opacity: 0;
  transform: translateY(-6px);
  pointer-events: none;
  transition: opacity .18s ease, transform .18s ease;
  z-index: 100;
}

.nav-dropdown a{
  display: block;
  padding: 10px 12px;
  border-radius: 10px;
  color: var(--muted);
  font-size: 14px;
}

.nav-dropdown a:hover{
  background: var(--surface-2);
  color: var(--text);
  text-decoration: none;
}

.nav-dropdown hr{
  border: none;
  border-top: 1px solid var(--border);
  margin: 6px 0;
}

/* Hover to open (desktop) */
.nav-item:hover .nav-dropdown{
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.nav-item:hover .chev{
  transform: rotate(180deg);
}
.nav-item.open .nav-dropdown{
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.nav-item.open .chev{
  transform: rotate(180deg);
}