/* style.css — НефтеХим | v2.4.0 | PHP 7.2+ | Modern Browsers */

:root {
    --brand-dark: #0c1929;
    --brand-blue: #1a3a5c;
    --brand-accent: #0d6efd;
    --brand-accent-hover: #0a58ca;
    --text-light: rgba(255, 255, 255, 0.85);
    --text-muted: rgba(255, 255, 255, 0.75);
    --hero-gradient: linear-gradient(193deg, #b32b08, #061e40, #c3c3bb, #061e40, #b32b08);
    --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 12px 24px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 12px 30px rgba(13, 110, 253, 0.15);
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.6s ease;
}

@keyframes breathe {
    0%, 100% { transform: scale(1); filter: drop-shadow(0 0 5px rgba(255,255,255,0.3)); }
    50% { transform: scale(1.12); filter: drop-shadow(0 0 15px rgba(255,255,255,0.7)); }
}
@keyframes pageEnter { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
@keyframes gradientFlow { 0%, 100% { background-position: 0% 50%; } 50% { background-position: 100% 50%; } }
@keyframes modalFadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes modalZoomIn { from { opacity: 0; transform: scale(0.9) translateY(20px); } to { opacity: 1; transform: scale(1) translateY(0); } }

html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
    display: flex; flex-direction: column; min-height: 100vh; padding-top: 76px;
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    background: #f8f9fa; color: #212529; line-height: 1.6;
    animation: pageEnter var(--transition-slow);
}
main { flex: 1 0 auto; }
a { transition: color var(--transition-fast); text-decoration: none; }
a.text-primary:hover { color: var(--brand-accent-hover); }
a.text-white-50:hover { color: #fff; }

#hero, .page-hero {
    background: var(--hero-gradient); color: #fff; padding: 120px 0 80px;
    position: relative; overflow: hidden;
}
#hero::before, .page-hero::before {
    content: ""; position: absolute; inset: 0;
    background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100' preserveAspectRatio='none'%3E%3Cpath d='M0,0 L100,0 L100,100 Z' fill='rgba(255,255,255,0.05)'/%3E%3C/svg%3E");
    background-size: cover; pointer-events: none;
}

#mainNav {
    background-image: linear-gradient(270deg, #b32b08, #061e40, #e6e7e4, #061e40, #b32b08);
    background-size: 400% 400%; background-position: 0% 50%;
    animation: gradientFlow 15s ease infinite;
    transition: box-shadow 0.3s ease, backdrop-filter 0.3s ease;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.15); will-change: background-position;
}
#mainNav.scrolled {
    background-image: linear-gradient(270deg, #b32b08, #061e40, #e6e7e4, #061e40, #b32b08) !important;
    animation: gradientFlow 12s ease infinite !important;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.25) !important; backdrop-filter: blur(10px);
}
#mainNav .nav-link {
    position: relative; color: var(--text-light); transition: color var(--transition-normal);
    padding: 0.5rem 1rem;
}
#mainNav .nav-link:hover, #mainNav .nav-link.active { color: #fff; }
#mainNav .nav-link::after {
    content: ''; position: absolute; bottom: 0; left: 50%; width: 0; height: 2px;
    background: #fff; transition: all var(--transition-normal);
    transform: translateX(-50%); opacity: 0;
}
#mainNav .nav-link:hover::after, #mainNav .nav-link.active::after { width: 70%; opacity: 1; }

.navbar-logo {
    max-height: 45px; width: auto; object-fit: contain; transform-origin: center;
    cursor: pointer; transition: opacity var(--transition-normal);
    filter: drop-shadow(0 0 5px rgba(255,255,255,0.3));
}
.navbar-logo:hover { filter: drop-shadow(0 0 12px rgba(255,255,255,0.8)); }
@media (hover: hover) and (pointer: fine) {
    a.navbar-brand:hover .navbar-logo { animation: breathe 1.5s ease-in-out; }
}
.navbar-logo.breathe-once { animation: breathe 1.5s ease-in-out forwards; }
.navbar-logo.breathe-continuous,
img[src*="bar.webp"].breathe-continuous {
    animation: breathe 4s cubic-bezier(0.4, 0, 0.2, 1) infinite;
    will-change: transform, filter;
}

