/* CSS Variables */

      [data-theme="dark"] {
        --background: #1f2937;
        --text-color: #f9fafb;
        --text-muted: #d1d5db;
        --border-color: #374151;
        --card-bg: #374151;
      }

      /* Base Styles */
      
      @media (max-width: 768px) {
        body {
          padding-top: 70px; /* Smaller header on mobile */
        }
      }

      .container {
        max-width: 1200px;
        margin: 0 auto;
        padding: 0 1rem;
      }

      .section {
        padding: 4rem 0;
        position: relative;
      }

      .section-title {
        font-family: 'Poppins', sans-serif;
        font-size: 2.5rem;
        font-weight: 700;
        margin-bottom: 1rem;
        color: var(--text-primary);
        text-align: center;
        background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
      }

      .section-subtitle {
        text-align: center;
        color: var(--text-secondary);
        margin-bottom: 3rem;
        font-size: 1.1rem;
        max-width: 700px;
        margin-left: auto;
        margin-right: auto;
      }

      /* Eiken Hero Section */
      .eiken-hero {
        min-height: calc(100vh - 80px);
        display: flex;
        align-items: center;
        position: relative;
        overflow: hidden;
        background: linear-gradient(135deg, rgba(70, 187, 229, 0.1), rgba(16, 185, 129, 0.1));
      }

      .eiken-hero .hero-bg {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        object-fit: cover;
        z-index: 0;
      }

      .eiken-hero::after {
        content: "";
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: linear-gradient(
          135deg,
          rgba(255, 255, 255, 0.85) 0%,
          rgba(249, 250, 251, 0.8) 50%,
          rgba(255, 255, 255, 0.75) 100%
        );
        z-index: 1;
      }

      .eiken-hero .hero-content {
        text-align: center;
        position: relative;
        z-index: 2;
        max-width: 900px;
        margin: 0 auto;
        padding: 2rem;
      }

      /* Hero Badge */
      .hero-badge {
        display: inline-flex;
        align-items: center;
        gap: 0.5rem;
        background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
        color: white;
        padding: 0.6rem 1.25rem;
        border-radius: 50px;
        font-size: 0.9rem;
        font-weight: 600;
        margin-bottom: 1.5rem;
        box-shadow: 0 4px 15px rgba(70, 187, 229, 0.3);
      }

      .hero-badge i {
        font-size: 1rem;
      }

      /* Hero Title */
      .hero-title {
        font-family: 'Poppins', sans-serif;
        font-size: clamp(2.5rem, 5vw, 3.5rem);
        font-weight: 800;
        margin-bottom: 1.5rem;
        background: linear-gradient(135deg, #46bbe5 0%, #2d9cdb 50%, #10b981 100%);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
        line-height: 1.2;
      }

      /* Hero Subtitle */
      .hero-subtitle {
        font-size: clamp(1rem, 2vw, 1.25rem);
        color: var(--text-secondary);
        max-width: 700px;
        margin: 0 auto 2rem;
        line-height: 1.7;
      }

      /* Hero Stats */
      .hero-stats {
        display: flex;
        justify-content: center;
        gap: 2rem;
        flex-wrap: wrap;
        margin: 2.5rem 0;
      }

      .stat-item {
        text-align: center;
        padding: 1rem;
        background: rgba(255, 255, 255, 0.8);
        border-radius: 16px;
        box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
        min-width: 140px;
        backdrop-filter: blur(10px);
        border: 1px solid rgba(255, 255, 255, 0.5);
      }

      .stat-icon {
        width: 40px;
        height: 40px;
        background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
        border-radius: 12px;
        display: flex;
        align-items: center;
        justify-content: center;
        margin: 0 auto 0.75rem;
      }

      .stat-icon i {
        color: white;
        font-size: 1.1rem;
      }

      .stat-number {
        font-size: 1.5rem;
        font-weight: 700;
        color: var(--text-primary);
        display: block;
        margin-bottom: 0.25rem;
      }

      .stat-label {
        font-size: 0.8rem;
        color: var(--text-secondary);
        text-transform: uppercase;
        letter-spacing: 0.5px;
        font-weight: 500;
      }

      .hero-cta {
        display: flex;
        gap: 1rem;
        justify-content: center;
        flex-wrap: wrap;
        margin-top: 2.5rem;
      }

      .btn-primary {
        background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
        color: white;
        padding: 1rem 2.5rem;
        border-radius: 50px;
        font-weight: 600;
        text-decoration: none;
        display: inline-flex;
        align-items: center;
        gap: 0.75rem;
        transition: all 0.3s ease;
        box-shadow: 0 4px 15px rgba(70, 187, 229, 0.3);
        border: none;
        cursor: pointer;
        font-size: 1.05rem;
      }

      .btn-primary:hover {
        transform: translateY(-3px);
        box-shadow: 0 6px 20px rgba(70, 187, 229, 0.4);
      }

      .btn-secondary {
        background: rgba(255, 255, 255, 0.9);
        backdrop-filter: blur(10px);
        color: var(--text-primary);
        padding: 1rem 2.5rem;
        border-radius: 50px;
        font-weight: 600;
        text-decoration: none;
        display: inline-flex;
        align-items: center;
        gap: 0.75rem;
        transition: all 0.3s ease;
        border: 2px solid var(--border-light);
        font-size: 1.05rem;
        box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
      }

      .btn-secondary:hover {
        background: white;
        transform: translateY(-3px);
        border-color: var(--primary-color);
        box-shadow: 0 6px 20px rgba(0, 0, 0, 0.1);
      }

      /* Quick Navigation Bar - Remove sticky behavior */
      .quick-navigation-bar {
        background: var(--bg-card);
        border-bottom: 1px solid var(--border-light);
        padding: 1.5rem 0;
        /* Remove sticky positioning */
        position: relative;
        top: auto;
        z-index: auto;
        box-shadow: none;
      }

      .quick-nav {
        display: flex;
        justify-content: center;
        gap: 0.5rem;
        flex-wrap: wrap;
      }

      .quick-nav-item {
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 0.25rem;
        padding: 0.75rem 1.25rem;
        background: var(--bg-tertiary);
        border-radius: 12px;
        color: var(--text-primary);
        text-decoration: none;
        transition: all 0.3s ease;
        border: 2px solid transparent;
        min-width: 90px;
        text-align: center;
      }

      .quick-nav-item:hover {
        background: var(--primary-light);
        border-color: var(--primary-color);
        color: var(--primary-color);
        transform: translateY(-2px);
        box-shadow: 0 4px 12px rgba(70, 187, 229, 0.2);
      }

      .quick-nav-item i {
        font-size: 1.25rem;
      }

      .quick-nav-item span {
        font-size: 0.85rem;
        font-weight: 500;
      }

