/*
* Стили для сайта DRONE-DETECTOR-TDOA-FD1.RU
* Версия 2.0 - Modern
*/

/* 1. ГЛОБАЛЬНЫЕ СТИЛИ И ПЕРЕМЕННЫЕ
-------------------------------------------------- */
:root {
    --bg-dark-1: #0D1117;   /* Основной фон */
    --bg-dark-2: #161B22;   /* Фон карточек и секций */
    --border-color: #30363d; /* Цвет границ */
    --text-primary: #E6EDF3; /* Основной текст */
    --text-secondary: #8B949E;/* Второстепенный текст */
    --accent-blue: #388BFD;   /* Яркий акцент */
    --accent-blue-hover: #58A6FF;/* Акцент при наведении */
    --status-green: #238636;  /* Цвет для статуса "В наличии" */
    --font-heading: 'Exo 2', sans-serif;
    --font-body: 'Inter', sans-serif;
    --shadow-glow: 0 0 15px rgba(56, 139, 253, 0.2);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px; /* Отступ для якорей из-за липкой шапки */
}

body {
    font-family: var(--font-body);
    background-color: var(--bg-dark-1);
    color: var(--text-primary);
    line-height: 1.65;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

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

section {
    padding: 100px 0;
    overflow: hidden;
}

h1, h2, h3 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.3;
}

.section-title {
    font-size: 42px;
    text-align: center;
    margin-bottom: 60px;
}

.section-title.left-aligned {
    text-align: left;
}

a {
    color: var(--accent-blue);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

.cta-button {
    display: inline-block;
    background-color: var(--accent-blue);
    color: #fff;
    padding: 12px 28px;
    border-radius: 8px;
    font-weight: 600;
    text-align: center;
    transition: all 0.3s ease;
    border: 1px solid var(--accent-blue);
}
.cta-button:hover {
    background-color: var(--accent-blue-hover);
    border-color: var(--accent-blue-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(88, 166, 255, 0.2);
    color: #fff;
}
.cta-button.large {
    padding: 16px 40px;
    font-size: 18px;
}


/* 2. ШАПКА САЙТА (HEADER)
-------------------------------------------------- */
.site-header {
    background: rgba(22, 27, 34, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    width: 100%;
    z-index: 1000;
}
.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}
.logo {
    font-family: var(--font-heading);
    font-size: 32px;
    font-weight: 800;
    color: var(--text-primary);
}
.logo:hover { color: var(--text-primary); }
.nav-list { display: flex; gap: 35px; }
.nav-list a {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 16px;
    position: relative;
    padding: 5px 0;
}
.nav-list a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background-color: var(--accent-blue);
    transition: width 0.3s ease;
}
.nav-list a:hover { color: var(--text-primary); }
.nav-list a:hover::after { width: 100%; }
.burger-menu {
    display: none;
    flex-direction: column;
    justify-content: space-around;
    width: 30px;
    height: 24px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 10;
}
.burger-line {
    width: 30px;
    height: 3px;
    background-color: var(--text-primary);
    border-radius: 10px;
    transition: all 0.3s linear;
    position: relative;
    transform-origin: 1px;
}

/* 3. СТИЛИ БЛОКОВ (SECTIONS)
-------------------------------------------------- */

/* HERO SECTION */
.hero-section {
    padding-top: 80px;
    padding-bottom: 80px;
}
.hero-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: 60px;
}
.hero-tagline {
    display: inline-block;
    background: rgba(56, 139, 253, 0.1);
    color: var(--accent-blue-hover);
    padding: 5px 15px;
    border-radius: 30px;
    font-weight: 600;
    margin-bottom: 20px;
}
.hero-content h1 {
    font-size: 52px;
    margin-bottom: 20px;
}
.hero-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 40px;
    max-width: 550px;
}
.hero-benefits { display: flex; gap: 20px; }
.hero-benefit-item {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-secondary);
    font-weight: 500;
}
.hero-benefit-item i { color: var(--accent-blue); }
.hero-image-wrapper img {
    border-radius: 16px;
    box-shadow: 0 20px 50px rgba(0,0,0,0.3);
}

