:root {
      --primary-color: #2c3e50;
      --secondary-color: #3498db;
      --accent-color: #e67e22;
      --success-color: #27ae60;
      --warning-color: #f39c12;
      --danger-color: #e74c3c;
      --light-bg: #ecf0f1;
      --dark-text: #2c3e50;
      --border-radius: 8px;
      --shadow: 0 2px 10px rgba(0,0,0,0.1);
      --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

    body {
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      line-height: 1.6;
      color: var(--dark-text);
      background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
      min-height: 100vh;
    }

    .container {
      max-width: 1400px;
      margin: 0 auto;
      padding: 20px;
    }

    header {
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-radius: var(--border-radius);
      padding: 20px;
      margin-bottom: 20px;
      box-shadow: var(--shadow);
      text-align: center;
    }

    .logo {
      width: 60px;
      height: 60px;
      margin-bottom: 10px;
      border-radius: 50%;
    }

    h1 {
      color: var(--primary-color);
      font-size: 2.5rem;
      font-weight: 700;
      text-shadow: 2px 2px 4px rgba(0,0,0,0.1);
    }

    .main-grid {
      display: grid;
      grid-template-columns: 1fr 2fr;
      gap: 20px;
      margin-bottom: 20px;
    }

    .controls-panel {
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-radius: var(--border-radius);
      padding: 25px;
      box-shadow: var(--shadow);
      height: fit-content;
    }

    .display-panel {
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-radius: var(--border-radius);
      padding: 25px;
      box-shadow: var(--shadow);
      min-height: 500px;
    }

    .control-group {
      margin-bottom: 20px;
    }

    .control-group label {
      display: block;
      font-weight: 600;
      margin-bottom: 8px;
      color: var(--primary-color);
    }

    select, input[type="text"], input[type="number"] {
      width: 100%;
      padding: 12px;
      border: 2px solid #ddd;
      border-radius: var(--border-radius);
      font-size: 16px;
      transition: var(--transition);
      background: white;
    }

    select:focus, input:focus {
      outline: none;
      border-color: var(--secondary-color);
      box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
    }

    .button-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 10px;
      margin-bottom: 15px;
    }

    .button-row {
      display: flex;
      gap: 10px;
      margin-bottom: 15px;
    }

    .btn {
      padding: 12px 16px;
      border: none;
      border-radius: var(--border-radius);
      font-size: 14px;
      font-weight: 600;
      cursor: pointer;
      transition: var(--transition);
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      text-decoration: none;
      color: white;
      min-height: 44px;
      position: relative;
      overflow: hidden;
    }

    .btn::before {
      content: '';
      position: absolute;
      top: 0;
      left: -100%;
      width: 100%;
      height: 100%;
      background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
      transition: left 0.5s;
    }

    .btn:hover::before {
      left: 100%;
    }

    .btn-primary {
      background: var(--secondary-color);
    }

    .btn-success {
      background: var(--success-color);
    }

    .btn-warning {
      background: var(--warning-color);
    }

    .btn-danger {
      background: var(--danger-color);
    }

    .btn:hover {
      transform: translateY(-2px);
      box-shadow: 0 4px 15px rgba(0,0,0,0.2);
    }

    .btn:active {
      transform: translateY(0);
    }

    .btn:disabled {
      opacity: 0.6;
      cursor: not-allowed;
      transform: none;
    }

    .search-container {
      position: relative;
    }

    .search-input {
      padding-left: 40px !important;
    }

    .search-icon {
      position: absolute;
      left: 12px;
      top: 50%;
      transform: translateY(-50%);
      color: #666;
      font-size: 18px;
    }

    .status-panel {
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-radius: var(--border-radius);
      padding: 20px;
      margin-bottom: 20px;
      box-shadow: var(--shadow);
    }

/* ===============================
   Status & Messages
   =============================== */
.status {
  text-align: center;
  margin-top: 1rem;
  font-size: 1.1rem;
}

    .slideshow {
      min-height: 400px;
      display: flex;
      align-items: center;
      justify-content: center;
      background: #f8f9fa;
      border-radius: var(--border-radius);
      position: relative;
      overflow: hidden;
    }

    .slideshow img {
      max-width: 100%;
      max-height: 400px;
      border-radius: var(--border-radius);
      box-shadow: var(--shadow);
      transition: var(--transition);
    }

    .slideshow .loading {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 20px;
      color: #666;
    }
/* Spinner*/
   .spinner {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: conic-gradient(#00b894, #6c5ce7, #00b894);
  animation: spin 1.2s linear infinite;
  margin: 20px auto;
  position: relative;
}

