:root {
    --youtube-red: #FF0000;
    --youtube-dark-red: #CC0000;
    --youtube-light-red: #FF4D4D;
    --youtube-black: #282828;
    --youtube-dark-gray: #181818;
    --youtube-medium-gray: #606060;
    --youtube-light-gray: #909090;
    --youtube-border: #E5E5E5;
    --youtube-bg: #F9F9F9;
    --youtube-white: #FFFFFF;
    --text-primary: #030303;
    --text-secondary: #606060;
    --text-tertiary: #AAAAAA;
    --search-blue: #065FD4;
    --search-hover-blue: #0056b3;
    --copy-blue: #1E88E5;
    --copy-hover-blue: #1565C0;
    --card-shadow: 0 1px 2px rgba(0,0,0,0.1), 0 1px 3px rgba(0,0,0,0.05);
    --card-hover-shadow: 0 4px 8px rgba(0,0,0,0.1), 0 2px 4px rgba(0,0,0,0.06);
    --success-green: #4CAF50;
    --warning-orange: #FF9800;
    --info-blue: #2196F3;
}

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

body {
    font-family: 'Roboto', sans-serif;
    background-color: var(--youtube-bg);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 16px;
}

.container {
    width: 100%;
    max-width: 600px;
    background-color: var(--youtube-white);
    border-radius: 12px;
    box-shadow: var(--card-shadow);
    padding: 24px;
    transition: box-shadow 0.3s ease;
}

.container:hover {
    box-shadow: var(--card-hover-shadow);
}

.header {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
}

.youtube-icon {
    color: var(--youtube-red);
    font-size: 32px;
    margin-right: 12px;
}

h1 {
    font-weight: 500;
    color: var(--text-primary);
    font-size: 24px;
}

.channel-input {
    margin-bottom: 24px;
}

.input-wrapper {
    position: relative;
    margin-bottom: 8px;
}

.input-group {
    display: flex;
    border: 1px solid var(--youtube-border);
    border-radius: 8px;
    overflow: hidden;
    height: 48px;
}

input {
    flex: 1;
    padding: 0 16px;
    border: none;
    font-size: 16px;
    background-color: var(--youtube-white);
    outline: none;
    color: var(--text-primary);
    height: 100%;
}

button {
    border: none;
    cursor: pointer;
    font-weight: 500;
    font-size: 14px;
    text-transform: uppercase;
    transition: all 0.3s ease;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    white-space: nowrap;
}

.search-btn {
    background-color: var(--search-blue);
    color: var(--youtube-white);
    padding: 0 20px;
    width: 48px;
    position: relative;
    overflow: hidden;
}

.search-btn:hover {
    background-color: var(--search-hover-blue);
}

.search-btn:disabled {
    background-color: var(--text-tertiary);
    cursor: not-allowed;
}

.search-btn .btn-text {
    position: relative;
    z-index: 1;
}

.clear-btn {
    background-color: transparent;
    color: var(--text-tertiary);
    padding: 0 16px;
    display: none;
}

.clear-btn:hover {
    background-color: rgba(0, 0, 0, 0.05);
}

.input-hint {
    font-size: 12px;
    color: var(--text-tertiary);
    margin-top: 8px;
    text-align: left;
}

.error-message {
    color: var(--youtube-red);
    margin-top: 16px;
    padding: 12px 16px;
    background-color: rgba(255, 0, 0, 0.1);
    border-radius: 8px;
    display: none;
    text-align: left;
    font-size: 14px;
}

.loading {
    display: none;
    margin: 24px 0;
    text-align: center;
}

.loading-spinner {
    display: inline-block;
    width: 32px;
    height: 32px;
    border: 3px solid var(--youtube-bg);
    border-top: 3px solid var(--youtube-red);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.channel-info {
    display: none;
    margin-top: 24px;
    text-align: left;
}

.channel-header {
    display: flex;
    align-items: center;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--youtube-border);
}

.channel-avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    margin-right: 16px;
    background-color: var(--youtube-bg);
    overflow: hidden;
    flex-shrink: 0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.channel-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.channel-title {
    flex: 1;
}

