:root {
        --primary-color: #000000;
        --text-color: #1f2937;
        --text-muted: #6b7280;
        --bg-color: #ffffff;
        --border-color: #e5e7eb;
        --grid-dot-color: #e5e7eb;
      }

      [data-theme="dark"] {
        --primary-color: #ffffff;
        --text-color: #f9fafb;
        --text-muted: #9ca3af;
        --bg-color: #111827;
        --border-color: #374151;
        --grid-dot-color: #374151;
      }

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

      body {
        font-family: "Lora", serif;
        background: var(--bg-color);
        background-image: radial-gradient(
          circle,
          var(--grid-dot-color) 1px,
          transparent 1px
        );
        background-size: 24px 24px;
        color: var(--text-color);
        line-height: 1.6;
        overflow-x: hidden;
      }

      /* Navbar */
      .navbar {
        background: rgba(255, 255, 255, 0.95);
        backdrop-filter: blur(10px);
        border-bottom: 1px solid var(--border-color);
        padding: 0.75rem 1.5rem;
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        z-index: 1000;
        display: flex;
        align-items: center;
        justify-content: space-between;
        overflow: hidden;
      }

      [data-theme="dark"] .navbar {
        background: rgba(17, 24, 39, 0.95);
      }

      .navbar-left {
        display: flex;
        align-items: center;
        gap: 1rem;
      }

      .robot-icon {
        width: 32px;
        height: 32px;
        display: flex;
        align-items: center;
        justify-content: center;
        flex-shrink: 0;
        color: var(--primary-color);
      }

      .navbar-right {
        display: flex;
        align-items: center;
      }

      .theme-toggle {
        background: none;
        border: 2px solid var(--border-color);
        border-radius: 8px;
        padding: 0.5rem;
        cursor: pointer;
        display: flex;
        align-items: center;
        justify-content: center;
        color: var(--text-color);
        transition: all 0.2s ease;
        width: 40px;
        height: 40px;
        position: relative;
      }

      .theme-toggle:hover {
        border-color: var(--primary-color);
        background: var(--border-color);
      }

      .theme-icon {
        position: absolute;
        transition: opacity 0.2s ease, transform 0.2s ease;
      }

      .moon-icon {
        opacity: 0;
        transform: rotate(90deg);
      }

      [data-theme="dark"] .sun-icon {
        opacity: 0;
        transform: rotate(90deg);
      }

      [data-theme="dark"] .moon-icon {
        opacity: 1;
        transform: rotate(0deg);
      }

      .sun-icon {
        opacity: 1;
        transform: rotate(0deg);
      }

      /* Footer */
      .footer {
        background: rgba(255, 255, 255, 0.95);
        backdrop-filter: blur(10px);
        border-top: 1px solid var(--border-color);
        padding: 2rem 1.5rem;
        display: flex;
        align-items: center;
        justify-content: center;
        min-height: 80px;
      }

      [data-theme="dark"] .footer {
        background: rgba(17, 24, 39, 0.95);
      }

      .footer-text {
        font-size: 0.9rem;
        color: var(--text-color);
        text-align: center;
      }

      /* Copyright Section */
      .copyright-section {
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 1rem;
        margin-top: 4rem;
      }

      .copyright-btn {
        background: var(--bg-color);
        border: 2px solid var(--border-color);
        border-radius: 12px;
        padding: 0.75rem 1.25rem;
        cursor: pointer;
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 0.5rem;
        color: var(--text-color);
        font-size: 0.9rem;
        font-weight: 500;
        transition: all 0.3s ease;
        font-family: "Lora", serif;
      }

      .copyright-btn:hover {
        border-color: var(--primary-color);
        background: var(--primary-color);
        color: var(--bg-color);
        transform: translateY(-2px);
      }

      .copyright-btn.copied {
        background: var(--primary-color);
        border-color: var(--primary-color);
        color: var(--bg-color);
      }

      .copyright-text {
        font-size: 0.9rem;
        color: var(--text-muted);
        text-align: center;
        padding: 0.5rem 1rem;
        animation: fadeInUp 0.4s ease-out;
      }

