/* ============================================================
   physik-kapitel.css – Styles für PhysikBuch-Kapitel
   Ablage: assets/css/physik-kapitel.css
   ============================================================ */

/* ── Tab-Navigation ──────────────────────────────────────────── */
.rk-tabs {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  border-bottom: 2px solid var(--sl-border);
  margin-bottom: 24px;
  padding-bottom: 0;
}

.rk-tab {
  padding: 8px 16px;
  border: none;
  background: transparent;
  font-family: 'Lexend', sans-serif;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--sl-muted);
  cursor: pointer;
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  transition: all 0.18s ease;
  display: flex;
  align-items: center;
  gap: 6px;
  border-radius: var(--sl-radius-sm) var(--sl-radius-sm) 0 0;
}

.rk-tab:hover {
  color: var(--sl-primary);
  background: var(--sl-primary-light);
}

.rk-tab--aktiv {
  color: var(--sl-primary-dark);
  border-bottom-color: var(--sl-primary);
  background: var(--sl-primary-light);
}

/* ── Theorie ──────────────────────────────────────────────────── */
.rk-sec-head {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: 'Source Serif 4', serif;
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--sl-text);
  margin: 28px 0 12px;
}

.rk-sec-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--sl-primary);
  color: white;
  font-size: 0.75rem;
  font-weight: 800;
  flex-shrink: 0;
}

.rk-text {
  line-height: 1.75;
  margin-bottom: 14px;
  color: var(--sl-text);
}

/* ── Formelbox ────────────────────────────────────────────────── */
.rk-fbox {
  background: var(--sl-primary-light);
  border-left: 4px solid var(--sl-primary);
  border-radius: 0 var(--sl-radius-sm) var(--sl-radius-sm) 0;
  padding: 14px 18px;
  margin: 16px 0;
}

.rk-formel {
  display: block;
  font-family: 'Courier New', monospace;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--sl-primary-dark);
  margin-bottom: 6px;
  letter-spacing: 0.02em;
}

.rk-formel-desc {
  font-size: 0.825rem;
  color: var(--sl-muted);
  line-height: 1.6;
}

/* ── Infobox ──────────────────────────────────────────────────── */
.rk-ibox {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  border-left: 4px solid;
  border-radius: 0 var(--sl-radius-sm) var(--sl-radius-sm) 0;
  padding: 14px 16px;
  margin: 16px 0;
  font-size: 0.9rem;
}

.rk-ibox-ico {
  font-size: 1.25rem;
  flex-shrink: 0;
  margin-top: 1px;
}

.rk-ibox-title {
  font-weight: 700;
  margin-bottom: 4px;
}

.rk-ibox-body {
  line-height: 1.65;
}

/* ── Tabelle ──────────────────────────────────────────────────── */
.rk-table {
  font-size: 0.875rem;
}

.rk-table th {
  background: var(--sl-primary-light);
  color: var(--sl-primary-dark);
}

/* ── Score-Bar ────────────────────────────────────────────────── */
.rk-score-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 12px 16px;
  margin-bottom: 20px;
  font-size: 0.875rem;
  font-weight: 600;
}

/* ── Aufgaben ─────────────────────────────────────────────────── */
.rk-aufgabe {
  margin-bottom: 16px;
  padding: 20px;
}

.rk-auf-head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}

.rk-auf-num {
  font-size: 0.7rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--sl-muted);
  background: var(--sl-bg);
  padding: 3px 8px;
  border-radius: 10px;
}

.rk-auf-titel {
  font-weight: 700;
  font-size: 0.9375rem;
}

.rk-given {
  background: var(--sl-bg);
  border-radius: var(--sl-radius-sm);
  padding: 8px 12px;
  font-size: 0.825rem;
  color: var(--sl-muted);
  margin-bottom: 12px;
  font-family: 'Courier New', monospace;
}

.rk-frage {
  margin-bottom: 16px;
  line-height: 1.7;
}

.rk-input-row {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.rk-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--sl-muted);
  white-space: nowrap;
}

.rk-einheit {
  font-size: 0.875rem;
  color: var(--sl-muted);
  font-weight: 600;
}

