:root {
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --bg-gradient: linear-gradient(135deg, #0f172a 0%, #1e1b4b 50%, #311042 100%);
    --card-bg: rgba(255, 255, 255, 0.95);
    --text-main: #1e293b;
    --text-muted: #64748b;
    --accent-green: #10b981;
}

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

.center-wrapper {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 40px 20px;
}

.expert-card {
    background: var(--card-bg);
    backdrop-filter: blur(16px);
    border-radius: 24px;
    padding: 40px;
    max-width: 600px;
    width: 100%;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.35);
    border: 1px solid rgba(255, 255, 255, 0.2);
    animation: fadeIn 0.6s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.header-badge {
    display: inline-block;
    padding: 6px 14px;
    background: #e0e7ff;
    color: var(--primary-color);
    border-radius: 20px;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    margin-bottom: 12px;
}

h1 {
    font-size: 28px;
    font-weight: 800;
    margin: 0 0 8px 0;
    color: #0f172a;
}

.subtitle {
    color: var(--text-muted);
    font-size: 15px;
    margin-bottom: 28px;
    line-height: 1.5;
}

.form-group {
    margin-bottom: 22px;
}

label {
    display: block;
    font-weight: 600;
    font-size: 14px;
    margin-bottom: 8px;
    color: #334155;
}

.custom-select {
    width: 100%;
    padding: 14px 16px;
    border-radius: 12px;
    border: 1.5px solid #e2e8f0;
    background-color: #f8fafc;
    font-size: 15px;
    color: var(--text-main);
    outline: none;
    transition: all 0.2s ease;
    cursor: pointer;
}

.custom-select:focus {
    border-color: var(--primary-color);
    background-color: #fff;
    box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.15);
}

/* Радио-кнопки в виде переключаемых карточек */
.radio-cards {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-top: 6px;
}

.radio-card-label {
    position: relative;
}

.radio-card-label input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
}

.card-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 12px;
    background: #f8fafc;
    border: 1.5px solid #e2e8f0;
    border-radius: 12px;
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.radio-card-label input:checked + .card-btn {
    border-color: var(--primary-color);
    background: #eeef2f3;
    color: var(--primary-color);
    box-shadow: 0 0 0 2px var(--primary-color);
}

.btn-submit {
    width: 100%;
    padding: 16px;
    background: linear-gradient(135deg, var(--primary-color), #6366f1);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 10px 20px -5px rgba(79, 70, 229, 0.4);
    margin-top: 10px;
}

.btn-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 25px -5px rgba(79, 70, 229, 0.5);
}

.btn-submit:active {
    transform: translateY(0);
}

/* Блок результатов (Explanation Facility) */
#result-box {
    margin-top: 30px;
    padding: 24px;
    background: #ecfdf5;
    border: 1.5px solid #a7f3d0;
    border-radius: 16px;
    display: none;
    animation: slideUp 0.4s ease-out;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(15px); }
    to { opacity: 1; transform: translateY(0); }
}

.res-header {
    display: flex;
    align-items: center;
    gap: 8px;
    color: #065f46;
    font-size: 13px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.res-title {
    font-size: 20px;
    font-weight: 800;
    color: #047857;
    margin: 8px 0 14px 0;
}

.explanation-card {
    background: rgba(255, 255, 255, 0.7);
    padding: 14px 18px;
    border-radius: 10px;
    font-size: 14px;
    color: #064e3b;
    line-height: 1.6;
}