/* Pythias Numerics — Gradient Systems design system */
:root {
  --bg: oklch(0.99 0.002 260);
  --bg-tint: oklch(0.98 0.004 265);
  --text: oklch(0.22 0.01 260);
  --text-soft: oklch(0.48 0.01 260);
  --text-softer: oklch(0.55 0.01 260);
  --border: oklch(0.9 0.005 260);
  --navy: oklch(0.45 0.14 265);
  --magenta: oklch(0.55 0.16 350);
  --tag-bg: oklch(0.95 0.02 265);
  --tag-text: oklch(0.4 0.1 265);
  --card-bg: oklch(0.995 0.003 260);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body.pythias-page {
  margin: 0;
  font-family: "Trebuchet MS", "Segoe UI", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
}
.pythias-page a { color: var(--navy); text-decoration: none; }
.pythias-page a:hover { color: var(--magenta); }
.pythias-page img { max-width: 100%; }
.pythias-wrap { width: 100%; max-width: 1240px; margin: 0 auto; padding: 0 32px; }

.grad-text { background: linear-gradient(90deg, var(--navy), var(--magenta)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.grad-line { height: 3px; width: 56px; border-radius: 2px; background: linear-gradient(90deg, var(--navy), var(--magenta)); }
.grad-btn { background: linear-gradient(90deg, var(--navy), var(--magenta)); color: #fff !important; font-weight: 600; display: inline-block; padding: 15px 30px; border-radius: 26px; font-size: 15px; border: none; cursor: pointer; }
.grad-btn:hover { opacity: 0.92; color: #fff !important; }
.btn-outline { padding: 15px 30px; border-radius: 26px; font-size: 15px; border: 1px solid var(--border); color: var(--text-soft) !important; display: inline-block; }
.btn-outline:hover { border-color: var(--navy); color: var(--navy) !important; }
.card { background: var(--card-bg); border: 1px solid var(--border); border-radius: 18px; }
.tag { font-size: 12px; padding: 6px 14px; border-radius: 20px; background: var(--tag-bg); color: var(--tag-text); display: inline-block; }
.eyebrow-pill { display: inline-flex; align-items: center; gap: 10px; padding: 8px 18px; border-radius: 20px; border: 1px solid var(--border); font-size: 13px; font-weight: 600; color: var(--tag-text); }

/* Nav */
.py-nav { display: flex; align-items: center; justify-content: space-between; padding: 22px 0; }
.py-nav__links { display: flex; align-items: center; gap: 32px; font-size: 14px; font-weight: 600; color: oklch(0.35 0.01 260); }
.py-nav__links a { color: inherit; }
.py-nav__links a.is-active { color: var(--navy); }
.py-nav__logo img { height: 30px; display: block; }
.py-nav__toggle { display: none; background: none; border: 1px solid var(--border); border-radius: 10px; padding: 8px 10px; cursor: pointer; }
.py-nav__toggle span { display: block; width: 20px; height: 2px; background: var(--text); margin: 4px 0; }

@media (max-width: 900px) {
  .py-nav__links { position: absolute; top: 78px; left: 0; right: 0; background: var(--bg); flex-direction: column; align-items: flex-start; gap: 4px; padding: 16px 32px 24px; border-bottom: 1px solid var(--border); display: none; }
  .py-nav__links a { padding: 10px 0; width: 100%; }
  .py-nav__links.is-open { display: flex; }
  .py-nav__toggle { display: block; }
  .py-nav__cta { display: none; }
  .py-nav { position: relative; }
}

/* Hero */
.py-hero { padding: 72px 0 80px; text-align: center; max-width: 900px; margin: 0 auto; }
.py-hero h1 { font-size: 48px; line-height: 1.15; font-weight: 700; margin: 0 0 24px; letter-spacing: -0.01em; }
.py-hero p.lede { font-size: 18px; line-height: 1.6; color: var(--text-soft); margin: 0 auto 32px; max-width: 620px; }
.py-hero__meta { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px 28px; font-size: 13px; font-weight: 600; color: var(--text); margin-bottom: 36px; }
.py-hero__meta .sep { color: oklch(0.8 0.005 260); }
.py-hero__ctas { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* Page hero (non-home pages, left aligned, shorter) */
.py-pagehero { padding: 56px 0 64px; max-width: 780px; }
.py-pagehero h1 { font-size: 42px; line-height: 1.15; font-weight: 700; margin: 0 0 18px; }
.py-pagehero p.lede { font-size: 17px; line-height: 1.6; color: var(--text-soft); margin: 0; }

/* Sections */
.py-section { padding: 64px 0; }
.py-section--tint { background: var(--bg-tint); }
.py-section__head { text-align: center; margin-bottom: 48px; }
.py-section__head.left { text-align: left; }
.py-section__head h2 { font-size: 30px; font-weight: 700; margin: 12px 0 0; }
.py-section__head.left .grad-line { margin: 0 0 16px; }
.py-section__head:not(.left) .grad-line { margin: 0 auto 16px; }

