/* ==========================================================================
   Reverse – Startseite „Code verstehen“
   Ruhige Variante der Designvorlage (design.png): schwarzer Hintergrund,
   anthrazitfarbene Panels, dezente Blau-Akzente statt Rot. Nutzt die Tokens
   aus variables.css; eigene Farben nur für die drei Beleg-Kennzeichnungen.
   ========================================================================== */

:root {
    --rx-max: 1280px;
    --rx-ev-direct: #5fb58a;
    --rx-ev-derived: #a99be6;
    --rx-ev-unknown: #d7a34b;
    --rx-sel-bg: rgba(91, 143, 217, 0.18);
    --rx-line-h: 21px;
}
:root[data-theme="light"] {
    --rx-ev-direct: #2e7d55;
    --rx-ev-derived: #6a55b5;
    --rx-ev-unknown: #93620f;
    --rx-sel-bg: rgba(47, 102, 179, 0.13);
}

html, body.rx-body { height: auto; }
body.rx-body { min-height: 100vh; display: flex; flex-direction: column; font-size: var(--text-md); line-height: 1.6; }

.rx-skip { position: absolute; left: -9999px; top: 8px; z-index: 50; background: var(--color-accent-strong); color: var(--color-on-accent); padding: 8px 12px; border-radius: var(--radius); }
.rx-skip:focus { left: 8px; }

/* ---------- Kopfzeile ---------- */
.rx-top {
    display: flex; align-items: center; justify-content: space-between; gap: var(--space-4);
    padding: 12px max(16px, calc((100vw - var(--rx-max)) / 2)); background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
}
.rx-logo { display: inline-flex; align-items: center; gap: 10px; font-family: var(--font-heading); font-weight: 700; font-size: 22px; color: var(--color-accent); }
.rx-logo:hover { text-decoration: none; color: var(--color-accent-hover); }
.rx-logo .icon { width: 26px; height: 26px; }
.rx-top-nav { display: flex; align-items: center; gap: var(--space-4); font-size: var(--text-sm); }
.rx-top-nav a { color: var(--color-text-muted); }
.rx-top-nav a:hover { color: var(--color-accent); }

.rx-main { flex: 1; width: 100%; max-width: var(--rx-max); margin: 0 auto; padding: var(--space-6) 16px 48px; outline: none; }
.rx-faint { color: var(--color-text-muted); }
.rx-small { font-size: var(--text-sm); }
.rx-warn { color: var(--color-warning); }
.rx-spacer { flex: 1; }
.rx-row { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-3); margin-top: var(--space-3); }
.rx-link { background: none; border: 0; padding: 0; color: var(--color-accent); cursor: pointer; font: inherit; text-decoration: underline; text-underline-offset: 3px; }
.rx-link:hover { color: var(--color-accent-hover); }

/* ---------- Schritt 1: Start ---------- */
.rx-start { max-width: 860px; margin: 0 auto; }
.rx-start h1 { font-size: clamp(28px, 4vw, 38px); margin: var(--space-4) 0 var(--space-2); }
.rx-lead { font-size: var(--text-lg); color: var(--color-text-body); max-width: 680px; margin-bottom: var(--space-5); }
.rx-input { padding: var(--space-4); border: 1px solid transparent; transition: border-color var(--transition-fast); }
.rx-input.is-drag { border-color: var(--color-accent); background: var(--color-accent-softer); }
.rx-code-input {
    width: 100%; min-height: 240px; resize: vertical; display: block;
    font-family: var(--font-mono); font-size: 13px; line-height: 1.55; tab-size: 4;
    background: var(--color-inset); color: var(--color-text); border: 1px solid var(--color-border-subtle);
    border-radius: var(--radius); padding: 14px;
}
.rx-code-input:focus { outline: none; border-color: var(--color-accent); box-shadow: 0 0 0 3px var(--color-accent-soft); }
.rx-code-input::placeholder { color: var(--color-text-faint); }
.rx-files { list-style: none; margin: var(--space-3) 0 0; padding: 0; display: grid; gap: 6px; }
.rx-files:empty { display: none; }
.rx-file { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; background: var(--color-inset); border-radius: var(--radius); padding: 6px 10px; font-size: var(--text-sm); }
.rx-file .icon { color: var(--color-accent); }
.rx-file-name { color: var(--color-text); font-weight: 600; }
.rx-file .btn-icon { margin-left: auto; }
.rx-detect { font-size: var(--text-sm); margin-top: var(--space-2); min-height: 1.4em; }
.rx-detect-row { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; }
.rx-ask { display: inline-flex; flex-wrap: wrap; align-items: center; gap: 6px; }
.rx-ask .select { width: auto; }
.rx-input-actions { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-3); margin-top: var(--space-4); }
.rx-go { font-size: var(--text-md); padding: 10px 20px; }
.rx-hint { font-size: var(--text-sm); color: var(--color-text-muted); }
.rx-hint.is-error { color: var(--color-error); }
.rx-more { display: flex; flex-wrap: wrap; gap: var(--space-2); align-items: center; margin: var(--space-4) 2px; font-size: var(--text-sm); color: var(--color-text-faint); }
.rx-facts { list-style: none; padding: 0; margin: var(--space-6) 0 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--space-4); font-size: var(--text-sm); }
.rx-facts li { display: flex; gap: 10px; color: var(--color-text-muted); }
.rx-facts .icon { flex: none; color: var(--color-accent); margin-top: 3px; }
.rx-facts strong { color: var(--color-text-body); }

