/* Lightweight, system-font-first stylesheet.
   No external font requests. Designed to keep CLS at 0 and FCP fast. */

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
               Arial, "Noto Sans", sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: #1f2937;
  background: #fff;
  -webkit-font-smoothing: antialiased;
}
img, svg { max-width: 100%; display: block; }
a { color: #14744d; }
a:hover { color: #0f3d2e; }
h1, h2, h3, h4 {
  font-family: Georgia, "Times New Roman", serif;
  color: #0f3d2e;
  line-height: 1.25;
  margin: 0 0 .6em;
}
h1 { font-size: clamp(1.7rem, 3.2vw, 2.4rem); }
h2 { font-size: clamp(1.35rem, 2.4vw, 1.75rem); margin-top: 1.6em; }
h3 { font-size: 1.15rem; }
p  { margin: 0 0 1em; }
code, kbd, samp, .mono {
  font-family: "JetBrains Mono", "Cascadia Mono", Consolas, "Courier New", monospace;
  font-size: .95em;
  background: #f3f6f4;
  padding: .12em .35em;
  border-radius: 4px;
}

:root {
  --green-900: #0f3d2e;
  --green-700: #14744d;
  --green-500: #1f9d63;
  --green-100: #e6f5ec;
  --gray-50:  #f7faf8;
  --gray-100: #eef2f0;
  --gray-200: #e2e8e4;
  --gray-300: #cbd5d0;
  --gray-500: #6b7280;
  --gray-700: #374151;
  --gray-900: #1f2937;
  --shadow-sm: 0 1px 2px rgba(15, 61, 46, .06);
  --shadow-md: 0 6px 18px -8px rgba(15, 61, 46, .18);
}

.container { width: min(1080px, 92%); margin: 0 auto; }

/* ---- Header ---- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.95);
  border-bottom: 1px solid var(--gray-200);
  backdrop-filter: saturate(150%) blur(6px);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  padding: .8rem 0;
}
.brand { display: inline-flex; align-items: center; gap: .6rem; font-weight: 700; font-size: 1rem; line-height: 1.1; }
.brand-mark {
  display: inline-grid; place-items: center;
  width: 34px; height: 34px; border-radius: 8px;
  background: var(--green-700); color: #fff; font-weight: 800; font-size: .82rem;
  letter-spacing: .5px; flex-shrink: 0;
}
.brand-text { display: inline-flex; flex-direction: column; gap: 1px; }
.brand-name { color: var(--green-900); font-family: Georgia, serif; font-size: 1rem; }
.brand-tagline {
  font-family: Georgia, "Times New Roman", serif;
  font-size: .72rem; font-style: italic; font-weight: 400;
  color: var(--green-700); letter-spacing: .1px;
}
@media (max-width: 720px) { .brand-tagline { display: none; } }
.nav { display: flex; flex-wrap: wrap; gap: .25rem .9rem; align-items: center; row-gap: .25rem; }
.nav a { font-weight: 500; color: var(--gray-900); font-size: .9rem; padding: .25rem 0; white-space: nowrap; }
.nav a:hover { color: var(--green-700); }
.nav-toggle {
  display: none; background: transparent; border: 0; padding: .4rem; cursor: pointer;
}
.nav-toggle span {
  display: block; width: 22px; height: 2px; background: var(--green-900);
  margin: 5px 0; transition: transform .2s, opacity .2s;
}

/* ---- Hero ---- */
.hero { padding: 3rem 0 1.5rem; background: linear-gradient(180deg, #fff 0%, var(--gray-50) 100%); }
.hero-inner { max-width: 820px; }
.eyebrow {
  text-transform: uppercase; letter-spacing: 1.4px; font-size: .78rem;
  color: var(--green-700); font-weight: 700; margin-bottom: .6rem;
}
.lead { font-size: 1.08rem; color: var(--gray-700); }

