/* styles.css — Стили для продающего лендинга «Обмен электронными документами» DOC-V */

:root {
    /* Технологичная премиальная палитра: глубокий индиго, королевский синий и неоновый бирюзовый */
    --primary: #0284c7; /* Сочный небесно-синий */
    --primary-light: #e0f2fe; /* Светло-голубой */
    --primary-dark: #0369a1; /* Глубокий синий */
    --primary-glow: rgba(2, 132, 199, 0.12); /* Мягкое синее свечение */
    
    --success: #0d9488;
    --primary-dark-glow: rgba(3, 105, 161, 0.4);

    --background: #f8fafc; /* Мягкий светлый slate фон */
    --foreground: #0f172a; /* Глубокий темно-серый */
    --accents-1: #f1f5f9;  /* Фон карточек */
    --accents-2: #e2e8f0;  /* Нежные границы */
    --accents-3: #cbd5e1;  
    --accents-4: #94a3b8;  
    --accents-5: #0f766e;  /* Текст бирюзового акцента */
    --accents-6: #1e293b;  
    --accents-7: #0f172a;  
    --accents-8: #020617;  

    --nav-bg: rgba(241, 245, 249, 0.85); /* Матовый фон шапки */
    --nav-hover-bg: rgba(241, 245, 249, 0.95);
    --card-bg: rgba(255, 255, 255, 0.75); 
    
    --card-title-gradient: linear-gradient(135deg, #1e1b4b 0%, #0369a1 100%);
    --hero-gradient: linear-gradient(135deg, #1e1b4b 20%, #0f172a 100%);
    
    --card-border: 1px solid var(--accents-2);
    --btn-secondary-hover-bg: rgba(2, 132, 199, 0.06);
    --btn-secondary-border: 1px solid var(--accents-2);
    
    /* Уникальные цвета для опроса */
    --risk-low: #10b981;
    --risk-medium: #f59e0b;
    --risk-high: #ef4444;
}

body.dark-theme {
    --background: #020617; /* Глубокий индиго-черный фон */
    --foreground: #f8fafc;
    --accents-1: #0b0f19;  /* Темный фон карточек */
    --accents-2: #1e293b;  /* Темно-серые границы */
    --accents-3: #334155;  
    --accents-4: #475569;  
    --accents-5: #38bdf8;  /* Светло-голубой для темной темы */
    --accents-6: #7dd3fc;  
    --accents-7: #f1f5f9;  
    --accents-8: #f8fafc;  

    --primary: #06b6d4; /* Яркий неоновый бирюзовый */
    --primary-light: #ecfeff;
    --primary-dark: #0891b2;
    --primary-glow: rgba(6, 182, 212, 0.2);
    
    --nav-bg: rgba(2, 6, 23, 0.7);
    --nav-hover-bg: rgba(2, 6, 23, 0.9);
    --card-bg: rgba(11, 15, 25, 0.5);
    
    --card-title-gradient: linear-gradient(90deg, #ffffff, #06b6d4);
    --hero-gradient: linear-gradient(135deg, #03000a 20%, #0b1528 100%);
    
    --card-border: 1px solid rgba(6, 182, 212, 0.15);
    --btn-secondary-hover-bg: rgba(255, 255, 255, 0.05);
}

.slide-section {
    padding: 6rem 0;
    border-bottom: 1px solid var(--accents-2);
    position: relative;
}

.slide-section:nth-child(even) {
    background: var(--accents-1);
}

.slide-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 4rem;
    align-items: center;
}

.slide-section:nth-child(even) .slide-grid {
    grid-template-columns: 1.2fr 1fr;
}

.slide-section:nth-child(even) .slide-text-col {
    order: 2;
}

.slide-section:nth-child(even) .slide-img-col {
    order: 1;
}

/* Столбец текста */
.slide-text-col {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.slide-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 1rem;
    background: var(--primary-glow);
    border: 1px solid var(--primary);
    border-radius: 30px;
    color: var(--primary-dark);
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    width: fit-content;
    margin-bottom: 1.5rem;
}

body.dark-theme .slide-badge {
    color: var(--primary);
}

.slide-text-col h3 {
    font-size: 2.2rem;
    margin-bottom: 1.5rem;
    background: var(--card-title-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1.2;
}

