body {
    font-family: 'Poppins', sans-serif;
    margin: 0;
    padding: 0;
    background: linear-gradient(135deg, #e0e7ff 0%, #f3e8ff 100%);
    color: #1a202c;
    overflow-x: hidden;
}

header {
    background: linear-gradient(90deg, #3b82f6, #1d4ed8);
    padding: 20px 0;
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 30px;
}

.logo {
    color: #ffffff;
    font-size: 28px;
    font-weight: 700;
    letter-spacing: 1px;
}

nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    gap: 25px;
}

nav ul li a {
    color: #ffffff;
    text-decoration: none;
    font-size: 16px;
    font-weight: 600;
    padding: 10px 15px;
    border-radius: 6px;
    transition: background-color 0.3s, transform 0.2s;
}

nav ul li a:hover, nav ul li a.active {
    background-color: #1e40af;
    transform: translateY(-2px);
}

main {
    margin-top: 100px;
    padding: 40px 20px;
}

.section {
    display: none;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s, transform 0.5s;
}

.section.active {
    display: block;
    opacity: 1;
    transform: translateY(0);
}

.container {
    max-width: 900px;
    margin: 0 auto;
    background: #ffffff;
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.15);
    transition: transform 0.3s;
}

.container:hover {
    transform: translateY(-5px);
}

h1 {
    font-size: 32px;
    color: #1d4ed8;
    text-align: center;
    margin-bottom: 30px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.input-section {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-bottom: 30px;
}

input[type="text"], input[type="number"], textarea, input[type="file"] {
    padding: 14px;
    border: 1px solid #d1d5db;
    border-radius: 8px;
    font-size: 16px;
    width: 100%;
    box-sizing: border-box;
    background: #f9fafb;
    transition: border-color 0.3s, box-shadow 0.3s;
}

input:focus, textarea:focus {
    border-color: #3b82f6;
    box-shadow: 0 0 8px rgba(59, 130, 246, 0.3);
    outline: none;
}

textarea {
    height: 140px;
    resize: vertical;
}

button {
    padding: 14px 28px;
    background: linear-gradient(90deg, #3b82f6, #1d4ed8);
    color: #ffffff;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 600;
    text-transform: uppercase;
    transition: transform 0.3s, box-shadow 0.3s;
}

button:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 12px rgba(0,0,0,0.2);
}

.results {
    display: none;
    padding: 25px;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    background: #f9fafb;
    animation: fadeIn 0.5s;
}

.results.show {
    display: block;
}

.error {
    color: #dc2626;
    text-align: center;
    margin-bottom: 20px;
    display: none;
    font-size: 16px;
    font-weight: 600;
    animation: fadeIn 0.5s;
}

.error.show {
    display: block;
}

table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    margin-top: 20px;
    border-radius: 8px;
    overflow: hidden;
}

th, td {
    padding: 14px;
    border: 1px solid #e5e7eb;
    text-align: left;
    font-size: 16px;
}

th {
    background: #e5e7eb;
    font-weight: 600;
    color: #1a202c;
}

td {
    background: #ffffff;
}

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

@media (max-width: 768px) {
    .header-container {
        flex-direction: column;
        gap: 15px;
    }
    nav ul {
        flex-direction: column;
        align-items: center;
        gap: 15px;
    }
    .container {
        width: 90%;
        padding: 20px;
    }
    h1 {
        font-size: 28px;
    }
}

@media (max-width: 480px) {
    input[type="text"], input[type="number"], textarea, button {
        font-size: 14px;
    }
    button {
        width: 100%;
    }
}