/* --- Специфичные стили для калькулятора дат --- */

/* Цветовая схема: Violet */
:root {
    --accent-violet: #7C3AED;
    --accent-violet-light: #DDD6FE;
    --gradient-violet: linear-gradient(135deg, #8B5CF6 0%, #6D28D9 100%);
}

.calc-header { margin-bottom: 32px; }
.subtitle { color: var(--text-secondary); margin-top: 8px; }

/* Сетка */
.calc-grid { display: grid; grid-template-columns: 1fr; gap: 24px; align-items: start; }
@media (min-width: 900px) { .calc-grid { grid-template-columns: 1.2fr 0.8fr; } }

/* Inputs */
.calc-inputs { gap: 24px; }
.input-group { margin-bottom: 24px; }
.label-row { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
.label-row label { font-size: 14px; font-weight: 600; color: var(--text-primary); }

.date-wrapper input {
    width: 100%; padding: 14px; border: 1px solid #E5E7EB; border-radius: 12px;
    font-family: var(--font-main); font-size: 16px; color: var(--text-primary);
    transition: border 0.2s;
}
.date-wrapper input:focus { border-color: var(--accent-violet); outline: none; }

/* Кнопки-пресеты */
.presets { display: flex; gap: 8px; }
.btn-xs {
    background: #F3F4F6; border: none; color: var(--accent-violet);
    font-size: 12px; padding: 4px 8px; border-radius: 6px; cursor: pointer; font-weight: 600;
}
.btn-text {
    background: none; border: none; color: var(--accent-violet);
    font-size: 12px; cursor: pointer; font-weight: 600; padding: 0;
}

/* Toggle Switch */
.options-group {
    display: flex; flex-direction: column; gap: 20px;
    margin-top: 32px; padding-top: 24px; border-top: 1px solid #E5E7EB;
}
.toggle-row { display: flex; justify-content: space-between; align-items: center; cursor: pointer; gap: 16px; }
.toggle-label { font-size: 14px; font-weight: 600; color: var(--text-primary); display: flex; flex-direction: column; }
.toggle-label small { font-weight: 400; color: var(--text-secondary); margin-top: 4px; }
.toggle-input { display: none; }
.toggle-slider {
    width: 44px; height: 24px; background-color: #E5E7EB; border-radius: 24px;
    position: relative; transition: 0.3s; flex-shrink: 0;
}
.toggle-slider::before {
    content: ''; position: absolute; width: 20px; height: 20px; left: 2px; bottom: 2px;
    background-color: white; border-radius: 50%; transition: 0.3s; box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
.toggle-input:checked + .toggle-slider { background-color: var(--accent-violet); }
.toggle-input:checked + .toggle-slider::before { transform: translateX(20px); }

/* --- Результаты (Violet Card) --- */
.card--violet {
    background: var(--gradient-violet); color: #fff; border: none;
    overflow: hidden; position: relative;
}
.card--violet h2 { color: rgba(255,255,255,0.9); font-size: 16px; margin-bottom: 10px; }

.big-result {
    font-size: 56px; font-weight: 800; line-height: 1; margin: 20px 0 30px 0;
    display: flex; align-items: baseline; gap: 12px;
}
.result-unit { font-size: 20px; font-weight: 500; opacity: 0.8; }

/* Детальная сетка */
.detail-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-bottom: 24px; transition: opacity 0.3s; }
.detail-item {
    background: rgba(255,255,255,0.15); border-radius: 12px; padding: 10px 4px;
    text-align: center; backdrop-filter: blur(4px);
}
.detail-val { display: block; font-size: 18px; font-weight: 700; }
.detail-label { display: block; font-size: 11px; opacity: 0.8; margin-top: 4px; }

/* Инфо блок */
.summary-divider { height: 1px; background: rgba(255,255,255,0.2); margin: 20px 0; }
.extra-info { font-size: 14px; opacity: 0.9; display: flex; flex-direction: column; gap: 8px; }
.info-row { display: flex; justify-content: space-between; border-bottom: 1px solid rgba(255,255,255,0.1); padding-bottom: 8px; }
.info-row strong { font-weight: 700; }

/* Декор */
.calendar-decoration {
    position: absolute; bottom: -20px; right: -20px; display: grid;
    grid-template-columns: repeat(3, 1fr); gap: 8px; opacity: 0.1; transform: rotate(-15deg);
}
.cal-dot { width: 12px; height: 12px; background: #fff; border-radius: 4px; }

/* --- НОВЫЕ ИНФОРМАЦИОННЫЕ БЛОКИ (Date/Violet Style) --- */

.info-wrapper {
    padding: 60px 0 60px 0;
    margin-top: 60px;
    border-top: 1px solid rgba(0,0,0,0.06);
    margin-bottom: 20px;
}

.info-wrapper .container {
    max-width: 800px;
    margin: 0 auto;
}

/* Заголовки */
.icon-heading {
    display: flex; align-items: flex-start; gap: 16px;
    margin-bottom: 24px; font-size: 24px; font-weight: 800;
    color: var(--text-primary); line-height: 1.3;
}

