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

 body {
     min-height: 100vh;
     display: flex;
     justify-content: center;
     align-items: flex-start;
     padding: 30px 20px;
     font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
     background: radial-gradient(ellipse at 30% 20%, #fff5f0, #ffffff 60%, #faf9f8);
     color: #1f2937;
 }

 .page {
     width: 100%;
     max-width: 880px;
 }

 /* ===== КАРТОЧКИ ===== */
 .card {
     background: #ffffff;
     border-radius: 32px;
     border: 1px solid rgba(0, 0, 0, 0.06);
     padding: 40px;
     margin-bottom: 28px;
     transition: all 0.4s ease;
     box-shadow: 0 8px 40px rgba(0, 0, 0, 0.06), 0 2px 8px rgba(0, 0, 0, 0.04);
 }

 .card:hover {
     border-color: rgba(248, 113, 113, 0.25);
     box-shadow: 0 12px 50px rgba(239, 68, 68, 0.08), 0 4px 12px rgba(0, 0, 0, 0.04);
 }

 /* ===== ЗАГОЛОВОК С ИЛЛЮСТРАЦИЕЙ ===== */
 .card-header {
     display: flex;
     align-items: flex-start;
     justify-content: space-between;
     gap: 20px;
     margin-bottom: 24px;
 }

 .card-header-text {
     flex: 1;
     min-width: 0;
 }

 .card h1 {
     font-size: 30px;
     font-weight: 300;
     color: #111827;
     letter-spacing: -0.5px;
     margin-bottom: 6px;
     background: linear-gradient(135deg, #dc2626, #ea580c);
     -webkit-background-clip: text;
     -webkit-text-fill-color: transparent;
     background-clip: text;
     display: inline-block;
 }

 .card h1::after {
     content: '';
     display: block;
     width: 60px;
     height: 3px;
     background: linear-gradient(90deg, #f97316, #ef4444, #dc2626, #b91c1c);
     margin-top: 12px;
     border-radius: 2px;
 }

 .subtitle {
     color: rgba(0, 0, 0, 0.4);
     font-size: 14px;
     margin-bottom: 0;
 }

 /* ===== HERO ИЛЛЮСТРАЦИЯ (компактная) ===== */
 .hero-illustration {
     flex-shrink: 0;
     width: 120px;
     height: 120px;
     position: relative;
     background: linear-gradient(135deg, rgba(248, 113, 113, 0.10), rgba(251, 146, 60, 0.05));
     border-radius: 20px;
     display: flex;
     align-items: center;
     justify-content: center;
     overflow: hidden;
     border: 1px solid rgba(248, 113, 113, 0.15);
 }

 .hero-illustration::before {
     content: '';
     position: absolute;
     width: 100%;
     height: 100%;
     background: radial-gradient(circle at 30% 30%, rgba(248, 113, 113, 0.18), transparent 65%);
 }

 .hero-svg {
     width: 88px;
     height: 88px;
     z-index: 1;
 }

 .heat-wave {
     animation: pulse 2s ease-in-out infinite;
 }

 /* ===== ИКОНКИ В ВЫПАДАЮЩЕМ СПИСКЕ ===== */
 .dropdown li .opt-icon {
     width: 40px;
     height: 40px;
     flex-shrink: 0;
     color: rgba(220, 38, 38, 0.55);
     transition: color 0.15s ease, transform 0.15s ease;
 }

 .dropdown li:hover .opt-icon {
     color: #dc2626;
     transform: scale(1.08);
 }

 .dropdown li.selected .opt-icon {
     color: #dc2626;
 }

 /* Иконка только в закрытом селекте — компактнее */
 .selected-text .opt-icon {
     width: 35px;
     height: 35px;
     flex-shrink: 0;
     border-radius: 3px;
     background: #ffffff;
     box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.06);
 }


 @keyframes pulse {

     0%,
     100% {
         opacity: 0.3;
         transform: translateY(0) scale(1);
     }

     50% {
         opacity: 0.8;
         transform: translateY(-2px) scale(1.05);
     }
 }

 /* ===== РАЗДЕЛЫ (СЕКЦИИ) ===== */
 .form-section {
     margin-bottom: 28px;
 }

 .form-section:last-of-type {
     border-bottom: none;
     margin-bottom: 0;
     padding-bottom: 0;
 }

 .section-title {
     font-size: 14px;
     text-transform: uppercase;
     letter-spacing: 1.2px;
     color: rgba(220, 38, 38, 0.6);
     font-weight: 600;
     margin-bottom: 14px;
     display: flex;
     align-items: center;
     gap: 10px;
 }