.rk-feedback {
  padding: 10px 14px;
  border-radius: var(--sl-radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
  margin-top: 8px;
}

.rk-feedback--ok {
  background: var(--sl-accent-light);
  color: #1a7a53;
  border: 1px solid var(--sl-accent);
}

.rk-feedback--err {
  background: #FEF0F0;
  color: #9b2626;
  border: 1px solid #FFADAD;
}

.rk-steps {
  margin-top: 12px;
  border-top: 1px solid var(--sl-border);
  padding-top: 12px;
}

.rk-step {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  margin-bottom: 8px;
  font-size: 0.875rem;
}

.rk-step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--sl-primary);
  color: white;
  font-size: 0.7rem;
  font-weight: 800;
  flex-shrink: 0;
}

/* ── Drag & Drop ──────────────────────────────────────────────── */
.rk-drag-pool {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 12px;
  background: var(--sl-bg);
  border-radius: var(--sl-radius-sm);
  margin-bottom: 16px;
  min-height: 52px;
}

.rk-drag-item {
  padding: 6px 12px;
  background: var(--sl-surface);
  border: 1.5px solid var(--sl-border);
  border-radius: var(--sl-radius-sm);
  font-size: 0.875rem;
  cursor: grab;
  user-select: none;
  transition: all 0.15s ease;
  font-weight: 600;
}

.rk-drag-item:hover {
  border-color: var(--sl-primary);
  background: var(--sl-primary-light);
}

.rk-drag-item.rk-dragging {
  opacity: 0.4;
  cursor: grabbing;
}

.rk-drag-item.rk-richtig {
  background: var(--sl-accent-light);
  border-color: var(--sl-accent);
  color: #1a7a53;
}

.rk-drag-item.rk-falsch {
  background: #FEF0F0;
  border-color: #FFADAD;
  color: #9b2626;
}

.rk-drag-zones {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
  margin-bottom: 12px;
}

.rk-dz-wrap {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.rk-dz-lbl {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--sl-muted);
}

.rk-dz {
  min-height: 80px;
  padding: 8px;
  border: 2px dashed var(--sl-border);
  border-radius: var(--sl-radius-sm);
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-content: flex-start;
  transition: border-color 0.15s;
}

.rk-dz.rk-dz-over {
  border-color: var(--sl-primary);
  background: var(--sl-primary-light);
}

/* ── Simulation ───────────────────────────────────────────────── */
.sim-wrap {
  background: var(--sl-bg);
  border-radius: var(--sl-radius);
  padding: 16px;
  margin: 12px 0;
}

.sim-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 14px;
}

.sim-ctrl-group {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.sim-ctrl-label {
  font-size: 0.825rem;
  font-weight: 600;
  color: var(--sl-muted);
}

.sim-slider {
  width: 140px;
  accent-color: var(--sl-primary);
}

.sim-val {
  font-size: 0.825rem;
  font-weight: 700;
  color: var(--sl-primary);
  min-width: 60px;
}

canvas {
  max-width: 100%;
  border-radius: var(--sl-radius-sm);
  display: block;
}

