/* ======================================= */
/* VOLUME CONVERTER - Modern Styled        */
/* ======================================= */

.volume-converter-card {
  max-width: 1200px;
  margin: 0 auto;
  padding: 35px;
  background: linear-gradient(145deg, var(--card-bg) 0%, var(--secondary-bg) 100%);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  box-shadow: 
    0 20px 60px rgba(0, 0, 0, 0.5),
    0 0 0 1px rgba(255, 255, 255, 0.05) inset;
  color: var(--text-color);
  position: relative;
  overflow: hidden;
  box-sizing: border-box;
}

.volume-converter-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-purple), var(--accent-blue), var(--accent-purple));
  background-size: 200% 100%;
  animation: volume-converter-gradient-shift 3s ease infinite;
}

@keyframes volume-converter-gradient-shift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

.volume-converter-card h1 {
  color: var(--text-primary);
  font-size: 2rem;
  margin-bottom: 8px;
  text-align: center;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.volume-converter-card-subtitle {
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 30px;
  font-weight: 400;
  line-height: 1.6;
}

.volume-converter-card-layout {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 35px;
  margin-bottom: 25px;
  align-items: start;
}

.volume-converter-card-column {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* Labels */
.volume-converter-card label {
  display: block;
  margin-bottom: 10px;
  color: var(--text-primary);
  font-weight: 600;
  font-size: 0.95rem;
}

/* Input Groups */
.volume-converter-card-input-group {
  margin-bottom: 5px;
}

.volume-converter-card-input-wrapper {
  display: flex;
  align-items: center;
  background: var(--overlay-dark);
  border: 2px solid var(--border-dark);
  border-radius: 12px;
  overflow: hidden;
  height: 56px;
  transition: all 0.3s ease;
  backdrop-filter: blur(10px);
}

.volume-converter-card-input-wrapper:focus-within {
  border-color: var(--accent-purple);
  box-shadow: 0 0 20px rgba(147, 51, 234, 0.2);
}

.volume-converter-card-input-wrapper input[type="number"] {
  flex-grow: 1;
  border: none;
  background: transparent;
  text-align: center;
  font-size: 1.1rem;
  padding: 0 15px;
  height: 100%;
  color: var(--text-primary);
  font-weight: 600;
}

.volume-converter-card-input-wrapper input[type="number"]:focus {
  outline: none;
}

.volume-converter-card-input-wrapper input[type="number"]::-webkit-inner-spin-button,
.volume-converter-card-input-wrapper input[type="number"]::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.volume-converter-card-input-wrapper input[type="number"] {
  -moz-appearance: textfield;
}

.volume-converter-card-unit-label {
  padding-right: 15px;
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  white-space: nowrap;
}

.volume-converter-card-arrow-controls {
  display: flex;
  flex-direction: column;
  height: 100%;
  border-left: 1px solid var(--border-dark);
}

.volume-converter-card-arrow-btn {
  flex: 1;
  width: 50px;
  background: var(--overlay-medium);
  color: var(--text-primary);
  border: none;
  cursor: pointer;
  font-size: 1.4rem;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
  position: relative;
}

.volume-converter-card-arrow-btn.up {
  border-bottom: 1px solid var(--border-dark);
}

.volume-converter-card-arrow-btn:hover {
  background: var(--accent-purple);
  color: white;
}

.volume-converter-card-arrow-btn:active {
  transform: scale(0.95);
}

/* Select Group */
.volume-converter-card-select-group {
  display: flex;
  align-items: center;
  gap: 15px;
  background: var(--overlay-medium);
  padding: 20px;
  border-radius: 12px;
  border: 1px solid rgba(45, 55, 72, 0.5);
}

.volume-converter-card-select-group select {
  flex: 1;
  padding: 14px 16px;
  background: var(--overlay-dark);
  color: var(--text-primary);
  border: 2px solid var(--border-dark);
  border-radius: 10px;
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2394a3b8' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 40px;
}

.volume-converter-card-select-group select:hover {
  border-color: var(--accent-purple);
  transform: translateY(-1px);
}

