/* ===================================================================
   DESIGN TOKENS
   =================================================================== */
:root{
  --bg: #F6F7F4;
  --surface: #FFFFFF;
  --ink: #16241D;
  --ink-soft: #4B5A52;
  --border: #DCE3DD;
  --primary: #1F6F5C;
  --primary-dark: #164F41;
  --primary-tint: #E7F1EE;
  --amber: #A8720E;
  --amber-tint: #FBF1DE;
  --green: #2C7A4B;
  --green-tint: #E7F4EC;
  --red: #A83A2E;
  --red-tint: #FAEBE8;
  --neutral-tint: #EEF1F8;
  --blue: #35577A;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 2px rgba(22,36,29,0.06), 0 4px 14px rgba(22,36,29,0.05);
  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;
}

#gscs-app, #gscs-app *{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
#gscs-ap#gscs-app p{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:var(--font-body);
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
}
#gscs-app h1,#gscs-app h2,#gscs-app h3,#gscs-app h4{ font-family:var(--font-display); color:var(--ink); margin:0 0 .5em; line-height:1.2; }
#gscs-app h1{ font-size: clamp(1.7rem, 3.6vw, 2.6rem); font-weight:700; }
#gscs-app h2{ font-size: clamp(1.3rem, 2.4vw, 1.7rem); font-weight:700; }
#gscs-app h3{ font-size:1.05rem; font-weight:600; }
#gscs-app p{ margin:0 0 1em; color:var(--ink-soft); }
#gscs-app a{ color:var(--primary-dark); }
#gscs-app .container{ max-width:1080px; margin:0 auto; padding:0 20px; }
#gscs-app section{ padding: 56px 0; }
section.calc-#gscs-app section{ padding: 40px 0; }
.divider{ height:1px; background:var(--border); }

/* skip link */
.skip-link{ position:absolute; left:-9999px; top:0; background:var(--primary); color:#fff; padding:10px 16px; z-index:200; border-radius:0 0 8px 0; }
.skip-link:focus{ left:0; }

/* focus states */
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, [tabindex]:focus-visible{
  outline: 3px solid var(--primary);
  outline-offset: 2px;
}

/* ===================================================================
   HERO
   =================================================================== */
header.hero{
  background: linear-gradient(180deg, #EFF4EF 0%, var(--bg) 100%);
  border-bottom:1px solid var(--border);
  padding: 52px 0 40px;
}
.eyebrow{
  display:inline-flex; align-items:center; gap:8px;
  font-family:var(--font-mono); font-size:.72rem; letter-spacing:.08em; text-transform:uppercase;
  color:var(--primary-dark); background:var(--primary-tint); border:1px solid #CBE2DA;
  padding:5px 10px; border-radius:20px; margin-bottom:16px;
}
.hero-grid{ display:grid; grid-template-columns: 1.3fr 1fr; gap:32px; align-items:start; }
.hero-lede{ font-size:1.05rem; max-width:56ch; }
.hero-stats{ display:grid; grid-template-columns:repeat(2,1fr); gap:12px; }
.stat-plate{
  background:var(--surface); border:1px solid var(--border); border-radius:var(--radius-sm);
  padding:14px 16px; box-shadow:var(--shadow);
}
.stat-plate .num{ font-family:var(--font-mono); font-weight:600; font-size:1.3rem; color:var(--primary-dark); display:block; }
.stat-plate .lbl{ font-size:.78rem; color:var(--ink-soft); }
@media (max-width:820px){ .hero-grid{ grid-template-columns:1fr; } }

/* ===================================================================
   GLOBAL SETTINGS BAR
   =================================================================== */
.settings-bar{
  background:var(--surface); border:1px solid var(--border); border-radius:var(--radius);
  box-shadow:var(--shadow); padding:18px 20px; margin-top: -8px;
}
.settings-grid{ display:grid; grid-template-columns:repeat(auto-fit,minmax(180px,1fr)); gap:14px; align-items:end; }
.field label{ display:block; font-size:.78rem; font-weight:600; color:var(--ink); margin-bottom:5px; }
.field label .hint-btn{ font-weight:500; color:var(--primary-dark); cursor:help; border-bottom:1px dotted var(--primary-dark); }
select, input[type="number"], input[type="date"], input[type="text"]{
  width:100%; padding:9px 10px; border:1px solid var(--border); border-radius:var(--radius-sm);
  background:#fff; font-family:var(--font-body); font-size:.92rem; color:var(--ink);
}
select:disabled{ background:#F2F3F0; color:#9AA79E; }
.settings-note{ font-size:.78rem; color:var(--ink-soft); margin-top:10px; }