/* ── Brücken-CSS für thermisches-verhalten.php ───────────────── */
/* Diese Regeln mappen die alten PhysikBuch-Klassen auf das neue Design */
.ph-title       { font-family: 'Source Serif 4', serif; font-size: 1.75rem; font-weight: 700; margin-bottom: 6px; }
.ph-sub         { color: var(--sl-muted); margin-bottom: 12px; }
.ph-tags        { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 20px; }
.ph-tags .tag   { background: var(--sl-primary-light); color: var(--sl-primary-dark); font-size: 0.8rem; font-weight: 700; padding: 3px 10px; border-radius: 20px; }
.cb             { }
.card           { background: var(--sl-surface); border: 1px solid var(--sl-border); border-radius: var(--sl-radius); padding: 20px; margin: 16px 0; }
.card-title     { font-weight: 700; font-size: 1rem; margin-bottom: 10px; display: flex; align-items: center; gap: 8px; }
.ci             { font-size: 1.2rem; }
.fbox           { background: var(--sl-primary-light); border-left: 4px solid var(--sl-primary); border-radius: 0 var(--sl-radius-sm) var(--sl-radius-sm) 0; padding: 14px 18px; margin: 16px 0; }
.fbox .f        { display: block; font-family: 'Courier New', monospace; font-size: 1.05rem; font-weight: 700; color: var(--sl-primary-dark); margin-bottom: 6px; }
.fbox .fd       { font-size: 0.825rem; color: var(--sl-muted); line-height: 1.6; }
.ibox           { display: flex; gap: 12px; align-items: flex-start; border-left: 4px solid; border-radius: 0 var(--sl-radius-sm) var(--sl-radius-sm) 0; padding: 14px 16px; margin: 16px 0; font-size: 0.9rem; }
.ibox.blue      { background: var(--sl-primary-light); border-left-color: var(--sl-primary); color: var(--sl-primary-dark); }
.ibox.green     { background: var(--sl-accent-light);  border-left-color: var(--sl-accent);  color: #1a7a53; }
.ibox.yellow    { background: var(--sl-warn-light);    border-left-color: var(--sl-warn);    color: #9a6a10; }
.ibox.red       { background: #FEF0F0;                 border-left-color: #FFADAD;           color: #9b2626; }
.ibox-ico       { font-size: 1.25rem; flex-shrink: 0; }
.ibox-t         { font-weight: 700; margin-bottom: 4px; }
.ibox-c         { line-height: 1.65; font-size: 0.875rem; }
.sec-head       { display: flex; align-items: center; gap: 10px; font-family: 'Source Serif 4', serif; font-size: 1.15rem; font-weight: 600; color: var(--sl-text); margin: 28px 0 12px; }
.shn            { display: inline-flex; align-items: center; justify-content: center; width: 26px; height: 26px; border-radius: 50%; background: var(--sl-primary); color: white; font-size: 0.75rem; font-weight: 800; flex-shrink: 0; }
.score-bar      { display: flex; align-items: center; gap: 16px; background: var(--sl-surface); border: 1px solid var(--sl-border); border-radius: var(--sl-radius); padding: 12px 16px; margin-bottom: 20px; }
.score-circle   { position: relative; width: 48px; height: 48px; flex-shrink: 0; }
.score-num      { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; font-size: 0.75rem; font-weight: 800; color: var(--sl-primary); }
.sc-bg          { fill: none; stroke: var(--sl-border); stroke-width: 4; }
.sc-fill        { fill: none; stroke: var(--sl-primary); stroke-width: 4; transform: rotate(-90deg); transform-origin: center; transition: stroke-dashoffset 0.4s ease; }
.score-title    { font-weight: 700; font-size: 0.9rem; }
.score-sub      { font-size: 0.8rem; color: var(--sl-muted); }
.tab-parent     { }
.tabs           { display: flex; gap: 4px; flex-wrap: wrap; border-bottom: 2px solid var(--sl-border); margin-bottom: 24px; }
.tab-btn        { padding: 8px 16px; border: none; background: transparent; font-family: 'Lexend', sans-serif; font-size: 0.875rem; font-weight: 600; color: var(--sl-muted); cursor: pointer; border-bottom: 3px solid transparent; margin-bottom: -2px; transition: all 0.18s ease; border-radius: var(--sl-radius-sm) var(--sl-radius-sm) 0 0; }
.tab-btn:hover  { color: var(--sl-primary); background: var(--sl-primary-light); }
.tab-btn.active { color: var(--sl-primary-dark); border-bottom-color: var(--sl-primary); background: var(--sl-primary-light); }
.tab-content    { display: none; }
.tab-content.active { display: block; }
.ex-wrap        { background: var(--sl-surface); border: 1px solid var(--sl-border); border-radius: var(--sl-radius); padding: 20px; margin-bottom: 16px; }
