/* Echo Pathways — marketing site.
   Reads ONLY the custom properties in tokens.css (generated from config/product.json).
   No brand literal belongs in this file: a rebrand must not require touching it. */

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--c-body);
  background: var(--c-background);
  -webkit-font-smoothing: antialiased;
}

img, svg { max-width: 100%; height: auto; display: block; }
a { color: var(--c-link); text-decoration-thickness: 1px; text-underline-offset: 2px; }
:focus-visible { outline: none; box-shadow: var(--ring); border-radius: 4px; }

h1, h2, h3 { font-family: var(--font-serif); color: var(--c-on-surface); line-height: 1.15; margin: 0; font-weight: 500; }
h1 { font-size: clamp(2.2rem, 1.4rem + 3.2vw, 4rem); letter-spacing: -0.02em; }
h2 { font-size: clamp(1.7rem, 1.2rem + 1.9vw, 2.7rem); letter-spacing: -0.015em; }
h3 { font-size: 1.15rem; letter-spacing: -0.005em; }
p { margin: 0; }

/* ---- layout ------------------------------------------------------------- */
.wrap { width: 100%; max-width: 1180px; margin-inline: auto; padding-inline: 24px; }
.section { padding-block: clamp(56px, 8vw, 112px); border-top: 1px solid var(--c-border); }
.section--alt { background: var(--c-surface-alt); }
.section--dark { background: var(--c-surface-inverse); border-top: 0; }
.section--dark, .section--dark p, .section--dark li { color: var(--c-on-inverse); }
.section--dark h1, .section--dark h2, .section--dark h3 { color: var(--c-on-inverse); }
.section--dark .eyebrow { color: var(--gold-400); }
.section--dark .lede { color: color-mix(in srgb, var(--c-on-inverse) 78%, transparent); }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-muted);
  margin-bottom: 18px;
}
.lede { font-size: clamp(1.02rem, 0.96rem + 0.3vw, 1.2rem); color: var(--c-muted); max-width: 60ch; }
.section > .wrap > .lede { margin-top: 20px; }
.measure { max-width: 68ch; }

.grid { display: grid; gap: 24px; }
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.grid--4 { grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); }
.stack > * + * { margin-top: 20px; }

/* ---- header / nav ------------------------------------------------------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--c-background) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--c-border);
}
.site-header .wrap { display: flex; align-items: center; gap: 28px; min-height: 68px; }
.brand { display: flex; align-items: center; gap: 10px; font-family: var(--font-serif); font-size: 1.16rem; color: var(--c-on-surface); text-decoration: none; letter-spacing: -0.01em; }
.brand__logo { height: 30px; width: auto; display: block; flex: none; }
.nav { display: flex; gap: 22px; margin-left: auto; align-items: center; flex-wrap: wrap; }
.nav a { color: var(--c-muted); text-decoration: none; font-size: 0.92rem; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--c-on-surface); }
.nav a[aria-current="page"] { text-decoration: underline; text-underline-offset: 5px; text-decoration-color: var(--c-accent); }
@media (max-width: 860px) {
  .site-header .wrap { flex-wrap: wrap; padding-block: 12px; }
  .nav { margin-left: 0; width: 100%; gap: 16px; }
}

/* ---- buttons ------------------------------------------------------------ */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 20px; border-radius: var(--radius);
  font-size: 0.94rem; font-weight: 500; text-decoration: none;
  border: 1px solid transparent; cursor: pointer; white-space: nowrap;
  transition: background-color .15s ease, border-color .15s ease;
}
.btn--primary { background: var(--c-primary); color: var(--c-on-primary); }
.btn--primary:hover { background: var(--pine-600); }
.btn--ghost { border-color: var(--c-border-strong); color: var(--c-on-surface); background: transparent; }
.btn--ghost:hover { background: var(--c-surface-alt); }
.btn--on-dark { background: var(--c-accent); color: var(--pine-900); }
.btn--on-dark:hover { background: var(--gold-400); }
.btn--ghost-on-dark { border-color: color-mix(in srgb, var(--c-on-inverse) 34%, transparent); color: var(--c-on-inverse); }
.btn--ghost-on-dark:hover { background: color-mix(in srgb, var(--c-on-inverse) 10%, transparent); }
.btn-row { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 32px; }

