/* ── Number pad ───────────────────────────────────────────────────────── */
.numpad {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.numpad-digits {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
}

.numpad-utils {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 6px;
}

.numpad-bottom {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 6px;
}

/* ── Base button ──────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 8px;
  border: 1px solid var(--btn-border);
  border-radius: 5px;
  background: var(--btn-bg);
  color: var(--text);
  font-family: inherit;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.1s, border-color 0.1s, color 0.1s;
  line-height: 1;
  white-space: nowrap;
}

.btn:hover {
  background: var(--btn-hover);
  border-color: var(--border);
}

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

.btn:disabled {
  opacity: 0.38;
  cursor: not-allowed;
  pointer-events: none;
}

/* Terminal */
body.theme-terminal .btn {
  border-radius: 0;
  border-color: var(--border);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-size: 12px;
}

body.theme-terminal .btn:hover {
  border-color: var(--accent);
  box-shadow: 0 0 6px rgba(57,255,20,0.2);
}

/* Coffee */
body.theme-coffee .btn {
  border-radius: 6px;
  box-shadow: 0 1px 3px rgba(59,42,26,0.15);
}

/* School */
body.theme-school .btn {
  border-radius: 3px;
}

/* Mountain */
body.theme-mountain .btn {
  border-radius: 6px;
  box-shadow: 0 1px 3px rgba(26,58,82,0.1);
}

/* ── Digit buttons ────────────────────────────────────────────────────── */
.btn-digit {
  font-size: 20px;
  font-family: Georgia, "Times New Roman", serif;
  font-weight: 500;
  padding: 12px 6px;
}

body.theme-terminal .btn-digit {
  font-family: "Courier New", Courier, monospace;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: none;
}

body.theme-school .btn-digit {
  font-family: Georgia, serif;
  font-style: italic;
}

/* ── Mode toggle button ───────────────────────────────────────────────── */
.btn-mode {
  position: relative;
  overflow: hidden;
}

.btn-mode.mode-pen {
  background: var(--surface);
  border-color: var(--accent);
  color: var(--accent);
  font-weight: 600;
}

.btn-mode.mode-pencil {
  background: var(--surface);
  border-color: var(--pencil);
  color: var(--pencil);
  font-weight: 600;
}

body.theme-terminal .btn-mode.mode-pen {
  box-shadow: 0 0 8px rgba(57,255,20,0.25);
}

.btn-mode .mode-label {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1px;
}

.btn-mode .mode-main {
  font-size: 13px;
}

body.theme-terminal .btn-mode .mode-main {
  font-size: 12px;
}

.btn-mode .mode-sub {
  font-size: 10px;
  opacity: 0.7;
  font-family: inherit;
}

/* ── Hint button ──────────────────────────────────────────────────────── */
.btn-hint {
  position: relative;
}

.hint-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--accent);
  color: var(--surface);
  border-radius: 99px;
  font-size: 11px;
  font-weight: 700;
  font-family: inherit;
  min-width: 18px;
  height: 18px;
  padding: 0 4px;
  line-height: 1;
  transition: background 0.2s, color 0.2s;
}

body.theme-terminal .hint-badge {
  border-radius: 0;
  color: #000;
}

.btn:disabled .hint-badge {
  background: var(--text-muted);
}

/* ── Check button ─────────────────────────────────────────────────────── */
.btn-check {
  grid-column: span 2;
}

/* ── Action row ───────────────────────────────────────────────────────── */
.action-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

/* ── Primary button (dialog confirm) ─────────────────────────────────── */
.btn-primary {
  background: var(--accent);
  color: var(--surface);
  border-color: var(--accent);
}

body.theme-terminal .btn-primary {
  color: #000;
  font-weight: 700;
}

body.theme-school .btn-primary {
  color: #ffffff;
}

.btn-primary:hover {
  background: var(--primary-hover);
  border-color: var(--primary-hover);
}

body.theme-terminal .btn-primary:hover {
  box-shadow: 0 0 10px rgba(57,255,20,0.4);
}

/* ── Confirmation dialog / modal ──────────────────────────────────────── */
.modal-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.35);
  z-index: 100;
  align-items: center;
  justify-content: center;
}

body.theme-terminal .modal-backdrop {
  background: rgba(0,0,0,0.75);
}

.modal-backdrop.open {
  display: flex;
}

.modal {
  background: var(--modal-bg);
  border-radius: 10px;
  padding: 28px 28px 22px;
  max-width: 340px;
  width: 90%;
  box-shadow: 0 8px 40px rgba(0,0,0,0.18);
  border: 1px solid var(--border);
  transition: background 0.2s, border-color 0.2s;
}

body.theme-terminal .modal {
  border-radius: 0;
  border-color: var(--accent);
  box-shadow: 0 0 24px rgba(57,255,20,0.2);
}

body.theme-coffee .modal {
  box-shadow: 0 8px 40px rgba(59,42,26,0.4);
}

.modal h2 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text);
}

.modal p {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 22px;
  line-height: 1.5;
}

.modal-actions {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
}

/* ── Theme select (header) ────────────────────────────────────────────── */
#theme-select {
  font-size: 13px;
  padding: 4px 24px 4px 8px;
  border: 1px solid var(--btn-border);
  border-radius: 4px;
  background-color: var(--btn-bg);
  color: var(--text);
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%237a7570'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 8px center;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
  font-family: inherit;
}

body.theme-coffee #theme-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%238c6642'/%3E%3C/svg%3E");
}

body.theme-school #theme-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%23718096'/%3E%3C/svg%3E");
}

body.theme-terminal #theme-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%2339ff14'/%3E%3C/svg%3E");
  border-color: var(--accent);
}

body.theme-mountain .theme-control #theme-select {
  background-color: #2d5878;
  color: #e8f0f7;
  border-color: #4d7a99;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%23adc6de'/%3E%3C/svg%3E");
}

body.theme-coffee .theme-control #theme-select {
  background-color: #3b2a1a;
  color: #f5ede0;
  border-color: #7c4f22;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%23c9a97a'/%3E%3C/svg%3E");
}

#theme-select:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}