/* ===================================================================
   NAV
   =================================================================== */
.calc-nav-wra#gscs-app p{
  position:sticky; top:0; z-index:60; background:rgba(246,247,244,0.92); backdrop-filter:blur(6px);
  border-bottom:1px solid var(--border);
}
.calc-nav{
  display:flex; gap:8px; overflow-x:auto; padding:10px 20px; max-width:1080px; margin:0 auto;
  -webkit-overflow-scrolling:touch; scrollbar-width:thin;
}
.calc-nav::-webkit-scrollbar{ height:6px; }
.calc-nav::-webkit-scrollbar-thumb{ background:var(--border); border-radius:4px; }
.nav-btn{
  flex:0 0 auto; display:flex; align-items:center; gap:8px;
  font-family:var(--font-body); font-weight:600; font-size:.84rem; color:var(--ink);
  background:#fff; border:1px solid var(--border); border-radius:20px; padding:8px 14px;
  cursor:pointer; white-space:nowrap; text-decoration:none;
}
.nav-btn:hover{ border-color:var(--primary); color:var(--primary-dark); }
.nav-btn.active{ background:var(--primary); border-color:var(--primary); color:#fff; }
.nav-btn .n{ font-family:var(--font-mono); font-size:.72rem; opacity:.75; }

/* ===================================================================
   CALCULATOR CARD
   =================================================================== */
.calc-card{
  background:var(--surface); border:1px solid var(--border); border-radius:var(--radius);
  box-shadow:var(--shadow); padding:28px; scroll-margin-top:70px;
}
.calc-head{ display:flex; gap:14px; align-items:flex-start; margin-bottom:18px; }
.calc-badge{
  flex:0 0 auto; width:38px; height:38px; border-radius:9px; background:var(--primary-dark);
  color:#fff; font-family:var(--font-mono); font-weight:600; display:flex; align-items:center; justify-content:center;
}
.calc-#gscs-ap#gscs-app p{ display:grid; grid-template-columns: 1.05fr 1fr; gap:28px; }
@media (max-width:860px){ .calc-#gscs-ap#gscs-app p{ grid-template-columns:1fr; } }

.input-panel fieldset{ border:0; padding:0; margin:0 0 16px; }
.input-panel legend{ font-weight:700; font-size:.85rem; margin-bottom:8px; padding:0; }
.field-row{ display:grid; grid-template-columns:1fr 1fr; gap:10px; margin-bottom:12px; }
.field-row.single{ grid-template-columns:1fr; }
.field{ margin-bottom:0; }
.field .unit-inline{ display:flex; gap:8px; }
.field .unit-inline select{ flex:0 0 auto; width:auto; min-width:80px; }
.method-toggle{ display:flex; gap:8px; flex-wrap:wrap; margin-bottom:14px; }
.method-toggle button{
  flex:1 1 auto; padding:8px 10px; font-size:.82rem; font-weight:600; border-radius:8px;
  border:1px solid var(--border); background:#fff; color:var(--ink-soft); cursor:pointer;
}
.method-toggle button[aria-pressed="true"]{ background:var(--primary-tint); border-color:var(--primary); color:var(--primary-dark); }
.yn-toggle{ display:flex; gap:8px; }
.yn-toggle button{ flex:1; padding:8px; border-radius:8px; border:1px solid var(--border); background:#fff; cursor:pointer; font-weight:600; font-size:.85rem; color:var(--ink-soft); }
.yn-toggle button[aria-pressed="true"]{ background:var(--primary-tint); border-color:var(--primary); color:var(--primary-dark); }
.hidden{ display:none !important; }
.error-msg{ color:var(--red); font-size:.78rem; margin-top:4px; display:none; }
.error-msg.show{ display:block; }
.field.has-error select, .field.has-error input{ border-color:var(--red); }

.action-row{ display:flex; gap:10px; margin-top:18px; flex-wrap:wrap; }
.btn{ font-family:var(--font-body); font-weight:600; font-size:.88rem; padding:10px 18px; border-radius:8px; border:1px solid var(--border); cursor:pointer; background:#fff; color:var(--ink); }
.btn-primary{ background:var(--primary); border-color:var(--primary); color:#fff; }
.btn-primary:hover{ background:var(--primary-dark); }
.btn-ghost:hover{ border-color:var(--primary); }
.btn-sm{ padding:7px 12px; font-size:.78rem; }

/* results */
.results-panel{ display:flex; flex-direction:column; gap:12px; }
.result-plate{
  border:1px solid var(--border); border-radius:var(--radius-sm); padding:16px; background:var(--neutral-tint);
}
.result-plate.primary{
  background: var(--primary-dark); color:#fff; border-color:var(--primary-dark);
}
.result-plate.primary .plate-label{ color:#CFE7DE; }
.result-plate .plate-label{ font-family:var(--font-mono); font-size:.72rem; text-transform:uppercase; letter-spacing:.06em; color:var(--ink-soft); margin-bottom:6px; }
.result-plate .plate-value{ font-family:var(--font-mono); font-weight:600; font-size:1.6rem; }
.result-plate .plate-sub{ font-size:.82rem; margin-top:4px; opacity:.9; }
.conv-grid{ display:grid; grid-template-columns:repeat(2,1fr); gap:8px; }
.conv-item{ background:#fff; border:1px solid var(--border); border-radius:6px; padding:8px 10px; }
.conv-item .v{ font-family:var(--font-mono); font-weight:600; }
.conv-item .u{ font-size:.72rem; color:var(--ink-soft); }

