html, body {
        scrollbar-width: none;
        -ms-overflow-style: none; /* IE and Edge */
      }
      html::-webkit-scrollbar, body::-webkit-scrollbar {
        display: none;
      }

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

      :root {
        /* Dark theme (default) - Pure Black Samsung Style */
        --bg-primary: #0a0a0a;
        --bg-secondary: #1a1a1a;
        --text-primary: #ffffff;
        --text-secondary: #b0b0b0;
        --accent: #6366f1;
        --accent-hover: #4F5BD5;
        --accent-glow: rgba(99, 102, 241, 0.3);
        --border: rgba(255, 255, 255, 0.1);
        --shadow: rgba(0, 0, 0, 0.3);
        --card-bg: rgba(255, 255, 255, 0.05);
      }

      [data-theme="dark"] {
        /* Dark theme - Pure Black */
        --bg-primary: #0a0a0a;
        --bg-secondary: #1a1a1a;
        --text-primary: #ffffff;
        --text-secondary: #b0b0b0;
        --accent: #6366f1;
        --accent-hover: #4F5BD5;
        --accent-glow: rgba(99, 102, 241, 0.3);
        --border: rgba(255, 255, 255, 0.1);
        --shadow: rgba(0, 0, 0, 0.3);
        --card-bg: rgba(255, 255, 255, 0.05);
      }

      [data-theme="light"] {
        /* Light theme - Pure White/Gray Samsung Style */
        --bg-primary: #e8e8e8;
        --bg-secondary: #d5d5d5;
        --text-primary: #2a2a2a;
        --text-secondary: #5a5a5a;
        --accent: #4f46e5;
        --accent-hover: #4338ca;
        --accent-glow: rgba(79, 70, 229, 0.25);
        --border: rgba(0, 0, 0, 0.15);
        --shadow: rgba(0, 0, 0, 0.1);
        --card-bg: rgba(255, 255, 255, 0.95);
      }

      body {
        font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
        background: var(--bg-primary);
        color: var(--text-primary);
        transition: background 0.3s ease, color 0.3s ease;
        padding: 0;
        min-height: 100vh;
        overflow-x: hidden;
      }

      .container {
        max-width: 1200px;
        margin: 0 auto;
        padding: 40px 24px;
      }

      /* Search Bar Styles */
      .nav-container {
        display: flex;
        align-items: center;
        gap: 20px;
        justify-content: flex-end; /* push theme toggle to right */
      }

      .search-container {
        position: relative;
        width: 300px;
        margin-right: auto; /* push theme toggle to right end */
      }

      /* Hide native clear for consistency */
      .search-input::-webkit-search-cancel-button { -webkit-appearance: none; }

      .search-input {
        width: 100%;
        padding: 8px 12px;
        padding-right: 60px; /* room for clear + search buttons */
        border: 1px solid var(--border);
        border-radius: 20px;
        background: var(--bg-secondary);
        color: var(--text-primary);
        caret-color: var(--text-primary);
        font-size: 0.9rem;
        transition: all 0.3s ease;
      }
      .search-input::placeholder { color: var(--text-secondary); opacity: 0.8; }
      .search-input:hover {
        border-color: var(--accent);
        box-shadow: 0 0 14px var(--accent-glow);
        background: var(--card-bg);
      }

      .search-input:focus {
        outline: none;
        border-color: var(--accent);
        box-shadow: 0 0 5px rgba(139, 92, 246, 0.3);
        background: var(--card-bg);
      }

      .search-button {
        position: absolute;
        right: 10px;
        top: 50%;
        transform: translateY(-50%);
        background: none;
        border: none;
        color: var(--text-secondary);
        cursor: pointer;
        padding: 5px;
        transition: color 0.3s ease;
      }

