/* ===== Import Inter font ===== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

/* ===== Design tokens ===== */
.derived-widget {
  --derived-primary: #1a73e8;          /* was #2e7d32 */
  --derived-primary-hover: #1557b0;    /* was #1b5e20 */
  --derived-bg: #ffffff;
  --derived-sidebar-bg: #f8f9fa;
  --derived-border: #dadce0;
  --derived-text: #202124;
  --derived-text-light: #5f6368;
  --derived-selected-bg: #e8f0fe;     /* was #e8f5e9 */
  --derived-radius: 12px;
  --derived-radius-small: 8px;
  --derived-shadow: 0 2px 8px rgba(0,0,0,0.06);
  --derived-font: 'Inter', sans-serif;
  --derived-font-size-sm: 0.875rem;
  --derived-font-size: 1rem;
  --derived-font-size-lg: 2rem;
  --derived-gap: 1.25rem;
  --derived-padding: 0.5rem 0.75rem;

  font-family: var(--derived-font);
  color: #202124 !important;      /* force dark text, override theme */
  background: #ffffff;
  padding: 0;
  box-shadow: 0 8px 24px rgba(0,0,0,0.06);
  border-radius: 16px;
}

/* ===== Card ===== */
.derived-card {
  background: transparent;
  box-shadow: none;
  padding: 1.5rem;
}

/* ===== Mode & solve selector row ===== */
.derived-mode-selector {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: var(--derived-gap);
  flex-wrap: wrap;
}

.derived-mode-selector label {
  font-weight: 600;
  color: var(--derived-text);
  white-space: nowrap;
}

.derived-mode-dropdown {
  flex: 1 1 auto;
  min-width: 180px;
  padding: 0.6rem 0.8rem;
  border: 1px solid var(--derived-border);
  border-radius: var(--derived-radius-small);
  font-family: inherit;
  background: white;
  font-size: var(--derived-font-size);
  transition: border-color 0.2s;
  appearance: auto;
}

.derived-mode-dropdown:focus {
  border-color: var(--derived-primary);
  outline: none;
  box-shadow: 0 0 0 3px rgba(26,115,232,0.15);
}

/* ===== Solve selector (custom anchored dropdown) ===== */
.derived-solve-selector {
  position: relative;
  flex-shrink: 0;
}

.derived-solve-btn {
  background: white;
  border: 1px solid var(--derived-border);
  border-radius: 20px;
  padding: 0.5rem 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: var(--derived-font-size-sm);
  font-family: inherit;
  white-space: nowrap;
  font-weight: 500;
  transition: background 0.2s, border-color 0.2s;
}

.derived-solve-btn:hover {
  background: var(--derived-selected-bg);
  border-color: var(--derived-primary);
}

.derived-solve-btn:focus-visible {
  outline: 2px solid var(--derived-primary);
  outline-offset: 2px;
}

/* ===== Two‑column form ===== */
.derived-form {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--derived-gap);
}

/* ===== Inputs & output cards ===== */
.derived-inputs {
  display: flex;
  flex-direction: column;
  gap: var(--derived-gap);
}

.derived-input-card,
.derived-output-card {
  background: var(--derived-sidebar-bg);
  border-radius: var(--derived-radius);
  padding: 1.25rem;
  border: 1px solid var(--derived-border);
}

.derived-input-label,
.derived-output-label {
  font-size: var(--derived-font-size-sm);
  color: var(--derived-text-light);
  margin-bottom: 0.5rem;
  display: block;
  font-weight: 500;
}

/* ===== First row: value + copy button ===== */
.derived-output-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0.5rem 0 0.25rem 0;   /* smaller bottom margin */
}

/* ===== Second row: unit selector alone ===== */
.derived-output-unit-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.25rem;
  margin-bottom: 0.5rem;
}

.derived-input-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.derived-input-field {
  width: 140px;
  padding: 0.6rem 0.8rem;
  border: 1px solid var(--derived-border);
  border-radius: var(--derived-radius-small);
  font-size: 1.25rem;
  font-weight: 500;
  background: white;
  font-family: inherit;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.derived-input-field:focus {
  border-color: var(--derived-primary);
  outline: none;
  box-shadow: 0 0 0 3px rgba(26,115,232,0.15);
}

