/* --- Стили для Пиломатериалов (Pine Theme) --- */
:root {
    --accent-pine: #166534; /* Green 800 */
    --accent-pine-light: #DCFCE7;
    --gradient-pine-card: linear-gradient(135deg, #15803D 0%, #14532D 100%);
    --wood-texture: #78350F;
}

.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); }

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

.input-wrapper input {
    width: 100%; padding: 14px 16px; padding-right: 40px;
    font-size: 18px; font-weight: 500;
    border: 1px solid #E5E7EB; border-radius: 12px;
    outline: none; transition: border 0.2s, box-shadow 0.2s;
    font-family: var(--font-main);
    /* На мобильных предотвращаем увеличение шрифта при зуме, но оставляем читаемым */
    min-width: 0; 
}
.input-wrapper input:focus { border-color: var(--accent-pine); box-shadow: 0 0 0 3px rgba(22, 101, 52, 0.15); }
.suffix { position: absolute; right: 16px; color: var(--text-secondary); pointer-events: none; }

/* --- ИСПРАВЛЕНИЕ СЕТКИ (Адаптивность) --- */
/* По умолчанию (мобильные) - 1 колонка */
.row-3-col { display: grid; grid-template-columns: 1fr; gap: 12px; }

/* На экранах шире 600px - 3 колонки */
@media (min-width: 600px) {
    .row-3-col { grid-template-columns: 1fr 1fr 1fr; }
}

/* Mode Switcher */
.mode-switcher {
    display: flex; background: #F3F4F6; padding: 4px;
    border-radius: 12px; margin-bottom: 24px; gap: 4px;
}
.mode-btn {
    flex: 1; padding: 10px 4px; border: none; background: transparent;
    color: var(--text-secondary); font-size: 13px; font-weight: 600;
    border-radius: 8px; cursor: pointer; transition: all 0.2s; text-align: center;
}
.mode-btn.active { background: #fff; color: var(--text-primary); box-shadow: 0 2px 8px rgba(0,0,0,0.05); }

/* --- ПРЕСЕТЫ (ВКЛАДКИ) --- */
.presets-container { margin-bottom: 24px; }
.preset-group-title { font-size: 12px; font-weight: 700; color: var(--text-secondary); text-transform: uppercase; margin-bottom: 8px; }

.presets-tabs { display: flex; gap: 8px; margin-bottom: 12px; overflow-x: auto; }
.tab-pill {
    padding: 6px 14px; border-radius: 20px; border: 1px solid #E5E7EB; background: #fff;
    font-size: 13px; font-weight: 600; color: var(--text-secondary); cursor: pointer; transition: all 0.2s;
    white-space: nowrap;
}
.tab-pill.active {
    background: var(--accent-pine); color: #fff; border-color: var(--accent-pine);
}
.tab-pill:hover:not(.active) { background: #F9FAFB; border-color: #D1D5DB; }

.presets-grid {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px;
    animation: fadeIn 0.3s ease;
}
@keyframes fadeIn { from { opacity: 0; transform: translateY(5px); } to { opacity: 1; transform: translateY(0); } }

.preset-btn {
    background: #F9FAFB; border: 1px solid #E5E7EB; border-radius: 8px;
    padding: 10px 4px; font-size: 13px; font-weight: 600; color: var(--text-primary);
    cursor: pointer; transition: all 0.2s;
    /* Чтобы текст не обрезался на совсем маленьких экранах */
    white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.preset-btn:hover { background: #fff; border-color: #D1D5DB; box-shadow: 0 2px 4px rgba(0,0,0,0.05); }

.preset-btn.active {
    border-color: var(--accent-pine); background: var(--accent-pine-light); color: var(--accent-pine);
    box-shadow: inset 0 0 0 1px var(--accent-pine);
}

.custom-inputs-label {
    font-size: 12px; color: var(--text-secondary); margin-bottom: 12px; 
    border-top: 1px dashed #E5E7EB; padding-top: 16px; margin-top: 16px;
    text-align: center;
}

/* Результаты (Pine Card) */
.card--pine { 
    background: var(--gradient-pine-card); 
    color: #fff; 
    border: none; 
}
.card--pine h2 { color: rgba(255,255,255,0.95); margin-bottom: 20px; font-size: 16px; }
@media (min-width: 900px) { .sticky-card { position: sticky; top: 24px; } }

.big-result {
    font-size: 56px; font-weight: 800; line-height: 1; margin-bottom: 24px;
    display: flex; align-items: baseline; gap: 12px; white-space: nowrap;
}
.big-result small { font-size: 24px; font-weight: 600; opacity: 0.8; }

/* --- 3D ВИЗУАЛИЗАЦИЯ (ФИНАЛЬНАЯ) --- */
.wood-visual {
    height: 240px;
    background: rgba(255,255,255,0.1); 
    border-radius: 16px; 
    margin-bottom: 24px; 
    display: flex; 
    align-items: center; 
    justify-content: center;
    perspective: 1000px;
    overflow: hidden;
}

.board-scene {
    position: relative;
    width: 0; height: 0;
    transform-style: preserve-3d;
    transform: rotateX(-20deg) rotateY(-35deg); 
    transition: transform 0.5s ease;
}

.board-shape {
    position: relative;
    transform-style: preserve-3d;
    width: 0; height: 0; 
}

.face {
    position: absolute;
    top: 0; left: 0;
    box-sizing: border-box;
    background-color: #D97706;
    background-image: repeating-linear-gradient(90deg, rgba(0,0,0,0) 0px, rgba(0,0,0,0) 2px, rgba(0,0,0,0.03) 2px, rgba(0,0,0,0.03) 4px);
    border: 1px solid rgba(120, 53, 15, 0.3);
    backface-visibility: hidden;
}

