/* ============================================================
   Time Duration Calculator — WordPress Plugin Stylesheet
   Design: Deep navy + electric cyan + warm amber accents
   ============================================================ */

/* --- Tokens --- */
:root {
  --tdc-bg:          #0f1623;
  --tdc-card:        #161e2e;
  --tdc-card-hover:  #1c2740;
  --tdc-border:      #243048;
  --tdc-border-focus:#3b82f6;
  --tdc-text:        #e2e8f0;
  --tdc-muted:       #64748b;
  --tdc-label:       #94a3b8;
  --tdc-cyan:        #22d3ee;
  --tdc-cyan-dim:    rgba(34,211,238,0.12);
  --tdc-amber:       #f59e0b;
  --tdc-green:       #4ade80;
  --tdc-red:         #f87171;
  --tdc-btn-from:    #2563eb;
  --tdc-btn-to:      #0ea5e9;
  --tdc-result-bg:   #1a253a;
  --tdc-radius:      12px;
  --tdc-radius-sm:   8px;
  --tdc-shadow:      0 4px 24px rgba(0,0,0,0.35);
  --tdc-font:        -apple-system, 'Inter', 'Segoe UI', sans-serif;
  --tdc-mono:        'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  --tdc-transition:  0.2s ease;
}

/* --- Wrap --- */
.tdc-wrap {
  font-family: var(--tdc-font);
  background: var(--tdc-bg);
  border: 1px solid var(--tdc-border);
  border-radius: 20px;
  max-width: 780px;
  margin: 2rem auto;
  padding: 0;
  overflow: hidden;
  box-shadow: var(--tdc-shadow);
  color: var(--tdc-text);
}

/* --- Header --- */
.tdc-header {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 28px 32px 22px;
  background: linear-gradient(135deg, #131c2f 0%, #0f1623 100%);
  border-bottom: 1px solid var(--tdc-border);
}

.tdc-header-icon {
  width: 52px;
  height: 52px;
  background: var(--tdc-cyan-dim);
  border: 1px solid rgba(34,211,238,0.25);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--tdc-cyan);
  flex-shrink: 0;
}

.tdc-title {
  font-size: 1.45rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--tdc-text);
  margin: 0 0 2px;
  padding: 0;
  line-height: 1.2;
  border: none;
}

.tdc-subtitle {
  font-size: 0.82rem;
  color: var(--tdc-muted);
  margin: 0;
  padding: 0;
}

/* --- Tabs --- */
.tdc-tabs {
  display: flex;
  background: var(--tdc-card);
  border-bottom: 1px solid var(--tdc-border);
  padding: 0 32px;
  gap: 4px;
}

.tdc-tab {
  background: none;
  border: none;
  color: var(--tdc-muted);
  font-size: 0.85rem;
  font-weight: 500;
  padding: 14px 18px;
  cursor: pointer;
  position: relative;
  transition: color var(--tdc-transition);
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  font-family: var(--tdc-font);
}

.tdc-tab:hover {
  color: var(--tdc-text);
}

.tdc-tab--active {
  color: var(--tdc-cyan);
  border-bottom-color: var(--tdc-cyan);
}

/* --- Panels --- */
.tdc-panel {
  display: none;
  padding: 28px 32px 32px;
  animation: tdc-fade-in 0.25s ease;
}

.tdc-panel--active {
  display: block;
}

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

/* --- Card --- */
.tdc-card {
  background: var(--tdc-card);
  border: 1px solid var(--tdc-border);
  border-radius: var(--tdc-radius);
  padding: 24px;
  margin-bottom: 20px;
}

/* --- Inputs Grid --- */
.tdc-inputs-grid {
  display: grid;
  grid-template-columns: 1fr 40px 1fr;
  align-items: end;
  gap: 12px;
  margin-bottom: 20px;
}

.tdc-swap-col {
  display: flex;
  justify-content: center;
  padding-bottom: 4px;
}

.tdc-swap-btn {
  width: 36px;
  height: 36px;
  background: var(--tdc-card-hover);
  border: 1px solid var(--tdc-border);
  border-radius: 50%;
  color: var(--tdc-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--tdc-transition);
}

.tdc-swap-btn:hover {
  color: var(--tdc-cyan);
  border-color: var(--tdc-cyan);
  background: var(--tdc-cyan-dim);
}

/* --- Field Group --- */
.tdc-field-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 16px;
}

.tdc-field-group--inline {
  flex: 1;
}

.tdc-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--tdc-label);
}

.tdc-label-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  display: inline-block;
}

