/*(Variables)*/
    :root {
  --primary-bg:       #12151a;
  --secondary-bg:     #1c2231;
  --card-bg:          #242b3d;
  --accent-color:     #ff6b6b;
  --accent-hover:     #ee5253;
  --text-primary:     #ffffff;
  --text-secondary:   #bcccdc;
  --text-muted:       #8a97a4;
  --border-color:     #323a4a;
  --shadow-color:     rgba(0, 0, 0, 0.3), rgba(255, 255, 255, 0.05);
  --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-accent:  linear-gradient(135deg, #ff6b6b 0%, #ff6a88 100%);


      --sidebar-width: 280px;
      --sidebar-collapsed: 70px;
      --border-radius: 12px;
      --transition-speed: 0.3s;
      --box-shadow: 0 8px 32px var(--shadow-color);
    }

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

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

    body {
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      background: var(--primary-bg);
      color: var(--text-primary);
      line-height: 1.6;
      overflow-x: hidden;
    }

    /*LAYOUT SYSTEM*/
    .app-container {
      display: flex;
      min-height: 100vh;
    }

    /* Sidebar */
    .sidebar {
      position: fixed;
      top: 0;
      left: 0;
      width: var(--sidebar-width);
      height: 100vh;
      background: var(--secondary-bg);
      backdrop-filter: blur(10px);
      border-right: 1px solid var(--border-color);
      transition: width var(--transition-speed) cubic-bezier(0.4, 0, 0.2, 1);
      z-index: 1000;
      overflow: hidden;
    }

    .sidebar.collapsed {
      width: var(--sidebar-collapsed);
    }

    .sidebar-header {
      padding: 1.5rem;
      border-bottom: 1px solid var(--border-color);
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .logo {
      font-size: 1.5rem;
      font-weight: 700;
      background: var(--gradient-accent);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      opacity: 1;
      transition: opacity var(--transition-speed);
    }

    .sidebar.collapsed .logo {
      opacity: 0;
    }

    .toggle-btn {
      background: none;
      border: none;
      color: var(--text-primary);
      font-size: 1.25rem;
      cursor: pointer;
      padding: 0.5rem;
      border-radius: var(--border-radius);
      transition: all var(--transition-speed);
    }

    .toggle-btn:hover {
      background: var(--card-bg);
      transform: rotate(90deg);
    }

    /* Navigation */
    .nav-list {
      list-style: none;
      padding: 1rem 0;
    }

    .nav-item {
      margin: 0.5rem 0;
    }

    .nav-link {
      display: flex;
      align-items: center;
      padding: 1rem 1.5rem;
      color: var(--text-secondary);
      text-decoration: none;
      transition: all var(--transition-speed);
      position: relative;
      overflow: hidden;
    }

    .nav-link:hover,
    .nav-link.active {
      color: var(--text-primary);
      background: var(--card-bg);
    }

    .nav-link::before {
      content: '';
      position: absolute;
      left: 0;
      top: 0;
      height: 100%;
      width: 4px;
      background: var(--gradient-accent);
      transform: scaleY(0);
      transition: transform var(--transition-speed);
    }

    .nav-link:hover::before,
    .nav-link.active::before {
      transform: scaleY(1);
    }

    .nav-icon {
      font-size: 1.25rem;
      min-width: 1.5rem;
      margin-right: 1rem;
    }

    .nav-text {
      font-weight: 500;
      opacity: 1;
      transition: opacity var(--transition-speed);
    }

    .sidebar.collapsed .nav-text {
      opacity: 0;
    }

    /* Main Content */
    .main-content {
      flex: 1;
      margin-left: var(--sidebar-width);
      transition: margin-left var(--transition-speed);
      background: var(--primary-bg);
    }

    .sidebar.collapsed ~ .main-content {
      margin-left: var(--sidebar-collapsed);
    }

