/* ── Online 10-Key Calculator – Styles ──────────────────────────────────── */

.tenkey-wrap {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  max-width: 860px;
  margin: 2rem auto;
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 16px;
  padding: 2rem;
  box-shadow: 0 4px 28px rgba(0,0,0,0.08);
  color: #1e293b;
}

/* ── Header ─────────────────────────────────────────────────────────────── */

.tenkey__header {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.tenkey__icon {
  font-size: 2.4rem;
  line-height: 1;
  flex-shrink: 0;
}

.tenkey__title {
  font-size: 1.55rem;
  font-weight: 800;
  margin: 0 0 0.25rem;
  color: #0f172a;
}

.tenkey__desc {
  font-size: 0.88rem;
  color: #64748b;
  margin: 0;
  line-height: 1.5;
}

/* ── Info box ────────────────────────────────────────────────────────────── */

.tenkey__info-box {
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  border-radius: 10px;
  padding: 0.85rem 1.1rem;
  font-size: 0.86rem;
  color: #1e3a8a;
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

/* ── Two-column layout ───────────────────────────────────────────────────── */

.tenkey__layout {
  display: grid;
  grid-template-columns: 1fr 260px;
  gap: 1.5rem;
  align-items: start;
}

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

/* ── Tape column ─────────────────────────────────────────────────────────── */

.tenkey__tape-col {
  display: flex;
  flex-direction: column;
  gap: 0;
  border: 1.5px solid #e2e8f0;
  border-radius: 12px;
  overflow: hidden;
}

.tenkey__tape-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.65rem 1rem;
  background: #f8fafc;
  border-bottom: 1px solid #e2e8f0;
}

.tenkey__tape-label {
  font-size: 0.82rem;
  font-weight: 700;
  color: #374151;
}

.tenkey__tape-actions {
  display: flex;
  gap: 0.5rem;
}

.tenkey__tape-btn {
  padding: 0.28rem 0.75rem;
  border: 1.5px solid #cbd5e1;
  border-radius: 6px;
  background: #fff;
  color: #374151;
  font-size: 0.76rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}

.tenkey__tape-btn:hover {
  background: #f1f5f9;
  border-color: #94a3b8;
}

.tenkey__tape-btn--clear {
  border-color: #fca5a5;
  color: #dc2626;
}

.tenkey__tape-btn--clear:hover {
  background: #fef2f2;
  border-color: #f87171;
}

.tenkey__tape-scroll {
  min-height: 260px;
  max-height: 340px;
  overflow-y: auto;
  padding: 0.75rem 1rem;
  background: #fffef5;
  font-family: 'Courier New', Courier, monospace;
  font-size: 0.95rem;
}

.tenkey__tape-empty {
  color: #94a3b8;
  font-size: 0.82rem;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-style: italic;
  text-align: center;
  padding: 2rem 0;
}

/* Individual tape rows */
.tenkey__tape-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 0.15rem 0;
  border-bottom: 1px dashed #f1f5f9;
  gap: 0.5rem;
}

.tenkey__tape-row:last-child {
  border-bottom: none;
}

.tenkey__tape-row--op {
  color: #64748b;
}

.tenkey__tape-row--subtotal {
  border-top: 1px solid #cbd5e1;
  font-weight: 700;
  color: #7c3aed;
  padding-top: 0.35rem;
  margin-top: 0.15rem;
}

.tenkey__tape-row--total {
  border-top: 2px solid #0f172a;
  font-weight: 800;
  color: #0f172a;
  font-size: 1.05rem;
  padding-top: 0.4rem;
  margin-top: 0.2rem;
}

.tenkey__tape-row--neg .tenkey__tape-num {
  color: #dc2626;
}

.tenkey__tape-op {
  font-size: 0.8rem;
  color: #94a3b8;
  min-width: 16px;
}

.tenkey__tape-num {
  text-align: right;
  flex: 1;
}

.tenkey__tape-row--subtotal .tenkey__tape-op,
.tenkey__tape-row--total .tenkey__tape-op {
  color: inherit;
  font-size: 0.85rem;
}

/* Running total bar */
.tenkey__running-wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.65rem 1rem;
  background: #f5f3ff;
  border-top: 1.5px solid #ddd6fe;
}

.tenkey__running-label {
  font-size: 0.78rem;
  font-weight: 700;
  color: #7c3aed;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.tenkey__running-value {
  font-family: 'Courier New', Courier, monospace;
  font-size: 1.15rem;
  font-weight: 800;
  color: #7c3aed;
}

/* ── Calculator pad column ───────────────────────────────────────────────── */

.tenkey__pad-col {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

/* Display */
.tenkey__display-wrap {
  background: #0f172a;
  border-radius: 10px;
  padding: 0.75rem 1rem 0.6rem;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.1rem;
  min-height: 72px;
  position: relative;
}

.tenkey__display-op {
  font-size: 0.72rem;
  font-weight: 700;
  color: #7c3aed;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  min-height: 14px;
  align-self: flex-start;
}