      /* ===== Eiken Levels Grid - Clean, Stylish Design ===== */
      .eiken-levels-grid {
        background: var(--bg-secondary);
        padding: 5rem 0;
      }

      .levels-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
        gap: 2rem;
        margin-top: 3rem;
      }

      .level-card {
        background: var(--bg-card);
        border: 2px solid var(--border-light);
        border-radius: 24px;
        padding: 2rem;
        text-decoration: none;
        color: var(--text-primary);
        transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        display: flex;
        flex-direction: column;
        position: relative;
        overflow: hidden;
      }

      .level-card::before {
        content: "";
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        height: 6px;
        transition: height 0.3s ease;
      }

      .level-card:hover {
        transform: translateY(-10px);
        box-shadow: 0 20px 50px rgba(0, 0, 0, 0.15);
        border-color: transparent;
      }

      .level-card:hover::before {
        height: 8px;
      }

      /* Level Color Coding */
      .level-beginner::before { background: linear-gradient(135deg, #10b981, #059669); }
      .level-beginner:hover { border-color: #10b981; }
      .level-beginner .level-number { background: linear-gradient(135deg, #10b981, #059669); }

      .level-elementary::before { background: linear-gradient(135deg, #06b6d4, #0891b2); }
      .level-elementary:hover { border-color: #06b6d4; }
      .level-elementary .level-number { background: linear-gradient(135deg, #06b6d4, #0891b2); }

      .level-basic::before { background: linear-gradient(135deg, #3b82f6, #2563eb); }
      .level-basic:hover { border-color: #3b82f6; }
      .level-basic .level-number { background: linear-gradient(135deg, #3b82f6, #2563eb); }

      .level-pre-intermediate::before { background: linear-gradient(135deg, #8b5cf6, #7c3aed); }
      .level-pre-intermediate:hover { border-color: #8b5cf6; }
      .level-pre-intermediate .level-number { background: linear-gradient(135deg, #8b5cf6, #7c3aed); }

      .level-intermediate::before { background: linear-gradient(135deg, #f59e0b, #d97706); }
      .level-intermediate:hover { border-color: #f59e0b; }
      .level-intermediate .level-number { background: linear-gradient(135deg, #f59e0b, #d97706); }

      .level-upper-intermediate::before { background: linear-gradient(135deg, #ec4899, #db2777); }
      .level-upper-intermediate:hover { border-color: #ec4899; }
      .level-upper-intermediate .level-number { background: linear-gradient(135deg, #ec4899, #db2777); }

      .level-advanced::before { background: linear-gradient(135deg, #ef4444, #dc2626); }
      .level-advanced:hover { border-color: #ef4444; }
      .level-advanced .level-number { background: linear-gradient(135deg, #ef4444, #dc2626); }

      .level-badge {
        position: absolute;
        top: 1.5rem;
        right: 1.5rem;
        background: var(--bg-tertiary);
        color: var(--text-secondary);
        padding: 0.4rem 0.9rem;
        border-radius: 20px;
        font-size: 0.75rem;
        font-weight: 600;
        text-transform: uppercase;
        letter-spacing: 0.5px;
      }

      .level-header {
        display: flex;
        align-items: center;
        gap: 1rem;
        margin-bottom: 1.25rem;
      }

      .level-number {
        width: 60px;
        height: 60px;
        border-radius: 16px;
        display: flex;
        align-items: center;
        justify-content: center;
        color: white;
        font-size: 1.5rem;
        font-weight: 800;
        font-family: 'Poppins', sans-serif;
        flex-shrink: 0;
      }

      .level-header h3 {
        font-size: 1.5rem;
        font-weight: 700;
        margin: 0;
        font-family: 'Poppins', sans-serif;
        color: var(--text-primary);
      }

      .level-details-quick {
        display: flex;
        flex-wrap: wrap;
        gap: 0.75rem;
        margin-bottom: 1rem;
      }

      .level-details-quick p {
        margin: 0;
        font-size: 0.85rem;
        color: var(--text-secondary);
        display: flex;
        align-items: center;
        gap: 0.4rem;
        background: var(--bg-tertiary);
        padding: 0.4rem 0.8rem;
        border-radius: 8px;
      }

      .level-details-quick i {
        color: var(--primary-color);
        font-size: 0.8rem;
      }

      .level-description {
        color: var(--text-secondary);
        font-size: 0.95rem;
        line-height: 1.6;
        flex-grow: 1;
        margin-bottom: 1.5rem;
      }

      .level-cta {
        display: inline-flex;
        align-items: center;
        gap: 0.5rem;
        color: var(--primary-color);
        font-weight: 600;
        font-size: 1rem;
        transition: all 0.3s ease;
      }

      .level-card:hover .level-cta {
        gap: 0.75rem;
      }

      .level-card:hover .level-cta i {
        transform: translateX(4px);
      }

      .level-cta i {
        transition: transform 0.3s ease;
      }

      /* Responsive for levels grid */
      @media (max-width: 768px) {
        .levels-grid {
          grid-template-columns: 1fr;
          gap: 1.5rem;
        }

        .level-card {
          padding: 1.75rem;
        }

        .level-number {
          width: 50px;
          height: 50px;
          font-size: 1.25rem;
        }

        .level-header h3 {
          font-size: 1.3rem;
        }
      }

      /* Hero Section */
      .resources-hero {
        background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
        color: white;
        padding: 4rem 1rem;
        text-align: center;
      }

      .resources-hero h1 {
        font-size: 2.5rem;
        margin-bottom: 1rem;
        font-weight: 700;
      }

      .resources-hero p {
        font-size: 1.2rem;
        margin-bottom: 2rem;
        opacity: 0.9;
        max-width: 600px;
        margin-left: auto;
        margin-right: auto;
      }

      .hero-actions {
        display: flex;
        gap: 1rem;
        justify-content: center;
        align-items: center;
        margin-bottom: 3rem;
        flex-wrap: wrap;
      }

      .btn-outline.btn-outline {
        background: transparent;
        color: white;
        border: 2px solid white;
      }

      .btn-outline.btn-outline:hover {
        background: white;
        color: var(--primary-color);
      }

      .quick-nav {
        display: flex;
        justify-content: center;
        gap: 1rem;
        flex-wrap: wrap;
        margin-top: 2rem;
      }

      .quick-nav-item {
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 0.5rem;
        padding: 1rem;
        background: rgba(255, 255, 255, 0.1);
        border-radius: 0.75rem;
        color: white;
        text-decoration: none;
        transition: all var(--transition);
        backdrop-filter: blur(10px);
        border: 1px solid rgba(255, 255, 255, 0.2);
        min-width: 80px;
      }