/* ---------- Schritt 2: Fortschritt ---------- */
.rx-progress { max-width: 560px; margin: var(--space-6) auto; padding: var(--space-6); outline: none; }
.rx-steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; font-size: var(--text-base); }
.rx-steps li { display: flex; align-items: baseline; gap: 10px; color: var(--color-text-faint); }
.rx-step-dot { width: 10px; height: 10px; border-radius: 50%; border: 2px solid currentColor; flex: none; transform: translateY(1px); }
.rx-steps .rx-step-busy { color: var(--color-text); }
.rx-steps .rx-step-busy .rx-step-dot { border-color: var(--color-accent); background: var(--color-accent-soft); }
.rx-steps .rx-step-ok { color: var(--color-text-body); }
.rx-steps .rx-step-ok .rx-step-dot { background: var(--color-success); border-color: var(--color-success); }
.rx-steps .rx-step-warn .rx-step-dot { background: var(--color-warning); border-color: var(--color-warning); }
.rx-steps .rx-step-error .rx-step-dot { background: var(--color-error); border-color: var(--color-error); }

/* ---------- Ergebnis ---------- */
.rx-result-head { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: var(--space-3); margin-bottom: var(--space-4); }
.rx-result-actions { display: flex; gap: var(--space-2); }
.rx-filetabs { display: flex; gap: 6px; overflow-x: auto; margin-bottom: var(--space-4); padding-bottom: 2px; }
.rx-filetab { display: flex; flex-direction: column; align-items: flex-start; gap: 0; background: var(--color-surface); border: 1px solid var(--color-border-subtle); border-radius: var(--radius); padding: 6px 12px; cursor: pointer; color: var(--color-text-body); white-space: nowrap; }
.rx-filetab[aria-selected="true"] { border-color: var(--color-accent); color: var(--color-text); background: var(--color-accent-softer); }
.rx-grid { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); gap: var(--space-6); align-items: start; }
.rx-explain { min-width: 0; }
.rx-wide { max-width: 860px; }
.rx-explain h2 { font-size: clamp(21px, 2.4vw, 26px); outline: none; }
.rx-explain h3 { font-size: var(--text-lg); margin-top: var(--space-2); }
.rx-explain h4 { font-size: var(--text-md); margin: 0 0 var(--space-2); }
.rx-levels { display: inline-flex; flex-wrap: wrap; gap: 4px; background: var(--color-surface); padding: 4px; border-radius: var(--radius-lg); margin-bottom: var(--space-5); }
.rx-level { background: none; border: 0; padding: 7px 14px; border-radius: var(--radius); color: var(--color-text-muted); cursor: pointer; font-weight: 600; font-size: var(--text-sm); }
.rx-level:hover { color: var(--color-text); }
.rx-level[aria-selected="true"] { background: var(--color-accent-strong); color: var(--color-on-accent); }
.rx-block { margin-bottom: var(--space-6); }
.rx-summary { font-size: var(--text-lg); color: var(--color-text); line-height: 1.65; }
.rx-list { margin: 0; padding-left: 1.2em; display: grid; gap: 6px; }
.rx-limits li::marker { color: var(--rx-ev-unknown); }
.rx-keysteps { margin: 0; padding-left: 1.4em; display: grid; gap: 6px; }
.rx-keystep { background: none; border: 0; padding: 0; text-align: left; color: var(--color-text-body); font: inherit; cursor: pointer; }
.rx-keystep:hover { color: var(--color-accent); text-decoration: underline; text-underline-offset: 3px; }
.rx-chip { display: inline-flex; align-items: center; background: var(--color-accent-softer); color: var(--color-accent); border: 1px solid transparent; border-radius: var(--radius-pill); padding: 0 8px; font-size: var(--text-xs); line-height: 20px; cursor: pointer; white-space: nowrap; vertical-align: 1px; font-family: var(--font-sans); }
.rx-chip:hover { border-color: var(--color-accent); }

