:root {
      --color-primary: #FF8A00;
      --color-secondary: #6C3EF0;
      --color-accent: #00C2A8;
      --color-bg: #FFF8F0;
      --color-card: #FFFFFF;
      --color-ink: #1A1A1A;
      --color-muted: #6B7280;
    }
    
    * {
      font-family: 'Poppins', sans-serif;
    }
    
    body {
      background-color: var(--color-bg);
      color: var(--color-ink);
      padding-top: 70px;
    }

    /* Navbar Styles */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      background: rgba(255, 255, 255, 0.95);
      -webkit-backdrop-filter: blur(10px);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid rgba(0, 0, 0, 0.08);
      z-index: 1000;
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    }

    .navbar-container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 16px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .navbar-brand {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 600;
      font-size: 20px;
      color: var(--color-ink);
    }

    .navbar-logo {
      font-size: 24px;
    }

    .navbar-title {
      background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .navbar-links {
      display: flex;
      gap: 24px;
      align-items: center;
    }

    .navbar-link {
      color: var(--color-muted);
      text-decoration: none;
      font-weight: 500;
      font-size: 14px;
      transition: color 0.3s ease;
      padding: 8px 12px;
      border-radius: 8px;
    }

    .navbar-link:hover {
      color: var(--color-primary);
      background-color: rgba(255, 138, 0, 0.1);
    }
    
    .btn-primary {
      background-color: var(--color-primary);
      color: white;
      min-height: 44px;
      min-width: 44px;
    }
    
    .btn-primary:hover {
      background-color: #E67A00;
    }
    
    .btn-secondary {
      background-color: var(--color-secondary);
      color: white;
      min-height: 44px;
      min-width: 44px;
    }
    
    .btn-secondary:hover {
      background-color: #5A31D0;
    }
    
    .card {
      background-color: var(--color-card);
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
    }
    
    .countdown-bar {
      background-color: var(--color-accent);
      transition: width 1s linear;
    }
    
    .audio-meter-bar {
      background-color: var(--color-accent);
      transition: height 0.1s ease;
    }
    
    .mic-indicator {
      background-color: var(--color-secondary);
      color: white;
      transition: background-color 0.3s ease, box-shadow 0.3s ease, transform 0.3s ease;
      position: relative;
      overflow: hidden;
    }

    .mic-indicator svg {
      pointer-events: none;
    }

    .mic-indicator--idle {
      background-color: var(--color-secondary);
    }

    .mic-indicator--loading {
      background: linear-gradient(135deg, rgba(108, 62, 240, 0.95), rgba(108, 62, 240, 0.65));
      animation: pulse 1.5s infinite;
    }

    .mic-indicator--listening {
      background: linear-gradient(135deg, #22C55E, #16A34A);
      box-shadow: 0 0 0 10px rgba(34, 197, 94, 0.12);
      animation: pulse 1.2s infinite;
    }

    .mic-indicator--muted {
      background-color: var(--color-muted);
      opacity: 0.85;
    }

    .mic-indicator--error {
      background-color: #EF4444;
      animation: shake 0.6s linear infinite;
    }
    
    @keyframes pulse {
      0%, 100% { opacity: 1; }
      50% { opacity: 0.7; }
    }

    @keyframes shake {
      0%, 100% { transform: translateX(0); }
      25% { transform: translateX(-2px); }
      75% { transform: translateX(2px); }
    }
    
    .answer-btn {
      min-height: 56px;
      transition: all 0.2s;
    }
    
    .answer-btn:focus-visible {
      outline: 3px solid var(--color-secondary);
      outline-offset: 2px;
    }
    
    .answer-correct {
      background-color: #10B981;
      color: white;
    }
    
    .answer-wrong {
      background-color: #EF4444;
      color: white;
    }
    
    .hidden {
      display: none;
    }
    
    #voice-result-container {
      transition: all 0.3s ease;
      animation: pulse-fade 1.5s;
    }
    
    @keyframes pulse-fade {
      0% { opacity: 0; transform: scale(0.95); }
      20% { opacity: 1; transform: scale(1.05); }
      80% { opacity: 1; transform: scale(1); }
      100% { opacity: 0; transform: scale(0.95); }
    }

    .status-message {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      transition: color 0.3s ease;
    }

    .status-message::before {
      content: "";
      width: 10px;
      height: 10px;
      border-radius: 9999px;
      background-color: var(--color-muted);
      box-shadow: 0 0 0 0 rgba(0, 0, 0, 0.1);
      transition: background-color 0.3s ease, box-shadow 0.3s ease;
    }

    .status-message--idle::before {
      background-color: var(--color-muted);
    }

    .status-message--info::before {
      background-color: var(--color-accent);
    }

    .status-message--listening::before {
      background-color: #22C55E;
      box-shadow: 0 0 0 8px rgba(34, 197, 94, 0.15);
    }

    .status-message--warning::before {
      background-color: #FBBF24;
    }

    .status-message--error::before {
      background-color: #EF4444;
      box-shadow: 0 0 0 8px rgba(239, 68, 68, 0.12);
    }