      .quick-nav-item:hover {
        background: rgba(255, 255, 255, 0.2);
        transform: translateY(-3px);
        box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
      }

      .quick-nav-item i {
        font-size: 1.2rem;
      }

      .quick-nav-item span {
        font-size: 0.8rem;
        font-weight: 500;
      }

      /* Buttons */
      .btn {
        background: var(--primary-color);
        color: white;
        padding: 0.75rem 2rem;
        border: none;
        border-radius: 0.5rem;
        text-decoration: none;
        display: inline-flex;
        align-items: center;
        gap: 0.5rem;
        transition: var(--transition);
        cursor: pointer;
        font-weight: 500;
      }

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

      .btn-outline {
        background: transparent;
        color: var(--primary-color);
        border: 2px solid var(--primary-color);
        padding: 0.5rem 1.5rem;
      }

      .btn-outline:hover {
        background: var(--primary-color);
        color: white;
      }

      /* Breadcrumb */
      .breadcrumb {
        padding: 1rem 0;
        font-size: 0.9rem;
        color: var(--text-muted);
      }

      .breadcrumb a {
        color: var(--primary-color);
        text-decoration: none;
      }

      .breadcrumb a:hover {
        text-decoration: underline;
      }

      .breadcrumb span {
        margin: 0 0.5rem;
      }

      /* Cards */
      .section-card,
      .resource-card,
      .test-card {
        background: var(--bg-card);
        border: 2px solid var(--border-light);
        border-radius: 20px;
        padding: 2rem;
        text-align: center;
        transition: all 0.3s ease;
        height: 100%;
        display: flex;
        flex-direction: column;
        box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
        position: relative;
        overflow: hidden;
      }

      .section-card::before,
      .resource-card::before,
      .test-card::before {
        content: "";
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        height: 4px;
        background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
        transform: scaleX(0);
        transition: transform 0.3s ease;
      }

      .section-card:hover::before,
      .resource-card:hover::before,
      .test-card:hover::before {
        transform: scaleX(1);
      }

      .section-card:hover,
      .resource-card:hover,
      .test-card:hover {
        transform: translateY(-8px);
        box-shadow: 0 12px 35px rgba(70, 187, 229, 0.2);
        border-color: var(--primary-color);
      }

      .sections-grid,
      .resources-cards,
      .test-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        gap: 2rem;
        margin-top: 3rem;
      }

      .section-icon,
      .test-icon {
        font-size: 2.5rem;
        color: var(--primary-color);
        margin-bottom: 1.5rem;
        background: var(--primary-light);
        width: 80px;
        height: 80px;
        display: flex;
        align-items: center;
        justify-content: center;
        border-radius: 20px;
        margin-left: auto;
        margin-right: auto;
      }

      .section-card h3,
      .resource-card h3,
      .test-card h3 {
        color: var(--text-primary);
        margin-bottom: 1rem;
        font-size: 1.4rem;
        font-weight: 700;
        font-family: 'Poppins', sans-serif;
      }

      .section-card p,
      .resource-card p,
      .test-card p {
        color: var(--text-secondary);
        flex-grow: 1;
        margin-bottom: 1.5rem;
        line-height: 1.6;
      }

      /* Resource Cards Specific */
      .resource-card {
        position: relative;
        padding-top: 180px;
      }

      .resource-image {
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        height: 180px;
        object-fit: cover;
        border-radius: 18px 18px 0 0;
      }

      .resource-content {
        padding: 1.5rem 1rem 1rem;
      }

      .badge {
        position: absolute;
        top: 12px;
        right: 12px;
        padding: 0.5rem 1rem;
        border-radius: 20px;
        font-size: 0.75rem;
        font-weight: 700;
        text-transform: uppercase;
        letter-spacing: 0.5px;
        z-index: 1;
      }

      .badge-free {
        background: var(--success-color);
        color: white;
      }

      .badge-premium {
        background: linear-gradient(135deg, #f59e0b, #d97706);
        color: white;
        box-shadow: 0 4px 10px rgba(245, 158, 11, 0.3);
      }

      /* Calculator */
      .calculator-section {
        background: var(--card-bg);
        border: 1px solid var(--border-color);
        border-radius: 0.5rem;
        padding: 2rem;
        margin-top: 2rem;
        text-align: center;
      }

      .form-group {
        margin-bottom: 1.5rem;
        text-align: left;
      }

      .form-group label {
        display: block;
        margin-bottom: 0.5rem;
        font-weight: 500;
        color: var(--text-color);
      }

      .form-control {
        width: 100%;
        padding: 0.75rem;
        border: 1px solid var(--border-color);
        border-radius: 0.25rem;
        background: var(--background);
        color: var(--text-color);
        font-size: 1rem;
      }

      .form-control:focus {
        outline: none;
        border-color: var(--primary-color);
        box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
      }

      .calc-result {
        margin-top: 1.5rem;
        padding: 1.5rem;
        background: rgba(79, 70, 229, 0.1);
        border-radius: 0.5rem;
        text-align: center;
      }

      .result-score {
        font-size: 1.5rem;
        font-weight: bold;
        color: var(--primary-color);
        margin-bottom: 0.5rem;
      }

      /* Tab Navigation */
      .tab-navigation {
        display: flex;
        flex-wrap: wrap;
        gap: 0.5rem;
        margin-bottom: 2.5rem;
        background: var(--bg-card);
        padding: 0.75rem;
        border-radius: 16px;
        justify-content: center;
        border: 2px solid var(--border-light);
        box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
      }

      .tab-button {
        background: transparent;
        border: none;
        padding: 0.875rem 1.5rem;
        border-radius: 12px;
        color: var(--text-secondary);
        cursor: pointer;
        transition: all 0.3s ease;
        font-weight: 600;
        font-size: 0.95rem;
        position: relative;
      }

      .tab-button:hover {
        color: var(--primary-color);
        background: var(--primary-light);
        transform: translateY(-2px);
      }

      .tab-button.active {
        background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
        color: white;
        box-shadow: 0 4px 15px rgba(70, 187, 229, 0.3);
        transform: translateY(-2px);
      }

      .tab-pane {
        display: none;
        animation: fadeIn 0.3s ease-in;
      }

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

      .tab-pane.active {
        display: block;
      }

      .level-content {
        display: grid;
        grid-template-columns: 2fr 1fr;
        gap: 2.5rem;
        align-items: start;
      }

      @media (max-width: 968px) {
        .level-content {
          grid-template-columns: 1fr;
        }
      }

      .level-info {
        background: var(--bg-card);
        padding: 2.5rem;
        border-radius: 20px;
        border: 2px solid var(--border-light);
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
        transition: all 0.3s ease;
      }