#mainNav .dropdown-menu {
    min-width: 220px; margin-top: 0.5rem; background: #fff; border: none;
    border-radius: 0.5rem; box-shadow: var(--shadow-md); padding: 0.5rem 0;
}
#mainNav .dropdown-item {
    padding: 0.6rem 1.25rem; font-size: 0.95rem; color: #212529;
    transition: background var(--transition-fast), color var(--transition-fast);
}
#mainNav .dropdown-item:hover, #mainNav .dropdown-item:focus {
    background: #f8f9fa; color: var(--brand-accent);
}
#mainNav .dropdown-item.active { color: #fff; background-color: var(--brand-accent); }

.card, .feature-card, .product-card, .fuel-card {
    height: 100%; border: none; border-radius: 12px; box-shadow: var(--shadow-sm);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
    background: #fff; margin-bottom: 1.5rem;
}
.card:hover, .feature-card:hover, .product-card:hover,
.card-hover:hover, .fuel-card:hover {
    transform: translateY(-6px); box-shadow: var(--shadow-lg);
}
.feature-icon, .icon-box {
    width: 64px; height: 64px; display: flex; align-items: center; justify-content: center;
    background: rgba(13, 110, 253, 0.1); border-radius: 12px;
    color: var(--brand-accent); margin: 0 auto 1rem;
}
.icon-box { width: 80px; height: 80px; border-radius: 50%; }
.icon-92 { background: rgba(40, 167, 69, 0.15); color: #28a745; }
.icon-95 { background: rgba(13, 110, 253, 0.15); color: #0d6efd; }
.icon-dt { background: rgba(33, 37, 41, 0.15); color: #212529; }
.card-hover svg { transition: transform var(--transition-normal); }
.card-hover:hover svg { transform: scale(1.1); }

.cta-section {
    background: var(--hero-gradient); color: #fff; border-radius: 16px;
    padding: 2.5rem; margin-top: 3rem;
}
.cta-section h3, .cta-section p,
.cta-section .btn-outline-light, .phone-btn {
    color: #fff; border-color: #fff; background: transparent;
    transition: all var(--transition-fast);
}
.cta-section .btn-outline-light:hover,
.cta-section .btn-outline-light:focus,
.phone-btn:hover, .phone-btn:focus, .phone-btn:active {
    color: var(--brand-dark); background: #fff; border-color: #fff;
    box-shadow: var(--shadow-sm);
}
.phone-btn:focus-visible { outline: 2px solid #86b7fe; outline-offset: 2px; }

#formMessage { min-height: 1.5em; transition: opacity var(--transition-normal); }
.hero-text-block { max-width: 800px; margin: 0 auto; padding: 0 1rem; }
.filter-btn {
    border: 1px solid rgba(255, 255, 255, 0.3); color: #fff; background: transparent;
    padding: 8px 20px; border-radius: 30px; margin: 5px; cursor: pointer;
    transition: all var(--transition-fast);
}
.filter-btn:hover, .filter-btn.active {
    background: #fff; color: var(--brand-dark); border-color: #fff; font-weight: 600;
}
.filter-btn.active { box-shadow: 0 4px 12px rgba(13, 110, 253, 0.4); }
.product-item { transition: opacity var(--transition-normal), transform var(--transition-normal); }
.product-item.hidden { display: none; }
.animate-on-scroll {
    opacity: 0; transform: translateY(20px);
    transition: opacity var(--transition-slow), transform var(--transition-slow);
}
.animate-on-scroll.visible { opacity: 1; transform: translateY(0); }

footer {
    position: relative; z-index: 10; background: var(--brand-dark); color: #fff;
    padding: 2rem 0; margin-top: 2rem; clear: both; flex-shrink: 0;
}
footer.fixed-bottom { position: fixed; bottom: 0; left: 0; right: 0; z-index: 1030; }
body:has(footer.fixed-bottom) { padding-bottom: 100px; }
.card:has(form.needs-validation) { padding: 1rem 1rem 0.5rem !important; margin-bottom: 1rem !important; }
.card:has(form.needs-validation) .row > .col-12:last-child { margin-bottom: -0.5rem !important; padding-bottom: 0 !important; }
.card:has(form.needs-validation) .btn-primary { margin-bottom: 0 !important; }

.spec-badge {
    display: inline-block; font-size: 0.75rem; padding: 0.25rem 0.5rem;
    margin: 0.125rem; background: #e9ecef; border-radius: 4px; color: #495057;
}
.passport-wrapper {
    background: #fff; border-radius: 12px; padding: 1.5rem;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}
.passport-img, .passport-thumb {
    cursor: pointer; transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.passport-img:hover { transform: scale(1.01); }
.passport-thumb:hover { transform: scale(1.02); box-shadow: 0 8px 25px rgba(0,0,0,0.15); }

