.calculator-hero {
  padding-bottom: var(--space-6);
}

.calculator-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(280px, 0.85fr);
  gap: var(--space-5);
  align-items: start;
}

.calculator-hero__content {
  margin-bottom: 0;
}

.calculator-hero__aside {
  height: 100%;
}

.calculator-tool-section {
  scroll-margin-top: 5.5rem;
}

.calculator-tool-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(270px, 0.6fr);
  gap: var(--space-5);
  align-items: start;
}

.calculator-shell {
  overflow: hidden;
  border: 1px solid rgba(0, 87, 168, 0.18);
  border-radius: var(--radius-lg);
  background: linear-gradient(145deg, #f9fcff 0%, #eef6fb 100%);
  box-shadow: 0 24px 60px rgba(15, 53, 87, 0.13);
}

.calculator-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-5);
}

.calculator-toolbar .eyebrow,
.calculator-toolbar h2 {
  margin-bottom: 0;
}

.calculator-toolbar h2 {
  margin-top: var(--space-2);
  font-size: clamp(1.15rem, 2.6vw, 1.45rem);
}

.calculator-modes,
.angle-toggle {
  display: inline-flex;
  padding: 0.25rem;
  border: 1px solid rgba(0, 87, 168, 0.14);
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.85);
}

.calculator-mode,
.angle-toggle__button {
  min-height: 2.5rem;
  padding: 0.5rem 0.9rem;
  border: 0;
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--color-text-soft);
  font-weight: 800;
  transition: background-color 160ms ease, color 160ms ease, box-shadow 160ms ease;
}

.calculator-mode.is-active,
.angle-toggle__button.is-active {
  background: var(--color-primary-dark);
  color: #fff;
  box-shadow: 0 8px 18px rgba(15, 53, 87, 0.18);
}

.calculator-display {
  display: grid;
  gap: var(--space-3);
  min-height: 15rem;
  padding: var(--space-5);
  background:
    radial-gradient(circle at top right, rgba(120, 191, 232, 0.2), transparent 35%),
    linear-gradient(145deg, #0f3557 0%, #102d47 100%);
  color: #fff;
}

.calculator-display__top {
  display: flex;
  justify-content: space-between;
  gap: var(--space-3);
  color: rgba(255, 255, 255, 0.72);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.calculator-display__previous {
  display: grid;
  gap: 0.2rem;
  min-height: 2.8rem;
  text-align: right;
  overflow-wrap: anywhere;
}

.calculator-display__previous span,
.calculator-display__label {
  color: rgba(255, 255, 255, 0.62);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.calculator-display__previous strong {
  color: rgba(255, 255, 255, 0.82);
  font-size: 0.95rem;
  font-weight: 600;
}

.calculator-display__current {
  display: grid;
  gap: 0.35rem;
}

.calculator-display__expression {
  align-self: end;
  width: 100%;
  min-height: 4.2rem;
  max-height: 8.6rem;
  overflow: auto;
  color: #fff;
  font-size: clamp(2.15rem, 7vw, 4rem);
  font-weight: 800;
  line-height: 1.08;
  text-align: right;
  overflow-wrap: anywhere;
  cursor: text;
  user-select: text;
  scrollbar-width: thin;
}

.calculator-display__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  min-height: 2.7rem;
}

.calculator-feedback {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  min-height: 1.5rem;
  margin: 0;
  color: rgba(255, 255, 255, 0.78);
  font-size: 0.9rem;
  font-weight: 700;
}

.calculator-feedback:not(:empty)::before {
  content: "i";
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  justify-content: center;
  width: 1.25rem;
  height: 1.25rem;
  border: 1px solid currentColor;
  border-radius: 50%;
  font-size: 0.72rem;
  font-weight: 900;
}

.calculator-feedback[data-state="error"] {
  color: #ffd7cf;
}

.calculator-feedback[data-state="error"]::before {
  content: "!";
}

.calculator-feedback[data-state="success"] {
  color: #c8f5df;
}

.calculator-feedback[data-state="success"]::before {
  content: "✓";
}

.calculator-result-actions {
  display: flex;
  flex: 0 0 auto;
  gap: var(--space-2);
}

