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

/* ========== СВЕТЛАЯ ТЕМА (По умолчанию) ========== */
:root,
html.theme-light {
    --bg-light: #f8f9fa;
    --bg-white: #ffffff;
    --bg-lighter: #f0f1f3;
    --border-color: #e0e0e0;
    --text-main: #2c3e50;
    --text-muted: #7f8c8d;
    --text-light: #95a5a6;
    --danger-red: #e74c3c;
    --danger-dark: #c0392b;
    --accent-gray: #bdc3c7;
    --navbar-bg: #ffffff;
    --card-bg: #ffffff;
    --section-bg-light: #f8f9fa;
    --section-bg-dark: #ffffff;
    --stats-bg: #ffffff;
    --transition: all 0.3s ease;
}

/* ========== ТЕМНАЯ ТЕМА ========== */
html.theme-dark {
    --bg-light: #1a1a1a;
    --bg-white: #121212;
    --bg-lighter: #2a2a2a;
    --border-color: #333333;
    --text-main: #f0f0f0;
    --text-muted: #aaaaaa;
    --text-light: #888888;
    --danger-red: #e74c3c;
    --danger-dark: #c0392b;
    --accent-gray: #555555;
    --navbar-bg: #1e1e1e;
    --card-bg: #1e1e1e;
    --section-bg-light: #121212;
    --section-bg-dark: #1e1e1e;
    --stats-bg: #2a2a2a;
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: var(--text-main);
    background-color: var(--bg-white);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* ========== КНОПКА "ВВЕРХ" ========== */
.scroll-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: 2px solid var(--danger-red);
    background-color: var(--card-bg);
    color: var(--danger-red);
    font-size: 1.2rem;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    z-index: 998;
    outline: none;
    padding: 0;
}

.scroll-to-top.show {
    opacity: 1;
    visibility: visible;
    animation: slideUp 0.4s ease-out;
}

.scroll-to-top:hover {
    transform: translateY(-5px) scale(1.1);
    box-shadow: 0 8px 20px rgba(231, 76, 60, 0.3);
    background-color: var(--danger-red);
    color: white;
}

.scroll-to-top:active {
    transform: translateY(-2px) scale(1.05);
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ========== НАВИГАЦИЯ ========== */
.navbar {
    background-color: var(--navbar-bg) !important;
    border-bottom: 2px solid var(--border-color);
    padding: 0.75rem 0;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
}

.navbar-brand {
    font-size: 1.5rem;
    letter-spacing: 1px;
    color: var(--text-main) !important;
    font-weight: 700;
    margin-right: 1rem;
}

.nav-link {
    color: var(--text-muted) !important;
    transition: var(--transition);
    margin: 0 0.5rem;
    font-weight: 500;
}

.nav-link:hover, .nav-link.active {
    color: var(--danger-red) !important;
}

/* ========== КНОПКА ПЕРЕКЛЮЧЕНИЯ ТЕМЫ ========== */
.theme-toggle-btn {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    border: 2px solid var(--danger-red);
    background-color: var(--card-bg);
    color: var(--danger-red);
    font-size: 1.1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex !important;
    align-items: center;
    justify-content: center;
    margin: 0 0.5rem;
    padding: 0;
    box-shadow: none;
}

.theme-toggle-btn:hover {
    transform: scale(1.1) rotate(20deg);
    box-shadow: 0 4px 12px rgba(231, 76, 60, 0.2);
    background-color: var(--danger-red);
    color: white;
}

.theme-toggle-btn:active {
    transform: scale(0.95);
}

.theme-toggle-btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(231, 76, 60, 0.2);
}

/* ========== HERO SECTION ========== */
.hero-section {
    background: linear-gradient(135deg, var(--section-bg-light) 0%, var(--bg-white) 100%);
    padding: 5rem 0;
    position: relative;
    overflow: hidden;
    transition: background 0.3s ease;
}

.hero-section::before {
    content: '';
    position: absolute;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(231, 76, 60, 0.05) 0%, transparent 70%);
    border-radius: 50%;
    top: -100px;
    right: -100px;
}

.hero-title {
    font-size: 2.8rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1rem;
    color: var(--text-main);
}

