/**
 * Калькулятор IP-сетей и масок (/kalkulyator-ip-setej-i-masok/)
 * Цвета зон: сеть — изумрудный, узел — фиолетовый, «может быть» — янтарный.
 */

.page--ip-calc {
  --ipc-net: #10b981;
  --ipc-net-soft: rgba(16, 185, 129, 0.16);
  --ipc-host: #8b5cf6;
  --ipc-host-soft: rgba(139, 92, 246, 0.16);
  --ipc-maybe: #f59e0b;
  --ipc-maybe-soft: rgba(245, 158, 11, 0.18);
  --ipc-diff: #f43f5e;
  --ipc-accent: #22d3ee;
  --ipc-panel-bg: linear-gradient(165deg, rgba(30, 41, 59, 0.74) 0%, rgba(15, 23, 42, 0.9) 100%);
  --ipc-panel-border: rgba(255, 255, 255, 0.1);
  --ipc-cell-bg: rgba(255, 255, 255, 0.04);
  --ipc-input-bg: rgba(15, 23, 42, 0.6);
  --ipc-text: var(--white);
  --ipc-mono: ui-monospace, "SFMono-Regular", "JetBrains Mono", Menlo, Consolas, monospace;
  padding-bottom: 0 !important;
}

[data-theme="light"] .page--ip-calc {
  --ipc-net: #059669;
  --ipc-net-soft: rgba(5, 150, 105, 0.12);
  --ipc-host: #7c3aed;
  --ipc-host-soft: rgba(124, 58, 237, 0.1);
  --ipc-maybe: #d97706;
  --ipc-maybe-soft: rgba(217, 119, 6, 0.14);
  --ipc-accent: #0891b2;
  --ipc-panel-bg: linear-gradient(165deg, #ffffff 0%, #f1f5f9 100%);
  --ipc-panel-border: rgba(15, 23, 42, 0.08);
  --ipc-cell-bg: rgba(15, 23, 42, 0.04);
  --ipc-input-bg: #ffffff;
}

.ipc-main {
  width: 100%;
  box-sizing: border-box;
  margin: 0 auto;
  padding: 0.5rem clamp(0.75rem, 2.5vw, 2.75rem) 1rem;
  color: var(--ipc-text);
}

/* ── Верхняя полоса: название, вкладки, примеры ── */

.ipc-topbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem 1rem;
}

.ipc-brand {
  display: grid;
  gap: 0.15rem;
}

.ipc-brand__badge {
  justify-self: start;
  padding: 0.1rem 0.5rem;
  border-radius: 999px;
  border: 1px solid rgba(34, 211, 238, 0.4);
  background: rgba(34, 211, 238, 0.1);
  color: var(--ipc-accent);
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.ipc-brand__title {
  margin: 0;
  font-size: clamp(1.05rem, 1.6vw, 1.35rem);
  line-height: 1.15;
  white-space: nowrap;
  background: linear-gradient(90deg, var(--ipc-net) 0%, var(--ipc-accent) 50%, var(--ipc-host) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.ipc-examples {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
  margin-left: auto;
}

.ipc-examples__label {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.ipc-examples__link {
  display: inline-grid;
  place-items: center;
  width: 1.7rem;
  height: 1.7rem;
  border-radius: 50%;
  border: 1px solid var(--ipc-panel-border);
  color: var(--ipc-accent);
  font-size: 0.8rem;
  text-decoration: none;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.ipc-examples__link:hover {
  border-color: rgba(34, 211, 238, 0.5);
  background: rgba(34, 211, 238, 0.12);
}

/* ── Чипы и кнопки ── */

.ipc-chip {
  appearance: none;
  border: 1px solid var(--ipc-panel-border);
  background: var(--ipc-cell-bg);
  color: var(--text-muted);
  border-radius: 999px;
  padding: 0.35rem 0.8rem;
  font: inherit;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease, color 0.15s ease;
}

.ipc-chip:hover,
.ipc-chip.is-active {
  border-color: rgba(34, 211, 238, 0.5);
  background: rgba(34, 211, 238, 0.12);
  color: var(--ipc-text);
}

