body {
    background: #fff;
    color: #222;
    min-height: 100vh;
    padding: 0;
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
}

.container {
    max-width: 700px;
    margin: 30px auto;
    background: #fff;
    border: 1px solid #eee;
    border-radius: 6px;
    box-shadow: none;
    padding: 0;
}

header {
    background: #1976d2;
    color: white;
    padding: 18px 0;
    text-align: center;
    border-radius: 6px 6px 0 0;
}

h1 {
    font-size: 1.6rem;
    margin-bottom: 5px;
}

.subtitle {
    font-size: 1rem;
    opacity: 0.9;
}

.main-content {
    padding: 20px 18px;
}

.upload-section {
    background: #f6f6f6;
    border: 1px dashed #1976d2;
    border-radius: 4px;
    padding: 18px;
    text-align: center;
    margin-bottom: 18px;
    transition: background 0.2s, border 0.2s;
}

.upload-section:hover {
    border-color: #1565c0;
    background: #e3f2fd;
}

.file-input {
    margin: 15px 0;
}

.btn {
    color: white;
    border: none;
    padding: 8px 22px;
    font-size: 1rem;
    border-radius: 20px;
    cursor: pointer;
    margin: 6px 4px;
    box-shadow: none;
    transition: background 0.2s;
    display: inline-block;
}

.btn-light {
    background: #ffffff;
    color: #000;
}

.btn:hover {
    background: #a1c7f3;
}

.btn-analyze {
    background: #388e3c;
}

.btn-analyze:hover {
    background: #a4c9a7;
}

.btn-reset:hover {
    background: #b71c1c;
}

.result-section {
    display: none;
    margin-top: 18px;
}

.summary {
    background: #f1f8e9;
    border-left: 4px solid #388e3c;
    padding: 12px 16px;
    border-radius: 3px;
    margin-bottom: 0px;
    font-size: 1.05rem;
}

.success {
    background: #e8f5e9;
    border-left: 4px solid #43a047;
}

.error {
    background: #ffebee;
    border-left: 4px solid #e53935;
    padding-left: 5px;
}

.table-container {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 10px;
    background: #fff;
}

th,
td {
    padding: 10px 8px;
    text-align: left;
    border-bottom: 1px solid #eee;
    font-size: 0.98rem;
}

th {
    background: #1976d2;
    color: white;
    font-weight: 600;
}

tr:nth-child(even) {
    background-color: #fafafa;
}

tr:hover {
    background-color: #f1f1f1;
}

.missing-row {
    background-color: #f8f7f7 !important;
    color: #d32f2f;
    font-weight: bold;
}

.missing-row td {
    border-bottom: 2px solid #d32f2f;
}

.instructions {
    background: #f9fbe7;
    border-left: 4px solid #cddc39;
    padding: 12px 16px;
    border-radius: 3px;
    margin-top: 18px;
    font-size: 0.97rem;
}

.instructions h3 {
    margin-bottom: 8px;
    color: #afb42b;
}

.instructions ul {
    padding-left: 18px;
    margin: 8px 0;
}

.instructions li {
    margin-bottom: 6px;
}

.highlight {
    background: #fffde7;
    padding: 1px 4px;
    border-radius: 2px;
    font-weight: 500;
}

footer {
    text-align: center;
    padding: 14px;
    color: #888;
    background: #fafafa;
    margin-top: 18px;
    border-radius: 0 0 6px 6px;
    font-size: 0.95rem;
}

.loading {
    display: none;
    text-align: center;
    padding: 18px;
}

.spinner {
    border: 3px solid #eee;
    border-left: 3px solid #1976d2;
    border-radius: 50%;
    width: 28px;
    height: 28px;
    animation: spin 1s linear infinite;
    margin: 0 auto 12px;
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(360deg);
    }
}

@media (max-width: 600px) {
    .container {
        margin: 4px;
        padding: 0;
    }

    .main-content {
        padding: 10px 2px;
    }

    th,
    td {
        padding: 7px 3px;
        font-size: 0.92rem;
    }
}