/* Стили для калькуляторов */

.calculator {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    margin-bottom: 2.5rem;
    box-shadow: var(--shadow);
    position: relative;
    overflow: hidden;
}

.calculator::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color), var(--primary-color));
    background-size: 200% 100%;
    animation: gradient-shift 3s ease infinite;
}

@keyframes gradient-shift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.calculator-title {
    margin-bottom: 1.5rem;
    font-size: 1.75rem;
}

.calculator-description {
    color: var(--text-light);
    margin-bottom: 1.5rem;
    font-size: 0.9375rem;
}

/* Формы */
.calculator-form {
    margin-bottom: 2rem;
}

.form-group {
    margin-bottom: 1.75rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-color);
}

.form-input {
    width: 100%;
    padding: 0.875rem 1.25rem;
    font-size: 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    background: rgba(36, 52, 71, 0.6);
    color: var(--text-bright);
    transition: var(--transition);
    min-height: 44px;
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(77, 166, 255, 0.15), var(--glow);
    background: rgba(36, 52, 71, 0.9);
}

.form-input::placeholder {
    color: var(--text-light);
    opacity: 0.6;
}

.form-input:invalid {
    border-color: var(--danger-color);
}

.form-input:valid {
    border-color: var(--success-color);
}

.form-input.error {
    border-color: var(--danger-color);
    background-color: #fef2f2;
}

.form-error {
    display: none;
    color: var(--danger-color);
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

.form-error.active {
    display: block;
}

.form-help {
    font-size: 0.875rem;
    color: var(--text-light);
    margin-top: 0.25rem;
}

/* Динамические поля */
.dynamic-fields {
    margin-bottom: 1.5rem;
}

.field-item {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
    align-items: flex-start;
}

.field-item .form-group {
    flex: 1;
    margin-bottom: 0;
}

.btn-remove {
    background: linear-gradient(135deg, var(--danger-color), #ff5c7a);
    color: white;
    border: 1px solid var(--danger-color);
    border-radius: var(--radius);
    padding: 0.5rem 1rem;
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 600;
    min-height: 44px;
    transition: var(--transition);
    box-shadow: 0 4px 12px rgba(255, 92, 122, 0.2);
}

.btn-remove:hover {
    background: linear-gradient(135deg, #ff5c7a, var(--danger-color));
    box-shadow: 0 6px 20px rgba(255, 92, 122, 0.35);
    transform: translateY(-2px) scale(1.03);
}

.btn-add {
    background: linear-gradient(135deg, var(--secondary-color), var(--accent-green));
    color: white;
    border: 1px solid var(--secondary-color);
    border-radius: var(--radius);
    padding: 0.75rem 1.5rem;
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 600;
    min-height: 44px;
    transition: var(--transition);
    margin-bottom: 1.5rem;
    box-shadow: 0 4px 12px rgba(82, 217, 130, 0.2);
    position: relative;
    overflow: hidden;
}

.btn-add::before {
    content: '+';
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%) scale(0);
    font-size: 2rem;
    opacity: 0;
    transition: all 0.3s;
}

.btn-add:hover {
    background: linear-gradient(135deg, var(--secondary-hover), var(--secondary-color));
    box-shadow: 0 6px 20px rgba(82, 217, 130, 0.35), var(--glow-green);
    transform: translateY(-2px);
}

.btn-add:hover::before {
    transform: translate(-50%, -50%) scale(1);
    opacity: 0.3;
}

/* Результаты */
.calculator-results {
    background: linear-gradient(135deg, rgba(77, 166, 255, 0.08), rgba(82, 217, 130, 0.08));
    border: 1px solid var(--primary-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    margin-top: 2.5rem;
    box-shadow: var(--shadow), inset 0 0 30px rgba(77, 166, 255, 0.08);
    position: relative;
    overflow: hidden;
}

.calculator-results::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(77, 166, 255, 0.08) 0%, transparent 70%);
    animation: pulse 4s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.5; }
    50% { transform: scale(1.1); opacity: 0.8; }
}