.hero-subtitle {
    font-size: 1.1rem;
    color: var(--text-muted);
    line-height: 1.6;
    max-width: 500px;
    margin-bottom: 1.5rem;
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.device-mockup {
    width: 260px;
    height: 320px;
    background: linear-gradient(135deg, var(--bg-lighter) 0%, var(--section-bg-light) 100%);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 100px;
    color: var(--danger-red);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.08);
    border: 2px solid var(--border-color);
    transition: all 0.3s ease;
}

.btn-danger {
    background-color: var(--danger-red);
    border-color: var(--danger-red);
    font-weight: 600;
    padding: 12px 30px;
    transition: var(--transition);
    box-shadow: 0 4px 12px rgba(231, 76, 60, 0.15);
}

.btn-danger:hover {
    background-color: var(--danger-dark);
    border-color: var(--danger-dark);
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(231, 76, 60, 0.25);
}

.btn-outline-danger {
    color: var(--danger-red);
    border-color: var(--danger-red);
    font-weight: 600;
    padding: 12px 30px;
}

.btn-outline-danger:hover {
    background-color: var(--danger-red);
    border-color: var(--danger-red);
    transform: translateY(-3px);
    color: white;
}

/* ========== SECTION STYLES ========== */
.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--text-main);
    margin-bottom: 3rem;
    position: relative;
    padding-bottom: 1rem;
}

.section-title::after {
    content: '';
    position: absolute;
    width: 80px;
    height: 4px;
    background-color: var(--danger-red);
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
}

/* ========== FEATURES SECTION ========== */
.features-section {
    background-color: var(--section-bg-dark);
    transition: background-color 0.3s ease;
}

.feature-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    border: 2px solid var(--border-color);
    border-left: 5px solid var(--danger-red);
    transition: var(--transition);
    height: 100%;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.feature-card:hover {
    transform: translateY(-8px);
    border-color: var(--danger-red);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.1);
}

.feature-icon {
    font-size: 2.5rem;
    color: var(--danger-red);
    margin-bottom: 1rem;
}

.feature-card h4 {
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 1rem;
}

.feature-card p {
    color: var(--text-muted);
    line-height: 1.7;
}

/* ========== EQUIPMENT SECTION ========== */
.equipment-section {
    background-color: var(--section-bg-light);
    transition: background-color 0.3s ease;
}

.equipment-card {
    background: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
    border: 2px solid var(--border-color);
    transition: var(--transition);
    height: 100%;
    display: flex;
    flex-direction: column;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.equipment-card:hover {
    transform: translateY(-8px);
    border-color: var(--danger-red);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.1);
}

.equipment-image {
    background: linear-gradient(135deg, var(--bg-lighter) 0%, var(--section-bg-light) 100%);
    height: 180px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-bottom: 2px solid var(--border-color);
}

.equipment-img-placeholder {
    font-size: 70px;
    color: var(--danger-red);
    opacity: 0.8;
}

.equipment-content {
    padding: 1.5rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.equipment-content h5 {
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 0.3rem;
}

.equipment-model {
    font-size: 0.9rem;
    color: var(--danger-red);
    font-weight: 600;
    margin-bottom: 0.8rem;
}

.equipment-description {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 1rem;
    flex-grow: 1;
}

.equipment-specs {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.spec-item {
    font-size: 0.85rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.spec-item i {
    color: var(--danger-red);
    font-size: 0.8rem;
}

/* ========== TECHNOLOGY SECTION ========== */
.technology-section {
    background-color: var(--section-bg-dark);
    transition: background-color 0.3s ease;
}

.tech-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    border: 2px solid var(--border-color);
    border-top: 5px solid var(--danger-red);
    text-align: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    transition: var(--transition);
    height: 100%;
}

.tech-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.1);
    border-color: var(--danger-red);
}

.tech-icon {
    font-size: 3rem;
    color: var(--danger-red);
    margin-bottom: 1rem;
}

.tech-card h5 {
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 1rem;
}

.tech-card p {
    color: var(--text-muted);
    line-height: 1.6;
}

/* ========== CONFIGURATIONS ========== */
.config-card {
    background: var(--card-bg);
    padding: 2.5rem 2rem;
    border-radius: 12px;
    border: 2px solid var(--border-color);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    transition: var(--transition);
    position: relative;
    height: 100%;
}

.config-card:hover {
    transform: translateY(-8px);
    border-color: var(--danger-red);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.1);
}

