/* ============================================================
   Калькулятор огнестойких проходок — ST Electric
   ============================================================ */

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

.calc-wrapper {
    max-width: 1200px;
    margin: 20px auto;
    background: #fff;
    border-radius: 16px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    padding: 30px;
    font-family: 'Segoe UI', Roboto, Arial, sans-serif;
    color: #1e2a3a;
    line-height: 1.5;
}

.calc-wrapper h1 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 8px;
    color: #0a1e2f;
}

.calc-wrapper .subtitle {
    font-size: 14px;
    color: #5a6b7a;
    margin-bottom: 24px;
}

/* ============ ВКЛАДКИ ============ */
.calc-wrapper .tabs {
    display: flex;
    gap: 32px;
    border-bottom: 2px solid #e2e8f0;
    margin-bottom: 28px;
    flex-wrap: wrap;
}

.calc-wrapper .tab-btn {
    background: transparent;
    border: none;
    border-bottom: 3px solid transparent;
    font-family: inherit;
    font-size: 16px;
    font-weight: 500;
    color: #5a6b7a;
    cursor: pointer;
    padding: 10px 0 12px;
    margin-bottom: -2px;
    transition: color 0.2s ease-in-out, border-color 0.2s ease-in-out;
    position: relative;
    display: inline-block;
}

.calc-wrapper .tab-btn:hover { color: rgb(254, 107, 18); }

.calc-wrapper .tab-btn.active {
    color: rgb(254, 107, 18);
    border-bottom-color: rgb(254, 107, 18);
    font-weight: 600;
}

.calc-wrapper .tab-content { display: none; animation: fadeIn 0.25s ease; }
.calc-wrapper .tab-content.active { display: block; }

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(6px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ============ ФОРМЫ ============ */
.calc-wrapper .form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 24px;
}

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

.calc-wrapper .form-group label {
    font-size: 13px;
    font-weight: 500;
    color: #3a4a5a;
    margin-bottom: 6px;
}

.calc-wrapper .form-group input,
.calc-wrapper .form-group select {
    padding: 10px 14px;
    font-size: 15px;
    border: 1.5px solid #d0d9e2;
    border-radius: 8px;
    background: #fafbfc;
    transition: border-color 0.2s, background 0.2s;
    outline: none;
    font-family: inherit;
}

.calc-wrapper .form-group select {
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3e%3cpath fill='%235a6b7a' d='M6 8L0 0h12z'/%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 14px center;
    padding-right: 36px;
    cursor: pointer;
}

.calc-wrapper .form-group input:focus,
.calc-wrapper .form-group select:focus {
    border-color: rgb(254, 107, 18);
    background-color: #fff;
}

.calc-wrapper .form-group input[readonly] {
    background: #f0f2f5;
    color: #5a6b7a;
    cursor: not-allowed;
    border-color: #e2e8f0;
}

.calc-wrapper .form-group input[readonly]:focus {
    border-color: #e2e8f0;
    background: #f0f2f5;
}

/* ============ ВАЛИДАЦИЯ ============ */
.calc-wrapper input.input-error {
    border-color: #e63946 !important;
    background-color: #fdf0f1 !important;
    color: #c1121f;
}

.calc-wrapper input.input-error:focus {
    border-color: #e63946 !important;
    box-shadow: 0 0 0 3px rgba(230, 57, 70, 0.15);
}

.calc-wrapper .field-error {
    display: block;
    font-size: 11px;
    color: #e63946;
    margin-top: 4px;
    font-weight: 500;
    min-height: 14px;
}

.calc-wrapper .form-hint {
    font-size: 11px;
    color: #9aa8b5;
    margin-top: 4px;
    font-style: italic;
}

.calc-wrapper .form-group input[type="number"] { -moz-appearance: textfield; }
.calc-wrapper .form-group input[type="number"]::-webkit-outer-spin-button,
.calc-wrapper .form-group input[type="number"]::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

