/* ============================================================
   ZIA/ZPA MIGRATION FIELD GUIDE — KAIWAI.TECH
   Self-contained dark "field notes" design system.
   No external fonts / libraries.
   ============================================================ */

:root{
  --bg:#0a0c10;
  --bg-raise:#0f1116;
  --panel:#131419;
  --panel2:#181a20;
  --line:#2a2c34;
  --line-soft:#1e2027;
  --text:#f2f2ee;
  --muted:#9394a0;
  --muted-dim:#63646e;
  --accent:#5ee6c9;
  --accent-ink:#0a0c10;
  --amber:#ffb84d;
  --danger:#ff6b6b;
  --ok:#6fe0a3;
  --info:#6fb7ff;
  --purple:#c3a6ff;
  --max:1240px;
  --mono:"JetBrains Mono","SFMono-Regular","Courier New",monospace;
  --sans:Inter,ui-sans-serif,system-ui,-apple-system,"Hiragino Kaku Gothic ProN","Yu Gothic",Meiryo,sans-serif;
  --radius:3px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:var(--sans);
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  line-height:1.6;
}
a{color:inherit}
button{font:inherit;color:inherit}
h1,h2,h3{font-family:var(--sans);font-weight:900;letter-spacing:-.03em;margin:0}
p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
::selection{background:var(--accent);color:var(--accent-ink)}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important}
}

.wrap{width:min(calc(100% - 32px),var(--max));margin:auto}

.noc-bg{
  position:fixed;inset:0;z-index:-1;pointer-events:none;
  background-image:
    linear-gradient(to right, rgba(255,255,255,.03) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,.03) 1px, transparent 1px);
  background-size:40px 40px;
  mask-image:radial-gradient(ellipse 90% 60% at 50% 0%, #000 40%, transparent 100%);
}

/* ---------- disclaimer / header ---------- */
.disclaimer-bar{
  background:#171213;
  border-bottom:1px solid #332328;
  color:#e8c8ce;
  font:11px/1.7 var(--mono);
  padding:10px 0;
}
.disclaimer-bar b{color:var(--accent)}
.disclaimer-bar .wrap{display:flex;gap:10px;align-items:flex-start}

.topbar{
  position:sticky;top:0;z-index:40;
  background:rgba(10,12,16,.9);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.topbar-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:14px 0}
.brand-group{display:flex;align-items:center;gap:10px;min-width:0}
.brand{font-weight:900;font-size:15px;letter-spacing:-.03em;text-decoration:none;white-space:nowrap}
.brand-sep{color:var(--muted-dim);font-size:12px}
.brand-sub{font:11px var(--mono);letter-spacing:.1em;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.back{font-size:12px;color:var(--muted);text-decoration:none;white-space:nowrap}
.back:hover,.back:focus-visible{color:var(--text)}
.nav-toggle{
  display:none;border:1px solid var(--line);background:var(--panel);color:var(--text);
  padding:8px 12px;font:11px var(--mono);letter-spacing:.1em;cursor:pointer;border-radius:var(--radius);
}

.stage-nav{position:sticky;top:0;z-index:35;background:var(--panel);border-bottom:1px solid var(--line);overflow-x:auto;scrollbar-width:thin}
.stage-nav-inner{display:flex;gap:0;width:max-content;min-width:100%}
.stage-chip{
  display:flex;align-items:center;gap:8px;flex:none;
  padding:10px 16px;border-right:1px solid var(--line-soft);
  font:11px var(--mono);letter-spacing:.06em;color:var(--muted);text-decoration:none;white-space:nowrap;
}
.stage-chip:hover,.stage-chip:focus-visible{color:var(--text);background:var(--panel2)}
.stage-chip.is-active{color:var(--accent-ink);background:var(--accent)}
.stage-chip.is-active .chip-no{color:var(--accent-ink);opacity:.6}
.chip-no{color:var(--muted-dim);font-weight:700}

/* ---------- typography helpers ---------- */
.section-label{font:11px var(--mono);letter-spacing:.14em;color:var(--accent);margin-bottom:12px}
.stage-lead{font-size:15px;line-height:1.85;color:#d7d8d4;max-width:760px;margin-top:10px}
.callout-strong{
  margin-top:26px;padding:18px 20px;border:1px solid var(--accent);background:rgba(94,230,201,.07);
  font-size:17px;font-weight:800;letter-spacing:-.01em;border-radius:var(--radius);
}
.callout-strong.soft{font-size:14px;font-weight:600;border-color:var(--line);background:var(--panel2);color:#d7d8d4}

