/* =========================================
   1. ПЕРЕМЕННЫЕ И БАЗОВЫЕ НАСТРОЙКИ
   ========================================= */
:root {
    --bg-primary: #0a0a0a;
    --bg-secondary: #141414;
    --bg-tertiary: #1f1f1f;
    --text-primary: #ffffff;
    --text-secondary: #a8a8a8;
    --accent: #d4a574;
    --accent-hover: #c4956a;
    --border: rgba(212, 165, 116, 0.15);
    --border-radius: 6px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    height: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--text-primary);
    line-height: 1.6;
    background: var(--bg-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 1320px;
    margin: 0 auto;
    padding: 0 20px;
}

a {
    text-decoration: none;
    color: var(--accent);
    transition: color 0.2s ease;
}

a:hover {
    color: var(--accent-hover);
}

::selection {
    background: var(--accent);
    color: #000;
}

*:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* =========================================
   2. КНОПКИ
   ========================================= */
.btn {
    display: inline-block;
    background: var(--accent);
    color: #000;
    padding: 12px 24px;
    border: none;
    border-radius: var(--border-radius);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
    box-shadow: 0 4px 15px rgba(212, 165, 116, 0.18);
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.15), transparent);
    transition: left 0.5s;
    z-index: -1;
}

.btn:hover::before { left: 100%; }

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(212, 165, 116, 0.25);
    filter: brightness(1.1);
}

.btn:active { transform: translateY(0); }

.btn-outline {
    background-color: transparent;
    border: 1px solid var(--accent);
    color: var(--accent);
    box-shadow: none;
}

.btn-outline:hover {
    background-color: var(--accent);
    color: #000;
    box-shadow: 0 4px 15px rgba(212, 165, 116, 0.18);
}

/* =========================================
   3. ШАПКА
   ========================================= */
header {
    background-color: rgba(10, 10, 10, 0.92);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    flex-shrink: 0;
}

.header-main {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
    gap: 24px;
}

.logo {
    font-size: 2rem;
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -1px;
}

.logo span { color: var(--accent); }

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.8rem;
    cursor: pointer;
    color: var(--text-primary);
}

nav ul {
    display: flex;
    list-style: none;
    gap: 25px;
}

nav a {
    font-weight: 500;
    font-size: 1rem;
    color: var(--text-secondary);
}

nav a:hover, nav a.active { color: var(--accent); }

.header-contacts { text-align: right; }

.phone {
    display: block;
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* =========================================
   4. ГЛАВНЫЙ ЭКРАН (HERO)
   ========================================= */
.hero {
    background-color: var(--bg-primary);
    background-image: radial-gradient(circle at top right, rgba(212, 165, 116, 0.08) 0%, transparent 40%),
                      radial-gradient(circle at bottom left, rgba(212, 165, 116, 0.05) 0%, transparent 40%);
    color: var(--text-primary);
    padding: 80px 0;
    position: relative;
    overflow: hidden;
    flex-shrink: 0;
}

.hero-content {
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(320px, 420px);
    align-items: center;
    gap: 48px;
    position: relative;
    z-index: 1;
}

.hero-text { min-width: 0; }

.hero-text h1 {
    font-size: 3.3rem;
    margin-bottom: 20px;
    line-height: 1.2;
    font-weight: 800;
    max-width: 12ch;
}

.hero-text h1 span {
    background: linear-gradient(to right, var(--accent-hover), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-text p {
    font-size: 1.15rem;
    margin-bottom: 30px;
    color: var(--text-secondary);
}

.hero-form {
    width: 100%;
    max-width: 420px;
    background: var(--bg-secondary);
    padding: 32px;
    border-radius: var(--border-radius);
    color: var(--text-primary);
    border: 1px solid var(--border);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.hero-form h3 {
    margin-bottom: 20px;
    text-align: center;
    color: var(--text-primary);
}

.form-group { margin-bottom: 15px; }

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    font-size: 1rem;
    color: var(--text-primary);
    transition: all 0.2s ease;
}

.form-group input::placeholder,
.form-group textarea::placeholder { color: var(--text-secondary); }

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(212, 165, 116, 0.15);
}

.form-consent {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: 15px;
    display: flex;
    align-items: flex-start;
    gap: 8px;
}

.form-consent input[type="checkbox"] {
    accent-color: var(--accent);
    margin-top: 3px;
}

/* =========================================
   5. СЕКЦИИ И КАТЕГОРИИ
   ========================================= */
.section {
    padding: 80px 0;
    flex-shrink: 0;
}

.section-title {
    text-align: center;
    font-size: 2.2rem;
    margin-bottom: 50px;
    color: var(--text-primary);
    font-weight: 700;
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 25px;
}

