/* Project-specific styles only. Site-wide tokens/classes live in /assets/site/theme.css. */

.app-page {
  display: grid;
  gap: 22px;
}

.app-header {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 16px;
  padding: 30px 0 18px;
  border-bottom: 1px solid var(--site-border);
}

.app-header .site-title {
  max-width: none;
  font-size: clamp(2.35rem, 8vw, 3.65rem);
}

.workbench {
  --eq-blue-soft: color-mix(in srgb, var(--site-accent) 13%, var(--site-surface));
  --eq-green-soft: color-mix(in srgb, #188553 14%, var(--site-surface));
  --eq-amber-soft: color-mix(in srgb, #b16a00 15%, var(--site-surface));
  --eq-red-soft: color-mix(in srgb, var(--site-danger) 12%, var(--site-surface));
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.9fr);
  gap: 16px;
  align-items: start;
}

.builder-panel,
.solution-panel {
  border: 1px solid var(--site-border);
  border-radius: var(--site-radius);
  background: var(--site-surface);
  padding: 16px;
}

.panel-topline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.panel-topline h2 {
  margin: 0;
  font-size: 1rem;
  letter-spacing: 0;
}

.step-picker {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--site-muted);
  font-size: 0.86rem;
  font-weight: 700;
}

.step-options {
  display: grid;
  grid-template-columns: repeat(8, minmax(28px, 1fr));
  gap: 4px;
}

.step-option {
  min-width: 28px;
  min-height: 30px;
  border: 1px solid var(--site-border);
  border-radius: var(--site-radius-sm);
  background: var(--site-surface-strong);
  color: var(--site-muted);
  cursor: pointer;
}

.step-option:hover {
  border-color: var(--site-border-strong);
  color: var(--site-text);
}

.step-option.is-active {
  border-color: var(--site-accent);
  background: var(--site-accent);
  color: #ffffff;
}

.equation-screen {
  min-height: 116px;
  display: grid;
  align-content: center;
  gap: 8px;
  margin-bottom: 14px;
  padding: 16px;
  border: 1px solid var(--site-border);
  border-radius: var(--site-radius);
  background:
    linear-gradient(90deg, transparent 0 18px, color-mix(in srgb, var(--site-border) 45%, transparent) 18px 19px, transparent 19px 38px),
    var(--site-surface-strong);
  overflow: hidden;
}

.screen-label {
  color: var(--site-subtle);
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
}

.equation-value {
  min-height: 42px;
  overflow-wrap: anywhere;
  color: var(--site-text);
  font-size: 1.65rem;
  font-weight: 800;
  line-height: 1.25;
}

.keypad {
  display: grid;
  grid-template-columns: minmax(260px, 1fr) minmax(210px, 0.72fr);
  gap: 12px;
}

.key-group {
  display: grid;
  gap: 8px;
}

.number-keys {
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.letter-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
}

.key {
  min-width: 0;
  min-height: 46px;
  aspect-ratio: 1.35 / 1;
  border: 1px solid var(--site-border);
  border-radius: var(--site-radius-sm);
  background: var(--site-surface);
  color: var(--site-text);
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: 0;
  cursor: pointer;
}

.key:hover {
  border-color: var(--site-border-strong);
  background: var(--site-surface-strong);
}

.key:focus-visible,
.step-option:focus-visible {
  outline: 2px solid var(--site-accent);
  outline-offset: 2px;
}

.key-number {
  background: var(--eq-green-soft);
}

.key-operator {
  background: var(--eq-amber-soft);
}

.key-action {
  background: var(--site-accent);
  border-color: var(--site-accent);
  color: #ffffff;
}

.key-action:hover {
  background: var(--site-accent-strong);
  color: #ffffff;
}

.key-muted {
  background: var(--eq-blue-soft);
  color: var(--site-muted);
}

.key-wide {
  grid-column: span 3;
  aspect-ratio: auto;
}

.result-chip {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 3px 8px;
  border: 1px solid var(--site-border);
  border-radius: var(--site-radius-sm);
  background: var(--site-surface-strong);
  color: var(--site-muted);
  font-size: 0.82rem;
  font-weight: 800;
}

.result-chip.is-solved {
  border-color: color-mix(in srgb, #188553 42%, var(--site-border));
  background: var(--eq-green-soft);
  color: var(--site-text);
}

.result-chip.is-error {
  border-color: color-mix(in srgb, var(--site-danger) 44%, var(--site-border));
  background: var(--eq-red-soft);
  color: var(--site-danger);
}

.steps-list {
  display: grid;
  gap: 10px;
  min-height: 310px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: steps;
}

.steps-list li {
  counter-increment: steps;
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  padding: 10px;
  border: 1px solid var(--site-border);
  border-radius: var(--site-radius-sm);
  background: var(--site-surface-strong);
}

.steps-list li::before {
  content: counter(steps);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: var(--site-radius-sm);
  background: var(--site-text);
  color: var(--site-bg);
  font-weight: 800;
}

.step-title {
  display: block;
  margin-bottom: 2px;
  color: var(--site-text);
  font-size: 0.9rem;
  font-weight: 800;
}

.step-body {
  display: block;
  overflow-wrap: anywhere;
  color: var(--site-muted);
}

.status-line {
  min-height: 24px;
  margin: 12px 0 0;
  color: var(--site-subtle);
  font-size: 0.86rem;
}

@media (max-width: 920px) {
  .workbench,
  .keypad {
    grid-template-columns: 1fr;
  }

  .letter-grid {
    grid-template-columns: repeat(7, minmax(0, 1fr));
  }

  .steps-list {
    min-height: auto;
  }
}

@media (max-width: 680px) {
  .app-header,
  .panel-topline,
  .step-picker {
    align-items: flex-start;
    flex-direction: column;
  }

  .step-options {
    grid-template-columns: repeat(4, minmax(34px, 1fr));
  }

  .letter-grid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .key {
    aspect-ratio: auto;
    min-height: 44px;
  }

  .key-wide {
    grid-column: span 2;
  }
}