/* ---------- hero ---------- */
.fg-hero{padding:88px 5vw 60px}
.kicker{font:11px var(--mono);letter-spacing:.14em;color:var(--muted);margin-bottom:22px}
h1{font-size:clamp(44px,6.6vw,92px);line-height:.96;letter-spacing:-.045em}
.fg-hero-lead{margin-top:22px;font-size:17px;line-height:1.9;color:#d7d8d4;max-width:660px}
.hero-callout{
  margin-top:34px;padding:20px 24px;border:1px solid var(--line);background:var(--panel);
  border-left:3px solid var(--accent);border-radius:var(--radius);max-width:720px;
}
.hero-callout p{font-size:16px;font-weight:700;letter-spacing:-.005em;line-height:1.7}
.scope-strip{display:flex;flex-wrap:wrap;gap:1px;background:var(--line);border:1px solid var(--line);margin-top:44px;max-width:900px}
.scope-chip-static{flex:1 1 220px;background:var(--panel);padding:14px 16px;font:10px var(--mono);letter-spacing:.06em;color:var(--muted)}
.scope-chip-static b{display:block;margin-top:5px;color:var(--text);font-family:var(--sans);font-weight:700;font-size:13px;letter-spacing:0}

/* ---------- sections ---------- */
.fg-section{padding:70px 0;border-top:1px solid var(--line);scroll-margin-top:60px}
.fg-section h2{font-size:clamp(26px,3.2vw,40px);margin-top:6px}

/* ---------- checklist ---------- */
.checklist-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:1px;background:var(--line);border:1px solid var(--line);margin-top:20px}
.check-item{display:flex;align-items:center;gap:12px;background:var(--panel);padding:14px 16px;font-size:13px;cursor:pointer}
.check-item.is-critical{border-left:3px solid var(--amber)}
.check-item input{width:16px;height:16px;accent-color:var(--accent);flex:none}
.check-item em{display:inline-block;margin-left:8px;font:10px var(--mono);color:var(--amber);font-style:normal}
.readiness-banner{margin-top:20px;padding:16px 18px;border-radius:var(--radius);font-weight:800;font-size:14px}
.readiness-banner.ok{background:rgba(111,224,163,.1);border:1px solid var(--ok);color:var(--ok)}
.readiness-banner.danger{background:rgba(255,107,107,.1);border:1px solid var(--danger);color:var(--danger)}

/* ---------- tables ---------- */
.table-wrap{overflow-x:auto;margin-top:22px;border:1px solid var(--line);border-radius:var(--radius)}
.data-table{width:100%;border-collapse:collapse;font-size:13px;min-width:720px}
.data-table th{
  text-align:left;padding:12px 14px;background:var(--panel2);
  font:10px var(--mono);letter-spacing:.08em;color:var(--muted);border-bottom:1px solid var(--line);white-space:nowrap;
}
.data-table td{padding:12px 14px;border-bottom:1px solid var(--line-soft);vertical-align:top}
.data-table tr:last-child td{border-bottom:0}
.data-table tr:hover td{background:rgba(255,255,255,.02)}

/* ---------- pill ---------- */
.pill{display:inline-block;padding:4px 10px;font:11px var(--mono);letter-spacing:.04em;border-radius:99px;border:1px solid transparent}
.pill.ok{background:rgba(111,224,163,.12);color:var(--ok);border-color:rgba(111,224,163,.35)}
.pill.warn{background:rgba(255,184,77,.12);color:var(--amber);border-color:rgba(255,184,77,.35)}
.pill.danger{background:rgba(255,107,107,.12);color:var(--danger);border-color:rgba(255,107,107,.35)}
.pill.info{background:rgba(111,183,255,.12);color:var(--info);border-color:rgba(111,183,255,.35)}
.pill.muted{background:var(--panel2);color:var(--muted);border-color:var(--line)}

/* ---------- decision grid (ssl) ---------- */
.decision-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:1px;background:var(--line);border:1px solid var(--line);margin-top:22px}
.decision-card{background:var(--panel);padding:20px}
.decision-id{font:11px var(--mono);color:var(--purple);letter-spacing:.06em}
.decision-card h3{font-size:16px;margin-top:8px;font-weight:700;letter-spacing:0}
.decision-card p{font-size:13px;color:#d7d8d4;margin-top:10px;line-height:1.75}