.category-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    padding: 30px 20px;
    text-align: center;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    cursor: pointer;
}

.category-card:hover {
    transform: translateY(-8px) scale(1.02);
    border-color: var(--accent);
    box-shadow: 0 10px 30px rgba(212, 165, 116, 0.12);
}

.category-icon-placeholder {
    width: 100%;
    height: 150px;
    background-color: var(--bg-tertiary);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 15px;
    border: 1px dashed var(--accent);
}

.category-card h3 {
    margin-bottom: 10px;
    color: var(--text-primary);
}

.category-card a {
    color: var(--accent);
    font-weight: 600;
    font-size: 0.95rem;
}

/* =========================================
   6. ПРЕИМУЩЕСТВА И О КОМПАНИИ
   ========================================= */
.advantages {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.advantage-item {
    background: var(--bg-primary);
    padding: 30px;
    border-radius: var(--border-radius);
    border: 1px solid var(--border);
    border-left: 4px solid var(--accent);
    transition: transform 0.3s ease;
}

.advantage-item:hover { transform: translateX(5px); }

.advantage-item h3 {
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-primary);
}

.advantage-item p { color: var(--text-secondary); }

.about-content {
    display: grid;
    grid-template-columns: minmax(0, 1.4fr) minmax(320px, 0.8fr);
    gap: 40px;
    align-items: center;
}

.about-text { min-width: 0; }
.about-text p { margin-bottom: 15px; color: var(--text-secondary); }

.about-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    min-width: 0;
}

.stat-box {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    padding: 25px;
    border-radius: var(--border-radius);
    text-align: center;
    transition: border-color 0.3s, transform 0.3s;
}

.stat-box:hover {
    border-color: var(--accent);
    transform: translateY(-3px);
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--accent);
    margin-bottom: 5px;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* =========================================
   7. КАТАЛОГ ТОВАРОВ
   ========================================= */
.catalog-layout {
    display: grid;
    grid-template-columns: minmax(260px, 300px) minmax(0, 1fr);
    gap: 30px;
    align-items: start;
}

.filters-panel {
    background: var(--bg-secondary);
    padding: 18px;
    border-radius: var(--border-radius);
    border: 1px solid var(--border);
    border-right: 1px solid var(--border);
    position: sticky;
    top: 100px;
    max-height: calc(100vh - 140px);
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.filter-group { margin-bottom: 0; }
.filter-group h4 {
    color: var(--text-primary);
    margin-bottom: 10px;
    font-size: 0.95rem;
}

.filter-option {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.9rem;
    min-width: 0;
}

.filter-option input[type="checkbox"] {
    flex-shrink: 0;
    accent-color: var(--accent);
    width: 16px;
    height: 16px;
    cursor: pointer;
}

.filter-option span {
    min-width: 0;
    word-break: break-word;
}

.filter-option:hover { color: var(--text-primary); }

#reset-filters {
    width: 100%;
    margin-top: auto;
    padding: 10px 14px;
    position: sticky;
    bottom: -18px;
    background: var(--bg-secondary);
    box-shadow: 0 -10px 18px rgba(20, 20, 20, 0.95);
}

.thickness-filter {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.thickness-inputs {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.thickness-inputs label {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--text-primary);
    font-size: 0.92rem;
    font-weight: 600;
}

.thickness-inputs input[type="number"] {
    width: 84px;
    padding: 10px;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    font: inherit;
    color: var(--text-primary);
    transition: all 0.2s ease;
}

.thickness-inputs input[type="number"]::placeholder {
    color: var(--text-secondary);
}

.thickness-inputs input[type="number"]:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(212, 165, 116, 0.15);
}

.thickness-slider {
    position: relative;
    width: 100%;
    min-height: 24px;
}

.thickness-slider input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    position: absolute;
    left: 0;
    top: 50%;
    width: 100%;
    height: 4px;
    margin: 0;
    transform: translateY(-50%);
    background: transparent;
    pointer-events: none;
    z-index: 1;
}

.thickness-slider input#thickness-range-min,
.thickness-slider input#diameter-range-min {
    z-index: 2;
}

.thickness-slider input#thickness-range-max,
.thickness-slider input#diameter-range-max {
    z-index: 3;
}

.thickness-slider input[type="range"]::-webkit-slider-runnable-track {
    height: 4px;
    background: var(--bg-tertiary);
    border-radius: 999px;
}

.thickness-slider input[type="range"]::-moz-range-track {
    height: 4px;
    background: var(--bg-tertiary);
    border-radius: 999px;
}

.thickness-slider input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    border: 2px solid var(--bg-primary);
    background: var(--accent);
    box-shadow: 0 0 0 2px rgba(10, 10, 10, 0.9);
    margin-top: -7px;
    pointer-events: auto;
    cursor: pointer;
    position: relative;
    z-index: 4;
}

