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

:root {
    --primary-color: #1a237e;
    --secondary-color: #283593;
    --accent-color: #3949ab;
    --highlight-color: #534bae;
    --text-color: #ffffff;
    --text-secondary: #b0b0b0;
    --success-color: #4caf50;
    --success-light: #66bb6a;
    --border-radius: 16px;
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    --transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #0d1125 0%, #1a237e 50%, #283593 100%);
    min-height: 100vh;
    color: var(--text-color);
    padding: 15px;
    line-height: 1.6;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
}

header {
    text-align: center;
    margin-bottom: 30px;
    animation: fadeInDown 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    text-shadow: 3px 3px 8px rgba(0, 0, 0, 0.4);
    margin-bottom: 12px;
    background: linear-gradient(135deg, #ffffff 0%, #e3f2fd 50%, #ffffff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.price-display {
    background: linear-gradient(135deg, rgba(13, 17, 37, 0.95) 0%, rgba(26, 35, 126, 0.95) 100%);
    border-radius: var(--border-radius);
    padding: 30px 25px;
    text-align: center;
    margin-bottom: 30px;
    box-shadow: var(--shadow);
    border: 1px solid rgba(57, 73, 171, 0.3);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 20px;
    z-index: 100;
    animation: fadeInUp 0.6s cubic-bezier(0.4, 0, 0.2, 1) 0.2s both;
}

.price-label {
    font-size: 1.15rem;
    color: var(--text-secondary);
    margin-bottom: 10px;
    letter-spacing: 0.5px;
}

.price-value {
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--success-color);
    text-shadow: 3px 3px 12px rgba(76, 175, 80, 0.4);
    transition: var(--transition);
}

.price-value:hover {
    color: var(--success-light);
    text-shadow: 4px 4px 16px rgba(76, 175, 80, 0.5);
    transform: scale(1.02);
}

.calculator {
    display: grid;
    gap: 25px;
}

.calculator-section {
    background: linear-gradient(135deg, rgba(21, 27, 51, 0.95) 0%, rgba(26, 35, 126, 0.95) 100%);
    border-radius: var(--border-radius);
    padding: 28px;
    box-shadow: var(--shadow);
    border: 1px solid rgba(57, 73, 171, 0.2);
    transition: var(--transition);
    animation: fadeInUp 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.calculator-section:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
    border-color: rgba(83, 75, 174, 0.4);
}

.calculator-section h2 {
    font-size: 1.4rem;
    margin-bottom: 20px;
    color: var(--text-color);
    border-bottom: 1px solid rgba(83, 75, 174, 0.3);
    padding-bottom: 12px;
    display: flex;
    align-items: center;
    transition: var(--transition);
}

.calculator-section h2:hover {
    color: var(--highlight-color);
}

/* Стили для иконок FontAwesome в заголовках */
.calculator-section h2 i {
    color: var(--accent-color);
    font-size: 1.2rem;
    margin-right: 12px;
    text-shadow: 0 0 6px rgba(57, 73, 171, 0.4);
    transition: var(--transition);
}

.calculator-section h2:hover i {
    color: var(--highlight-color);
    text-shadow: 0 0 10px rgba(83, 75, 174, 0.6);
    transform: scale(1.15);
}

/* Стили для иконок FontAwesome в чекбоксах */
.checkbox-label i {
    margin-right: 10px;
    color: var(--accent-color);
    font-size: 1.1rem;
    transition: var(--transition);
}

.checkbox-label:hover i {
    color: var(--success-color);
    transform: scale(1.1);
}

/* Стили для иконок FontAwesome в радиокнопках */
.fixation-group .radio-label i {
    margin-right: 12px;
    color: var(--accent-color);
    font-size: 1.1rem;
    transition: var(--transition);
}

.fixation-group .radio-label:hover i {
    color: var(--success-color);
    transform: scale(1.1);
}

/* Стили для иконок FontAwesome в кнопках управления */
.area-btn i, .perimeter-btn i {
    font-size: 1.2rem;
    transition: var(--transition);
}

.area-btn:hover i, .perimeter-btn:hover i {
    transform: scale(1.2);
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.3));
}

/* Стили для иконок FontAwesome в selects */
.material-selector-container i, .profile-selector-container i {
    margin-right: 10px;
    color: var(--accent-color);
    font-size: 1.1rem;
    transition: var(--transition);
}

.material-selector-container:hover i, .profile-selector-container:hover i {
    color: var(--highlight-color);
}