      .level-info:hover {
        transform: translateY(-5px);
        box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
      }

      .level-info h3 {
        color: var(--text-primary);
        margin-bottom: 1.25rem;
        font-size: 1.75rem;
        font-weight: 700;
        background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
      }

      .level-info p {
        color: var(--text-secondary);
        margin-bottom: 1.5rem;
        line-height: 1.7;
        font-size: 1.05rem;
      }

      .level-details {
        list-style: none;
        padding: 0;
        margin: 1.5rem 0;
        background: var(--bg-tertiary);
        padding: 1.5rem;
        border-radius: 12px;
      }

      .level-details li {
        padding: 0.75rem 0;
        border-bottom: 1px solid var(--border-light);
        color: var(--text-secondary);
        display: flex;
        align-items: center;
        gap: 0.5rem;
        font-size: 0.95rem;
      }

      .level-details li:last-child {
        border-bottom: none;
      }

      .level-details li:before {
        content: "\f00c";
        font-family: "Font Awesome 6 Free";
        font-weight: 900;
        color: var(--success-color);
        font-size: 0.85rem;
      }

      .level-details strong {
        color: var(--text-primary);
        font-weight: 600;
      }

      .level-image {
        position: sticky;
        top: 100px;
      }

      .level-image img {
        width: 100%;
        border-radius: 16px;
        box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
        transition: all 0.3s ease;
      }

      .level-image img:hover {
        transform: scale(1.03);
        box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
      }
        border: 1px solid var(--border-color);
      }

      /* Accordion - Tips & Mistakes */
      .tips-accordion,
      .mistakes-accordion {
        max-width: 900px;
        margin: 0 auto;
      }

      .accordion-item,
      .mistake-item {
        background: var(--bg-card);
        border: 2px solid var(--border-light);
        border-radius: 16px;
        margin-bottom: 1.5rem;
        overflow: hidden;
        transition: all 0.3s ease;
      }

      .accordion-item:hover,
      .mistake-item:hover {
        border-color: var(--primary-color);
        box-shadow: 0 4px 20px rgba(70, 187, 229, 0.15);
      }

      .accordion-header,
      .mistake-header {
        padding: 1.5rem 2rem;
        cursor: pointer;
        display: flex;
        justify-content: space-between;
        align-items: center;
        gap: 1rem;
        transition: all 0.3s ease;
        background: linear-gradient(135deg, transparent, var(--bg-tertiary));
      }

      .accordion-header:hover,
      .mistake-header:hover {
        background: var(--primary-light);
      }

      .accordion-header h3,
      .mistake-header h3 {
        margin: 0;
        color: var(--text-primary);
        font-size: 1.25rem;
        font-weight: 600;
        display: flex;
        align-items: center;
        gap: 1rem;
        flex: 1;
      }

      .mistake-icon {
        width: 45px;
        height: 45px;
        display: flex;
        align-items: center;
        justify-content: center;
        border-radius: 50%;
        background: var(--error-color);
        color: white;
        font-size: 1.2rem;
      }

      .accordion-icon {
        color: var(--primary-color);
        transition: transform 0.3s ease;
        font-size: 1.25rem;
        flex-shrink: 0;
      }

      .accordion-content,
      .mistake-content {
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.4s ease;
      }

      .accordion-item.active .accordion-content,
      .mistake-item.active .mistake-content {
        max-height: 800px;
      }

      .accordion-item.active .accordion-icon,
      .mistake-item.active .accordion-icon {
        transform: rotate(180deg);
      }

      .accordion-inner,
      .mistake-inner {
        padding: 2rem;
        background: var(--bg-secondary);
      }

      .accordion-inner p,
      .mistake-inner p {
        margin-bottom: 1rem;
        line-height: 1.7;
        color: var(--text-secondary);
      }

      .accordion-inner strong {
        color: var(--primary-color);
        font-weight: 600;
      }

      .mistake-example {
        background: var(--bg-card);
        padding: 1.5rem;
        border-radius: 12px;
        margin-bottom: 1.5rem;
        border-left: 4px solid var(--error-color);
      }

      .mistake-example h4 {
        color: var(--text-primary);
        margin-bottom: 0.75rem;
        font-size: 1.05rem;
        font-weight: 600;
      }

      .prevention-tips {
        background: var(--success-color);
        background: linear-gradient(135deg, rgba(16, 185, 129, 0.1), rgba(16, 185, 129, 0.05));
        padding: 1.5rem;
        border-radius: 12px;
        border-left: 4px solid var(--success-color);
      }

      .prevention-tips h4 {
        color: var(--success-color);
        margin-bottom: 1rem;
        font-weight: 600;
      }

      .prevention-tips ul {
        list-style: none;
        padding: 0;
      }

      .prevention-tips li {
        padding: 0.5rem 0;
        color: var(--text-secondary);
        display: flex;
        align-items: start;
        gap: 0.75rem;
      }

      .prevention-tips li:before {
        content: "\f00c";
        font-family: "Font Awesome 6 Free";
        font-weight: 900;
        color: var(--success-color);
        margin-top: 0.2rem;
      }

      /* Overview Section */
      .overview-content {
        display: grid;
        grid-template-columns: 2fr 1fr;
        gap: 3rem;
        margin: 3rem 0;
        align-items: start;
      }

      @media (max-width: 968px) {
        .overview-content {
          grid-template-columns: 1fr;
        }
      }

      .overview-text {
        font-size: 1.05rem;
        line-height: 1.8;
        color: var(--text-secondary);
      }

      .overview-text p {
        margin-bottom: 1.5rem;
      }

      .info-card {
        background: var(--primary-light);
        padding: 2rem;
        border-radius: 16px;
        border-left: 4px solid var(--primary-color);
        margin-top: 2rem;
      }

      .info-card h3 {
        color: var(--primary-color);
        margin-bottom: 1rem;
        font-size: 1.4rem;
        font-weight: 700;
      }

      .info-card p {
        color: var(--text-secondary);
        margin: 0;
        line-height: 1.7;
      }

      .overview-image {
        position: sticky;
        top: 100px;
      }

      .overview-image img {
        width: 100%;
        border-radius: 20px;
        box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
        transition: all 0.3s ease;
      }

      .overview-image img:hover {
        transform: scale(1.03);
        box-shadow: 0 15px 50px rgba(0, 0, 0, 0.2);
      }
        color: var(--text-muted);
      }

      .accordion-inner p {
        margin-bottom: 1rem;
      }

      /* Overview Content */
      .overview-content {
        display: grid;
        grid-template-columns: 2fr 1fr;
        gap: 2rem;
        margin-bottom: 2rem;
        align-items: start;
      }

