/* ============================================================
   style.css — Dark, glowing, debugger-inspired theme.
   ============================================================ */

:root {
  --bg: #0b0d14;
  --bg-alt: #10131d;
  --panel: #151926;
  --panel-2: #1b2032;
  --border: #262c40;
  --text: #e8ecf7;
  --text-dim: #8a91ab;
  --accent: #6fd7ff;
  --accent-2: #b18aff;
  --green: #5be89a;
  --yellow: #ffd166;
  --red: #ff6b6b;
  --code-font: "Cascadia Code", "Fira Code", Consolas, "Courier New", monospace;
  --ui-font: "Segoe UI", system-ui, -apple-system, sans-serif;
  --radius: 14px;
  --glow: 0 0 0 1px rgba(111, 215, 255, 0.15), 0 0 24px rgba(111, 215, 255, 0.08);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: radial-gradient(1200px 800px at 20% -10%, #171d33 0%, var(--bg) 55%);
  color: var(--text);
  font-family: var(--ui-font);
  font-size: 16px;
  min-height: 100vh;
}

button { font-family: inherit; }

.hidden { display: none !important; }

/* ---------------------------------------------------- top bar */
.topbar {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 14px 24px;
  background: rgba(16, 19, 29, 0.9);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(8px);
}

.brand {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.3px;
  display: flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
}
.brand span { background: linear-gradient(90deg, var(--accent), var(--accent-2)); -webkit-background-clip: text; background-clip: text; color: transparent; }

.lesson-nav {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.nav-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--panel);
  color: var(--text-dim);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 8px 16px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  transition: all 0.2s ease;
}
.nav-btn:hover { color: var(--text); border-color: var(--accent); }
.nav-btn.active {
  color: #06121a;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  border-color: transparent;
  box-shadow: 0 0 18px rgba(111, 215, 255, 0.35);
}
.nav-icon { font-size: 16px; }

.lesson-intro {
  max-width: 1400px;
  margin: 16px auto 0;
  padding: 12px 20px;
  color: var(--text-dim);
  font-size: 15px;
}

/* ---------------------------------------------------- layout */
.app-main {
  max-width: 1400px;
  margin: 0 auto;
  padding: 8px 24px 48px;
}

.sim-view {
  display: grid;
  grid-template-columns: 1.15fr 1fr 1fr;
  gap: 18px;
  align-items: start;
}

.panel {
  background: linear-gradient(180deg, var(--panel), var(--panel-2));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--glow);
}

.panel-title {
  margin: 0 0 12px;
  font-size: 15px;
  letter-spacing: 0.3px;
  color: var(--text-dim);
  text-transform: uppercase;
  font-weight: 700;
}

/* ---------------------------------------------------- instructions */
.instr-list {
  list-style: none;
  margin: 0;
  padding: 0;
  max-height: 420px;
  overflow-y: auto;
  font-family: var(--code-font);
  font-size: 14.5px;
}

.instr-line {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 10px;
  border-radius: 8px;
  border: 1px solid transparent;
  color: var(--text-dim);
  transition: background 0.25s, border-color 0.25s, transform 0.2s;
}
.instr-line.done { color: #565e78; }
.instr-line.active {
  color: var(--text);
  background: rgba(111, 215, 255, 0.1);
  border-color: rgba(111, 215, 255, 0.4);
  box-shadow: inset 0 0 0 1px rgba(111, 215, 255, 0.15), 0 0 16px rgba(111, 215, 255, 0.15);
  transform: translateX(2px);
}
.instr-line.is-gadget { border-left: 3px solid var(--accent-2); }
.instr-line.instr-firing { animation: firing 0.5s ease; }
.instr-line.instr-retaddr { box-shadow: 0 0 0 2px var(--yellow) inset, 0 0 18px rgba(255, 209, 102, 0.4); }

@keyframes firing {
  0% { background: rgba(111, 215, 255, 0.35); }
  100% { background: rgba(111, 215, 255, 0.1); }
}

.panel-title-row { display: flex; align-items: center; justify-content: space-between; gap: 10px; flex-wrap: wrap; }
.panel-title-actions { display: flex; align-items: center; gap: 12px; }
.predict-toggle { display: flex; align-items: center; gap: 6px; font-size: 12px; color: var(--text-dim); cursor: pointer; user-select: none; }
.predict-toggle input { accent-color: var(--accent); }

.edit-code-btn {
  background: var(--bg-alt);
  color: var(--accent);
  border: 1px solid rgba(111, 215, 255, 0.4);
  border-radius: 8px;
  padding: 5px 10px;
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s;
}
.edit-code-btn:hover { box-shadow: 0 0 10px rgba(111, 215, 255, 0.3); }