.volume-converter-card-select-group select:focus {
  outline: none;
  border-color: var(--accent-purple);
  box-shadow: 0 0 20px rgba(147, 51, 234, 0.2);
}

.volume-converter-card-arrow-icon {
  color: var(--accent-blue);
  font-size: 1.8rem;
  font-weight: 700;
  flex-shrink: 0;
  animation: volume-converter-pulse 2s ease-in-out infinite;
}

@keyframes volume-converter-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

.unit-converter-card-input-wrapper {
  display: flex;
  align-items: center;
  background: var(--overlay-dark);
  border: 2px solid var(--border-dark);
  border-radius: 12px;
  overflow: hidden;
  height: 56px;
  transition: all 0.3s ease;
  backdrop-filter: blur(10px);
}

.unit-converter-card-input-wrapper:focus-within {
  border-color: var(--accent-purple);
  box-shadow: 0 0 20px rgba(147, 51, 234, 0.2);
}

.unit-converter-card-input-wrapper input[type="number"] {
  flex-grow: 1;
  border: none;
  background: transparent;
  text-align: center;
  font-size: 1.1rem;
  padding: 0 15px;
  height: 100%;
  color: var(--text-primary);
  font-weight: 600;
}

.unit-converter-card-input-wrapper input[type="number"]:focus {
  outline: none;
}

.unit-converter-card-arrow-controls {
  display: flex;
  flex-direction: column;
  height: 100%;
  border-left: 1px solid var(--border-dark);
}

.unit-converter-card-arrow-btn {
  flex: 1;
  width: 50px;
  background: var(--overlay-medium);
  color: var(--text-primary);
  border: none;
  cursor: pointer;
  font-size: 1.4rem;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
}

.unit-converter-card-arrow-btn.up {
  border-bottom: 1px solid var(--border-dark);
}

.unit-converter-card-arrow-btn:hover {
  background: var(--accent-purple);
  color: white;
}

.unit-converter-card-arrow-btn:active {
  transform: scale(0.95);
}

/* Output Display */
.volume-converter-card-output-section {
  margin-top: 5px;
}

.volume-converter-card-output-box {
  background: linear-gradient(135deg, #3719be 0%, #2d14a0 100%);
  border: 2px solid var(--accent-purple);
  border-radius: 12px;
  padding: 20px;
  min-height: 70px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: "Courier New", "Roboto Mono", monospace;
  font-size: 1.15rem;
  font-weight: 700;
  color: white;
  box-shadow: 0 4px 20px rgba(55, 25, 190, 0.4);
  transition: all 0.3s ease;
}

.volume-converter-card-output-box:hover {
  box-shadow: 0 6px 30px rgba(55, 25, 190, 0.6);
  transform: translateY(-2px);
}

/* Glass Visualization */
.volume-converter-card-glass-section {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 30px;
}

.volume-converter-card-glass-container {
  position: relative;
}

.volume-converter-card-glass {
  position: relative;
  width: 140px;
  height: 280px;
  border: 3px solid var(--border-color);
  border-radius: 15px 15px 8px 8px;
  background: linear-gradient(to top, #15181f, #22252d);
  overflow: hidden;
  box-shadow: 
    0 10px 30px rgba(0, 0, 0, 0.5),
    0 0 0 1px rgba(255, 255, 255, 0.05) inset;
  transition: all 0.3s ease;
}

.volume-converter-card-glass-fill {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  background: linear-gradient(to top, #00b0ff, #80d8ff);
  height: 0%;
  transition: height 0.8s ease, background 0.3s ease;
  border-top: 2px solid rgba(255, 255, 255, 0.3);
}

.volume-converter-card-glass-glare {
  position: absolute;
  top: 0;
  left: 15%;
  width: 30%;
  height: 100%;
  background: linear-gradient(to right, rgba(255, 255, 255, 0.15), transparent);
  pointer-events: none;
}