/* ---- Tool ---- */
.tool {
  margin: 1.5rem 0 2rem;
  background: #fff;
  border: 1px solid var(--gray-200);
  border-radius: 12px;
  padding: 1.4rem;
  box-shadow: var(--shadow-md);
}
.tool-row {
  display: grid; gap: .9rem;
  grid-template-columns: 1fr auto 1fr auto;
  align-items: end;
  margin-bottom: 1rem;
}
.tool-row label {
  display: grid; gap: .35rem;
  font-size: .85rem; color: var(--gray-700); font-weight: 600;
}
.tool-row select {
  font: inherit; padding: .55rem .7rem;
  border: 1px solid var(--gray-300); border-radius: 8px;
  background: #fff; min-width: 0;
}
.swap-btn {
  align-self: end;
  background: var(--green-100); color: var(--green-900);
  border: 1px solid var(--gray-200); border-radius: 8px;
  padding: .55rem .8rem; font: inherit; font-weight: 600;
  cursor: pointer; height: 38px;
}
.swap-btn:hover { background: var(--green-500); color: #fff; }
.tool-areas {
  display: grid; gap: 1rem;
  grid-template-columns: 1fr 1fr;
}
.tool-areas label {
  display: grid; gap: .35rem;
  font-size: .85rem; color: var(--gray-700); font-weight: 600;
}
.tool-areas textarea {
  font-family: "JetBrains Mono", "Cascadia Mono", Consolas, "Courier New", monospace;
  font-size: .95rem; line-height: 1.55;
  width: 100%; min-height: 220px;
  padding: .8rem .9rem;
  border: 1px solid var(--gray-300); border-radius: 8px;
  background: var(--gray-50); color: var(--gray-900);
  resize: vertical;
}
.tool-areas textarea:focus {
  outline: none; border-color: var(--green-500);
  box-shadow: 0 0 0 3px rgba(31,157,99,.18);
  background: #fff;
}
.tool-actions {
  display: flex; gap: .6rem; justify-content: space-between;
  align-items: center; margin-top: .9rem; flex-wrap: wrap;
}
.tool-actions .left, .tool-actions .right { display: flex; gap: .5rem; flex-wrap: wrap; }
.btn {
  display: inline-block;
  padding: .55rem 1rem;
  border-radius: 8px;
  font: inherit; font-weight: 600; font-size: .9rem;
  border: 1px solid var(--gray-300); background: #fff; color: var(--gray-900);
  cursor: pointer;
}
.btn:hover { border-color: var(--green-500); color: var(--green-700); }
.btn-primary {
  background: var(--green-700); color: #fff; border-color: var(--green-700);
}
.btn-primary:hover { background: var(--green-900); color: #fff; }
.status {
  font-size: .85rem; color: var(--gray-500); margin: 0;
}

/* Privacy callout under the tool */
.privacy-note {
  margin-top: 1rem;
  padding: .75rem .9rem;
  background: var(--green-100);
  border-left: 3px solid var(--green-500);
  border-radius: 6px;
  font-size: .9rem;
  color: var(--green-900);
}

/* ---- Content ---- */
.content { padding: 1rem 0 3rem; }
.content section { margin-bottom: 2.4rem; }
.content ul, .content ol { padding-left: 1.4rem; }
.content li { margin: .25rem 0; }

.author-card {
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 1.2rem;
  align-items: start;
  padding: 1.4rem;
  border: 1px solid var(--gray-200);
  border-radius: 12px;
  background: var(--gray-50);
  margin: 1rem 0 1.2rem;
}
.author-avatar {
  width: 96px; height: 96px; border-radius: 50%;
  background: linear-gradient(135deg, var(--green-700), var(--green-500));
  color: #fff; font-family: Georgia, serif; font-size: 2.2rem; font-weight: 700;
  display: grid; place-items: center;
}
.author-meta { font-size: .9rem; color: var(--gray-500); margin: 0 0 .4rem; }
.author-credentials {
  display: flex; flex-wrap: wrap; gap: .4rem; margin-top: .6rem;
}
.author-credentials span {
  display: inline-block;
  background: #fff; border: 1px solid var(--gray-200);
  padding: .2rem .55rem; border-radius: 999px;
  font-size: .8rem; color: var(--green-900);
}

