/* 301-Weiterleitung visualisiert: ruhige Schritt-Kästen, Tinte markiert den aktuellen Schritt */

.container{max-width:100%;min-width:0}
.container h1{font-size:20px;margin:0 0 14px;text-wrap:balance}

/* Steuerung */
.button-container{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 22px}
#reset-btn{background:var(--line);color:var(--ink)}
#reset-btn:hover{background:var(--line-strong)}

/* Ablauf */
.visualization{counter-reset:step;display:grid;gap:12px;margin:0 0 26px}
.step{counter-increment:step;display:grid;grid-template-columns:24px minmax(0,1fr) 36px minmax(0,1fr);gap:0 12px;align-items:stretch;min-width:0;
  transition:opacity .45s ease}
/* Noch nicht erreichte Schritte: gedämpft, der Text bleibt aber gut lesbar */
.step:not(.active) .box{background:var(--muted);border-style:dashed}
.step:not(.active) .box strong{color:var(--gray)}
.step:not(.active) .request,.step:not(.active) .response{background:#fff;color:var(--gray)}
.step:not(.active)::before,.step:not(.active) .arrow{opacity:.45}

/* Schrittnummer */
.step::before{content:counter(step);align-self:start;margin-top:11px;width:24px;height:24px;border-radius:50%;display:grid;place-items:center;
  border:1px solid var(--line-strong);background:#fff;color:var(--gray);font-size:12px;font-weight:500;font-variant-numeric:tabular-nums;line-height:1;
  transition:background-color .3s,border-color .3s,color .3s}
.step.active::before{border-color:var(--ink);color:var(--ink)}

/* Kästen */
.box{min-width:0;padding:12px 14px;background:#fff;border:1px solid var(--line);border-radius:12px;font-size:13.5px;line-height:1.5;color:var(--gray);
  transition:border-color .3s,box-shadow .3s}
.box strong{display:flex;align-items:center;gap:7px;margin:0 0 2px;font-size:14.5px;font-weight:500;color:var(--ink)}
.box strong::before{content:"";flex:none;width:15px;height:15px;background:var(--gray-soft);
  -webkit-mask:var(--icon) center/contain no-repeat;mask:var(--icon) center/contain no-repeat}
.browser{--icon:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='none' stroke='%23000' stroke-width='1.4'%3E%3Crect x='1.5' y='2.5' width='13' height='11' rx='2'/%3E%3Cpath d='M1.5 6h13'/%3E%3C/svg%3E")}
.server-original,.server-new{--icon:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='none' stroke='%23000' stroke-width='1.4'%3E%3Crect x='2' y='2' width='12' height='5' rx='1.5'/%3E%3Crect x='2' y='9' width='12' height='5' rx='1.5'/%3E%3Cpath d='M4.8 4.5h1.4M4.8 11.5h1.4'/%3E%3C/svg%3E")}

/* Anfrage und Antwort als Code-Zeilen */
.request,.response{margin-top:8px;padding:7px 9px;background:var(--muted);border:1px solid var(--line);border-radius:8px;
  font-family:var(--mono);font-size:12px;line-height:1.5;color:var(--ink);overflow-wrap:anywhere}
.response>div:first-child{font-weight:500}
.response .header{color:var(--gray)}
#step4 .response>div:first-child{color:var(--ok)}

/* Pfeil zwischen Browser und Server */
.arrow{align-self:center;justify-self:center;font-size:20px;line-height:1;color:var(--gray-soft);transition:color .3s}

/* Aktueller Schritt: letzter aktiver Schritt */
.step.active:not(:has(~ .step.active))::before{background:var(--ink);border-color:var(--ink);color:#fff}
.step.active:not(:has(~ .step.active)) .box{border-color:var(--ink);box-shadow:0 1px 2px rgba(17,17,17,.06)}
.step.active:not(:has(~ .step.active)) .arrow{color:var(--ink)}

/* Erklärung */
.explanation{padding:20px 22px;background:var(--muted);border:1px solid var(--line);border-radius:var(--radius)}
.explanation h2{font-size:17px;margin:0 0 12px}
.explanation h3{font-size:15px;margin:20px 0 10px}
.explanation ol,.explanation ul{margin:0;font-size:14.5px;line-height:1.55}
.explanation ol{padding-left:22px}
.explanation ol li{margin:0 0 8px;padding-left:4px}
.explanation ol li::marker{color:var(--gray);font-weight:500;font-variant-numeric:tabular-nums}
.explanation ul{list-style:none;padding:0;display:grid;gap:9px}
.explanation ul li{position:relative;margin:0;padding-left:30px}
.explanation ul li::before{content:"";position:absolute;left:0;top:2px;width:20px;height:20px;border-radius:50%;
  background:var(--ink) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12' fill='none' stroke='%23fff' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m2.6 6.3 2.2 2.2 4.6-4.9'/%3E%3C/svg%3E") center/10px no-repeat}
.explanation li:last-child{margin-bottom:0}

/* Handy: Browser und Server untereinander, Pfeile zeigen nach unten oder oben */
@media (max-width:480px){
  .container h1{font-size:18px}
  .button-container button{flex:1 1 auto}
}
@media (max-width:620px){
  .visualization{gap:16px}
  .step{grid-template-columns:24px minmax(0,1fr);gap:6px 10px}
  .step::before{grid-row:1}
  .step .box,.step .arrow{grid-column:2}
  .arrow{transform:rotate(90deg);font-size:18px;padding:0 1px}
  .explanation{padding:16px 16px}
}