* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    padding: 20px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

header {
    text-align: center;
    margin-bottom: 40px;
    padding: 30px 0;
}

header h1 {
    font-size: 2.5rem;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: var(--shadow-lg);
    transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

.card h2 {
    color: var(--text-primary);
    margin-bottom: 25px;
    font-size: 1.75rem;
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 10px;
}

.hidden {
    display: none;
}

/* Форма */
.form-section {
    margin-bottom: 40px;
    padding-bottom: 30px;
    border-bottom: 2px solid var(--border-color);
}

.form-section:last-of-type {
    border-bottom: none;
}

.form-section h3 {
    color: var(--primary-color);
    margin-bottom: 20px;
    font-size: 1.3rem;
    font-weight: 600;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
    margin-bottom: 30px;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.form-group input {
    padding: 12px 15px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s, box-shadow 0.3s;
    width: 100%;
}

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

.input-hint {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 5px;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
    padding: 15px 40px;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.2s;
    width: 100%;
    max-width: 400px;
    margin: 0 auto;
    display: block;
}

.btn-secondary {
    background-color: var(--secondary-color);
    color: white;
    padding: 10px 14px;
    border: none;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: opacity 0.2s, transform 0.2s;
}

.btn-secondary:hover { opacity: 0.9; transform: translateY(-1px); }
.btn-secondary:active { transform: translateY(0); }

.input-with-action { display: flex; gap: 10px; align-items: center; }
.input-with-action input { flex: 1; }

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
}

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

/* Схема расчета */
#scheme-content {
    background: var(--bg-color);
    padding: 20px;
    border-radius: 8px;
    font-family: 'Courier New', monospace;
    line-height: 1.8;
}

.calculation-step {
    margin: 15px 0;
    padding: 15px;
    background: white;
    border-left: 4px solid var(--primary-color);
    border-radius: 4px;
}

.calculation-step .step-title {
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.calculation-step .step-formula {
    color: var(--text-primary);
    margin: 5px 0;
}

.calculation-step .step-result {
    color: var(--success-color);
    font-weight: 600;
    margin-top: 8px;
}

/* Таблица результатов */
#results-table-container {
    overflow-x: auto;
}

.results-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
    box-shadow: var(--shadow);
}

.results-table th,
.results-table td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.results-table th {
    background-color: var(--primary-color);
    color: white;
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 0.5px;
}

.results-table tr:hover {
    background-color: var(--bg-color);
}

.results-table td:last-child {
    font-weight: 600;
    color: var(--primary-color);
}

/* Прогноз */
.scenario-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 25px;
    border-bottom: 2px solid var(--border-color);
}

.tab-btn {
    padding: 12px 25px;
    border: none;
    background: transparent;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-secondary);
    border-bottom: 3px solid transparent;
    transition: all 0.3s;
    margin-bottom: -2px;
}

.tab-btn:hover {
    color: var(--primary-color);
}

.tab-btn.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.scenario-content {
    margin-top: 20px;
}

.scenario-description {
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 20px;
}

.scenario-positive {
    background-color: #d1fae5;
    border-left: 4px solid var(--success-color);
}

.scenario-neutral {
    background-color: #fef3c7;
    border-left: 4px solid var(--warning-color);
}

.scenario-negative {
    background-color: #fee2e2;
    border-left: 4px solid var(--danger-color);
}

.scenario-metrics {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.metric-card {
    background: var(--bg-color);
    padding: 20px;
    border-radius: 8px;
    text-align: center;
}

.metric-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin: 10px 0;
}

.metric-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.chart-container {
    margin-top: 30px;
    height: 400px;
    position: relative;
}

/* Таблицы режимов */
.regimes-detail {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: 30px;
    margin-top: 20px;
}

.regime-group h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
    font-size: 1.2rem;
}

.regimes-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 10px;
    box-shadow: var(--shadow);
}

.regimes-table th,
.regimes-table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.regimes-table th {
    background-color: var(--primary-color);
    color: white;
    font-weight: 600;
    font-size: 0.85rem;
}

.regimes-table tr.subtotal {
    background-color: #f0f9ff;
    font-weight: 600;
}

.regimes-table tr.total {
    background-color: #e0f2fe;
    font-weight: 700;
    font-size: 1.05rem;
}

.regimes-table tr:hover:not(.total):not(.subtotal) {
    background-color: var(--bg-color);
}

footer {
    text-align: center;
    padding: 30px 0;
    color: var(--text-secondary);
    margin-top: 50px;
}

/* Модальное окно коэффициентов */
.modal.hidden { display: none; }
.modal { position: fixed; inset: 0; z-index: 1000; }
.modal-backdrop { position: absolute; inset: 0; background: rgba(0,0,0,0.4); }
.modal-dialog { position: relative; margin: 60px auto; background: #fff; width: min(960px, 92%); border-radius: 12px; box-shadow: var(--shadow-lg); overflow: hidden; }
.modal-header { display: flex; justify-content: space-between; align-items: center; padding: 16px 20px; border-bottom: 1px solid var(--border-color); }
.modal-close { background: transparent; border: none; font-size: 28px; line-height: 1; cursor: pointer; color: var(--text-secondary); }
.modal-tabs { display: flex; gap: 8px; padding: 10px 16px; border-bottom: 1px solid var(--border-color); }
.modal-tab { padding: 10px 14px; border: none; background: transparent; cursor: pointer; font-weight: 600; color: var(--text-secondary); border-bottom: 2px solid transparent; }
.modal-tab.active { color: var(--primary-color); border-bottom-color: var(--primary-color); }
.modal-search { padding: 12px 16px; border-bottom: 1px solid var(--border-color); }
.modal-search input { width: 100%; padding: 10px 12px; border: 2px solid var(--border-color); border-radius: 8px; font-size: 1rem; }
.modal-content { max-height: 50vh; overflow: auto; }
.koef-table { width: 100%; border-collapse: collapse; }
.koef-table th, .koef-table td { padding: 12px 14px; border-bottom: 1px solid var(--border-color); text-align: left; vertical-align: top; }
.koef-table th { background: var(--bg-color); font-weight: 700; color: var(--text-primary); }
.modal-footer { padding: 14px 16px; display: flex; justify-content: flex-end; gap: 10px; }

@media (max-width: 640px) {
  .modal-content { max-height: 60vh; }
}

/* Адаптивность */
@media (max-width: 768px) {
    header h1 {
        font-size: 1.8rem;
    }

    .form-grid {
        grid-template-columns: 1fr;
    }

    .card {
        padding: 20px;
    }

    .scenario-tabs {
        flex-direction: column;
    }

    .tab-btn {
        text-align: left;
        border-left: 3px solid transparent;
        border-bottom: none;
        margin-bottom: 0;
    }

    .tab-btn.active {
        border-left-color: var(--primary-color);
        border-bottom-color: transparent;
    }
}