      .overview-text {
        color: var(--text-muted);
      }

      .overview-text p {
        margin-bottom: 1rem;
      }

      .info-card {
        background: var(--card-bg);
        padding: 1.5rem;
        border-radius: 0.5rem;
        border: 1px solid var(--border-color);
        margin-top: 1rem;
      }

      .info-card h3 {
        color: var(--primary-color);
        margin-bottom: 0.5rem;
      }

      .overview-image img {
        width: 100%;
        border-radius: 0.5rem;
        border: 1px solid var(--border-color);
      }

      /* Resource Cards */
      .resource-image {
        width: 100%;
        height: 200px;
        object-fit: cover;
        border-radius: 0.5rem;
        margin-bottom: 1rem;
      }

      .badge {
        position: absolute;
        top: 1rem;
        left: 1rem;
        padding: 0.25rem 0.75rem;
        border-radius: 1rem;
        font-size: 0.75rem;
        font-weight: 600;
        color: white;
      }

      .badge-free {
        background: var(--secondary-color);
      }

      .badge-premium {
        background: var(--primary-color);
      }

      .resource-card {
        position: relative;
      }

      /* Mobile Responsiveness */
      @media (max-width: 1024px) {
        .section {
          padding: 3rem 0;
        }

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

        .tab-navigation {
          overflow-x: auto;
          justify-content: flex-start;
          -webkit-overflow-scrolling: touch;
        }

        .tab-button {
          white-space: nowrap;
          min-width: auto;
        }
      }

      @media (max-width: 768px) {
        .eiken-hero {
          min-height: auto;
          padding: 4rem 0 3rem;
        }

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

        .hero-subtitle {
          font-size: 1rem;
        }

        .hero-stats {
          gap: 1rem;
        }

        .stat-item {
          min-width: 120px;
          padding: 0.875rem;
        }

        .quick-navigation-bar {
          top: 70px;
        }

        .quick-nav {
          gap: 0.35rem;
          padding: 0.5rem;
        }

        .quick-nav-item {
          padding: 0.6rem 0.8rem;
          min-width: 70px;
        }

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

        .quick-nav-item span {
          font-size: 0.75rem;
        }

        .hero-cta {
          flex-direction: column;
          width: 100%;
        }

        .btn-primary,
        .btn-secondary {
          width: 100%;
          justify-content: center;
          padding: 1rem 2rem;
        }

        .section-title {
          font-size: 1.75rem;
        }

        .section-subtitle {
          font-size: 1rem;
        }

        .sections-grid,
        .resources-cards,
        .test-grid {
          grid-template-columns: 1fr;
          gap: 1.5rem;
        }

        .tab-navigation {
          padding: 0.5rem;
          gap: 0.35rem;
        }

        .tab-button {
          padding: 0.65rem 1rem;
          font-size: 0.85rem;
        }

        .level-content {
          gap: 1.5rem;
        }

        .level-info {
          padding: 1.75rem;
        }

        .level-info h3 {
          font-size: 1.4rem;
        }

        .overview-content {
          gap: 2rem;
        }

        .accordion-header h3,
        .mistake-header h3 {
          font-size: 1.1rem;
        }

        .accordion-inner,
        .mistake-inner {
          padding: 1.5rem;
        }

        .calculator-section,
        .planner-container {
          padding: 1.5rem;
        }
      }

      @media (max-width: 480px) {
        .eiken-hero {
          min-height: auto;
          padding: 3rem 0;
        }

        .hero-title {
          font-size: 1.75rem;
        }

        .hero-subtitle {
          font-size: 1rem;
        }

        .hero-badge {
          padding: 0.5rem 1rem;
          font-size: 0.8rem;
        }

        .hero-stats {
          gap: 0.75rem;
        }

        .stat-item {
          min-width: 100px;
          padding: 0.75rem;
        }

        .stat-icon {
          width: 32px;
          height: 32px;
        }

        .stat-icon i {
          font-size: 0.9rem;
        }

        .stat-number {
          font-size: 1.2rem;
        }

        .stat-label {
          font-size: 0.7rem;
        }

        .hero-cta {
          flex-direction: column;
          gap: 0.75rem;
        }

        .hero-cta .btn-primary,
        .hero-cta .btn-secondary {
          width: 100%;
          justify-content: center;
          padding: 0.875rem 1.5rem;
        }

        .quick-nav {
          flex-wrap: nowrap;
          overflow-x: auto;
          justify-content: flex-start;
          -webkit-overflow-scrolling: touch;
          padding: 0.5rem;
        }

        .quick-nav-item {
          min-width: 65px;
          padding: 0.5rem 0.6rem;
        }

        .section {
          padding: 2.5rem 0;
        }

        .section-title {
          font-size: 1.5rem;
        }

        .section-subtitle {
          font-size: 0.95rem;
        }

        .section-card,
        .resource-card,
        .test-card {
          padding: 1.5rem;
        }

        .section-icon,
        .test-icon {
          font-size: 2rem;
          width: 60px;
          height: 60px;
        }

        .tab-button {
          padding: 0.6rem 0.85rem;
          font-size: 0.8rem;
        }

        .level-info {
          padding: 1.5rem;
        }

        .level-details {
          padding: 1rem;
        }

        .accordion-header,
        .mistake-header {
          padding: 1rem 1.25rem;
        }

        .accordion-header h3,
        .mistake-header h3 {
          font-size: 1rem;
        }

        .mistake-icon {
          width: 35px;
          height: 35px;
          font-size: 1rem;
        }

        .btn-outline {
          padding: 0.6rem 1.25rem;
          font-size: 0.9rem;
        }
      }
        .resources-hero h1 {
          font-size: 2rem;
        }
        
        .resources-hero p {
          font-size: 1rem;
        }
        
        .sections-grid,
        .resources-cards,
        .test-grid {
          grid-template-columns: 1fr;
          gap: 1rem;
        }
        
        .level-content,
        .overview-content {
          grid-template-columns: 1fr;
          gap: 1rem;
        }
        
        .tab-button {
          padding: 0.5rem;
          font-size: 0.875rem;
        }

        .container {
          padding: 0 0.5rem;
        }

        .section {
          padding: 2rem 0;
        }
      }

      .accordion-header h3 {
        font-size: 1.1rem;
        font-weight: 600;
        margin: 0;
        color: var(--text-color);
      }
      .accordion-icon {
        font-size: 1.2rem;
        transition: transform var(--transition-speed);
        color: var(--primary-color);
      }
      .accordion-content {
        max-height: 0;
        overflow: hidden;
        transition: max-height var(--transition-speed) ease-out;
        background: #f9fafb;
      }
      .accordion-item.active .accordion-content {
        max-height: 500px;
      }
      .accordion-item.active .accordion-icon {
        transform: rotate(180deg);
      }
      .accordion-inner {
        padding: 0 1.25rem 1.25rem;
      }
      .accordion-inner p {
        margin: 0.75em 0;
        line-height: 1.6;
      }