/* ---------------------------------------------------- sandbox editor */
.asm-editor-panel { display: flex; flex-direction: column; gap: 10px; }
.asm-editor {
  width: 100%;
  min-height: 320px;
  resize: vertical;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
  color: var(--text);
  font-family: var(--code-font);
  font-size: 13.5px;
  line-height: 1.6;
  outline: none;
  tab-size: 2;
}
.asm-editor:focus { border-color: var(--accent); box-shadow: 0 0 14px rgba(111, 215, 255, 0.25); }

.asm-errors {
  background: rgba(255, 107, 107, 0.1);
  border: 1px solid rgba(255, 107, 107, 0.4);
  border-radius: 8px;
  padding: 8px 12px;
  font-size: 12.5px;
  color: var(--red);
}
.asm-errors div { padding: 2px 0; font-family: var(--code-font); }

.asm-cheatsheet { font-size: 12.5px; color: var(--text-dim); }
.asm-cheatsheet summary { cursor: pointer; font-weight: 700; color: var(--accent); padding: 4px 0; }
.asm-cheat-list { display: grid; grid-template-columns: 1fr; gap: 4px; margin-top: 8px; }
.asm-cheat-row { display: flex; gap: 10px; padding: 3px 0; border-bottom: 1px dashed var(--border); }
.asm-cheat-mnem { font-family: var(--code-font); color: var(--accent-2); width: 60px; flex-shrink: 0; font-weight: 700; }

.sim-view.sandbox-idle .panel-center,
.sim-view.sandbox-idle .panel-stack {
  opacity: 0.4;
  pointer-events: none;
  filter: saturate(0.5);
  transition: opacity 0.3s, filter 0.3s;
}

.predict-banner {
  margin: 6px 0 10px;
  padding: 10px 12px;
  border-radius: 10px;
  background: rgba(255, 209, 102, 0.1);
  border: 1px solid rgba(255, 209, 102, 0.4);
  color: var(--yellow);
  font-size: 13.5px;
  font-weight: 600;
  animation: slotIn 0.25s ease;
}

.instr-line.predict-pickable { cursor: pointer; border-color: rgba(255, 209, 102, 0.5); }
.instr-line.predict-pickable:hover { background: rgba(255, 209, 102, 0.12); transform: translateX(2px); }
.instr-line.predict-correct { animation: cardFlash 0.8s ease; border-color: var(--green) !important; }
.instr-line.predict-wrong { animation: cardFlashRed 0.8s ease; border-color: var(--red) !important; }

.instr-no { color: #4c5573; width: 18px; text-align: right; flex-shrink: 0; }
.instr-text { white-space: pre; }
.instr-label { margin-left: auto; color: var(--accent-2); font-size: 12px; }

/* ---------------------------------------------------- gadget panel */
.gadget-panel { margin-top: 18px; border-top: 1px dashed var(--border); padding-top: 14px; }
.gadget-panel h3 { margin: 14px 0 8px; font-size: 13px; color: var(--text-dim); text-transform: uppercase; }
.gadget-panel h3:first-child { margin-top: 0; }

.gadget-101 {
  background: rgba(111, 215, 255, 0.06);
  border: 1px solid rgba(111, 215, 255, 0.2);
  border-radius: 10px;
  padding: 10px 12px;
}
.gadget-101 p { margin: 0 0 8px; font-size: 12.5px; color: var(--text-dim); line-height: 1.5; }
.gadget-101 p:last-child { margin-bottom: 0; }
.gadget-101 code { color: var(--accent); font-family: var(--code-font); }

.gadget-list { display: flex; flex-direction: column; gap: 6px; }
.gadget-card {
  background: rgba(177, 138, 255, 0.08);
  border: 1px solid rgba(177, 138, 255, 0.3);
  border-radius: 10px;
  padding: 8px 12px;
  transition: box-shadow 0.3s, border-color 0.3s, background 0.3s;
}
.gadget-card-head { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.gadget-step {
  font-size: 10.5px;
  font-weight: 800;
  color: #06121a;
  background: var(--accent-2);
  border-radius: 999px;
  padding: 1px 7px;
}
.gadget-effect {
  margin-left: auto;
  font-size: 10.5px;
  font-weight: 700;
  color: var(--green);
  background: rgba(91, 232, 154, 0.12);
  border: 1px solid rgba(91, 232, 154, 0.4);
  border-radius: 6px;
  padding: 1px 6px;
}
.gadget-card code { font-family: var(--code-font); color: var(--accent-2); font-size: 13px; }
.gadget-card p { margin: 4px 0 0; font-size: 12.5px; color: var(--text-dim); }
.gadget-card.active {
  border-color: var(--yellow);
  background: rgba(255, 209, 102, 0.14);
  box-shadow: 0 0 16px rgba(255, 209, 102, 0.35);
}
.gadget-arrow { text-align: center; font-size: 11px; color: #565e78; }