.material-selector-container {
    margin-bottom: 20px;
}

.material-selector-container label {
    display: block;
    margin-bottom: 10px;
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.material-selector-container select {
    width: 100%;
    padding: 14px 20px;
    border-radius: 12px;
    border: 2px solid rgba(57, 73, 171, 0.4);
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-color);
    font-size: 1rem;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    cursor: pointer;
    transition: var(--transition);
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 12 12'%3E%3Cpath fill='%23b0b0b0' d='M6 8.825L1.175 4 0 5.175 6 11.175 12 5.175 10.825 4z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 16px center;
    background-size: 14px;
}

.material-selector-container select:hover {
    border-color: var(--highlight-color);
    background: rgba(255, 255, 255, 0.08);
}

.material-selector-container select:focus {
    outline: none;
    border-color: var(--success-color);
    box-shadow: 0 0 0 4px rgba(76, 175, 80, 0.2);
    transform: scale(1.01);
}

.material-selector-container select option {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-color);
    padding: 10px 14px;
}

.material-selector-container select option:hover {
    background: rgba(57, 73, 171, 0.3);
}

.slider-group {
    margin-bottom: 20px;
}

.info-text {
    margin-top: 28px;
    margin-bottom: 22px;
    padding: 16px 18px;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 10px;
    border-left: 3px solid var(--accent-color);
}

/* Стили для управления площадью */
.area-controls {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 16px;
    margin-bottom: 18px;
}

.area-btn {
    width: 48px;
    height: 48px;
    border: none;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--accent-color), var(--highlight-color));
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    position: relative;
    overflow: hidden;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
}

.area-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0));
    opacity: 0;
    transition: var(--transition);
}

.area-btn:hover::before {
    opacity: 1;
}

.area-btn:hover {
    transform: scale(1.08);
    box-shadow: 0 6px 16px rgba(83, 75, 174, 0.5);
}

.area-btn:active {
    transform: scale(0.96);
}

.area-btn svg {
    fill: none;
    stroke: #ffffff;
    stroke-width: 2.5;
    stroke-linecap: round;
    stroke-linejoin: round;
    transition: var(--transition);
}

.area-btn:hover svg {
    stroke: #e3f2fd;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.3));
}

.area-btn.area-btn-minus svg {
    transform: rotate(0deg);
}

.area-btn.area-btn-plus svg {
    transform: rotate(0deg);
}

.area-btn:hover.area-btn-minus svg {
    transform: rotate(0deg) scale(1.15);
}

.area-btn:hover.area-btn-plus svg {
    transform: rotate(0deg) scale(1.15);
}

.area-input {
    flex: 1;
    min-width: 120px;
    max-width: 200px;
    padding: 14px 16px;
    border-radius: 12px;
    border: 2px solid rgba(57, 73, 171, 0.4);
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-color);
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
    transition: var(--transition);
    touch-action: manipulation;
}

.area-input:hover {
    border-color: var(--highlight-color);
    background: rgba(255, 255, 255, 0.08);
}

.area-input:focus {
    outline: none;
    border-color: var(--success-color);
    box-shadow: 0 0 0 4px rgba(76, 175, 80, 0.2);
    background: rgba(255, 255, 255, 0.1);
    transform: scale(1.01);
}

.info-text p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.slider-group label {
    display: block;
    margin-bottom: 10px;
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.slider-group span {
    color: var(--success-color);
    font-weight: 700;
    font-size: 1.1rem;
}

input[type="range"] {
    width: 100%;
    height: 10px;
    border-radius: 10px;
    background: linear-gradient(90deg, var(--accent-color), var(--highlight-color));
    outline: none;
    -webkit-appearance: none;
    transition: var(--transition);
}

input[type="range"]:focus {
    box-shadow: 0 0 0 4px rgba(57, 73, 171, 0.3);
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--success-color);
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
    border: 3px solid rgba(255, 255, 255, 0.2);
    touch-action: manipulation;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.25);
    box-shadow: 0 6px 16px rgba(76, 175, 80, 0.5);
}

input[type="range"]::-webkit-slider-thumb:active {
    transform: scale(1.15);
}

input[type="range"]::-webkit-slider-runnable-track {
    width: 100%;
    height: 10px;
    cursor: pointer;
    border-radius: 10px;
}

input[type="range"]::-moz-range-thumb {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--success-color);
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
    border: 3px solid rgba(255, 255, 255, 0.2);
    touch-action: manipulation;
}

input[type="range"]::-moz-range-thumb:hover {
    transform: scale(1.25);
}

input[type="range"]::-moz-range-track {
    width: 100%;
    height: 10px;
    cursor: pointer;
    border-radius: 10px;
    background: linear-gradient(90deg, var(--accent-color), var(--highlight-color));
}

input[type="range"]::-ms-thumb {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--success-color);
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
    border: 3px solid rgba(255, 255, 255, 0.2);
    touch-action: manipulation;
}

input[type="range"]::-ms-thumb:hover {
    transform: scale(1.25);
}

input[type="range"]::-ms-track {
    width: 100%;
    height: 10px;
    cursor: pointer;
    background: transparent;
    border-color: transparent;
}

input[type="range"]::-ms-fill-lower {
    background: linear-gradient(90deg, var(--accent-color), var(--highlight-color));
    border-radius: 10px;
}

input[type="range"]::-ms-fill-upper {
    background: #283593;
    border-radius: 10px;
}