    .content-wrapper {
      padding: 2rem;
      max-width: 1400px;
      margin: 0 auto;
    }

    /*SECTION COMPONENTS*/
    .section {
      margin-bottom: 4rem;
      opacity: 0;
      transform: translateY(30px);
      animation: fadeInUp 0.8s ease-out forwards;
    }

    .section:nth-child(even) {
      animation-delay: 0.1s;
    }

    .section:nth-child(odd) {
      animation-delay: 0.2s;
    }

    .section-title {
      font-size: 2.5rem;
      font-weight: 700;
      margin-bottom: 2rem;
      background: var(--gradient-primary);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      position: relative;
    }

    .section-title::after {
      content: '';
      position: absolute;
      bottom: -0.5rem;
      left: 0;
      width: 60px;
      height: 4px;
      background: var(--gradient-accent);
      border-radius: 2px;
    }

    /*HERO SECTION*/
    .hero {
      padding: 4rem 0;
      text-align: center;
      background: radial-gradient(ellipse at center, rgba(0, 212, 170, 0.1) 0%, transparent 70%);
    }

    .hero-title {
      font-size: 3.5rem;
      font-weight: 800;
      margin-bottom: 1rem;
      background: var(--gradient-primary);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .hero-subtitle {
      font-size: 1.5rem;
      color: var(--text-secondary);
      margin-bottom: 2rem;
    }

    .dynamic-text {
      font-size: 1.5rem;
      color: var(--accent-color);
      font-weight: 600;
      margin: 2rem 0;
      min-height: 2rem;
    }

    .animated-text {
      display: inline-block;
      position: relative;
    }

    .animated-text::after {
      content: '|';
      color: var(--accent-color);
      animation: blink 1s infinite;
    }

    .hero-description {
      font-size: 1.1rem;
      color: var(--text-secondary);
      max-width: 800px;
      margin: 0 auto 2rem;
      line-height: 1.8;
    }

    /*BUTTON COMPONENTS*/
    .btn {
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
      padding: 1rem 2rem;
      border: none;
      border-radius: var(--border-radius);
      font-weight: 600;
      text-decoration: none;
      cursor: pointer;
      transition: all var(--transition-speed);
      position: relative;
      overflow: hidden;
    }

    .btn-primary {
      background: var(--gradient-accent);
      color: var(--text-primary);
      box-shadow: var(--box-shadow);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 12px 40px var(--shadow-color);
    }

    .btn-secondary {
      background: var(--card-bg);
      color: var(--text-primary);
      border: 1px solid var(--border-color);
    }

    .btn-secondary:hover {
      background: var(--secondary-bg);
      border-color: var(--accent-color);
    }

    /*CARD COMPONENTS*/
    .card-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
      gap: 2rem;
      margin-top: 2rem;
    }

    .card {
      background: var(--card-bg);
      border: 1px solid var(--border-color);
      border-radius: var(--border-radius);
      padding: 2rem;
      transition: all var(--transition-speed);
      position: relative;
      overflow: hidden;
    }

    .card::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 4px;
      background: var(--gradient-accent);
      transform: scaleX(0);
      transition: transform var(--transition-speed);
    }

    .card:hover {
      border-color: var(--accent-color);
      transform: translateY(-8px);
      box-shadow: var(--box-shadow);
    }

    .card:hover::before {
      transform: scaleX(1);
    }

    .card-title {
      font-size: 1.5rem;
      font-weight: 600;
      margin-bottom: 1rem;
      color: var(--text-primary);
    }

    .card-meta {
      color: var(--text-muted);
      font-size: 0.9rem;
      margin-bottom: 1.5rem;
    }

    .card-links {
      display: flex;
      gap: 1rem;
      margin-bottom: 1.5rem;
    }

    .card-link {
      color: var(--accent-color);
      font-size: 1.25rem;
      transition: all var(--transition-speed);
    }

    .card-link:hover {
      color: var(--accent-hover);
      transform: scale(1.2);
    }