.front {
    width: var(--vis-l); height: var(--vis-h); background-color: #F59E0B;
    transform: translate(-50%, -50%) translateZ(calc(var(--vis-w) / 2));
}
.back {
    width: var(--vis-l); height: var(--vis-h); background-color: #D97706;
    transform: translate(-50%, -50%) rotateY(180deg) translateZ(calc(var(--vis-w) / 2));
}
.top {
    width: var(--vis-l); height: var(--vis-w); background-color: #FBBF24;
    transform: translate(-50%, -50%) rotateX(90deg) translateZ(calc(var(--vis-h) / 2));
}
.bottom {
    width: var(--vis-l); height: var(--vis-w); background-color: #B45309;
    box-shadow: 0 0 50px rgba(0,0,0,0.5);
    transform: translate(-50%, -50%) rotateX(-90deg) translateZ(calc(var(--vis-h) / 2));
}
.right {
    width: var(--vis-w); height: var(--vis-h); background-color: #92400E;
    background-image: radial-gradient(circle at 50% 50%, rgba(255,255,255,0.15), transparent 80%);
    transform: translate(-50%, -50%) rotateY(90deg) translateZ(calc(var(--vis-l) / 2));
}
.left {
    width: var(--vis-w); height: var(--vis-h); background-color: #92400E;
    background-image: radial-gradient(circle at 50% 50%, rgba(255,255,255,0.15), transparent 80%);
    transform: translate(-50%, -50%) rotateY(-90deg) translateZ(calc(var(--vis-l) / 2));
}

.details-list { display: flex; flex-direction: column; gap: 12px; }
.detail-row {
    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;
}
.detail-row:last-child { border-bottom: none; }
.detail-row strong { font-size: 16px; font-weight: 700; }

.summary-divider { height: 1px; background: rgba(255,255,255,0.2); margin: 24px 0; }

.info-box {
    font-size: 13px; background: rgba(255,255,255,0.15); padding: 12px; border-radius: 12px;
    margin-top: 16px; display: flex; justify-content: space-between; align-items: center;
}
.info-box span { opacity: 0.9; }
.info-box strong { font-size: 16px; }

/* SEO/Text */
.content-text ul { margin-bottom: 24px; padding-left: 24px; list-style-type: disc; }
.content-text li { margin-bottom: 8px; line-height: 1.6; color: var(--text-secondary); }
.content-text li strong { color: var(--text-primary); }

/* --- НОВЫЕ СТИЛИ ДЛЯ ИНФО-БЛОКОВ (АДАПТИРОВАННЫЕ) --- */

.info-section {
    padding: 40px 0;
    border-top: 1px solid #E5E7EB; /* Разделитель, как в дизайне */
    margin-top: 40px;
}

.info-block {
    margin-bottom: 50px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.info-block h2 {
    font-size: 1.5rem; /* Чуть меньше, под стиль заголовков */
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--text-primary);
    border-bottom: 2px solid #E5E7EB;
    padding-bottom: 12px;
}

/* Карточки формул */
.formula-card {
    background: #F9FAFB; /* Ваш стандартный фон для блоков */
    border: 1px solid #E5E7EB;
    border-radius: 16px; /* Как у основной карточки результата */
    padding: 24px;
    margin-bottom: 20px;
}

.formula-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-top: 0;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.math-expression {
    font-family: 'Courier New', Courier, monospace;
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--accent-pine); /* Используем зеленый акцент */
    background: #fff;
    padding: 16px;
    border-radius: 12px;
    text-align: center;
    border: 1px solid #E5E7EB;
    margin: 16px 0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.02);
}

.formula-legend {
    list-style: none;
    padding: 0;
    margin: 0;
    font-size: 14px;
    color: var(--text-secondary);
}

.formula-legend li {
    margin-bottom: 6px;
}
.formula-legend b {
    color: var(--text-primary);
}

/* Таблица плотности */
.table-responsive {
    overflow-x: auto;
    border: 1px solid #E5E7EB;
    border-radius: 12px;
}

.density-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
    background: #fff;
}

.density-table th, 
.density-table td {
    padding: 14px 20px;
    text-align: left;
    border-bottom: 1px solid #E5E7EB;
    color: var(--text-primary);
}

.density-table th {
    background-color: #F9FAFB;
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.density-table tr:last-child td {
    border-bottom: none;
}

.note {
    font-size: 13px;
    color: var(--text-secondary);
    margin-top: 12px;
}

/* FAQ (Аккордеон) в стиле Pine */
details.faq-item {
    background: #fff;
    border: 1px solid #E5E7EB;
    border-radius: 12px; /* Как инпуты */
    margin-bottom: 12px;
    overflow: hidden;
    transition: all 0.2s ease;
}

details.faq-item[open] {
    border-color: var(--accent-pine); /* Зеленая рамка при открытии */
    box-shadow: 0 4px 12px rgba(22, 101, 52, 0.08); /* Легкая зеленая тень */
}

summary {
    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:hover {
    background-color: #F9FAFB;
}

details[open] summary {
    background-color: var(--accent-pine-light); /* Светло-зеленый фон заголовка */
    color: var(--accent-pine);
    border-bottom: 1px solid rgba(22, 101, 52, 0.1);
}

/* Иконка плюса/минуса */
summary::after {
    content: '+';
    font-size: 20px;
    color: var(--text-secondary);
    font-weight: 400;
    line-height: 1;
}

details[open] summary::after {
    content: '−';
    color: var(--accent-pine);
}

summary::-webkit-details-marker {
    display: none;
}

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