/* ==========================================================================
   Neon Pulse Calculator - Component Styles (v3.0)
   ========================================================================== */

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-lg);
  font-family: var(--font-family-primary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  line-height: 1;
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.btn:active { transform: scale(0.97); }

/* Primary Button */
.btn-primary {
  background: var(--gradient-button);
  background-size: 200% 200%;
  color: var(--color-text-primary);
  box-shadow: var(--shadow-neon-cyan);
  animation: gradientShift 4s ease infinite;
}

@keyframes gradientShift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 0 25px rgba(0, 245, 255, 0.4), 0 0 50px rgba(178, 75, 255, 0.2);
}

/* Secondary Button */
.btn-secondary {
  background: var(--color-glass-white);
  border: 1px solid var(--color-glass-border);
  color: var(--color-text-primary);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: var(--color-glass-hover);
  border-color: var(--color-neon-cyan);
  box-shadow: var(--shadow-neon-cyan);
}

/* Clear Button */
.btn-clear {
  background: rgba(255, 71, 87, 0.12);
  border: 1px solid rgba(255, 71, 87, 0.25);
  color: var(--color-error);
}

.btn-clear:hover {
  background: rgba(255, 71, 87, 0.2);
  border-color: var(--color-error);
  box-shadow: 0 0 15px rgba(255, 71, 87, 0.25);
}

/* ===== Calculator Buttons ===== */
.calc-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-sm);
  font-family: var(--font-family-mono);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  background: var(--color-glass-white);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  aspect-ratio: 1;
  position: relative;
  overflow: hidden;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.calc-btn:hover {
  background: var(--color-glass-hover);
  border-color: rgba(0, 245, 255, 0.2);
  transform: translateY(-1px);
}

.calc-btn:active {
  transform: translateY(0) scale(0.95);
}

/* Number Buttons */
.calc-btn-number { background: rgba(255, 255, 255, 0.06); }
.calc-btn-number:hover { background: rgba(255, 255, 255, 0.1); }

/* Operator Buttons */
.calc-btn-operator {
  background: rgba(178, 75, 255, 0.15);
  border-color: rgba(178, 75, 255, 0.2);
  color: var(--color-neon-purple);
}
.calc-btn-operator:hover {
  background: rgba(178, 75, 255, 0.25);
  border-color: var(--color-neon-purple);
  box-shadow: var(--shadow-neon-purple);
}

/* Function Buttons */
.calc-btn-function {
  background: rgba(255, 60, 142, 0.12);
  border-color: rgba(255, 60, 142, 0.2);
  color: var(--color-neon-pink);
}
.calc-btn-function:hover {
  background: rgba(255, 60, 142, 0.2);
  border-color: var(--color-neon-pink);
  box-shadow: var(--shadow-neon-pink);
}

/* Equals Button */
.calc-btn-equals {
  aspect-ratio: auto;
  background: var(--gradient-primary);
  border: none;
  color: var(--color-bg-primary);
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-base);
  box-shadow: var(--shadow-neon-cyan);
}
.calc-btn-equals:hover {
  box-shadow: 0 0 25px rgba(0, 245, 255, 0.4), 0 0 45px rgba(178, 75, 255, 0.25);
  transform: translateY(-1px);
}

/* ===== Inputs ===== */
.input {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  font-family: var(--font-family-mono);
  font-size: var(--font-size-base);
  color: var(--color-text-primary);
  background: rgba(0, 0, 0, 0.35);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-md);
  outline: none;
  transition: all var(--transition-base);
}

.input::placeholder { color: var(--color-text-muted); }
.input:hover { border-color: rgba(0, 245, 255, 0.2); }
.input:focus {
  border-color: var(--color-neon-cyan);
  box-shadow: 0 0 0 2px rgba(0, 245, 255, 0.08), var(--shadow-neon-cyan);
}

/* Calculator Display - Auto-scaling */
.calc-display {
  padding: var(--space-md) var(--space-lg);
  font-size: var(--font-size-3xl);
  text-align: left;
  direction: ltr;
  background: rgba(0, 0, 0, 0.45);
  border: 1px solid rgba(0, 245, 255, 0.1);
  color: var(--color-neon-cyan);
  text-shadow: 0 0 10px rgba(0, 245, 255, 0.4);
  min-height: 70px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  transition: font-size 0.15s ease, color 0.2s ease;
}

/* Dynamic font sizing classes for display */
.calc-display.font-xl { font-size: var(--font-size-3xl); }
.calc-display.font-lg { font-size: var(--font-size-2xl); }
.calc-display.font-md { font-size: var(--font-size-xl); }
.calc-display.font-sm { font-size: var(--font-size-lg); }
.calc-display.font-xs { font-size: var(--font-size-base); }
.calc-display.font-xxs { font-size: var(--font-size-sm); }

/* Error state */
.calc-display.error-state {
  color: var(--color-error);
  text-shadow: 0 0 10px rgba(255, 71, 87, 0.4);
}

/* Input with Label */
.input-group {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.input-label {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
}