.thickness-slider input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    border: 2px solid var(--bg-primary);
    background: var(--accent);
    box-shadow: 0 0 0 2px rgba(10, 10, 10, 0.9);
    pointer-events: auto;
    cursor: pointer;
    position: relative;
    z-index: 4;
}

.thickness-slider input[type="range"]:focus {
    outline: none;
}

.product-grid-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    color: var(--text-secondary);
}

#product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 25px;
}

.product-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    padding: 20px;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
}

.product-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent);
    box-shadow: 0 10px 25px rgba(212, 165, 116, 0.12);
}

.product-image {
    width: 100%;
    height: 180px;
    background-color: var(--bg-tertiary);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    margin-bottom: 15px;
    border: 1px dashed var(--accent);
}

.product-card h3 {
    font-size: 1.1rem;
    margin-bottom: 15px;
    color: var(--text-primary);
    flex-grow: 1;
}

.product-specs {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 15px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border);
}

.product-specs p { margin-bottom: 5px; }
.product-specs strong { color: var(--text-primary); }

.product-price {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 15px;
}

.order-btn { width: 100%; }

/* =========================================
   8. ПОДВАЛ
   ========================================= */
footer {
    background-color: var(--bg-primary);
    color: var(--text-secondary);
    padding: 60px 0 20px;
    border-top: 1px solid var(--border);
    margin-top: auto;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-col h4 {
    color: var(--text-primary);
    margin-bottom: 20px;
    font-size: 1.1rem;
    position: relative;
    padding-bottom: 10px;
}

.footer-col h4::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 40px;
    height: 2px;
    background: var(--accent);
}

.footer-col p, .footer-col a {
    color: var(--text-secondary);
    margin-bottom: 10px;
    display: block;
    font-size: 0.95rem;
}

.footer-col a:hover {
    color: var(--accent-hover);
    padding-left: 5px;
}

.copyright {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid var(--border);
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* =========================================
   9. МОДАЛЬНОЕ ОКНО И УВЕДОМЛЕНИЯ (TOAST)
   ========================================= */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(4px);
    z-index: 1000;
    display: none;
    justify-content: center;
    align-items: center;
}

.modal-overlay.active { display: flex; }

.modal {
    background: var(--bg-secondary);
    padding: 30px;
    border-radius: var(--border-radius);
    width: 90%;
    max-width: 400px;
    position: relative;
    border: 1px solid var(--border);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    animation: modalFadeIn 0.3s ease;
}

@keyframes modalFadeIn {
    from { opacity: 0; transform: translateY(-20px) scale(0.95); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.modal-close {
    position: absolute;
    top: 15px;
    right: 15px;
    font-size: 1.5rem;
    cursor: pointer;
    background: none;
    border: none;
    color: var(--text-secondary);
    transition: color 0.2s;
}

.modal-close:hover { color: var(--text-primary); }

.toast {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    padding: 15px 25px;
    border-radius: var(--border-radius);
    z-index: 2000;
    transform: translateY(100px);
    opacity: 0;
    transition: all 0.3s ease;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
    border-left: 3px solid var(--accent);
    font-weight: 500;
}

.toast.show {
    transform: translateY(0);
    opacity: 1;
}

/* =========================================
   10. АНИМАЦИИ ПОЯВЛЕНИЯ (SCROLL)
   ========================================= */
.fade-in-up {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.fade-in-up.visible {
    opacity: 1;
    transform: translateY(0);
}

/* =========================================
   11. АДАПТИВНОСТЬ (МОБИЛЬНЫЕ)
   ========================================= */
@media (max-width: 900px) {
    .catalog-layout {
        grid-template-columns: 1fr;
    }
    .filters-panel {
        position: static;
        margin-bottom: 20px;
        max-height: none;
        overflow-y: visible;
    }
    #reset-filters {
        position: static;
        bottom: auto;
        box-shadow: none;
    }
}

@media (min-width: 1200px) {
    .hero {
        padding: 96px 0;
    }

    .section {
        padding: 96px 0;
    }

    .hero-text h1 {
        font-size: 4rem;
    }

    .hero-form {
        justify-self: end;
    }
}

@media (min-width: 1440px) {
    .container {
        max-width: 1380px;
    }

    .hero-content {
        grid-template-columns: minmax(0, 1.25fr) minmax(360px, 440px);
        gap: 56px;
    }
}

