/* calc/assets/css/calculators/calculus-solver.css */

:root {
    --calc-primary: #0F766E; /* Teal-700 */
    --calc-bg: #F4F4F5;      /* Zinc-100 */
    --calc-dark: #18181B;    /* Zinc-900 (Доска) */
    --calc-accent: #2DD4BF;  /* Teal-400 (Неон) */
    
    --neon-glow: 0 0 15px rgba(45, 212, 191, 0.5), 0 0 30px rgba(45, 212, 191, 0.3);
}

/* --- ВЕРХНЯЯ ЧАСТЬ --- */
.calc-header { margin-bottom: 40px; }
.subtitle { color: var(--text-secondary); margin-top: 12px; font-size: 16px; line-height: 1.5; }

.calc-grid { display: grid; grid-template-columns: 1fr; gap: 32px; align-items: start; }
@media (min-width: 992px) { .calc-grid { grid-template-columns: 1fr 1.1fr; gap: 48px; } }

/* Инпуты */
.group-title-small { font-size: 14px; font-weight: 700; color: var(--calc-primary); text-transform: uppercase; letter-spacing: 0.5px; margin: 0 0 16px 0; border-left: 3px solid var(--calc-primary); padding-left: 8px; }
.label-with-icon { display: flex; align-items: center; gap: 8px; color: var(--calc-primary) !important; font-size: 15px !important; font-weight: 700 !important; margin-bottom: 12px; }

/* Кастомный инпут для математики */
.math-input-wrap {
    display: flex; align-items: center; border: 2px solid #D1D5DB; border-radius: 12px;
    background: #fff; overflow: hidden; transition: all 0.2s;
}
.math-input-wrap:focus-within { border-color: var(--calc-primary); box-shadow: 0 0 0 4px rgba(15, 118, 110, 0.15); }
.math-prefix {
    background: #F3F4F6; padding: 16px 20px; font-weight: 800; color: var(--calc-primary);
    font-family: 'Courier New', Courier, monospace; border-right: 1px solid #D1D5DB;
    font-size: 18px; width: 80px; text-align: center; flex-shrink: 0;
}
.math-input-wrap input {
    flex-grow: 1; border: none; padding: 16px; font-size: 20px; font-weight: 700;
    font-family: 'Courier New', Courier, monospace; outline: none; color: #111827;
}

.highlight-group { background: #F0FDFA; padding: 24px; border-radius: 16px; border: 1px dashed var(--calc-primary); }
.helper-text { font-size: 13px; color: #6B7280; line-height: 1.4; margin-top: 12px; }
.mt-3 { margin-top: 16px; }

/* Сегмент контрол (Режим) */
.segment-control { display: flex; gap: 8px; background: #E4E4E7; padding: 6px; border-radius: 14px; margin-bottom: 24px;}
.segment-item { flex: 1; position: relative; }
.segment-item input { position: absolute; opacity: 0; cursor: pointer; height: 0; width: 0; }
.segment-box {
    display: flex; align-items: center; justify-content: center; gap: 6px;
    padding: 14px 8px; border-radius: 10px; font-size: 15px; font-weight: 700;
    color: #52525B; transition: all 0.2s; cursor: pointer; text-align: center; border: 1px solid transparent; user-select: none;
}
.segment-item input:checked + .segment-box { background: #fff; color: var(--calc-primary); border-color: #D1D5DB; box-shadow: 0 4px 10px rgba(0,0,0,0.05); }

/* Быстрые кнопки */
.quick-math-symbols { display: flex; gap: 8px; margin-top: 12px; flex-wrap: wrap; justify-content: center;}
.qm-btn {
    background: #fff; border: 1px solid #D1D5DB; color: #374151; font-weight: 700;
    font-family: 'Courier New', Courier, monospace; font-size: 15px; padding: 8px 16px;
    border-radius: 8px; cursor: pointer; transition: all 0.2s; box-shadow: 0 2px 4px rgba(0,0,0,0.02);
}
.qm-btn:hover { background: #F0FDFA; border-color: var(--calc-primary); color: var(--calc-primary); transform: translateY(-2px); }


/* --- ПРАВАЯ ЧАСТЬ: РЕЗУЛЬТАТ (KILLER FEATURE: Неоновая доска) --- */
@media (min-width: 992px) { .sticky-card { position: sticky; top: 24px; transition: top 0.3s; } }

.cyber-math-card {
    background: var(--calc-dark); /* Темная доска */
    border: 2px solid #27272A; padding: 40px 32px;
    border-radius: 20px; box-shadow: 0 20px 40px -10px rgba(0,0,0,0.8);
    position: relative; overflow: hidden;
}
/* Сетка на доске */
.cyber-math-card::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; bottom: 0;
    background-image: 
        linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
    background-size: 20px 20px; pointer-events: none; z-index: 1;
}

.result-header-neon { text-align: center; margin-bottom: 32px; position: relative; z-index: 2; }
.result-header-neon h2 { font-size: 13px; font-weight: 800; color: #71717A; margin: 0; text-transform: uppercase; letter-spacing: 2px; }

