styles.css

:root {
    --color-1: #696cef;
    --color-2: #6dcbf1;
    --color-3: #280380;
    
    --primary: var(--color-1);
    --primary-light: var(--color-2);
    --secondary: var(--color-3);
    
    --text: #1f2937;
    --text-light: #4b5563;
    --bg: #f8fafc;
    --card-bg: #ffffff;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-hover: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --transition-duration: 0.3s;
    --max-card-height: 600px;
  }
  
  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text);
    background: var(--bg);
    padding: 2rem 1rem;
    transition: background var(--transition-duration), color var(--transition-duration);
  }
  
  .container {
    max-width: 1200px;
    margin: 0 auto;
  }
  
  header {
    text-align: center;
    margin-bottom: 4rem;
  }
  
  h1 {
    font-size: 2.5rem;
    color: var(--primary);
    margin-bottom: 1rem;
    line-height: 1.2;
  }
  
  .subtitle {
    font-size: 1.25rem;
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto;
  }
  
  .grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    padding: 1rem;
  }
  
  .card {
    background: var(--card-bg);
    border-radius: 1rem;
    padding: 2rem;
    box-shadow: var(--shadow);
    transition: transform var(--transition-duration) ease, box-shadow var(--transition-duration) ease;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    height: 100%;
  }
  
  .card:hover,
  .card:focus-within {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
  }
  
  .card-header {
    display: flex;
    align-items: center;
    margin-bottom: 1.5rem;
  }
  
  .card-number {
    background: var(--primary);
    color: white;
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    margin-right: 1rem;
    flex-shrink: 0;
  }
  
  .card-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text);
  }
  
  .card-content {
    color: var(--text-light);
    flex-grow: 1;
    display: flex;
    flex-direction: column;
  }
  
  .card-content p {
    margin-bottom: 1rem;
    line-height: 1.5;
  }
  
  .card-list {
    list-style: none;
    margin-top: 0.5rem;
    flex-grow: 1;
    font-size: 0.8rem;
  }
  
  .card-list li {
    margin-bottom: 0.75rem;
    display: flex;
    align-items: flex-start;
    line-height: 1.4;
  }
  
  .card-list li::before {
    content: "•";
    color: var(--primary);
    font-weight: bold;
    margin-right: 0.5rem;
    margin-top: 0.2rem;
    flex-shrink: 0;
  }
  
  .expandable-button {
    background: none;
    border: none;
    color: var(--primary);
    cursor: pointer;
    text-align: left;
    padding: 0;
    font-size: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 500;
  }
  
  .expandable-button:focus {
    outline: 2px solid var(--primary-light);
  }
  
  .expandable-button::before {
    content: "▼";
    display: inline-block;
    margin-right: 0.5rem;
    transition: transform var(--transition-duration) ease;
  }
  
  .expandable-button[aria-expanded="true"]::before {
    transform: rotate(180deg);
  }
  
  .sub-list {
    list-style: none;
    margin-top: 0.5rem;
    padding-left: 1rem;
    display: none;
    transition: max-height var(--transition-duration) ease;
  }
  
  .sub-list.visible {
    display: block;
  }
  
  .code-preview {
    background: #1a1a1a;
    color: #fff;
    padding: 1rem;
    border-radius: 0.5rem;
    font-family: Consolas, Monaco, 'Andale Mono', 'Ubuntu Mono', monospace;
    font-size: 0.85rem;
    margin-top: 1rem;
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-duration) ease, opacity var(--transition-duration) ease;
    opacity: 0;
  }
  
  .code-preview.visible {
    max-height: 1000px;
    opacity: 1;
  }
  
  .code-container {
    position: relative;
  }
  
  .copy-button, .toggle-button {
    background: var(--secondary);
    color: white;
    border: none;
    padding: 0.3rem 0.6rem;
    border-radius: 0.25rem;
    cursor: pointer;
    font-size: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: background var(--transition-duration) ease;
  }
  
  .copy-button:hover,
  .copy-button:focus,
  .toggle-button:hover,
  .toggle-button:focus {
    background: var(--primary);
  }
  
  #progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    width: 0;
    height: 4px;
    background: var(--primary);
    z-index: 1000;
    transition: width var(--transition-duration) ease;
  }
  
