:root {
    --bg-light: #f4f7f9;
    --card-light: #ffffff;
    --ozon-blue: #005bff;
    --wb-purple: #9b2dff;
    --accent-yellow: #ffcc00;
    --text-main: #1a1d21;
    --text-muted: #6c757d;
    --border-color: #dee2e6;
    --btn-inactive: #e9ecef;
    
    --current-accent: var(--ozon-blue);
}

body.ozon { --current-accent: var(--ozon-blue); }
body.wb { --current-accent: var(--wb-purple); }

body {
    background-color: var(--bg-light);
    color: var(--text-main);
    font-family: 'Inter', -apple-system, sans-serif;
    min-height: 100vh;
    margin: 0;
    display: flex;
    flex-direction: column;
}

.header-nav {
    display: flex;
    background: var(--card-light);
    padding: 10px;
    gap: 10px;
    border-bottom: 1px solid var(--border-color);
}

.nav-btn {
    flex: 1;
    padding: 15px;
    border-radius: 12px;
    text-align: center;
    text-decoration: none;
    font-weight: 700;
    font-size: 1.1rem;
    transition: all 0.2s ease;
    background: var(--btn-inactive);
    color: var(--text-muted);
    border: 1px solid var(--border-color);
}

body.ozon .btn-ozon,
body.wb .btn-wb {
    background: var(--current-accent);
    color: white;
    border-color: var(--current-accent);
}

.nav-btn:hover {
    background: #fff;
    color: var(--text-main);
    border-color: var(--border-color);
}

.wrapper {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.main-card {
    width: 100%;
    max-width: 600px;
    background: var(--card-light);
    padding: 40px;
    border-radius: 24px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
    border: 1px solid var(--border-color);
}

.info-box {
    background: #fff9e6;
    border: 1px solid var(--accent-yellow);
    border-radius: 16px;
    padding: 15px;
    margin-bottom: 30px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.info-icon { font-size: 1.5rem; }
.info-label { display: block; opacity: 0.8; font-size: 0.85rem; }
.info-box span { color: #856404; font-weight: 700; }

.form-group { margin-bottom: 25px; }

.label-text {
    display: block;
    color: var(--text-muted);
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    margin-bottom: 8px;
    letter-spacing: 1px;
}

.input-field {
    width: 100%;
    background: #ffffff;
    border: 2px solid var(--border-color);
    border-radius: 14px;
    padding: 18px;
    color: var(--text-main);
    font-size: 1.6rem;
    font-weight: 700;
    transition: 0.2s;
}

.input-field[type="file"] {
    font-size: 1rem;
    padding: 12px;
    cursor: pointer;
}

.input-field[type="file"]::file-selector-button {
    background: var(--btn-inactive);
    border: none;
    border-radius: 8px;
    padding: 8px 16px;
    margin-right: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: 0.2s;
}

.input-field[type="file"]:hover::file-selector-button {
    background: var(--current-accent);
    color: white;
}

.input-field:focus {
    outline: none;
    border-color: var(--current-accent);
    box-shadow: 0 0 0 4px rgba(0, 0, 0, 0.05);
}

select.input-field {
    cursor: pointer;
    font-size: 1.2rem;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%236c757d' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 15px center;
}

.submit-btn {
    width: 100%;
    background: var(--current-accent);
    color: white;
    border: none;
    padding: 20px;
    border-radius: 14px;
    font-size: 1.4rem;
    font-weight: 800;
    text-transform: uppercase;
    cursor: pointer;
    transition: 0.2s;
}

.submit-btn:hover {
    filter: brightness(1.1);
    transform: translateY(-2px);
}

.input-err {
    color: #dc3545; 
    font-size: 0.8rem; 
    margin-top: 5px;
}

@media (max-width: 576px) {
    .submit-btn {
        font-size: 1.2rem;
    }
}

.back_link {text-decoration: none;}
.back_link:hover {text-decoration: underline;}