      /* Grid layouts for sections and cards */
      .sections-grid,
      .resources-cards,
      .test-grid,
      .product-slider {
        display: flex;
        flex-wrap: wrap;
        gap: 2rem;
        justify-content: center;
      }

      /* Card styles for overview, resources, tests, products */
      .section-card,
      .resource-card,
      .test-card,
      .product-card {
        background: #fff;
        border-radius: 1rem;
        box-shadow: 0 2px 16px rgba(0, 0, 0, 0.08);
        padding: 1.5rem;
        max-width: 320px;
        flex: 1 1 280px;
        display: flex;
        flex-direction: column;
        align-items: center;
        position: relative;
      }

      /* Card icons */
      .section-icon,
      .test-icon {
        font-size: 2.2rem;
        color: var(--primary-color);
        margin-bottom: 0.5rem;
      }

      /* Badges for free/premium resources */
      .badge {
        position: absolute;
        top: 1rem;
        left: 1rem;
        padding: 0.3em 0.7em;
        border-radius: 1em;
        font-size: 0.85em;
        font-weight: 600;
        color: #fff;
      }
      .badge-free {
        background: var(--secondary-color);
      }
      .badge-premium {
        background: var(--primary-color);
      }

      /* Product slider styles */
      .product-slider {
        position: relative;
        display: flex;
        flex-wrap: nowrap;
        gap: 1.5rem;
        overflow-x: auto;
        scroll-snap-type: x mandatory;
        scroll-behavior: smooth;
        -webkit-overflow-scrolling: touch;
        padding: 1rem 0;
        margin: 0 -1.5rem;
        padding-left: 1.5rem;
      }
      .product-slider::-webkit-scrollbar {
        display: none;
      }
      .product-card {
        scroll-snap-align: start;
        flex: 0 0 300px;
      }
      .product-image {
        width: 100%;
        height: 180px;
        object-fit: cover;
        margin-bottom: 1rem;
      }
      .product-title {
        font-size: 1.2rem;
        margin-bottom: 0.5rem;
        color: var(--text-color);
      }
      .product-price {
        font-weight: 700;
        color: var(--primary-color);
        margin-bottom: 0.5rem;
      }
      .product-description {
        font-size: 0.9rem;
        color: #6b7280;
        margin-bottom: 1rem;
        flex-grow: 1;
      }

      /* Newsletter form improvements */
      .newsletter-form {
        display: flex;
        max-width: 500px;
        margin: 0 auto;
        gap: 0.5rem;
      }
      .newsletter-form input {
        flex-grow: 1;
        padding: 0.75rem 1rem;
        border: 1px solid #d1d5db;
        border-radius: 0.5rem;
        font-size: 1rem;
      }
      .newsletter-form input:focus {
        outline: none;
        border-color: var(--primary-color);
      }
      .privacy-note {
        font-size: 0.8rem;
        color: #6b7280;
        margin-top: 1rem;
      }

      /* Responsive improvements */
      @media (max-width: 900px) {
        .footer-content {
          flex-direction: column;
          align-items: flex-start;
          gap: 1.5rem;
        }
      }
      @media (max-width: 768px) {
        .resources-hero {
          min-height: 280px;
          padding: 1.5rem 1rem;
        }
        .resources-hero-content {
          padding: 2rem 0.5rem 1.5rem 0.5rem;
        }
        .resources-hero h1 {
          font-size: 2rem;
        }
        .resources-hero p {
          font-size: 1.1rem;
        }
        .floating-element {
          font-size: 1.5rem;
        }
        .section-title {
          font-size: 1.7rem;
        }
        .newsletter-form {
          flex-direction: column;
        }
        .accordion-header {
          padding: 1rem;
        }
        .sections-grid,
        .resources-cards,
        .test-grid,
        .product-slider {
          gap: 1rem;
        }
        .section-card,
        .resource-card,
        .test-card,
        .product-card {
          max-width: 100%;
          padding: 1rem;
        }
      }

      /* Enhanced Tab Navigation */
      .level-tabs {
        margin-top: 2rem;
      }
      .tab-navigation {
        display: flex;
        flex-wrap: wrap;
        gap: 0.5rem;
        margin-bottom: 2rem;
        background: #f8fafc;
        padding: 0.5rem;
        border-radius: 0.75rem;
        justify-content: center;
      }
      .tab-button {
        background: transparent;
        border: none;
        padding: 0.75rem 1.5rem;
        border-radius: 0.5rem;
        font-weight: 500;
        color: #6b7280;
        cursor: pointer;
        transition: all var(--transition-speed);
        position: relative;
        overflow: hidden;
      }
      .tab-button::before {
        content: '';
        position: absolute;
        top: 0;
        left: -100%;
        width: 100%;
        height: 100%;
        background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
        transition: left 0.6s;
      }
      .tab-button:hover::before {
        left: 100%;
      }
      .tab-button:hover {
        color: var(--primary-color);
        background: rgba(79, 70, 229, 0.05);
      }
      .tab-button.active {
        background: var(--primary-color);
        color: white;
        box-shadow: 0 2px 8px rgba(79, 70, 229, 0.25);
      }
      .tab-button.active::before {
        display: none;
      }
      
      /* Tab content animations */
      .tab-content {
        position: relative;
        min-height: 400px;
      }
      .tab-pane {
        opacity: 0;
        transform: translateX(20px);
        transition: all var(--transition-speed);
        position: absolute;
        width: 100%;
        top: 0;
      }
      .tab-pane.active {
        opacity: 1;
        transform: translateX(0);
        position: relative;
      }
      
      /* Level content layout */
      .level-content {
        display: grid;
        grid-template-columns: 1fr 300px;
        gap: 2rem;
        align-items: start;
      }
      .level-info {
        background: #fff;
        padding: 2rem;
        border-radius: 1rem;
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
      }
      .level-details {
        list-style: none;
        padding: 0;
        margin: 1.5rem 0;
      }
      .level-details li {
        padding: 0.5rem 0;
        border-bottom: 1px solid #f3f4f6;
        display: flex;
        justify-content: space-between;
      }
      .level-details li:last-child {
        border-bottom: none;
      }
      .level-image {
        position: sticky;
        top: 2rem;
      }
      .level-image img {
        width: 100%;
        height: auto;
        border-radius: 0.75rem;
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
      }

