/* ═══════════════════════════════════════════════
   PERIMTR — SITE CSS
   IBM Plex design system · consistent with report
   ═══════════════════════════════════════════════ */

/* ── DESIGN TOKENS ─────────────────────────────── */
:root {
  --ink:       #111110;
  --muted:     #6b6b67;
  --dim:       #f6f5f1;
  --rule:      #e2e0db;
  --accent:    #1633c0;
  --accent-bg: #eef1fb;
  --page:      #ffffff;
}

/* ── RESET ──────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

/* ── BASE ───────────────────────────────────────── */
html { font-size: 16px; }

body {
  font-family: 'IBM Plex Sans', sans-serif;
  font-size: 15px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--page);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── NAV ────────────────────────────────────────── */
.peri-nav {
  background: var(--dim);
  border-bottom: 1px solid var(--rule);
  padding: 0 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
  position: sticky;
  top: 0;
  z-index: 100;
}

.peri-logo {
  font-family: 'IBM Plex Sans', sans-serif;
  font-weight: 700;
  font-size: 20px;
  letter-spacing: -0.04em;
  color: var(--ink);
  text-decoration: none;
  line-height: 1;
}
.peri-logo:hover { text-decoration: none; }
.peri-logo .mtr { color: var(--accent); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}
.nav-links a {
  font-family: 'IBM Plex Sans', sans-serif;
  font-size: 14px;
  font-weight: 400;
  color: var(--muted);
  text-decoration: none;
}
.nav-links a:hover { color: var(--ink); text-decoration: none; }

.nav-cta {
  background: var(--accent);
  color: #ffffff !important;
  padding: 8px 18px;
  font-size: 13px !important;
  font-weight: 500 !important;
}
.nav-cta:hover { opacity: 0.9; text-decoration: none !important; }

/* ── FOOTER ─────────────────────────────────────── */
.peri-footer {
  background: var(--dim);
  border-top: 1px solid var(--rule);
  padding: 40px;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 40px;
  margin-top: 120px;
}
.footer-brand {
  font-family: 'IBM Plex Sans', sans-serif;
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.04em;
  color: var(--ink);
}
.footer-brand .mtr { color: var(--accent); }
.footer-tagline {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 10px;
  color: var(--muted);
  letter-spacing: 0.06em;
  margin-top: 6px;
}
.footer-links {
  display: flex;
  gap: 24px;
  list-style: none;
  align-items: center;
  flex-wrap: wrap;
}
.footer-links a {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 10px;
  letter-spacing: 0.06em;
  color: var(--accent);
  text-decoration: none;
  text-transform: uppercase;
}
.footer-links a:hover { text-decoration: underline; }
.footer-copy {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 10px;
  color: var(--muted);
  letter-spacing: 0.06em;
  margin-top: 6px;
}

/* ── LAYOUT UTILITIES ───────────────────────────── */
.container {
  max-width: 880px;
  margin: 0 auto;
  padding: 0 40px;
}
.container-narrow {
  max-width: 640px;
  margin: 0 auto;
  padding: 0 40px;
}
.container-prose {
  max-width: 680px;
  margin: 0 auto;
  padding: 0 40px;
}

/* ── SECTION DIVIDER ────────────────────────────── */
.sec-divider {
  height: 1px;
  background: var(--rule);
  margin: 64px 0;
}

/* ── PAGE HEADER ────────────────────────────────── */
.page-header {
  padding: 72px 0 48px;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 64px;
}
.page-eyebrow {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 9px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
  display: block;
  margin-bottom: 16px;
}
.page-h1 {
  font-family: 'IBM Plex Sans', sans-serif;
  font-size: 48px;
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.05;
  color: var(--ink);
  margin-bottom: 16px;
}
.page-sub {
  font-family: 'IBM Plex Sans', sans-serif;
  font-size: 16px;
  color: var(--muted);
  max-width: 520px;
}