.py-grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.py-grid-5 { display: grid; grid-template-columns: repeat(5, 1fr); gap: 20px; }
.py-grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
@media (max-width: 900px) {
  .py-grid-2, .py-grid-5, .py-grid-3 { grid-template-columns: 1fr; }
  .py-hero h1 { font-size: 34px; }
  .py-pagehero h1 { font-size: 30px; }
}
@media (min-width: 901px) and (max-width: 1200px) {
  .py-grid-5 { grid-template-columns: repeat(3, 1fr); }
}

.py-card-service { padding: 40px; }
.py-card-service .tag { margin-bottom: 20px; }
.py-card-service h3 { font-size: 24px; margin: 0 0 14px; }
.py-card-service p { color: var(--text-soft); line-height: 1.65; margin: 0 0 22px; font-size: 15px; }
.py-card-service .taglist { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 26px; }
.py-card-service .more { font-weight: 600; font-size: 14px; }

.py-why { padding: 26px 20px; text-align: center; }
.py-why svg { margin: 0 auto 14px; display: block; }
.py-why h4 { font-size: 14px; margin: 0 0 8px; }
.py-why p { font-size: 12px; color: var(--text-soft); line-height: 1.55; margin: 0; }

.py-work { padding: 22px; }
.py-work .tag { margin-bottom: 14px; font-size: 10px; }
.py-work__title { font-size: 14px; line-height: 1.4; font-weight: 600; }

/* Publication / list rows */
.py-pub { padding: 28px 0; border-top: 1px solid var(--border); }
.py-pub:last-child { border-bottom: 1px solid var(--border); }
.py-pub__venue { font-size: 12px; font-weight: 700; color: var(--navy); text-transform: uppercase; letter-spacing: 0.04em; margin-bottom: 8px; }
.py-pub__title { font-size: 19px; font-weight: 700; margin: 0 0 8px; }
.py-pub__authors { font-size: 13px; color: var(--text-softer); margin-bottom: 12px; }
.py-pub__desc { font-size: 14px; color: var(--text-soft); line-height: 1.65; margin: 0; }

/* Long-form content (about, service detail) */
.py-prose h2 { font-size: 26px; margin: 0 0 16px; }
.py-prose h3 { font-size: 19px; margin: 32px 0 12px; }
.py-prose p { font-size: 15px; line-height: 1.7; color: var(--text-soft); margin: 0 0 16px; }
.py-prose ul { padding-left: 20px; margin: 0 0 16px; }
.py-prose li { font-size: 15px; line-height: 1.8; color: var(--text-soft); }

/* Stat row */
.py-stats { display: flex; gap: 48px; flex-wrap: wrap; margin: 8px 0 0; }
.py-stat__num { font-size: 32px; font-weight: 700; }
.py-stat__label { font-size: 13px; color: var(--text-soft); }

/* Form */
.py-form { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.py-form .full { grid-column: 1 / -1; }
.py-form label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 6px; }
.py-form input, .py-form select, .py-form textarea {
  width: 100%; padding: 12px 14px; border-radius: 10px; border: 1px solid var(--border);
  font-family: inherit; font-size: 14px; background: #fff; color: var(--text);
}
.py-form input:focus, .py-form select:focus, .py-form textarea:focus { outline: 2px solid var(--navy); outline-offset: 1px; }
.py-form textarea { resize: vertical; min-height: 120px; }
.py-form .hp { position: absolute; left: -9999px; }
@media (max-width: 700px) { .py-form { grid-template-columns: 1fr; } }

.py-notice { padding: 16px 20px; border-radius: 12px; font-size: 14px; margin-bottom: 24px; }
.py-notice--ok { background: oklch(0.95 0.05 150); color: oklch(0.3 0.1 150); }
.py-notice--err { background: oklch(0.95 0.05 30); color: oklch(0.35 0.12 30); }

.py-contact-info { display: flex; flex-direction: column; gap: 24px; }
.py-contact-info__label { font-size: 12px; font-weight: 700; color: var(--text); margin-bottom: 6px; }
.py-contact-info__val { font-size: 15px; color: var(--text-soft); line-height: 1.6; }

/* Footer */
.py-footer { padding: 60px 0 40px; border-top: 1px solid var(--border); margin-top: 40px; }
.py-footer__grid { display: grid; grid-template-columns: 1.2fr 1fr 1fr 1fr; gap: 40px; }
.py-footer img { height: 24px; display: block; margin-bottom: 16px; }
.py-footer p { font-size: 13px; color: var(--text-soft); line-height: 1.6; max-width: 280px; }
.py-footer h5 { font-size: 12px; font-weight: 700; color: oklch(0.3 0.01 260); margin: 0 0 14px; }
.py-footer .col a { display: block; font-size: 14px; margin-bottom: 10px; }
.py-footer .addr { font-size: 13px; color: var(--text-soft); line-height: 1.6; margin-bottom: 12px; }
.py-footer .addr .kicker { font-size: 11px; color: var(--text-softer); }
.py-bottom { padding: 20px 0 40px; font-size: 12px; color: var(--text-softer); }
@media (max-width: 900px) { .py-footer__grid { grid-template-columns: 1fr 1fr; } }