frontend/style.css

:root {
  --primary-color: #6366f1;
  --primary-hover: #4f46e5;
  --bg-color: #f8fafc;
  --card-bg: #ffffff;
  --text-color: #1e293b;
  --border-color: #e2e8f0;
  --radius: 12px;
  --divider-color: #e2e8f0;
  --icon-color: #64748b;
  --nav-width: 240px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-color);
  color: var(--text-color);
  line-height: 1.5;
  min-height: 100vh;
}

.app-container {
  display: flex;
  min-height: 100vh;
}

h1 {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 2rem;
  background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

h2 {
  text-align: center;
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
  color: var(--text-color);
}

section {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 2rem;
  margin-bottom: 2rem;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  transition: transform 0.2s ease;
}

section:hover {
  transform: translateY(-2px);
}

textarea, input[type="text"], .category-select {
  width: 100%;
  padding: 1rem;
  margin-bottom: 1rem;
  border: 2px solid var(--border-color);
  border-radius: var(--radius);
  font-size: 1rem;
  transition: border-color 0.2s ease;
  background: var(--bg-color);
  resize: vertical;
  min-height: 100px;
}

.category-wrapper {
  margin-bottom: 1.5rem;
}

.category-select {
  min-height: auto;
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' 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: right 1rem center;
  background-size: 1em;
  padding-right: 2.5rem;
}

.category-select:focus {
  outline: none;
  border-color: var(--primary-color);
}

.category-info {
  margin-top: 0.5rem;
  padding: 1rem;
  background: var(--bg-color);
  border-radius: var(--radius);
  font-size: 0.9rem;
  color: var(--text-color);
  opacity: 0;
  transform: translateY(-10px);
  transition: all 0.3s ease;
}

.category-info.visible {
  opacity: 1;
  transform: translateY(0);
}

.category-info h4 {
  margin: 0 0 0.5rem;
  color: var(--primary-color);
}

.category-info ul {
  margin: 0.5rem 0;
  padding-left: 1.5rem;
}

.category-info li {
  margin-bottom: 0.25rem;
}

.conventions-list, .elements-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

.convention-tag, .element-tag {
  background: var(--primary-color);
  color: white;
  padding: 0.25rem 0.75rem;
  border-radius: 1rem;
  font-size: 0.8rem;
}

input[type="text"] {
  min-height: auto;
}

textarea:focus, input[type="text"]:focus {
  outline: none;
  border-color: var(--primary-color);
}

input[type="file"] {
  width: 100%;
  padding: 0.5rem;
  margin-bottom: 1rem;
  cursor: pointer;
}

button {
  width: 100%;
  padding: 1rem;
  background: var(--primary-color);
  color: white;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 1rem;
  font-weight: 600;
  transition: all 0.2s ease;
  margin-top: 1rem;
}

button:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
}

button:active {
  transform: translateY(0);
}

button.loading {
  opacity: 0.7;
  cursor: not-allowed;
  position: relative;
}

button.loading::after {
  content: "";
  position: absolute;
  width: 20px;
  height: 20px;
  top: 50%;
  left: 50%;
  margin: -10px 0 0 -10px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

.input-section {
  position: relative;
  margin: 2rem 0;
}

.divider {
  position: relative;
  text-align: center;
  margin: 1.5rem 0;
}

.divider::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--divider-color);
}

.divider span {
  position: relative;
  background: var(--card-bg);
  padding: 0 1rem;
  color: var(--icon-color);
  font-size: 0.9rem;
}

.file-input-wrapper {
  position: relative;
  width: 100%;
  min-height: 150px;
  border: 2px dashed var(--border-color);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
  cursor: pointer;
  background: var(--bg-color);
}

.file-input-wrapper:hover,
.file-input-wrapper.highlight {
  border-color: var(--primary-color);
  background: rgba(99, 102, 241, 0.05);
}

.file-input-wrapper input[type="file"] {
  position: absolute;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
}

.file-input-wrapper label {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  color: var(--icon-color);
  font-size: 0.95rem;
  text-align: center;
  padding: 2rem;
  pointer-events: none;
}

.file-input-wrapper svg {
  stroke: var(--icon-color);
  transition: stroke 0.2s ease;
}