.ipc-btn {
  appearance: none;
  border: 1px solid transparent;
  border-radius: 0.65rem;
  padding: 0.6rem 1.1rem;
  font: inherit;
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.12s ease, background 0.15s ease, border-color 0.15s ease;
}

.ipc-btn:active {
  transform: translateY(1px);
}

.ipc-btn--primary {
  background: linear-gradient(135deg, var(--ipc-net) 0%, #0891b2 100%);
  color: #fff;
}

.ipc-btn--primary:hover {
  filter: brightness(1.08);
}

.ipc-btn--ghost {
  background: transparent;
  border-color: var(--ipc-panel-border);
  color: var(--ipc-text);
}

.ipc-btn--ghost:hover {
  border-color: rgba(34, 211, 238, 0.5);
}

/* ── Вкладки ── */

.ipc-tabs {
  flex: 1 1 30rem;
  max-width: 44rem;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.3rem;
  padding: 0.25rem;
  border-radius: 0.9rem;
  border: 1px solid var(--ipc-panel-border);
  background: var(--ipc-panel-bg);
}

.ipc-tabs__tab {
  appearance: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  border: 1px solid transparent;
  border-radius: 0.7rem;
  padding: 0.4rem 0.5rem;
  background: transparent;
  color: var(--text-muted);
  font: inherit;
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

.ipc-tabs__tab:hover {
  color: var(--ipc-text);
}

.ipc-tabs__tab.is-active {
  color: var(--ipc-text);
  border-color: rgba(34, 211, 238, 0.35);
  background: linear-gradient(135deg, var(--ipc-net-soft) 0%, var(--ipc-host-soft) 100%);
}

.ipc-tabs__icon {
  display: inline-grid;
  place-items: center;
  width: 1.4rem;
  height: 1.4rem;
  border-radius: 0.45rem;
  background: var(--ipc-cell-bg);
  font-family: var(--ipc-mono);
  font-size: 0.9rem;
}

.ipc-tabs__tab.is-active .ipc-tabs__icon {
  background: var(--ipc-accent);
  color: #0f172a;
}

/* ── Панель режима ── */

/* Режим = две вертикальные колонки: слева работа с битами, справа результаты */
.ipc-panel {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
  gap: 0.75rem;
  margin-top: 0.6rem;
  animation: ipc-fade-in 0.25s ease-out;
}

.ipc-panel[hidden] {
  display: none;
}

.ipc-col {
  min-width: 0;
  padding: 0.9rem clamp(0.8rem, 1.6vw, 1.2rem) 1rem;
  border-radius: 1.1rem;
  border: 1px solid var(--ipc-panel-border);
  background: var(--ipc-panel-bg);
  box-shadow:
    0 12px 40px rgba(0, 0, 0, 0.26),
    inset 0 1px 0 rgba(255, 255, 255, 0.06);
  scrollbar-width: thin;
  scrollbar-color: rgba(34, 211, 238, 0.35) transparent;
}

[data-theme="light"] .ipc-col {
  box-shadow: 0 10px 28px rgba(15, 23, 42, 0.08);
}

.ipc-col__title {
  margin: 0 0 0.6rem;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.ipc-col--side > .ipc-explain:first-child {
  margin-top: 0;
}

@keyframes ipc-fade-in {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ── Форма ── */

.ipc-form {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.75rem 1rem;
}

.ipc-form--wide {
  grid-template-columns: repeat(auto-fit, minmax(10rem, 1fr));
}

.ipc-field {
  display: grid;
  gap: 0.3rem;
}

.ipc-field__label {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
}

.ipc-field__label strong {
  color: var(--ipc-accent);
  font-family: var(--ipc-mono);
}

.ipc-field__input {
  width: 100%;
  box-sizing: border-box;
  padding: 0.6rem 0.75rem;
  border-radius: 0.6rem;
  border: 1px solid var(--ipc-panel-border);
  background: var(--ipc-input-bg);
  color: var(--ipc-text);
  font-family: var(--ipc-mono);
  font-size: 1rem;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.ipc-field__input:focus {
  outline: none;
  border-color: var(--ipc-accent);
  box-shadow: 0 0 0 3px rgba(34, 211, 238, 0.18);
}