/* ---------------------------------------------------- registers */
.reg-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 16px;
}

.reg-card {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  text-align: center;
  transition: box-shadow 0.3s, border-color 0.3s;
}
.reg-card.is-rip { border-color: var(--yellow); }
.reg-card.is-rsp { border-color: var(--green); }
.reg-card.is-rbp { border-color: var(--accent-2); }

.reg-name { font-size: 12px; font-weight: 700; letter-spacing: 0.6px; color: var(--text-dim); }
.reg-value {
  font-family: var(--code-font);
  font-size: 13.5px;
  margin-top: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.reg-tag { font-size: 10px; color: #565e78; margin-top: 2px; }

.reg-card.flash, .flag-chip.flash, .instr-line.flash {
  animation: cardFlash 0.7s ease;
}
.flash-red { animation: cardFlashRed 0.7s ease !important; }
.flash-jump { animation: cardFlashJump 0.7s ease !important; }

@keyframes cardFlash {
  0% { box-shadow: 0 0 0 2px var(--accent), 0 0 24px rgba(111, 215, 255, 0.6); background: rgba(111, 215, 255, 0.12); }
  100% { box-shadow: none; }
}
@keyframes cardFlashRed {
  0% { box-shadow: 0 0 0 2px var(--red), 0 0 24px rgba(255, 107, 107, 0.7); background: rgba(255, 107, 107, 0.18); }
  100% { box-shadow: none; }
}
@keyframes cardFlashJump {
  0%, 40% { box-shadow: 0 0 0 2px var(--yellow), 0 0 26px rgba(255, 209, 102, 0.7); }
  100% { box-shadow: none; }
}

/* ---------------------------------------------------- flags */
.flags-block h3, .mem-map h3 { font-size: 13px; color: var(--text-dim); text-transform: uppercase; margin: 0 0 8px; }
.flags-row { display: flex; gap: 10px; margin-bottom: 16px; }
.flag-chip {
  flex: 1;
  text-align: center;
  padding: 8px;
  border-radius: 8px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  font-family: var(--code-font);
  font-size: 13px;
  color: var(--text-dim);
}
.flag-chip small { display: block; font-size: 10px; color: #565e78; }
.flag-chip.set { color: var(--yellow); border-color: var(--yellow); box-shadow: 0 0 12px rgba(255, 209, 102, 0.25); }

/* ---------------------------------------------------- explain box */
.explain-box {
  background: rgba(111, 215, 255, 0.06);
  border: 1px solid rgba(111, 215, 255, 0.25);
  border-radius: 10px;
  padding: 12px 14px;
  margin-bottom: 16px;
  min-height: 70px;
}
.explain-current { font-family: var(--code-font); color: var(--accent); font-size: 13.5px; margin-bottom: 4px; }
.explain-text { font-size: 14.5px; }
.explain-story { font-size: 13px; color: var(--text-dim); margin-top: 6px; border-top: 1px dashed var(--border); padding-top: 6px; }

/* ---------------------------------------------------- memory map */
.mem-strip { display: flex; gap: 6px; height: 40px; }
.mem-seg {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  color: var(--text-dim);
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 8px;
  transition: all 0.3s;
}
.mem-seg.active { color: #06121a; background: linear-gradient(90deg, var(--accent), var(--accent-2)); box-shadow: 0 0 14px rgba(111, 215, 255, 0.4); font-weight: 700; }

/* ---------------------------------------------------- controls */
.controls { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 16px; }
.ctrl-btn {
  background: var(--bg-alt);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 13.5px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}
.ctrl-btn:hover:not(:disabled) { border-color: var(--accent); box-shadow: 0 0 12px rgba(111, 215, 255, 0.25); transform: translateY(-1px); }
.ctrl-btn:disabled { opacity: 0.35; cursor: not-allowed; }
.ctrl-primary { background: linear-gradient(90deg, var(--accent), var(--accent-2)); color: #06121a; border-color: transparent; }