/* ===== Output value box – mimics input field ===== */
.derived-output-value-box {
  display: inline-flex;
  align-items: center;
  min-width: 140px;                   /* matches input field width */
  max-width: 300px;                   /* prevents excessive stretching */
  padding: 0.6rem 0.8rem;
  border: 1px solid var(--derived-border);
  border-radius: var(--derived-radius-small);
  background: white;
  box-sizing: border-box;
  overflow: hidden;                   /* clips text */
  white-space: nowrap;                /* keeps single line */
}

/* ===== Unit selector (custom anchored dropdown) ===== */
.derived-unit-selector-wrapper {
  position: relative;
}

.derived-unit-selector {
  background: white;
  border: 1px solid var(--derived-border);
  border-radius: 20px;
  padding: 0.5rem 0.8rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: var(--derived-font-size-sm);
  font-family: inherit;
  white-space: nowrap;
  font-weight: 500;
  transition: background 0.2s, border-color 0.2s;
  max-width: 250px;               /* relaxed constraint */
}

.derived-unit-selector .derived-unit-code {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  display: block;                       /* ensures the span respects the overflow */
}

.derived-unit-selector:hover {
  background: var(--derived-selected-bg);
  border-color: var(--derived-primary);
}

.derived-unit-selector:focus-visible {
  outline: 2px solid var(--derived-primary);
  outline-offset: 2px;
}

.derived-unit-arrow {
  width: 12px;
  height: 12px;
  flex-shrink: 0;
}

/* Dropdown dialogs */
.derived-unit-dialog {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  width: auto;
  min-width: 200px;
  max-width: 300px;
  max-height: 250px;
  overflow-y: auto;
  background: white;
  border: 1px solid var(--derived-border);
  border-radius: var(--derived-radius);
  box-shadow: 0 8px 16px rgba(0,0,0,0.12);
  z-index: 100;
  display: block;
}

.derived-unit-dialog[hidden] {
  display: none;
}

.derived-unit-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.derived-unit-item {
  padding: 0.5rem 0.75rem;
  cursor: pointer;
  font-size: var(--derived-font-size-sm);
  white-space: nowrap;
  transition: background 0.1s;
}

.derived-unit-item:hover {
  background: var(--derived-selected-bg);
}

/* ===== Output ===== */
.derived-output {
  display: flex;
  align-items: stretch;
}

.derived-output-card {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.derived-output-value {
  font-size: 1.625rem;   /* exactly 2px larger than 1.5rem (24px → 26px) */
  font-weight: 700;
  color: #202124;        /* black (same as main converter text) */
  transition: transform 0.2s;
  line-height: 1.2;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ===== Formula badge ===== */
.derived-formula {
  display: inline-block;
  background: #e8f0fe;               /* was #e8f5e9 */
  color: #1a73e8;                    /* was #2e7d32 */
  padding: 0.3rem 0.8rem;
  border-radius: 16px;
  font-size: var(--derived-font-size-sm);
  margin: 0.5rem 0 0 0;
  font-weight: 500;
}

/* ===== Copy button ===== */
.derived-copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.4rem 0.8rem;
  background: white;
  border: 1px solid var(--derived-border);
  border-radius: 20px;                     /* pill shape */
  font-family: inherit;
  font-size: var(--derived-font-size-sm);
  color: var(--derived-text);
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.2s, border-color 0.2s, color 0.2s;
}

.derived-copy-btn:hover {
  background: var(--derived-selected-bg);
  border-color: var(--derived-primary);
  color: var(--derived-primary);
}

.derived-copy-btn:active {
  background: #d2e3fc;
}

.derived-copy-btn:focus-visible {
  outline: 2px solid var(--derived-primary);
  outline-offset: 2px;
}

.derived-copy-text {
  font-weight: 500;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .derived-widget {
    margin: 0;
    padding: 1rem;
  }

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

  .derived-mode-selector {
    flex-direction: column;
    align-items: stretch;
  }

  .derived-solve-selector {
    align-self: flex-end;
  }
}