.ipc-field__input.is-invalid {
  border-color: var(--ipc-diff);
  box-shadow: 0 0 0 3px rgba(244, 63, 94, 0.16);
}

select.ipc-field__input {
  font-family: inherit;
  font-size: 0.9rem;
}

.ipc-field--range {
  align-content: end;
}

.ipc-range {
  --ipc-fill: 68%;
  width: 100%;
  height: 0.55rem;
  margin: 0.55rem 0;
  border-radius: 999px;
  appearance: none;
  background: linear-gradient(
    90deg,
    var(--ipc-net) 0%,
    var(--ipc-net) var(--ipc-fill),
    var(--ipc-host) var(--ipc-fill),
    var(--ipc-host) 100%
  );
  cursor: pointer;
}

.ipc-range::-webkit-slider-thumb {
  appearance: none;
  width: 1.3rem;
  height: 1.3rem;
  border-radius: 50%;
  border: 3px solid #fff;
  background: var(--ipc-accent);
  box-shadow: 0 0 0 4px rgba(34, 211, 238, 0.25);
}

.ipc-range::-moz-range-thumb {
  width: 1.1rem;
  height: 1.1rem;
  border-radius: 50%;
  border: 3px solid #fff;
  background: var(--ipc-accent);
}

.ipc-check {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.75rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  cursor: pointer;
}

.ipc-status {
  min-height: 1.2rem;
  margin: 0.5rem 0 0;
  font-size: 0.82rem;
  color: var(--ipc-diff);
}

/* ── Побитовая доска ── */

.ipc-board {
  margin-top: 0.4rem;
  padding: 0.85rem;
  border-radius: 0.9rem;
  background: rgba(2, 6, 23, 0.35);
  border: 1px solid var(--ipc-panel-border);
  overflow-x: auto;
}

[data-theme="light"] .ipc-board {
  background: rgba(241, 245, 249, 0.8);
}

.ipc-board__hint {
  margin: 0 0 0.6rem;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.ipc-board__row {
  display: grid;
  grid-template-columns: 7.5rem repeat(4, minmax(7.5rem, 1fr));
  gap: 0.55rem;
  align-items: center;
  min-width: 40rem;
}

.ipc-board__row + .ipc-board__row {
  margin-top: 0.4rem;
}

.ipc-board__label {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-muted);
}

.ipc-board__op {
  display: inline-grid;
  place-items: center;
  width: 1.3rem;
  height: 1.3rem;
  border-radius: 0.35rem;
  background: var(--ipc-cell-bg);
  color: var(--ipc-accent);
  font-family: var(--ipc-mono);
}

.ipc-board__row--net .ipc-board__label,
.ipc-board__row--mask .ipc-board__label {
  color: var(--ipc-text);
}

.ipc-octet {
  position: relative;
  display: grid;
  gap: 0.2rem;
  padding: 0.25rem;
  border-radius: 0.55rem;
  transition: background 0.2s ease;
}

.ipc-octet:not(:last-child)::after {
  content: ".";
  position: absolute;
  right: -0.45rem;
  bottom: 0.1rem;
  color: var(--text-muted);
  font-weight: 800;
}

.ipc-octet.is-key {
  background: rgba(34, 211, 238, 0.08);
  box-shadow: inset 0 0 0 1px rgba(34, 211, 238, 0.28);
}

.ipc-octet--weights {
  padding-top: 0;
  padding-bottom: 0;
}

.ipc-octet--weights::after {
  content: none !important;
}

.ipc-octet__bits {
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  gap: 2px;
}

.ipc-octet__dec {
  text-align: center;
  font-family: var(--ipc-mono);
  font-size: 0.85rem;
  font-weight: 700;
}

.ipc-weight {
  text-align: center;
  font-family: var(--ipc-mono);
  font-size: 0.56rem;
  color: var(--text-muted);
  opacity: 0.75;
}