.config-premium {
    border: 3px solid var(--danger-red);
    background: linear-gradient(135deg, var(--card-bg) 0%, rgba(231, 76, 60, 0.02) 100%);
}

.config-badge {
    position: absolute;
    top: -12px;
    right: 20px;
    background: var(--danger-red);
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.config-header {
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--border-color);
}

.config-header i {
    font-size: 2rem;
    color: var(--danger-red);
    margin-right: 0.5rem;
}

.config-header h4 {
    color: var(--text-main);
    font-weight: 700;
    margin: 0;
    display: inline-block;
}

.config-list {
    margin-bottom: 1.5rem;
}

.config-item {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 0.8rem;
    color: var(--text-muted);
}

.config-footer {
    background: var(--section-bg-light);
    padding: 1rem;
    border-radius: 8px;
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-top: auto;
    border-left: 4px solid var(--danger-red);
}

/* ========== BENEFITS SECTION ========== */
.benefits-section {
    background-color: var(--section-bg-light);
    transition: background-color 0.3s ease;
}

.benefit-item {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.benefit-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--danger-red);
    min-width: 60px;
    opacity: 0.2;
}

.benefit-content h5 {
    color: var(--text-main);
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.benefit-content p {
    color: var(--text-muted);
}

.stats-card {
    background: var(--stats-bg);
    padding: 3rem 2rem;
    border-radius: 12px;
    border: 2px solid var(--border-color);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.05);
}

.stat {
    text-align: center;
    margin-bottom: 2rem;
}

.stat:last-child {
    margin-bottom: 0;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--danger-red);
    display: block;
    margin-bottom: 0.5rem;
}

.stat-text {
    font-size: 1rem;
    color: var(--text-muted);
}

/* ========== ABOUT SECTION ========== */
.about-section {
    background-color: var(--section-bg-dark);
    transition: background-color 0.3s ease;
}

.about-box {
    background: var(--section-bg-light);
    padding: 2rem;
    border-radius: 12px;
    border: 2px solid var(--border-color);
    border-top: 5px solid var(--danger-red);
    height: 100%;
    transition: var(--transition);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.about-box:hover {
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.1);
    transform: translateY(-8px);
}

.about-box h5 {
    color: var(--text-main);
    font-weight: 700;
}

.about-box p {
    color: var(--text-muted);
    line-height: 1.8;
    text-align: justify;
}

.about-list {
    list-style: none;
    padding: 0;
}

.about-list li {
    color: var(--text-muted);
    padding: 0.5rem 0 0.5rem 1.5rem;
    position: relative;
    line-height: 1.6;
}

.about-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--danger-red);
    font-weight: bold;
}

/* ========== CONTACT SECTION ========== */
.contact-section {
    background-color: var(--section-bg-light);
    transition: background-color 0.3s ease;
}

.contact-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    border: 2px solid var(--border-color);
    text-align: center;
    transition: var(--transition);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    height: 100%;
}

.contact-card:hover {
    transform: translateY(-8px);
    border-color: var(--danger-red);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.1);
}

.contact-icon {
    font-size: 3rem;
    color: var(--danger-red);
    margin-bottom: 1rem;
}

.contact-card h5 {
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 0.5rem;
}

.contact-card p {
    color: var(--text-muted);
}

.contact-card a {
    color: var(--danger-red);
    text-decoration: none;
    transition: var(--transition);
    font-weight: 600;
}

.contact-card a:hover {
    text-decoration: underline;
}

.contact-info-box {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    border: 2px solid var(--border-color);
    border-left: 5px solid var(--danger-red);
    text-align: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.contact-info-box p {
    color: var(--text-muted);
}

/* ========== FOOTER ========== */
.footer {
    background-color: var(--section-bg-dark);
    border-top: 2px solid var(--border-color);
    padding: 3rem 0 1rem;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.footer h6 {
    color: var(--text-main);
    font-weight: 700;
}

.footer-links {
    list-style: none;
    padding: 0;
}

.footer-links li {
    margin-bottom: 0.5rem;
}

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--danger-red);
}

.footer-contact {
    line-height: 1.8;
    color: var(--text-muted);
}

.footer-divider {
    border-color: var(--border-color);
    margin: 2rem 0;
}

.footer small {
    color: var(--text-light);
}

/* ========== RESPONSIVE ========== */
@media (max-width: 768px) {
    .hero-section {
        padding: 3rem 0;
    }

