:root {
  --ink: #0b1220;
  --muted: #4b5563;
  --line: #dbe3ee;
  --bg: #f4f7fb;
  --panel: #ffffff;
  --accent: #0f766e;
  --accent-2: #134e4a;
  --warn: #9a3412;
  --tier1: #166534;
  --tier2: #1d4ed8;
  --tier3: #a16207;
  --tier4: #b91c1c;
  color-scheme: light;
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  font-family: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  color: var(--ink);
  background:
    radial-gradient(900px 420px at 0% -10%, rgba(15, 118, 110, 0.14), transparent 60%),
    radial-gradient(700px 380px at 100% 0%, rgba(19, 78, 74, 0.08), transparent 55%),
    var(--bg);
}

a { color: var(--accent-2); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--accent); }

.shell { max-width: 960px; margin: 0 auto; padding: 1.25rem 1.25rem 3rem; }
.nav {
  display: flex; flex-wrap: wrap; gap: 0.75rem 1.25rem; align-items: baseline;
  padding: 0.75rem 0 1.25rem; border-bottom: 1px solid var(--line); margin-bottom: 1.75rem;
}
.brand {
  font-weight: 700; letter-spacing: 0.04em; text-transform: uppercase;
  font-size: 0.85rem; color: var(--accent-2); margin-right: auto; text-decoration: none;
}
.nav a { font-family: ui-sans-serif, system-ui, sans-serif; font-size: 0.92rem; color: var(--muted); text-decoration: none; }
.nav a.active, .nav a:hover { color: var(--ink); }

h1 { font-size: clamp(1.8rem, 4vw, 2.6rem); letter-spacing: -0.03em; line-height: 1.15; margin: 0 0 0.6rem; }
h2 { font-size: 1.25rem; margin: 1.75rem 0 0.6rem; }
p, li { font-family: ui-sans-serif, system-ui, sans-serif; color: var(--muted); line-height: 1.55; }
.lead { font-size: 1.05rem; max-width: 40rem; }

.grid { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); margin-top: 1.5rem; }
.card {
  background: var(--panel); border: 1px solid var(--line); border-radius: 14px; padding: 1rem 1.1rem;
}
.card h3 { margin: 0 0 0.4rem; font-size: 1.05rem; color: var(--ink); }
.card p { margin: 0; font-size: 0.92rem; }
.meta { font-family: ui-sans-serif, system-ui, sans-serif; font-size: 0.78rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--accent); margin-bottom: 0.75rem; }

.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 12px; background: var(--panel); }
table { width: 100%; border-collapse: collapse; font-family: ui-sans-serif, system-ui, sans-serif; font-size: 0.9rem; }
th, td { text-align: left; padding: 0.7rem 0.85rem; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--ink); font-size: 0.75rem; letter-spacing: 0.05em; text-transform: uppercase; }
td { color: var(--muted); }
tr:last-child td { border-bottom: 0; }

.badge {
  display: inline-block; font-family: ui-sans-serif, system-ui, sans-serif;
  font-size: 0.72rem; font-weight: 700; padding: 0.15rem 0.45rem; border-radius: 999px; color: #fff;
}
.badge.t1 { background: var(--tier1); }
.badge.t2 { background: var(--tier2); }
.badge.t3 { background: var(--tier3); }
.badge.t4 { background: var(--tier4); }

.form { display: grid; gap: 0.75rem; max-width: 28rem; margin-top: 1rem; }
label { font-family: ui-sans-serif, system-ui, sans-serif; font-size: 0.85rem; color: var(--ink); display: grid; gap: 0.3rem; }
input, select, textarea {
  font: inherit; padding: 0.55rem 0.65rem; border: 1px solid var(--line); border-radius: 8px; background: #fff; color: var(--ink);
}
button, .btn {
  font-family: ui-sans-serif, system-ui, sans-serif; font-weight: 650; border: 0; border-radius: 999px;
  padding: 0.65rem 1.1rem; background: var(--accent); color: #fff; cursor: pointer; width: fit-content;
}
button:disabled { opacity: 0.55; cursor: not-allowed; }
.note { font-size: 0.85rem; color: var(--warn); }
.footer { margin-top: 2.5rem; padding-top: 1rem; border-top: 1px solid var(--line); font-family: ui-sans-serif, system-ui, sans-serif; font-size: 0.8rem; color: var(--muted); }