.passport-modal {
    display: none; position: fixed; z-index: 9999; left: 0; top: 0;
    width: 100%; height: 100%; background: rgba(12, 25, 41, 0.9);
    backdrop-filter: blur(5px); animation: modalFadeIn 0.3s ease;
}
.passport-modal.active {
    display: flex; align-items: center; justify-content: center; padding: 1rem;
}
.passport-modal-content {
    position: relative; max-width: 90vw; max-height: 90vh;
    animation: modalZoomIn 0.4s ease;
}
.passport-modal-img {
    width: auto; height: auto; max-width: 100%; max-height: 85vh;
    border-radius: 8px; box-shadow: 0 20px 60px rgba(0,0,0,0.4); cursor: zoom-out;
}
.passport-modal-close {
    position: absolute; top: -40px; right: 0; background: none; border: none;
    color: #fff; font-size: 2.5rem; line-height: 1; cursor: pointer;
    opacity: 0.8; transition: opacity 0.2s ease;
}
.passport-modal-close:hover { opacity: 1; }
.passport-modal-caption {
    text-align: center; color: #fff; margin-top: 0.75rem; font-size: 0.95rem;
}

img[src*="bar.webp"], img[src*="bar1.webp"] {
    transition: filter 0.3s ease;
    filter: drop-shadow(0 0 8px rgba(255, 255, 255, 0.4));
}
img[src*="bar.webp"]:hover, img[src*="bar1.webp"]:hover {
    filter: drop-shadow(0 0 15px rgba(255, 255, 255, 0.7));
}

@media (min-width: 768px) { .hero-text-block { padding: 0 2rem; } }
@media (max-width: 991px) {
    .navbar-logo { max-height: 36px; }
    .navbar .container { display: flex; align-items: center; justify-content: space-between; width: 100%; margin: 0; }
    .navbar-brand { display: flex; align-items: center; gap: 0.5rem; z-index: 1031; margin: 0; }
    .navbar-toggler { position: relative; z-index: 1031; border: 1px solid rgba(255, 255, 255, 0.5); margin: 0; padding: 0.5rem 0.75rem; }
    #mainNav .dropdown-menu {
        position: static; width: 100%; margin-top: 0; border: none; box-shadow: none;
        background: rgba(255, 255, 255, 0.08); border-radius: 0;
    }
    #mainNav .dropdown-item { color: #fff; padding: 0.75rem 1rem; text-align: center; }
    #mainNav .dropdown-item:hover, #mainNav .dropdown-item:focus { background: rgba(255, 255, 255, 0.15); color: #fff; }
    #mainNav .navbar-collapse {
        position: absolute; top: 100%; left: 0; right: 0;
        background: rgba(6, 30, 64, 0.98); padding: 1rem;
        border-top: 1px solid rgba(255, 255, 255, 0.1); z-index: 1030;
    }
    #mainNav .navbar-nav { text-align: center; width: 100%; }
    .hero-text-block, .page-hero { padding: 100px 0 60px; text-align: center; }
    .cta-section { padding: 2rem 1.5rem; }
    .card:has(form.needs-validation) { padding: 0.75rem 0.75rem 0.25rem !important; }
}
@media (max-width: 767px) {
    .passport-modal-close { top: -35px; font-size: 2rem; }
    .passport-modal-caption { font-size: 0.9rem; }
}

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    #mainNav { animation: none; background: var(--hero-gradient); }
    .card, .feature-card, .product-card, .filter-btn, .phone-btn, .navbar-logo {
        transition: none !important; animation: none !important;
    }
    .animate-on-scroll { opacity: 1 !important; transform: none !important; }
    a.navbar-brand:hover .navbar-logo, a.navbar-brand:active .navbar-logo {
        transform: scale(1.1) !important; filter: none !important;
    }
}

#mainNav::before, #mainNav::after, .navbar::before, .navbar::after { display: none !important; }
#contact { padding-bottom: 0.5rem !important; margin-bottom: 2rem !important; }
.ground-hero {
    background: linear-gradient(135deg, var(--brand-dark) 0%, var(--brand-blue) 100%);
    color: #fff; padding: 100px 0 60px; text-align: center;
}
.product-card-wrapper .btn-group .btn { flex: 1; min-width: 90px; }

body { user-select: text; }
button, .btn, [role="button"], input, textarea, select { user-select: none; }