.spinner::before {
  content: "";
  position: absolute;
  top: 6px;
  left: 6px;
  right: 6px;
  bottom: 6px;
  background-color: #fff;
  border-radius: 50%;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.loading p {
  text-align: center;
  font-size: 1.1rem;
  color: #555;
  margin-top: 10px;
  animation: fadeIn 1s ease-in-out;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}


/* ===============================
   Names List + Preview Combined Layout
   =============================== */
#loadedNames {
  margin-top: 1rem;
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 1rem;
  justify-content: center;
}

#loadedNames strong {
  white-space: nowrap;
  color: #7dd3fc;
  font-size: 1.05rem;
}

#namesList {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 10px;
  padding: 5px 0;
}

.name-inline {
  display: inline-block;
  white-space: nowrap;
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 14px;
  color: #fffff;
  border: 1px solid #ccc;
  transition: all 0.3s ease;
}

/* CURRENT student */
.name-inline.current {
  background-color: #4caf50;
  color: #fff;
  border: none;
  font-weight: bold;
  box-shadow: 0 2px 6px rgba(0, 128, 0, 0.3);
}

/* PREVIOUS student */
.name-inline.previous {
  border-color: #bbb;
  color: #999;
  font-style: italic;
}

/* NEXT student */
.name-inline.next {
  border-color: #1e88e5;
  color: #1e88e5;
  font-weight: 500;
}

    .suggestion-box {
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-radius: var(--border-radius);
      padding: 20px;
      margin-top: 20px;
      box-shadow: var(--shadow);
      display: none;
    }

    .suggestion-item {
      padding: 10px 15px;
      margin: 5px 0;
      background: #f8f9fa;
      border-radius: var(--border-radius);
      cursor: pointer;
      transition: var(--transition);
      border: 2px solid transparent;
    }

    .suggestion-item:hover {
      background: var(--secondary-color);
      color: white;
      transform: translateX(5px);
    }

    .suggestion-item:first-child {
      border-color: var(--danger-color);
      font-weight: bold;
    }

    .message {
      padding: 12px 16px;
      border-radius: var(--border-radius);
      margin: 10px 0;
      font-weight: 500;
      animation: slideIn 0.3s ease-out;
    }

    @keyframes slideIn {
      from {
        opacity: 0;
        transform: translateY(-10px);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    .message.info {
      background: rgba(52, 152, 219, 0.1);
      color: var(--secondary-color);
      border-left: 4px solid var(--secondary-color);
    }

    .message.success {
      background: rgba(39, 174, 96, 0.1);
      color: var(--success-color);
      border-left: 4px solid var(--success-color);
    }

    .message.warning {
      background: rgba(243, 156, 18, 0.1);
      color: var(--warning-color);
      border-left: 4px solid var(--warning-color);
    }

    .message.error {
      background: rgba(231, 76, 60, 0.1);
      color: var(--danger-color);
      border-left: 4px solid var(--danger-color);
    }

    .quick-links {
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-radius: var(--border-radius);
      padding: 20px;
      box-shadow: var(--shadow);
      text-align: center;
    }

    .quick-links a {
      color: var(--secondary-color);
      text-decoration: none;
      font-weight: 600;
      margin: 0 10px;
      padding: 8px 12px;
      border-radius: var(--border-radius);
      transition: var(--transition);
    }

    .quick-links a:hover {
      background: var(--secondary-color);
      color: white;
    }

    footer {
      text-align: center;
      padding: 20px;
      color: rgba(255, 255, 255, 0.8);
      font-weight: 500;
    }

    .listening-indicator {
      position: fixed;
      top: 20px;
      right: 20px;
      background: var(--danger-color);
      color: white;
      padding: 10px 15px;
      border-radius: 25px;
      font-weight: bold;
      display: none;
      z-index: 1000;
      animation: pulse 1.5s infinite;
    }

    @keyframes pulse {
      0%, 100% { opacity: 1; }
      50% { opacity: 0.7; }
    }

    .voice-controls {
      display: grid;
      grid-template-columns: 1fr auto;
      gap: 10px;
      align-items: end;
    }

    .delay-control {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .delay-control input {
      width: 80px;
      margin: 0;
    }

    @media (max-width: 768px) {
      .main-grid {
        grid-template-columns: 1fr;
      }
      
      .button-grid {
        grid-template-columns: 1fr;
      }
      
      .button-row {
        flex-direction: column;
      }
      
      h1 {
        font-size: 1.8rem;
      }
      
      .voice-controls {
        grid-template-columns: 1fr;
      }
    }

    /* Enhanced animations */
    .fade-in {
      animation: fadeIn 0.5s ease-in;
    }

    @keyframes fadeIn {
      from { opacity: 0; }
      to { opacity: 1; }
    }

    .slide-up {
      animation: slideUp 0.4s ease-out;
    }

    @keyframes slideUp {
      from {
        opacity: 0;
        transform: translateY(20px);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }