@charset "UTF-8";
/* Session 1  -  prereq gate: 3D stacks, protocol steppers, calculators.
   Depends on the tokens defined in styles.css. */

/* ---------- shared 3D stage ---------- */
.stage3d {
  position: relative;
  height: 420px;
  perspective: 1500px;
  perspective-origin: 50% 42%;
  cursor: grab;
  touch-action: none;
  border-radius: var(--radius);
  background:
    radial-gradient(700px 380px at 50% 30%, rgba(91, 140, 255, 0.09), transparent 70%),
    linear-gradient(180deg, #0a1020, #0c1526);
  border: 1px solid var(--border);
  overflow: hidden;
}
.stage3d.grabbing {
  cursor: grabbing;
}
.stage3d .world {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  transform-style: preserve-3d;
  transition: transform 0.12s linear;
}
.stage3d .hint3d {
  position: absolute;
  right: 14px;
  bottom: 12px;
  z-index: 5;
  font-size: 11px;
  color: var(--muted);
  background: rgba(20, 27, 45, 0.72);
  padding: 5px 10px;
  border-radius: 8px;
  pointer-events: none;
}
.stage3d .reset3d {
  position: absolute;
  left: 14px;
  bottom: 12px;
  z-index: 5;
  font: 600 11px var(--sans);
  color: var(--muted);
  background: rgba(20, 27, 45, 0.85);
  border: 1px solid var(--border);
  padding: 5px 11px;
  border-radius: 8px;
  cursor: pointer;
}
.stage3d .reset3d:hover {
  color: var(--text);
}

/* a floating slab in the 3D world */
.slab {
  position: absolute;
  width: 460px;
  height: 168px;
  margin: -84px 0 0 -230px;
  transform-style: preserve-3d;
  border-radius: 16px;
  border: 1px solid var(--slab, var(--brand));
  background: linear-gradient(
    145deg,
    color-mix(in srgb, var(--slab, var(--brand)) 26%, #0d1426),
    #0d1426 78%
  );
  box-shadow:
    0 24px 60px rgba(0, 0, 0, 0.55),
    inset 0 0 40px rgba(255, 255, 255, 0.04);
  padding: 16px 20px;
  cursor: pointer;
  transition:
    box-shadow 0.2s ease,
    border-color 0.2s ease,
    filter 0.2s ease;
}
.slab:hover {
  filter: brightness(1.18);
}
.slab.on {
  border-color: #fff;
  box-shadow:
    0 0 0 2px var(--slab, var(--brand)),
    0 28px 70px rgba(0, 0, 0, 0.6);
}
.slab .idx {
  font: 800 11px var(--mono);
  color: var(--slab, var(--brand));
  letter-spacing: 0.16em;
}
.slab h4 {
  margin: 4px 0 6px;
  font-size: 22px;
  letter-spacing: -0.01em;
}
.slab p {
  margin: 0;
  font-size: 13px;
  line-height: 1.55;
  color: #b9c4e6;
  max-width: 400px;
}
.slab .ic3 {
  position: absolute;
  right: 18px;
  top: 14px;
  font-size: 30px;
  opacity: 0.9;
}
/* faint drop-line so depth is readable */
.slab::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 100%;
  width: 1px;
  height: 90px;
  background: linear-gradient(var(--slab, var(--brand)), transparent);
  opacity: 0.35;
}

.info3d {
  margin-top: 14px;
  border: 1px solid var(--border);
  border-left: 3px solid var(--brand);
  background: var(--panel-2);
  border-radius: 0 12px 12px 0;
  padding: 14px 18px;
  font-size: 13.5px;
  line-height: 1.7;
  color: #cdd6f4;
  min-height: 74px;
}
.info3d b {
  color: var(--text);
}