.tdc-label-dot--green { background: var(--tdc-green); }
.tdc-label-dot--red   { background: var(--tdc-red); }

/* --- Inputs --- */
.tdc-input {
  background: #0f1623;
  border: 1px solid var(--tdc-border);
  border-radius: var(--tdc-radius-sm);
  color: var(--tdc-text);
  font-size: 0.92rem;
  font-family: var(--tdc-font);
  padding: 10px 12px;
  transition: border-color var(--tdc-transition), box-shadow var(--tdc-transition);
  outline: none;
  width: 100%;
  box-sizing: border-box;
  -webkit-appearance: none;
  appearance: none;
}

.tdc-input:focus {
  border-color: var(--tdc-border-focus);
  box-shadow: 0 0 0 3px rgba(59,130,246,0.18);
}

.tdc-datetime-row {
  display: flex;
  gap: 8px;
}

.tdc-input--date { flex: 1 1 auto; min-width: 0; }
.tdc-input--time { flex: 0 0 auto; width: 120px; }

.tdc-input--num {
  text-align: center;
  padding: 8px 6px;
  font-family: var(--tdc-mono);
  font-size: 1rem;
}

/* Fix native date/time pickers in dark mode */
.tdc-input::-webkit-calendar-picker-indicator {
  filter: invert(0.7);
  cursor: pointer;
}

input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
  opacity: 0.4;
}

/* --- Options Row --- */
.tdc-options-row {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 20px;
  padding-top: 4px;
}

/* --- Checkboxes --- */
.tdc-checkbox-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--tdc-label);
  cursor: pointer;
  user-select: none;
}

.tdc-checkbox-label input[type="checkbox"] {
  display: none;
}

.tdc-checkbox-custom {
  width: 16px;
  height: 16px;
  background: #0f1623;
  border: 1.5px solid var(--tdc-border);
  border-radius: 4px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all var(--tdc-transition);
  position: relative;
}

.tdc-checkbox-label input[type="checkbox"]:checked + .tdc-checkbox-custom {
  background: var(--tdc-cyan);
  border-color: var(--tdc-cyan);
}

.tdc-checkbox-label input[type="checkbox"]:checked + .tdc-checkbox-custom::after {
  content: '';
  width: 9px;
  height: 5px;
  border-left: 2px solid #0f1623;
  border-bottom: 2px solid #0f1623;
  transform: rotate(-45deg) translate(1px, -1px);
  display: block;
}

/* --- Radio Buttons --- */
.tdc-operation-row {
  display: flex;
  gap: 24px;
  margin-bottom: 20px;
}

.tdc-radio-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--tdc-label);
  cursor: pointer;
  user-select: none;
}

.tdc-radio-label input[type="radio"] { display: none; }

.tdc-radio-custom {
  width: 16px;
  height: 16px;
  background: #0f1623;
  border: 1.5px solid var(--tdc-border);
  border-radius: 50%;
  display: inline-block;
  flex-shrink: 0;
  position: relative;
  transition: all var(--tdc-transition);
}

.tdc-radio-label input[type="radio"]:checked + .tdc-radio-custom {
  border-color: var(--tdc-cyan);
}

.tdc-radio-label input[type="radio"]:checked + .tdc-radio-custom::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 7px;
  height: 7px;
  background: var(--tdc-cyan);
  border-radius: 50%;
}

/* --- Unit Pills --- */
.tdc-units-section {
  margin-bottom: 20px;
}

.tdc-units-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--tdc-muted);
  margin: 0 0 10px;
}

.tdc-units-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tdc-unit-pill {
  cursor: pointer;
  user-select: none;
}

.tdc-unit-pill input[type="checkbox"] { display: none; }

.tdc-unit-pill span {
  display: inline-block;
  padding: 5px 14px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 500;
  border: 1px solid var(--tdc-border);
  color: var(--tdc-muted);
  background: #0f1623;
  transition: all var(--tdc-transition);
}

.tdc-unit-pill input[type="checkbox"]:checked + span {
  background: var(--tdc-cyan-dim);
  border-color: var(--tdc-cyan);
  color: var(--tdc-cyan);
}

.tdc-unit-pill:hover span {
  border-color: var(--tdc-border-focus);
  color: var(--tdc-text);
}