/* Beleg-Kennzeichnung */
.rx-ev { display: inline-block; font-size: 10.5px; font-weight: 600; line-height: 1; padding: 3px 6px; border-radius: var(--radius-pill); border: 1px solid currentColor; vertical-align: 2px; white-space: nowrap; letter-spacing: 0.1px; }
.rx-ev.ev-direct { color: var(--rx-ev-direct); }
.rx-ev.ev-derived { color: var(--rx-ev-derived); }
.rx-ev.ev-unknown { color: var(--rx-ev-unknown); }

/* Mitnehmen */
.rx-takeaways { margin: 0; display: grid; gap: 10px; }
.rx-take-item { background: var(--color-surface); border-radius: var(--radius); padding: 10px 14px; border-left: 3px solid var(--color-border-strong); }
.rx-take-insight { border-left-color: var(--color-accent); }
.rx-take-weakness { border-left-color: var(--color-warning); }
.rx-take-item dt { font-size: var(--text-xs); text-transform: uppercase; letter-spacing: 0.6px; color: var(--color-text-muted); font-weight: 700; }
.rx-take-item dd { margin: 2px 0 0; }

/* Frag weiter */
.rx-questions { display: flex; flex-wrap: wrap; gap: 8px; }
.rx-question { background: var(--color-surface); border: 1px solid var(--color-border-strong); color: var(--color-text-body); border-radius: var(--radius-pill); padding: 6px 14px; cursor: pointer; font-size: var(--text-sm); text-align: left; }
.rx-question:hover { border-color: var(--color-accent); color: var(--color-text); }
.rx-question[aria-pressed="true"] { border-color: var(--color-accent); background: var(--color-accent-soft); color: var(--color-text); }
.rx-answer-card { margin-top: var(--space-3); padding: var(--space-4); }
.rx-answer-head { display: flex; align-items: flex-start; justify-content: space-between; gap: var(--space-3); }
.rx-answer-card .rx-list { margin-bottom: var(--space-3); }
.rx-legend { margin-top: var(--space-4); font-size: var(--text-sm); }
.rx-legend summary { cursor: pointer; color: var(--color-text-muted); }

/* Schritt für Schritt */
.rx-chapnav { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; margin-bottom: var(--space-4); }
.rx-chapnav .rx-chip { white-space: normal; text-align: left; line-height: 1.4; padding: 3px 10px; font-size: var(--text-sm); }
.rx-chapter { margin-bottom: var(--space-6); scroll-margin-top: 16px; }
.rx-steplist { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.rx-step { background: var(--color-surface); border-radius: var(--radius); border: 1px solid transparent; }
.rx-step.is-open { border-color: var(--color-accent); }
.rx-step-head { display: flex; align-items: baseline; gap: 10px; width: 100%; background: none; border: 0; text-align: left; padding: 10px 12px; color: var(--color-text-body); cursor: pointer; font: inherit; border-radius: var(--radius); }
.rx-step-head:hover { background: var(--color-surface-elevated); }
.rx-step-no { flex: none; display: inline-grid; place-items: center; width: 24px; height: 24px; border-radius: 50%; background: var(--color-inset); color: var(--color-accent); font-weight: 700; font-size: var(--text-sm); }
.rx-step.is-open .rx-step-no { background: var(--color-accent-strong); color: var(--color-on-accent); }
.rx-step-title { flex: 1; min-width: 0; color: var(--color-text); }
.rx-step-body { padding: 0 14px 12px 46px; font-size: var(--text-base); }
.rx-step-body p { margin-bottom: var(--space-2); }
.rx-branches { display: grid; gap: 6px; margin: var(--space-2) 0; }
.rx-branch { display: grid; grid-template-columns: auto 1fr; gap: 4px 10px; align-items: baseline; background: var(--color-inset); border-radius: var(--radius-sm); padding: 6px 10px; }
.rx-branch-label { font-weight: 700; color: var(--color-accent); font-size: var(--text-sm); white-space: nowrap; }

