/**
 * WebCraft Platform - Complete CSS Styling
 * Dark theme optimized for learning with clean, modern design
 */

/* ============================================================================
   CSS Variables - Theme & Design Tokens
   ============================================================================ */

:root {
  /* Colors */
  --color-bg-primary: #0f1419;
  --color-bg-secondary: #1a1f2e;
  --color-bg-tertiary: #252d3d;
  --color-text-primary: #e8eaed;
  --color-text-secondary: #9aa0a6;
  --color-text-muted: #5f6368;
  --color-border: #3c4452;
  --color-border-light: #4a5568;

  /* Accent Colors */
  --color-accent-primary: #4f46e5;
  --color-accent-secondary: #10b981;
  --color-accent-warning: #f59e0b;
  --color-accent-danger: #ef4444;

  /* Difficulty Colors */
  --color-beginner: #10b981;
  --color-intermediate: #f59e0b;
  --color-advanced: #ef4444;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue',
    Arial, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-md: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 2rem;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);

  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 200ms ease-in-out;
  --transition-slow: 300ms ease-in-out;
}

/* ============================================================================
   Reset & Base Styles
   ============================================================================ */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  background-color: var(--color-bg-primary);
  color: var(--color-text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ============================================================================
   Typography
   ============================================================================ */

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
}

h1 {
  font-size: var(--font-size-2xl);
}

h2 {
  font-size: var(--font-size-xl);
}

h3 {
  font-size: var(--font-size-lg);
}

p {
  margin-bottom: var(--spacing-md);
  color: var(--color-text-secondary);
}

a {
  color: var(--color-accent-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-accent-secondary);
}

/* ============================================================================
   Buttons
   ============================================================================ */

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  font-size: var(--font-size-md);
  font-weight: 500;
}

.btn-done {
  background-color: var(--color-accent-primary);
  color: white;
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-md);
  font-weight: 600;
}

.btn-done:hover:not(.completed) {
  background-color: #4338ca;
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-done.completed {
  background-color: var(--color-accent-secondary);
}

.btn-send {
  background-color: var(--color-accent-primary);
  color: white;
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-md);
  font-weight: 600;
}

.btn-send:hover {
  background-color: #4338ca;
}

/* ============================================================================
   Layout - Main Container
   ============================================================================ */

.webcraft-app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background-color: var(--color-bg-primary);
}

.webcraft-container {
  display: flex;
  flex: 1;
  overflow: hidden;
}

.webcraft-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* ============================================================================
   Header
   ============================================================================ */

.webcraft-header {
  background-color: var(--color-bg-secondary);
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-lg) var(--spacing-xl);
  box-shadow: var(--shadow-md);
}

.header-content {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-xl);
}

.header-title h1 {
  margin: 0;
  font-size: var(--font-size-2xl);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.header-title p {
  margin: 0;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.header-progress {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  min-width: 300px;
}

.progress-bar {
  flex: 1;
  height: 8px;
  background-color: var(--color-bg-tertiary);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-accent-primary), var(--color-accent-secondary));
  border-radius: var(--radius-lg);
  transition: width var(--transition-slow);
}

.progress-text {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  white-space: nowrap;
}

.progress-text .percentage {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-text-primary);
}

.progress-text .count {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
}

/* ============================================================================
   Sidebar
   ============================================================================ */

.webcraft-sidebar {
  width: 280px;
  background-color: var(--color-bg-secondary);
  border-right: 1px solid var(--color-border);
  overflow-y: auto;
  padding: var(--spacing-lg);
}

.sidebar-content {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl);
}

.project-section {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.section-title {
  font-size: var(--font-size-md);
  font-weight: 600;
  color: var(--color-text-primary);
  margin: 0;
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--color-border);
}

.project-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.project-button {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  background-color: var(--color-bg-tertiary);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  text-align: left;
  transition: all var(--transition-fast);
  cursor: pointer;
}

.project-button:hover {
  background-color: var(--color-bg-primary);
  border-color: var(--color-border-light);
  color: var(--color-text-primary);
}

.project-button.selected {
  background-color: var(--color-accent-primary);
  border-color: var(--color-accent-primary);
  color: white;
}

.project-button.completed {
  opacity: 0.7;
}

.project-status {
  font-size: var(--font-size-md);
  min-width: 1.5rem;
}

.project-name {
  flex: 1;
  font-size: var(--font-size-sm);
  font-weight: 500;
}

/* ============================================================================
   Tabs
   ============================================================================ */

.tabs {
  display: flex;
  gap: var(--spacing-md);
  padding: var(--spacing-lg) var(--spacing-xl);
  background-color: var(--color-bg-secondary);
  border-bottom: 1px solid var(--color-border);
}

.tab-button {
  padding: var(--spacing-md) var(--spacing-lg);
  background: none;
  color: var(--color-text-secondary);
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  font-weight: 500;
}

.tab-button:hover {
  color: var(--color-text-primary);
}

.tab-button.active {
  color: var(--color-accent-primary);
  border-bottom-color: var(--color-accent-primary);
}

.tab-content {
  flex: 1;
  overflow: hidden;
  display: flex;
}

.tab-pane {
  flex: 1;
  display: none;
  overflow-y: auto;
}

.tab-pane.active {
  display: flex;
}

/* ============================================================================
   Main Content
   ============================================================================ */