/* ---- hero (1b: dark pine split) ----------------------------------------- */
.hero { background: var(--c-surface-inverse); color: var(--c-on-inverse); border-bottom: 1px solid var(--pine-600); }
.hero .wrap { display: grid; grid-template-columns: 1.05fr 1fr; gap: clamp(32px, 5vw, 72px); align-items: center; padding-block: clamp(56px, 8vw, 104px); }
.hero h1 { color: var(--c-on-inverse); }
.hero .lede { color: color-mix(in srgb, var(--c-on-inverse) 80%, transparent); margin-top: 24px; font-size: 1.12rem; }
.hero .eyebrow { color: var(--gold-400); }
@media (max-width: 900px) { .hero .wrap { grid-template-columns: 1fr; } }

.hero__meta { margin-top: 40px; display: flex; align-items: center; gap: 14px; flex-wrap: wrap; font-family: var(--font-mono); font-size: 0.76rem; color: color-mix(in srgb, var(--c-on-inverse) 62%, transparent); }
.hero__meta .chip { border: 1px solid color-mix(in srgb, var(--c-on-inverse) 24%, transparent); border-radius: 999px; padding: 4px 12px; }

/* ---- alert card (the product's signature object) ------------------------ */
.alert-card {
  background: var(--c-surface); border-radius: 12px; padding: 20px;
  border: 1px solid var(--c-border); box-shadow: 0 18px 50px rgba(0,0,0,.28);
}
.alert-card__head { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.badge { font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: .1em; text-transform: uppercase; padding: 4px 9px; border-radius: 5px; font-weight: 600; }
.badge--high { background: var(--c-severity-high-bg); color: var(--c-severity-high-text); }
.badge--medium { background: var(--c-severity-medium-bg); color: var(--c-severity-medium-text); }
.badge--low { background: var(--c-severity-low-bg); color: var(--c-severity-low); }
.badge--gov { background: var(--violet-100); color: var(--violet-600); }
.alert-card__title { font-family: var(--font-serif); font-size: 1.06rem; color: var(--c-on-surface); }
.alert-card__body { font-size: 0.9rem; color: var(--c-body); }
.alert-card__body code { font-family: var(--font-mono); font-size: 0.84em; background: var(--c-surface-alt); padding: 1px 5px; border-radius: 4px; }
.provenance { margin-top: 16px; padding-top: 14px; border-top: 1px dashed var(--c-border-strong); display: grid; gap: 6px; font-family: var(--font-mono); font-size: 0.75rem; color: var(--c-muted); }
.provenance b { color: var(--c-body); font-weight: 500; }

/* ---- steps -------------------------------------------------------------- */
.step { border-top: 2px solid var(--c-accent); padding-top: 18px; }
.step__n { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: .12em; text-transform: uppercase; color: var(--c-muted); margin-bottom: 10px; }
.step p { color: var(--c-muted); font-size: 0.93rem; margin-top: 8px; }

/* ---- cards -------------------------------------------------------------- */
.card { background: var(--c-surface); border: 1px solid var(--c-border); border-radius: var(--radius); padding: 24px; }
.card p { color: var(--c-muted); font-size: 0.93rem; margin-top: 8px; }
.card--illus { padding: 0; overflow: hidden; }
.card--illus img { width: 100%; aspect-ratio: 16/10; object-fit: cover; }
.card--illus .card__text { padding: 20px 24px 24px; }

