:root {
        --bg-primary-dark: #0d0f12;
        --bg-secondary-dark: #12151a;
        --text-primary-dark: #e9ecef;
        --text-secondary-dark: #a0aec0;
        --accent-dark: #00e0e0;
        --border-color-dark: rgba(255, 255, 255, 0.1);
        --error-color-dark: #e57373;
      }
      [data-theme="dark"] {
        --bg-primary: var(--bg-primary-dark);
        --bg-secondary: var(--bg-secondary-dark);
        --text-primary: var(--text-primary-dark);
        --text-secondary: var(--text-secondary-dark);
        --accent: var(--accent-dark);
        --border-color: var(--border-color-dark);
        --error-color: var(--error-color-dark);
      }
      * {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
        -webkit-tap-highlight-color: transparent;
      }
      html {
        scroll-behavior: smooth;
      }
      body {
        font-family: var(--font-secondary, 'Montserrat', sans-serif);
        background-color: var(--bg-primary);
        color: var(--text-primary);
        line-height: 1.6;
        transition:
          background-color 0.4s ease,
          color 0.4s ease;
        display: flex;
        justify-content: center;
        align-items: flex-start;
        min-height: 100vh;
        padding: 2rem 1rem;
      }
      .main-container {
        width: 100%;
        max-width: 700px;
          padding-top: 0;
      }
      .questionnaire-container,
      .loading-container,
      .results-container {
        width: 100%;
        background: var(--bg-secondary);
        border-radius: 16px;
        border: 1px solid var(--border-color);
        padding: 2rem;
        box-shadow: 0 10px 30px -5px rgba(0, 0, 0, 0.1);
        transition: all 0.4s ease;
      }
      @media (max-width: 768px) {
        .questionnaire-container,
        .loading-container,
        .results-container {
          padding: 1.5rem;
        }
      }
      .questionnaire-header h1 {
        font-family: var(--font-primary, 'Poppins', sans-serif);
        text-align: center;
        font-size: clamp(1.8rem, 5vw, 2.5rem);
        margin-bottom: 0.5rem;
      }
      .questionnaire-header p {
        text-align: center;
        color: var(--text-secondary);
        margin-bottom: 2rem;
        font-size: 1rem;
      }
      .progress-bar-container {
        width: 100%;
        height: 8px;
        background-color: var(--bg-primary);
        border-radius: 4px;
        margin-bottom: 2rem;
        overflow: hidden;
      }
      .progress-bar-fill {
        height: 100%;
        width: 0%;
        background-color: var(--accent);
        border-radius: 4px;
        transition: width 0.5s ease;
      }
      .form-step {
        display: none;
        animation: fadeIn 0.5s ease-in-out;
      }
      .form-step.active {
        display: block;
      }
      @keyframes fadeIn {
        from {
          opacity: 0;
          transform: translateY(10px);
        }
        to {
          opacity: 1;
          transform: translateY(0);
        }
      }
      .step-title {
        font-family: "Plus Jakarta Sans", sans-serif;
        font-weight: 700;
        font-size: 1.4rem;
        margin-bottom: 1.5rem;
        color: var(--text-primary);
        border-left: 3px solid var(--accent);
        padding-left: 1rem;
      }
      .form-group {
        margin-bottom: 1.5rem;
      }
      .form-group > label {
        display: block;
        margin-bottom: 0.5rem;
        font-weight: 600;
        color: var(--text-secondary);
        font-size: 0.9rem;
      }
      .form-group input[type="text"],
      .form-group input[type="number"],
      .form-group input[type="email"],
      .form-group input[type="tel"],
      .form-group textarea {
        width: 100%;
        padding: 0.75rem 1rem;
        border: 1px solid var(--border-color);
        background-color: var(--bg-primary);
        border-radius: 8px;
        color: var(--text-primary);
        font-family: "Plus Jakarta Sans", sans-serif;
        font-size: 1rem;
        transition: border-color 0.3s ease;
      }
      .form-group input:focus,
      .form-group textarea:focus {
        outline: none;
        border-color: var(--accent);
      }
      .form-group textarea {
        min-height: 120px;
        resize: vertical;
      }
      .form-group .input-error {
        border-color: var(--error-color);
      }
      .form-group .error-message {
        display: none;
        color: var(--error-color);
        font-size: 0.8rem;
        font-weight: 500;
        margin-top: 0.35rem;
      }
      .choice-group {
        display: flex;
        flex-direction: column;
        gap: 0.75rem;
      }
      .choice-item {
        display: flex;
        align-items: center;
        background-color: var(--bg-primary);
        padding: 0.75rem 1rem;
        border-radius: 8px;
        border: 1px solid var(--border-color);
        cursor: pointer;
        transition: all 0.3s ease;
      }
      .choice-item:hover {
        border-color: var(--accent);
      }
      .choice-item input {
        display: none;
      }
      .choice-item .checkmark {
        width: 20px;
        height: 20px;
        border: 2px solid var(--text-secondary);
        border-radius: 50%;
        margin-right: 1rem;
        display: flex;
        justify-content: center;
        align-items: center;
        transition: all 0.3s ease;
        flex-shrink: 0;
      }
      .choice-item input[type="checkbox"] + .checkmark {
        border-radius: 4px;
      }
      .choice-item .checkmark::after {
        content: "";