/* Математические дисплеи (ИСПРАВЛЕНЫ ЦВЕТА) */
.math-display {
    text-align: center; position: relative; z-index: 2;
    margin-bottom: 16px; word-wrap: break-word;
}
.source-func {
    background: rgba(255,255,255,0.05); padding: 16px; border-radius: 12px;
    border: 1px solid #3F3F46;
}

.m-oper { color: #5EEAD4; font-weight: 800; font-size: 20px; font-family: 'Courier New', Courier, monospace; } /* Светло-бирюзовый оператор */
.m-bracket { color: #71717A; font-weight: 800; font-size: 24px; font-family: 'Courier New', Courier, monospace; margin: 0 8px; } /* Серые скобки */
.math-text-source { color: #F4F4F5; font-size: 24px; font-weight: 600; font-family: 'Courier New', Courier, monospace; letter-spacing: 1px; } /* Светло-серый текст функции */

.math-equals { text-align: center; font-size: 32px; color: #52525B; margin: 24px 0; position: relative; z-index: 2; font-weight: 800; }

/* Результат (Светящийся) */
.result-func { font-size: 36px; font-weight: 800; margin-bottom: 40px; font-family: 'Courier New', Courier, monospace; }
.text-glow {
    color: #fff; /* Белый текст для максимального контраста */
    text-shadow: var(--neon-glow); /* Неоновое свечение вокруг текста */
    display: inline-block;
}
.text-danger-res { color: #FCA5A5; text-shadow: 0 0 15px rgba(239,68,68,0.5); }

/* Glassmorphism Правила */
.rules-applied-box {
    position: relative; z-index: 2;
    background: rgba(255, 255, 255, 0.05); border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
    padding: 24px; border-radius: 16px;
}
.rab-title { font-size: 14px; color: #F4F4F5; text-transform: uppercase; letter-spacing: 1px; margin: 0 0 16px 0; display: flex; align-items: center; gap: 8px; font-weight: 700;}
.rab-title i { color: var(--calc-accent); font-size: 18px; }

.rab-list { margin: 0; padding: 0; list-style: none; display: flex; flex-direction: column; gap: 12px; }
.rab-list li {
    font-size: 14px; color: #E4E4E7; line-height: 1.5;
    padding-left: 20px; position: relative;
}
.rab-list li::before {
    content: '→'; position: absolute; left: 0; top: 0; color: var(--calc-accent); font-weight: 800;
}
.rab-list code { background: rgba(0,0,0,0.3); padding: 2px 6px; border-radius: 4px; color: var(--calc-accent); font-family: 'Courier New', Courier, monospace; font-weight: 700; border: 1px solid rgba(45, 212, 191, 0.2);}


/* --- НИЖНЯЯ ЧАСТЬ (SEO, INFO) --- */
.info-wrapper { padding: 80px 0; margin-top: 60px; border-top: 1px solid #E5E7EB; }

.author-badge { display: flex; align-items: flex-start; gap: 16px; margin-bottom: 40px; padding: 20px; background: #F8FAFC; border-radius: 16px; border: 1px solid #E2E8F0; }
.author-avatar { width: 48px; height: 48px; background: var(--calc-primary); color: #fff; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 22px; flex-shrink: 0; }
.author-info { display: flex; flex-direction: column; min-width: 0; }
.author-name { font-size: 15px; font-weight: 700; color: #111827; line-height: 1.4; margin-bottom: 4px; }
.author-date { font-size: 13px; color: #6B7280; }

.icon-heading { display: flex; align-items: flex-start; gap: 16px; margin-bottom: 32px; font-size: 26px; font-weight: 800; color: #111827; line-height: 1.25; letter-spacing: -0.02em; }
.header-icon { display: flex; align-items: center; justify-content: center; width: 52px; height: 52px; border-radius: 14px; background: #fff; box-shadow: 0 4px 12px rgba(0,0,0,0.06); flex-shrink: 0; margin-top: -6px; font-size: 26px; }

.teal-icon { color: var(--calc-primary); }
.dark-icon { color: #111827; }
.text-teal { color: var(--calc-primary); font-weight: 700;}
.text-dark { color: #111827; font-weight: 700;}

.formulas-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; margin-bottom: 56px; }
.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: 24px; padding: 32px; transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1); display: flex; flex-direction: column; }
.formula-card:hover { transform: translateY(-6px); box-shadow: 0 12px 32px rgba(15, 118, 110, 0.1); border-color: rgba(15, 118, 110, 0.1); }
.formula-header { display: flex; flex-direction: column; align-items: flex-start; gap: 14px; margin-bottom: 20px; }
.formula-card h3 { margin: 0; font-size: 20px; font-weight: 700; color: var(--text-primary); line-height: 1.3; }

.badge-teal { background: var(--calc-primary); color: #fff; padding: 6px 12px; border-radius: 99px; font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.5px; display: inline-block; }
.badge-dark { background: #111827; color: #fff; padding: 6px 12px; border-radius: 99px; font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.5px; display: inline-block; }