      .search-button:hover {
        color: var(--accent);
      }

      .search-clear {
        position: absolute;
        right: 36px;
        top: 50%;
        transform: translateY(-50%);
        background: none;
        border: none;
        color: var(--text-secondary);
        cursor: pointer;
        padding: 2px 4px;
        line-height: 1;
        border-radius: 10px;
        opacity: 0.7;
        transition: color 0.2s ease, opacity 0.2s ease, background 0.2s ease;
      }
      .search-clear:hover { color: var(--accent); opacity: 1; background: transparent; }

      .search-icon-img {
        width: 16px;
        height: 16px;
        display: block;
        object-fit: contain;
        filter: brightness(0.9) contrast(1.05);
      }
      [data-theme="light"] .search-icon-img { filter: brightness(0.6) contrast(1.1); }
      [data-theme="dark"] .search-icon-img { filter: brightness(1) contrast(1.1); }

      .search-error {
        position: absolute;
        top: calc(100% + 6px);
        left: 0;
        width: 100%;
        padding: 10px 12px;
        background: rgba(239, 68, 68, 0.95);
        color: #fff;
        border-radius: 12px;
        border: 1px solid rgba(239, 68, 68, 0.35);
        box-shadow: 0 10px 24px rgba(239, 68, 68, 0.35);
        font-size: 0.9rem;
        line-height: 1.4;
        opacity: 0;
        transform: translateY(-6px);
        transition: opacity 0.25s ease, transform 0.25s ease;
        z-index: 1000;
        pointer-events: none;
      }
      .search-error.show { opacity: 1; transform: translateY(0); }

      .desktop-search-results {
        position: absolute;
        top: calc(100% + 6px);
        left: 0;
        width: 100%;
        background: var(--card-bg);
        border: 1px solid var(--border);
        border-radius: 12px;
        box-shadow: 0 10px 24px rgba(0, 0, 0, 0.25);
        max-height: 260px;
        overflow-y: auto;
        opacity: 0;
        transform: translateY(-6px);
        transition: opacity 0.2s ease, transform 0.2s ease;
        z-index: 999;
        pointer-events: none;
      }
      .desktop-search-results.active { opacity: 1; transform: translateY(0); pointer-events: auto; }
      .desktop-search-result-item {
        display: flex;
        align-items: center;
        gap: 10px;
        padding: 10px 12px;
        cursor: pointer;
        color: var(--text-primary);
      }
      .desktop-search-result-item:hover { background: var(--bg-secondary); }
      .desktop-search-result-title { font-weight: 600; }
      .desktop-search-result-desc { font-size: 0.85rem; color: var(--text-secondary); }
      .desktop-search-result-item.no-results {
        cursor: default;
        color: #ef4444;
      }

      @media (max-width: 768px) {
        .nav-container {
          flex-direction: row;
          align-items: center;
          justify-content: space-between; /* search left, theme right */
          gap: 10px;
        }

        .search-container {
          width: auto;
          flex: 1;
          margin-right: 0;
        }

        .theme-toggle {
          margin-left: 0;
          padding: 6px 14px;
          font-size: 13px;
          flex-shrink: 0;
          width: auto !important; /* Prevent squishing */
        }

        .theme-text {
            display: inline-block !important; /* Force show text */
            margin-left: 6px;
        }
      }

      .header {
        display: flex;
        justify-content: space-between;
        align-items: center;
        margin-bottom: 40px;
      }

      h1 {
        font-size: 2.5rem;
        font-weight: 800;
        background: linear-gradient(135deg, #6366f1, #8b5cf6, #a78bfa);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
      }

      .theme-toggle {
        background: var(--card-bg);
        color: var(--text-primary);
        border: 1px solid var(--border);
        padding: 8px 18px;
        border-radius: 50px;
        font-size: 14px;
        cursor: pointer;
        transition: all 0.3s ease;
        display: flex;
        align-items: center;
        justify-content: center; /* Center icon horizontally */
        gap: 8px;
        font-weight: 600;
        user-select: none;
        flex-shrink: 0; /* never compress */
        margin-left: 8px; /* consistent spacing */
      }