/* ============ ВАРИАНТЫ ПРОХОДОК ============ */
.calc-wrapper .variants-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 28px 0 12px;
    gap: 12px;
    flex-wrap: wrap;
}

.calc-wrapper .variants-header h3 {
    font-size: 16px;
    font-weight: 600;
    color: #0a1e2f;
}

.calc-wrapper .btn-add {
    background: rgb(254, 107, 18);
    min-width: 114px;
    position: relative;
    display: inline-block;
    box-sizing: border-box;
    font-family: inherit;
    font-size: 14px;
    line-height: 18px;
    text-align: center;
    color: rgb(255, 255, 255);
    cursor: pointer;
    padding: 6px 8px 4px;
    border-width: 1px;
    border-style: solid;
    border-color: transparent;
    border-image: none;
    border-radius: 4px;
    transition: background 0.2s ease-in-out, border 0.2s ease-in-out;
    text-decoration: none;
}

.calc-wrapper .btn-add:hover { background: rgb(224, 87, 8); }

.calc-wrapper .variant-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 10px;
    align-items: start;
    padding: 14px 16px;
    background: #f8fafc;
    border: 1px solid #e2e8f0;
    border-radius: 10px;
    margin-bottom: 10px;
    position: relative;
}

.calc-wrapper .variant-row .form-group { margin-bottom: 0; }

.calc-wrapper .variant-row .form-group label {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.3px;
    color: #7a8a9a;
}

.calc-wrapper .variant-row .form-group input {
    padding: 8px 10px;
    font-size: 14px;
}

.calc-wrapper .btn-remove {
    position: absolute;
    top: -8px;
    right: -8px;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: #e63946;
    color: #fff;
    border: 2px solid #fff;
    font-size: 14px;
    line-height: 1;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
    font-family: inherit;
    padding: 0;
}

.calc-wrapper .btn-remove:hover { background: #c1121f; }

/* ============ РЕЗУЛЬТАТЫ ============ */
.calc-wrapper .results {
    margin-top: 28px;
    padding: 20px 24px;
    background: #f0f7ff;
    border: 1.5px solid #b8d4f0;
    border-radius: 12px;
}

.calc-wrapper .results h3 {
    font-size: 16px;
    font-weight: 600;
    color: #0a1e2f;
    margin-bottom: 14px;
}

.calc-wrapper .results-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

.calc-wrapper .results-table th {
    text-align: left;
    font-weight: 600;
    color: #3a4a5a;
    padding: 8px 12px;
    border-bottom: 2px solid #b8d4f0;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.calc-wrapper .results-table td {
    padding: 10px 12px;
    border-bottom: 1px solid #dce8f5;
    color: #1e2a3a;
}

.calc-wrapper .results-table tr:last-child td { border-bottom: none; }
.calc-wrapper .results-table .value { font-weight: 600; color: #0a1e2f; }
.calc-wrapper .results-table .unit  { color: #7a8a9a; font-size: 13px; }

.calc-wrapper .note {
    margin-top: 12px;
    font-size: 13px;
    color: #7a8a9a;
    font-style: italic;
}

/* ============ АДАПТИВ ============ */
@media (max-width: 768px) {
    .calc-wrapper { padding: 18px; margin: 10px auto; }
    .calc-wrapper .form-grid { grid-template-columns: 1fr; }
    .calc-wrapper .variant-row { grid-template-columns: 1fr 1fr; }
    .calc-wrapper .tabs { gap: 20px; }
    .calc-wrapper .tab-btn { font-size: 14px; padding: 8px 0 10px; }
    .calc-wrapper h1 { font-size: 20px; }
}

@media (max-width: 480px) {
    .calc-wrapper .variant-row { grid-template-columns: 1fr; }
    .calc-wrapper .tabs { gap: 14px; }
    .calc-wrapper .tab-btn { font-size: 13px; }
}