.btn-start{
        background: #1e3f65;
    }

    .top-header {
        background: linear-gradient(135deg, #1f4068 0%, #162447 100%);
        padding: 1.8rem 0;
        box-shadow: 0 4px 20px rgba(0,0,0,0.3);
        position: sticky;
        top: 0;
        z-index: 1000;
    }

    .header-wrapper {
        max-width: 1400px;
        margin: 0 auto;
        padding: 0 2rem;
        display: flex;
        justify-content: space-between;
        align-items: center;
    }

    .logo-title {
        font-size: 2rem;
        font-weight: 700;
        color: #fff;
        display: flex;
        align-items: center;
        gap: 0.5rem;
    }

    .content-wrapper {
        max-width: 1400px;
        margin: 3rem auto;
        padding: 0 2rem;
    }

    .decoder-card {
        background: rgba(255, 255, 255, 0.98);
        border-radius: 20px;
        padding: 3rem;
        margin-bottom: 2.5rem;
        box-shadow: 0 10px 40px rgba(0,0,0,0.2);
        backdrop-filter: blur(10px);
    }

    .card-title {
        color: #1f4068;
        margin-bottom: 1rem;
        font-size: 2.2rem;
        font-weight: 700;
        letter-spacing: -0.5px;
    }

    .card-subtitle {
        color: #666;
        margin-bottom: 2rem;
        font-size: 1.05rem;
    }

    .decode-grid {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 2rem;
        margin-bottom: 2rem;
    }

    .input-group {
        display: flex;
        flex-direction: column;
    }

    .input-label {
        color: #1f4068;
        font-weight: 600;
        margin-bottom: 0.8rem;
        font-size: 1.15rem;
        display: flex;
        align-items: center;
        gap: 0.5rem;
    }

    .text-area {
        width: 100%;
        min-height: 320px;
        padding: 1.2rem;
        border: 2px solid #e8e8e8;
        border-radius: 12px;
        font-family: 'Consolas', 'Monaco', monospace;
        font-size: 15px;
        resize: vertical;
        transition: all 0.3s ease;
        background: #fafafa;
    }

    .text-area:focus {
        outline: none;
        border-color: #1f4068;
        background: #fff;
        box-shadow: 0 0 0 4px rgba(31, 64, 104, 0.1);
    }

    .action-buttons {
        display: flex;
        gap: 1.2rem;
        flex-wrap: wrap;
        margin-bottom: 1.5rem;
    }

    .primary-btn {
        background: linear-gradient(135deg, #1f4068 0%, #162447 100%);
        color: white;
        border: none;
        padding: 1rem 2.5rem;
        border-radius: 10px;
        font-size: 1.05rem;
        cursor: pointer;
        transition: all 0.3s ease;
        font-weight: 600;
        box-shadow: 0 4px 15px rgba(31, 64, 104, 0.3);
    }

    .primary-btn:hover {
        transform: translateY(-3px);
        box-shadow: 0 6px 25px rgba(31, 64, 104, 0.4);
    }

    .primary-btn:active {
        transform: translateY(-1px);
    }

    .info-stats {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
        gap: 1.5rem;
        margin-top: 2rem;
    }

    .stat-card {
        background: linear-gradient(135deg, #f8f9ff 0%, #f0f2ff 100%);
        padding: 1.5rem;
        border-radius: 12px;
        border-left: 5px solid #1f4068;
        transition: transform 0.3s ease;
    }

    .stat-card:hover {
        transform: translateX(5px);
    }

    .stat-label {
        color: #666;
        font-size: 0.95rem;
        font-weight: 500;
    }

    .stat-value {
        color: #1f4068;
        font-size: 1.8rem;
        font-weight: 700;
        margin-top: 0.5rem;
    }

    .about-card {
        background: rgba(255, 255, 255, 0.98);
        border-radius: 20px;
        padding: 3rem;
        margin-bottom: 2.5rem;
        box-shadow: 0 10px 40px rgba(0,0,0,0.2);
    }

    .about-card .card-title {
        color: #1f4068;
        margin-bottom: 1.5rem;
    }

    .about-text {
        color: #555;
        margin-bottom: 1.5rem;
        line-height: 1.9;
        font-size: 1.05rem;
    }

    .faq-card {
        background: rgba(255, 255, 255, 0.98);
        border-radius: 20px;
        padding: 3rem;
        margin-bottom: 2.5rem;
        box-shadow: 0 10px 40px rgba(0,0,0,0.2);
    }

    .faq-card .card-title {
        color: #1f4068;
        margin-bottom: 2rem;
    }

    .faq-block {
        margin-bottom: 2rem;
        padding-bottom: 1.5rem;
        border-bottom: 2px solid #f0f0f0;
    }

    .faq-block:last-child {
        border-bottom: none;
    }

    .faq-title {
        color: #1f4068;
        font-weight: 600;
        font-size: 1.2rem;
        margin-bottom: 0.8rem;
        display: flex;
        align-items: flex-start;
        gap: 0.5rem;
    }

    .faq-content {
        color: #666;
        line-height: 1.9;
        font-size: 1.02rem;
    }

    .bottom-footer {
        background: linear-gradient(135deg, #162447 0%, #1f4068 100%);
        color: rgba(255,255,255,0.9);
        text-align: center;
        padding: 2.5rem 0;
        margin-top: 4rem;
        box-shadow: 0 -4px 20px rgba(0,0,0,0.2);
    }

    .footer-text {
        max-width: 1400px;
        margin: 0 auto;
        padding: 0 2rem;
        font-size: 1.05rem;
    }

    .highlight {
        color: #fff;
        font-weight: 600;
    }

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

        .header-wrapper {
            flex-direction: column;
            gap: 1.5rem;
            text-align: center;
        }

        .nav-menu {
            flex-wrap: wrap;
            justify-content: center;
        }

        .decoder-card, .about-card, .faq-card {
            padding: 2rem;
        }
    }

    @media (max-width: 640px) {
        .action-buttons {
            flex-direction: column;
        }

        .primary-btn {
            width: 100%;
        }
    }