/* --- Стили для Забора (Forest Theme) --- */
:root {
    --accent-forest: #15803D; /* Green 700 */
    --accent-forest-dark: #14532D;
    --gradient-forest-card: linear-gradient(135deg, #22C55E 0%, #15803D 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: 16px; }
.input-group { margin-bottom: 16px; }
.input-group label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 8px; color: var(--text-primary); }

/* FIX стрелок */
input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
input[type="number"] { -moz-appearance: textfield; }

.input-wrapper { position: relative; display: flex; align-items: center; }

.input-wrapper input {
    width: 100%; padding: 14px 16px; 
    font-size: 18px; font-weight: 500;
    border: 1px solid #E5E7EB; border-radius: 12px;
    outline: none; transition: border 0.2s;
    font-family: var(--font-main);
}
.input-wrapper input:focus { border-color: var(--accent-forest); box-shadow: 0 0 0 3px rgba(21, 128, 61, 0.15); }

.row-2-col { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

/* Selector Types */
.fence-selector { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 8px; }
.fence-option { cursor: pointer; }
.fence-option input { display: none; }
.fence-card {
    border: 1px solid #E5E7EB; border-radius: 10px; padding: 12px 4px;
    display: flex; flex-direction: column; align-items: center; text-align: center;
    transition: all 0.2s; background: #fff; height: 100%;
}
.f-icon { font-size: 20px; margin-bottom: 4px; display: block; }
.fence-card span { font-size: 11px; font-weight: 700; color: var(--text-secondary); }

.fence-option input:checked + .fence-card {
    border-color: var(--accent-forest); background: #DCFCE7; /* Green 100 */
    color: var(--accent-forest-dark); box-shadow: 0 2px 8px rgba(21, 128, 61, 0.1);
}
.fence-option input:checked + .fence-card span { color: var(--accent-forest-dark); }

/* Range Slider */
.range-wrapper { display: flex; align-items: center; gap: 12px; }
.range-slider {
    flex-grow: 1; -webkit-appearance: none; height: 6px;
    background: #E5E7EB; border-radius: 5px; outline: none; cursor: pointer;
}
.range-slider::-webkit-slider-thumb {
    -webkit-appearance: none; width: 20px; height: 20px; border-radius: 50%;
    background: var(--accent-forest); cursor: pointer; border: 2px solid #fff;
    box-shadow: 0 2px 6px rgba(0,0,0,0.2); transition: transform 0.1s;
}
.range-val-right { font-weight: 700; width: 50px; text-align: right; color: var(--accent-forest); }


/* Результаты (Forest Card) */
.card--forest { background: var(--gradient-forest-card); color: #fff; border: none; }
.card--forest h2 { color: rgba(255,255,255,0.95); margin-bottom: 20px; font-size: 18px; }
@media (min-width: 900px) { .sticky-card { position: sticky; top: 24px; } }

/* Визуализация (Живой забор) */
.fence-visual-box {
    height: 160px; background: #E0F2FE; /* Небо */
    border-radius: 16px; margin-bottom: 24px; 
    position: relative; overflow: hidden;
    border: 4px solid rgba(255,255,255,0.2);
}
.grass-bg {
    position: absolute; bottom: 0; left: 0; width: 100%; height: 30px;
    background: #4ADE80; /* Трава */
    z-index: 1;
}

.fence-draw {
    position: absolute; bottom: 20px; left: 0; width: 100%; height: 100px;
    z-index: 2;
}

/* Столбы */
.post {
    position: absolute; bottom: 0; width: 8px; height: 100%;
    background: #374151; /* Dark Gray */
    z-index: 1;
}

/* Лаги */
.lag {
    position: absolute; left: 0; width: 100%; height: 4px;
    background: #4B5563; /* Gray */
    z-index: 0;
}
.lag-top { top: 20px; }
.lag-bottom { bottom: 20px; }

/* Обшивка (Поверхность) */
.fence-surface {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    z-index: 2; 
    transition: all 0.3s;
}

/* Стилизация типов */
.type-sheet .fence-surface {
    background: repeating-linear-gradient(
        90deg,
        #991B1B, /* Red fence */
        #991B1B 20px,
        #7F1D1D 20px,
        #7F1D1D 22px
    );
    opacity: 1;
}

.type-picket .fence-surface {
    background: repeating-linear-gradient(
        90deg,
        #92400E, /* Wood color */
        #92400E var(--picket-w, 20px),
        transparent var(--picket-w, 20px),
        transparent var(--picket-gap, 30px)
    );
}

