/* ============================================================
   TALAN.PRO — Calculator Tool Styles
   ============================================================ */

/* ── Background ── */
.orb { opacity: 0.15; }

.orb-1 {
  width: 500px; height: 500px;
  background: radial-gradient(circle, #4fc3f7, transparent 70%);
  top: -150px; left: -100px;
  animation: orb-float-1 18s ease-in-out infinite;
}

.orb-2 {
  width: 400px; height: 400px;
  background: radial-gradient(circle, #b388ff, transparent 70%);
  bottom: -100px; right: -80px;
  animation: orb-float-2 22s ease-in-out infinite;
}

/* ── Layout ── */
.calc-layout {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: var(--space-6);
  align-items: start;
  max-width: 960px;
  margin-inline: auto;
}

/* ── Calculator Card ── */
.calc-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: var(--blur-lg);
  -webkit-backdrop-filter: var(--blur-lg);
  border-radius: var(--radius-2xl);
  padding: var(--space-6);
  box-shadow: var(--glow-soft);
}

/* Mode toggle */
.mode-toggle {
  display: flex;
  gap: var(--space-2);
  margin-bottom: var(--space-5);
  background: rgba(0,0,0,0.2);
  border-radius: var(--radius-full);
  padding: 4px;
}

.mode-btn {
  flex: 1;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  border: none;
  background: none;
  color: var(--text-muted);
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  letter-spacing: var(--tracking-wide);
  transition: all var(--duration-base) var(--ease-out);
  cursor: pointer;
}

.mode-btn.active {
  background: var(--glass-bg-hover);
  color: var(--text-primary);
  box-shadow: 0 0 0 1px var(--glass-border);
}

/* Display */
.calc-display {
  background: rgba(0,0,0,0.3);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5) var(--space-6);
  margin-bottom: var(--space-5);
  text-align: right;
  min-height: 96px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}

.calc-expression {
  font-size: var(--text-sm);
  color: var(--text-muted);
  font-family: var(--font-mono);
  min-height: 20px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  margin-bottom: var(--space-2);
}

.calc-result {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: var(--weight-bold);
  font-family: var(--font-mono);
  letter-spacing: -0.03em;
  color: var(--text-primary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  transition: color var(--duration-fast);
}

.calc-result.error { color: #ff6464; font-size: var(--text-xl); }
.calc-result.fresh { animation: number-roll 0.2s var(--ease-out); }

/* Buttons */
.calc-buttons {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

/* Scientific rows — hidden in basic mode */
.sci-panel {
  display: none;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--space-2);
}
.sci-panel.visible { display: grid; }

/* Main number pad */
.main-pad {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  grid-template-rows: repeat(5, 52px);
  gap: var(--space-2);
  grid-template-areas:
    "ac   sign pct  div  bksp"
    "n7   n8   n9   mul  .   "
    "n4   n5   n6   sub  .   "
    "n1   n2   n3   add  .   "
    "n0   n0   dot  eq   eq  ";
}

.calc-btn {
  padding: var(--space-4);
  border-radius: var(--radius-md);
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  color: var(--text-primary);
  font-size: var(--text-base);
  font-weight: var(--weight-medium);
  font-family: var(--font-sans);
  cursor: pointer;
  transition:
    background var(--duration-fast),
    border-color var(--duration-fast),
    transform var(--duration-fast) var(--ease-spring),
    box-shadow var(--duration-fast);
  position: relative;
  overflow: hidden;
  min-height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.calc-btn:active {
  transform: scale(0.93);
  background: var(--glass-bg-active);
}

.calc-btn.btn-operator {
  background: var(--accent-blue-dim);
  border-color: rgba(79,195,247,0.2);
  color: var(--accent-blue);
  font-weight: var(--weight-bold);
}

.calc-btn.btn-operator:hover {
  background: rgba(79,195,247,0.2);
  box-shadow: 0 0 16px rgba(79,195,247,0.2);
}

.calc-btn.btn-equals {
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-violet));
  border-color: transparent;
  color: #fff;
  font-weight: var(--weight-bold);
  box-shadow: 0 0 20px rgba(79,195,247,0.3);
}

.calc-btn.btn-equals:hover {
  box-shadow: 0 0 30px rgba(79,195,247,0.5);
}

.calc-btn.btn-clear {
  background: rgba(255,100,100,0.1);
  border-color: rgba(255,100,100,0.2);
  color: #ff6464;
}

.calc-btn.btn-clear:hover {
  background: rgba(255,100,100,0.18);
}

.calc-btn.btn-fn {
  background: var(--accent-violet-dim);
  border-color: rgba(179,136,255,0.2);
  color: var(--accent-violet);
  font-size: var(--text-sm);
}

.calc-btn.btn-fn:hover {
  background: rgba(179,136,255,0.2);
}

/* Grid area assignments */
.btn-ac   { grid-area: ac; }
.btn-sign { grid-area: sign; }
.btn-pct  { grid-area: pct; }
.btn-div  { grid-area: div; }
.btn-bksp { grid-area: bksp; }
.btn-n7   { grid-area: n7; }
.btn-n8   { grid-area: n8; }
.btn-n9   { grid-area: n9; }
.btn-mul  { grid-area: mul; }
.btn-n4   { grid-area: n4; }
.btn-n5   { grid-area: n5; }
.btn-n6   { grid-area: n6; }
.btn-sub  { grid-area: sub; }
.btn-n1   { grid-area: n1; }
.btn-n2   { grid-area: n2; }
.btn-n3   { grid-area: n3; }
.btn-add  { grid-area: add; }
.btn-eq   { grid-area: eq; }
.btn-n0   { grid-area: n0; }
.btn-dot  { grid-area: dot; }

/* ── History ── */
.history-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: var(--blur-lg);
  -webkit-backdrop-filter: var(--blur-lg);
  border-radius: var(--radius-2xl);
  padding: var(--space-6);
  box-shadow: var(--glow-soft);
}

.history-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-5);
}

.history-title {
  font-size: var(--text-base);
  font-weight: var(--weight-semibold);
  color: var(--text-secondary);
}

.history-clear {
  font-size: var(--text-xs);
  color: var(--text-muted);
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  transition: color var(--duration-fast), background var(--duration-fast);
}

.history-clear:hover { color: #ff6464; background: rgba(255,100,100,0.08); }

.history-list { display: flex; flex-direction: column; gap: var(--space-2); }

.history-item {
  padding: var(--space-3) var(--space-4);
  background: rgba(0,0,0,0.2);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--duration-fast), border-color var(--duration-fast);
  border: 1px solid transparent;
}

.history-item:hover {
  background: var(--glass-bg-hover);
  border-color: var(--glass-border);
}

.history-expr {
  font-size: var(--text-xs);
  color: var(--text-muted);
  font-family: var(--font-mono);
  margin-bottom: 2px;
}

.history-val {
  font-size: var(--text-base);
  font-weight: var(--weight-semibold);
  font-family: var(--font-mono);
  color: var(--text-primary);
}

.history-empty {
  font-size: var(--text-sm);
  color: var(--text-muted);
  text-align: center;
  padding: var(--space-8) 0;
}

/* Keyboard hint */
.kbd-hint {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--glass-border);
}

.kbd-item {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 11px;
  color: var(--text-muted);
}

kbd {
  display: inline-block;
  padding: 1px 5px;
  border-radius: 4px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  font-size: 10px;
  font-family: var(--font-mono);
  color: var(--text-secondary);
}

@media (max-width: 768px) {
  .calc-layout { grid-template-columns: 1fr; }
}