      /* Main Container */
      .container {
        max-width: 1400px;
        margin: 0 auto;
        padding: 4rem 2rem 6rem;
      }

      /* Hero Section */
      .hero {
        text-align: center;
        margin-bottom: 6rem;
        padding: 4rem 0;
      }

      .hero h1 {
        font-size: 4rem;
        font-weight: 800;
        margin-bottom: 1rem;
        color: var(--primary-color);
        letter-spacing: -0.02em;
      }

      .hero .titles {
        font-size: 1.5rem;
        color: var(--text-muted);
        font-weight: 400;
        margin-bottom: 3rem;
      }

      .hero .titles span {
        display: inline-block;
        margin: 0 1rem;
      }

      .hero-tagline {
        font-size: 1.25rem;
        color: var(--text-muted);
        font-weight: 400;
        margin-top: 1.5rem;
        margin-bottom: 3rem;
        line-height: 1.6;
      }

      /* Navigation Icons */
      .nav-icons {
        display: flex;
        justify-content: center;
        gap: 3rem;
        margin-top: 4rem;
        flex-wrap: wrap;
      }

      .nav-icon {
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 1rem;
        cursor: pointer;
        transition: transform 0.2s ease;
        text-decoration: none;
        color: var(--text-color);
      }

      .nav-icon:hover {
        transform: translateY(-5px);
      }

      .nav-icon-box {
        width: 80px;
        height: 80px;
        background: var(--bg-color);
        border: 2px solid var(--border-color);
        border-radius: 16px;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 2rem;
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
        transition: all 0.2s ease;
      }

      .nav-icon:hover .nav-icon-box {
        border-color: var(--primary-color);
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
      }

      .nav-icon-label {
        font-size: 0.9rem;
        font-weight: 500;
        color: var(--text-color);
      }

      /* Apps Section */
      .apps-section {
        margin-top: 6rem;
      }

      .section-title {
        font-size: 2.5rem;
        font-weight: 700;
        margin-bottom: 1rem;
        text-align: center;
        color: var(--primary-color);
      }

      .section-description {
        font-size: 1.1rem;
        color: var(--text-muted);
        font-weight: 400;
        margin-bottom: 3rem;
        text-align: center;
        line-height: 1.6;
      }

      .apps-grid {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: 2rem;
        margin-top: 3rem;
      }

      .app-card {
        background: var(--bg-color);
        border: 2px solid var(--border-color);
        border-radius: 16px;
        overflow: hidden;
        transition: all 0.3s ease;
        display: flex;
        align-items: center;
        justify-content: center;
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
        cursor: pointer;
        text-decoration: none;
        color: inherit;
        width: 80px;
        height: 80px;
      }

      .app-card:hover {
        transform: translateY(-5px);
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
        border-color: var(--primary-color);
      }

      .app-icon {
        width: 32px;
        height: 32px;
        display: flex;
        align-items: center;
        justify-content: center;
        color: var(--primary-color);
      }

      .app-icon svg {
        width: 100%;
        height: 100%;
      }

      /* Responsive */
      @media (max-width: 768px) {
        .navbar {
          padding: 0.5rem 1rem;
        }

        .robot-icon {
          width: 28px;
          height: 28px;
          font-size: 1.3rem;
        }

        .container {
          padding: 4rem 1.5rem 6rem;
        }

        .hero h1 {
          font-size: 2.5rem;
        }

        .hero .titles {
          font-size: 1.1rem;
        }

        .hero .titles span {
          display: block;
          margin: 0.5rem 0;
        }

        .nav-icons {
          gap: 2rem;
        }

        .nav-icon-box {
          width: 60px;
          height: 60px;
          font-size: 1.5rem;
        }

        .nav-icon-label {
          font-size: 0.8rem;
        }

        .copyright-section {
          margin-top: 3rem;
        }

        .copyright-btn {
          padding: 0.6rem 1rem;
          font-size: 0.85rem;
        }

        .apps-grid {
          gap: 1rem;
          display: grid;
          grid-template-columns: repeat(3, 1fr);
          justify-items: center;
        }