.file-input-wrapper:hover svg {
  stroke: var(--primary-color);
}

textarea {
  min-height: 120px;
  line-height: 1.6;
}

.error-message {
  color: #dc2626;
  background: #fef2f2;
  padding: 1rem;
  border-radius: var(--radius);
  margin-bottom: 1rem;
  border: 1px solid #fecaca;
}

.result-text {
  background: var(--bg-color);
  padding: 1rem;
  border-radius: var(--radius);
  margin-bottom: 1rem;
}

.text-section {
  margin-bottom: 1.5rem;
  padding: 1rem;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
}

.text-section:last-child {
  margin-bottom: 0;
}

.section-title {
  color: var(--primary-color);
  font-size: 1.1rem;
  margin: 0 0 0.5rem 0;
  font-weight: 600;
}

.text-section p {
  margin: 0;
  line-height: 1.6;
  white-space: pre-wrap;
}

.image-wrapper {
  position: relative;
  opacity: 0;
  transform: translateY(10px);
  transition: all 0.3s ease;
}

.image-wrapper.loaded {
  opacity: 1;
  transform: translateY(0);
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

#results, #resultsImg {
  margin-top: 1.5rem;
  display: grid;
  gap: 1rem;
}

#results img, #resultsImg img {
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  transition: transform 0.2s ease;
}

#results img:hover, #resultsImg img:hover {
  transform: scale(1.02);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.side-nav {
  width: var(--nav-width);
  background: var(--card-bg);
  border-right: 1px solid var(--border-color);
  padding: 2rem 1rem;
  flex-shrink: 0;
}

.nav-header {
  padding: 0 1rem 1rem;
  border-bottom: 1px solid var(--border-color);
}

.nav-header h2 {
  font-size: 1.1rem;
  margin: 0;
  text-align: left;
  color: var(--text-color);
}

.nav-items {
  padding-top: 1rem;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  width: 100%;
  padding: 0.75rem 1rem;
  background: transparent;
  border: none;
  border-radius: var(--radius);
  color: var(--text-color);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
}

.nav-item svg {
  stroke: var(--icon-color);
  transition: stroke 0.2s ease;
}

.nav-item:hover {
  background: var(--bg-color);
  transform: translateX(4px);
}

.nav-item.active {
  background: var(--primary-color);
  color: white;
}

.nav-item.active svg {
  stroke: white;
}

.main-content {
  flex-grow: 1;
  position: relative;
  display: flex;
}

.content-area {
  flex-grow: 1;
  padding: 2rem;
  max-width: calc(100% - var(--nav-width));
  transition: max-width 0.3s ease;
}

.results-panel {
  position: fixed;
  right: 0;
  top: 0;
  bottom: 0;
  width: 400px;
  background: var(--card-bg);
  border-left: 1px solid var(--border-color);
  padding: 2rem;
  overflow-y: auto;
  transform: translateX(100%);
  transition: transform 0.3s ease;
  box-shadow: -4px 0 16px rgba(0, 0, 0, 0.1);
}

.results-panel.visible {
  transform: translateX(0);
}

.main-content.with-panel .content-area {
  max-width: calc(100% - var(--nav-width) - 400px);
}

.interface {
  display: none;
}

.interface.active {
  display: block;
}

@media (max-width: 600px) {
  body {
    padding: 1rem;
  }

  section {
    padding: 1.5rem;
  }

  h1 {
    font-size: 2rem;
  }
  
  .file-input-wrapper {
    min-height: 100px;
  }
}

@media (max-width: 1200px) {
  .results-panel {
    width: 350px;
  }
  
  .main-content.with-panel {
    max-width: calc(100% - var(--nav-width) - 350px);
  }
}

@media (max-width: 768px) {
  .app-container {
    flex-direction: column;
  }

  .side-nav {
    width: 100%;
    border-right: none;
    border-bottom: 1px solid var(--border-color);
    padding: 1rem;
  }

  .nav-items {
    display: flex;
    gap: 1rem;
  }

  .nav-item {
    flex: 1;
    justify-content: center;
  }

  .nav-item svg {
    display: none;
  }

  .main-content {
    max-width: 100%;
    padding: 1rem;
  }

  .results-panel {
    position: fixed;
    width: 100%;
    height: 50%;
    top: auto;
    bottom: 0;
    transform: translateY(100%);
  }

  .results-panel.visible {
    transform: translateY(0);
  }

  .main-content.with-panel .content-area {
    max-width: 100%;
    padding-bottom: calc(50vh + 2rem);
  }
}