.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 40px 20px;
}

.nav-back {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    margin-bottom: 20px;
    font-size: 1rem;
}

.nav-back:hover {
    color: var(--primary-hover);
}

.header {
    text-align: center;
    margin-bottom: 36px;
    padding-bottom: 28px;
    border-bottom: 1px solid var(--border-color);
}

.header-icon {
    font-size: 3rem;
    margin-bottom: 14px;
}

.header h1 {
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 10px;
    letter-spacing: -0.025em;
}

.header p {
    font-size: 1.08rem;
    color: var(--text-secondary);
    max-width: 620px;
    margin: 0 auto;
}

.calculator-card,
.info-card {
    background: var(--bg-article);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 32px;
    margin-bottom: 24px;
    transition: box-shadow 0.2s ease;
}

.calculator-card:hover,
.info-card:hover {
    box-shadow: var(--shadow-md);
}

.card-header {
    display: flex;
    align-items: center;
    margin-bottom: 18px;
    gap: 12px;
}

.card-number {
    background: var(--primary-color);
    color: white;
    width: 36px;
    height: 36px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    font-weight: 700;
    flex-shrink: 0;
}

.card-title {
    font-size: 1.35rem;
    font-weight: 600;
    color: var(--text-primary);
}

.card-description {
    color: var(--text-secondary);
    margin-bottom: 20px;
    font-size: 1rem;
    line-height: 1.7;
}

.mode-select {
    margin-bottom: 22px;
}

.mode-select label,
.input-row label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.mode-select select,
.input-row input {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    font-size: 1rem;
    background: #ffffff;
    color: var(--text-primary);
}

.mode-select select:focus,
.input-row input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.input-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
    margin-bottom: 20px;
}

.input-grid.input-grid-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.mode-panel {
    display: none;
}

.mode-panel.active {
    display: block;
}

.input-hint {
    display: block;
    margin-top: 6px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.btn-calculate {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 12px 28px;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s ease;
}

.btn-calculate:hover {
    background: var(--primary-hover);
}

.summary-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
}

.summary-item {
    background: #ffffff;
    border-radius: 10px;
    padding: 16px 18px;
    border-left: 4px solid var(--primary-color);
}

.summary-label {
    display: block;
    color: var(--text-secondary);
    font-size: 0.92rem;
    margin-bottom: 4px;
}

.summary-value {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
}

.result-section,
.estimate-section,
.table-section {
    display: none;
}

.result-section.show,
.estimate-section.show,
.table-section.show {
    display: block;
}

.estimate-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
}

.estimate-item {
    background: #ffffff;
    border-radius: 10px;
    padding: 16px 18px;
    border-left: 4px solid var(--success-color);
}

.estimate-distance {
    display: block;
    color: var(--text-secondary);
    font-size: 0.92rem;
    margin-bottom: 4px;
}

.estimate-time {
    font-size: 1.15rem;
    font-weight: 700;
}

.table-wrap {
    overflow-x: auto;
    background: #ffffff;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

table {
    width: 100%;
    border-collapse: collapse;
    min-width: 520px;
}

th,
td {
    padding: 14px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    background: var(--bg-light);
    font-size: 0.95rem;
    color: var(--text-primary);
}

td {
    font-size: 0.96rem;
    color: var(--text-secondary);
}

tbody tr:last-child td {
    border-bottom: none;
}

.table-highlight {
    font-weight: 700;
    color: var(--text-primary);
}

.info-card h2 {
    font-size: 1.3rem;
    margin-bottom: 14px;
}

.info-card ul {
    padding-left: 20px;
    color: var(--text-secondary);
}

.info-card li + li {
    margin-top: 8px;
}

@media (max-width: 640px) {
    .container {
        padding: 24px 15px;
    }

    .header h1 {
        font-size: 1.8rem;
    }

    .calculator-card,
    .info-card {
        padding: 22px 18px;
    }

    .input-grid,
    .input-grid.input-grid-3,
    .summary-grid,
    .estimate-grid {
        grid-template-columns: 1fr;
    }
}