/* ── BUTTONS ────────────────────────────────────── */
.btn {
  display: inline-block;
  font-family: 'IBM Plex Sans', sans-serif;
  font-size: 14px;
  font-weight: 500;
  padding: 14px 28px;
  border: none;
  cursor: pointer;
  text-decoration: none;
  line-height: 1;
}
.btn-primary {
  background: var(--accent);
  color: #ffffff;
}
.btn-primary:hover { opacity: 0.9; text-decoration: none; color: #ffffff; }
.btn-ghost {
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent);
}
.btn-ghost:hover { background: var(--accent-bg); text-decoration: none; }
.btn-white {
  background: #ffffff;
  color: var(--accent);
}
.btn-white:hover { opacity: 0.92; text-decoration: none; color: var(--accent); }

/* ── SECTION LABEL ──────────────────────────────── */
.sec-label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 9px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
  display: block;
  margin-bottom: 24px;
}

/* ── CARD ───────────────────────────────────────── */
.card {
  background: var(--dim);
  border: 1px solid var(--rule);
  padding: 24px;
}
.card-label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 9px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
  display: block;
  margin-bottom: 10px;
}
.card-title {
  font-family: 'IBM Plex Sans', sans-serif;
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 4px;
}

/* ── FORM ELEMENTS ──────────────────────────────── */
.form-group { margin-bottom: 20px; }
.form-label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  display: block;
  margin-bottom: 8px;
}
.form-input {
  width: 100%;
  font-family: 'IBM Plex Sans', sans-serif;
  font-size: 15px;
  padding: 12px 16px;
  border: 1px solid var(--rule);
  background: var(--page);
  color: var(--ink);
  outline: none;
  border-radius: 0;
  -webkit-appearance: none;
}
.form-input:focus { border-color: var(--accent); }
.form-hint {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 10px;
  color: var(--muted);
  margin-top: 8px;
  letter-spacing: 0.04em;
}
.form-submit {
  width: 100%;
  background: var(--accent);
  color: #ffffff;
  font-family: 'IBM Plex Sans', sans-serif;
  font-size: 15px;
  font-weight: 500;
  padding: 14px;
  border: none;
  cursor: pointer;
  margin-top: 8px;
  border-radius: 0;
}
.form-submit:hover { opacity: 0.9; }

/* ── PROSE ──────────────────────────────────────── */
.prose h2 {
  font-family: 'IBM Plex Sans', sans-serif;
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin: 48px 0 12px;
}
.prose h3 {
  font-family: 'IBM Plex Sans', sans-serif;
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  margin: 32px 0 8px;
}
.prose p {
  font-family: 'IBM Plex Sans', sans-serif;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
  margin-bottom: 16px;
}
.prose p b, .prose p strong { color: var(--ink); font-weight: 600; }
.prose ul {
  padding-left: 20px;
  margin-bottom: 16px;
}
.prose ul li {
  font-family: 'IBM Plex Sans', sans-serif;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
  margin-bottom: 6px;
}

/* ── DISCLAIMER BOX ─────────────────────────────── */
.disclaimer-box {
  padding: 20px 24px;
  background: var(--dim);
  border: 1px solid var(--rule);
  font-family: 'IBM Plex Sans', sans-serif;
  font-size: 13px;
  line-height: 1.65;
  color: var(--muted);
  margin: 32px 0;
}
.disclaimer-box b { color: var(--ink); font-weight: 600; }

/* ── DATA TABLE ─────────────────────────────────── */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
}
.data-table thead th {
  text-align: left;
  font-family: 'IBM Plex Sans', sans-serif;
  font-weight: 500;
  font-size: 9px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  padding: 0 16px 12px 0;
  border-bottom: 1px solid var(--ink);
}
.data-table tbody td {
  padding: 12px 16px 12px 0;
  border-bottom: 1px solid var(--rule);
  color: var(--ink);
  vertical-align: top;
  line-height: 1.5;
}
.data-table tbody tr:last-child td { border-bottom: none; }
.class-badge {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 9px;
  letter-spacing: 0.1em;
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: 1px 5px;
  display: inline-block;
}