.content {
  max-width: 900px;
  margin: 0 auto;
  padding: 2.5rem 2rem;
  min-height: calc(100vh - 200px);
}

.container {
  background: var(--card-bg);
  padding: 2.5rem;
  border-radius: 12px;
  border: 2px solid var(--border-color);
  transition: all 0.3s ease;
}

h1 {
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
}

.subtitle {
  color: var(--text-secondary);
  margin-bottom: 2rem;
  font-size: 1.05rem;
}

/* Symbols Section */
.symbols-section {
  margin-bottom: 1.75rem;
  padding: 1.25rem;
  background: var(--bg-tertiary);
  border-radius: 10px;
  border: 2px solid var(--border-color);
  transition: all 0.3s ease;
}

.symbols-label {
  display: block;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 1rem;
  font-size: 0.95rem;
}

.symbols-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(50px, 1fr));
  gap: 0.625rem;
}

.symbol-btn {
  width: 100%;
  padding: 0.625rem;
  background: var(--card-bg);
  border: 2px solid var(--border-color);
  border-radius: 6px;
  font-size: 1.25rem;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
  color: var(--text-primary);
}

.symbol-btn:hover {
  background: var(--accent-color);
  color: #fff;
  border-color: var(--accent-color);
  transform: translateY(-2px);
}

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

textarea {
  width: 100%;
  padding: 1.125rem;
  border: 2px solid var(--border-color);
  border-radius: 8px;
  font-size: 1.05rem;
  resize: vertical;
  min-height: 170px;
  font-family: inherit;
  transition: all 0.3s;
  background: var(--bg-secondary);
  color: var(--text-primary);
  line-height: 1.6;
}

textarea:focus {
  outline: none;
  border-color: var(--accent-color);
  background: var(--bg-primary);
}

button[type="submit"] {
  width: 100%;
  padding: 1rem;
  background: var(--accent-color);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  margin-top: 1.25rem;
  transition: background 0.2s ease;
}

button[type="submit"]:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
}

button[type="submit"]:disabled {
  background: var(--text-tertiary);
  cursor: not-allowed;
  transform: none;
}

.result {
  margin-top: 2rem;
  padding: 2rem;
  background: transparent;
  border: none;
  border-radius: 8px;
  display: none;
  line-height: 1.8;
  color: var(--text-primary);
  font-size: 1.05rem;
  max-width: 100%;
}

.result * {
  white-space: normal;
}

.result div {
  line-height: 1.9;
  display: block;
}

.result span {
  display: inline;
}

.result span[style*="font-size:1.5em"],
.result span[style*="font-size:1.6em"] {
  display: block;
  margin: 0.5rem 0;
  width: 100%;
}

.result br {
  display: block !important;
  content: "" !important;
  height: 1em !important;
  line-height: 1em !important;
}

.result mjx-container {
  max-width: 100%;
  overflow: visible;
  display: inline-block;
}

.result mjx-container[display="true"] {
  overflow: visible;
  max-width: 100%;
}

.result span[style*="font-size:1.5em"] mjx-container {
  font-size: clamp(0.8em, 3vw, 1em);
}

.result span[style*="font-size:1.6em"] mjx-container {
  font-size: clamp(0.85em, 3.2vw, 1em);
}

@media (max-width: 768px) {
  .result span[style*="font-size:1.5em"] {
    font-size: 1.2em !important;
  }

  .result span[style*="font-size:1.6em"] {
    font-size: 1.3em !important;
  }
}

@media (max-width: 480px) {
  .result span[style*="font-size:1.5em"] {
    font-size: 1.1em !important;
  }

  .result span[style*="font-size:1.6em"] {
    font-size: 1.2em !important;
  }
}

.result strong {
  color: var(--accent-color);
  font-weight: 700;
  font-size: 1.1rem;
}

.result em {
  font-style: italic;
  color: var(--text-secondary);
}

.result.error {
  border-left: 4px solid var(--error-color);
  background: var(--error-bg);
  color: var(--error-text);
  padding: 1.5rem;
}

.result.loading {
  text-align: center;
  color: var(--info-color);
  font-weight: 500;
}

@media (max-width: 768px) {
  .content {
    padding: 1.5rem 1rem;
  }

  .container {
    padding: 2rem 1.5rem;
  }

  h1 {
    font-size: 1.875rem;
  }

  .symbols-grid {
    grid-template-columns: repeat(auto-fill, minmax(45px, 1fr));
    gap: 0.5rem;
  }

  .symbol-btn {
    padding: 0.5rem;
    font-size: 1.125rem;
  }

  .symbol-btn:hover {
    transform: none;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 1.5rem 1rem;
  }

  h1 {
    font-size: 1.625rem;
  }

  .symbols-grid {
    grid-template-columns: repeat(6, 1fr);
    gap: 0.375rem;
  }

  .symbol-btn {
    padding: 0.375rem;
    font-size: 1rem;
  }

  textarea {
    min-height: 140px;
    font-size: 1rem;
  }
}

.solve-another-btn {
  width: 100%;
  padding: 1rem;
  background: var(--accent-color);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  margin-top: 1.5rem;
  transition: all 0.3s;
}

.solve-another-btn:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
}

#resultArea {
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}