.speed-row { display: flex; align-items: center; gap: 10px; margin-top: 12px; font-size: 12.5px; color: var(--text-dim); }
.speed-row input { flex: 1; accent-color: var(--accent); }

/* ---------------------------------------------------- stack panel */
.stack-wrap { position: relative; display: flex; min-height: 420px; }
.arrow-rail { position: relative; width: 54px; flex-shrink: 0; }
.ptr-arrow {
  position: absolute;
  top: 0; left: 0;
  transform: translateY(0);
  transition: transform 0.4s cubic-bezier(.4,0,.2,1);
  font-size: 10.5px;
  font-weight: 800;
  padding: 3px 6px;
  border-radius: 6px;
  white-space: nowrap;
}
.rsp-arrow { color: #06121a; background: var(--green); box-shadow: 0 0 10px rgba(91, 232, 154, 0.6); margin-top: 2px; }
.rbp-arrow { color: #06121a; background: var(--accent-2); box-shadow: 0 0 10px rgba(177, 138, 255, 0.6); margin-top: 26px; }

.stack-track {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-height: 440px;
  overflow-y: auto;
  padding-right: 4px;
}

.stack-slot {
  border-radius: 9px;
  padding: 8px 10px;
  border: 1px solid var(--border);
  background: var(--bg-alt);
  font-family: var(--code-font);
  transition: transform 0.25s, opacity 0.25s;
}
.slot-label { font-size: 10.5px; text-transform: uppercase; letter-spacing: 0.4px; color: var(--text-dim); }
.slot-value { font-size: 14px; margin-top: 2px; }
.slot-addr { font-size: 10px; color: #565e78; margin-top: 2px; }

.slot-retaddr { border-color: rgba(255, 209, 102, 0.5); background: rgba(255, 209, 102, 0.08); }
.slot-savedrbp { border-color: rgba(177, 138, 255, 0.5); background: rgba(177, 138, 255, 0.08); }
.slot-local, .slot-buffer { border-color: rgba(111, 215, 255, 0.35); background: rgba(111, 215, 255, 0.05); }
.slot-value.slot-value { border-color: var(--border); }

.stack-slot.corrupted { border-color: var(--red) !important; background: rgba(255, 107, 107, 0.15) !important; }
.stack-slot.corrupted .slot-value { color: var(--red); font-weight: 700; }

.stack-slot.slot-enter { animation: slotIn 0.35s ease; }
.stack-slot.slot-exit { animation: slotOut 0.28s ease forwards; }
@keyframes slotIn { from { opacity: 0; transform: translateY(-10px) scale(0.94); } to { opacity: 1; transform: none; } }
@keyframes slotOut { to { opacity: 0; transform: translateY(-8px) scale(0.9); } }

/* fly-ghost — the element that physically travels between two spots */
.fly-ghost {
  position: fixed;
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--code-font);
  font-size: 13px;
  font-weight: 700;
  color: #06121a;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  border-radius: 8px;
  box-shadow: 0 6px 24px rgba(111, 215, 255, 0.5);
  opacity: 1;
  pointer-events: none;
}
.fly-ghost.ghost-code { background: linear-gradient(90deg, var(--yellow), #ffb066); }
.fly-ghost.ghost-down { border-radius: 999px; }
.fly-ghost.ghost-up { border-radius: 999px; }

/* ---------------------------------------------------- lab views (shared card chrome) */
.lab-view { display: flex; justify-content: center; }
.lab-card {
  width: 100%;
  max-width: 980px;
  background: linear-gradient(180deg, var(--panel), var(--panel-2));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--glow);
}
.lab-copy { color: var(--text-dim); font-size: 15px; margin: 0 0 18px; }
.lab-copy code { color: var(--accent); font-family: var(--code-font); }

.of-toolbar { display: flex; gap: 10px; flex-wrap: wrap; margin: 14px 0; }

/* ---------------------------------------------------- buffer overflow lab */
.of-input {
  width: 100%;
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg-alt);
  color: var(--text);
  font-family: var(--code-font);
  font-size: 15px;
  outline: none;
}
.of-input:focus { border-color: var(--accent); box-shadow: 0 0 14px rgba(111, 215, 255, 0.3); }

.of-count { margin-top: 8px; font-size: 13px; color: var(--text-dim); }

.of-zone-labels { display: flex; margin-top: 14px; border-radius: 8px; overflow: hidden; }
.of-zone-tag { text-align: center; font-size: 10.5px; padding: 5px 2px; color: #06121a; font-weight: 700; }
.of-zone-tag.zone-buffer { background: var(--accent); }
.of-zone-tag.zone-savedrbp { background: var(--accent-2); }
.of-zone-tag.zone-retaddr { background: var(--yellow); }
.of-zone-tag.zone-beyond { background: #565e78; color: var(--text); }

