:root {
    --color-primary: #3188eb;
    --color-primary-hover: #317de1;
    --color-primary-light: #f1f8ff;
    --color-bg: #ffffff;
    --color-bg-secondary: #f6f8fa;
    --color-bg-tertiary: #fafbfc;
    --color-text: #24292e;
    --color-text-secondary: #586069;
    --color-text-tertiary: #6a737d;
    --color-border: #e1e4e8;
    --color-border-light: #eaecef;
    --color-success: #10b981;
    --color-success-bg: #d1fae5;
    --color-warning: #f59e0b;
    --color-warning-bg: #fef3c7;
    --color-error: #ef4444;
    --color-error-bg: #fee2e2;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.05);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.1), 0 4px 6px rgba(0,0,0,0.05);
    --shadow-xl: 0 20px 25px rgba(0,0,0,0.1), 0 10px 10px rgba(0,0,0,0.04);
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;
    --ease-out: cubic-bezier(0.05, 0.7, 0.1, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
    --duration-fast: 150ms;
    --duration-normal: 250ms;
    --duration-slow: 350ms;
}

:root[data-theme="dark"] {
    --color-bg: #0d1117;
    --color-bg-secondary: #161b22;
    --color-bg-tertiary: #21262d;
    --color-text: #c9d1d9;
    --color-text-secondary: #8b949e;
    --color-text-tertiary: #6e7681;
    --color-border: #30363d;
    --color-border-light: #21262d;
    --color-primary: #58a6ff;
    --color-primary-hover: #79b8ff;
    --color-primary-light: #388bfd26;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.4);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.5);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
*:focus { outline: none; }

body {
    font-family: 'Google Sans', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* 顶部应用栏 */
.top-app-bar {
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
    animation: slideDown var(--duration-slow) var(--ease-out);
}

.app-bar-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 16px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.app-bar-left {
    display: flex;
    align-items: center;
    gap: 16px;
    flex: 1;
    min-width: 0;
}

.back-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    background-color: var(--color-bg-secondary);
    color: var(--color-text);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--duration-fast) ease;
    text-decoration: none;
    flex-shrink: 0;
}

.back-btn:hover {
    background-color: var(--color-bg-tertiary);
    border-color: var(--color-primary);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.back-btn:active { transform: translateY(0); }

.app-title {
    font-family: 'Google Sans Display', 'Noto Sans SC', sans-serif;
    font-size: 20px;
    font-weight: 600;
    color: var(--color-text);
    letter-spacing: -0.3px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* 用户区域 */
.user-area {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
    position: relative;
}

.login-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--color-primary);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s ease;
}

.login-avatar:hover {
    background: var(--color-primary-hover);
    transform: scale(1.05);
}

.user-info-container {
    position: relative;
    display: flex;
    align-items: center;
}

.user-avatar-wrapper { position: relative; }

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
    cursor: pointer;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 2px solid transparent;
    display: block;
}

.user-avatar-wrapper:hover .user-avatar {
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(3, 102, 214, 0.4);
    border-color: var(--color-primary);
}

.user-menu {
    position: absolute;
    top: calc(100% + 10px);
    right: 0;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    min-width: 240px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s ease;
    z-index: 1000;
    padding: 8px;
    pointer-events: none;
}

.user-menu.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
}

.user-menu-header {
    text-align: center;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--color-border);
    margin-bottom: 12px;
}

.user-menu-avatar {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    margin: 0 auto 8px;
    display: block;
    border: 2px solid var(--color-primary);
}

.user-menu-name {
    color: var(--color-primary);
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 8px;
}

.user-menu-badge {
    display: inline-block;
    padding: 4px 12px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-hover));
    color: white;
    border-radius: 20px;
    font-size: 12px;
}

.user-menu-items {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.user-menu-item {
    display: flex;
    align-items: center;
    padding: 10px 12px;
    color: var(--color-text);
    text-decoration: none;
    border-radius: 6px;
    transition: background-color 0.2s ease;
    border: none;
    background: none;
    cursor: pointer;
    font-size: 14px;
    width: 100%;
    text-align: left;
    font-family: inherit;
}