.tenkey__display {
  font-family: 'Courier New', Courier, monospace;
  font-size: 1.85rem;
  font-weight: 700;
  color: #f0fdf4;
  text-align: right;
  width: 100%;
  word-break: break-all;
  line-height: 1.1;
}

.tenkey__display--negative {
  color: #fca5a5;
}

.tenkey__display-mem {
  font-size: 0.68rem;
  color: #fbbf24;
  font-weight: 700;
  letter-spacing: 0.08em;
  align-self: flex-start;
  min-height: 12px;
}

/* Decimal row */
.tenkey__dec-row {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex-wrap: wrap;
}

.tenkey__dec-label {
  font-size: 0.72rem;
  font-weight: 700;
  color: #64748b;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-right: 0.1rem;
}

.tenkey__dec-btn {
  width: 28px;
  height: 26px;
  border: 1.5px solid #cbd5e1;
  border-radius: 5px;
  background: #f8fafc;
  color: #374151;
  font-size: 0.8rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.tenkey__dec-btn:hover {
  border-color: #7c3aed;
  color: #7c3aed;
}

.tenkey__dec-btn--active {
  border-color: #7c3aed;
  background: #7c3aed;
  color: #fff;
}

.tenkey__sep-toggle {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  cursor: pointer;
  margin-left: auto;
}

.tenkey__sep-toggle input {
  width: 15px;
  height: 15px;
  accent-color: #7c3aed;
  cursor: pointer;
}

.tenkey__sep-toggle span {
  font-size: 0.8rem;
  font-weight: 700;
  color: #64748b;
}

/* ── Keypad grid ─────────────────────────────────────────────────────────── */

.tenkey__keypad {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.4rem;
}

.tenkey__key {
  height: 48px;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.12s, transform 0.08s, box-shadow 0.12s;
  user-select: none;
  -webkit-user-select: none;
}

.tenkey__key:active {
  transform: scale(0.94);
}

/* Number keys */
.tenkey__key--num {
  background: #f1f5f9;
  color: #0f172a;
  box-shadow: 0 2px 0 #cbd5e1;
}

.tenkey__key--num:hover {
  background: #e2e8f0;
}

/* Function keys (CE, C, BS, ±) */
.tenkey__key--fn {
  background: #e2e8f0;
  color: #374151;
  font-size: 0.88rem;
  box-shadow: 0 2px 0 #94a3b8;
}

.tenkey__key--fn:hover {
  background: #cbd5e1;
}

/* Operator keys (+, −, ×, ÷) */
.tenkey__key--op {
  background: #ede9fe;
  color: #7c3aed;
  box-shadow: 0 2px 0 #c4b5fd;
  font-size: 1.15rem;
}

.tenkey__key--op:hover {
  background: #ddd6fe;
}

.tenkey__key--op.tenkey__key--active {
  background: #7c3aed;
  color: #fff;
  box-shadow: 0 2px 0 #5b21b6;
}

/* Plus spans 2 rows */
.tenkey__key--plus {
  grid-row: span 2;
  height: 100%;
}

/* Memory keys */
.tenkey__key--mem {
  background: #fef3c7;
  color: #92400e;
  font-size: 0.82rem;
  box-shadow: 0 2px 0 #fcd34d;
}

.tenkey__key--mem:hover {
  background: #fde68a;
}

/* Subtotal / Total keys */
.tenkey__key--total {
  background: #dcfce7;
  color: #15803d;
  box-shadow: 0 2px 0 #86efac;
}

.tenkey__key--total:hover {
  background: #bbf7d0;
}

.tenkey__key--grand {
  background: #7c3aed;
  color: #fff;
  box-shadow: 0 2px 0 #5b21b6;
  font-size: 1.1rem;
}

.tenkey__key--grand:hover {
  background: #6d28d9;
}

/* ── Keyboard shortcuts panel ────────────────────────────────────────────── */

.tenkey__tips {
  margin-top: 1.75rem;
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: 12px;
  padding: 1.1rem 1.4rem;
}

.tenkey__tips-title {
  font-size: 0.88rem;
  font-weight: 800;
  color: #374151;
  margin: 0 0 0.85rem;
}

.tenkey__tips-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.65rem;
}

@media (max-width: 600px) {
  .tenkey__tips-grid { grid-template-columns: repeat(2, 1fr); }
}

.tenkey__tip {
  display: flex;
  flex-direction: column;
  gap: 0.18rem;
  font-size: 0.8rem;
  color: #475569;
}

.tenkey__tip strong {
  font-family: 'Courier New', Courier, monospace;
  background: #e2e8f0;
  color: #0f172a;
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
  font-size: 0.78rem;
  display: inline-block;
}

/* ── Print styles ────────────────────────────────────────────────────────── */

@media print {
  .tenkey__pad-col,
  .tenkey__tips,
  .tenkey__tape-actions,
  .tenkey__info-box,
  .tenkey__dec-row,
  .tenkey__header { display: none !important; }

  .tenkey__layout { grid-template-columns: 1fr; }
  .tenkey__tape-scroll { max-height: none; overflow: visible; }
  .tenkey-wrap { box-shadow: none; border: none; padding: 0; }
}