      @media (max-width: 768px) {
        .tab-navigation {
          grid-template-columns: repeat(2, 1fr);
          display: grid;
        }
        .tab-button {
          padding: 0.5rem 1rem;
          font-size: 0.875rem;
        }
        .level-content {
          grid-template-columns: 1fr;
          gap: 1rem;
        }
        .level-image {
          position: static;
        }
      }
      /* Result details styling */
      .result-details {
        display: flex;
        justify-content: center;
        gap: 2rem;
        margin: 1rem 0;
        flex-wrap: wrap;
      }
      .detail-item {
        display: flex;
        align-items: center;
        gap: 0.5rem;
        color: #6b7280;
        font-size: 0.9rem;
      }
      .detail-item i {
        color: var(--primary-color);
      }

      /* Quick Guide Styles */
      .quick-guide {
        background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
      }
      .quick-guide-steps {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: 2rem;
        margin-top: 3rem;
      }
      .guide-step {
        background: #fff;
        border-radius: 1rem;
        padding: 2rem;
        box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
        border: 1px solid rgba(0, 0, 0, 0.05);
        position: relative;
        overflow: hidden;
        transition: all var(--transition-speed);
      }
      .guide-step:hover {
        transform: translateY(-5px);
        box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
      }
      .guide-step::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        height: 4px;
        background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
      }
      .step-number {
        width: 60px;
        height: 60px;
        border-radius: 50%;
        background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
        color: white;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 1.5rem;
        font-weight: 700;
        margin-bottom: 1.5rem;
        box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
      }
      .step-content h3 {
        color: var(--text-color);
        margin-bottom: 1rem;
        font-size: 1.2rem;
      }
      .step-content p {
        color: #6b7280;
        line-height: 1.6;
        margin-bottom: 1.5rem;
      }
      .step-action {
        display: inline-flex;
        align-items: center;
        gap: 0.5rem;
        color: var(--primary-color);
        text-decoration: none;
        font-weight: 600;
        padding: 0.5rem 1rem;
        border-radius: 0.5rem;
        border: 2px solid var(--primary-color);
        transition: all var(--transition-speed);
      }
      .step-action:hover {
        background: var(--primary-color);
        color: white;
        transform: translateY(-2px);
      }

      /* Back to top button */
      .back-to-top {
        position: fixed;
        bottom: 2rem;
        right: 2rem;
        width: 50px;
        height: 50px;
        background: var(--primary-color);
        color: white;
        border: none;
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        cursor: pointer;
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-speed);
        z-index: 1000;
        box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
      }
      .back-to-top.visible {
        opacity: 1;
        visibility: visible;
      }
      .back-to-top:hover {
        background: var(--primary-hover);
        transform: translateY(-3px);
        box-shadow: 0 6px 16px rgba(79, 70, 229, 0.4);
      }

      /* Accessibility improvements */
      .sr-only {
        position: absolute;
        width: 1px;
        height: 1px;
        padding: 0;
        margin: -1px;
        overflow: hidden;
        clip: rect(0, 0, 0, 0);
        white-space: nowrap;
        border: 0;
      }

      .sr-only-focusable:focus {
        position: static;
        width: auto;
        height: auto;
        padding: 0.5rem 1rem;
        margin: 0;
        overflow: visible;
        clip: auto;
        white-space: normal;
        background: var(--primary-color);
        color: white;
        text-decoration: none;
        border-radius: 0.25rem;
        z-index: 10000;
      }

      /* Focus styles for keyboard navigation */
      *:focus {
        outline: 2px solid var(--primary-color);
        outline-offset: 2px;
      }

      .btn:focus,
      .btn-outline:focus,
      .tab-button:focus,
      .skill-card:focus {
        outline: 3px solid var(--primary-color);
        outline-offset: 2px;
      }


      .container {
        max-width: 1200px;
        margin: 0 auto;
        padding: 0 1rem;
      }

      .section {
        padding: 3rem 0;
      }

      .section-title {
        font-size: 2rem;
        font-weight: 600;
        margin-bottom: 1rem;
        color: var(--primary-color);
        text-align: center;
      }

      .section-subtitle {
        text-align: center;
        color: var(--text-muted);
        margin-bottom: 2rem;
      }

      /* Tab system */
      .tab-navigation {
        display: flex;
        flex-wrap: wrap;
        gap: 0.5rem;
        margin-bottom: 2rem;
        background: #f8fafc;
        padding: 0.5rem;
        border-radius: 0.5rem;
        justify-content: center;
      }

      .tab-button {
        background: transparent;
        border: none;
        padding: 0.75rem 1rem;
        border-radius: 0.25rem;
        color: var(--text-muted);
        cursor: pointer;
        transition: var(--transition);
      }

      .tab-button:hover {
        color: var(--primary-color);
        background: rgba(79, 70, 229, 0.05);
      }

      .tab-button.active {
        background: var(--primary-color);
        color: white;
      }

      .tab-pane {
        display: none;
      }

      .tab-pane.active {
        display: block;
      }

      .level-content {
        display: grid;
        grid-template-columns: 2fr 1fr;
        gap: 2rem;
      }

      .level-info {
        background: var(--background);
        padding: 2rem;
        border-radius: 0.5rem;
        border: 1px solid var(--border-color);
      }

      .level-details {
        list-style: none;
        padding: 0;
        margin: 1rem 0;
      }

      .level-details li {
        padding: 0.5rem 0;
        border-bottom: 1px solid var(--border-color);
      }

      .level-details li:last-child {
        border-bottom: none;
      }

      /* Accordion */
      .accordion-item {
        border: 1px solid var(--border-color);
        border-radius: 0.5rem;
        margin-bottom: 0.5rem;
      }

      .accordion-header {
        padding: 1rem;
        cursor: pointer;
        background: var(--background);
        transition: var(--transition);
      }

      .accordion-header:hover {
        background: #f8fafc;
      }

      .accordion-header h3 {
        margin: 0;
        color: var(--text-color);
      }

      .accordion-content {
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease;
      }

      .accordion-item.active .accordion-content {
        max-height: 500px;
      }

      .accordion-inner {
        padding: 1rem;
        color: var(--text-muted);
      }

      /* Study Techniques Section */
      .study-techniques {
        background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
      }
      
      .techniques-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        gap: 2rem;
        margin-top: 2rem;
      }
      
      .technique-card {
        background: white;
        padding: 2rem;
        border-radius: 1rem;
        box-shadow: 0 4px 6px rgba(0, 0, 0, 0.07);
        border: 1px solid rgba(0, 0, 0, 0.05);
        transition: all var(--transition);
      }
      
      .technique-card:hover {
        transform: translateY(-5px);
        box-shadow: 0 8px 25px rgba(0, 0, 0, 0.12);
      }
      
