/* Базовые переменные и сброс */
:root {
    --bg-main: #141210;
    --bg-card: #1f1c19;
    --bg-elevated: #292524;
    --text-main: #f5f5f4;
    --text-muted: #a8a29e;
    --accent: #f59e0b;
    --accent-hover: #d97706;
    --border: #44403c;
    --radius: 14px;
    --shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.6);
    --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    width: 100%;
    max-width: 1240px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Верхний баннер */
.top-banner {
    background: linear-gradient(90deg, #b45309, #d97706, #b45309);
    color: #fff;
    text-align: center;
    padding: 8px 15px;
    font-size: 0.875rem;
}

/* Шапка */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(20, 18, 16, 0.88);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 76px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--text-main);
}

.logo-icon {
    font-size: 2rem;
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-domain {
    font-family: 'JetBrains Mono', monospace;
    font-weight: 700;
    font-size: 1.15rem;
    letter-spacing: -0.5px;
    color: var(--accent);
}

.logo-sub {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.nav {
    display: flex;
    align-items: center;
    gap: 28px;
}

.nav-link {
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--accent);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.cart-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    color: var(--text-main);
    padding: 10px 16px;
    border-radius: 10px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.9rem;
    transition: var(--transition);
}

.cart-btn:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
}

.cart-badge {
    background: var(--accent);
    color: #000;
    font-weight: 700;
    padding: 2px 7px;
    border-radius: 20px;
    font-size: 0.75rem;
}

.burger-btn {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 20px;
    background: transparent;
    border: none;
    cursor: pointer;
}

.burger-btn span {
    display: block;
    height: 2.5px;
    width: 100%;
    background: var(--text-main);
    border-radius: 2px;
    transition: var(--transition);
}

/* Герой-секция */
.hero {
    padding: 80px 0;
    position: relative;
    overflow: hidden;
}

.hero-inner {
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
    gap: 48px;
    align-items: center;
}

.badge {
    display: inline-block;
    background: rgba(245, 158, 11, 0.15);
    color: var(--accent);
    border: 1px solid rgba(245, 158, 11, 0.3);
    padding: 6px 14px;
    border-radius: 30px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 20px;
}

.hero-content h1 {
    font-size: clamp(2.2rem, 4.5vw, 3.6rem);
    line-height: 1.12;
    font-weight: 800;
    margin-bottom: 20px;
}

.hero-content p {
    font-size: 1.1rem;
    color: var(--text-muted);
    margin-bottom: 32px;
    max-width: 580px;
}

.hero-btns {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-bottom: 44px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 28px;
    border-radius: 10px;
    font-weight: 600;
    font-size: 1rem;
    text-decoration: none;
    cursor: pointer;
    border: none;
    transition: var(--transition);
}

.btn-primary {
    background: var(--accent);
    color: #141210;
}

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
}

.btn-secondary {
    background: var(--bg-elevated);
    color: var(--text-main);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    border-color: var(--text-muted);
    transform: translateY(-2px);
}

.btn-full {
    width: 100%;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    padding-top: 28px;
    border-top: 1px solid var(--border);
}

.stat-num {
    display: block;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--accent);
    font-family: 'JetBrains Mono', monospace;
}

.stat-desc {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.stone-showcase {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.stone-svg {
    width: 100%;
    max-width: 380px;
    animation: floatStone 5s ease-in-out infinite;
}

@keyframes floatStone {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-14px) rotate(2deg); }
}

.floating-tag {
    position: absolute;
    background: rgba(31, 28, 25, 0.9);
    border: 1px solid var(--border);
    padding: 8px 14px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    box-shadow: var(--shadow);
}

.tag-1 { top: 10%; left: 0; }
.tag-2 { bottom: 15%; right: 0; color: var(--accent); }
.tag-3 { top: 20%; right: 5%; }

/* Общие заголовки секций */
section {
    padding: 72px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 48px;
}

.section-header h2 {
    font-size: clamp(1.8rem, 3.5vw, 2.5rem);
    font-weight: 800;
    margin-bottom: 12px;
}

.section-header p {
    color: var(--text-muted);
    font-size: 1.05rem;
}

/* Фильтры и Каталог */
.filters {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 36px;
}

.filter-btn {
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-muted);
    padding: 10px 20px;
    border-radius: 30px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.9rem;
    transition: var(--transition);
}

.filter-btn:hover,
.filter-btn.active {
    background: var(--accent);
    color: #141210;
    border-color: var(--accent);
}

.catalog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
    gap: 26px;
}

.product-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: var(--transition);
}

.product-card:hover {
    transform: translateY(-6px);
    border-color: var(--accent);
    box-shadow: var(--shadow);
}

.product-visual {
    height: 190px;
    background: radial-gradient(circle at center, #35302c 0%, #1c1917 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding: 20px;
}

.product-badge {
    position: absolute;
    top: 12px;
    left: 12px;
    background: rgba(20, 18, 16, 0.85);
    border: 1px solid var(--border);
    color: var(--accent);
    font-size: 0.75rem;
    font-weight: 600;
    padding: 4px 10px;
    border-radius: 20px;
}

.product-weight {
    position: absolute;
    bottom: 12px;
    right: 12px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.78rem;
    color: var(--text-muted);
    background: rgba(0, 0, 0, 0.5);
    padding: 3px 8px;
    border-radius: 6px;
}

.product-body {
    padding: 22px;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.product-title {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.product-desc {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 20px;
    flex-grow: 1;
}

.product-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 16px;
    border-top: 1px solid var(--border);
}

