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

body {
    font-family: 'Roboto', Arial, sans-serif;
    background-color: #0f0f0f;
    color: #ffffff;
    overflow-x: hidden;
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 16px;
    height: 56px;
    background-color: #0f0f0f;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.icon-btn {
    background: none;
    border: none;
    color: #ffffff;
    font-size: 18px;
    padding: 8px;
    cursor: pointer;
    border-radius: 50%;
}

.icon-btn:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: #ffffff;
    gap: 4px;
}

.youtube-icon {
    width: 90px;
    height: 20px;
}

.logo-text {
    font-size: 18px;
    font-weight: bold;
    letter-spacing: -0.5px;
}

.country-code {
    font-size: 12px;
    color: #aaaaaa;
    margin-left: 4px;
}

.header-center {
    display: flex;
    align-items: center;
    flex: 1;
    max-width: 600px;
    margin: 0 40px;
}

.search-container {
    display: flex;
    flex: 1;
}

.search-input {
    flex: 1;
    padding: 8px 16px;
    border: 1px solid #303030;
    border-radius: 40px 0 0 40px;
    background-color: #121212;
    color: #ffffff;
    font-size: 16px;
    outline: none;
}

.search-input:focus {
    border-color: #1c62b9;
}

.search-btn {
    padding: 8px 20px;
    background-color: #222222;
    border: 1px solid #303030;
    border-left: none;
    border-radius: 0 40px 40px 0;
    color: #ffffff;
    cursor: pointer;
}

.search-btn:hover {
    background-color: #303030;
}

.voice-btn {
    background: none;
    border: none;
    color: #ffffff;
    font-size: 18px;
    padding: 8px;
    margin-left: 8px;
    cursor: pointer;
    border-radius: 50%;
}

.voice-btn:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.header-right {
    display: flex;
    align-items: center;
    gap: 8px;
}

.sign-in-btn {
    padding: 8px 16px;
    background-color: #1c62b9;
    color: #ffffff;
    text-decoration: none;
    border-radius: 18px;
    font-size: 14px;
    font-weight: 500;
}

.sign-in-btn:hover {
    background-color: #1a5cb8;
}

/* Main Container */
.main-container {
    display: flex;
    margin-top: 56px;
    min-height: calc(100vh - 56px);
}

/* Sidebar */
.sidebar {
    width: 240px;
    background-color: #0f0f0f;
    padding: 12px;
    overflow-y: auto;
    position: fixed;
    left: 0;
    top: 56px;
    bottom: 0;
}

.sidebar-nav {
    margin-bottom: 12px;
}

.nav-item {
    display: flex;
    align-items: center;
    padding: 10px 12px;
    color: #ffffff;
    text-decoration: none;
    border-radius: 10px;
    margin-bottom: 4px;
}

.nav-item:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.nav-item.active {
    background-color: rgba(255, 255, 255, 0.1);
}

.nav-icon {
    font-size: 20px;
    margin-right: 24px;
}

.nav-text {
    font-size: 14px;
}

.sidebar-section {
    margin-bottom: 16px;
    padding-bottom: 16px;
    border-bottom: 1px solid #303030;
}

.sidebar-section:last-child {
    border-bottom: none;
}

.section-title {
    font-size: 16px;
    font-weight: 500;
    margin-bottom: 8px;
    padding: 8px 12px;
}

.sign-in-prompt {
    font-size: 14px;
    color: #aaaaaa;
    margin-bottom: 12px;
    padding: 0 12px;
}

.sign-in-link {
    display: inline-block;
    padding: 8px 16px;
    background-color: #1c62b9;
    color: #ffffff;
    text-decoration: none;
    border-radius: 18px;
    font-size: 14px;
    font-weight: 500;
    margin-left: 12px;
}

.sign-in-link:hover {
    background-color: #1a5cb8;
}

.show-more-btn {
    background: none;
    border: none;
    color: #ffffff;
    font-size: 14px;
    padding: 10px 12px;
    cursor: pointer;
    width: 100%;
    text-align: left;
    border-radius: 10px;
}

.show-more-btn:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.sidebar-footer {
    padding: 12px;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-bottom: 12px;
}

.footer-links a {
    color: #aaaaaa;
    text-decoration: none;
    font-size: 12px;
}

.footer-links a:hover {
    color: #ffffff;
}

.copyright {
    font-size: 12px;
    color: #aaaaaa;
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: 240px;
    padding: 24px;
    background-color: #0f0f0f;
}

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 400px;
    text-align: center;
}

.empty-state h2 {
    font-size: 24px;
    font-weight: 500;
    margin-bottom: 8px;
}

.empty-state p {
    font-size: 14px;
    color: #aaaaaa;
    margin-bottom: 16px;
}

.sign-in-btn-large {
    padding: 10px 24px;
    background-color: #1c62b9;
    color: #ffffff;
    text-decoration: none;
    border-radius: 18px;
    font-size: 14px;
    font-weight: 500;
}

.sign-in-btn-large:hover {
    background-color: #1a5cb8;
}

/* Responsive */
@media (max-width: 1000px) {
    .sidebar {
        width: 72px;
    }
    
    .nav-text, .section-title, .sign-in-prompt, .sign-in-link, .show-more-btn, .sidebar-footer {
        display: none;
    }
    
    .nav-item {
        justify-content: center;
        padding: 16px;
    }
    
    .nav-icon {
        margin-right: 0;
    }
    
    .main-content {
        margin-left: 72px;
    }
}

@media (max-width: 600px) {
    .header-center {
        margin: 0 16px;
    }
    
    .voice-btn {
        display: none;
    }
    
    .sidebar {
        display: none;
    }
    
    .main-content {
        margin-left: 0;
    }
}