/* Фикс stretched-link: текст выделяется, кнопки кликаются */
.product-card, .product-card-wrapper { position: relative !important; }
.product-card h3, .product-card h4, .product-card h5, .product-card p,
.product-card .spec-list, .product-card .spec-badge, .product-card .fw-bold,
.product-card .text-muted, .product-card .icon-wrap, .product-card img.product-card-img,
.product-card-wrapper h4, .product-card-wrapper h5, .product-card-wrapper p,
.product-card-wrapper .fw-bold, .product-card-wrapper .text-muted,
.fuel-card h5, .fuel-card p, .fuel-card .spec-list,
.category-card h5, .category-card p, .category-card .spec-list,
.item-box h5, .item-box p, .item-box .spec-list {
    position: relative !important; z-index: 2 !important;
    user-select: text !important; cursor: text !important; pointer-events: auto !important;
}
.product-card .btn, .product-card-wrapper .btn {
    position: relative !important; z-index: 3 !important;
    user-select: none !important; cursor: pointer !important; pointer-events: auto !important;
}
.product-card .stretched-link::after, .product-card-wrapper .stretched-link::after { z-index: 1 !important; }

/* Единый отступ между заголовком и списком в карточках */
.product-card h3 + ul,
.product-card h3 + .list-unstyled {
    margin-top: 1rem !important; /* или 1.25rem для mt-4 */
}

/* Строка с продуктами в hero */
.hero-products {
    font-size: 1.35rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    white-space: nowrap;
}

/* Адаптив для мобильных */
@media (max-width: 767px) {
    .hero-products {
        font-size: 0.95rem !important;
        letter-spacing: 0.2px !important;
    }
    .hero-products .mx-2 {
        margin-left: 0.3rem !important;
        margin-right: 0.3rem !important;
    }
}

@media (max-width: 480px) {
    .hero-products {
        font-size: 0.85rem !important;
    }
    .hero-products .mx-2 {
        margin-left: 0.2rem !important;
        margin-right: 0.2rem !important;
    }
}

@media (max-width: 360px) {
    .hero-products {
        font-size: 0.75rem !important;
    }
}

/* =================================================================
   ОПТИМИЗАЦИЯ КОНТРАСТНОСТИ (для PageSpeed Insights / WCAG AA)
   Незначительное затемнение цветов для гарантированного прохождения 
   тестов, при этом визуальный дизайн остается практически неизменным.
   ================================================================= */

/* 1. Акцентный текст внутри карточек (был на грани фола) */
.card .text-primary, 
.fw-semibold.text-primary {
    color: #084298 !important; /* Контраст 7.1:1 вместо 4.5:1 */
}

/* 2. Второстепенный текст в карточках (text-muted) */
.card .text-muted,
.product-card-wrapper .text-muted {
    color: #495057 !important; /* Контраст 7.5:1 вместо 4.6:1 */
}

/* 3. Контурные кнопки (Primary) */
.btn-outline-primary {
    color: #084298 !important;
    border-color: #084298 !important;
}
.btn-outline-primary:hover, .btn-outline-primary:focus {
    color: #fff !important;
    background-color: #0a58ca !important;
    border-color: #0a58ca !important;
}

/* 4. Контурные кнопки (Success) */
.btn-outline-success {
    color: #0f5132 !important; /* Контраст 7.5:1 */
    border-color: #0f5132 !important;
}
.btn-outline-success:hover, .btn-outline-success:focus {
    color: #fff !important;
    background-color: #146c43 !important;
    border-color: #146c43 !important;
}

/* 5. Основная кнопка действия (белый текст на синем фоне) */
.btn-primary {
    background-color: #0b5ed7 !important; /* Контраст с белым текстом 5.1:1 вместо 4.5:1 */
    border-color: #0b5ed7 !important;
}
.btn-primary:hover, .btn-primary:focus {
    background-color: #0a58ca !important;
    border-color: #0a58ca !important;
}

/* 1. Изолируем карточки: изменения внутри них не вызывают reflow всей страницы */
.card, .product-card-wrapper, .feature-card, .fuel-card {
    contain: layout style paint;
}

/* 2. Форсируем создание отдельных GPU-слоев для тяжелых анимаций */
.orbit-ring, .particle, .hero-slide-img, .navbar-logo, #mainNav {
    transform: translateZ(0); 
    backface-visibility: hidden;
}

/* 3. Предупреждаем браузер о предстоящих анимациях (частицы и орбиты) */
.particle, .orbit-ring {
    will-change: transform;
}