        display: block;
        width: 10px;
        height: 10px;
        background-color: var(--accent);
        border-radius: 50%;
        transform: scale(0);
        transition: transform 0.3s ease;
      }
      .choice-item input[type="checkbox"] + .checkmark::after {
        width: 5px;
        height: 10px;
        border-radius: 0;
        background-color: transparent;
        border: solid var(--accent);
        border-width: 0 3px 3px 0;
        transform: rotate(45deg) scale(0);
      }
      .choice-item input:checked + .checkmark {
        border-color: var(--accent);
      }
      .choice-item input:checked + .checkmark::after {
        transform: scale(1);
      }
      .choice-item input[type="checkbox"]:checked + .checkmark::after {
        transform: rotate(45deg) scale(1);
      }
      .choice-item .choice-label {
        margin: 0;
        font-weight: 500;
        color: var(--text-primary);
      }
      .navigation-buttons {
        display: flex;
        justify-content: center;
        gap: 0.5rem;
        margin-top: 1rem;
      }
      .nav-btn {
        padding: 0.5rem 1rem;
        border: none;
        border-radius: 6px;
        font-family: "Plus Jakarta Sans", sans-serif;
        font-size: 1rem;
        font-weight: 600;
        cursor: pointer;
        transition: all 0.3s ease;
      }
      .nav-btn#back-btn {
        background-color: transparent;
        color: var(--text-secondary);
        border: 1px solid var(--border-color);
      }
      .nav-btn#back-btn:hover {
        background-color: var(--bg-primary);
        border-color: var(--accent);
        color: var(--accent);
      }
      .nav-btn#next-btn {
        background-color: var(--accent);
        color: var(--bg-primary);
      }
      [data-theme="dark"] .nav-btn#next-btn {
        color: #000;
      }
      .nav-btn#next-btn:hover {
        transform: translateY(-2px);
        box-shadow: 0 4px 15px -5px var(--accent);
      }
      .nav-btn:disabled {
        opacity: 0.5;
        cursor: not-allowed;
        background-color: var(--text-secondary);
      }
      .hidden {
        display: none !important;
      }
      .loading-container {
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        min-height: 400px;
        text-align: center;
      }
      .loading-animation {
        width: 80px;
        height: 80px;
        position: relative;
        margin-bottom: 2rem;
      }
      .loading-animation::before,
      .loading-animation::after {
        content: "";
        position: absolute;
        border: 4px solid var(--accent);
        border-radius: 50%;
        width: 100%;
        height: 100%;
        animation: pulse 1.5s cubic-bezier(0.65, 0, 0.35, 1) infinite;
      }
      .loading-animation::after {
        animation-delay: -0.75s;
      }
      @keyframes pulse {
        0% {
          transform: scale(0.1);
          opacity: 1;
        }
        100% {
          transform: scale(1);
          opacity: 0;
        }
      }
      .loading-container h2 {
        font-family: "Playfair Display", serif;
        margin-bottom: 0.5rem;
      }
      .loading-container p {
        color: var(--text-secondary);
      }
      .results-container {
        animation: fadeIn 0.8s ease-out;
      }
      .results-header {
        text-align: center;
        margin-bottom: 2.5rem;
      }
      .results-header h1 {
        font-family: "Playfair Display", serif;
        font-size: clamp(2rem, 6vw, 2.8rem);
      }
      .results-header p {
        font-size: 1.1rem;
        color: var(--text-secondary);
        margin-top: 0.5rem;
      }
      .result-card {
        background: var(--bg-primary);
        border: 1px solid var(--border-color);
        border-left: 4px solid var(--accent);
        border-radius: 12px;
        padding: 1.5rem;
        margin-bottom: 1.5rem;
        opacity: 0;
        transform: translateY(20px);
        animation: slideUpFadeIn 0.6s ease-out forwards;
      }
      @keyframes slideUpFadeIn {
        to {
          opacity: 1;
          transform: translateY(0);
        }
      }
      .result-card h3 {
        font-size: 1rem;
        font-weight: 700;
        color: var(--accent);
        text-transform: uppercase;
        letter-spacing: 1px;
        margin-bottom: 1rem;
      }
      .result-card p,
      .result-card ul {
        font-size: 1rem;
        color: var(--text-secondary);
      }
      .result-card strong {
        color: var(--text-primary);
        font-weight: 600;
      }
      .result-card ul {
        list-style: none;
        padding-left: 0;
      }
      .result-card ul li {
        padding-left: 1.5rem;
        position: relative;
        margin-bottom: 0.5rem;
      }
      .result-card ul li::before {
        content: "✓";
        color: var(--accent);
        font-weight: 700;
        position: absolute;
        left: 0;
        top: 1px;
      }
      #protocol-details {
        white-space: pre-wrap;
      }
      .disclaimer {
        font-size: 0.8rem;
        text-align: center;
        color: var(--text-secondary);
        margin-top: 2rem;
        padding: 1rem;
        background: var(--bg-primary);
        border-radius: 8px;
      }
      #reset-btn {
        display: block;
        margin: 2rem auto 0 auto;
        width: 100%;
        max-width: 250px;
      }
      }
      #form-error-container {
        border-left-color: var(--error-color);
        margin-top: 2rem;
      }
      #form-error-container h3 {
        color: var(--error-color);
      }

