/* =======================================
   VOLUME CALCULATOR - MODERN UNIFIED
   ======================================= */

/* ===== COLOR DEFINITIONS ===== */
/* Dark mode is default, light mode overrides via :root.light-mode */

.volume-card {
  /* Dark mode colors */
  --volume-card-bg-card: var(--secondary-bg);
  --volume-card-bg-input: var(--primary-bg);
  --volume-card-bg-form: var(--secondary-bg);
  --volume-card-border: var(--border-color);
  --volume-card-text: var(--text-primary);
  --volume-card-text-secondary: var(--text-secondary);
  --volume-card-button-bg: var(--link-color);
  --volume-card-button-text: var(--text-primary);
  --volume-card-button-border: var(--border-color);
  --volume-card-button-hover-border: var(--link-color);
  --volume-card-button-hover-shadow: rgba(88, 166, 255, 0.2);
  --volume-card-accent-blue: #3b82f6;
  --volume-card-overlay-dark: rgba(255, 255, 255, 0.05);
  --volume-card-overlay-medium: rgba(255, 255, 255, 0.08);
  --volume-card-overlay-light: rgba(255, 255, 255, 0.03);
  --volume-card-border-dark: rgba(45, 55, 72, 0.5);
  --volume-card-focus-border: var(--link-color);
  --volume-card-focus-shadow: rgba(88, 166, 255, 0.1);
}

/* Light mode color overrides */
:root.light-mode .volume-card {
  --volume-card-bg-card: #ffffff;
  --volume-card-bg-input: #ffffff;
  --volume-card-bg-form: #f9fafb;
  --volume-card-border: #d0d7de;
  --volume-card-text: #24292f;
  --volume-card-text-secondary: #57606a;
  --volume-card-button-bg: #ffffff;
  --volume-card-button-text: #24292f;
  --volume-card-button-border: #d0d7de;
  --volume-card-button-hover-border: #0969da;
  --volume-card-button-hover-shadow: rgba(9, 105, 218, 0.15);
  --volume-card-accent-blue: #3b82f6;
  --volume-card-overlay-dark: #f9fafb;
  --volume-card-overlay-medium: #f3f4f6;
  --volume-card-overlay-light: #ffffff;
  --volume-card-border-dark: #d0d7de;
  --volume-card-focus-border: #0969da;
  --volume-card-focus-shadow: rgba(9, 105, 218, 0.1);
}

/* ===== MAIN CARD ===== */
.volume-card {
  max-width: 100%;
  margin: 0 auto;
  padding: 1.25rem;
  background: var(--volume-card-bg-card);
  border: 1px solid var(--volume-card-border);
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
  color: var(--volume-card-text);
  position: relative;
  overflow: hidden;
  box-sizing: border-box;
}

/* Gradient top border */
.volume-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--volume-card-accent-blue), #2563eb, var(--volume-card-accent-blue));
  background-size: 200% 100%;
  animation: volumeGradientShift 3s ease infinite;
}

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

/* ===== HEADER ===== */
.volume-card-title {
  color: var(--volume-card-text);
  font-size: 1.6rem;
  margin-bottom: 1rem;
  text-align: center;
  font-weight: 600;
  letter-spacing: -0.5px;
}

.volume-card-subtitle {
  text-align: center;
  color: var(--volume-card-text-secondary);
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
  line-height: 1.6;
  font-weight: 400;
}

/* ===== FEEDBACK ===== */
.volume-card-feedback {
  background: linear-gradient(135deg, #10b981 0%, #059669 100%);
  color: white;
  padding: 0.75rem 1rem;
  border-radius: 8px;
  text-align: center;
  margin-bottom: 1.25rem;
  font-weight: 600;
  font-size: 0.875rem;
  opacity: 0;
  transition: all 0.3s ease;
  visibility: hidden;
  box-shadow: 0 2px 8px rgba(16, 185, 129, 0.3);
}

.volume-card-feedback.visible {
  opacity: 1;
  visibility: visible;
}

.volume-card-feedback.error {
  background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
  box-shadow: 0 2px 8px rgba(239, 68, 68, 0.3);
}

/* ===== MAIN LAYOUT ===== */
.volume-card-main-layout {
  display: grid;
  grid-template-columns: 450px 1fr;
  gap: 1.5rem;
}

.volume-card-left {
  display: flex;
  flex-direction: column;
}

.volume-card-right {
  display: flex;
  flex-direction: column;
}

/* ===== SHAPE SELECTOR ===== */
.volume-card-shape-section {
  background: var(--volume-card-bg-form);
  padding: 1rem;
  border-radius: 12px;
  border: 1px solid var(--volume-card-border);
  margin-bottom: 1rem;
  transition: all 0.3s ease;
}