.status-chi#gscs-app p{ display:inline-flex; align-items:center; gap:6px; font-weight:700; font-size:.82rem; padding:6px 12px; border-radius:20px; }
.status-green{ background:var(--green-tint); color:var(--green); border:1px solid #BFE3CC; }
.status-amber{ background:var(--amber-tint); color:var(--amber); border:1px solid #EFD79B; }
.status-red{ background:var(--red-tint); color:var(--red); border:1px solid #EFC3BC; }
.status-blue{ background:var(--neutral-tint); color:var(--blue); border:1px solid #C9D3E8; }

.assumptions-list{ font-size:.85rem; margin:0; padding-left:18px; color:var(--ink-soft); }
.assumptions-list li{ margin-bottom:4px; }
.note-box{ font-size:.82rem; background:var(--amber-tint); border:1px solid #EFD79B; color:#6B4A0B; border-radius:8px; padding:10px 12px; }
.disclaimer-box{ font-size:.82rem; background:var(--neutral-tint); border:1px solid var(--border); border-radius:8px; padding:12px 14px; color:var(--ink-soft); }
.source-row{ font-size:.78rem; color:var(--ink-soft); border-top:1px dashed var(--border); padding-top:8px; margin-top:4px; }
.results-empty{ font-size:.88rem; color:var(--ink-soft); border:1px dashed var(--border); border-radius:8px; padding:18px; text-align:center; }

/* pricing rows */
.cost-table{ width:100%; border-collapse:collapse; font-size:.85rem; }
.cost-table th, .cost-table td{ text-align:left; padding:8px 6px; border-bottom:1px solid var(--border); }
.cost-table th{ font-family:var(--font-mono); font-size:.7rem; text-transform:uppercase; color:var(--ink-soft); }
@media (max-width:520px){
  .cost-table thead{ display:none; }
  .cost-table, .cost-table tbody, .cost-table tr, .cost-table td{ display:block; width:100%; }
  .cost-table tr{ border-bottom:1px solid var(--border); padding:8px 0; }
  .cost-table td{ border:0; padding:2px 0; }
  .cost-table td::before{ content: attr(data-label) ": "; font-weight:600; color:var(--ink-soft); }
}

.tooltip-wra#gscs-app p{ position:relative; display:inline-block; }
.tooltip-btn{ background:none; border:1px solid var(--border); border-radius:50%; width:16px; height:16px; font-size:.65rem; line-height:1; color:var(--ink-soft); cursor:help; padding:0; }
.tooltip-po#gscs-app p{ display:none; position:absolute; z-index:20; bottom:120%; left:0; width:220px; background:var(--ink); color:#fff; font-size:.75rem; padding:8px 10px; border-radius:6px; font-weight:400; }
.tooltip-wrap:hover .tooltip-pop, .tooltip-wrap:focus-within .tooltip-po#gscs-app p{ display:block; }

.faq-item{ border-bottom:1px solid var(--border); padding:14px 0; }
.faq-q{ width:100%; text-align:left; background:none; border:0; font-weight:700; font-size:.98rem; cursor:pointer; display:flex; justify-content:space-between; gap:10px; color:var(--ink); padding:0; }
.faq-#gscs-app a{ margin-top:8px; display:none; font-size:.92rem; }
.faq-item.open .faq-#gscs-app a{ display:block; }
.faq-item.open .chev{ transform:rotate(180deg); }
.chev{ transition:transform .15s ease; }

footer.site-footer{ background:var(--primary-dark); color:#E9F1EE; padding:40px 0; }
footer.site-footer #gscs-app a{ color:#CFE7DE; }
footer .foot-disclaimer{ font-size:.82rem; color:#CFE7DE; border-top:1px solid rgba(255,255,255,.18); padding-top:16px; margin-top:16px; }

.methodology-grid{ display:grid; grid-template-columns:repeat(auto-fit,minmax(240px,1fr)); gap:16px; }
.method-card{ background:var(--surface); border:1px solid var(--border); border-radius:var(--radius-sm); padding:16px; }

@media print{
  .no-print, header.hero, .settings-bar, .calc-nav-wrap, .calc-card .action-row, .site-footer, .calc-card:not(.print-target){ display:none !important; }
  #gscs-ap#gscs-app p{ background:#fff; }
}
#gscs-app{background:var(--bg);color:var(--ink);font-family:var(--font-body);line-height:1.55;-webkit-font-smoothing:antialiased;}