.calculator-display-action {
  min-height: 2.45rem;
  padding: 0.45rem 0.75rem;
  border: 1px solid rgba(255, 255, 255, 0.24);
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.08);
  color: rgba(255, 255, 255, 0.9);
  font-size: 0.82rem;
  font-weight: 800;
}

.calculator-display-action:hover:not(:disabled),
.calculator-display-action:focus-visible {
  border-color: rgba(255, 255, 255, 0.5);
  background: rgba(255, 255, 255, 0.16);
}

.calculator-display-action--primary {
  background: rgba(255, 255, 255, 0.96);
  color: var(--color-primary-dark);
}

.calculator-display-action--primary:hover:not(:disabled) {
  background: #fff;
  color: var(--color-primary);
}

.calculator-display-action:disabled {
  cursor: not-allowed;
  opacity: 0.42;
}

.scientific-panel {
  border-top: 1px solid rgba(0, 87, 168, 0.1);
  padding: var(--space-4) var(--space-5) 0;
}

.scientific-panel__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
  color: var(--color-primary-dark);
  font-size: 0.9rem;
  font-weight: 800;
}

.angle-toggle__button {
  min-height: 2.1rem;
  padding: 0.35rem 0.7rem;
  font-size: 0.78rem;
}

.scientific-keypad,
.calculator-keypad {
  display: grid;
  gap: 0.7rem;
}

.scientific-keypad {
  grid-template-columns: repeat(6, minmax(0, 1fr));
}

.calculator-keypad {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  padding: var(--space-4) var(--space-5) var(--space-5);
}

.calculator-key {
  min-width: 0;
  min-height: 4rem;
  padding: 0.65rem 0.4rem;
  border: 1px solid rgba(0, 87, 168, 0.13);
  border-radius: 1rem;
  background: rgba(255, 255, 255, 0.96);
  color: var(--color-primary-dark);
  box-shadow: 0 8px 18px rgba(15, 53, 87, 0.055);
  font-size: 1.18rem;
  font-weight: 800;
  line-height: 1;
  transition: transform 120ms ease, border-color 120ms ease, background-color 120ms ease, box-shadow 120ms ease;
  touch-action: manipulation;
}

.calculator-key:hover {
  border-color: rgba(0, 87, 168, 0.3);
  background: #fff;
  box-shadow: 0 12px 24px rgba(15, 53, 87, 0.09);
  transform: translateY(-1px);
}

.calculator-key:active {
  transform: translateY(1px);
}

.calculator-key--function {
  min-height: 3.25rem;
  background: rgba(234, 244, 251, 0.95);
  font-size: 0.96rem;
}

.calculator-key--operator {
  border-color: rgba(0, 87, 168, 0.2);
  background: linear-gradient(180deg, #eaf4fb 0%, #dceef9 100%);
  color: var(--color-primary);
  font-size: 1.4rem;
}

.calculator-key--action,
.calculator-key--percent {
  background: #f3f7fa;
  color: var(--color-text-soft);
}

.calculator-key--danger {
  border-color: rgba(163, 58, 45, 0.16);
  background: #fff2ef;
  color: #a33a2d;
}

.calculator-key--equals {
  border-color: transparent;
  background: linear-gradient(180deg, #0d6fc8 0%, var(--color-primary) 100%);
  color: #fff;
  box-shadow: 0 12px 24px rgba(0, 87, 168, 0.22);
}

.calculator-key--equals:hover {
  border-color: transparent;
  background: var(--color-primary-dark);
  color: #fff;
}

.calculator-side {
  display: grid;
  gap: var(--space-4);
}

.calculator-history,
.calculator-shortcuts {
  min-width: 0;
}

.calculator-history__header {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: var(--space-3);
}

.calculator-history__header .eyebrow,
.calculator-history__header h2,
.calculator-shortcuts .eyebrow,
.calculator-shortcuts h2 {
  margin-bottom: 0;
}

