/* xAPI Statement Validator — CI design system tokens */
:root {
  --navy: #1D2D44; --navy-light: #2A3D55; --amber: #F2B249; --amber-hover: #E0A23F;
  --ice: #E4F1F6;
  --ink: #1D2D44; --muted: #6C829D; --line: #E7E9ED; --canvas: #F6F7F9; --card: #FFFFFF;
  --error: #E74C3C; --warn: #E8913A; --info: #5B9BD5; --good: #27AE60;
  --error-soft: #FDECEA; --warn-soft: #FDF4E0; --info-soft: #E6F0FA; --good-soft: #E7F6EC;
  --radius: 14px; --shadow: 0 2px 16px rgba(29,45,68,0.08);
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--canvas); color: var(--ink);
  font-family: "Satoshi", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.55;
}
code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; background: rgba(29,45,68,0.06); padding: 1px 5px; border-radius: 5px; font-size: 0.85em; }
a { color: var(--info); }

.site-head { height: 56px; display: flex; align-items: center; padding: 0 24px; border-bottom: 1px solid var(--line); background: #fff; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; cursor: pointer; }
.brand-logo { width: 36px; height: 36px; border-radius: 50%; }
.brand-name { font-weight: 700; font-size: 15px; letter-spacing: -0.01em; color: var(--navy); }
.head-back { margin-left: auto; font-size: 14px; font-weight: 500; color: var(--muted); text-decoration: none; }
.head-back:hover { color: var(--navy); }

main { max-width: 820px; margin: 0 auto; padding: 0 20px 64px; }

.hero { text-align: center; padding: 56px 0 20px; }
.hero h1 { font-size: 40px; line-height: 1.1; margin: 0 0 12px; color: var(--navy); letter-spacing: -0.02em; }
.hero .sub { font-size: 18px; color: var(--muted); max-width: 600px; margin: 0 auto; }

/* Editor */
.editor { margin-top: 24px; }
textarea#input {
  width: 100%; min-height: 300px; resize: vertical;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 13px; line-height: 1.55;
  padding: 18px; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; color: var(--ink);
  box-shadow: var(--shadow); outline: none; tab-size: 2;
}
textarea#input:focus { border-color: var(--amber); }
textarea#input::placeholder { color: #AEB9C7; }

.actions { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; margin-top: 14px; }
.btn-validate {
  background: var(--amber); color: var(--navy); font-weight: 700; border: none; cursor: pointer;
  padding: 11px 22px; border-radius: 10px; font-size: 15px; transition: background .12s;
}
.btn-validate:hover { background: var(--amber-hover); }
.btn-text { background: none; border: none; color: var(--info); cursor: pointer; font: inherit; font-size: 14px; padding: 6px 4px; }
.btn-text:hover { text-decoration: underline; }
.actions .spacer { flex: 1; }
.kbd-hint { font-size: 12.5px; color: var(--muted); }
.kbd-hint kbd { font-family: ui-monospace, monospace; font-size: 11px; background: rgba(29,45,68,0.06); border: 1px solid var(--line); border-radius: 4px; padding: 1px 5px; }

/* Results */
.result-head { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; margin-top: 28px; }
.result-badge { display: inline-block; font-weight: 700; font-size: 14px; padding: 7px 16px; border-radius: 999px; }
.result-badge.good { background: var(--good-soft); color: #1a7f4f; }
.result-badge.warn { background: var(--warn-soft); color: #9a6a12; }
.result-badge.bad  { background: var(--error-soft); color: #b3271a; }
.result-summary { font-size: 14px; color: var(--muted); }
.result-summary code { font-size: 12.5px; }

.panel { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 8px 22px; box-shadow: var(--shadow); margin-top: 14px; }
.check-list { list-style: none; margin: 0; padding: 0; }
.check { display: flex; gap: 14px; padding: 16px 0; border-top: 1px solid var(--line); }
.check:first-child { border-top: none; }
.check .ci { flex: 0 0 22px; height: 22px; width: 22px; border-radius: 50%; display: grid; place-items: center; color: #fff; font-size: 12px; font-weight: 700; margin-top: 1px; }
.check.error .ci   { background: var(--error); }
.check.warning .ci { background: var(--warn); }
.check.info .ci    { background: var(--info); }
.check.ok .ci      { background: var(--good); }
.check-body { flex: 1; min-width: 0; }
.ctitle { font-weight: 600; font-size: 15px; display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.path { font-family: ui-monospace, monospace; font-size: 11.5px; font-weight: 600; color: var(--info); background: var(--info-soft); padding: 2px 7px; border-radius: 5px; }
.cdetail { color: var(--muted); font-size: 13.5px; margin-top: 4px; line-height: 1.45; }
.cfix { font-size: 13.5px; margin-top: 6px; line-height: 1.45; }
.cfix strong { color: var(--navy); }

/* Upsell */
.upsell { margin-top: 16px; padding: 20px 22px; border-radius: var(--radius); background: linear-gradient(135deg, var(--navy), var(--navy-light)); color: #fff; }
.upsell h3 { margin: 0 0 8px; font-size: 18px; }
.upsell em { font-style: normal; color: var(--amber); }
.upsell p { margin: 0 0 14px; color: #D7DEE8; font-size: 14.5px; }
.btn-primary { display: inline-block; background: var(--amber); color: var(--navy); font-weight: 700; text-decoration: none; padding: 9px 16px; border-radius: 9px; font-size: 14px; }

/* SEO content */
.content { margin-top: 48px; max-width: 760px; }
.content h2 { color: var(--navy); font-size: 22px; margin: 36px 0 12px; }
.content ul { padding-left: 20px; }
.content li { margin: 7px 0; line-height: 1.5; }
.content details { border: 1px solid var(--line); border-radius: 10px; padding: 12px 16px; margin: 8px 0; background: #fff; }
.content summary { font-weight: 600; cursor: pointer; }
.content details p { margin: 8px 0 0; color: var(--muted); }

@media (max-width: 560px) {
  .hero h1 { font-size: 32px; }
}