.checkbox-group {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 14px;
}

.checkbox-label {
    display: flex;
    align-items: center;
    padding: 14px 16px;
    background: rgba(255, 255, 255, 0.04);
    border-radius: 12px;
    cursor: pointer;
    transition: var(--transition);
    border: 1px solid rgba(57, 73, 171, 0.2);
    position: relative;
    overflow: hidden;
    touch-action: manipulation;
}

.checkbox-label::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--success-color);
    transform: scaleY(0);
    transition: var(--transition);
    transform-origin: top;
}

.checkbox-label:hover {
    background: rgba(255, 255, 255, 0.08);
    transform: translateX(4px);
    border-color: rgba(83, 75, 174, 0.4);
}

.checkbox-label:hover::before {
    transform: scaleY(1);
}

/* Стили для чекбоксов во всех разделах (единый стиль) */
input[type="checkbox"] {
    width: 20px;
    height: 20px;
    margin-right: 14px;
    cursor: pointer;
    accent-color: var(--success-color);
    transition: var(--transition);
    border-radius: 50%;
    position: relative;
    touch-action: manipulation;
}

input[type="checkbox"]:checked {
    background: var(--success-color);
    transform: scale(1.1);
}

input[type="checkbox"]:checked + span {
    color: var(--success-color);
    font-weight: 600;
    letter-spacing: 0.3px;
}

/* Стили для текста чекбоксов */
.checkbox-label span {
    font-size: 0.95rem;
    color: var(--text-secondary);
    transition: var(--transition);
}

/* Стили для радиокнопок в разделе крепления */
.fixation-group .radio-label input[type="radio"] {
    width: 22px;
    height: 22px;
    margin-right: 18px;
    accent-color: var(--success-color);
    cursor: pointer;
    transition: var(--transition);
    touch-action: manipulation;
}

.fixation-group .radio-label span {
    font-size: 1.05rem;
    font-weight: 500;
}

/* Стили для выбора профиля */
.profile-selector-container {
    margin-bottom: 20px;
}

.profile-selector-container label {
    display: block;
    margin-bottom: 10px;
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.profile-selector-container select {
    width: 100%;
    padding: 14px 20px;
    border-radius: 12px;
    border: 2px solid rgba(57, 73, 171, 0.4);
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-color);
    font-size: 1rem;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    cursor: pointer;
    transition: var(--transition);
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 12 12'%3E%3Cpath fill='%23b0b0b0' d='M6 8.825L1.175 4 0 5.175 6 11.175 12 5.175 10.825 4z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 16px center;
    background-size: 14px;
}

.profile-selector-container select:hover {
    border-color: var(--highlight-color);
    background: rgba(255, 255, 255, 0.08);
}

.profile-selector-container select:focus {
    outline: none;
    border-color: var(--success-color);
    box-shadow: 0 0 0 4px rgba(76, 175, 80, 0.2);
    transform: scale(1.01);
}

.profile-selector-container select option {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-color);
    padding: 10px 14px;
}

.profile-selector-container select option:hover {
    background: rgba(57, 73, 171, 0.3);
}

/* Стили для управления периметром */
.perimeter-controls {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 16px;
    margin-bottom: 18px;
}

.perimeter-btn {
    width: 48px;
    height: 48px;
    border: none;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--accent-color), var(--highlight-color));
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    position: relative;
    overflow: hidden;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
}

.perimeter-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0));
    opacity: 0;
    transition: var(--transition);
}

.perimeter-btn:hover::before {
    opacity: 1;
}

.perimeter-btn:hover {
    transform: scale(1.08);
    box-shadow: 0 6px 16px rgba(83, 75, 174, 0.5);
}

.perimeter-btn:active {
    transform: scale(0.96);
}

.perimeter-btn svg {
    fill: none;
    stroke: #ffffff;
    stroke-width: 2.5;
    stroke-linecap: round;
    stroke-linejoin: round;
    transition: var(--transition);
}

.perimeter-btn:hover svg {
    stroke: #e3f2fd;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.3));
}