 .section-title::after {
     content: '';
     flex: 1;
     height: 1px;
     background: linear-gradient(90deg, rgba(220, 38, 38, 0.15), transparent);
 }

 /* ===== СЕТКА ПОЛЕЙ ===== */
 .grid {
     display: grid;
     grid-template-columns: 1fr 1fr;
     gap: 18px;
 }

 /* ===== ПОЛЯ ВВОДА ===== */
 .field {
     display: flex;
     flex-direction: column;
     gap: 6px;
     position: relative;
 }

 .field>span {
     font-size: 12px;
     text-transform: uppercase;
     letter-spacing: 0.8px;
     color: rgba(220, 38, 38, 0.7);
     font-weight: 600;
     transition: color 0.3s ease;
     padding-left: 2px;
     display: flex;
     align-items: center;
     gap: 6px;
 }

 .field:focus-within>span {
     color: #dc2626;
 }

 .field-icon {
     width: 14px;
     height: 14px;
     flex-shrink: 0;
     opacity: 0.75;
 }

 /* ===== ИНПУТЫ ===== */
 .field input {
     width: 100%;
     padding: 14px 16px;
     background: #f9fafb;
     border: 1.5px solid rgba(0, 0, 0, 0.08);
     border-radius: 14px;
     color: #111827;
     font-size: 16px;
     font-weight: 400;
     font-family: 'Segoe UI', system-ui, sans-serif;
     outline: none;
     transition: all 0.3s ease;
     appearance: none;
     -webkit-appearance: none;
 }

 .field input::placeholder {
     color: rgba(0, 0, 0, 0.25);
     font-weight: 300;
 }

 .field input:focus {
     border-color: #f87171;
     background: rgba(248, 113, 113, 0.03);
     box-shadow: 0 0 0 4px rgba(248, 113, 113, 0.1), 0 2px 8px rgba(248, 113, 113, 0.06);
     transform: translateY(-1px);
 }

 .field input[type="number"]::-webkit-inner-spin-button,
 .field input[type="number"]::-webkit-outer-spin-button {
     opacity: 0.4;
     height: 28px;
 }

 .field input[type="number"] {
     -moz-appearance: textfield;
 }

 /* ===== КАСТОМНЫЙ СЕЛЕКТ ===== */
 .custom-select {
     position: relative;
     display: block;
     width: 100%;
 }

 .select-btn {
     display: flex;
     justify-content: space-between;
     align-items: center;
     width: 100%;
     padding: 14px 16px;
     background: #f9fafb;
     border: 1.5px solid rgba(0, 0, 0, 0.08);
     border-radius: 14px;
     font-family: 'Segoe UI', system-ui, sans-serif;
     font-size: 16px;
     font-weight: 400;
     color: #111827;
     cursor: pointer;
     transition: all 0.3s ease;
     outline: none;
 }

 .select-btn:hover {
     background: #f3f4f6;
     border-color: rgba(248, 113, 113, 0.4);
 }

 .field:focus-within .select-btn {
     border-color: #f87171;
     background: rgba(248, 113, 113, 0.03);
     box-shadow: 0 0 0 4px rgba(248, 113, 113, 0.1), 0 2px 8px rgba(248, 113, 113, 0.06);
     transform: translateY(-1px);
 }

 .selected-text {
     display: flex;
     align-items: center;
     gap: 8px;
     font-weight: 400;
     color: #111827;
 }

 .arrow {
     font-size: 12px;
     transition: transform 0.25s ease;
     color: rgba(220, 38, 38, 0.5);
     line-height: 1;
 }

 .custom-select.open .arrow {
     transform: rotate(180deg);
 }

 /* ===== ВЫПАДАЮЩИЙ СПИСОК ===== */
 .dropdown {
     position: absolute;
     top: calc(100% + 8px);
     left: 0;
     width: 100%;
     background: #ffffff;
     border: 1.5px solid rgba(248, 113, 113, 0.2);
     border-radius: 20px;
     padding: 6px 0;
     margin: 0;
     list-style: none;
     overflow: hidden;
     opacity: 0;
     visibility: hidden;
     transform: scale(0.94) translateY(-6px);
     transition: opacity 0.2s ease, transform 0.2s ease, visibility 0s 0.2s;
     box-shadow: 0 12px 40px rgba(0, 0, 0, 0.1), 0 4px 12px rgba(0, 0, 0, 0.05);
     z-index: 20;
 }

