/* case-study mode */
:root{--ink:#eef4fa;--ink-2:#b4c0ce;--ink-3:#7f8da0;--accent:#5fe1ff;--mint:#5ff2c3;--red:#ff8a7a;--mono:"JetBrains Mono",ui-monospace,monospace}
*{box-sizing:border-box}

.wrap{max-width:900px}
a{color:var(--accent)}
.tag{font:500 10.5px var(--mono);letter-spacing:.3em;text-transform:uppercase;color:var(--ink-3)}
header{padding:64px 0 10px}
h1{font-size:clamp(36px,6.5vw,68px);font-weight:200;letter-spacing:-.04em;line-height:1;margin:16px 0 0;color:var(--ink)}
h1 b{font-weight:600;background:linear-gradient(100deg,#5fe1ff,#9b7bff 60%,#ff8fd8);-webkit-background-clip:text;background-clip:text;color:transparent}
.sub{font-size:clamp(16px,2.1vw,19px);margin:20px 0 0;max-width:62ch}
.answer{margin:28px 0 0;padding:20px 22px;border-radius:18px;border:1px solid #2a3a50;background:rgba(12,19,30,.7);backdrop-filter:blur(10px)}
.answer b{color:var(--ink)}
.meta{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}.meta span{font:500 11px var(--mono);padding:6px 11px;border-radius:99px;border:1px solid #1f2a38;color:var(--ink-2)}
/* the stepper: six CRISP-DM steps, one at a time */
.steps{display:flex;gap:6px;margin:44px 0 0;overflow-x:auto;scrollbar-width:none}.steps::-webkit-scrollbar{display:none}
.steps button{flex:1;min-width:120px;text-align:left;background:rgba(12,19,30,.6);border:1px solid #1f2a38;border-radius:12px;padding:10px 12px;color:var(--ink-3);font:500 11px var(--mono);letter-spacing:.06em;cursor:pointer}
.steps button b{display:block;font:600 13.5px "Plus Jakarta Sans",sans-serif;color:var(--ink-2);letter-spacing:0;margin-top:2px}
.steps button[aria-current="step"]{border-color:var(--accent);background:rgba(95,225,255,.08)}.steps button[aria-current="step"] b{color:var(--ink)}
.prog{height:2px;background:rgba(95,225,255,.12);margin:10px 0 0;border-radius:2px;overflow:hidden}.prog i{display:block;height:100%;background:linear-gradient(90deg,#5fe1ff,#9b7bff);transition:width .4s}
.step{display:none;margin-top:22px;padding:26px 24px;border-radius:20px;border:1px solid #1f2a38;background:linear-gradient(165deg,rgba(18,28,42,.82),rgba(12,19,30,.62));backdrop-filter:blur(10px)}
.step.on{display:block;animation:in .35s ease}
@keyframes in{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.step h2{font-size:clamp(22px,3.4vw,30px);font-weight:400;letter-spacing:-.02em;color:var(--ink);margin:0 0 12px}
.step h3{font:600 11px var(--mono);letter-spacing:.18em;text-transform:uppercase;color:var(--accent);margin:22px 0 8px}
.step ul{margin:0;padding-left:20px}.step li{margin:0 0 8px}.step li b{color:var(--ink)}
.nav{display:flex;justify-content:space-between;gap:10px;margin-top:22px}
.nav button{background:rgba(18,28,42,.7);border:1px solid #2a3a50;color:var(--ink);border-radius:12px;padding:11px 18px;font:600 12px var(--mono);letter-spacing:.06em;cursor:pointer}
.nav button.pri{background:linear-gradient(100deg,#5fe1ff,#9b7bff);color:#05080e;border:0}
.nav button:disabled{opacity:.35;cursor:default}
/* the margin bridge */
.bridge{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:10px;align-items:end;height:220px;margin:16px 0 8px;padding:0 4px;border-bottom:1px solid #3d4a5c}
.bridge div{position:relative;display:flex;flex-direction:column;justify-content:flex-end;height:100%}
.bridge i{display:block;border-radius:6px 6px 0 0;opacity:.85}.bridge .g{background:var(--mint)}.bridge .r{background:var(--red)}.bridge .n{background:#9aa6b6}
.bridge b{font:600 13px var(--mono);color:var(--ink);text-align:center;margin-bottom:6px}
.bl{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:10px;font-size:12px;text-align:center;color:var(--ink-3);line-height:1.35}
.code{font:12.5px/1.6 var(--mono);background:#05080e;border:1px solid #1f2a38;border-radius:12px;padding:14px 16px;overflow-x:auto;color:#cfe6f2;white-space:pre}
.kv{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin-top:10px}.kv div{padding:14px;border-radius:14px;border:1px solid #1f2a38;background:rgba(5,8,14,.5)}
.kv b{display:block;font:500 22px var(--mono);color:var(--ink)}.kv span{font-size:12.5px;color:var(--ink-3)}
footer{margin-top:44px;font:500 11px var(--mono);color:var(--ink-3);display:flex;flex-wrap:wrap;gap:10px 24px;justify-content:space-between}
@media (max-width:620px){.kv{grid-template-columns:1fr 1fr}.bridge{height:180px;gap:6px}.bl{gap:6px;font-size:11px}.step{padding:20px 16px}}
@media (prefers-reduced-motion:reduce){.step.on{animation:none}}

.answer{font-size:16px}