.ex-head        { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; flex-wrap: wrap; }
.ex-num         { font-size: 0.7rem; font-weight: 800; text-transform: uppercase; letter-spacing: 0.06em; color: var(--sl-muted); background: var(--sl-bg); padding: 3px 8px; border-radius: 10px; }
.ex-title       { font-weight: 700; }
.ex-badge       { font-size: 0.7rem; font-weight: 800; text-transform: uppercase; letter-spacing: 0.04em; padding: 3px 10px; border-radius: 20px; }
.ex-badge.calc  { background: var(--sl-primary-light); color: var(--sl-primary-dark); }
.ex-badge.drag  { background: var(--sl-accent-light);  color: #1a7a53; }
.ex-q           { margin-bottom: 16px; line-height: 1.7; }
.given          { background: var(--sl-bg); border-radius: var(--sl-radius-sm); padding: 8px 12px; font-size: 0.825rem; color: var(--sl-muted); margin: 10px 0; font-family: 'Courier New', monospace; }
.input-row      { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-bottom: 12px; }
.input-row label { font-size: 0.875rem; font-weight: 600; color: var(--sl-muted); }
.calc-input     { padding: 8px 12px; border: 1.5px solid var(--sl-border); border-radius: var(--sl-radius-sm); font-family: 'Lexend', sans-serif; font-size: 0.9375rem; width: 130px; outline: none; }
.calc-input:focus { border-color: var(--sl-primary); box-shadow: 0 0 0 3px rgba(74,127,203,0.15); }
.unit-label     { font-size: 0.875rem; color: var(--sl-muted); font-weight: 600; }
.ex-actions     { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 8px; }
.btn            { display: inline-flex; align-items: center; gap: 6px; padding: 7px 16px; border-radius: var(--sl-radius-sm); font-family: 'Lexend', sans-serif; font-size: 0.8rem; font-weight: 700; cursor: pointer; border: none; transition: all 0.18s ease; }
.btn-primary    { background: var(--sl-primary); color: white; }
.btn-primary:hover { background: var(--sl-primary-dark); }
.btn-secondary  { background: var(--sl-primary-light); color: var(--sl-primary-dark); }
.btn-secondary:hover { background: #d4e5f7; }
.btn-green      { background: var(--sl-accent); color: white; }
.btn-sim-start  { background: var(--sl-accent); color: white; font-size: 0.8rem; font-weight: 700; border: none; padding: 7px 14px; border-radius: var(--sl-radius-sm); cursor: pointer; }
.btn-sim-reset  { background: var(--sl-primary-light); color: var(--sl-primary-dark); font-size: 0.8rem; font-weight: 700; border: none; padding: 7px 14px; border-radius: var(--sl-radius-sm); cursor: pointer; }
.hint-box       { margin-top: 10px; }
.feedback       { margin-top: 10px; padding: 10px 14px; border-radius: var(--sl-radius-sm); font-size: 0.875rem; font-weight: 600; }
.steps-reveal   { margin-top: 12px; border-top: 1px solid var(--sl-border); padding-top: 12px; }
.step           { display: flex; gap: 10px; align-items: flex-start; margin-bottom: 8px; font-size: 0.875rem; }
.step-n         { display: inline-flex; align-items: center; justify-content: center; width: 20px; height: 20px; border-radius: 50%; background: var(--sl-primary); color: white; font-size: 0.7rem; font-weight: 800; flex-shrink: 0; }
.fm             { font-family: 'Courier New', monospace; font-weight: 600; color: var(--sl-primary-dark); }
.drag-ex        { }
.drag-pool      { display: flex; flex-wrap: wrap; gap: 8px; padding: 12px; background: var(--sl-bg); border-radius: var(--sl-radius-sm); margin-bottom: 16px; min-height: 52px; }
.drag-item      { padding: 6px 12px; background: var(--sl-surface); border: 1.5px solid var(--sl-border); border-radius: var(--sl-radius-sm); font-size: 0.875rem; cursor: grab; user-select: none; transition: all 0.15s ease; font-weight: 600; }
.drag-item:hover { border-color: var(--sl-primary); background: var(--sl-primary-light); }
.drag-zones     { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 12px; margin-bottom: 12px; }
.dz-wrap        { display: flex; flex-direction: column; gap: 6px; }
.dz-lbl         { font-size: 0.8rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em; color: var(--sl-muted); }
.dz             { min-height: 80px; padding: 8px; border: 2px dashed var(--sl-border); border-radius: var(--sl-radius-sm); display: flex; flex-wrap: wrap; gap: 6px; align-content: flex-start; transition: border-color 0.15s; }
.phy-list       { padding-left: 22px; margin: 10px 0 14px; line-height: 1.8; }