/* Reference table */
.fn-table-wrap { overflow-x: auto; border: 1px solid var(--gray-200); border-radius: 10px; }
table.fn-table {
  width: 100%; border-collapse: collapse; font-size: .92rem; min-width: 560px;
}
.fn-table th, .fn-table td {
  padding: .6rem .8rem; text-align: left; border-bottom: 1px solid var(--gray-200);
}
.fn-table thead th {
  background: var(--green-100); color: var(--green-900);
  font-weight: 700; position: sticky; top: 0;
}
.fn-table tbody tr:nth-child(even) td { background: var(--gray-50); }
.fn-table td:first-child { font-family: "JetBrains Mono", Consolas, monospace; font-weight: 600; }

/* Aside callout */
.callout {
  border-left: 3px solid var(--green-700);
  background: var(--gray-50);
  padding: .9rem 1.1rem;
  border-radius: 0 8px 8px 0;
  margin: 1.1rem 0;
  font-size: .95rem;
}

/* TOC */
.toc {
  border: 1px solid var(--gray-200);
  border-radius: 10px;
  padding: 1rem 1.2rem;
  background: #fff;
  margin-bottom: 1.5rem;
}
.toc h2 { font-size: 1rem; margin: 0 0 .5rem; font-family: inherit; color: var(--gray-700); text-transform: uppercase; letter-spacing: 1px; }
.toc ol { margin: 0; padding-left: 1.2rem; }
.toc a { color: var(--gray-900); }
.toc a:hover { color: var(--green-700); }

/* Forms (contact) */
.form-card {
  background: #fff;
  border: 1px solid var(--gray-200);
  border-radius: 12px;
  padding: 1.6rem;
  box-shadow: var(--shadow-sm);
  margin: 1rem 0 2rem;
}
.form-card label {
  display: grid; gap: .35rem; margin-bottom: 1rem;
  font-size: .9rem; color: var(--gray-700); font-weight: 600;
}
.form-card input, .form-card textarea, .form-card select {
  font: inherit;
  padding: .65rem .8rem;
  border: 1px solid var(--gray-300); border-radius: 8px;
  background: #fff;
}
.form-card input:focus, .form-card textarea:focus, .form-card select:focus {
  outline: none; border-color: var(--green-500);
  box-shadow: 0 0 0 3px rgba(31,157,99,.18);
}

/* Footer */
.site-footer {
  background: #0b2a20; color: #c7e3d3;
  padding: 2.2rem 0 1.4rem; margin-top: 2rem;
}
.site-footer a { color: #c7e3d3; }
.site-footer a:hover { color: #fff; }
.footer-grid {
  display: grid; gap: 1.6rem;
  grid-template-columns: 2fr 1fr 1fr;
  margin-bottom: 1.5rem;
}
.site-footer h4 { color: #fff; font-family: inherit; font-size: .95rem; margin-bottom: .6rem; }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin: .35rem 0; }
.footer-bottom {
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: .8rem;
  padding-top: 1.2rem; border-top: 1px solid #14443a;
  color: #88a99a; font-size: .85rem;
}

/* Responsive */
@media (max-width: 820px) {
  .tool-row { grid-template-columns: 1fr 1fr; }
  .swap-btn { grid-column: 1 / -1; }
  .tool-areas { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .author-card { grid-template-columns: 1fr; }
  .author-avatar { width: 72px; height: 72px; font-size: 1.6rem; }

  .nav-toggle { display: block; }
  .nav {
    position: absolute; top: 100%; right: 4%; left: 4%;
    background: #fff; border: 1px solid var(--gray-200); border-radius: 10px;
    flex-direction: column; align-items: stretch; gap: 0;
    padding: .5rem; box-shadow: var(--shadow-md);
    display: none;
  }
  .nav.open { display: flex; }
  .nav a { padding: .65rem .8rem; border-radius: 6px; }
  .nav a:hover { background: var(--green-100); }
}

/* Print friendly */
@media print {
  .site-header, .site-footer, .tool-actions, .nav-toggle { display: none; }
  .tool { box-shadow: none; }
}