:root {
    --motrac-red: #E30613;
    --motrac-dark: #1F1F1F;
    --motrac-light: #FFFFFF;
    --motrac-grey: #F5F5F5;
    --motrac-border: #DDDDDD;
    --motrac-text: #222222;
}

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
    background: var(--motrac-grey);
    color: var(--motrac-text);
    font-family: "Helvetica Neue", Arial, sans-serif;
    font-size: 16px;
    line-height: 1.5;
}

.site-header {
    background: var(--motrac-light);
    border-bottom: 1px solid var(--motrac-border);
}

.header-inner {
    max-width: 960px;
    margin: 0 auto;
    padding: 16px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    height: 36px;
    width: auto;
}

.tool-label {
    color: var(--motrac-dark);
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.container {
    max-width: 720px;
    margin: 48px auto;
    padding: 0 24px;
}

.card {
    background: var(--motrac-light);
    border: 1px solid var(--motrac-border);
    border-radius: 4px;
    padding: 40px;
}

h1 {
    margin: 0 0 16px;
    font-size: 26px;
    color: var(--motrac-dark);
}

.intro {
    margin: 0 0 24px;
    color: var(--motrac-text);
}

.upload-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.file-field {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.file-field-label {
    font-weight: 600;
    color: var(--motrac-dark);
}

input[type="file"] {
    padding: 12px;
    border: 1px solid var(--motrac-border);
    border-radius: 4px;
    background: var(--motrac-grey);
    font-size: 14px;
}

.file-name {
    font-size: 13px;
    color: #555;
}

.btn {
    display: inline-block;
    padding: 12px 22px;
    border-radius: 4px;
    border: 1px solid transparent;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    text-align: center;
    transition: background-color 0.1s ease;
}

.btn-primary {
    background: var(--motrac-red);
    color: var(--motrac-light);
    border-color: var(--motrac-red);
}

.btn-primary:hover {
    background: #b80510;
    border-color: #b80510;
}

.btn-secondary {
    background: var(--motrac-light);
    color: var(--motrac-dark);
    border-color: var(--motrac-border);
}

.btn-secondary:hover {
    background: var(--motrac-grey);
}

.hint {
    margin: 0;
    font-size: 13px;
    color: #555;
}

.warning {
    margin: 0;
    font-size: 13px;
    color: var(--motrac-dark);
    background: #FFF7E0;
    border-left: 3px solid #E0A800;
    padding: 8px 12px;
    border-radius: 2px;
}

.alert {
    padding: 12px 16px;
    border-radius: 4px;
    margin-bottom: 24px;
    border: 1px solid transparent;
}

.alert-error {
    background: #FDECEE;
    border-color: var(--motrac-red);
    color: #6A0107;
}

.alert-success {
    background: #E8F5E9;
    border-color: #2E7D32;
    color: #1B5E20;
}

.alert-warning {
    background: #FFF7E0;
    border-color: #E0A800;
    color: #5C4500;
}

.result-meta {
    display: grid;
    grid-template-columns: max-content 1fr;
    gap: 8px 24px;
    margin: 0 0 24px;
    padding: 16px;
    background: var(--motrac-grey);
    border: 1px solid var(--motrac-border);
    border-radius: 4px;
}

.result-meta dt {
    font-weight: 600;
    color: var(--motrac-dark);
}

.result-meta dd {
    margin: 0;
}

.actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.site-footer {
    max-width: 960px;
    margin: 24px auto 48px;
    padding: 0 24px;
    color: #666;
    font-size: 13px;
    text-align: center;
}

@media (max-width: 600px) {
    .card {
        padding: 24px;
    }

    .container {
        margin: 24px auto;
    }

    .actions {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }
}