/* ---------- protocol stepper ---------- */
.stepper {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: linear-gradient(180deg, #0a1020, #0c1526);
  overflow: hidden;
}
.stepper .canvas {
  display: block;
  width: 100%;
}
.stepper .canvas svg {
  display: block;
  width: 100%;
  height: auto;
}
.stepctrl {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-top: 1px solid var(--border);
  background: var(--bg-2);
  flex-wrap: wrap;
}
.stepctrl button {
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text);
  height: 32px;
  min-width: 32px;
  padding: 0 11px;
  border-radius: 9px;
  cursor: pointer;
  font: 600 12px var(--sans);
}
.stepctrl button:hover:not(:disabled) {
  background: var(--panel);
  border-color: var(--brand);
}
.stepctrl button:disabled {
  opacity: 0.35;
  cursor: default;
}
.stepctrl .ticks {
  display: flex;
  gap: 6px;
  margin-left: 4px;
}
.stepctrl .ticks i {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--panel-2);
  border: 1px solid var(--border);
  cursor: pointer;
}
.stepctrl .ticks i.done {
  background: var(--brand);
  border-color: var(--brand);
}
.stepctrl .ticks i.now {
  width: 24px;
  border-radius: 99px;
  background: linear-gradient(90deg, var(--brand), var(--brand-2));
  border-color: transparent;
}
.stepctrl .counter {
  margin-left: auto;
  font: 600 12px var(--mono);
  color: var(--muted);
}
.narration {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border-top: 1px solid var(--border);
}
.narration .txt {
  padding: 16px 20px;
  min-width: 0;
}
.narration .txt .lbl {
  font: 800 11px var(--mono);
  letter-spacing: 0.14em;
  color: var(--brand);
  text-transform: uppercase;
}
.narration .txt h5 {
  margin: 6px 0 8px;
  font-size: 16px;
}
.narration .txt p {
  margin: 0 0 8px;
  font-size: 13.5px;
  line-height: 1.7;
  color: #cdd6f4;
}
.narration .txt .why {
  font-size: 12.5px;
  color: var(--muted);
  border-top: 1px dashed var(--border);
  padding-top: 8px;
  margin: 0;
}
.narration .wire {
  border-left: 1px solid var(--border);
  background: #080d18;
  padding: 16px 18px;
  min-width: 0;
  overflow-x: auto;
}
.narration .wire pre {
  margin: 0;
  font: 500 12px/1.65 var(--mono);
  color: #a6e3a1;
  white-space: pre;
}
.narration .wire .cap {
  font: 800 10px var(--mono);
  letter-spacing: 0.14em;
  color: var(--muted);
  text-transform: uppercase;
  margin-bottom: 8px;
}
@media (max-width: 900px) {
  .narration {
    grid-template-columns: 1fr;
  }
  .narration .wire {
    border-left: 0;
    border-top: 1px solid var(--border);
  }
}

/* stepper svg pieces */
.sv-node rect {
  fill: #16203a;
}
.sv-title {
  font: 700 13px var(--sans);
  fill: #e9eeff;
}
.sv-sub {
  font: 500 10.5px var(--mono);
  fill: #8f9bc0;
}
.sv-msg {
  font: 600 11.5px var(--mono);
  fill: #cdd6f4;
}
.sv-note {
  font: 700 11px var(--sans);
  fill: #fbbf24;
}
.sv-dim {
  opacity: 0.16;
  transition: opacity 0.3s ease;
}
.sv-live {
  opacity: 1;
  transition: opacity 0.3s ease;
}

/* ---------- calculators ---------- */
.calc {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 20px;
  align-items: start;
}
@media (max-width: 900px) {
  .calc {
    grid-template-columns: 1fr;
  }
}
.ctl {
  border: 1px solid var(--border);
  background: var(--panel-2);
  border-radius: 12px;
  padding: 16px;
}
.ctl label {
  display: block;
  font: 700 11px var(--sans);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
  margin: 0 0 6px;
}
.ctl label + label {
  margin-top: 16px;
}
.ctl input[type="text"] {
  width: 100%;
  background: #080d18;
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 9px;
  padding: 9px 11px;
  font: 600 13px var(--mono);
}
.ctl input[type="range"] {
  width: 100%;
  accent-color: var(--brand);
}
.ctl .val {
  font: 800 15px var(--mono);
  color: var(--brand);
}
.ctl .err {
  color: var(--danger);
  font-size: 11.5px;
  margin-top: 6px;
  min-height: 14px;
}
.presets {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-top: 8px;
}
.presets button {
  background: var(--panel);
  border: 1px solid var(--border);
  color: var(--muted);
  border-radius: 8px;
  padding: 5px 9px;
  font: 600 11px var(--mono);
  cursor: pointer;
}
.presets button:hover {
  color: var(--text);
  border-color: var(--brand);
}

.readout {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 10px;
  margin-bottom: 14px;
}
.readout div {
  border: 1px solid var(--border);
  background: var(--panel-2);
  border-radius: 10px;
  padding: 11px 13px;
}
.readout small {
  display: block;
  font: 700 10px var(--sans);
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--muted);
}
.readout b {
  font: 800 15px var(--mono);
  color: var(--text);
}

/* tilted /24 grid for the CIDR visualiser */
.gridwrap {
  perspective: 1100px;
  padding: 10px 0 4px;
}
.grid24 {
  display: grid;
  grid-template-columns: repeat(16, 1fr);
  gap: 3px;
  transform: rotateX(46deg) rotateZ(-4deg);
  transform-origin: 50% 100%;
  transition: transform 0.3s ease;
}
.gridwrap:hover .grid24 {
  transform: rotateX(20deg) rotateZ(-2deg);
}
.grid24 i {
  aspect-ratio: 1;
  border-radius: 3px;
  background: var(--panel-2);
  box-shadow: 0 3px 0 rgba(0, 0, 0, 0.5);
}
.subnet-table {
  width: 100%;
  border-collapse: collapse;
  font: 500 12px var(--mono);
  margin-top: 16px;
}
.subnet-table th,
.subnet-table td {
  border: 1px solid var(--border);
  padding: 7px 10px;
  text-align: left;
}
.subnet-table th {
  background: var(--panel-2);
  font: 700 10.5px var(--sans);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}
.subnet-table td .swatch {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 3px;
  margin-right: 8px;
  vertical-align: -1px;
}