.product-price {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-main);
}

.add-to-cart {
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    color: var(--text-main);
    padding: 9px 16px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.88rem;
    transition: var(--transition);
}

.add-to-cart:hover {
    background: var(--accent);
    color: #141210;
    border-color: var(--accent);
}

/* Преимущества */
.features-section {
    background: #181512;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    padding: 28px;
    border-radius: var(--radius);
}

.feature-icon {
    font-size: 2.2rem;
    margin-bottom: 16px;
}

.feature-card h3 {
    font-size: 1.15rem;
    margin-bottom: 10px;
}

.feature-card p {
    color: var(--text-muted);
    font-size: 0.92rem;
}

/* Калькулятор */
.calc-box {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 40px;
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 40px;
    align-items: center;
}

.calc-info h2 {
    font-size: 1.9rem;
    margin-bottom: 12px;
}

.calc-info p {
    color: var(--text-muted);
    margin-bottom: 24px;
}

.calc-controls {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.calc-controls label {
    display: flex;
    flex-direction: column;
    gap: 8px;
    font-size: 0.95rem;
}

.calc-controls select,
.calc-controls input[type="range"] {
    width: 100%;
    padding: 12px;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    color: var(--text-main);
    border-radius: 8px;
    font-size: 0.95rem;
}

.calc-controls input[type="range"] {
    accent-color: var(--accent);
    padding: 0;
}

.checkbox-label {
    flex-direction: row !important;
    align-items: center;
    cursor: pointer;
}

.checkbox-label input {
    width: 18px;
    height: 18px;
    accent-color: var(--accent);
}

.calc-receipt {
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    padding: 28px;
    border-radius: var(--radius);
}

.calc-receipt h3 {
    margin-bottom: 20px;
    font-size: 1.25rem;
}

.receipt-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 12px;
    font-size: 0.92rem;
    color: var(--text-muted);
}

.receipt-row strong {
    color: var(--text-main);
}

.receipt-divider {
    height: 1px;
    background: var(--border);
    margin: 20px 0;
}

.receipt-total {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 24px;
}

.total-price {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--accent);
}

/* Отзывы */
.reviews-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.review-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    padding: 28px;
    border-radius: var(--radius);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.review-header {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 16px;
}

.review-avatar {
    width: 46px;
    height: 46px;
    border-radius: 50%;
    background: var(--accent);
    color: #141210;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
}

.review-meta {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.review-card p {
    color: var(--text-muted);
    font-style: italic;
    margin-bottom: 16px;
}

.review-rating {
    color: var(--accent);
    letter-spacing: 2px;
}

/* Подвал */
.footer {
    background: #0e0c0a;
    border-top: 1px solid var(--border);
    padding-top: 60px;
}

.footer-inner {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1.2fr;
    gap: 40px;
    padding-bottom: 40px;
}

.footer-desc {
    color: var(--text-muted);
    margin-top: 14px;
    font-size: 0.9rem;
    max-width: 340px;
}

.footer-col h4 {
    margin-bottom: 16px;
    font-size: 1.05rem;
}

.footer-col a,
.footer-col p {
    display: block;
    color: var(--text-muted);
    text-decoration: none;
    margin-bottom: 10px;
    font-size: 0.9rem;
}

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

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

/* Модалка корзины */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(4px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 200;
    padding: 20px;
}

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

.modal {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    width: 100%;
    max-width: 520px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border);
}

.close-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.8rem;
    cursor: pointer;
    line-height: 1;
}

.modal-body {
    padding: 24px;
    max-height: 360px;
    overflow-y: auto;
}

.cart-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 14px;
    margin-bottom: 14px;
    border-bottom: 1px solid var(--border);
}

.cart-item-title {
    font-weight: 600;
    font-size: 0.95rem;
}

.cart-item-sub {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.remove-item {
    background: none;
    border: none;
    color: #ef4444;
    cursor: pointer;
    font-size: 0.85rem;
}

.modal-footer {
    padding: 20px 24px;
    background: var(--bg-elevated);
    border-top: 1px solid var(--border);
}

.cart-summary {
    display: flex;
    justify-content: space-between;
    margin-bottom: 16px;
    font-size: 0.95rem;
}

/* Toast */
.toast {
    position: fixed;
    bottom: 24px;
    right: 24px;
    background: var(--accent);
    color: #141210;
    padding: 14px 22px;
    border-radius: 10px;
    font-weight: 700;
    box-shadow: var(--shadow);
    transform: translateY(120px);
    opacity: 0;
    transition: var(--transition);
    z-index: 300;
}

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

/* Адаптивность под планшеты и мобильные девайсы */
@media (max-width: 960px) {
    .hero-inner {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-content p {
        margin-left: auto;
        margin-right: auto;
    }

    .hero-btns {
        justify-content: center;
    }

    .calc-box {
        grid-template-columns: 1fr;
        padding: 28px;
    }

    .footer-inner {
        grid-template-columns: 1fr;
        gap: 28px;
    }
}

@media (max-width: 768px) {
    .burger-btn {
        display: flex;
    }

    .nav {
        position: absolute;
        top: 76px;
        left: 0;
        right: 0;
        background: var(--bg-card);
        border-bottom: 1px solid var(--border);
        flex-direction: column;
        padding: 20px;
        gap: 16px;
        display: none;
    }

    .nav.active {
        display: flex;
    }

    .hero {
        padding: 48px 0;
    }

    .hero-stats {
        grid-template-columns: 1fr;
        gap: 14px;
    }

    .floating-tag {
        font-size: 0.7rem;
        padding: 6px 10px;
    }
}