@media (max-width: 768px) {
    .container { padding: 0 16px; }

    .header-main {
        flex-wrap: wrap;
        padding: 10px 0;
    }

    .logo { font-size: 1.55rem; }
    .mobile-menu-btn {
        display: block;
        margin-left: auto;
        padding: 4px 8px;
        line-height: 1;
    }
    
    nav {
        display: none;
        width: 100%;
        margin-top: 15px;
        border-top: 1px solid var(--border);
        padding-top: 15px;
        background: var(--bg-primary);
    }
    
    nav.active { display: block; }
    nav ul { flex-direction: column; align-items: center; gap: 15px; }
    
    .header-contacts {
        text-align: center;
        width: 100%;
        margin-top: 10px;
        display: flex;
        flex-direction: column;
        align-items: center;
    }

    .phone { font-size: 1rem; }
    .hero { padding: 48px 0; }
    .hero-content { grid-template-columns: 1fr; gap: 32px; }
    .hero-text h1 { font-size: clamp(2rem, 9vw, 2.7rem); max-width: none; }
    .hero-text p { font-size: 1rem; }
    .hero-form { max-width: 100%; justify-self: stretch; }
    .section { padding: 52px 0; }
    .section-title { font-size: 1.8rem; margin-bottom: 30px; }
    .categories-grid,
    .advantages-grid { grid-template-columns: 1fr; gap: 16px; }
    .category-card,
    .advantage-item { padding: 22px 18px; }
    .about-content { grid-template-columns: 1fr; gap: 28px; }
    .about-stats { gap: 12px; }
    .stat-box { padding: 18px 10px; }
    .stat-number { font-size: 2rem; }
    .catalog-layout { gap: 18px; }
    .filters-panel { padding: 14px; }
    .product-grid-header { align-items: flex-start; gap: 12px; flex-wrap: wrap; }
    #product-grid { grid-template-columns: 1fr; gap: 16px; }
    .product-card { padding: 16px; }
    .product-image { height: 150px; }
    .footer-grid { grid-template-columns: 1fr; gap: 24px; margin-bottom: 28px; }
    footer { padding: 40px 0 18px; }
    .modal { width: calc(100% - 24px); padding: 24px 18px; }
    .toast { right: 12px; bottom: 12px; left: 12px; text-align: center; }
}

@media (max-width: 380px) {
    .about-stats { grid-template-columns: 1fr; }
    .btn { width: 100%; }
    .hero-form { padding: 22px 16px; }
}

/* Catalog page edge-to-edge header */
header {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

header .container {
    margin-bottom: 0;
    padding-bottom: 0;
}

header .header-main {
    padding-bottom: 0;
}

.section#catalog,
section#catalog {
    margin-top: 0;
    padding-top: 0;
}
/* ПРИНУДИТЕЛЬНОЕ УДАЛЕНИЕ НАТИВНОГО ТРЕКА ПОЛЗУНКА */
.thickness-slider input[type="range"]::-webkit-slider-runnable-track {
    background: transparent !important;
    border: none !important;
    box-shadow: none !important;
    height: 0 !important;
}

.thickness-slider input[type="range"]::-moz-range-track {
    background: transparent !important;
    border: none !important;
    box-shadow: none !important;
    height: 0 !important;
}

.thickness-slider input[type="range"]::-ms-track {
    background: transparent !important;
    border: none !important;
    color: transparent !important;
    height: 0 !important;
}

.thickness-slider input[type="range"]::-ms-fill-lower,
.thickness-slider input[type="range"]::-ms-fill-upper {
    background: transparent !important;
    border: none !important;
}
/* ВОССТАНОВЛЕНИЕ ЛИНИИ ПОЛЗУНКА */
.thickness-slider {
    position: relative !important;
    height: 24px !important; /* Фиксируем высоту контейнера */
    width: 100%;
}

/* Кастомная линия (трек) */
.thickness-slider::before {
    content: '' !important;
    position: absolute !important;
    top: 50% !important;
    left: 0 !important;
    width: 100% !important;
    height: 4px !important;
    background: var(--bg-tertiary, #334155) !important;
    border-radius: 2px !important;
    transform: translateY(-50%) !important;
    z-index: 0 !important;
    pointer-events: none !important;
}

/* Убедимся, что инпуты не схлопывают контейнер */
.thickness-slider input[type="range"] {
    position: absolute !important;
    top: 50% !important;
    left: 0 !important;
    width: 100% !important;
    height: 24px !important; /* Высота как у контейнера для кликабельности */
    margin: 0 !important;
    padding: 0 !important;
    background: transparent !important;
    -webkit-appearance: none !important;
    appearance: none !important;
    transform: translateY(-50%) !important;
    z-index: 1 !important;
    pointer-events: none !important;
}

/* Бегунки остаются наверху */
.thickness-slider input[type="range"]::-webkit-slider-thumb,
.thickness-slider input[type="range"]::-moz-range-thumb {
    z-index: 10 !important;
    pointer-events: all !important;
}