    .status-message--success::before {
      background-color: #22C55E;
    }

    /* About Project Section Styles */
    .about-section {
      background-color: var(--color-bg);
    
      padding: 50px 20px;
    }

    .about-container {
      max-width: 1100px;
      margin: 0 auto;
    }

    .about-title {
      font-size: 28px;
      font-weight: 600;
      color: var(--color-ink);
      margin-bottom: 40px;
      text-align: center;
    }

    .about-content {
      display: grid;
      grid-template-columns: 1fr;
      gap: 24px;
    }

    .about-item {
      background: white;
      padding: 24px;
      border-radius: 16px;
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
      text-align: left;
    }

    .about-icon {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 44px;
      height: 44px;
      background-color: rgba(255, 138, 0, 0.1);
      border-radius: 10px;
      margin-bottom: 14px;
      color: var(--color-primary);
    }

    .about-subtitle {
      font-size: 17px;
      font-weight: 600;
      color: var(--color-ink);
      margin-bottom: 10px;
    }

    .about-text {
      font-size: 15px;
      line-height: 1.7;
      color: var(--color-muted);
    }

    @media (min-width: 768px) {
      .about-title {
        font-size: 32px;
      }

      .about-content {
        grid-template-columns: repeat(3, 1fr);
        gap: 20px;
      }

      .navbar-links {
        gap: 32px;
      }

      .navbar-link {
        font-size: 15px;
      }
    }

    /* Enhanced Footer Styles */
    .app-footer {
      background: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 100%);
      color: white;
      margin-top: 80px;
      padding: 50px 20px 30px;
    }

    .footer-container {
      max-width: 1100px;
      margin: 0 auto;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1fr;
      gap: 32px;
      margin-bottom: 32px;
    }

    .footer-section {
      text-align: left;
    }

    .footer-heading {
      font-size: 16px;
      font-weight: 600;
      margin-bottom: 16px;
      color: var(--color-primary);
    }

    .footer-description {
      font-size: 14px;
      line-height: 1.6;
      color: rgba(255, 255, 255, 0.7);
      max-width: 300px;
    }

    .footer-list {
      list-style: none;
      padding: 0;
      margin: 0;
    }

    .footer-list li {
      margin-bottom: 10px;
    }

    .footer-list-link {
      color: rgba(255, 255, 255, 0.7);
      text-decoration: none;
      font-size: 14px;
      transition: color 0.3s ease;
    }

    .footer-list-link:hover {
      color: var(--color-primary);
    }

    .footer-list-item {
      color: rgba(255, 255, 255, 0.7);
      font-size: 14px;
      margin-bottom: 10px;
    }

    .footer-social {
      display: flex;
      gap: 12px;
      margin-top: 12px;
    }

    .footer-social-link {
      display: flex;
      align-items: center;
      justify-content: center;
      width: 36px;
      height: 36px;
      background: rgba(255, 255, 255, 0.1);
      border-radius: 8px;
      color: white;
      transition: all 0.3s ease;
      text-decoration: none;
    }

    .footer-social-link:hover {
      background: var(--color-primary);
      transform: translateY(-2px);
    }

    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      padding-top: 24px;
      display: flex;
      flex-direction: column;
      gap: 8px;
      align-items: center;
      text-align: center;
    }

    .footer-copyright {
      font-size: 13px;
      color: rgba(255, 255, 255, 0.5);
      margin: 0;
    }

    .footer-credit {
      font-size: 13px;
      color: rgba(255, 255, 255, 0.7);
      margin: 0;
    }

    .footer-credit-link {
      color: var(--color-primary);
      text-decoration: none;
      font-weight: 600;
      transition: color 0.3s ease;
    }

    .footer-credit-link:hover {
      color: #ff9d1f;
      text-decoration: underline;
    }

    @media (min-width: 768px) {
      .footer-grid {
        grid-template-columns: 2fr 1fr 1fr 1fr;
        gap: 40px;
      }

      .footer-bottom {
        flex-direction: row;
        justify-content: space-between;
      }
    }

    /* Scroll Indicator Styles */
    .scroll-indicator {
      display: inline-flex;
      flex-direction: column;
      align-items: center;
      gap: 8px;
      color: var(--color-muted);
      cursor: pointer;
      transition: all 0.3s ease;
      margin-top: 24px;
    }

    .scroll-indicator:hover {
      color: var(--color-primary);
      transform: translateY(4px);
    }

    .scroll-indicator-text {
      font-size: 14px;
      font-weight: 500;
    }

    .scroll-arrow {
      width: 24px;
      height: 24px;
      animation: bounce 2s infinite;
    }

    @keyframes bounce {
      0%, 20%, 50%, 80%, 100% {
        transform: translateY(0);
      }
      40% {
        transform: translateY(-8px);
      }
      60% {
        transform: translateY(-4px);
      }
    }

    /* Custom Scrollbar */
    ::-webkit-scrollbar {
      width: 8px;
    }

    ::-webkit-scrollbar-track {
      background: var(--color-bg);
    }

    ::-webkit-scrollbar-thumb {
      background: var(--color-primary);
      border-radius: 4px;
    }

    ::-webkit-scrollbar-thumb:hover {
      background: #E67A00;
    }