.channel-name {
    font-size: 20px;
    font-weight: 500;
    margin-bottom: 4px;
    color: var(--text-primary);
}

.channel-handle-container {
    display: flex;
    align-items: center;
}

.channel-handle {
    font-size: 14px;
    color: var(--text-secondary);
    margin-right: 8px;
}

.copy-btn {
    background: none;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    font-size: 14px;
    padding: 6px;
    border-radius: 4px;
    transition: all 0.3s ease;
}

.copy-btn:hover {
    color: var(--copy-blue);
    background-color: rgba(30, 136, 229, 0.1);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    background-color: var(--youtube-bg);
    border-radius: 8px;
    padding: 16px;
    text-align: center;
    transition: all 0.3s ease;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.stat-value {
    font-size: 24px;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.stat-label {
    font-size: 12px;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.additional-info {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    margin-bottom: 24px;
}

.info-card {
    background-color: var(--youtube-bg);
    border-radius: 8px;
    padding: 16px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.info-label {
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 4px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.info-value-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.info-value {
    font-size: 14px;
    color: var(--text-primary);
    font-weight: 500;
    word-break: break-all;
    flex: 1;
    margin-right: 8px;
}

.channel-description {
    background-color: var(--youtube-bg);
    border-radius: 8px;
    padding: 16px;
    font-size: 14px;
    line-height: 1.5;
    color: var(--text-primary);
    max-height: 120px;
    overflow-y: auto;
    margin-bottom: 16px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.advanced-stats {
    margin-bottom: 24px;
}

.advanced-title {
    font-size: 16px;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.advanced-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.advanced-card {
    background-color: var(--youtube-bg);
    border-radius: 8px;
    padding: 12px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.advanced-label {
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.advanced-value {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
}

.tags-section {
    margin-bottom: 16px;
}

.tags-container {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 8px;
}

.tag {
    background-color: var(--youtube-bg);
    color: var(--text-primary);
    padding: 4px 12px;
    border-radius: 16px;
    font-size: 12px;
    border: 1px solid var(--youtube-border);
}

.share-section {
    display: flex;
    justify-content: center;
    margin-top: 16px;
}

.share-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--youtube-red);
    color: var(--youtube-white);
    border: none;
    border-radius: 8px;
    padding: 12px 24px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 2px 4px rgba(255, 0, 0, 0.2);
}

.share-btn:hover {
    background-color: var(--youtube-dark-red);
    transform: translateY(-1px);
    box-shadow: 0 4px 6px rgba(255, 0, 0, 0.3);
}

.share-btn i {
    margin-right: 8px;
}

.tooltip {
    position: relative;
    display: inline-block;
}

.tooltip .tooltiptext {
    visibility: hidden;
    width: 80px;
    background-color: var(--youtube-black);
    color: var(--youtube-white);
    text-align: center;
    border-radius: 6px;
    padding: 5px;
    position: absolute;
    z-index: 1;
    bottom: 125%;
    left: 50%;
    margin-left: -40px;
    opacity: 0;
    transition: opacity 0.3s;
    font-size: 12px;
}

.tooltip:hover .tooltiptext {
    visibility: visible;
    opacity: 1;
}

footer {
    margin-top: 40px;
    font-size: 14px;
    color: var(--text-secondary);
}

.heart {
    color: var(--youtube-red);
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.2); }
    100% { transform: scale(1); }
}

@media (max-width: 480px) {
    .container {
        padding: 16px;
    }
    
    h1 {
        font-size: 20px;
    }
    
    .channel-header {
        flex-direction: column;
        text-align: center;
    }
    
    .channel-avatar {
        margin-right: 0;
        margin-bottom: 12px;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .additional-info {
        grid-template-columns: 1fr;
    }
    
    .advanced-grid {
        grid-template-columns: 1fr;
    }
    
    .channel-handle-container {
        justify-content: center;
    }
    
    .info-value-container {
        flex-wrap: wrap;
    }
    
    .info-value {
        margin-right: 0;
        margin-bottom: 8px;
    }
}