.webcraft-main {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-xl);
}

.empty-state {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: var(--color-text-secondary);
  font-size: var(--font-size-lg);
}

.project-content {
  max-width: 900px;
  margin: 0 auto;
}

.project-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-2xl);
  padding-bottom: var(--spacing-xl);
  border-bottom: 1px solid var(--color-border);
}

.project-header h2 {
  margin: 0;
  font-size: var(--font-size-2xl);
}

.project-meta {
  display: flex;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-md);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.difficulty {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: var(--font-size-xs);
  text-transform: uppercase;
}

.difficulty.beginner {
  background-color: rgba(16, 185, 129, 0.1);
  color: var(--color-beginner);
}

.difficulty.intermediate {
  background-color: rgba(245, 158, 11, 0.1);
  color: var(--color-intermediate);
}

.difficulty.advanced {
  background-color: rgba(239, 68, 68, 0.1);
  color: var(--color-advanced);
}

.project-sections {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2xl);
}

.project-section h3 {
  margin: 0;
  font-size: var(--font-size-lg);
  color: var(--color-text-primary);
}

.project-section p {
  margin: 0;
  line-height: 1.8;
}

.topics-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.topic-badge {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.requirements-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.requirements-list li {
  display: flex;
  gap: var(--spacing-lg);
  padding: var(--spacing-lg);
  background-color: var(--color-bg-tertiary);
  border-left: 3px solid var(--color-accent-primary);
  border-radius: var(--radius-md);
}

.req-number {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 2.5rem;
  height: 2.5rem;
  background-color: var(--color-accent-primary);
  color: white;
  border-radius: var(--radius-md);
  font-weight: 700;
  font-size: var(--font-size-sm);
}

.req-text {
  display: flex;
  align-items: center;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ============================================================================
   Chat Interface
   ============================================================================ */

.chat-container {
  display: flex;
  flex-direction: column;
  height: 100%;
  gap: var(--spacing-lg);
  padding: var(--spacing-lg);
}

.chat-empty {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: var(--color-text-secondary);
  font-size: var(--font-size-lg);
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
  padding: var(--spacing-lg);
  background-color: var(--color-bg-tertiary);
  border-radius: var(--radius-lg);
}

.chat-message {
  display: flex;
  gap: var(--spacing-md);
  animation: slideIn var(--transition-base) ease-out;
}

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

.chat-message.user {
  justify-content: flex-end;
}

.chat-message.assistant {
  justify-content: flex-start;
}

.message-content {
  max-width: 70%;
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-lg);
  line-height: 1.6;
}

.chat-message.user .message-content {
  background-color: var(--color-accent-primary);
  color: white;
}

.chat-message.assistant .message-content {
  background-color: var(--color-bg-secondary);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
}

.chat-input-area {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.quick-prompts {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.quick-prompt {
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: var(--color-bg-tertiary);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.quick-prompt:hover {
  background-color: var(--color-accent-primary);
  color: white;
  border-color: var(--color-accent-primary);
}

.input-form {
  display: flex;
  gap: var(--spacing-md);
}

.chat-input {
  flex: 1;
  padding: var(--spacing-md);
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-family: inherit;
  font-size: var(--font-size-md);
  transition: border-color var(--transition-fast);
}

.chat-input:focus {
  outline: none;
  border-color: var(--color-accent-primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.chat-input::placeholder {
  color: var(--color-text-muted);
}

/* ============================================================================
   Scrollbars
   ============================================================================ */

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: var(--radius-md);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-border-light);
}

/* ============================================================================
   Responsive Design
   ============================================================================ */

@media (max-width: 1024px) {
  .webcraft-sidebar {
    width: 240px;
  }

  .header-content {
    flex-direction: column;
    gap: var(--spacing-md);
  }

  .header-progress {
    width: 100%;
    min-width: unset;
  }
}

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

  .webcraft-sidebar {
    width: 100%;
    border-right: none;
    border-bottom: 1px solid var(--color-border);
    max-height: 200px;
    padding: var(--spacing-md);
  }

  .sidebar-content {
    flex-direction: row;
    gap: var(--spacing-lg);
    overflow-x: auto;
  }

  .project-section {
    flex-shrink: 0;
    min-width: 200px;
  }

  .webcraft-main {
    padding: var(--spacing-md);
  }

  .project-header {
    flex-direction: column;
    gap: var(--spacing-lg);
  }

  .tabs {
    padding: var(--spacing-md);
  }

  .message-content {
    max-width: 85%;
  }

  .requirements-list li {
    flex-direction: column;
    gap: var(--spacing-md);
  }

  .req-number {
    width: 100%;
  }
}

@media (max-width: 480px) {
  :root {
    --spacing-lg: 1rem;
    --spacing-xl: 1.5rem;
  }

  .header-title h1 {
    font-size: var(--font-size-xl);
  }

  .project-header h2 {
    font-size: var(--font-size-xl);
  }

  .progress-text {
    align-items: flex-start;
  }

  .quick-prompts {
    flex-direction: column;
  }

  .quick-prompt {
    width: 100%;
  }

  .input-form {
    flex-direction: column;
  }

  .chat-input,
  .btn-send {
    width: 100%;
  }
}