.perimeter-btn.perimeter-btn-minus svg {
    transform: rotate(0deg);
}

.perimeter-btn.perimeter-btn-plus svg {
    transform: rotate(0deg);
}

.perimeter-btn:hover.perimeter-btn-minus svg {
    transform: rotate(0deg) scale(1.15);
}

.perimeter-btn:hover.perimeter-btn-plus svg {
    transform: rotate(0deg) scale(1.15);
}

.perimeter-input {
    flex: 1;
    min-width: 120px;
    max-width: 200px;
    padding: 14px 16px;
    border-radius: 12px;
    border: 2px solid rgba(57, 73, 171, 0.4);
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-color);
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
    transition: var(--transition);
    touch-action: manipulation;
}

.perimeter-input:hover {
    border-color: var(--highlight-color);
    background: rgba(255, 255, 255, 0.08);
}

.perimeter-input:focus {
    outline: none;
    border-color: var(--success-color);
    box-shadow: 0 0 0 4px rgba(76, 175, 80, 0.2);
    background: rgba(255, 255, 255, 0.1);
    transform: scale(1.01);
}


/* Анимации */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.calculator-section {
    animation: fadeInUp 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.calculator-section:nth-child(1) { animation-delay: 0.1s; }
.calculator-section:nth-child(2) { animation-delay: 0.2s; }
.calculator-section:nth-child(3) { animation-delay: 0.3s; }
.calculator-section:nth-child(4) { animation-delay: 0.4s; }
.calculator-section:nth-child(5) { animation-delay: 0.5s; }
.calculator-section:nth-child(6) { animation-delay: 0.6s; }

/* Плавные анимации для цены */
.price-value {
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Адаптивность для планшетов */
@media (max-width: 992px) {
    .container {
        max-width: 95%;
    }
    
    header h1 {
        font-size: 2.2rem;
    }
    
    .price-value {
        font-size: 3rem;
    }
    
    .calculator-section {
        padding: 24px;
    }
}

/* Адаптивность для мобильных */
@media (max-width: 768px) {
    body {
        padding: 10px;
    }
    
    .container {
        padding: 0;
    }
    
    header h1 {
        font-size: 1.8rem;
    }
    
    .price-display {
        padding: 24px 20px;
        top: 15px;
    }
    
    .price-value {
        font-size: 2.5rem;
    }
    
    .calculator-section {
        padding: 20px;
    }
    
    .calculator-section h2 {
        font-size: 1.2rem;
    }
    
    .checkbox-group {
        grid-template-columns: 1fr;
    }
    
    .slider-group {
        margin-bottom: 16px;
    }
    
    .slider-group label {
        font-size: 0.95rem;
    }
    
    /* Адаптация для кнопок управления на мобильных */
    .area-btn,
    .perimeter-btn {
        width: 44px;
        height: 44px;
    }
    
    .area-input,
    .perimeter-input {
        min-width: 100px;
    }
    
    /* Улучшенные ползунки для мобильных устройств */
    input[type="range"] {
        height: 12px;
    }
    
    input[type="range"]::-webkit-slider-thumb {
        width: 36px;
        height: 36px;
    }
    
    input[type="range"]::-moz-range-thumb {
        width: 36px;
        height: 36px;
    }
    
    input[type="range"]::-ms-thumb {
        width: 36px;
        height: 36px;
    }
}

/* Адаптивность для маленьких экранов */
@media (max-width: 480px) {
    .price-display {
        padding: 20px 16px;
        margin-bottom: 20px;
    }
    
    .price-label {
        font-size: 1rem;
    }
    
    .price-value {
        font-size: 2rem;
    }
    
    .calculator-section {
        padding: 16px;
    }
    
    .calculator {
        gap: 20px;
    }
    
    .slider-group span {
        font-size: 1rem;
    }
    
    .checkbox-label {
        padding: 12px 14px;
    }
    
    .checkbox-label span {
        font-size: 0.9rem;
    }
    
    input[type="range"] {
        height: 12px;
    }
    
    input[type="range"]::-webkit-slider-thumb {
        width: 36px;
        height: 36px;
    }
    
    input[type="range"]::-moz-range-thumb {
        width: 36px;
        height: 36px;
    }
    
    input[type="range"]::-ms-thumb {
        width: 36px;
        height: 36px;
    }
    
    /* Адаптация для кнопок управления на очень маленьких экранах */
    .area-btn,
    .perimeter-btn {
        width: 40px;
        height: 40px;
    }
    
    .area-btn svg,
    .perimeter-btn svg {
        width: 18px;
        height: 18px;
        stroke-width: 2;
    }
    
    .area-input,
    .perimeter-input {
        min-width: 90px;
        font-size: 0.9rem;
    }
}