 .custom-select.open .dropdown {
     opacity: 1;
     visibility: visible;
     transform: scale(1) translateY(0);
     transition: opacity 0.2s ease, transform 0.2s ease, visibility 0s 0s;
 }

 .dropdown li {
     display: flex;
     align-items: center;
     gap: 10px;
     padding: 10px 18px;
     font-size: 14px;
     font-weight: 400;
     color: #4b5563;
     cursor: pointer;
     transition: background 0.15s, color 0.15s, padding-left 0.15s;
     border-top: 1px solid rgba(0, 0, 0, 0.04);
 }

 .dropdown li:first-child {
     border-top: none;
 }

 .dropdown li:hover {
     background: rgba(248, 113, 113, 0.08);
     color: #111827;
     padding-left: 24px;
 }

 .dropdown li.selected {
     background: rgba(248, 113, 113, 0.1);
     color: #111827;
     font-weight: 500;
 }

 /* ===== СКРЫТОЕ ПОЛЕ ДЛЯ КОЭФФИЦИЕНТА ===== */
 .field.hidden {
     display: none;
 }

 /* ===== КНОПКИ ===== */
 .actions {
     display: flex;
     gap: 14px;
     margin-top: 28px;
     flex-wrap: wrap;
 }

 .btn {
     padding: 14px 36px;
     border: none;
     border-radius: 14px;
     font-size: 15px;
     font-weight: 600;
     cursor: pointer;
     transition: all 0.3s ease;
     font-family: 'Segoe UI', system-ui, sans-serif;
     letter-spacing: 0.3px;
     display: inline-flex;
     align-items: center;
     justify-content: center;
     gap: 8px;
 }

 .btn.primary {
     background: linear-gradient(135deg, #dc2626, #ea580c);
     color: #ffffff;
     box-shadow: 0 4px 20px rgba(220, 38, 38, 0.3);
     flex: 1;
     position: relative;
     overflow: hidden;
 }

 .btn.primary::before {
     content: '';
     position: absolute;
     top: -50%;
     left: -50%;
     width: 200%;
     height: 200%;
     background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.15), transparent);
     transform: rotate(45deg) translateX(-100%);
     transition: 0.6s;
 }

 .btn.primary:hover::before {
     transform: rotate(45deg) translateX(100%);
 }

 .btn.primary:hover {
     transform: translateY(-2px);
     box-shadow: 0 8px 30px rgba(220, 38, 38, 0.4);
 }

 .btn.primary:active {
     transform: scale(0.98);
 }

 .btn.secondary {
     background: rgba(220, 38, 38, 0.06);
     color: #dc2626;
     border: 1.5px solid rgba(220, 38, 38, 0.15);
 }

 .btn.secondary:hover {
     background: rgba(220, 38, 38, 0.1);
     color: #b91c1c;
     border-color: rgba(220, 38, 38, 0.25);
     box-shadow: 0 4px 16px rgba(220, 38, 38, 0.1);
 }

 .btn-icon {
     width: 18px;
     height: 18px;
 }

 /* ===== ОШИБКА ===== */
 .error {
     color: #dc2626;
     font-size: 13px;
     padding: 12px 16px;
     background: rgba(220, 38, 38, 0.05);
     border-radius: 12px;
     border: 1px solid rgba(220, 38, 38, 0.12);
     margin-top: 12px;
 }

 .error[hidden] {
     display: none;
 }

 /* ===== РЕЗУЛЬТАТЫ ===== */
 #output {
     margin-top: 0;
 }

 #output h2 {
     font-size: 18px;
     font-weight: 300;
     color: #111827;
     margin-bottom: 24px;
     display: inline-flex;
     align-items: center;
     gap: 10px;
 }

 #output h2::after {
     content: '';
     display: block;
     width: 40px;
     height: 3px;
     background: linear-gradient(90deg, #f97316, #ef4444, #dc2626, #b91c1c);
     margin-top: 8px;
     border-radius: 2px;
     margin-left: 10px;
 }

 .title-icon {
     width: 24px;
     height: 24px;
     flex-shrink: 0;
 }

 .result-block {
     background: #f9fafb;
     border-radius: 16px;
     padding: 20px 24px;
     margin-bottom: 16px;
     border: 1px solid rgba(0, 0, 0, 0.04);
     transition: all 0.3s ease;
     position: relative;
 }

 .result-block:hover {
     border-color: rgba(248, 113, 113, 0.15);
     background: rgba(248, 113, 113, 0.03);
 }