.ipc-bit {
  appearance: none;
  display: grid;
  place-items: center;
  aspect-ratio: 1 / 1.25;
  min-width: 0;
  padding: 0;
  border: 1px solid transparent;
  border-radius: 0.3rem;
  background: var(--ipc-cell-bg);
  color: var(--ipc-text);
  font-family: var(--ipc-mono);
  font-size: 0.85rem;
  font-weight: 700;
  line-height: 1;
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.12s ease;
}

button.ipc-bit {
  cursor: pointer;
}

button.ipc-bit:hover {
  transform: translateY(-2px);
  border-color: var(--ipc-accent);
}

.ipc-bit.is-zero {
  opacity: 0.72;
}

.ipc-bit.is-net {
  background: var(--ipc-net-soft);
}

.ipc-bit.is-net.is-one {
  background: var(--ipc-net);
  color: #fff;
  opacity: 1;
}

.ipc-bit.is-host {
  background: var(--ipc-host-soft);
}

.ipc-bit.is-host.is-one {
  background: rgba(139, 92, 246, 0.55);
  color: #fff;
}

/* В результате конъюнкции биты узла гаснут */
.ipc-bit.is-result.is-host {
  background: transparent;
  border-color: var(--ipc-host-soft);
  opacity: 0.5;
}

/* Строка «Места под узлы»: биты сети зафиксированы, биты узла — пустые слоты */
.ipc-bit.is-locked {
  background: transparent;
  border-color: var(--ipc-net-soft);
  color: var(--ipc-net);
  opacity: 0.4;
}

.ipc-bit.is-slot {
  border: 1px dashed var(--ipc-host);
  background: var(--ipc-host-soft);
  animation: ipc-slot-glow 2.4s ease-in-out infinite;
}

/* анимация слота перекрывает box-shadow границы, поэтому граница — рамкой */
.ipc-bit.is-slot.is-edge {
  border-left: 3px solid var(--ipc-accent);
}

.ipc-board__row--hosts {
  padding-top: 0.4rem;
  border-top: 1px dashed var(--ipc-panel-border);
}

.ipc-board__row--hosts .ipc-board__label {
  flex-wrap: wrap;
  color: var(--ipc-host);
}

.ipc-board__row--hosts .ipc-octet__dec {
  color: var(--ipc-host);
}

.ipc-board__name {
  white-space: nowrap;
}

.ipc-board__sub {
  flex-basis: 100%;
  padding-left: 1.65rem;
  white-space: nowrap;
  font-family: var(--ipc-mono);
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--text-muted);
}

@keyframes ipc-slot-glow {
  0%,
  100% {
    box-shadow: inset 0 0 0 0 rgba(139, 92, 246, 0);
  }
  50% {
    box-shadow: inset 0 0 8px 0 rgba(139, 92, 246, 0.45);
  }
}

.ipc-bit.is-edge {
  box-shadow: -3px 0 0 0 var(--ipc-accent), -8px 0 14px -4px rgba(34, 211, 238, 0.7);
}

.ipc-bit.is-maybe {
  background: repeating-linear-gradient(
    135deg,
    var(--ipc-maybe-soft) 0,
    var(--ipc-maybe-soft) 4px,
    transparent 4px,
    transparent 8px
  );
  border-color: var(--ipc-maybe);
  color: var(--ipc-maybe);
}

.ipc-bit.is-diff {
  border-color: var(--ipc-diff);
  color: var(--ipc-diff);
  opacity: 1;
}

.ipc-bit.is-first-diff {
  background: rgba(244, 63, 94, 0.2);
  animation: ipc-pulse 1.6s ease-in-out infinite;
}

.ipc-bit.is-last-one {
  border-color: var(--ipc-net);
  box-shadow: 0 0 0 2px var(--ipc-net-soft);
}

.ipc-bit.is-bad {
  color: var(--ipc-diff);
  background: rgba(244, 63, 94, 0.1);
}

.ipc-bit.is-flip {
  animation: ipc-flip 0.4s ease-out;
}

@keyframes ipc-flip {
  0% {
    transform: rotateX(90deg);
  }
  100% {
    transform: rotateX(0);
  }
}

@keyframes ipc-pulse {
  0%,
  100% {
    box-shadow: 0 0 0 0 rgba(244, 63, 94, 0.45);
  }
  50% {
    box-shadow: 0 0 0 5px rgba(244, 63, 94, 0);
  }
}

