:root {
    --primary: #4a6fa5;
    --secondary: #166088;
    --accent: #ff6b6b;
    --light: #f8f9fa;
    --dark: #212529;
    --gray: #6c757d;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

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

body {
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--light);
    color: var(--dark);
    line-height: 1.6;
    transition: var(--transition);
    overflow-x: hidden;
}

body.dark-theme {
    background-color: #121212;
    color: #f0f0f0;
}

body.menu-open {
    overflow: hidden;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header Styles */
header {
    background-color: white;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: var(--transition);
}

body.dark-theme header {
    background-color: #1e1e1e;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: self-start;
    padding: 15px 0;
    position: relative;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 24px;
}

.logo-text {
    font-size: 24px;
    font-weight: 700;
    color: var(--secondary);
}

body.dark-theme .logo-text {
    color: #64b5f6;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 20px;
}

nav li {
    position: relative;
}

nav a {
    text-decoration: none;
    color: var(--dark);
    font-weight: 500;
    padding: 10px 15px;
    border-radius: 4px;
    transition: var(--transition);
    display: block;
}

body.dark-theme nav a {
    color: #f0f0f0;
}

nav a:hover {
    background-color: rgba(74, 111, 165, 0.1);
}

body.dark-theme nav a:hover {
    background-color: rgba(100, 181, 246, 0.1);
}

/* Вертикальные выпадающие меню (вниз) */
.submenu {
    position: absolute;
    top: 100%;
    left: 0;
    background: white;
    box-shadow: var(--shadow);
    border-radius: 4px;
    min-width: 200px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: var(--transition);
    z-index: 10;
}

body.dark-theme .submenu {
    background-color: #2d2d2d;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

nav li:hover > .submenu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.submenu li {
    width: 100%;
}

.submenu a {
    display: block;
    padding: 12px 20px;
    color: var(--dark);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    white-space: nowrap;
}

body.dark-theme .submenu a {
    color: #f0f0f0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.submenu a:last-child {
    border-bottom: none;
}

.submenu a:hover {
    background-color: rgba(74, 111, 165, 0.1);
}

body.dark-theme .submenu a:hover {
    background-color: rgba(100, 181, 246, 0.1);
}

.header-controls {
    display: flex;
    align-items: center;
    gap: 15px;
}

.auth-btn {
    background: var(--secondary);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 4px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

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

.settings-btn {
    background: transparent;
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    font-size: 20px;
}

.settings-btn:hover {
    background-color: rgba(74, 111, 165, 0.1);
}

body.dark-theme .settings-btn:hover {
    background-color: rgba(100, 181, 246, 0.1);
}

/* Боковое меню настроек */
.settings-menu {
    position: fixed;
    top: 0;
    right: -350px;
    width: 350px;
    height: 100vh;
    background: white;
    box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    transition: var(--transition);
    padding: 20px;
    display: flex;
    flex-direction: column;
}

body.dark-theme .settings-menu {
    background-color: #1e1e1e;
    box-shadow: -5px 0 15px rgba(0, 0, 0, 0.3);
}

.settings-menu.open {
    right: 0;
}

.settings-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 20px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    margin-bottom: 20px;
}

body.dark-theme .settings-header {
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.settings-header h2 {
    font-size: 24px;
    color: var(--secondary);
}

body.dark-theme .settings-header h2 {
    color: #64b5f6;
}

.close-menu {
    background: transparent;
    border: none;
    font-size: 24px;
    cursor: pointer;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.close-menu:hover {
    background-color: rgba(0, 0, 0, 0.05);
}

body.dark-theme .close-menu:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.menu-section {
    margin-bottom: 30px;
}

.menu-section h3 {
    margin-bottom: 15px;
    color: var(--secondary);
    font-size: 18px;
}

body.dark-theme .menu-section h3 {
    color: #64b5f6;
}

.menu-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 15px;
}

.menu-btn {
    width: 60px;
    height: 60px;
    border-radius: 8px;
    background: rgba(74, 111, 165, 0.1);
    border: none;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    font-size: 24px;
    text-decoration: none;
    color: inherit;
}

.menu-btn span {
    font-size: 10px;
    margin-top: 5px;
}

.menu-btn:hover {
    background: var(--primary);
    color: white;
    transform: translateY(-3px);
}

.theme-switch {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 15px;
    background: rgba(74, 111, 165, 0.1);
    border-radius: 8px;
}

body.dark-theme .theme-switch {
    background: rgba(100, 181, 246, 0.1);
}

.switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 24px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: var(--transition);
    border-radius: 24px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 16px;
    width: 16px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: var(--transition);
    border-radius: 50%;
}

input:checked + .slider {
    background-color: var(--accent);
}

input:checked + .slider:before {
    transform: translateX(26px);
}

.overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.overlay.visible {
    opacity: 1;
    visibility: visible;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #4a6fa5, #166088);
    color: white;
    padding: 80px 0;
    text-align: center;
    margin-bottom: 60px;
}

body.dark-theme .hero {
    background: linear-gradient(135deg, #1a3a5f, #0d3a56);
}

.hero h1 {
    font-size: 48px;
    margin-bottom: 20px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.hero p {
    font-size: 20px;
    max-width: 700px;
    margin: 0 auto 30px;
}

.cta-button {
    display: inline-block;
    background: white;
    color: var(--secondary);
    padding: 12px 30px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 700;
    font-size: 18px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
    transition: var(--transition);
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 15px rgba(0, 0, 0, 0.3);
}

/* Content Blocks */
.content-section {
    padding: 60px 0;
}

.section-title {
    text-align: center;
    font-size: 36px;
    margin-bottom: 50px;
    color: var(--secondary);
}

body.dark-theme .section-title {
    color: #64b5f6;
}

.blocks-container {
    display: flex;
    gap: 30px;
}

.block {
    flex: 1;
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

body.dark-theme .block {
    background-color: #1e1e1e;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

.block:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
}

.block-header {
    background: var(--primary);
    color: white;
    padding: 20px;
    text-align: center;
}

.block-content {
    padding: 30px;
}

.block h3 {
    font-size: 24px;
    margin-bottom: 20px;
}

.block p {
    margin-bottom: 15px;
}

/* Footer */
footer {
    background-color: var(--dark);
    color: white;
    padding: 40px 0 20px;
    margin-top: 60px;
}

body.dark-theme footer {
    background-color: #0d0d0d;
}

.footer-container {
    display: flex;
    justify-content: space-between;
    margin-bottom: 40px;
}

.footer-info {
    flex: 2;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
}

.footer-logo-icon {
    width: 30px;
    height: 30px;
    background: var(--accent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 16px;
}

.footer-logo-text {
    font-size: 20px;
    font-weight: 700;
}

.copyright {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 14px;
}

/* Responsive */
@media (max-width: 992px) {
    .blocks-container {
        flex-direction: column;
    }

    nav ul {
        gap: 10px;
    }
}

@media (max-width: 768px) {
    .header-container {
        flex-wrap: wrap;
        gap: 15px;
    }

    nav {
        order: 3;
        width: 100%;
    }

    nav ul {
        flex-wrap: wrap;
    }

    .hero h1 {
        font-size: 36px;
    }

    .hero p {
        font-size: 18px;
    }

    .footer-container {
        flex-direction: column;
        gap: 30px;
    }

    .settings-menu {
        width: 100%;
        right: -100%;
    }

    .menu-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 480px) {
    nav ul {
        flex-direction: column;
        gap: 5px;
    }

    .menu-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .header-controls {
        flex-wrap: wrap;
        justify-content: center;
    }
}