/* --- Button --- */
.tdc-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--tdc-btn-from), var(--tdc-btn-to));
  color: #fff;
  border: none;
  border-radius: var(--tdc-radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  font-family: var(--tdc-font);
  padding: 12px 28px;
  cursor: pointer;
  width: 100%;
  letter-spacing: 0.01em;
  transition: opacity var(--tdc-transition), transform var(--tdc-transition);
  margin-top: 4px;
}

.tdc-btn:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

.tdc-btn:active {
  transform: translateY(0);
}

/* --- Results --- */
.tdc-results {
  background: var(--tdc-result-bg);
  border: 1px solid var(--tdc-border);
  border-radius: var(--tdc-radius);
  overflow: hidden;
  animation: tdc-fade-in 0.3s ease;
}

.tdc-results-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--tdc-border);
}

.tdc-results-meta {
  font-size: 0.8rem;
  color: var(--tdc-muted);
  line-height: 1.5;
}

.tdc-results-meta strong {
  color: var(--tdc-text);
  font-weight: 600;
}

.tdc-copy-btn {
  display: flex;
  align-items: center;
  gap: 5px;
  background: var(--tdc-card-hover);
  border: 1px solid var(--tdc-border);
  border-radius: 6px;
  color: var(--tdc-muted);
  font-size: 0.75rem;
  font-family: var(--tdc-font);
  padding: 5px 10px;
  cursor: pointer;
  transition: all var(--tdc-transition);
}

.tdc-copy-btn:hover {
  color: var(--tdc-text);
  border-color: var(--tdc-cyan);
}

/* --- Results Grid --- */
.tdc-results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 1px;
  background: var(--tdc-border);
}

.tdc-result-tile {
  background: var(--tdc-result-bg);
  padding: 20px 16px;
  text-align: center;
  transition: background var(--tdc-transition);
}

.tdc-result-tile:hover {
  background: var(--tdc-card-hover);
}

.tdc-result-value {
  display: block;
  font-family: var(--tdc-mono);
  font-size: 1.55rem;
  font-weight: 700;
  color: var(--tdc-cyan);
  line-height: 1;
  margin-bottom: 6px;
  letter-spacing: -0.02em;
}

.tdc-result-label {
  display: block;
  font-size: 0.73rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--tdc-muted);
}

/* Large highlight tile (days) */
.tdc-result-tile--highlight .tdc-result-value {
  font-size: 2.2rem;
  color: var(--tdc-amber);
}

/* Add/Subtract result */
.tdc-as-result {
  padding: 28px 24px;
  text-align: center;
}

.tdc-as-result-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--tdc-muted);
  margin-bottom: 8px;
}

.tdc-as-result-date {
  font-family: var(--tdc-mono);
  font-size: 1.9rem;
  font-weight: 700;
  color: var(--tdc-cyan);
  letter-spacing: -0.02em;
  margin-bottom: 6px;
}

.tdc-as-result-day {
  font-size: 0.85rem;
  color: var(--tdc-muted);
}

/* --- Hours Row --- */
.tdc-hours-row {
  display: flex;
  gap: 16px;
  margin-bottom: 20px;
}

/* --- Duration Inputs --- */
.tdc-duration-inputs {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 8px;
  margin-bottom: 20px;
}

.tdc-dur-field {
  display: flex;
  flex-direction: column;
  gap: 5px;
  align-items: center;
}

.tdc-dur-label {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--tdc-muted);
  text-align: center;
}

/* --- Error State --- */
.tdc-error {
  background: rgba(248,113,113,0.1);
  border: 1px solid rgba(248,113,113,0.3);
  border-radius: var(--tdc-radius-sm);
  color: var(--tdc-red);
  font-size: 0.83rem;
  padding: 10px 14px;
  margin-top: 12px;
  display: none;
}

/* --- Responsive --- */
@media (max-width: 620px) {
  .tdc-wrap { margin: 1rem; border-radius: 14px; }
  .tdc-header { padding: 20px 20px 16px; }
  .tdc-panel { padding: 20px 16px 24px; }
  .tdc-card { padding: 16px; }
  .tdc-tabs { padding: 0 16px; }

  .tdc-inputs-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .tdc-swap-col { display: none; }

  .tdc-datetime-row { flex-direction: column; }
  .tdc-input--time { width: 100%; }

  .tdc-hours-row { flex-direction: column; gap: 12px; }

  .tdc-duration-inputs {
    grid-template-columns: repeat(4, 1fr);
  }

  .tdc-results-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 400px) {
  .tdc-duration-inputs {
    grid-template-columns: repeat(2, 1fr);
  }
}