.results-title {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
}

.result-item:last-child {
    border-bottom: none;
}

.result-label {
    font-weight: 500;
    color: var(--text-color);
}

.result-value {
    font-weight: 700;
    font-size: 1.125rem;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 0 15px rgba(77, 166, 255, 0.3);
}

.result-value.positive {
    background: linear-gradient(135deg, var(--secondary-color), var(--accent-green));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 0 15px rgba(82, 217, 130, 0.3);
}

.result-value.negative {
    color: var(--danger-color);
    text-shadow: 0 0 12px rgba(255, 92, 122, 0.3);
}

.result-copy {
    background: none;
    border: none;
    color: var(--primary-color);
    cursor: pointer;
    padding: 0.25rem 0.5rem;
    font-size: 0.875rem;
    margin-left: 0.5rem;
    transition: var(--transition);
}

.result-copy:hover {
    color: var(--primary-hover);
}

.result-copy.copied {
    color: var(--success-color);
}

/* Таблицы результатов (для системы) */
.results-table {
    margin-top: 1rem;
}

.results-table table {
    font-size: 0.875rem;
}

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

/* Сообщения */
.message {
    padding: 1rem;
    border-radius: var(--radius);
    margin-bottom: 1rem;
}

.message-info {
    background: rgba(77, 166, 255, 0.12);
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
    box-shadow: 0 0 15px rgba(77, 166, 255, 0.2);
}

.message-warning {
    background: rgba(255, 184, 77, 0.12);
    color: var(--warning-color);
    border: 1px solid var(--warning-color);
    box-shadow: 0 0 15px rgba(255, 184, 77, 0.2);
}

.message-error {
    background: rgba(255, 92, 122, 0.12);
    color: var(--danger-color);
    border: 1px solid var(--danger-color);
    box-shadow: 0 0 15px rgba(255, 92, 122, 0.2);
}

/* FAQ секция */
.section.faq {
    margin-top: 3rem;
}

.faq-item {
    margin-bottom: 1.5rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    overflow: hidden;
}

.faq-question {
    padding: 1.25rem;
    background: rgba(36, 52, 71, 0.5);
    border: 1px solid var(--border-color);
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
}

.faq-question:hover {
    background: rgba(77, 166, 255, 0.08);
    border-color: var(--primary-color);
    box-shadow: 0 0 12px rgba(77, 166, 255, 0.2);
}

.faq-question::after {
    content: '+';
    font-size: 1.5rem;
    color: var(--primary-color);
    transition: var(--transition);
}

.faq-item.active .faq-question::after {
    content: '−';
}

/* Стили для h3 в FAQ (новая структура) */
.faq-item h3 {
    padding: 1.25rem;
    background: rgba(36, 52, 71, 0.5);
    border: 1px solid var(--border-color);
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
    margin: 0;
}

.faq-item h3:hover {
    background: rgba(77, 166, 255, 0.08);
    border-color: var(--primary-color);
    box-shadow: 0 0 12px rgba(77, 166, 255, 0.2);
}

.faq-item h3::after {
    content: '+';
    font-size: 1.5rem;
    color: var(--primary-color);
    transition: var(--transition);
}

.faq-item.active h3::after {
    content: '−';
}

.faq-item > p {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    padding: 0 1.25rem;
    margin: 0;
}

.faq-item.active > p {
    max-height: 1000px;
    padding: 1.25rem;
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height 0.3s ease, padding 0.3s ease, opacity 0.3s ease;
    padding: 0;
}

.faq-item.active .faq-answer {
    max-height: 1000px;
    opacity: 1;
    padding: 1.25rem;
}

.faq-answer-content {
    padding: 0;
}

/* Адаптивность */
@media (min-width: 768px) {
    .calculator {
        padding: 2rem;
    }

    .field-item {
        align-items: center;
    }

    .result-item {
        padding: 1rem 0;
    }
}

.formula-box{
  background: var(--bg-secondary);
  padding: 1rem;
  border-radius: var(--radius);
  font-family: monospace;
}

.hero-lead{ margin-bottom: 1.25rem; }
.hero-cta{ display:inline-block; margin-bottom: 1.5rem; }