 .result-block h3 {
     font-size: 13px;
     text-transform: uppercase;
     letter-spacing: 1px;
     color: rgba(220, 38, 38, 0.7);
     font-weight: 600;
     margin-bottom: 12px;
     display: flex;
     align-items: center;
     gap: 8px;
 }

 .block-icon {
     width: 20px;
     height: 20px;
     flex-shrink: 0;
     transition: transform 0.3s ease;
 }

 .result-block:hover .block-icon {
     transform: scale(1.1) rotate(8deg);
 }

 .result-block dl {
     display: grid;
     grid-template-columns: 1fr 1fr;
     gap: 8px 24px;
 }

 .result-block dl div {
     display: flex;
     justify-content: space-between;
     align-items: center;
     padding: 6px 0;
     border-bottom: 1px solid rgba(0, 0, 0, 0.04);
 }

 .result-block dt {
     color: rgba(0, 0, 0, 0.45);
     font-size: 13px;
     font-weight: 400;
 }

 .result-block dd {
     color: #111827;
     font-size: 15px;
     font-weight: 500;
     text-align: right;
 }

 .totals {
     display: flex;
     justify-content: flex-end;
     padding: 20px 24px;
     background: linear-gradient(135deg, rgba(248, 113, 113, 0.06), rgba(251, 146, 60, 0.04));
     border-radius: 16px;
     border: 1px solid rgba(248, 113, 113, 0.12);
     margin-top: 8px;
     transition: all 0.3s ease;
 }

 .totals:hover {
     border-color: rgba(248, 113, 113, 0.2);
     background: linear-gradient(135deg, rgba(248, 113, 113, 0.08), rgba(251, 146, 60, 0.06));
 }

 .totals>div {
     display: flex;
     align-items: center;
     gap: 20px;
 }

 .totals span {
     color: rgba(220, 38, 38, 0.6);
     font-size: 13px;
     text-transform: uppercase;
     letter-spacing: 1px;
     font-weight: 600;
 }

 .totals strong {
     font-size: 32px;
     font-weight: 300;
     color: #111827;
     font-family: 'SF Mono', 'Segoe UI', monospace;
     background: linear-gradient(135deg, #dc2626, #ea580c);
     -webkit-background-clip: text;
     -webkit-text-fill-color: transparent;
 }

 /* ===== ПОДВАЛ ===== */
 .footnote {
     text-align: center;
     color: rgba(0, 0, 0, 0.4);
     font-size: 11px;
     margin-top: 24px;
     letter-spacing: 0.5px;
 }

 /* ===== АНИМАЦИЯ ===== */
 #output:not([hidden]) {
     animation: fadeSlide 0.5s cubic-bezier(0.4, 0, 0.2, 1);
 }

 @keyframes fadeSlide {
     from {
         opacity: 0;
         transform: translateY(20px);
     }

     to {
         opacity: 1;
         transform: translateY(0);
     }
 }

 /* ===== АДАПТИВ ===== */
 @media (max-width: 768px) {
     .card {
         padding: 24px;
         border-radius: 24px;
     }

     .card-header {
         flex-direction: column-reverse;
         align-items: center;
         text-align: center;
         gap: 14px;
     }

     .card h1::after {
         margin-left: auto;
         margin-right: auto;
     }

     .hero-illustration {
         width: 104px;
         height: 104px;
         border-radius: 18px;
     }

     .hero-svg {
         width: 76px;
         height: 76px;
     }

     .grid {
         grid-template-columns: 1fr;
         gap: 14px;
     }

     .card h1 {
         font-size: 24px;
     }

     .result-block dl {
         grid-template-columns: 1fr;
         gap: 4px;
     }

     .result-block dl div {
         padding: 4px 0;
     }

     .totals {
         flex-direction: column;
         align-items: stretch;
         padding: 16px 20px;
     }

     .totals>div {
         justify-content: space-between;
     }

     .totals strong {
         font-size: 24px;
     }

     .actions {
         flex-direction: column;
     }

     .btn {
         text-align: center;
         padding: 16px;
     }

     .field>span {
         font-size: 11px;
     }
 }

 @media (max-width: 480px) {
     .card {
         padding: 18px;
         border-radius: 20px;
     }

     .hero-illustration {
         width: 92px;
         height: 92px;
         border-radius: 16px;
     }

     .hero-svg {
         width: 68px;
         height: 68px;
     }

     .field input,
     .select-btn {
         padding: 12px 14px;
         font-size: 15px;
     }

     .field>span {
         font-size: 10px;
     }
 }