  .back-to-top {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: var(--primary);
    color: white;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    cursor: pointer;
    opacity: 0;
    transition: opacity var(--transition-duration) ease;
    z-index: 1000;
  }
  
  .back-to-top.visible {
    opacity: 1;
  }
  
  footer {
    text-align: center;
    margin-top: 4rem;
    padding: 2rem 0;
    background: var(--card-bg);
    border-top: 1px solid var(--text-light);
  }
  
  button:focus,
  .copy-button:focus,
  .toggle-button:focus,
  .back-to-top:focus {
    outline: 2px solid var(--primary-light);
    outline-offset: 2px;
  }
  
  @media (max-width: 768px) {
    body {
      padding: 1rem;
    }
  
    h1 {
      font-size: 2rem;
    }
  
    .grid {
      grid-template-columns: 1fr;
    }
  
    .card {
      padding: 1.5rem;
    }
  
    .copy-button, .toggle-button {
      padding: 0.2rem 0.4rem;
      font-size: 0.7rem;
    }
  }
  
  /* PrismJS Styles for Syntax Highlighting */
  .code-preview pre code[class*="language-"] {
    color: var(--color-1);
    text-shadow: 0 0 2px #100c0f, 0 0 5px #dc078e33, 0 0 10px #fff3;
    background: none;
    font-family: Consolas, Monaco, 'Andale Mono', 'Ubuntu Mono', monospace;
    font-size: 1em;
    text-align: left;
    white-space: pre;
    word-spacing: normal;
    word-break: normal;
    word-wrap: normal;
    line-height: 1.5;
    tab-size: 4;
    hyphens: none;
  }
  
  .code-preview pre {
    padding: 1em;
    margin: 0.5em 0;
    overflow: auto;
  }
  
  .code-preview:not(pre) > code[class*="language-"],
  .code-preview pre[class*="language-"] {
    background-color: transparent !important;
    background-image: linear-gradient(to bottom, #2a2139 75%, #34294f);
  }
  
  .code-preview:not(pre) > code[class*="language-"] {
    padding: 0.1em;
    border-radius: 0.3em;
    white-space: normal;
  }
  
  /* Token Styles */
  .token.comment,
  .token.block-comment,
  .token.prolog,
  .token.doctype,
  .token.cdata {
    color: #8e8e8e;
  }
  
  .token.punctuation {
    color: #ccc;
  }
  
  .token.tag,
  .token.attr-name,
  .token.namespace,
  .token.number,
  .token.unit,
  .token.hexcode,
  .token.deleted {
    color: #e2777a;
  }
  
  .token.property,
  .token.selector {
    color: #72f1b8;
    text-shadow: 0 0 2px #100c0f, 0 0 10px #257c5575, 0 0 35px #21272475;
  }
  
  .token.function-name {
    color: #6196cc;
  }
  
  .token.boolean,
  .token.selector .token.id,
  .token.function {
    color: #fdfdfd;
    text-shadow: 0 0 2px #001716, 0 0 3px #03edf975, 0 0 5px #03edf975, 0 0 8px #03edf975;
  }
  
  .token.class-name {
    color: #fff5f6;
    text-shadow: 0 0 2px #000, 0 0 10px #fc1f2c75, 0 0 5px #fc1f2c75, 0 0 25px #fc1f2c75;
  }
  
  .token.constant,
  .token.symbol {
    color: var(--color-1);
    text-shadow: 0 0 2px #100c0f, 0 0 5px #dc078e33, 0 0 10px #fff3;
  }
  
  .token.important,
  .token.atrule,
  .token.keyword,
  .token.selector .token.class,
  .token.builtin {
    color: #f4eee4;
    text-shadow: 0 0 2px #393a33, 0 0 8px #f39f0575, 0 0 2px #f39f0575;
  }
  
  .token.string,
  .token.char,
  .token.attr-value,
  .token.regex,
  .token.variable {
    color: #f87c32;
  }
  
  .token.operator,
  .token.entity,
  .token.url {
    color: #67cdcc;
  }
  
  .token.important,
  .token.bold {
    font-weight: bold;
  }
  
  .token.italic {
    font-style: italic;
  }
  
  .token.entity {
    cursor: help;
  }
  
  .token.inserted {
    color: green;
  }