/* ==========================================================================
   Turf Calculator AU — shared styles
   Palette grounded in Australian turf: botanical green + wattle gold
   ========================================================================== */

:root {
  --ink: #14261c;        /* botanical near-black green — headings/text */
  --turf: #4e8b3a;       /* fresh grass green — primary */
  --turf-deep: #2f5d28;  /* darker green — hovers */
  --wattle: #e4a72c;     /* AU wattle gold — signature accent */
  --sand: #fafaf4;       /* warm off-white — page bg */
  --paper: #ffffff;      /* card bg */
  --soil: #6b4e2e;       /* warm brown — subtle */
  --line: #e4e6dc;       /* borders */
  --muted: #5c6657;      /* secondary text */
  --danger: #b3492d;

  --maxw: 1080px;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(20,38,28,.05), 0 8px 24px rgba(20,38,28,.06);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--ink);
  background: var(--sand);
  line-height: 1.65;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: "Space Grotesk", system-ui, sans-serif;
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin: 0 0 .5em;
}

h1 { font-size: clamp(2rem, 5vw, 3.1rem); font-weight: 700; }
h2 { font-size: clamp(1.5rem, 3.2vw, 2.1rem); font-weight: 600; margin-top: 1.6em; }
h3 { font-size: 1.25rem; font-weight: 600; margin-top: 1.4em; }

p { margin: 0 0 1.1em; }

a { color: var(--turf-deep); text-decoration-color: rgba(78,139,58,.35); text-underline-offset: 3px; }
a:hover { color: var(--turf); }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }
.narrow { max-width: 760px; }

/* ---- top hairline + header ---- */
.topline { height: 4px; background: linear-gradient(90deg, var(--turf) 0%, var(--turf) 70%, var(--wattle) 70%, var(--wattle) 100%); }

header.site {
  background: var(--paper);
  border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 20;
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; padding: 14px 20px; max-width: var(--maxw); margin: 0 auto;
}
.brand {
  font-family: "Space Grotesk", sans-serif; font-weight: 700; font-size: 1.15rem;
  color: var(--ink); text-decoration: none; display: flex; align-items: center; gap: 9px;
}
.brand .mark {
  width: 26px; height: 26px; border-radius: 6px;
  background: var(--turf); position: relative; flex: none;
  box-shadow: inset 0 -8px 0 rgba(0,0,0,.12);
}
.brand .mark::after {
  content: ""; position: absolute; inset: 0;
  background:
    linear-gradient(transparent 55%, rgba(255,255,255,.5) 55%, rgba(255,255,255,.5) 60%, transparent 60%),
    linear-gradient(90deg, transparent 46%, rgba(20,38,28,.25) 46%, rgba(20,38,28,.25) 54%, transparent 54%);
  border-radius: 6px;
}
.nav-links { display: flex; gap: 20px; flex-wrap: wrap; }
.nav-links a { font-size: .95rem; font-weight: 500; text-decoration: none; color: var(--muted); }
.nav-links a:hover, .nav-links a.active { color: var(--turf-deep); }

/* ---- hero ---- */
.hero { padding: 46px 0 8px; }
.eyebrow {
  font-family: "Space Grotesk", sans-serif; font-weight: 600; font-size: .8rem;
  letter-spacing: .14em; text-transform: uppercase; color: var(--turf);
  margin-bottom: 12px;
}
.hero p.lead { font-size: 1.15rem; color: var(--muted); max-width: 640px; }

/* ---- calculator ---- */
.calc-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 24px; margin: 28px 0 8px; align-items: start; }
@media (max-width: 820px){ .calc-grid { grid-template-columns: 1fr; } }

.card {
  background: var(--paper); border: 1px solid var(--line);
  border-radius: var(--radius); box-shadow: var(--shadow); padding: 24px;
}
.card h2 { margin-top: 0; font-size: 1.35rem; }

.area-row {
  display: grid; grid-template-columns: 1.1fr 1fr 1fr auto; gap: 10px;
  align-items: end; padding: 14px; border: 1px dashed var(--line);
  border-radius: 10px; margin-bottom: 12px; background: #fcfcf8;
}
.area-row.circle, .area-row.triangle { grid-template-columns: 1.1fr 1fr 1fr auto; }
@media (max-width: 520px){ .area-row { grid-template-columns: 1fr 1fr; } }

label { display: block; font-size: .78rem; font-weight: 600; color: var(--muted);
  margin-bottom: 5px; letter-spacing: .01em; }

input, select {
  width: 100%; padding: 10px 12px; font-size: 1rem; font-family: inherit;
  border: 1px solid var(--line); border-radius: 8px; background: #fff; color: var(--ink);
}
input:focus, select:focus { outline: 3px solid rgba(78,139,58,.28); outline-offset: 1px; border-color: var(--turf); }

.btn {
  font-family: "Space Grotesk", sans-serif; font-weight: 600; font-size: .95rem;
  border: none; border-radius: 9px; padding: 11px 18px; cursor: pointer;
  background: var(--turf); color: #fff; transition: background .15s ease;
}
.btn:hover { background: var(--turf-deep); }
.btn.ghost { background: transparent; color: var(--turf-deep); border: 1px solid var(--turf); }
.btn.ghost:hover { background: rgba(78,139,58,.08); }
.btn.small { padding: 8px 12px; font-size: .85rem; }
.btn.icon { background: transparent; color: var(--danger); padding: 8px; font-size: 1.1rem; line-height: 1; }
.btn.icon:hover { background: rgba(179,73,45,.08); }

