:root {
    --primary-color: #e50914;
    --text-color-light: #333;
    --bg-color-light: #fff;
    --header-bg-light: rgba(255, 255, 255, 0.98);
    --border-color-light: #e9ecef;
    --shadow-light: rgba(0, 0, 0, 0.05);
    --input-bg-light: #f1f3f5;
    --input-border-light: #dee2e6;
    --text-color-dark: #f0f0f0;
    --bg-color-dark: #121212;
    --header-bg-dark: rgba(20, 20, 20, 0.98);
    --border-color-dark: #2a2a2a;
    --shadow-dark: rgba(0, 0, 0, 0.25);
    --input-bg-dark: #252525;
    --input-border-dark: #444;
    --transition-speed: 0.3s ease;
}

.main-header {
    position: sticky;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    height: 65px;
    display: flex;
    align-items: center;
    transition: background-color var(--transition-speed), border-color var(--transition-speed), box-shadow var(--transition-speed);
}

.main-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

.header-left, .header-right {
    display: flex;
    align-items: center;
    gap: 15px;
}

.header-left {
    flex: 1 1 auto;
    min-width: 0;
}

.header-right {
    flex-shrink: 0;
}

.logo {
    flex-shrink: 0;
    margin-right: 25px;
    height: 40px;
    display: flex;
    align-items: center;
}

.logo-img {
    max-height: 100%;
    width: auto;
    object-fit: contain;
}

.main-nav {
    display: flex;
}

.main-nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    align-items: center;
    gap: 30px;
}

.main-nav a {
    text-decoration: none;
    font-weight: 500;
    font-size: 15px;
    position: relative;
    transition: color var(--transition-speed);
    white-space: nowrap;
}

.main-nav a:hover {
    color: var(--primary-color);
}

.main-nav .has-dropdown {
    position: relative;
    padding: 22px 0;
    margin: 0;
}

.main-nav .has-dropdown .dropdown-arrow {
    font-size: 0.7em;
    margin-left: 8px;
    transition: transform 0.2s ease;
}

.main-nav .has-dropdown.active .dropdown-arrow {
    transform: rotate(180deg);
}

.categories-submenu {
    display: none;
    position: absolute;
    top: 65px;
    left: 50%;
    transform: translateX(-50%);
    border-radius: 8px;
    padding: 15px;
    z-index: 1050;
    min-width: 780px;
    max-height: 250px;
    overflow-y: auto;
    margin-top: 0;
}

.main-nav .has-dropdown.active .categories-submenu {
    display: block;
}

.categories-grid-container {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 10px;
    padding: 0;
    list-style: none;
}

.categories-grid-container a {
    display: block;
    padding: 8px 10px;
    border-radius: 4px;
    text-align: center;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

.categories-grid-container a:hover {
    background-color: var(--primary-color);
    color: #fff !important;
}

.search-bar-container {
    display: flex;
}

.search-form {
    display: flex;
    align-items: center;
    border-radius: 20px;
    padding: 0 5px 0 15px;
    border: 1px solid;
    height: 40px;
}

.search-input {
    border: none;
    background: none;
    outline: none;
    padding: 8px 0;
    font-size: 14px;
    width: 200px;
}

.search-btn {
    background: none;
    border: none;
    font-size: 16px;
    padding: 8px;
    cursor: pointer;
}

.auth-buttons {
    display: flex;
    align-items: center;
    gap: 12px;
}

.btn {
    padding: 8px 22px;
    border-radius: 5px;
    font-size: 14px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.2s ease;
    border: 1px solid transparent;
    cursor: pointer;
    white-space: nowrap;
}

.user-profile-menu {
    position: relative;
}

.user-avatar {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    cursor: pointer;
    display: block;
    border: 2px solid transparent;
}

.user-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
}

.user-dropdown-content {
    display: none;
    position: absolute;
    top: calc(100% + 10px);
    right: 0;
    min-width: 180px;
    border-radius: 8px;
    z-index: 1050;
    padding: 8px 0;
}

.user-profile-menu:hover .user-dropdown-content {
    display: block;
}

.user-dropdown-content a {
    padding: 10px 20px;
    text-decoration: none;
    display: block;
    font-size: 15px;
}

.user-dropdown-content a.logout-link { color: var(--primary-color) !important; }
.user-dropdown-content a.logout-link:hover { background-color: var(--primary-color); color: #fff !important; }

.theme-toggle-btn {
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
    padding: 0;
    width: 38px;
    height: 38px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-icon { display: none; }
.menu-toggle-btn { display: none; }


body.light-mode .main-header { background-color: var(--header-bg-light); border-bottom: 1px solid var(--border-color-light); }
body.light-mode .main-nav a, body.light-mode .user-dropdown-content a, body.light-mode .categories-grid-container a { color: var(--text-color-light); }
body.light-mode .categories-submenu { background-color: var(--header-bg-light); box-shadow: 0 5px 15px var(--shadow-light); border: 1px solid var(--border-color-light); }
body.light-mode .search-form { border-color: var(--input-border-light); background-color: var(--input-bg-light); }
body.light-mode .search-input, body.light-mode .search-btn, body.light-mode .theme-toggle-btn { color: var(--text-color-light); }
body.light-mode .search-input::placeholder { color: #888; }
body.light-mode .btn-login { color: var(--primary-color); border-color: var(--primary-color); }
body.light-mode .btn-login:hover { background-color: var(--primary-color); color: #fff; }
body.light-mode .btn-register { background-color: var(--primary-color); color: #fff; }
body.light-mode .user-dropdown-content { background-color: var(--header-bg-light); box-shadow: 0 8px 16px var(--shadow-light); border: 1px solid var(--border-color-light); }
body.light-mode .user-dropdown-content a:hover { background-color: #f5f5f5; }
body.light-mode .logo-img.logo-light { display: block; }
body.light-mode .logo-img.logo-dark { display: none; }
body.light-mode .theme-toggle-btn .moon-icon { display: block; }