/* SPECIFICATIONS SECTION */
.specifications-section { background: var(--bg-dark-2); }
.tabs { max-width: 900px; margin: 0 auto; }
.tab-buttons {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 40px;
}
.tab-button {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 25px;
    background: var(--bg-dark-1);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    border-radius: 8px;
    transition: all 0.3s ease;
}
.tab-button:hover {
    background: var(--bg-dark-2);
    color: var(--text-primary);
    border-color: var(--accent-blue);
}
.tab-button.active {
    background-color: var(--accent-blue);
    color: #fff;
    border-color: var(--accent-blue);
}
.tab-content { display: none; }
.tab-content.active { display: block; animation: fadeIn 0.5s ease; }
.spec-list {
    background: var(--bg-dark-1);
    padding: 40px;
    border-radius: 12px;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 25px;
}
.spec-list li {
    font-size: 17px;
    color: var(--text-secondary);
}
.spec-list li strong { color: var(--text-primary); }

/* ABOUT PRODUCT SECTION */
.about-product-container { display: grid; grid-template-columns: 1fr 1fr; align-items: center; gap: 80px; }
.about-product-text h2 { margin-bottom: 20px; }
.about-product-text p { margin-bottom: 30px; color: var(--text-secondary); max-width: 500px; }
.about-product-image img { border-radius: 16px; }

/* ADVANTAGES SECTION */
.advantages-section { background: var(--bg-dark-2); }
.advantages-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}
.advantage-card {
    background: var(--bg-dark-1);
    padding: 30px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}
.advantage-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-blue);
    box-shadow: var(--shadow-glow);
}
.advantage-icon {
    font-size: 24px;
    width: 50px;
    height: 50px;
    border-radius: 8px;
    display: grid;
    place-items: center;
    background: rgba(56, 139, 253, 0.1);
    color: var(--accent-blue);
    margin-bottom: 20px;
}
.advantage-card h3 { font-size: 22px; margin-bottom: 10px; }
.advantage-card p { color: var(--text-secondary); }

/* BOX SECTION */
.box-container { display: grid; grid-template-columns: repeat(2, 1fr); gap: 30px; }
.box-column { background: var(--bg-dark-2); padding: 40px; border-radius: 16px; }
.box-column h3 { font-size: 24px; margin-bottom: 25px; }
.box-column ul { display: flex; flex-direction: column; gap: 15px; }
.box-column li {
    position: relative;
    padding-left: 30px;
    font-size: 17px;
}
.box-column li::before {
    content: '\f058';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    position: absolute;
    left: 0;
    top: 4px;
    color: var(--status-green);
}

/* PRICES SECTION */
.price-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0 10px;
}
.price-row {
    display: grid;
    grid-template-columns: 3fr 2fr 2fr 1fr;
    align-items: center;
    background: var(--bg-dark-2);
    border-radius: 10px;
    padding: 15px 30px;
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
}
.price-row:not(.header):hover {
    transform: scale(1.02);
    border-color: var(--accent-blue);
}
.price-row.header { background: none; font-weight: 600; color: var(--text-secondary); border: none; padding-bottom: 0; }
.price-row.highlight {
    border-color: var(--accent-blue);
    box-shadow: var(--shadow-glow);
}
.price-cell { font-size: 18px; font-weight: 500; }
.price-row.highlight .price-cell:first-child { color: var(--accent-blue); font-weight: 600; }
.price-row.highlight .price-cell:first-child i { margin-right: 8px; }
.status-badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 30px;
    font-size: 14px;
    font-weight: 600;
}
.status-badge.stock { background: rgba(35, 134, 54, 0.2); color: #3CC355; }
.status-badge.order { background: rgba(255, 165, 0, 0.2); color: #FFA500; }
.price-button {
    padding: 8px 20px;
    font-size: 15px;
    font-weight: 600;
    border-radius: 6px;
}
.price-button.primary { background: var(--accent-blue); color: #fff; }
.price-button.primary:hover { background: var(--accent-blue-hover); color: #fff; }
.price-button.secondary { background: var(--bg-dark-1); color: var(--text-primary); border: 1px solid var(--border-color); }
.price-button.secondary:hover { background: var(--bg-dark-2); border-color: var(--text-primary); }