      .theme-toggle:hover {
        border-color: var(--accent);
        background: var(--accent-glow);
        box-shadow: 0 0 20px var(--accent-glow);
        transform: scale(1.02);
      }

      .theme-toggle:active,
      .theme-toggle:focus-visible {
        border-color: var(--accent);
        background: var(--accent-glow);
        box-shadow: 0 0 20px var(--accent-glow);
        transform: scale(0.95);
        outline: none;
      }

      .theme-icon {
        width: 18px;
        height: 18px;
        object-fit: contain;
        transition: transform 0.3s ease;
      }

      .theme-toggle:hover .theme-icon {
        transform: rotate(20deg);
      }

      .content {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 40px;
      }

      .contact-info {
        background: transparent;
        padding: 40px;
        border-radius: 0;
        box-shadow: none;
        border: none;
      }

      .contact-info h2 {
        margin-bottom: 30px;
        color: var(--accent);
        font-weight: 700;
      }

      .info-item {
        display: flex;
        align-items: center;
        gap: 15px;
        margin-bottom: 25px;
        padding: 15px;
        background: transparent;
        border-radius: 0;
        transition: transform 0.3s ease;
        border: none;
        box-shadow: none;
      }

      .info-item:hover {
        transform: translateX(8px);
        box-shadow: none;
      }

      .info-item i {
        font-size: 1.5rem;
        color: var(--accent);
        min-width: 30px;
      }

      .info-item div {
        flex: 1;
      }

      .info-item label {
        display: block;
        font-size: 0.85rem;
        color: var(--text-secondary);
        margin-bottom: 5px;
      }

      .info-item span {
        font-size: 1rem;
        color: var(--text-primary);
      }
      .contact-link {
        font-size: 1rem;
        color: var(--accent);
        text-decoration: underline;
        text-underline-offset: 2px;
        transition: color 0.2s ease;
      }
      .contact-link:hover { color: var(--accent-hover); }

      .social-links {
        margin-top: 40px;
      }

      .social-links h3 {
        margin-bottom: 20px;
        color: var(--text-primary);
      }

      .social-icons {
        display: flex;
        gap: 20px;
        flex-wrap: wrap;
        align-items: center;
      }

      .social-icons a {
        width: 48px;
        height: 48px;
        display: flex;
        align-items: center;
        justify-content: center;
        background: var(--bg-secondary);
        border-radius: 50%;
        border: 2px solid var(--border);
        transition: all 0.3s ease;
        text-decoration: none;
        position: relative;
        overflow: hidden;
      }

      .social-icons a:hover {
        background: var(--accent);
        border-color: var(--accent);
        transform: translateY(-5px) scale(1.05);
        box-shadow: 0 10px 25px var(--accent-glow);
      }

      .social-icons .social-icon {
        width: 24px;
        height: 24px;
        object-fit: contain;
        transition: all 0.3s ease;
      }

      [data-theme="dark"] .social-icons .social-icon {
        filter: brightness(0.9);
      }

      [data-theme="light"] .social-icons .social-icon {
        filter: brightness(0.85) contrast(1.1);
      }

      .social-icons a:hover .social-icon {
        filter: brightness(1.3) contrast(1.1);
        transform: scale(1.1);
      }

      .contact-form {
        background: var(--card-bg);
        padding: 40px;
        border-radius: 12px;
        box-shadow: 0 10px 30px var(--shadow);
        border: 1px solid var(--border);
      }

      .contact-form h2,
      .contact-form h3 {
        margin-bottom: 30px;
        color: var(--accent);
        font-weight: 700;
      }

      .form-group {
        margin-bottom: 25px;
      }

      .form-group label {
        display: block;
        margin-bottom: 8px;
        color: var(--text-primary);
        font-weight: 600;
        font-size: 0.95rem;
      }