.rx-substeps { margin: var(--space-2) 0; }
.rx-substeps ol { margin: 4px 0 0; padding-left: 1.4em; display: grid; gap: 6px; }
.rx-subbranches { list-style: none; margin: 4px 0 0; padding: 6px 10px; background: var(--color-inset); border-radius: var(--radius-sm); display: grid; gap: 3px; font-size: var(--text-sm); }
.rx-subbranches strong { color: var(--color-accent); }

/* Technische Details */
.rx-acc { background: var(--color-surface); border-radius: var(--radius); margin-bottom: 8px; }
.rx-acc summary { cursor: pointer; padding: 10px 14px; font-weight: 600; color: var(--color-text); }
.rx-acc-body { padding: 0 14px 12px; display: grid; gap: var(--space-3); }
.rx-detail { border-top: 1px solid var(--color-border-subtle); padding-top: var(--space-3); }
.rx-kv { display: grid; grid-template-columns: max-content 1fr; gap: 4px 12px; margin: 0; font-size: var(--text-sm); }
.rx-kv dt { color: var(--color-text-muted); }
.rx-kv dd { margin: 0; min-width: 0; overflow-wrap: anywhere; }

/* ---------- Codeansicht ---------- */
.rx-codepane { position: sticky; top: 16px; display: flex; flex-direction: column; max-height: calc(100vh - 32px); min-width: 0; overflow: hidden; }
.rx-code-head { display: flex; flex-wrap: wrap; align-items: baseline; gap: 10px; padding: 10px 14px; border-bottom: 1px solid var(--color-border); }
.rx-line-info { font-size: var(--text-sm); color: var(--color-text-muted); padding: 0 14px; }
.rx-line-info:not(:empty) { padding: 8px 14px; border-bottom: 1px solid var(--color-border); }
.rx-code { overflow: auto; flex: 1; min-height: 120px; background: var(--color-inset); font-family: var(--font-mono); font-size: 12.5px; line-height: var(--rx-line-h); padding: 6px 0; outline: none; }
.rx-code:focus-visible { box-shadow: inset 0 0 0 2px var(--color-accent); }
.rx-line { display: flex; min-height: var(--rx-line-h); cursor: pointer; border-left: 3px solid transparent; }
.rx-line:hover { background: rgba(255, 255, 255, 0.035); }
:root[data-theme="light"] .rx-line:hover { background: rgba(0, 0, 0, 0.035); }
.rx-line.is-sel { background: var(--rx-sel-bg); border-left-color: var(--color-accent); }
.rx-line.is-off { opacity: 0.45; }
.rx-line.is-err { background: var(--color-error-soft); border-left-color: var(--color-error); }
.rx-ln { flex: none; width: 3.4em; padding-right: 12px; text-align: right; color: var(--color-text-faint); user-select: none; }
.rx-line.is-sel .rx-ln { color: var(--color-accent); font-weight: 700; }
.rx-src { flex: 1; white-space: pre; padding-right: 14px; color: var(--color-text-body); }

/* ---------- Fußzeile ---------- */
.rx-footer { min-height: 48px; padding: 10px max(16px, calc((100vw - var(--rx-max)) / 2)); }

/* ---------- Responsiv ---------- */
@media (max-width: 900px) {
    .rx-grid { grid-template-columns: minmax(0, 1fr); }
    .rx-codepane { position: static; max-height: 70vh; }
    .rx-facts { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 560px) {
    .rx-main { padding-top: var(--space-4); }
    .rx-top-nav .rx-faint, .rx-theme-label { display: none; }
    .rx-step-body { padding-left: 14px; }
    .rx-go { width: 100%; justify-content: center; }
    .rx-footer { flex-direction: column; align-items: flex-start; gap: 6px; }
    .rx-branch { grid-template-columns: minmax(0, 1fr); }
}
@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto !important; } }