.header-icon {
    display: flex; align-items: center; justify-content: center;
    width: 48px; height: 48px; border-radius: 12px;
    background: #fff; box-shadow: 0 4px 12px rgba(0,0,0,0.04);
    flex-shrink: 0; margin-top: -4px;
    color: var(--accent-violet);
}

.header-icon svg { width: 24px; height: 24px; stroke-width: 2px; }

/* Цвета иконок */
.blue-icon svg { color: #3B82F6; }
.orange-icon svg { color: #F97316; }
.red-icon svg { color: #EF4444; }

.small-heading {
    margin-top: 40px; margin-bottom: 16px; font-size: 20px;
}
.small-heading .header-icon { width: 40px; height: 40px; }
.small-heading .header-icon svg { width: 20px; height: 20px; }

.intro-text {
    font-size: 16px; color: var(--text-secondary); margin-bottom: 32px; line-height: 1.6;
}

/* --- Секция Формул --- */
.formulas-grid {
    display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-bottom: 48px;
}

.formula-card {
    background: #fff;
    border: 1px solid rgba(0,0,0,0.04);
    box-shadow: 0 4px 20px rgba(0,0,0,0.03);
    border-radius: 16px; 
    padding: 24px;
    transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    display: flex; flex-direction: column;
}
.formula-card:hover { transform: translateY(-4px); box-shadow: 0 12px 32px rgba(124, 58, 237, 0.15); border-color: var(--accent-violet-light); }

.formula-header {
    display: flex; flex-direction: column; align-items: flex-start; gap: 12px; margin-bottom: 16px;
}

.formula-card h3 {
    margin: 0; font-size: 18px; font-weight: 700; color: var(--text-primary); line-height: 1.3;
}

/* Бейджи */
.badge-blue {
    background: #DBEAFE; color: #2563EB;
    padding: 6px 12px; border-radius: 99px;
    font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em;
}
.badge-green {
    background: #D1FAE5; color: #059669;
    padding: 6px 12px; border-radius: 99px;
    font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em;
}

.formula-card p {
    font-size: 14px; color: var(--text-secondary); margin: 0; line-height: 1.5; font-weight: 500;
}

.math-expression {
    background: #F5F3FF; /* Violet Lightest */
    border: 1px solid #DDD6FE;
    padding: 12px 16px;
    border-radius: 12px;
    font-weight: 700;
    color: var(--accent-violet);
    text-align: center;
    margin-bottom: 16px;
    font-size: 15px;
    font-family: monospace;
}

/* Разделитель */
.soft-divider {
    border: none; height: 1px;
    background: linear-gradient(90deg, transparent, #E5E7EB, transparent);
    margin: 48px 0;
}

/* Описание */
.calc-description p {
    font-size: 16px; line-height: 1.7; color: var(--text-secondary); margin-bottom: 24px;
}
.calc-description strong { color: var(--text-primary); }

/* --- FAQ Секция (Violet Style) --- */
.faq-section .faq-item {
    background: #fff; border: 1px solid #E5E7EB;
    border-radius: 12px; margin-bottom: 12px;
    overflow: hidden; transition: all 0.2s ease;
}

.faq-section .faq-item[open] {
    border-color: var(--accent-violet); 
    box-shadow: 0 4px 20px rgba(124, 58, 237, 0.15);
}

summary.faq-question {
    padding: 16px 20px; cursor: pointer;
    font-weight: 600; color: var(--text-primary);
    list-style: none; position: relative;
    display: flex; justify-content: space-between;
    align-items: center; transition: background 0.2s;
}

summary.faq-question:hover { background-color: #F9FAFB; }

.faq-section .faq-item[open] summary.faq-question {
    color: var(--accent-violet);
    background: #F5F3FF;
}

.faq-question::after {
    content: '+'; font-size: 20px;
    color: var(--text-secondary); font-weight: 400; line-height: 1;
}
.faq-question .icon-plus { display: none; }

.faq-section .faq-item[open] summary.faq-question::after {
    content: '−'; color: var(--accent-violet);
}

.faq-answer, .faq-item div[itemprop="text"] {
    padding: 20px; color: var(--text-secondary);
    line-height: 1.6; font-size: 15px;
}

/* --- МОБИЛЬНАЯ АДАПТАЦИЯ --- */
@media (max-width: 900px) {
    .formulas-grid { grid-template-columns: 1fr; gap: 16px; margin-bottom: 32px; }
    .icon-heading { font-size: 20px; gap: 12px; margin-bottom: 20px; }
    .header-icon { width: 40px; height: 40px; border-radius: 12px; }
    .header-icon svg { width: 20px; height: 20px; }
    
    .formula-card { padding: 24px; text-align: center; align-items: center; }
    .formula-header { align-items: center; width: 100%; }
    .math-expression { width: 100%; max-width: 300px; margin-left: auto; margin-right: auto; }
    
    .info-wrapper { margin-top: 40px; padding-top: 40px; }
}