      .form-group input,
      .form-group textarea,
      .form-group select {
        width: 100%;
        padding: 12px 16px; /* Matched to reference */
        background: var(--bg-secondary);
        border: 2px solid var(--border);
        border-radius: 8px; /* Matched to reference */
        color: var(--text-primary);
        font-size: 14px; /* Matched to reference */
        transition: all 0.3s ease;
        font-family: inherit;
      }

      .form-group select {
        appearance: auto; /* Ensure dropdown arrow is visible */
        cursor: pointer;
      }

      .form-group option {
        background-color: var(--bg-secondary);
        color: var(--text-primary);
      }

      .form-group input:focus,
      .form-group textarea:focus,
      .form-group select:focus {
        outline: none;
        border-color: var(--accent);
        box-shadow: 0 0 0 3px var(--accent-glow);
        background: var(--card-bg);
      }

      .form-group textarea {
        resize: vertical;
        height: 120px;
        min-height: 100px;
        line-height: 1.6;
      }
      .submit-button {
        width: auto;
        min-width: 180px;
        height: 48px;
        padding: 0 32px;
        border-radius: 12px;
        background: linear-gradient(135deg, var(--accent), #7c3aed);
        color: #fff;
        border: none;
        cursor: pointer;
        display: block; /* allow margin centering */
        margin: 16px auto 0; /* centered */
        position: relative;
        box-shadow: 0 10px 20px rgba(99, 102, 241, 0.35);
        transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.3s ease;
        font-size: 16px;
        font-weight: 600;
        letter-spacing: 0.5px;
      }

      .submit-button:hover {
        transform: translateY(-2px) scale(1.04);
        box-shadow: 0 14px 28px rgba(99, 102, 241, 0.4);
      }

      .submit-button:active {
        transform: translateY(0) scale(0.96);
      }

      /* Ripple highlight on click */
      .submit-button::after {
        content: "";
        position: absolute;
        inset: 0;
        border-radius: 12px;
        background: radial-gradient(circle at center, rgba(255, 255, 255, 0.45) 0%, rgba(255, 255, 255, 0) 60%);
        top: 50%;
        left: 50%;
        width: 100%;
        height: 100%;
        transform: translate(-50%, -50%) scale(0);
        opacity: 0;
        transition: transform 0.4s ease, opacity 0.4s ease;
        pointer-events: none;
      }

      .submit-button:active::after {
        transform: translate(-50%, -50%) scale(2.5);
        opacity: 1;
      }

      /* Loading state */
      .submit-button.loading {
        color: transparent; /* hide label */
        pointer-events: none;
      }

      .submit-button.loading::before {
        content: "";
        position: absolute;
        top: 50%;
        left: 50%;
        width: 24px;
        height: 24px;
        margin: -12px 0 0 -12px;
        border-radius: 50%;
        border: 3px solid rgba(255, 255, 255, 0.45);
        border-top-color: #fff;
        animation: spin 1s linear infinite;
      }

      /* Success state */
      .submit-button.success {
        background: linear-gradient(135deg, #22c55e, #16a34a);
      }

      .submit-button.success::before {
        content: "✓";
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        font-size: 20px;
        color: #fff;
        animation: fade-in 0.35s ease;
      }

      .toast {
        position: fixed;
        top: -100px;
        left: 50%;
        transform: translateX(-50%);
        background: rgba(239, 68, 68, 0.95);
        color: #ffffff;
        padding: 12px 20px;
        border-radius: 12px;
        box-shadow: 0 10px 30px rgba(239, 68, 68, 0.4);
        z-index: 2000;
        transition: top 0.35s ease, opacity 0.35s ease;
        opacity: 0;
      }
      .toast.show { top: 30px; opacity: 1; }
      [data-theme="dark"] .toast { background: rgba(239, 68, 68, 0.9); }