.slide-text-col p {
    font-size: 1.1rem;
    line-height: 1.7;
    color: var(--accents-5);
    margin-bottom: 2rem;
}

/* Чек-листы */
.proc-features {
    list-style: none;
    padding: 0;
    margin-bottom: 2rem;
}

.proc-features li {
    position: relative;
    padding-left: 2.2rem;
    margin-bottom: 1.2rem;
    font-size: 1.05rem;
    color: var(--foreground);
    font-weight: 500;
    line-height: 1.5;
}

.proc-features li::before {
    content: "✓";
    position: absolute;
    left: 0;
    top: 1px;
    width: 24px;
    height: 24px;
    background: var(--primary-glow);
    color: var(--primary-dark);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: 900;
    border: 1px solid var(--primary);
}

body.dark-theme .proc-features li::before {
    color: var(--primary);
}

/* Столбец изображения/схемы */
.slide-img-col {
    position: relative;
}

.screenshot-wrapper {
    background: var(--card-bg);
    border: var(--card-border);
    border-radius: 12px;
    padding: 0.5rem;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.08);
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    cursor: zoom-in;
    position: relative;
    overflow: hidden;
}

body.dark-theme .screenshot-wrapper {
    box-shadow: 0 10px 40px rgba(6, 182, 212, 0.05);
}

.screenshot-wrapper img {
    width: 100%;
    height: auto;
    border-radius: 8px;
    display: block;
    transition: transform 0.4s ease;
}

.screenshot-wrapper::after {
    content: "🔍 Нажмите для увеличения";
    position: absolute;
    bottom: 1rem;
    right: 1rem;
    background: rgba(0, 0, 0, 0.75);
    color: #fff;
    padding: 0.4rem 0.8rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    opacity: 0;
    transform: translateY(10px);
    transition: all 0.3s ease;
    backdrop-filter: blur(4px);
}

.screenshot-wrapper:hover {
    transform: translateY(-8px) scale(1.01);
    border-color: var(--primary);
    box-shadow: 0 20px 40px rgba(2, 132, 199, 0.15);
}

.screenshot-wrapper:hover::after {
    opacity: 1;
    transform: translateY(0);
}

.screenshot-wrapper:hover img {
    transform: scale(1.005);
}

/* Интерактивный Lightbox */
.lightbox {
    display: none;
    position: fixed;
    z-index: 9999;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.95);
    backdrop-filter: blur(10px);
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.lightbox.active {
    display: flex;
    opacity: 1;
}

.lightbox-content {
    max-width: 92%;
    max-height: 85%;
    border-radius: 8px;
    box-shadow: 0 0 50px rgba(2, 132, 199, 0.2);
    transform: scale(0.9);
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.lightbox.active .lightbox-content {
    transform: scale(1);
}

.lightbox-close {
    position: absolute;
    top: 2rem;
    right: 2rem;
    color: #fff;
    font-size: 3rem;
    cursor: pointer;
    user-select: none;
    transition: transform 0.2s, color 0.2s;
    line-height: 1;
}

.lightbox-close:hover {
    color: var(--primary);
    transform: scale(1.1);
}

.lightbox-caption {
    position: absolute;
    bottom: 2rem;
    color: #fff;
    font-size: 1.15rem;
    text-align: center;
    background: rgba(0, 0, 0, 0.7);
    padding: 0.6rem 2.2rem;
    border-radius: 30px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    max-width: 80%;
    line-height: 1.4;
}

/* Оформление хедера презентации */
.presentation-header {
    text-align: center;
    padding: 10rem 0 4rem 0;
    background: var(--hero-gradient);
    color: #fff;
    position: relative;
    overflow: hidden;
}

.presentation-header h1 {
    font-size: 3.4rem;
    margin-bottom: 1.5rem;
    color: #fff;
    line-height: 1.15;
    background: none;
    -webkit-text-fill-color: initial;
    text-shadow: 0 4px 20px rgba(0,0,0,0.35);
}

.presentation-header p {
    font-size: 1.25rem;
    color: var(--primary-light);
    max-width: 800px;
    margin: 0 auto 2.5rem auto;
    text-shadow: 0 2px 10px rgba(0,0,0,0.3);
    line-height: 1.6;
}