.user-menu-item:hover { background-color: var(--color-bg-secondary); }

.user-menu-divider {
    height: 1px;
    background: var(--color-border);
    margin: 8px 0;
}

.theme-menu-item { position: relative; }

.theme-submenu {
    position: absolute;
    right: calc(100% + 8px);
    top: 0;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    padding: 4px;
    min-width: 120px;
    opacity: 0;
    visibility: hidden;
    transform: translateX(-10px);
    transition: all 0.2s ease;
}

.theme-menu-item:hover .theme-submenu {
    opacity: 1;
    visibility: visible;
    transform: translateX(0);
}

.theme-submenu-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    color: var(--color-text);
    background: none;
    border: none;
    width: 100%;
    text-align: left;
    font-family: inherit;
}

.theme-submenu-item:hover { background-color: var(--color-bg-secondary); }

.theme-check {
    margin-left: auto;
    color: var(--color-primary);
    font-weight: bold;
}

/* 主内容区域 */
.main-container {
    flex: 1;
    max-width: 900px;
    width: 100%;
    margin: 0 auto;
    padding: 32px 24px;
    padding-bottom: 120px;
}

/* 卡片样式 */
.card {
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: 24px;
    margin-bottom: 24px;
    box-shadow: var(--shadow-md);
    transition: box-shadow var(--duration-normal) var(--ease-out), transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    animation: fadeInUp var(--duration-slow) var(--ease-out);
}

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

.card-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.card-title .material-icons-round {
    color: var(--color-primary);
    font-size: 20px;
}

/* 使用说明 */
.instructions {
    background-color: var(--color-primary-light);
    border-left: 4px solid var(--color-primary);
    padding: 16px;
    border-radius: var(--radius-md);
    margin-bottom: 20px;
}

.instructions p {
    margin: 6px 0;
    color: var(--color-text-secondary);
    font-size: 14px;
}

.instructions p strong {
    color: var(--color-text);
}

/* 输入组 */
.input-group {
    display: flex;
    align-items: center;
    gap: 0;
    margin-bottom: 16px;
}

.input-wrapper {
    position: relative;
    flex: 1;
    display: flex;
    align-items: center;
}

.input-wrapper .material-icons-round {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-tertiary);
    font-size: 20px;
    pointer-events: none;
    transition: color var(--duration-fast) ease;
    z-index: 10;
}

.text-input {
    width: 100%;
    padding: 12px 14px;
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md) 0 0 var(--radius-md);
    font-size: 15px;
    color: var(--color-text);
    transition: all var(--duration-fast) ease;
    font-family: inherit;
}

.text-input::placeholder { color: var(--color-text-tertiary); }

.text-input:hover {
    border-color: var(--color-primary);
    background-color: var(--color-bg);
}

.text-input:focus {
    border-color: var(--color-primary);
    background-color: var(--color-bg);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

.input-wrapper:focus-within .material-icons-round { color: var(--color-primary); }

.action-button {
    padding: 13px 24px;
    background-color: var(--color-primary);
    color: #ffffff;
    border: 1px solid var(--color-primary);
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--duration-fast) ease;
    box-shadow: var(--shadow-sm);
    font-family: inherit;
    display: flex;
    align-items: center;
    gap: 6px;
    white-space: nowrap;
    line-height: 1.5;
}

.action-button:hover:not(:disabled) {
    background-color: var(--color-primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.action-button:active:not(:disabled) { transform: translateY(0); }

.action-button:disabled {
    background-color: var(--color-bg-tertiary);
    color: var(--color-text-tertiary);
    border-color: var(--color-border);
    box-shadow: none;
    cursor: not-allowed;
}

/* 选项组 */
.options-group {
    margin-bottom: 20px;
}

.options-group-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 12px;
}

.options-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.option-item {
    display: flex;
    align-items: center;
    padding: 10px 16px;
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--duration-fast) ease;
    font-size: 14px;
}