.volume-card-shape-section:hover {
  border-color: var(--volume-card-button-hover-border);
}

.shape-title {
  color: var(--volume-card-text);
  font-size: 1rem;
  margin: 0 0 0.75rem 0;
  font-weight: 700;
  text-align: center;
}

.shape-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
}

.shape-btn {
  background: var(--volume-card-button-bg);
  border: 2px solid var(--volume-card-button-border);
  border-radius: 8px;
  padding: 0.625rem;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.375rem;
}

.shape-btn:hover {
  border-color: var(--volume-card-button-hover-border);
  background: var(--volume-card-bg-card);
  transform: translateY(-2px);
}

.shape-btn.active {
  border-color: var(--volume-card-accent-blue);
  background: linear-gradient(135deg, var(--volume-card-accent-blue) 0%, #2563eb 100%);
  color: white;
  box-shadow: 0 2px 8px rgba(59, 130, 246, 0.3);
}

.shape-icon {
  font-size: 1.5rem;
}

.shape-name {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--volume-card-text);
}

.shape-btn.active .shape-name {
  color: white;
}

/* ===== INPUT SECTIONS ===== */
.volume-card-input-section {
  background: var(--volume-card-bg-form);
  padding: 1rem;
  border-radius: 12px;
  border: 1px solid var(--volume-card-border);
  margin-bottom: 1rem;
  display: none;
  transition: all 0.3s ease;
}

.volume-card-input-section:hover {
  border-color: var(--volume-card-button-hover-border);
}

.volume-card-input-section.active {
  display: block;
}

.volume-card-input-group {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  margin-bottom: 0.75rem;
}

.volume-card-input-group label {
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--volume-card-text);
}

.volume-card-input-group input {
  padding: 0.625rem 0.875rem;
  background: var(--volume-card-bg-input);
  color: var(--volume-card-text);
  border: 2px solid var(--volume-card-border);
  border-radius: 8px;
  font-family: 'Courier New', monospace;
  outline: none;
  font-size: 0.95rem;
  transition: all 0.2s ease;
}

.volume-card-input-group input::placeholder {
  color: var(--volume-card-text-secondary);
  opacity: 0.6;
}

.volume-card-input-group input:focus {
  border-color: var(--volume-card-focus-border);
  box-shadow: 0 0 0 3px var(--volume-card-focus-shadow);
}

.formula-display {
  background: var(--volume-card-bg-input);
  padding: 0.625rem 0.875rem;
  border-radius: 8px;
  border: 1px solid var(--volume-card-border);
  text-align: center;
  font-size: 0.85rem;
  color: var(--volume-card-text-secondary);
  margin-top: 0.5rem;
}

.formula-display strong {
  color: var(--volume-card-accent-blue);
}

/* ===== UNIT CONVERTER ===== */
.volume-card-converter-section {
  background: var(--volume-card-bg-form);
  padding: 0.75rem;
  border-radius: 12px;
  border: 1px solid var(--volume-card-border);
  margin-bottom: 1rem;
  transition: all 0.3s ease;
}

.volume-card-converter-section:hover {
  border-color: var(--volume-card-button-hover-border);
}

.converter-title {
  color: var(--volume-card-text);
  font-size: 0.85rem;
  margin: 0 0 0.625rem 0;
  font-weight: 600;
  text-align: center;
}

.converter-buttons {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.375rem;
}

.converter-btn {
  background: var(--volume-card-button-bg);
  border: 2px solid var(--volume-card-accent-blue);
  color: var(--volume-card-accent-blue);
  padding: 0.5rem 0.625rem;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  font-size: 0.75rem;
  transition: all 0.2s ease;
}

.converter-btn:hover {
  background: var(--volume-card-accent-blue);
  color: white;
  transform: translateY(-1px);
}

/* ===== ACTION BUTTONS ===== */
.volume-card-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.volume-card-btn {
  padding: 0.875rem 1rem;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.9rem;
  border: none;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.volume-card-btn-primary {
  background: linear-gradient(135deg, var(--volume-card-accent-blue) 0%, #2563eb 100%);
  color: white;
  box-shadow: 0 2px 8px rgba(59, 130, 246, 0.3);
  border: 2px solid var(--volume-card-accent-blue);
}

.volume-card-btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
  opacity: 0.9;
}

.volume-card-btn-secondary {
  background: var(--volume-card-button-bg);
  color: var(--volume-card-button-text);
  border: 2px solid var(--volume-card-button-border);
}