.calculator-history__header h2,
.calculator-shortcuts h2 {
  margin-top: var(--space-2);
  font-size: 1.15rem;
}

.calculator-history__clear {
  padding: 0.45rem 0.7rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: #fff;
  color: var(--color-text-soft);
  font-size: 0.8rem;
  font-weight: 800;
}

.calculator-history__list {
  display: grid;
  gap: var(--space-3);
  margin-top: var(--space-4);
  list-style: none;
}

.calculator-history__item {
  display: grid;
  gap: 0.25rem;
  padding: var(--space-3);
  border: 1px solid rgba(0, 87, 168, 0.12);
  border-radius: 0.9rem;
  background: rgba(234, 244, 251, 0.52);
}

.calculator-history__item span {
  color: var(--color-text-soft);
  font-size: 0.86rem;
  overflow-wrap: anywhere;
}

.calculator-history__item strong {
  color: var(--color-primary-dark);
  font-size: 1rem;
  text-align: right;
  overflow-wrap: anywhere;
}

.calculator-history__empty {
  color: var(--color-text-soft);
}

.calculator-shortcuts dl {
  display: grid;
  gap: var(--space-3);
  margin: var(--space-4) 0 0;
}

.calculator-shortcuts dl div {
  display: grid;
  gap: 0.35rem;
  padding-bottom: var(--space-3);
  border-bottom: 1px solid rgba(0, 87, 168, 0.1);
}

.calculator-shortcuts dl div:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.calculator-shortcuts dt {
  color: var(--color-primary-dark);
  font-weight: 800;
}

.calculator-shortcuts dd {
  margin: 0;
  color: var(--color-text-soft);
}

kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.8rem;
  min-height: 1.7rem;
  padding: 0.15rem 0.4rem;
  border: 1px solid var(--color-border-strong);
  border-bottom-width: 2px;
  border-radius: 0.4rem;
  background: #fff;
  color: var(--color-primary-dark);
  font-family: inherit;
  font-size: 0.78rem;
  font-weight: 800;
}

@media (max-width: 980px) {
  .calculator-hero__grid,
  .calculator-tool-layout {
    grid-template-columns: 1fr;
  }

  .seo-support-grid {
    grid-template-columns: 1fr;
  }

  .calculator-side {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .calculator-shell {
    max-width: 52rem;
    width: 100%;
    margin: 0 auto;
  }
}

@media (max-width: 720px) {
  .calculator-toolbar,
  .scientific-panel__header {
    align-items: stretch;
    flex-direction: column;
  }

  .calculator-modes {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .scientific-panel__header {
    gap: var(--space-2);
  }

  .angle-toggle {
    align-self: start;
  }

  .scientific-keypad {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .calculator-display__footer {
    align-items: stretch;
    flex-direction: column;
  }

  .calculator-result-actions {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .calculator-side {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 520px) {
  .calculator-tool-section {
    padding-top: var(--space-5);
  }

  .calculator-toolbar,
  .calculator-display,
  .scientific-panel {
    padding-right: var(--space-4);
    padding-left: var(--space-4);
  }

  .calculator-keypad {
    gap: 0.55rem;
    padding: var(--space-4);
  }

  .scientific-keypad {
    gap: 0.55rem;
  }

  .calculator-key {
    min-height: 3.8rem;
    border-radius: 0.85rem;
  }

  .calculator-key--function {
    min-height: 3.35rem;
  }

  .calculator-display {
    min-height: 15.5rem;
  }

  .calculator-display__top {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.25rem;
  }

  .calculator-display__expression {
    max-height: 7.2rem;
    font-size: clamp(2rem, 12vw, 3rem);
  }

  .calculator-display-action {
    min-height: 2.8rem;
  }
}

@media (max-width: 360px) {
  .calculator-keypad,
  .scientific-keypad {
    gap: 0.4rem;
  }

  .calculator-key {
    min-height: 3.55rem;
    font-size: 1.05rem;
  }

  .calculator-key--function {
    font-size: 0.86rem;
  }
}