:root {
    --primary: #0056b3;
    --secondary: #00a0e9;
    --accent: #ffc107;
    --dark: #333;
    --light: #f8f9fa;
    --light-blue: #e6f7ff;
    --light-yellow: #fff8e6;
    --success: #28a745;
    --danger: #dc3545;
    --gray: #6c757d;
    --light-gray: #e9ecef;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: 'Roboto', sans-serif;
    color: var(--dark);
    background: var(--light);
    line-height: 1.6;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

.calculator-hero {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    padding: 64px 0;
}

.calculator-hero h1 {
    max-width: 840px;
    margin: 0 0 18px;
    font-size: 2.4rem;
    line-height: 1.2;
}

.calculator-hero p {
    max-width: 760px;
    margin: 0;
    font-size: 1.16rem;
    opacity: 0.95;
}

.breadcrumbs {
    background: var(--light-gray);
    padding: 12px 0;
    font-size: 0.9rem;
}

.breadcrumbs a {
    color: var(--primary);
    text-decoration: none;
}

.breadcrumbs span {
    color: var(--gray);
}

.section {
    padding: 56px 0;
}

.section-alt {
    background: var(--light-blue);
}

.section-title {
    color: var(--primary);
    font-size: 2rem;
    margin: 0 0 24px;
    text-align: center;
}

.section-intro {
    max-width: 820px;
    margin: -10px auto 30px;
    color: var(--gray);
    text-align: center;
}

.calculator-shell {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 360px;
    gap: 24px;
    align-items: start;
}

.calculator-panel,
.result-panel,
.info-card {
    border: 1px solid var(--light-gray);
    border-radius: 8px;
    background: white;
    box-shadow: 0 4px 16px rgba(0,0,0,0.06);
}

.calculator-panel,
.result-panel {
    padding: 24px;
}

.calculator-form {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
}

.mode-field {
    grid-column: 1 / -1;
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin: 0;
    padding: 16px;
    border: 1px solid var(--light-gray);
    border-radius: 8px;
    background: var(--light);
}

.mode-field legend {
    padding: 0 6px;
    color: var(--primary);
    font-weight: 800;
}

.mode-field label {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    min-height: 38px;
    padding: 8px 12px;
    border: 1px solid var(--light-gray);
    border-radius: 999px;
    background: white;
    cursor: pointer;
    font-weight: 700;
}

.mode-field input {
    width: auto;
    min-height: 0;
}

.mode-field small {
    flex-basis: 100%;
    color: var(--gray);
}

.field {
    display: grid;
    gap: 8px;
}

.field label {
    font-weight: 700;
}

.field input {
    width: 100%;
    min-height: 44px;
    padding: 10px 12px;
    border: 1px solid var(--light-gray);
    border-radius: 6px;
    font: inherit;
}

.field input:focus {
    border-color: var(--primary);
    outline: 2px solid rgba(0, 86, 179, 0.16);
}

.field small {
    color: var(--gray);
}

.result-panel {
    position: sticky;
    top: 92px;
}

.result-grid {
    display: grid;
    gap: 14px;
}

.result-item {
    padding: 14px;
    border-radius: 8px;
    background: var(--light);
    border: 1px solid var(--light-gray);
}

.result-item span {
    display: block;
    color: var(--gray);
    font-size: 0.88rem;
}

.result-item strong {
    display: block;
    margin-top: 4px;
    color: var(--primary);
    font-size: 1.35rem;
}

.status {
    margin-top: 16px;
    padding: 14px;
    border-radius: 8px;
    background: var(--light-yellow);
    border-left: 4px solid var(--accent);
    font-weight: 700;
}

.status.good {
    background: #eaf8ee;
    border-left-color: var(--success);
}

.status.risk {
    background: #fff2f2;
    border-left-color: var(--danger);
}

.note {
    margin-top: 14px;
    color: var(--gray);
    font-size: 0.92rem;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
}

.info-card {
    padding: 22px;
}

.info-card h3 {
    color: var(--primary);
    margin: 0 0 10px;
}

.link-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
}

.link-card {
    display: block;
    padding: 18px;
    border: 1px solid var(--light-gray);
    border-radius: 8px;
    background: white;
    color: var(--dark);
    text-decoration: none;
    box-shadow: 0 3px 10px rgba(0,0,0,0.05);
    transition: transform 0.3s, box-shadow 0.3s;
}

.link-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0,0,0,0.1);
}

.link-card strong {
    display: block;
    color: var(--primary);
    margin-bottom: 6px;
}

@media (max-width: 860px) {
    .calculator-shell,
    .calculator-form,
    .info-grid,
    .link-grid {
        grid-template-columns: 1fr;
    }

    .result-panel {
        position: static;
    }

    .calculator-hero h1 {
        font-size: 2rem;
    }
}