/* ── Легенда ── */

.ipc-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1rem;
  margin: 0.6rem 0 0;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.ipc-legend__item {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.ipc-legend__item::before {
  content: "";
  width: 0.8rem;
  height: 0.8rem;
  border-radius: 0.2rem;
}

.ipc-legend__item--net::before {
  background: var(--ipc-net);
}

.ipc-legend__item--host::before {
  background: var(--ipc-host);
}

.ipc-legend__item--edge::before {
  width: 3px;
  background: var(--ipc-accent);
  box-shadow: 0 0 6px var(--ipc-accent);
}

.ipc-legend__item--maybe::before {
  border: 1px solid var(--ipc-maybe);
  background: var(--ipc-maybe-soft);
}

.ipc-legend__item--diff::before {
  border: 1px solid var(--ipc-diff);
}

/* ── Карточки результатов ── */

.ipc-results,
.ipc-summary {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(12rem, 1fr));
  gap: 0.6rem;
  margin-top: 1rem;
}

.ipc-result {
  appearance: none;
  display: grid;
  gap: 0.2rem;
  align-content: start;
  padding: 0.7rem 0.85rem;
  border-radius: 0.8rem;
  border: 1px solid var(--ipc-panel-border);
  background: var(--ipc-cell-bg);
  color: var(--ipc-text);
  font: inherit;
  text-align: left;
  cursor: copy;
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.ipc-result:hover {
  border-color: rgba(34, 211, 238, 0.45);
  transform: translateY(-1px);
}

.ipc-result__label {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-muted);
}

.ipc-result__value {
  font-family: var(--ipc-mono);
  font-size: 1.1rem;
  font-weight: 800;
  word-break: break-all;
}

.ipc-result__sub {
  font-size: 0.72rem;
  color: var(--text-muted);
}

.ipc-result--main {
  border-color: rgba(16, 185, 129, 0.4);
  background: var(--ipc-net-soft);
}

.ipc-result--answer {
  border-color: rgba(34, 211, 238, 0.45);
  background: linear-gradient(135deg, rgba(34, 211, 238, 0.14) 0%, var(--ipc-host-soft) 100%);
}

.ipc-result--answer .ipc-result__value {
  color: var(--ipc-accent);
  font-size: 1.35rem;
}

/* ── Пояснения ── */

.ipc-explain {
  margin-top: 1rem;
  padding: 0.9rem 1rem;
  border-radius: 0.9rem;
  border-left: 3px solid var(--ipc-accent);
  background: rgba(34, 211, 238, 0.06);
}

.ipc-explain:empty {
  display: none;
}

.ipc-explain__title {
  margin: 0 0 0.5rem;
  font-size: 1rem;
}

.ipc-explain__steps {
  margin: 0;
  padding-left: 1.25rem;
  display: grid;
  gap: 0.5rem;
  font-size: 0.9rem;
  line-height: 1.5;
}

.ipc-explain__text {
  margin: 0.5rem 0 0;
  font-size: 0.88rem;
  line-height: 1.5;
}

.ipc-explain code {
  font-family: var(--ipc-mono);
  font-size: 0.85em;
}

.ipc-code {
  margin: 0.4rem 0 0;
  padding: 0.7rem 0.85rem;
  border-radius: 0.6rem;
  background: rgba(2, 6, 23, 0.55);
  color: #e2e8f0;
  font-family: var(--ipc-mono);
  font-size: 0.8rem;
  overflow-x: auto;
}

.ipc-answer {
  color: var(--ipc-accent);
}

.ipc-tag {
  padding: 0 0.35rem;
  border-radius: 0.3rem;
  font-weight: 700;
}

.ipc-tag--net {
  background: var(--ipc-net-soft);
  color: var(--ipc-net);
}

.ipc-tag--host {
  background: var(--ipc-host-soft);
  color: var(--ipc-host);
}

.ipc-calc {
  display: grid;
  grid-template-columns: auto auto auto;
  justify-content: start;
  gap: 0.15rem 0.5rem;
  margin: 0.4rem 0 0.1rem;
  font-family: var(--ipc-mono);
}