.formula-card p { font-size: 15px; color: var(--text-secondary); margin: 0; line-height: 1.6; font-weight: 500; }
.math-expression { background: #F0FDFA; border: 1px dashed var(--calc-primary); padding: 18px; border-radius: 14px; font-weight: 700; color: var(--calc-primary); text-align: center; margin-bottom: 20px; font-size: 17px; font-family: 'Courier New', Courier, monospace; letter-spacing: 0.5px; }

.soft-divider { border: none; height: 1px; background: linear-gradient(90deg, transparent, #E5E7EB, transparent); margin: 56px 0; opacity: 0.7; }
.intro-text { font-size: 16px; color: var(--text-secondary); line-height: 1.6; margin-bottom: 40px; }
.calc-description p { font-size: 17px; line-height: 1.7; color: #4B5563; margin-bottom: 24px; }
.calc-description strong { color: #1F2937; font-weight: 700; }

/* Перелинковка */
.internal-links-box { margin-top: 32px; background: #F3F4F6; padding: 24px; border-radius: 16px; border-left: 4px solid var(--calc-primary); }
.internal-links-box h4 { margin: 0 0 12px 0; font-size: 17px; color: #111827; }
.internal-links-box ul { margin: 0; padding-left: 20px; color: #4B5563; }
.internal-links-box li { margin-bottom: 8px; font-size: 15px; }
.internal-links-box a { color: var(--calc-primary); text-decoration: underline; font-weight: 600; }

/* SEO Таблица */
.seo-table-wrapper { overflow-x: auto; margin-bottom: 48px; background: #fff; border-radius: 16px; border: 1px solid #E5E7EB; box-shadow: 0 4px 10px rgba(0,0,0,0.02); }
.seo-table-wrapper::-webkit-scrollbar { height: 6px; }
.seo-table-wrapper::-webkit-scrollbar-thumb { background: #D1D5DB; border-radius: 3px; }
.seo-table { width: 100%; border-collapse: collapse; min-width: 500px; text-align: left; }
.seo-table th { background: #F9FAFB; padding: 18px 24px; font-size: 13px; font-weight: 800; color: #6B7280; text-transform: uppercase; border-bottom: 1px solid #E5E7EB; letter-spacing: 0.5px; }
.seo-table td { padding: 18px 24px; font-size: 14px; border-bottom: 1px solid #F3F4F6; color: #374151; vertical-align: top; line-height: 1.5; }
.seo-table tr:last-child td { border-bottom: none; }

.faq-section .faq-item { background: #fff; border: 1px solid #E5E7EB; border-radius: 16px; margin-bottom: 16px; overflow: hidden; transition: all 0.2s ease; }
.faq-section .faq-item:hover { border-color: #D1D5DB; }
.faq-section .faq-item[open] { border-color: var(--calc-primary); box-shadow: 0 8px 20px rgba(15, 118, 110, 0.08); }
summary.faq-question { padding: 22px 28px; cursor: pointer; font-weight: 700; color: var(--text-primary); font-size: 17px; list-style: none; position: relative; display: flex; justify-content: space-between; align-items: center; transition: background 0.2s; }
.faq-section .faq-item[open] summary.faq-question { color: var(--calc-primary); background: #F0FDFA; border-bottom: 1px solid #CCFBF1; }
.faq-question::after { content: '+'; font-size: 26px; color: #9CA3AF; font-weight: 400; line-height: 1; transition: transform 0.3s; }
.faq-section .faq-item[open] summary.faq-question::after { content: '−'; color: var(--calc-primary); }
.faq-answer, .faq-item div[itemprop="text"] { padding: 28px; color: var(--text-secondary); line-height: 1.7; font-size: 16px; background: #fff; }
.faq-answer p { margin: 0; }

@media (max-width: 900px) {
    .calc-header { margin-bottom: 32px; }
    .formulas-grid { grid-template-columns: 1fr; gap: 20px; }
    .icon-heading { font-size: 22px; gap: 12px; }
    .header-icon { width: 44px; height: 44px; font-size: 22px; }
    .formula-card { padding: 24px; }
    summary.faq-question { padding: 18px 20px; font-size: 16px; }
    .faq-answer, .faq-item div[itemprop="text"] { padding: 20px; font-size: 15px; }
}

@media (max-width: 480px) {
    .author-badge { padding: 16px; gap: 12px; align-items: flex-start; flex-direction: row; }
    .author-avatar { width: 40px; height: 40px; font-size: 18px; }
    
    .math-input-wrap { flex-direction: column; align-items: stretch; border-radius: 12px; overflow: hidden;}
    .math-prefix { text-align: center; border-right: none; border-bottom: 1px solid #D1D5DB; padding: 12px; width: 100%;}
    .math-input-wrap input { text-align: center; font-size: 20px; padding: 16px; }
    
    .cyber-math-card { padding: 32px 20px; }
    .result-func { font-size: 28px; word-break: break-all; }
    .math-text-source { font-size: 20px; }
}