/* Интерактивный интерактивный опрос */
.interactive-quiz {
    background: var(--card-bg);
    border: var(--card-border);
    border-radius: 20px;
    padding: 3rem;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.08);
    max-width: 800px;
    margin: 0 auto 4rem auto;
    backdrop-filter: blur(10px);
}

body.dark-theme .interactive-quiz {
    box-shadow: 0 20px 50px rgba(6, 182, 212, 0.05);
}

.quiz-title {
    font-size: 1.8rem;
    font-weight: 800;
    margin-bottom: 1rem;
    text-align: center;
    color: var(--foreground);
}

.quiz-desc {
    text-align: center;
    color: var(--accents-5);
    margin-bottom: 2.5rem;
    font-size: 1.05rem;
}

.quiz-question {
    margin-bottom: 2.5rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--accents-2);
}

.quiz-question:last-of-type {
    border-bottom: none;
    margin-bottom: 1.5rem;
    padding-bottom: 0;
}

.question-text {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--foreground);
}

.question-sub {
    font-size: 0.95rem;
    color: var(--accents-5);
    margin-bottom: 1.25rem;
    line-height: 1.5;
}

.options-group {
    display: flex;
    gap: 1.5rem;
}

.option-btn {
    flex: 1;
    padding: 0.85rem 1.5rem;
    border: 2px solid var(--accents-2);
    background: transparent;
    color: var(--foreground);
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.25s ease;
}

.option-btn:hover {
    border-color: var(--primary);
    background: var(--primary-glow);
}

.option-btn.selected-yes {
    background: rgba(239, 68, 68, 0.1);
    border-color: var(--risk-high);
    color: var(--risk-high);
}

.option-btn.selected-no {
    background: rgba(16, 185, 129, 0.1);
    border-color: var(--risk-low);
    color: var(--risk-low);
}

/* Индикатор результатов теста */
.quiz-results {
    margin-top: 2rem;
    padding: 2rem;
    border-radius: 12px;
    background: var(--accents-1);
    border: 1px solid var(--accents-2);
    text-align: center;
    display: none;
    animation: fadeIn 0.4s ease forwards;
}

.risk-scale {
    height: 12px;
    background: var(--accents-2);
    border-radius: 6px;
    margin: 1.5rem 0;
    position: relative;
    overflow: hidden;
}

.risk-bar {
    height: 100%;
    width: 0%;
    border-radius: 6px;
    transition: width 0.6s cubic-bezier(0.16, 1, 0.3, 1), background-color 0.4s ease;
}

.risk-value-text {
    font-size: 1.3rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
}

.risk-desc-text {
    font-size: 1.05rem;
    line-height: 1.5;
    margin-bottom: 1.5rem;
}

/* Премиальная B2B карточка ROI и сравнения ДО и ПОСЛЕ */
.comparison-card {
    background: rgba(10, 15, 30, 0.45);
    border: 1px solid rgba(6, 182, 212, 0.15);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: 16px;
    padding: 2.2rem;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.comparison-header h4 {
    color: #fff !important;
    font-size: 1.3rem;
    font-weight: 700;
    margin: 0 0 0.4rem 0;
    background: none;
    -webkit-text-fill-color: initial;
}

.comparison-header p {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
    margin: 0;
}

.comparison-body {
    display: flex;
    flex-direction: column;
}

.comparison-row {
    display: grid;
    grid-template-columns: 1.2fr 1fr 1fr;
    gap: 1.5rem;
    align-items: center;
    padding: 1.1rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.comparison-row:last-child {
    border-bottom: none;
}

.comparison-row.table-header {
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: rgba(255, 255, 255, 0.45);
    padding-bottom: 0.6rem;
    padding-top: 0;
}

.comp-feature {
    color: #fff;
    font-size: 0.95rem;
    font-weight: 600;
}

.comp-old span {
    color: rgba(255, 255, 255, 0.7);
    font-weight: 500;
    font-size: 0.9rem;
}

.comp-old small {
    display: block;
    color: rgba(255, 255, 255, 0.4);
    font-size: 0.75rem;
    margin-top: 0.2rem;
}