/* ===== Select ===== */
.select {
  appearance: none;
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  padding-left: 36px;
  font-family: var(--font-family-primary);
  font-size: var(--font-size-sm);
  color: var(--color-text-primary);
  background: rgba(0, 0, 0, 0.35);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-md);
  outline: none;
  cursor: pointer;
  transition: all var(--transition-base);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' viewBox='0 0 24 24' fill='none' stroke='%2300f5ff' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: left 10px center;
  background-size: 18px;
}

.select:hover { border-color: rgba(0, 245, 255, 0.2); }
.select:focus {
  border-color: var(--color-neon-cyan);
  box-shadow: 0 0 0 2px rgba(0, 245, 255, 0.08), var(--shadow-neon-cyan);
}
.select option { background: var(--color-bg-secondary); color: var(--color-text-primary); }

/* ===== Toggle Button ===== */
.toggle-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-md);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  background: var(--color-glass-white);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
}

.toggle-btn:hover { color: var(--color-text-primary); background: var(--color-glass-hover); }
.toggle-btn.active {
  color: var(--color-neon-purple);
  border-color: var(--color-neon-purple);
  background: rgba(178, 75, 255, 0.1);
}

/* ===== Unit Converter Styles ===== */
.converter-categories {
  display: flex;
  gap: var(--space-xs);
  justify-content: center;
  margin-bottom: var(--space-lg);
  flex-wrap: wrap;
}

.converter-category-btn {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-md);
  font-family: var(--font-family-primary);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  background: var(--color-glass-white);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-base);
}

.converter-category-btn:hover {
  color: var(--color-text-primary);
  border-color: var(--color-neon-cyan);
}

.converter-category-btn.active {
  color: var(--color-bg-primary);
  background: var(--gradient-primary);
  border-color: transparent;
  box-shadow: var(--shadow-neon-cyan);
}

.converter-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.converter-selects {
  display: flex;
  align-items: flex-end;
  gap: var(--space-sm);
}

.converter-selects .input-group { flex: 1; }

.btn-swap {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  font-size: var(--font-size-lg);
  color: var(--color-neon-purple);
  background: rgba(178, 75, 255, 0.12);
  border: 1px solid rgba(178, 75, 255, 0.25);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
  flex-shrink: 0;
}

.btn-swap:hover {
  background: rgba(178, 75, 255, 0.2);
  border-color: var(--color-neon-purple);
  transform: rotate(180deg);
}

.converter-result { text-align: center; }

.result-formula {
  margin-top: var(--space-xs);
  font-family: var(--font-family-mono);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  direction: ltr;
}

/* ===== PC Mode Toggle ===== */
.pc-mode-toggle {
  position: fixed;
  top: var(--space-md);
  left: var(--space-md);
  z-index: var(--z-sticky);
  display: none; /* Only show on desktop */
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-md);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(12px);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-base);
}

.pc-mode-toggle:hover {
  color: var(--color-neon-cyan);
  border-color: rgba(0, 245, 255, 0.3);
  background: rgba(0, 0, 0, 0.7);
}

.pc-mode-toggle.active {
  color: var(--color-neon-cyan);
  border-color: var(--color-neon-cyan);
  background: rgba(0, 245, 255, 0.1);
}

@media (min-width: 768px) {
  .pc-mode-toggle { display: flex; }
}

/* ===== Action Buttons Row ===== */
.action-buttons {
  display: flex;
  gap: var(--space-xs);
  flex-wrap: wrap;
  justify-content: center;
}

.action-buttons .btn {
  flex: 1;
  min-width: 100px;
  max-width: 180px;
  white-space: nowrap;
}

/* ===== Scientific Mode Drawer ===== */
.sci-drawer {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-2xs);
  margin-bottom: var(--space-xs);
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, opacity 0.3s ease, margin 0.3s ease;
  opacity: 0;
}

.sci-drawer.open {
  max-height: 200px;
  opacity: 1;
  margin-bottom: var(--space-xs);
}

.sci-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-xs);
  font-family: var(--font-family-mono);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  color: var(--color-neon-orange);
  background: rgba(255, 159, 67, 0.1);
  border: 1px solid rgba(255, 159, 67, 0.2);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.sci-btn:hover {
  background: rgba(255, 159, 67, 0.2);
  border-color: var(--color-neon-orange);
  box-shadow: 0 0 10px rgba(255, 159, 67, 0.2);
}

.sci-btn:active { transform: scale(0.95); }

/* ===== Scientific Toggle ===== */
.sci-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: var(--space-2xs) var(--space-sm);
  font-size: var(--font-size-xs);
  color: var(--color-neon-orange);
  background: rgba(255, 159, 67, 0.08);
  border: 1px solid rgba(255, 159, 67, 0.15);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-base);
  margin-bottom: var(--space-xs);
}

.sci-toggle:hover {
  background: rgba(255, 159, 67, 0.15);
}

.sci-toggle.active {
  background: rgba(255, 159, 67, 0.15);
  border-color: var(--color-neon-orange);
}

.sci-toggle-icon {
  transition: transform 0.3s ease;
}

.sci-toggle.active .sci-toggle-icon {
  transform: rotate(180deg);
}