/* ---------- timeline ---------- */
.timeline{display:flex;flex-wrap:wrap;gap:1px;background:var(--line);border:1px solid var(--line);margin-top:24px}
.tl-item{flex:1 1 130px;background:var(--panel);padding:18px 14px;display:flex;flex-direction:column;gap:8px}
.tl-range{font:10px var(--mono);letter-spacing:.06em;color:var(--accent)}
.tl-label{font-size:14px;font-weight:700}
.tl-item p{font-size:12px;color:var(--muted);line-height:1.6}

/* ---------- pitfalls (accordion) ---------- */
.pitfall-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:1px;background:var(--line);border:1px solid var(--line);margin-top:24px}
.pitfall-card{background:var(--panel)}
.pitfall-card summary{list-style:none;cursor:pointer;padding:18px;font-weight:800;font-size:15px;display:flex;align-items:center}
.pitfall-card summary::-webkit-details-marker{display:none}
.pitfall-card summary::before{content:"⚠";margin-right:12px;color:var(--amber)}
.pitfall-card summary::after{content:"+";margin-left:auto;color:var(--muted)}
.pitfall-card[open] summary::after{content:"–"}
.pitfall-body{padding:0 18px 18px;display:grid;gap:12px}
.pitfall-body p{font-size:13px;color:#d7d8d4;line-height:1.75}

/* ---------- severity grid (rollback) ---------- */
.sev-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line);margin-top:24px}
.sev-card{background:var(--panel);padding:18px}
.sev-card b{font:900 16px var(--mono)}
.sev-card span{display:block;font-size:13px;font-weight:700;margin-top:6px}
.sev-card p{font-size:12px;color:var(--muted);margin-top:8px;line-height:1.7}
.sev-card.danger b{color:var(--danger)}
.sev-card.warn b{color:var(--amber)}
.sev-card.info b{color:var(--info)}
.sev-card.muted b{color:var(--muted)}

/* ---------- glossary ---------- */
.glossary-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line);margin-top:22px}
.glossary-card{background:var(--panel);padding:16px 18px}
.glossary-card b{font-size:15px;font-family:var(--mono);color:var(--accent)}
.glossary-full{display:block;font-size:11px;color:var(--muted-dim);margin-top:4px}
.glossary-card p{font-size:12px;color:#d7d8d4;margin-top:10px;line-height:1.7}

/* ---------- related ---------- */
.related-section{background:var(--bg-raise)}
.related-inner{display:flex;justify-content:space-between;align-items:center;gap:24px;flex-wrap:wrap}
.related-links{display:flex;flex-direction:column;gap:10px;flex:none}
.related-link-btn{
  border:1px solid var(--accent);background:var(--accent);color:var(--accent-ink);
  padding:14px 22px;font:800 13px var(--mono);letter-spacing:.05em;text-decoration:none;border-radius:var(--radius);
  white-space:nowrap;text-align:center;
}
.related-link-btn:hover,.related-link-btn:focus-visible{filter:brightness(1.08)}
.related-link-btn.alt{background:transparent;color:var(--text);border-color:var(--line)}
.related-link-btn.alt:hover,.related-link-btn.alt:focus-visible{border-color:var(--accent)}

/* ---------- footer ---------- */
.fg-footer{border-top:1px solid var(--line);padding:50px 0 60px;background:var(--bg-raise)}
.fg-footer-inner{display:grid;gap:18px;max-width:760px}
.fg-footer-brand{display:flex;gap:12px;font:12px var(--mono);letter-spacing:.06em;color:var(--muted)}
.fg-footer-brand span:first-child{color:var(--text);font-weight:700}
.fg-footer-disclaimer{font-size:12px;color:var(--muted-dim);line-height:1.8}

/* ---------- focus ---------- */
a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{
  outline:2px solid var(--accent);outline-offset:2px;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width:1024px){
  .decision-grid,.glossary-grid{grid-template-columns:repeat(2,1fr)}
  .sev-grid{grid-template-columns:repeat(2,1fr)}
}

@media (max-width:760px){
  .topbar-inner{flex-wrap:wrap}
  .nav-toggle{display:block}
  .stage-nav-inner{display:none;flex-direction:column;width:100%}
  .stage-nav-inner.is-open{display:flex}
  .stage-chip{border-right:0;border-bottom:1px solid var(--line-soft)}
  .fg-hero{padding:56px 6vw 44px}
  .fg-section{padding:50px 0}
  .checklist-grid,.decision-grid,.pitfall-grid,.sev-grid,.glossary-grid{grid-template-columns:1fr}
  .related-inner{flex-direction:column;align-items:flex-start}
  .related-links{width:100%}
  .related-link-btn{width:100%}
}