.comp-new span {
    color: #06b6d4;
    font-weight: 700;
    font-size: 0.9rem;
    background: rgba(6, 182, 212, 0.15);
    padding: 0.2rem 0.6rem;
    border-radius: 6px;
    display: inline-block;
    border: 1px solid rgba(6, 182, 212, 0.2);
}

body.dark-theme .comp-new span {
    color: var(--primary);
    background: var(--primary-glow);
    border-color: rgba(6, 182, 212, 0.25);
}

.comp-new small {
    display: block;
    color: rgba(255, 255, 255, 0.65);
    font-size: 0.75rem;
    margin-top: 0.2rem;
}

.comparison-footer {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* Инфографическая схема суверенного контура */
.onpremise-visual {
    background: var(--card-bg);
    border: var(--card-border);
    border-radius: 16px;
    padding: 2.5rem;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.05);
    display: flex;
    flex-direction: column;
    gap: 2rem;
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
}

body.dark-theme .onpremise-visual {
    box-shadow: 0 20px 40px rgba(6, 182, 212, 0.03);
}

.visual-shield {
    text-align: center;
    border-bottom: 1px solid var(--accents-2);
    padding-bottom: 1.5rem;
}

.visual-shield .shield-icon {
    font-size: 3.5rem;
    display: block;
    margin-bottom: 1rem;
    filter: drop-shadow(0 4px 12px var(--primary-glow));
}

.visual-shield h4 {
    font-size: 1.3rem;
    font-weight: 800;
    color: var(--foreground);
    margin-bottom: 0.5rem;
}

.visual-shield p {
    font-size: 0.88rem;
    color: var(--accents-5);
    margin: 0;
}

.visual-nodes {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.visual-node {
    background: var(--accents-1);
    border: 1px solid var(--accents-2);
    border-radius: 8px;
    padding: 1rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--foreground);
    transition: all 0.3s ease;
}

.visual-node:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--primary-glow);
}

.visual-node .node-emoji {
    font-size: 1.3rem;
}

.visual-footer {
    text-align: center;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--primary-dark);
    background: var(--primary-glow);
    padding: 0.75rem;
    border-radius: 6px;
    border: 1px solid rgba(2, 132, 199, 0.15);
}

body.dark-theme .visual-footer {
    color: var(--primary);
    border-color: rgba(6, 182, 212, 0.2);
}

/* Callout для шифрования */
.crypto-callout {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    padding: 1.25rem;
    background: var(--primary-glow);
    border-left: 4px solid var(--primary);
    border-radius: 4px;
    margin-top: 1.5rem;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.02);
}

.crypto-callout .callout-icon {
    font-size: 1.8rem;
    line-height: 1;
}

.crypto-callout .callout-text {
    font-size: 0.95rem;
    font-weight: 600;
    line-height: 1.55;
    color: var(--foreground);
}

/* Анимация плавного появления */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(15px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Адаптивность */
@media (max-width: 992px) {
    .slide-grid, .slide-section:nth-child(even) .slide-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .slide-section:nth-child(even) .slide-text-col {
        order: 1;
    }
    
    .slide-section:nth-child(even) .slide-img-col {
        order: 2;
    }
    
    .presentation-header h1 {
        font-size: 2.5rem;
    }
    
    .slide-text-col h3 {
        font-size: 1.8rem;
    }
    
    .interactive-quiz {
        padding: 1.5rem;
    }
    
    .quiz-title {
        font-size: 1.5rem;
    }
}

@media (max-width: 576px) {
    .comparison-card {
        padding: 1.2rem;
    }
    .comparison-row {
        gap: 0.6rem;
        padding: 0.8rem 0;
    }
    .comp-feature {
        font-size: 0.8rem;
    }
    .comp-old span, .comp-new span {
        font-size: 0.75rem;
    }
    .comp-old small, .comp-new small {
        font-size: 0.65rem;
        line-height: 1.2;
    }
    .comparison-row.table-header {
        font-size: 0.65rem;
    }
    .comparison-footer {
        gap: 1rem;
    }
    .options-group {
        flex-direction: column;
        gap: 0.75rem;
    }
    .option-btn {
        width: 100%;
    }
}

header[id], section[id] {
    scroll-margin-top: 70px;
}