/* two-column list: what AI does vs what the rules do */
.split-claim { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-top: 40px; }
@media (max-width: 780px) { .split-claim { grid-template-columns: 1fr; } }
.claim { border-radius: var(--radius); padding: 24px; border: 1px solid var(--c-border); background: var(--c-surface); }
.claim--rules { border-color: var(--c-accent); background: var(--gold-100); }
.claim h3 { font-family: var(--font-mono); font-size: 0.74rem; letter-spacing: .12em; text-transform: uppercase; color: var(--c-muted); font-weight: 600; }
.claim ul { list-style: none; padding: 0; margin: 16px 0 0; display: grid; gap: 12px; }
.claim li { position: relative; padding-left: 22px; font-size: 0.93rem; color: var(--c-body); }
.claim li::before { content: ""; position: absolute; left: 0; top: 9px; width: 8px; height: 8px; border-radius: 50%; background: var(--c-border-strong); }
.claim--rules li::before { background: var(--c-accent); }

/* ---- screenshot slots --------------------------------------------------- */
.shot { margin: 0; }
.shot__frame {
  position: relative; border-radius: 10px; overflow: hidden;
  border: 1px solid var(--c-border-strong); background: var(--c-surface-alt);
  box-shadow: 0 12px 40px rgba(18,48,44,.10);
}
.section--dark .shot__frame, .hero .shot__frame { box-shadow: 0 24px 60px rgba(0,0,0,.34); border-color: var(--pine-600); }
.shot__chrome {
  display: flex; align-items: center; gap: 8px;
  padding: 9px 12px; background: var(--c-surface);
  border-bottom: 1px solid var(--c-border);
  font-family: var(--font-mono); font-size: 0.72rem; color: var(--c-faint);
}
.shot__dots { display: flex; gap: 5px; }
.shot__dots i { width: 9px; height: 9px; border-radius: 50%; background: var(--c-border-strong); }
.shot__frame img { width: 100%; display: block; background: var(--c-surface); }
/* Placeholder: shown behind the <img>. If the screenshot file is missing the img
   collapses and this reads as an explicit empty slot rather than a broken page. */
.shot__frame::after {
  content: attr(data-slot);
  position: absolute; inset: 33px 0 0 0; z-index: -1;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono); font-size: 0.78rem; color: var(--c-faint);
  background: repeating-linear-gradient(45deg, var(--c-surface-alt) 0 10px, var(--c-surface) 10px 20px);
}
.shot figcaption { margin-top: 14px; font-size: 0.88rem; color: var(--c-muted); max-width: 62ch; }
.section--dark .shot figcaption { color: color-mix(in srgb, var(--c-on-inverse) 68%, transparent); }

/* before/after inbox comparison */
.compare { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; margin-top: 44px; align-items: start; }
@media (max-width: 900px) { .compare { grid-template-columns: 1fr; } }
.compare__label { font-family: var(--font-mono); font-size: 0.74rem; letter-spacing: .12em; text-transform: uppercase; color: var(--c-muted); margin-bottom: 14px; }
.inbox { border: 1px solid var(--c-border); border-radius: var(--radius); background: var(--c-surface); overflow: hidden; }
.inbox__row { display: flex; gap: 12px; padding: 11px 16px; border-bottom: 1px solid var(--c-border); font-size: 0.85rem; color: var(--c-muted); align-items: baseline; }
.inbox__row:last-child { border-bottom: 0; }
.inbox__row span { margin-left: auto; font-family: var(--font-mono); font-size: 0.72rem; color: var(--c-faint); white-space: nowrap; }
.inbox__row--hot { background: var(--c-severity-high-bg); color: var(--c-severity-high-text); font-weight: 500; }

/* ---- logos / integration ------------------------------------------------ */
.logo-row { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 32px; }
.logo-chip { border: 1px solid var(--c-border-strong); border-radius: 999px; padding: 9px 20px; font-family: var(--font-mono); font-size: 0.8rem; color: var(--c-body); background: var(--c-surface); }