.type-net .fence-surface {
    background-image: linear-gradient(45deg, #6B7280 25%, transparent 25%), 
                      linear-gradient(-45deg, #6B7280 25%, transparent 25%), 
                      linear-gradient(45deg, transparent 75%, #6B7280 75%), 
                      linear-gradient(-45deg, transparent 75%, #6B7280 75%);
    background-size: 10px 10px;
    background-position: 0 0, 0 5px, 5px -5px, -5px 0px;
    opacity: 0.5; 
}


.summary-list { display: flex; flex-direction: column; gap: 12px; }
.summary-item {
    display: flex; justify-content: space-between; align-items: center;
    border-bottom: 1px solid rgba(255,255,255,0.2); 
    padding-bottom: 10px; font-size: 14px;
}
.summary-item:last-child { border-bottom: none; }
.text-right { text-align: right; line-height: 1.2; }
.summary-item strong { font-size: 18px; font-weight: 700; }

.summary-divider { height: 1px; background: rgba(255,255,255,0.2); margin: 12px 0; }

.tip-box {
    font-size: 13px; line-height: 1.5; color: #ffffff !important;
    background: rgba(0, 0, 0, 0.3) !important; padding: 16px; border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.15); margin-top: 24px;
}
.tip-box p { margin: 0; color: #ffffff !important; }


/* --- НОВЫЕ ИНФОРМАЦИОННЫЕ БЛОКИ --- */

.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 с иконками */
.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: 14px;
    background: #fff;
    box-shadow: 0 4px 12px rgba(0,0,0,0.04);
    flex-shrink: 0;
    margin-top: -4px;
}

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

/* Цвета иконок */
.blue-icon svg { color: #2563EB; }
.orange-icon svg { color: #F59E0B; }
.green-icon svg { color: var(--accent-forest); }
.red-icon svg { color: #EF4444; }

/* Маленькие подзаголовки */
.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: var(--shadow-soft);
    border-radius: var(--radius-lg); 
    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: var(--shadow-hover); }

/* Вертикальный хедер (бейдж сверху) */
.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: #2563EB; color: #fff;
    padding: 6px 12px; border-radius: 99px;
    font-size: 11px; font-weight: 700;
    text-transform: uppercase; letter-spacing: 0.05em;
    display: inline-block;
}
.badge-green {
    background: #10B981; color: #fff;
    padding: 6px 12px; border-radius: 99px;
    font-size: 11px; font-weight: 700;
    text-transform: uppercase; letter-spacing: 0.05em;
    display: inline-block;
}

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

.math-expression {
    background: #F9FAFB;
    border: 1px solid #E5E7EB;
    padding: 12px 16px;
    border-radius: 12px;
    font-weight: 700;
    color: var(--accent-forest); /* Зеленый акцент */
    text-align: center;
    margin-bottom: 16px;
    font-size: 15px;
}

/* 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 (Стиль Fence) */
.faq-fence-style .faq-item {
    background: #fff; border: 1px solid #E5E7EB;
    border-radius: 12px; margin-bottom: 12px;
    overflow: hidden; transition: all 0.2s ease;
}

.faq-fence-style .faq-item[open] {
    border-color: var(--accent-forest); 
    box-shadow: 0 4px 20px rgba(21, 128, 61, 0.1);
}

.faq-fence-style 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;
}

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

.faq-fence-style .faq-item[open] summary.faq-question {
    color: var(--accent-forest-dark);
    background: #DCFCE7; /* Light Green */
}

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

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

.faq-answer {
    padding: 20px; color: var(--text-secondary);
    line-height: 1.6; font-size: 15px;
}

/* --- МОБИЛЬНАЯ АДАПТАЦИЯ --- */
@media (max-width: 900px) {
    /* Сетка в 1 колонку */
    .formulas-grid { grid-template-columns: 1fr; gap: 16px; margin-bottom: 32px; }
    
    /* Уменьшаем шрифты */
    .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; }
    
    /* Центрирование контента карточки */
    .formula-card { 
        padding: 24px; 
        text-align: center; 
        align-items: center; 
    }

    .formula-header {
        align-items: center;
        width: 100%;
    }

    /* Блок с формулой по центру */
    .math-expression {
        width: 100%;
        max-width: 300px;
        margin-left: auto;
        margin-right: auto;
    }

    .info-wrapper { margin-top: 40px; padding-top: 40px; }
}