      .technique-icon {
        width: 60px;
        height: 60px;
        border-radius: 50%;
        background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
        display: flex;
        align-items: center;
        justify-content: center;
        margin-bottom: 1.5rem;
      }
      
      .technique-icon i {
        font-size: 1.5rem;
        color: white;
      }
      
      .technique-tips {
        margin-top: 1.5rem;
        padding-top: 1.5rem;
        border-top: 2px solid #f1f5f9;
      }
      
      .technique-tips h4 {
        color: var(--primary-color);
        margin-bottom: 0.75rem;
        font-size: 1rem;
      }
      
      .technique-tips ul {
        list-style: none;
        padding: 0;
      }
      
      .technique-tips li {
        padding: 0.25rem 0;
        padding-left: 1.5rem;
        position: relative;
        color: var(--text-muted);
        font-size: 0.9rem;
      }
      
      .technique-tips li::before {
        content: '✓';
        position: absolute;
        left: 0;
        color: var(--secondary-color);
        font-weight: bold;
      }

      /* Common Mistakes Section */
      .common-mistakes {
        background: #fff;
      }
      
      .mistakes-accordion {
        max-width: 800px;
        margin: 0 auto;
      }
      
      .mistake-item {
        border: 2px solid #f1f5f9;
        border-radius: 1rem;
        margin-bottom: 1rem;
        background: white;
        overflow: hidden;
        transition: all var(--transition);
      }
      
      .mistake-item:hover {
        border-color: var(--primary-color);
        transform: translateY(-2px);
        box-shadow: 0 8px 25px rgba(79, 70, 229, 0.1);
      }
      
      .mistake-header {
        padding: 1.5rem;
        cursor: pointer;
        display: flex;
        align-items: center;
        gap: 1rem;
        transition: all var(--transition);
      }
      
      .mistake-header:hover {
        background: #f8fafc;
      }
      
      .mistake-icon {
        width: 50px;
        height: 50px;
        border-radius: 50%;
        background: linear-gradient(135deg, #ef4444, #dc2626);
        display: flex;
        align-items: center;
        justify-content: center;
        flex-shrink: 0;
      }
      
      .mistake-icon i {
        color: white;
        font-size: 1.2rem;
      }
      
      .mistake-header h3 {
        flex-grow: 1;
        margin: 0;
        color: var(--text-color);
      }
      
      .mistake-content {
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.4s ease;
      }
      
      .mistake-item.active .mistake-content {
        max-height: 800px;
      }
      
      .mistake-inner {
        padding: 0 1.5rem 1.5rem;
      }
      
      .mistake-example {
        background: #f8fafc;
        padding: 1.5rem;
        border-radius: 0.75rem;
        margin-bottom: 1.5rem;
      }
      
      .mistake-example h4 {
        margin-bottom: 0.75rem;
        font-size: 1rem;
      }
      
      .prevention-tips {
        background: #f0fdf4;
        padding: 1.5rem;
        border-radius: 0.75rem;
        border-left: 4px solid var(--secondary-color);
      }
      
      .prevention-tips h4 {
        color: var(--secondary-color);
        margin-bottom: 0.75rem;
      }
      
      .prevention-tips ul {
        margin: 0;
        padding-left: 1rem;
      }
      
      .prevention-tips li {
        margin-bottom: 0.5rem;
        color: var(--text-muted);
      }

      /* Study Planner Section */
      .study-planner {
        background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
        color: white;
      }
      
      .study-planner .section-title,
      .study-planner .section-subtitle {
        color: white;
      }
      
      .planner-container {
        background: white;
        border-radius: 1rem;
        padding: 2rem;
        color: var(--text-color);
        max-width: 800px;
        margin: 0 auto;
      }
      
      .planner-form {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: 1.5rem;
        margin-bottom: 2rem;
      }
      
      .plan-result {
        margin-top: 2rem;
        padding-top: 2rem;
        border-top: 2px solid #f1f5f9;
      }
      
      .plan-overview {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 1.5rem;
        margin: 2rem 0;
      }
      
      .plan-stat {
        text-align: center;
        padding: 1.5rem;
        background: #f8fafc;
        border-radius: 0.75rem;
      }
      
      
      
      .plan-phases {
        display: grid;
        gap: 1.5rem;
      }
      
      .phase-item {
        padding: 1.5rem;
        background: #f0fdf4;
        border-radius: 0.75rem;
        border-left: 4px solid var(--secondary-color);
      }
      
      .phase-item h4 {
        color: var(--secondary-color);
        margin-bottom: 1rem;
      }
      
      .phase-item ul {
        margin: 0;
        padding-left: 1rem;
      }
      
      .phase-item li {
        margin-bottom: 0.5rem;
        color: var(--text-muted);
      }

      /* Progress Tracker Section */
      .progress-tracker {
        background: #f8fafc;
      }
      
      .tracker-dashboard {
        display: grid;
        grid-template-columns: 2fr 1fr;
        gap: 3rem;
        margin-top: 2rem;
      }
      
      .skill-progress {
        background: white;
        padding: 2rem;
        border-radius: 1rem;
        box-shadow: 0 4px 6px rgba(0, 0, 0, 0.07);
      }
      
      .skill-item {
        margin-bottom: 2rem;
      }
      
      .skill-header {
        display: flex;
        justify-content: space-between;
        align-items: center;
        margin-bottom: 0.75rem;
      }
      
      .skill-header h4 {
        margin: 0;
        color: var(--text-color);
      }
      
      .skill-score {
        font-weight: bold;
        color: var(--primary-color);
      }
      
      .progress-bar {
        height: 12px;
        background: #e2e8f0;
        border-radius: 6px;
        overflow: hidden;
        margin-bottom: 0.5rem;
      }
      
      .progress-fill {
        height: 100%;
        background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
        border-radius: 6px;
        transition: width 0.5s ease;
      }
      
      .skill-status {
        font-size: 0.85rem;
        color: var(--text-muted);
        margin: 0;
      }
      
      .achievement-badges {
        background: white;
        padding: 2rem;
        border-radius: 1rem;
        box-shadow: 0 4px 6px rgba(0, 0, 0, 0.07);
        height: fit-content;
      }
      
      .achievement-badges h4 {
        text-align: center;
        margin-bottom: 1.5rem;
        color: var(--text-color);
      }
      
      /* Study Streak Counter */
      .study-streak {
        background: linear-gradient(135deg, #fef3c7, #fbbf24);
        padding: 2rem;
        border-radius: 1rem;
        text-align: center;
        margin-bottom: 2rem;
        position: relative;
        overflow: hidden;
      }

      .study-streak::before {
        content: '';
        position: absolute;
        top: -50%;
        left: -50%;
        width: 200%;
        height: 200%;
        background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
        animation: shimmer 3s infinite;
      }