/* chmod bit grid */
.bits {
  display: grid;
  grid-template-columns: 88px repeat(3, 1fr);
  gap: 8px;
  align-items: center;
}
.bits .hd {
  font: 700 10px var(--sans);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
  text-align: center;
}
.bits .rowlbl {
  font: 700 12px var(--sans);
  color: var(--text);
}
.bits button {
  height: 46px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--muted);
  font: 800 15px var(--mono);
  cursor: pointer;
  transition: all 0.14s ease;
}
.bits button.on {
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  border-color: transparent;
  color: #fff;
  box-shadow: 0 6px 18px rgba(91, 140, 255, 0.35);
}
.modeout {
  display: flex;
  gap: 12px;
  align-items: baseline;
  flex-wrap: wrap;
  margin-top: 16px;
}
.modeout .octal {
  font: 800 34px var(--mono);
  letter-spacing: 0.06em;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.modeout .sym {
  font: 700 18px var(--mono);
  color: var(--ok);
}
.modeout .cmd {
  font: 500 12px var(--mono);
  color: var(--muted);
}
.verdict {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.6;
  color: #cdd6f4;
  border-left: 3px solid var(--warn);
  background: var(--panel-2);
  border-radius: 0 10px 10px 0;
  padding: 10px 14px;
}

/* ---------- git graph ---------- */
.gitwrap {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: linear-gradient(180deg, #0a1020, #0c1526);
  overflow: hidden;
}
.gitwrap svg {
  display: block;
  width: 100%;
  height: auto;
}
.gitwrap .cm {
  transition: transform 0.45s cubic-bezier(0.4, 0, 0.2, 1);
}
.git-actions {
  display: flex;
  gap: 8px;
  padding: 10px 14px;
  border-top: 1px solid var(--border);
  background: var(--bg-2);
  flex-wrap: wrap;
}
.git-actions button {
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 7px 13px;
  border-radius: 9px;
  cursor: pointer;
  font: 600 12px var(--sans);
}
.git-actions button:hover:not(:disabled) {
  border-color: var(--brand);
}
.git-actions button:disabled {
  opacity: 0.35;
  cursor: default;
}
.git-actions .sp {
  margin-left: auto;
}
.gitlog {
  border-top: 1px solid var(--border);
  background: #080d18;
  padding: 14px 18px;
  font: 500 12px/1.7 var(--mono);
  color: #a6e3a1;
  min-height: 70px;
  white-space: pre-wrap;
}

/* ---------- self-check gate ---------- */
.gate {
  display: grid;
  grid-template-columns: 1fr 220px;
  gap: 22px;
  align-items: start;
}
@media (max-width: 900px) {
  .gate {
    grid-template-columns: 1fr;
  }
}
.gate ul {
  list-style: none;
  margin: 0;
  padding: 0;
}
.gate li {
  margin: 0 0 7px;
}
.gate li button {
  width: 100%;
  text-align: left;
  display: flex;
  gap: 11px;
  align-items: flex-start;
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: #cdd6f4;
  border-radius: 10px;
  padding: 11px 13px;
  cursor: pointer;
  font: 500 13.5px/1.5 var(--sans);
}
.gate li button:hover {
  border-color: var(--brand);
}
.gate li button .box {
  flex: 0 0 18px;
  width: 18px;
  height: 18px;
  border-radius: 5px;
  border: 1.5px solid var(--border);
  display: grid;
  place-items: center;
  font-size: 11px;
  color: transparent;
  margin-top: 1px;
}
.gate li button.on {
  color: var(--text);
  border-color: var(--ok);
}
.gate li button.on .box {
  background: var(--ok);
  border-color: var(--ok);
  color: #06281c;
}
.ring {
  border: 1px solid var(--border);
  background: var(--panel-2);
  border-radius: 12px;
  padding: 18px;
  text-align: center;
  position: sticky;
  top: 74px;
}
.ring svg {
  width: 128px;
  height: 128px;
  display: block;
  margin: 0 auto 8px;
}
.ring .pct {
  font: 800 22px var(--mono);
  fill: var(--text);
}
.ring h5 {
  margin: 2px 0 4px;
  font-size: 14px;
}
.ring p {
  margin: 0;
  font-size: 11.5px;
  line-height: 1.55;
  color: var(--muted);
}
.ring button {
  margin-top: 12px;
  width: 100%;
  background: var(--panel);
  border: 1px solid var(--border);
  color: var(--muted);
  border-radius: 9px;
  padding: 7px;
  font: 600 11px var(--sans);
  cursor: pointer;
}
.ring button:hover {
  color: var(--text);
}

/* draft banner for sessions pending sanitisation */
.draftbar {
  border: 1px solid #6b4d12;
  border-left: 3px solid var(--warn);
  background: rgba(251, 191, 36, 0.08);
  border-radius: 0 10px 10px 0;
  padding: 11px 16px;
  margin: 0 0 18px;
  font-size: 13px;
  color: #f3dfae;
}
.draftbar b {
  color: var(--warn);
}

@media (prefers-reduced-motion: reduce) {
  .stage3d .world,
  .grid24,
  .gitwrap .cm {
    transition: none !important;
  }
}