        .app-card {
          width: 60px;
          height: 60px;
        }

        .app-icon {
          width: 24px;
          height: 24px;
        }

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

        .modal-content {
          max-width: 90%;
          padding: 1.5rem;
        }
      }

      @media (max-width: 480px) {
        .container {
          padding: 4rem 1rem 6rem;
        }

        .hero h1 {
          font-size: 2rem;
        }

        .nav-icons {
          gap: 1.5rem;
        }
      }

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

      .fade-in-up {
        animation: fadeInUp 0.6s ease-out;
      }

      /* Modal */
      .modal-overlay {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.5);
        backdrop-filter: blur(4px);
        display: flex;
        align-items: center;
        justify-content: center;
        z-index: 2000;
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
      }

      [data-theme="dark"] .modal-overlay {
        background: rgba(0, 0, 0, 0.7);
      }

      .modal-overlay.active {
        opacity: 1;
        visibility: visible;
      }

      .modal-content {
        background: var(--bg-color);
        border: 2px solid var(--border-color);
        border-radius: 4px;
        padding: 2rem;
        max-width: 500px;
        width: 90%;
        box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
        transform: scale(0.9) translateY(20px);
        transition: transform 0.3s ease;
      }

      .modal-overlay.active .modal-content {
        transform: scale(1) translateY(0);
      }

      .modal-header {
        display: flex;
        justify-content: space-between;
        align-items: center;
        margin-bottom: 1.5rem;
      }

      .modal-title {
        font-size: 1.5rem;
        font-weight: 700;
        color: var(--primary-color);
      }

      .modal-close {
        background: none;
        border: none;
        font-size: 1.5rem;
        cursor: pointer;
        color: var(--text-muted);
        padding: 0;
        width: 32px;
        height: 32px;
        display: flex;
        align-items: center;
        justify-content: center;
        border-radius: 8px;
        transition: all 0.2s ease;
      }

      .modal-close:hover {
        background: var(--border-color);
        color: var(--text-color);
      }

      .modal-body {
        margin-bottom: 1.5rem;
      }

      .modal-form {
        display: flex;
        flex-direction: column;
        gap: 1.5rem;
      }

      .form-group {
        display: flex;
        flex-direction: column;
        gap: 0.5rem;
      }

      .form-label {
        font-size: 0.9rem;
        font-weight: 500;
        color: var(--text-color);
      }

      .form-input,
      .form-textarea {
        padding: 0.75rem;
        border: 2px solid var(--border-color);
        border-radius: 0;
        font-size: 1rem;
        font-family: "Lora", serif;
        color: var(--text-color);
        background: var(--bg-color);
        transition: border-color 0.3s ease;
      }

      .form-input:focus,
      .form-textarea:focus {
        outline: none;
        border-color: var(--primary-color);
      }

      .form-textarea {
        min-height: 120px;
        resize: vertical;
      }

      .modal-actions {
        display: flex;
        gap: 1rem;
        justify-content: center;
      }

      .modal-btn {
        padding: 0.75rem 2rem;
        border-radius: 0;
        border: 2px solid var(--primary-color);
        background: var(--primary-color);
        color: var(--bg-color);
        font-weight: 500;
        font-size: 1rem;
        cursor: pointer;
        transition: all 0.3s ease;
        text-decoration: none;
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 0.5rem;
      }

      .modal-btn:hover:not(:disabled) {
        background: var(--bg-color);
        color: var(--primary-color);
        transform: translateY(-2px);
      }

      .modal-btn:disabled {
        opacity: 0.6;
        cursor: not-allowed;
      }

      .modal-message {
        padding: 0.75rem;
        border-radius: 8px;
        margin-bottom: 1rem;
        text-align: center;
        font-size: 0.9rem;
      }

      .modal-message.success {
        background: #f0fdf4;
        border: 2px solid #22c55e;
        color: #166534;
      }

      .modal-message.error {
        background: #fef2f2;
        border: 2px solid #ef4444;
        color: #991b1b;
      }