.of-grid {
  display: grid;
  grid-template-columns: repeat(16, 1fr);
  gap: 4px;
  margin-top: 6px;
}
.of-cell {
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 5px;
  border: 1px solid var(--border);
  background: var(--bg-alt);
  font-family: var(--code-font);
  font-size: 12px;
  color: var(--text-dim);
  transition: background 0.2s, border-color 0.2s;
}
.of-cell.zone-buffer.filled { border-color: var(--accent); color: var(--text); }
.of-cell.zone-savedrbp.filled { border-color: var(--accent-2); color: var(--text); }
.of-cell.zone-retaddr.filled { border-color: var(--yellow); color: var(--text); }
.of-cell.zone-beyond.filled { border-color: #565e78; color: var(--text); }
.of-cell.corrupted { background: rgba(255, 107, 107, 0.25); border-color: var(--red); color: #ffdada; }
.of-cell.slot-pop-in { animation: slotIn 0.25s ease; }

.of-status { min-height: 22px; margin-top: 14px; font-size: 14px; font-weight: 600; }
.of-status.warn { color: var(--yellow); }
.of-status.danger { color: var(--red); }
.of-status.ok { color: var(--green); }

.rip-box {
  margin-top: 18px;
  padding: 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg-alt);
  text-align: center;
}
.rip-box .rip-name { font-size: 11px; color: var(--text-dim); text-transform: uppercase; }
.rip-box .rip-value { font-family: var(--code-font); font-size: 20px; margin-top: 4px; }
.rip-box.crashed { border-color: var(--red); box-shadow: 0 0 20px rgba(255, 107, 107, 0.4); }
.rip-box.crashed .rip-value { color: var(--red); }

.shake { animation: shake 0.5s ease; }
@keyframes shake {
  10%, 90% { transform: translateX(-2px); }
  20%, 80% { transform: translateX(4px); }
  30%, 50%, 70% { transform: translateX(-8px); }
  40%, 60% { transform: translateX(8px); }
}

/* ---------------------------------------------------- PIE lab */
.pie-body { display: flex; flex-direction: column; gap: 10px; }
.pie-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 4px 14px;
  padding: 12px 14px;
  border-radius: 10px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
}
.pie-label { font-size: 13px; color: var(--text-dim); }
.pie-val { font-family: var(--code-font); font-size: 16px; text-align: right; }
.pie-sub { grid-column: 1 / -1; font-size: 12px; color: #565e78; }
.pie-status { margin-top: 14px; font-size: 14px; color: var(--accent); min-height: 20px; }

/* ---------------------------------------------------- pointer lab */
.ptr-stage { position: relative; padding-top: 70px; min-height: 220px; }
.ptr-row { display: flex; gap: 24px; justify-content: center; }
.ptr-box {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px 22px;
  text-align: center;
  min-width: 140px;
  transition: box-shadow 0.3s;
}
.ptr-box.is-pointer { border-color: var(--accent-2); }
.ptr-decl { font-family: var(--code-font); color: var(--text-dim); font-size: 13px; }
.ptr-value { font-family: var(--code-font); font-size: 22px; margin: 8px 0; }
.ptr-addr { font-size: 11px; color: #565e78; }
.ptr-input {
  width: 80px;
  text-align: center;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-family: var(--code-font);
  font-size: 20px;
  padding: 4px;
}
.ptr-line {
  position: absolute;
  height: 3px;
  left: 0; top: 0;
  width: 0;
  background: linear-gradient(90deg, var(--accent-2), var(--accent));
  transform-origin: 0 50%;
  border-radius: 3px;
  transition: left 0.45s cubic-bezier(.4,0,.2,1), top 0.45s cubic-bezier(.4,0,.2,1), width 0.45s cubic-bezier(.4,0,.2,1), transform 0.45s cubic-bezier(.4,0,.2,1);
  box-shadow: 0 0 10px rgba(111, 215, 255, 0.6);
}
.ptr-line::after {
  content: "";
  position: absolute;
  right: -1px; top: 50%;
  width: 0; height: 0;
  border: 6px solid transparent;
  border-left-color: var(--accent);
  transform: translateY(-50%);
}

/* ---------------------------------------------------- responsive */
@media (max-width: 1150px) {
  .sim-view { grid-template-columns: 1fr; }
  .reg-grid { grid-template-columns: repeat(3, 1fr); }
}