body.dark-mode .main-header { background-color: var(--header-bg-dark); border-bottom: 1px solid var(--border-color-dark); }
body.dark-mode .main-nav a, body.dark-mode .user-dropdown-content a, body.dark-mode .categories-grid-container a { color: var(--text-color-dark); }
body.dark-mode .main-nav a:hover, body.dark-mode .theme-toggle-btn:hover, body.dark-mode .search-btn:hover { color: var(--primary-color); }
body.dark-mode .categories-submenu { background-color: #181818; box-shadow: 0 5px 15px rgba(0,0,0,0.5); border: 1px solid #333; }
body.dark-mode .search-form { border-color: var(--input-border-dark); background-color: var(--input-bg-dark); }
body.dark-mode .search-input, body.dark-mode .search-btn, body.dark-mode .theme-toggle-btn { color: #ccc; }
body.dark-mode .search-input::placeholder { color: #888; }
body.dark-mode .btn-login { color: var(--primary-color); border-color: var(--primary-color); }
body.dark-mode .btn-login:hover { background-color: var(--primary-color); color: #fff; }
body.dark-mode .btn-register { background-color: var(--primary-color); color: #fff; }
body.dark-mode .user-dropdown-content { background-color: #181818; box-shadow: 0 8px 16px var(--shadow-dark); border: 1px solid #333; }
body.dark-mode .user-dropdown-content a:hover { background-color: var(--primary-color); color: #fff; }
body.dark-mode .logo-img.logo-light { display: none; }
body.dark-mode .logo-img.logo-dark { display: block; }
body.dark-mode .theme-toggle-btn .sun-icon { display: block; }

@media (max-width: 992px) {
    .main-nav, .search-bar-container, .auth-buttons, .user-profile-menu {
        display: none;
    }
    .menu-toggle-btn {
        display: block;
        color: var(--text-color-dark);
        border: none;
        background: none;
        cursor: pointer;
        font-size: 24px;
        margin-left: 15px;
    }
    body.light-mode .menu-toggle-btn { color: var(--text-color-light); }
}

.mobile-nav-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    z-index: 1999;
    visibility: hidden;
    opacity: 0;
    transition: opacity var(--transition-speed), visibility var(--transition-speed);
}
.mobile-nav-overlay.active {
    visibility: visible;
    opacity: 1;
}
.mobile-nav-menu {
    width: 280px;
    max-width: 80%;
    height: 100%;
    transform: translateX(100%);
    transition: transform var(--transition-speed);
    box-shadow: -5px 0 15px rgba(0, 0, 0, 0.2);
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    position: fixed;
    right: 0;
    top: 0;
}
.mobile-nav-overlay.active .mobile-nav-menu {
    transform: translateX(0);
}
.mobile-menu-header {
    padding: 20px;
    text-align: center;
    flex-shrink: 0;
    position: relative;
    border-bottom: 1px solid;
}
.mobile-user-info {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    font-size: 1.1em;
    font-weight: 600;
    text-decoration: none;
}
.mobile-user-info img {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    object-fit: cover;
}
.mobile-auth-buttons {
    display: flex;
    flex-direction: column;
    gap: 10px;
    width: 100%;
}
.mobile-auth-buttons .btn {
    width: 100%;
    padding: 12px;
}
.mobile-nav-menu ul {
    list-style: none;
    padding: 20px;
    margin: 0;
    flex-grow: 1;
    overflow-y: auto;
}
.mobile-nav-menu ul li {
    margin-bottom: 10px;
}
.mobile-nav-menu a {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 12px 15px;
    text-decoration: none;
    font-size: 18px;
    font-weight: 500;
    border-radius: 5px;
    transition: background-color 0.2s ease, color 0.2s ease;
}
.mobile-submenu {
    list-style: none;
    padding: 0;
    margin: 5px 0 5px 35px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease-in-out;
}
li.active-mobile-dropdown > a .mobile-dropdown-arrow {
    transform: rotate(180deg);
}
.mobile-dropdown-arrow {
    margin-left: auto;
    font-size: 0.8em;
    transition: transform 0.3s ease;
}
.mobile-nav-menu .btn-logout-mobile {
    background-color: #c0392b;
    color: #fff;
    justify-content: center;
}
body.light-mode .mobile-nav-menu { background-color: var(--bg-color-light); }
body.light-mode .mobile-menu-header { border-color: var(--border-color-light); }
body.light-mode .mobile-user-info { color: var(--text-color-light); }
body.light-mode .mobile-nav-menu a { color: var(--text-color-light); }
body.light-mode .mobile-nav-menu a:hover { background-color: rgba(0, 0, 0, 0.05); }

body.dark-mode .mobile-nav-menu { background-color: #1c1c1c; }
body.dark-mode .mobile-menu-header { border-color: var(--border-color-dark); }
body.dark-mode .mobile-user-info { color: var(--text-color-dark); }
body.dark-mode .mobile-nav-menu a { color: var(--text-color-dark); }
body.dark-mode .mobile-nav-menu a:hover { background-color: rgba(255, 255, 255, 0.08); }

@media (min-width: 993px) {
    .menu-toggle-btn, .mobile-nav-overlay {
        display: none !important;
    }
}