.volume-card-btn-secondary:hover {
  background: var(--volume-card-bg-card);
  border-color: var(--volume-card-button-hover-border);
  transform: translateY(-2px);
}

/* ===== VISUAL SECTION ===== */
.volume-card-visual-section {
  background: var(--volume-card-bg-form);
  padding: 1.25rem;
  border-radius: 12px;
  border: 1px solid var(--volume-card-border);
  margin-bottom: 1.25rem;
  transition: all 0.3s ease;
}

.volume-card-visual-section:hover {
  border-color: var(--volume-card-button-hover-border);
}

.visual-title {
  color: var(--volume-card-text);
  font-size: 1rem;
  margin: 0 0 1.25rem 0;
  font-weight: 700;
  text-align: center;
}

.shape-visual-container {
  background: var(--volume-card-bg-input);
  border-radius: 12px;
  border: 1px solid var(--volume-card-border);
  padding: 1.875rem;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 400px;
  position: relative;
}

.shape-visual-container svg {
  max-width: 100%;
  height: auto;
  filter: drop-shadow(0 2px 8px rgba(59, 130, 246, 0.2));
}

.dimension-label {
  fill: var(--volume-card-accent-blue);
  font-size: 14px;
  font-weight: 700;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

.dimension-line {
  stroke: var(--volume-card-accent-blue);
  stroke-width: 2;
  stroke-dasharray: 5, 5;
}

.shape-fill {
  fill: var(--volume-card-accent-blue);
  fill-opacity: 0.15;
  stroke: var(--volume-card-accent-blue);
  stroke-width: 2.5;
}

.shape-fill-secondary {
  fill: var(--volume-card-accent-blue);
  fill-opacity: 0.1;
  stroke: var(--volume-card-accent-blue);
  stroke-width: 2;
}

/* ===== RESULTS SECTION ===== */
.volume-card-results-section {
  background: var(--volume-card-bg-form);
  padding: 1rem;
  border-radius: 12px;
  border: 1px solid var(--volume-card-border);
  transition: all 0.3s ease;
}

.volume-card-results-section:hover {
  border-color: var(--volume-card-button-hover-border);
}

.volume-card-results-section.hidden {
  display: none;
}

.volume-card-results-title {
  color: var(--volume-card-accent-blue);
  text-align: center;
  margin: 0 0 0.9375rem 0;
  font-size: 1.1rem;
  font-weight: 700;
}

.volume-card-result-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.625rem;
}

.volume-card-result-item {
  background: var(--volume-card-bg-input);
  padding: 0.75rem;
  border-radius: 8px;
  border: 2px solid var(--volume-card-border);
  text-align: center;
  transition: all 0.2s ease;
}

.volume-card-result-item:hover {
  border-color: var(--volume-card-button-hover-border);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--volume-card-button-hover-shadow);
}

.volume-card-result-item.primary-result {
  border-color: var(--volume-card-accent-blue);
}

.volume-card-result-label {
  display: block;
  font-size: 0.75rem;
  color: var(--volume-card-text-secondary);
  margin-bottom: 0.25rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-weight: 500;
}

.volume-card-result-value {
  font-family: 'Courier New', monospace;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--volume-card-text);
}

.primary-result .volume-card-result-value {
  font-size: 1.8rem;
  color: var(--volume-card-accent-blue);
}

.volume-card-result-value.liter {
  color: var(--volume-card-accent-blue);
}

.volume-card-result-value.surface {
  color: #10b981;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .volume-card-main-layout {
    grid-template-columns: 1fr;
  }
  
  .volume-card {
    padding: 1rem;
  }

  .shape-visual-container {
    min-height: 300px;
  }
}

@media (max-width: 768px) {
  .volume-card {
    padding: 1rem;
    border-radius: 12px;
  }

  .volume-card-title {
    font-size: 1.5rem;
  }

  .volume-card-subtitle {
    font-size: 0.88rem;
  }

  .shape-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .volume-card-result-grid {
    grid-template-columns: 1fr;
  }
  
  .converter-buttons {
    grid-template-columns: repeat(2, 1fr);
  }

  .volume-card-actions {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 576px) {
  .volume-card {
    padding: 1rem;
  }

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

  .volume-card-subtitle {
    font-size: 0.85rem;
  }

  .shape-visual-container {
    min-height: 250px;
    padding: 1.25rem;
  }

  .primary-result .volume-card-result-value {
    font-size: 1.5rem;
  }

  .volume-card-result-value {
    font-size: 1.1rem;
  }
}