/* RevFlow Intelligence Hub — app.css */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --bg:      #f4f5f7;
  --surface: #ffffff;
  --border:  #dde0e8;
  --text:    #1a1c2e;
  --muted:   #6b6e80;
  --accent:  #3b5bdb;
  --radius:  6px;
  --shadow:  0 1px 4px rgba(0,0,0,.08);
  --nav-h:   52px;
  --max-w:   920px;
}
body { background: var(--bg); color: var(--text); font: 15px/1.6 system-ui, -apple-system, sans-serif; }

/* Nav */
.rf-nav { background: var(--text); min-height: var(--nav-h); position: sticky; top: 0; z-index: 10; }
.rf-nav-inner { max-width: 1200px; margin: 0 auto; padding: 0 20px; min-height: var(--nav-h); display: flex; align-items: center; gap: 32px; flex-wrap: wrap; }
.rf-nav-brand { font-weight: 700; font-size: 15px; color: #fff; text-decoration: none; letter-spacing: .02em; }
.rf-nav-links { display: flex; gap: 20px; flex-wrap: wrap; }
.rf-nav-links a { color: rgba(255,255,255,.65); text-decoration: none; font-size: 14px; }
.rf-nav-links a:hover { color: #fff; }

/* Main — listing pages */
main { max-width: var(--max-w); margin: 0 auto; padding: 36px 20px 80px; }
/* Main — artifact pages (wider) */
main.rf-artifact-main { max-width: 1280px; padding-top: 24px; }

/* Page header */
.rf-page-header { margin-bottom: 36px; }
.rf-page-header h1 { font-size: 26px; font-weight: 700; margin-bottom: 6px; }
.rf-page-header p  { color: var(--muted); font-size: 15px; }

/* Section block (homepage) */
.rf-section-block { margin-bottom: 48px; }
.rf-section-block h2 { font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: .1em; color: var(--muted); margin-bottom: 16px; padding-bottom: 8px; border-bottom: 1px solid var(--border); }
.rf-section-all { display: inline-block; font-size: 12px; color: var(--accent); text-decoration: none; margin-top: 12px; }
.rf-section-all:hover { text-decoration: underline; }

/* Card grid */
.rf-card-grid { display: grid; gap: 14px; }
@media (min-width: 620px) { .rf-card-grid { grid-template-columns: repeat(2, 1fr); } }

/* Card */
.rf-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow); text-decoration: none; color: inherit; display: block; transition: box-shadow .15s; }
.rf-card:hover { box-shadow: 0 4px 14px rgba(0,0,0,.12); }
.rf-card-title   { font-size: 15px; font-weight: 600; margin-bottom: 3px; }
.rf-card-label   { font-size: 12px; color: var(--accent); font-weight: 500; margin-bottom: 8px; }
.rf-card-summary { font-size: 14px; color: var(--muted); line-height: 1.5; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.rf-card-section { font-size: 11px; background: var(--bg); border: 1px solid var(--border); border-radius: 3px; padding: 2px 7px; color: var(--muted); margin-top: 10px; display: inline-block; }

/* Artifact list (section pages) */
.rf-artifact-list { display: grid; gap: 14px; }
.rf-artifact-item { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow); }
.rf-artifact-item h3 { font-size: 16px; font-weight: 600; margin-bottom: 4px; }
.rf-artifact-item h3 a { color: var(--text); text-decoration: none; }
.rf-artifact-item h3 a:hover { color: var(--accent); }
.rf-artifact-item .rf-meta { font-size: 12px; color: var(--muted); margin-bottom: 8px; }
.rf-artifact-item .rf-summary { font-size: 14px; color: var(--muted); }

/* Breadcrumb */
.rf-breadcrumb { font-size: 13px; color: var(--muted); margin-bottom: 24px; }
.rf-breadcrumb a { color: var(--accent); text-decoration: none; }
.rf-breadcrumb a:hover { text-decoration: underline; }
.rf-breadcrumb span { margin: 0 6px; }

/* 404 */
.rf-error-page { text-align: center; padding: 100px 20px; }
.rf-error-page h1 { font-size: 72px; font-weight: 700; color: var(--border); }
.rf-error-page p  { color: var(--muted); margin: 12px 0 24px; }
.rf-error-page a  { color: var(--accent); }

/* Injected artifact wrapper — transparent, no double-box; report's own styles show */
.rf-artifact-body { background: transparent; border: none; border-radius: 0; padding: 0; margin-top: 8px; box-shadow: none; }

/* Footer */
.rf-footer { max-width: var(--max-w); margin: 0 auto; padding: 20px; border-top: 1px solid var(--border); color: var(--muted); font-size: 12px; }
main.rf-artifact-main ~ .rf-footer { max-width: 1280px; }

/* ── Responsive ── */
@media (max-width: 600px) {
  .rf-nav-inner { padding: 8px 14px; gap: 10px; }
  .rf-nav-brand { font-size: 13px; }
  .rf-nav-links a { font-size: 12px; }
  .rf-nav-links { gap: 12px; }
}
@media (max-width: 420px) {
  main { padding: 20px 12px 60px; }
  .rf-page-header h1 { font-size: 20px; }
  .rf-card-grid { grid-template-columns: 1fr; }
}