.ipc-calc > span:nth-child(3n + 1) {
  text-align: right;
}

.ipc-calc__res {
  color: var(--ipc-accent);
  font-weight: 800;
}

.ipc-calc .ipc-calc__res ~ .ipc-bin {
  border-top: 1px solid var(--ipc-panel-border);
}

.ipc-bin {
  letter-spacing: 0.12em;
}

.ipc-bin__net {
  color: var(--ipc-net);
  font-weight: 800;
}

.ipc-bin__host {
  color: var(--ipc-host);
}

/* ── Таблица масок ── */

.ipc-table-wrap {
  margin-top: 0.8rem;
  overflow-x: auto;
}

.ipc-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

.ipc-table th,
.ipc-table td {
  padding: 0.45rem 0.6rem;
  border-bottom: 1px solid var(--ipc-panel-border);
  text-align: left;
  white-space: nowrap;
}

.ipc-table th {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.ipc-table td {
  font-family: var(--ipc-mono);
}

.ipc-table tbody tr {
  cursor: pointer;
  transition: background 0.15s ease;
}

.ipc-table tbody tr:hover,
.ipc-table tbody tr:focus-visible {
  background: rgba(34, 211, 238, 0.08);
  outline: none;
}

.ipc-table tr.is-max td:first-child::after {
  content: " ▲ max";
  color: var(--ipc-accent);
  font-size: 0.7rem;
}

.ipc-table tr.is-min td:first-child::after {
  content: " ▼ min";
  color: var(--ipc-maybe);
  font-size: 0.7rem;
}

.ipc-table tr.is-max.is-min td:first-child::after {
  content: " ◆";
}

.ipc-table__bits {
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

/* ── Счётчик ── */

.ipc-count {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.4rem 1rem;
  margin-top: 0.8rem;
}

.ipc-count__big {
  font-family: var(--ipc-mono);
  font-size: clamp(2rem, 6vw, 3rem);
  font-weight: 800;
  line-height: 1;
  color: var(--ipc-accent);
  cursor: copy;
}

.ipc-count__text {
  flex: 1 1 18rem;
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.ipc-histogram {
  display: flex;
  align-items: flex-end;
  gap: 3px;
  height: 11rem;
  margin-top: 1rem;
  padding: 0.6rem 0.6rem 0;
  border-radius: 0.8rem;
  background: rgba(2, 6, 23, 0.3);
  overflow-x: auto;
}

[data-theme="light"] .ipc-histogram {
  background: rgba(241, 245, 249, 0.8);
}

.ipc-hist__col {
  flex: 1 0 1.6rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  height: 100%;
}

.ipc-hist__count {
  font-family: var(--ipc-mono);
  font-size: 0.55rem;
  color: var(--text-muted);
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  margin-bottom: 0.2rem;
  max-height: 3.5rem;
  overflow: hidden;
}

.ipc-hist__bar {
  width: 100%;
  height: calc(var(--h) * 0.62);
  border-radius: 0.3rem 0.3rem 0 0;
  background: var(--ipc-host-soft);
  border: 1px solid rgba(139, 92, 246, 0.35);
  border-bottom: 0;
  transform-origin: bottom;
  animation: ipc-grow 0.35s ease-out;
}

.ipc-hist__col.is-hit .ipc-hist__bar {
  background: linear-gradient(180deg, var(--ipc-accent) 0%, var(--ipc-net) 100%);
  border-color: transparent;
}

.ipc-hist__label {
  padding: 0.2rem 0;
  font-family: var(--ipc-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
}

.ipc-hist__col.is-hit .ipc-hist__label {
  color: var(--ipc-text);
  font-weight: 800;
}

@keyframes ipc-grow {
  from {
    transform: scaleY(0);
  }
  to {
    transform: scaleY(1);
  }
}

/* ── Практика ── */

.ipc-practice__top {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.ipc-practice__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.ipc-practice__stats strong {
  color: var(--ipc-text);
  font-variant-numeric: tabular-nums;
}

.ipc-practice__kinds {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.ipc-task {
  padding: 1rem 1.1rem;
  border-radius: 0.9rem;
  border: 1px solid var(--ipc-panel-border);
  background: var(--ipc-cell-bg);
}