.volume-converter-card-glass.overflow {
  animation: volume-converter-shake 0.5s ease 2;
  border-color: #ff5252;
  box-shadow: 0 0 30px rgba(255, 82, 82, 0.5);
}

.volume-converter-card-glass.overflow .volume-converter-card-glass-fill {
  background: linear-gradient(to top, #ff6b6b, #ff9999);
  animation: volume-converter-overflow 1s ease-in-out infinite alternate;
}

@keyframes volume-converter-shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-8px); }
  75% { transform: translateX(8px); }
}

@keyframes volume-converter-overflow {
  0% { opacity: 0.7; }
  100% { opacity: 1; }
}

/* Info Stats */
.volume-converter-card-stats {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.volume-converter-card-stat {
  background: var(--overlay-dark);
  padding: 14px 18px;
  border-radius: 10px;
  border: 1px solid var(--border-dark);
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all 0.2s ease;
}

.volume-converter-card-stat:hover {
  border-color: var(--accent-purple);
  transform: translateX(4px);
}

.volume-converter-card-stat-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.volume-converter-card-stat-value {
  font-size: 1.1rem;
  color: var(--accent-blue);
  font-weight: 700;
  font-family: "Courier New", monospace;
}

/* Capacity Controls */
.volume-converter-card-capacity-section {
  background: var(--overlay-medium);
  padding: 20px;
  border-radius: 12px;
  border: 1px solid rgba(45, 55, 72, 0.5);
}

/* Warning */
.volume-converter-card-warning {
  color: #ff5252;
  font-size: 0.95rem;
  font-weight: 600;
  opacity: 0;
  transition: all 0.3s ease;
  transform: translateY(10px);
  margin-top: 25px;
  text-align: center;
  padding: 15px;
  background: rgba(255, 82, 82, 0.1);
  border: 2px solid rgba(255, 82, 82, 0.3);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}

.volume-converter-card-warning.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Responsive - Tablet */
@media (max-width: 768px) {
  .volume-converter-card {
    padding: 25px 20px;
  }

  .volume-converter-card h1 {
    font-size: 1.6rem;
  }

  .volume-converter-card-subtitle {
    font-size: 0.85rem;
    margin-bottom: 25px;
  }

  .volume-converter-card-layout {
    grid-template-columns: 1fr;
    gap: 25px;
  }

  .volume-converter-card-glass {
    width: 120px;
    height: 240px;
  }

  .volume-converter-card-glass-section {
    padding: 20px 0;
  }
}

/* Responsive - Mobile */
@media (max-width: 480px) {
  .volume-converter-card {
    padding: 20px 15px;
    border-radius: 16px;
  }

  .volume-converter-card h1 {
    font-size: 1.4rem;
  }

  .volume-converter-card-subtitle {
    font-size: 0.8rem;
  }

  .volume-converter-card-input-wrapper {
    height: 50px;
  }

  .volume-converter-card-arrow-btn {
    width: 45px;
    font-size: 1.2rem;
  }

  .volume-converter-card-select-group {
    flex-direction: column;
    gap: 12px;
    padding: 16px;
  }

  .volume-converter-card-select-group select {
    width: 100%;
  }

  .volume-converter-card-arrow-icon {
    transform: rotate(90deg);
    font-size: 1.5rem;
  }

  .volume-converter-card-glass {
    width: 100px;
    height: 200px;
  }

  .volume-converter-card-output-box {
    padding: 16px;
    font-size: 1rem;
  }

  .volume-converter-card-stat {
    padding: 12px 14px;
  }

  .volume-converter-card-stat-label {
    font-size: 0.8rem;
  }

  .volume-converter-card-stat-value {
    font-size: 1rem;
  }

  .volume-converter-card-warning {
    font-size: 0.85rem;
    padding: 12px;
  }
}

/* Extra small screens */
@media (max-width: 375px) {
  .volume-converter-card {
    padding: 16px 12px;
  }

  .volume-converter-card h1 {
    font-size: 1.3rem;
  }

  .volume-converter-card-subtitle {
    font-size: 0.75rem;
  }
}