    .hero-title {
        font-size: 2rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .device-mockup {
        width: 200px;
        height: 260px;
        font-size: 70px;
    }

    .equipment-image {
        height: 140px;
    }

    .d-flex.gap-3 {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    .navbar {
        padding: 0.5rem 0;
    }

    .theme-toggle-btn {
        margin-right: auto;
    }

    .scroll-to-top {
        bottom: 100px;
    }
}

@media (max-width: 576px) {
    .hero-title {
        font-size: 1.6rem;
    }

    .section-title {
        font-size: 1.5rem;
    }

    .device-mockup {
        width: 160px;
        height: 220px;
        font-size: 50px;
    }

    .benefit-number {
        font-size: 2rem;
    }

    .stat-number {
        font-size: 2rem;
    }

    .equipment-image {
        height: 120px;
    }

    .equipment-img-placeholder {
        font-size: 50px;
    }

    .theme-toggle-btn {
        width: 38px;
        height: 38px;
        font-size: 0.9rem;
    }
}

/* ========== УТИЛИТЫ ========== */
.text-danger {
    color: var(--danger-red) !important;
}

.fw-bold {
    font-weight: 700;
}

.gap-3 {
    gap: 1rem;
}

.gap-4 {
    gap: 1.5rem;
}

/* ========== СТРАНИЦА ПОЛИТИКИ КОНФИДЕНЦИАЛЬНОСТИ ========== */
.privacy-section {
    background-color: var(--section-bg-dark);
    transition: background-color 0.3s ease;
    min-height: 100vh;
}

.privacy-content {
    line-height: 1.8;
}

.privacy-block {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    border-left: 5px solid var(--danger-red);
    margin-bottom: 2rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    transition: var(--transition);
}

.privacy-block:hover {
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
    transform: translateY(-4px);
}

.privacy-block h3 {
    color: var(--text-main);
    font-weight: 700;
    margin-bottom: 1.5rem;
    font-size: 1.3rem;
}

.privacy-block h4 {
    color: var(--text-main);
    font-weight: 700;
    margin-bottom: 1rem;
    margin-top: 1rem;
}

.privacy-block h5 {
    color: var(--text-main);
    font-weight: 600;
    margin-bottom: 0.8rem;
    margin-top: 1.2rem;
}

.privacy-block p {
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.privacy-list {
    list-style: none;
    padding: 0;
    margin-left: 0;
}

.privacy-list li {
    color: var(--text-muted);
    padding: 0.5rem 0;
    padding-left: 1.8rem;
    position: relative;
    line-height: 1.6;
}

.privacy-list li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--danger-red);
    font-weight: bold;
    font-size: 1.2rem;
}

.privacy-block a {
    color: var(--danger-red);
    text-decoration: none;
    transition: var(--transition);
    font-weight: 600;
}

.privacy-block a:hover {
    text-decoration: underline;
}

.contact-details {
    background: var(--section-bg-light);
    padding: 1.5rem;
    border-radius: 8px;
    border-left: 4px solid var(--danger-red);
}

.contact-details p {
    margin-bottom: 0.5rem;
    color: var(--text-light);
}

.contact-details a {
    color: var(--danger-red);
    text-decoration: none;
    font-weight: 600;
}

.contact-details a:hover {
    text-decoration: underline;
}

.privacy-footer {
    text-align: center;
}

.alert-info {
    background: linear-gradient(135deg, rgba(231, 76, 60, 0.05) 0%, rgba(231, 76, 60, 0.02) 100%);
    border: 2px solid var(--danger-red);
    border-left: 5px solid var(--danger-red);
}

.footer-links-bottom {
    list-style: none;
    padding: 0;
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
}

.footer-links-bottom li {
    margin: 0;
}

.footer-links-bottom a {
    color: var(--text-muted);
    text-decoration: none;
    transition: var(--transition);
}

.footer-links-bottom a:hover {
    color: var(--danger-red);
}

@media (max-width: 768px) {
    .privacy-block {
        padding: 1.5rem;
    }

    .privacy-block h3 {
        font-size: 1.15rem;
    }

    .footer-links-bottom {
        justify-content: flex-start;
        margin-top: 1rem;
    }
}