.ipc-task__kicker {
  margin: 0 0 0.4rem;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--ipc-accent);
}

.ipc-task__text {
  margin: 0;
  font-size: 1rem;
  line-height: 1.6;
}

.ipc-task__answer {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.9rem;
}

.ipc-task__input {
  max-width: 14rem;
}

.ipc-task__feedback {
  min-height: 1.3rem;
  margin: 0.6rem 0 0;
  font-weight: 700;
  font-size: 0.9rem;
}

.ipc-task__feedback.is-ok {
  color: var(--ipc-net);
}

.ipc-task__feedback.is-bad {
  color: var(--ipc-diff);
}

.ipc-task__feedback.is-reveal {
  color: var(--ipc-maybe);
}

.ipc-task__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.6rem;
}

/* ── Тост ── */

.ipc-toast {
  position: fixed;
  left: 50%;
  bottom: 1.5rem;
  z-index: 80;
  padding: 0.55rem 1rem;
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.92);
  color: #fff;
  font-size: 0.85rem;
  transform: translate(-50%, 1rem);
  opacity: 0;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.ipc-toast.is-visible {
  opacity: 1;
  transform: translate(-50%, 0);
}

/* ── Шпаргалка (практика) ── */

.ipc-cheat td {
  text-align: center;
}

.ipc-cheat td:nth-child(3) {
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.ipc-cheat tbody tr {
  cursor: default;
}

.ipc-cheat__tips {
  margin: 0.8rem 0 0;
  padding-left: 1.1rem;
  display: grid;
  gap: 0.35rem;
  font-size: 0.85rem;
  line-height: 1.45;
  color: var(--text-muted);
}

.ipc-col--side .ipc-results,
.ipc-col--side .ipc-summary {
  grid-template-columns: repeat(auto-fill, minmax(10rem, 1fr));
  gap: 0.5rem;
  margin-top: 0;
}

.ipc-col--side .ipc-result {
  padding: 0.55rem 0.7rem;
}

.ipc-col--side .ipc-summary + .ipc-table-wrap {
  margin-top: 0.8rem;
}

/* ── Полноэкранный режим: страница ровно по высоте окна, прокрутка только внутри колонок ── */

@media (min-width: 1024px) {
  .ipc-body {
    height: 100dvh;
    overflow: hidden;
  }

  .page.page--ip-calc {
    height: 100dvh;
    min-height: 0;
    overflow: hidden;
  }

  .page--ip-calc .footer {
    display: none;
  }

  .ipc-main {
    flex: 1 1 auto;
    min-height: 0;
    display: flex;
    flex-direction: column;
    padding-bottom: 0.75rem;
  }

  .ipc-topbar {
    flex: none;
  }

  .ipc-panel {
    flex: 1 1 auto;
    min-height: 0;
  }

  .ipc-col {
    min-height: 0;
    overflow-y: auto;
  }

  .ipc-status:empty {
    min-height: 0;
    margin: 0.25rem 0 0;
  }

  .ipc-explain__steps {
    font-size: 0.86rem;
    gap: 0.4rem;
  }

  .ipc-col--work .ipc-histogram {
    height: clamp(9rem, 32vh, 20rem);
  }
}

/* ── Адаптив ── */

@media (max-width: 1023px) {
  .ipc-panel {
    grid-template-columns: 1fr;
  }

  .ipc-examples {
    margin-left: 0;
  }
}

@media (max-width: 860px) {
  .ipc-form {
    grid-template-columns: 1fr 1fr;
  }

  .ipc-field--range {
    grid-column: 1 / -1;
  }
}

@media (max-width: 640px) {
  .ipc-tabs {
    grid-template-columns: 1fr 1fr;
  }

  .ipc-form {
    grid-template-columns: 1fr;
  }

  .ipc-task__answer {
    flex-direction: column;
  }

  .ipc-task__input {
    max-width: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .ipc-panel,
  .ipc-bit.is-flip,
  .ipc-bit.is-first-diff,
  .ipc-bit.is-slot,
  .ipc-hist__bar {
    animation: none;
  }
}