      /* Keyframe for spinner animation */
      @keyframes spin {
        0% {
          transform: rotate(0deg);
        }
        100% {
          transform: rotate(360deg);
        }
      }

      /* Keyframe for fade-in animation (for success/error) */
      @keyframes fade-in {
        from {
          opacity: 0;
        }
        to {
          opacity: 1;
        }
      }

      /* Footer Styles */
      footer {
        text-align: center;
        padding: 20px 10px;
        margin-top: 50px;
        color: var(--text-secondary);
        border-top: 2px solid var(--border);
        background: var(--bg-primary);
        width: 100%;
        position: relative;
      }

      footer p {
        margin: 0;
        font-size: 0.95rem;
        line-height: 1.6;
      }

      footer strong {
        color: var(--text-primary);
        font-weight: 600;
      }

      @media (max-width: 768px) {
        .content {
          grid-template-columns: 1fr;
        }

        h1 {
          font-size: 2rem;
        }

        .header {
          flex-direction: column;
          gap: 20px;
        }

        .contact-info,
        .contact-form {
          padding: 25px;
        }
        .search-input { height: 36px; }

        .social-icons {
          gap: 16px;
        }

        .social-icons a {
          width: 44px;
          height: 44px;
        }

        .social-icons .social-icon {
          width: 22px;
          height: 22px;
        }
        .theme-toggle { height: 36px; padding: 0 12px; }
        .search-input { height: 36px; }
      }

      /* Success Tick Animation */
      #successTick {
        position: fixed;
        left: 50%;
        top: 50%;
        transform: translate(-50%, -50%) scale(0.9);
        opacity: 0;
        pointer-events: none;
        z-index: 9999;
        width: 84px;
        height: 84px;
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        background: #16a34a;
        color: #ffffff;
        box-shadow: 0 12px 32px rgba(22, 163, 74, 0.35);
        transition: opacity 300ms ease, transform 300ms ease;
      }
      #successTick.show {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1);
      }
      #successTick .tick {
        font-size: 42px;
        line-height: 1;
      }

      @media (max-width: 525px) {
        body {
          padding: 16px;
        }

        h1 {
          font-size: 1.8rem;
        }

        .header {
          gap: 16px;
        }

        .nav-container {
          gap: 12px;
        }

        .search-container {
          width: 180px;
        }

        .search-input {
          padding: 7px 35px 7px 10px;
          font-size: 0.9rem;
          height: 34px;
        }

        .search-icon-img {
          width: 16px;
          height: 16px;
        }

        .theme-toggle {
          padding: 6px 12px;
          font-size: 12px;
        }

        .theme-text {
          font-size: 12px;
          display: inline-block !important;
        }

        .theme-toggle { height: 34px; padding: 0 12px; }
        .search-input { height: 34px; }

        .content {
          gap: 20px;
        }

        .contact-info,
        .contact-form {
          padding: 20px;
          border-radius: 12px;
        }
        .form-group textarea { height: 100px; }

        .contact-info h2,
        .contact-info h3,
        .contact-form h2,
        .contact-form h3 {
          font-size: 1.4rem;
          margin-bottom: 14px;
        }

        .contact-info p,
        .info-item {
          font-size: 0.9rem;
        }

        .info-item {
          padding: 12px;
        }

        .info-item i {
          font-size: 1.1rem;
        }

        .social-icons {
          gap: 12px;
          margin-top: 16px;
        }

        .social-icons a {
          width: 42px;
          height: 42px;
        }

        .social-icons .social-icon {
          width: 20px;
          height: 20px;
        }

        .form-group label {
          font-size: 0.9rem;
        }

        .form-group input,
        .form-group textarea,
        .form-group select {
          padding: 10px;
          font-size: 0.9rem;
        }

        .submit-btn {
          padding: 11px 24px;
          font-size: 0.95rem;
        }

        footer {
          padding: 20px;
          font-size: 0.85rem;
        }
      }