/* FAQ SECTION */
.faq-section { background: var(--bg-dark-2); }
.faq-container { display: grid; grid-template-columns: 1fr 2fr; gap: 60px; align-items: flex-start; }
.faq-content p { color: var(--text-secondary); margin-top: 20px; }
.faq-accordion { display: flex; flex-direction: column; gap: 15px; }
.faq-item { background: var(--bg-dark-1); border-radius: 10px; border: 1px solid var(--border-color); }
.faq-question {
    width: 100%;
    background: none;
    border: none;
    padding: 20px 25px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}
.faq-question i { transition: transform 0.3s ease; }
.faq-answer { max-height: 0; overflow: hidden; transition: all 0.4s ease-out; }
.faq-answer p { padding: 0 25px 20px; color: var(--text-secondary); border-top: 1px solid var(--border-color); padding-top: 20px;}
.faq-item.active .faq-question i { transform: rotate(45deg); color: var(--accent-blue); }
.faq-item.active .faq-answer { max-height: 200px; }


/* REVIEWS SECTION */
.reviews-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.review-card {
    background: var(--bg-dark-2);
    padding: 30px;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    position: relative;
}
.review-card::before {
    content: '\f10d';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    position: absolute;
    top: 30px;
    right: 30px;
    color: var(--border-color);
    font-size: 32px;
}
.review-text { font-size: 17px; margin-bottom: 25px; }
.review-author { border-top: 1px solid var(--border-color); padding-top: 20px; }
.review-author cite { font-style: normal; font-weight: 600; display: block; }
.review-author span { color: var(--text-secondary); font-size: 14px; }


/* CONTACTS SECTION (CTA) */
.contacts-section { background: var(--bg-dark-2); }
.contacts-container { text-align: center; }
.contacts-container h2 { font-size: 36px; max-width: 600px; margin: 0 auto 20px; }
.contacts-container p { max-width: 600px; margin: 0 auto 40px; color: var(--text-secondary); }

/* 4. ФУТЕР (FOOTER)
-------------------------------------------------- */
.site-footer {
    background: var(--bg-dark-1);
    padding: 50px 0;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
}
.footer-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 30px;
}
.footer-logo { font-family: var(--font-heading); font-size: 28px; font-weight: 800; color: var(--text-primary); }
.footer-contacts p { margin-bottom: 5px; }
.footer-contacts i { margin-right: 10px; }
.footer-copyright { font-size: 14px; text-align: right; }

/* 5. АДАПТИВНОСТЬ (MEDIA QUERIES)
-------------------------------------------------- */
@media (max-width: 1024px) {
    .section-title { font-size: 36px; }
    .hero-content h1 { font-size: 44px; }
    .advantages-grid, .reviews-grid { grid-template-columns: repeat(2, 1fr); }
    .faq-container { grid-template-columns: 1fr; }
    .faq-content { text-align: center; }
    .faq-content .section-title { text-align: center; }
    .price-row { grid-template-columns: 2fr 1.5fr; gap: 20px; padding: 20px; }
    .price-cell:nth-child(3), .price-cell:nth-child(4) { grid-column: span 2; text-align: center; }
    .price-cell[data-label] { display: flex; justify-content: space-between; align-items: center; }
    .price-cell[data-label]::before { content: attr(data-label); font-weight: 600; color: var(--text-secondary); margin-right: 10px; }
    .price-row.header, .price-cell:nth-child(4) { display: none; }
    .price-cell:nth-child(3) { grid-column: initial; text-align: left; }
    .price-row { display: flex; flex-direction: column; align-items: stretch; gap: 15px; }
    .price-cell { text-align: left !important; }
}

@media (max-width: 768px) {
    html { scroll-padding-top: 70px; }
    .site-header .header-container { height: 70px; }
    .main-nav {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: var(--bg-dark-2);
        flex-direction: column;
        padding: 20px 0;
        border-bottom: 1px solid var(--border-color);
    }
    .main-nav.active { display: flex; }
    .nav-list { flex-direction: column; align-items: center; gap: 20px; }
    .burger-menu { display: flex; }
    .header-cta { display: none; }
    .hero-container, .about-product-container { grid-template-columns: 1fr; text-align: center; }
    .hero-content { order: 2; }
    .hero-image-wrapper { order: 1; margin-bottom: 40px; }
    .hero-benefits { justify-content: center; }
    .about-product-text h2, .section-title.left-aligned { text-align: center; }
    .about-product-image { order: 1; margin-bottom: 40px; }
    .about-product-text { order: 2; display: flex; flex-direction: column; align-items: center; }
    .advantages-grid, .reviews-grid, .box-container { grid-template-columns: 1fr; }
    .spec-list { grid-template-columns: 1fr; }
    .footer-container { flex-direction: column; text-align: center; }
    .footer-copyright { text-align: center; }
}