      /* --- НОВИ СТИЛОВЕ ЗА КАРТАТА С РЕЗУЛТАТИ --- */
      #products-list .product-result-card {
        background-color: var(--bg-primary);
        border: 1px solid var(--border-color);
        border-radius: 12px;
        padding: 1.5rem;
        margin-bottom: 2rem;
        display: flex;
        flex-direction: column;
        gap: 1.5rem;
        opacity: 0;
        transform: translateY(20px);
        animation: slideUpFadeIn 0.6s ease-out forwards;
      }
      #products-list .product-result-card:hover {
        box-shadow: 0 0 20px var(--accent);
      }

      .product-header {
        display: flex;
        gap: 1.5rem;
        align-items: center;
      }
      .product-header img {
        width: 80px;
        height: 80px;
        object-fit: cover;
        border-radius: 8px;
        border: 1px solid var(--border-color);
        background-color: white; /* за PNG с прозрачност */
      }
      .product-header .product-title h2 {
        font-family: "Playfair Display", serif;
        font-size: 1.5rem;
        margin: 0;
        color: var(--text-primary);
      }
      .product-header .product-title .tagline {
        font-size: 1rem;
        color: var(--text-secondary);
        font-style: italic;
        margin: 0.25rem 0 0 0;
      }
      .ai-reason {
        border-left: 3px solid var(--accent);
        padding-left: 1rem;
      }
      .ai-reason h3,
      .effects-section h3,
      .variants-section h3 {
        font-size: 0.9rem;
        text-transform: uppercase;
        letter-spacing: 0.5px;
        color: var(--accent);
        font-weight: 700;
        margin-bottom: 0.75rem;
      }
      .ai-reason p {
        color: var(--text-secondary);
        font-size: 1rem;
        margin: 0;
      }
      .effect-bar-container {
        margin-bottom: 0.5rem;
      }
      .effect-bar-container .effect-label {
        display: block;
        font-size: 0.9rem;
        color: var(--text-secondary);
        margin-bottom: 0.25rem;
      }
      .effect-bar-background {
        height: 8px;
        width: 100%;
        background-color: var(--border-color);
        border-radius: 4px;
        overflow: hidden;
      }
      .effect-bar-fill {
        height: 100%;
        background-color: var(--accent);
        border-radius: 4px;
        transition: width 0.8s ease-out;
      }
      .variants-section ul {
        list-style: none;
        padding: 0;
      }
      .variants-section ul li a {
        display: block;
        padding: 0.75rem 1rem;
        background-color: var(--bg-primary);
        border: 1px solid var(--border-color);
        border-radius: 8px;
        text-decoration: none;
        color: var(--text-primary);
        font-weight: 500;
        margin-bottom: 0.5rem;
        transition: all 0.2s ease-in-out;
      }
      .variants-section ul li a:hover {
        border-color: var(--accent);
        color: var(--accent);
        transform: translateX(4px);
      }
      .research-link-container {
        text-align: right;
        margin-top: -1rem;
      }
      .research-link-container a {
        font-size: 0.85rem;
        color: var(--text-secondary);
        text-decoration: none;
        border-bottom: 1px dashed var(--text-secondary);
        transition:
          color 0.2s,
          border-color 0.2s;
      }
      .research-link-container a:hover {
        color: var(--accent);
        border-color: var(--accent);
      }

      body.nav-open {
        overflow: hidden;
      }

      .menu-toggle { display: none; width: 30px; height: 22px; flex-direction: column; justify-content: space-between; background: none; border: none; cursor: pointer; z-index: 101; }
      .menu-toggle span { display: block; width: 100%; height: 2px; background-color: var(--text-primary); border-radius: 2px; transition: transform 0.3s ease, opacity 0.3s ease; }
      .menu-toggle.active span:nth-child(1) { transform: translateY(10px) rotate(45deg); }
      .menu-toggle.active span:nth-child(2) { opacity: 0; }
      .menu-toggle.active span:nth-child(3) { transform: translateY(-10px) rotate(-45deg); }
      .nav-overlay { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.5); opacity: 0; visibility: hidden; transition: opacity 0.4s ease, visibility 0.4s ease; z-index: 98; }
      .nav-overlay.active { opacity: 1; visibility: visible; }

      @media (max-width: 992px) {
        .nav-links {
          position: fixed; top: 0; right: -100%; width: 280px; height: 100vh;
          background: var(--bg-secondary); flex-direction: column; justify-content: center;
          align-items: center; gap: 2rem; transition: right 0.4s cubic-bezier(0.23, 1, 0.32, 1); z-index: 99;
        }
        .nav-links.active { right: 0; }
        .nav-links li { text-align: center; }
        .nav-links a { font-size: 1.2rem; }
        .menu-toggle { display: flex; }
      }