.option-item:hover {
    background-color: var(--color-bg-tertiary);
    border-color: var(--color-primary);
    transform: translateY(-1px);
}

.option-item input[type="radio"] {
    margin-right: 8px;
    accent-color: var(--color-primary);
    cursor: pointer;
}

.option-item input[type="radio"]:checked + span {
    color: var(--color-primary);
    font-weight: 500;
}

.option-item:has(input[type="radio"]:checked) {
    background-color: var(--color-primary-light);
    border-color: var(--color-primary);
}

/* 复选框样式 */
.checkbox-wrapper {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 8px;
    font-size: 13px;
    color: var(--color-text-secondary);
    cursor: pointer;
}

.checkbox-wrapper input[type="checkbox"] {
    accent-color: var(--color-primary);
    cursor: pointer;
}

/* 加载动画 */
.mini-spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top: 2px solid currentColor;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-right: 8px;
}

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

/* 搜索结果 */
.search-results-container {
    display: none;
    max-height: 400px;
    overflow-y: auto;
    margin-top: 16px;
    margin-bottom: 0;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background-color: var(--color-bg);
    position: relative;
    z-index: 10;
}

/* 卡片内的搜索结果容器 */
.card .search-results-container {
    margin-top: 16px;
}

.search-results-container[style*="block"] {
    display: block !important;
}

.search-results-list {
    padding: 12px;
}

.search-result-item {
    padding: 16px;
    margin-bottom: 12px;
    background-color: var(--color-bg-secondary);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--duration-fast) ease;
    box-shadow: var(--shadow-sm);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.search-result-item:last-child {
    margin-bottom: 0;
}

.search-result-item:hover {
    background-color: var(--color-bg-tertiary);
    transform: translateX(4px);
    box-shadow: var(--shadow-md);
}

.result-song-name {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 6px;
}

.result-artist {
    font-size: 14px;
    color: var(--color-text-secondary);
    margin-bottom: 4px;
}

.result-album {
    font-size: 12px;
    color: var(--color-text-tertiary);
}

/* 结果容器 */
.result-container {
    display: none;
    animation: fadeInUp var(--duration-slow) var(--ease-out);
}

.music-info {
    display: flex;
    gap: 24px;
    margin-bottom: 24px;
    padding: 20px;
    background-color: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
}

.music-cover {
    width: 140px;
    height: 140px;
    border-radius: var(--radius-md);
    object-fit: cover;
    box-shadow: var(--shadow-md);
}

.music-details {
    flex: 1;
}

.music-details h2 {
    font-size: 22px;
    font-weight: 600;
    color: var(--color-text);
    margin: 0 0 12px 0;
}

.music-details p {
    margin: 8px 0;
    color: var(--color-text-secondary);
    font-size: 14px;
}

.music-details p strong {
    color: var(--color-text);
    margin-right: 4px;
}

/* 操作按钮组 */
.actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 16px;
    align-items: center;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--duration-fast) ease;
    text-decoration: none;
    font-family: inherit;
}

.btn-primary {
    background-color: var(--color-success);
    color: #fff;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    background-color: #059669;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: var(--color-bg-tertiary);
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    background-color: var(--color-bg-secondary);
    border-color: var(--color-primary);
    color: var(--color-primary);
    transform: translateY(-1px);
}

/* 歌单结果显示 */
.result-song-info {
    display: flex;
    align-items: center;
    gap: 12px;
    flex: 1;
    min-width: 0;
}

.result-song-cover {
    width: 40px;
    height: 40px;
    border-radius: 4px;
    object-fit: cover;
    flex-shrink: 0;
}

.result-song-details {
    min-width: 0;
    flex: 1;
}

/* 小型播放按钮 */
/* 歌曲操作按钮容器 */
.result-song-actions {
    display: flex;
    gap: 8px;
    align-items: center;
}

.play-btn-small {
    background: var(--color-primary);
    border: none;
    color: white;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
    flex-shrink: 0;
}