    /*SKILLS SECTION*/
    .skills-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 2rem;
      margin-top: 2rem;
    }

    .skill-category {
      background: var(--card-bg);
      border: 1px solid var(--border-color);
      border-radius: var(--border-radius);
      padding: 2rem;
    }

    .skill-category-title {
      font-size: 1.25rem;
      font-weight: 600;
      margin-bottom: 1.5rem;
      color: var(--accent-color);
    }

    .skill-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 0.75rem;
    }

    .skill-tag {
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
      background: var(--secondary-bg);
      border: 1px solid var(--border-color);
      border-radius: 25px;
      padding: 0.5rem 1rem;
      font-size: 0.9rem;
      color: var(--text-primary);
      transition: all var(--transition-speed);
    }

    .skill-tag:hover {
      background: var(--accent-color);
      color: var(--primary-bg);
      transform: translateY(-2px);
    }

    /* LIST COMPONENTS*/
    .custom-list {
      list-style: none;
      margin-top: 1rem;
    }

    .custom-list li {
      position: relative;
      padding-left: 1.5rem;
      margin-bottom: 0.75rem;
      color: var(--text-secondary);
      line-height: 1.6;
    }

    .custom-list li::before {
      content: '▶';
      position: absolute;
      left: 0;
      color: var(--accent-color);
      font-size: 0.75rem;
    }

    /*CONTACT SECTION*/
    .contact-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: 1.5rem;
      margin-top: 2rem;
    }

    .contact-item {
      display: flex;
      align-items: center;
      gap: 1rem;
      padding: 1.5rem;
      background: var(--card-bg);
      border: 1px solid var(--border-color);
      border-radius: var(--border-radius);
      color: var(--text-primary);
      text-decoration: none;
      transition: all var(--transition-speed);
    }

    .contact-item:hover {
      background: var(--secondary-bg);
      border-color: var(--accent-color);
      transform: translateY(-4px);
    }

    .contact-icon {
      font-size: 1.5rem;
      color: var(--accent-color);
    }

    /*ANIMATIONS*/
    @keyframes fadeInUp {
      from {
        opacity: 0;
        transform: translateY(30px);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    @keyframes blink {
      0%, 50% { opacity: 1; }
      51%, 100% { opacity: 0; }
    }

    @keyframes float {
      0%, 100% { transform: translateY(0px); }
      50% { transform: translateY(-10px); }
    }

    /*RESPONSIVE DESIGN*/
    @media (max-width: 768px) {
      :root {
        --sidebar-width: 100%;
        --sidebar-collapsed: 0;
      }

      .sidebar {
        transform: translateX(-100%);
        transition: transform var(--transition-speed);
      }

      .sidebar.open {
        transform: translateX(0);
      }

      .sidebar.collapsed {
        transform: translateX(-100%);
      }

      .main-content {
        margin-left: 0;
      }

      .sidebar.collapsed ~ .main-content {
        margin-left: 0;
      }

      .hero-title {
        font-size: 2.5rem;
      }

      .section-title {
        font-size: 2rem;
      }

      .content-wrapper {
        padding: 1rem;
      }

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

      .skills-grid {
        grid-template-columns: 1fr;
      }

      .contact-grid {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 480px) {
      .hero-title {
        font-size: 2rem;
      }

      .hero-subtitle {
        font-size: 1.25rem;
      }

      .dynamic-text {
        font-size: 1.25rem;
      }
    }

    /*UTILITY CLASSES*/
    .text-center { text-align: center; }
    .text-muted { color: var(--text-muted); }
    .mb-1 { margin-bottom: 1rem; }
    .mb-2 { margin-bottom: 2rem; }
    .mt-2 { margin-top: 2rem; }
    .hidden { display: none; }

    /*Smooth scroll offset for fixed header*/
    .section {
      scroll-margin-top: 2rem;
    }