.row-inline { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; margin: 6px 0 4px; }
.hint { font-size: .82rem; color: var(--muted); margin: 4px 0 0; }

/* ---- result readout (signature) ---- */
.readout {
  background: var(--ink); color: #eef3ea; border-radius: var(--radius);
  padding: 26px 24px; position: sticky; top: 84px;
}
.readout .rlabel { font-family: "Space Grotesk", sans-serif; text-transform: uppercase;
  letter-spacing: .14em; font-size: .72rem; color: #9db89a; margin-bottom: 4px; }
.readout .big {
  font-family: "Space Mono", ui-monospace, monospace; font-size: clamp(2.6rem, 8vw, 3.6rem);
  font-weight: 700; line-height: 1; color: #fff; letter-spacing: -.02em;
}
.readout .big .unit { font-size: 1.4rem; color: var(--wattle); margin-left: 6px; }
.readout .underline { height: 3px; width: 64px; background: var(--wattle); margin: 16px 0 20px; border-radius: 2px; }
.readout .line {
  display: flex; justify-content: space-between; align-items: baseline;
  padding: 11px 0; border-top: 1px solid rgba(255,255,255,.12); font-size: .95rem;
}
.readout .line .v { font-family: "Space Mono", monospace; font-weight: 700; color: #fff; }
.readout .line .k { color: #b9c9b5; }
.readout .muted-note { font-size: .8rem; color: #8fa88c; margin-top: 16px; line-height: 1.5; }

/* ---- generic content ---- */
main.content { padding: 20px 0 60px; }
.content h1 { margin-bottom: .3em; }
.content .lead { font-size: 1.15rem; color: var(--muted); margin-bottom: 1.6em; }

.callout {
  background: #fff; border: 1px solid var(--line); border-left: 4px solid var(--wattle);
  border-radius: 10px; padding: 16px 18px; margin: 22px 0; box-shadow: var(--shadow);
}
.callout strong { color: var(--ink); }

table.data { width: 100%; border-collapse: collapse; margin: 18px 0; font-size: .96rem; }
table.data th, table.data td { text-align: left; padding: 11px 12px; border-bottom: 1px solid var(--line); }
table.data th { font-family: "Space Grotesk", sans-serif; font-size: .82rem; text-transform: uppercase;
  letter-spacing: .05em; color: var(--muted); }
table.data tr:hover td { background: #fbfcf7; }

.faq details {
  border: 1px solid var(--line); border-radius: 10px; padding: 4px 18px; margin-bottom: 10px; background: #fff;
}
.faq summary { cursor: pointer; font-weight: 600; padding: 14px 0; font-family: "Space Grotesk", sans-serif; }
.faq details[open] summary { border-bottom: 1px solid var(--line); margin-bottom: 12px; }

/* ---- ad slot placeholder ---- */
.ad-slot {
  margin: 26px auto; text-align: center; min-height: 90px;
  display: flex; align-items: center; justify-content: center;
  border: 1px dashed var(--line); border-radius: 10px; color: #b7bcae;
  font-size: .8rem; letter-spacing: .08em; text-transform: uppercase; background: #fcfcf8;
}

/* ---- related links ---- */
.related { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px,1fr)); gap: 14px; margin: 28px 0; }
.related a {
  display: block; background: #fff; border: 1px solid var(--line); border-radius: 12px;
  padding: 18px; text-decoration: none; color: var(--ink); box-shadow: var(--shadow);
  transition: transform .12s ease, border-color .12s ease;
}
.related a:hover { transform: translateY(-2px); border-color: var(--turf); }
.related a .t { font-family: "Space Grotesk", sans-serif; font-weight: 600; display: block; margin-bottom: 4px; }
.related a .d { font-size: .88rem; color: var(--muted); }

/* ---- footer ---- */
footer.site {
  background: var(--ink); color: #c7d3c2; margin-top: 40px; padding: 40px 0 30px;
}
footer.site a { color: #dfe8db; }
footer.site .fgrid { display: flex; justify-content: space-between; gap: 30px; flex-wrap: wrap; }
footer.site .fbrand { font-family: "Space Grotesk", sans-serif; font-weight: 700; color: #fff; font-size: 1.1rem; }
footer.site .flinks { display: flex; gap: 22px; flex-wrap: wrap; font-size: .92rem; }
footer.site .fine { border-top: 1px solid rgba(255,255,255,.12); margin-top: 26px; padding-top: 18px;
  font-size: .82rem; color: #93a58f; }

/* ---- accessibility ---- */
:focus-visible { outline: 3px solid rgba(228,167,44,.55); outline-offset: 2px; }
@media (prefers-reduced-motion: reduce){ * { scroll-behavior: auto !important; transition: none !important; } }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 12px; top: 12px; background: #fff; padding: 8px 14px; border-radius: 8px; z-index: 50; }