.play-btn-small:hover {
    background: var(--color-primary-hover);
    transform: scale(1.1);
}

.play-btn-small:disabled {
    background: var(--color-text-secondary);
    cursor: not-allowed;
    transform: none;
}

/* 下载按钮 - 绿色 */
.download-btn-small {
    background: var(--color-success);
    border: 1px solid var(--color-success);
    color: white;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
    flex-shrink: 0;
}

.download-btn-small:hover {
    background: #059669;
    border-color: #059669;
    color: white;
    transform: scale(1.1);
}

.download-btn-small:disabled {
    background: var(--color-bg-tertiary);
    color: var(--color-text-secondary);
    cursor: not-allowed;
    transform: none;
}

/* 搜索结果头部 */
.search-results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    border-bottom: 1px solid var(--color-border);
    background: var(--color-bg-secondary);
    font-weight: 600;
    color: var(--color-text);
}

/* 复选框标签 */
.checkbox-label {
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    font-size: 14px;
    color: var(--color-text-secondary);
    margin-left: 8px;
}

.checkbox-label input[type="checkbox"] {
    accent-color: var(--color-primary);
    cursor: pointer;
}

/* 播放器样式在 music-player.css 中定义 */

/* 歌词容器 */
.lyrics-container {
    max-height: 300px;
    overflow-y: auto;
    background-color: var(--color-bg-secondary);
    padding: 20px;
    border-radius: var(--radius-md);
    white-space: pre-wrap;
    font-family: 'SF Mono', monospace;
    font-size: 13px;
    line-height: 1.8;
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border);
}

/* Toast提示 */
.toast {
    position: fixed;
    top: 80px;
    right: 24px;
    min-width: 280px;
    max-width: 400px;
    padding: 14px 18px;
    border-radius: var(--radius-md);
    color: #fff;
    z-index: 1000;
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 14px;
    opacity: 0;
    transform: translateX(100%);
    transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    pointer-events: none;
}

.toast.show {
    opacity: 1;
    transform: translateX(0);
    pointer-events: auto;
}

.toast.info { background-color: var(--color-primary); }
.toast.success { background-color: var(--color-success); }
.toast.warning { background-color: var(--color-warning); }
.toast.error { background-color: var(--color-error); }

.toast .material-icons-round {
    font-size: 20px;
    flex-shrink: 0;
}

/* 动画 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

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

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(30px) scale(0.98);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideOutRight {
    from {
        opacity: 1;
        transform: translateX(0);
    }
    to {
        opacity: 0;
        transform: translateX(100%);
    }
}

/* 空状态 */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 48px 20px;
    text-align: center;
    color: var(--color-text-secondary);
}

.empty-state .material-icons-round {
    font-size: 48px;
    margin-bottom: 16px;
    opacity: 0.5;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .app-bar-content {
        padding: 12px 16px;
    }

    .app-bar-left { gap: 10px; }
    .app-title { font-size: 17px; }

    .back-btn {
        padding: 6px 10px;
        font-size: 13px;
    }

    .main-container { padding: 16px; }

    .card { padding: 16px; }

    .input-group {
        flex-direction: column;
        gap: 10px;
    }

    .text-input {
        border-radius: var(--radius-md);
    }

    .action-button {
        border-radius: var(--radius-md);
        width: 100%;
        justify-content: center;
    }

    .options-list {
        justify-content: center;
    }

    .music-info {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .music-cover {
        width: 120px;
        height: 120px;
    }

    .actions {
        flex-direction: column;
        align-items: stretch;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

    .toast {
        left: 16px;
        right: 16px;
        min-width: auto;
    }
}

@media (max-width: 480px) {
    .app-bar-content { padding: 10px 12px; }
    .app-title { font-size: 15px; }

    .back-btn {
        padding: 5px 8px;
        font-size: 12px;
    }

    .back-btn span:last-child { display: none; }
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track { background: var(--color-bg-secondary); }

::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover { background: var(--color-text-tertiary); }