/* ---- callout / notice --------------------------------------------------- */
.notice { border-left: 3px solid var(--c-accent); background: var(--gold-100); padding: 20px 24px; border-radius: 0 var(--radius) var(--radius) 0; }
.notice--gov { border-color: var(--c-governance); background: var(--violet-100); }
.notice--todo { border-color: var(--c-danger); background: var(--c-severity-high-bg); }
.notice p { font-size: 0.93rem; color: var(--c-body); }
.notice h3 { margin-bottom: 8px; font-size: 1rem; }

/* ---- legal / long-form prose ------------------------------------------- */
.prose { max-width: 74ch; }
.prose h2 { font-size: 1.5rem; margin-top: 52px; padding-top: 24px; border-top: 1px solid var(--c-border); }
.prose h2:first-of-type { margin-top: 36px; }
.prose h3 { margin-top: 28px; font-family: var(--font-sans); font-size: 1rem; font-weight: 600; }
.prose p, .prose ul, .prose ol { margin-top: 14px; color: var(--c-body); font-size: 0.97rem; }
.prose ul, .prose ol { padding-left: 22px; }
.prose li + li { margin-top: 8px; }
.prose dt { font-weight: 600; margin-top: 16px; color: var(--c-on-surface); }
.prose dd { margin: 4px 0 0; color: var(--c-muted); }
.prose table { width: 100%; border-collapse: collapse; margin-top: 18px; font-size: 0.9rem; }
.prose :is(th, td) { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--c-border); vertical-align: top; }
.prose th { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: .08em; text-transform: uppercase; color: var(--c-muted); font-weight: 600; }
.table-scroll { overflow-x: auto; }
.meta-line { font-family: var(--font-mono); font-size: 0.78rem; color: var(--c-muted); margin-top: 12px; }

/* ---- footer ------------------------------------------------------------- */
.site-footer { background: var(--pine-900); color: var(--c-on-inverse); padding-block: 64px 32px; }
.site-footer a { color: color-mix(in srgb, var(--c-on-inverse) 74%, transparent); text-decoration: none; font-size: 0.9rem; }
.site-footer a:hover { color: var(--c-on-inverse); }
.site-footer .grid { gap: 32px; }
.site-footer h4 { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: .12em; text-transform: uppercase; color: var(--gold-400); margin: 0 0 14px; font-weight: 600; }
.site-footer ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.site-footer__brand p { color: color-mix(in srgb, var(--c-on-inverse) 62%, transparent); font-size: 0.9rem; margin-top: 12px; max-width: 34ch; }
.site-footer__bottom {
  margin-top: 48px; padding-top: 24px;
  border-top: 1px solid color-mix(in srgb, var(--c-on-inverse) 16%, transparent);
  display: flex; gap: 16px; flex-wrap: wrap; align-items: center;
  font-size: 0.82rem; color: color-mix(in srgb, var(--c-on-inverse) 56%, transparent);
}
.site-footer__bottom .spacer { margin-left: auto; }
.sister { display: inline-flex; align-items: center; gap: 8px; border: 1px solid color-mix(in srgb, var(--c-on-inverse) 22%, transparent); border-radius: 999px; padding: 6px 14px; }
.sister:hover { border-color: var(--c-accent); }

/* the regulatory line sits in the footer of every page — it is not a marketing claim */
.reg-line {
  margin-top: 28px; padding: 16px 20px; border-radius: var(--radius);
  border: 1px solid color-mix(in srgb, var(--c-on-inverse) 20%, transparent);
  font-size: 0.82rem; line-height: 1.5;
  color: color-mix(in srgb, var(--c-on-inverse) 70%, transparent);
}
.reg-line b { color: var(--c-on-inverse); font-weight: 600; }
.reg-line__link { color: var(--gold-400); white-space: nowrap; }

.skip-link { position: absolute; left: -9999px; }
.skip-link:focus { left: 16px; top: 12px; z-index: 100; background: var(--c-surface); color: var(--c-on-surface); padding: 10px 16px; border-radius: var(--radius); }