/* sidebar.css - 精简版 */
:root {
    --sidebar-width: 260px;
    --sidebar-mobile-width: 70vw;
    --sidebar-max-mobile: 280px;
    --sidebar-bg: #ffffff;
    --sidebar-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --sidebar-transition: transform 0.35s cubic-bezier(0.2, 0.9, 0.4, 1.1);
}

.sidebar {
    position: fixed;
    left: var(--container-padding-xs, 16px);
    bottom: 20px;
    width: var(--sidebar-width);
    background: var(--sidebar-bg);
    border-radius: 8px;
    border: 1px solid var(--border-color, #e0e0e0);
    box-shadow: var(--sidebar-shadow);
    z-index: 1001;
    transform: translateX(calc(-100% - var(--container-padding-xs, 16px)));
    transition: var(--sidebar-transition);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}
.sidebar.active { transform: translateX(0); }

.sidebar-wallpaper {
    position: relative;
    width: 100%;
    aspect-ratio: 16/9;
    background-size: cover;
    background-position: center;
    border-radius: 8px 8px 0 0;
    flex-shrink: 0;
    overflow: hidden;
}
.sidebar-wallpaper-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to bottom, rgba(0,0,0,0.1) 0%, rgba(0,0,0,0.2) 100%);
    pointer-events: none;
}
.sidebar-wallpaper-user-info {
    position: absolute;
    left: 16px;
    bottom: 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    color: #fff;
    text-shadow: 0 1px 3px rgba(0,0,0,0.4);
    z-index: 2;
    max-width: calc(100% - 32px);
    pointer-events: auto;
}
.sidebar-wallpaper-avatar {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    border: 2px solid rgba(255,255,255,0.4);
    overflow: hidden;
    background: rgba(0,0,0,0.2);
    flex-shrink: 0;
    cursor: pointer;
    transition: transform 0.2s ease;
}
.sidebar-wallpaper-avatar:hover { transform: scale(1.02); }
.sidebar-wallpaper-avatar img { width: 100%; height: 100%; object-fit: cover; }
.sidebar-wallpaper-user-text { flex: 1; min-width: 0; }
.sidebar-wallpaper-nickname {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 4px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.sidebar-wallpaper-signature {
    font-size: 12px;
    opacity: 0.9;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.daily-quote-card {
    margin: 12px 16px;
    padding: 0;
    background: var(--bg-card, #ffffff);
    border-radius: 8px;
}
.daily-quote-card p {
    font-size: 12px;
    line-height: 1.4;
    color: var(--text-primary, #1e293b);
    margin: 0;
    text-align: center;
    font-style: italic;
}

.sidebar-categories {
    flex: 1;
    overflow-y: auto;
    padding: 0 12px 8px;
    scrollbar-width: none;
    -ms-overflow-style: none;
}
.sidebar-categories::-webkit-scrollbar { display: none; }

.category-group {
    margin-bottom: 12px;
    background: var(--bg-card, #ffffff);
    border-radius: 8px;
    border: 1px solid var(--border-color, #e0e0e0);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    overflow: hidden;
    transition: all 0.2s ease;
}
.category-group-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 14px;
    cursor: pointer;
    user-select: none;
    transition: background 0.2s;
}
.category-group-header:hover { background: rgba(67,97,238,0.08); }
.category-name {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary, #1e293b);
}
.category-name i { width: 20px; color: var(--primary-color, #4361ee); font-size: 14px; }
.category-toggle {
    width: 28px; height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    background: transparent;
    color: var(--text-secondary, #6c757d);
    cursor: pointer;
    transition: transform 0.25s ease;
    border-radius: 50%;
}
.category-toggle:hover { background: rgba(0,0,0,0.05); }
.category-group.expanded .category-toggle { transform: rotate(180deg); }

.category-items {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
}
.category-group.expanded .category-items {
    max-height: 400px;
    overflow-y: auto;
}
.category-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 16px 10px 44px;
    width: 100%;
    border: none;
    background: transparent;
    cursor: pointer;
    font-size: 13px;
    color: var(--text-primary, #334155);
    transition: all 0.2s ease;
    text-align: left;
    border-radius: 0;
    margin: 2px 0;
}
.category-item:hover {
    background: rgba(67,97,238,0.12);
    color: var(--primary-color, #4361ee);
    padding-left: 48px;
}
.category-item i { width: 18px; font-size: 13px; color: currentColor; }

.sidebar-footer {
    padding: 12px 16px;
    border-top: 1px solid var(--border-color, #e0e0e0);
    display: flex;
    justify-content: space-around;
    gap: 12px;
    background: var(--bg-card, #ffffff);
    flex-shrink: 0;
}
.footer-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 8px 0;
    background: var(--bg-card, #ffffff);
    border: 1px solid var(--border-color, #e0e0e0);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 20px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.08);
}
.footer-btn i { font-size: 20px; }
.footer-btn:hover {
    background: rgba(67,97,238,0.1);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.12);
}
.footer-btn[data-action="notebook"] { color: #8b5cf6; }
.footer-btn[data-action="notebook"]:hover { background: rgba(139,92,246,0.15); color: #7c3aed; }
.footer-btn[data-action="about"] { color: #ec4899; }
.footer-btn[data-action="about"]:hover { background: rgba(236,72,153,0.15); color: #db2777; }
.footer-btn[data-action="qq"] { color: #3b82f6; }
.footer-btn[data-action="qq"]:hover { background: rgba(59,130,246,0.15); color: #2563eb; }

/* 位置响应式 */
@media (min-width:576px) { .sidebar { left: var(--container-padding-sm, 20px); transform: translateX(calc(-100% - var(--container-padding-sm, 20px))); } }
@media (min-width:768px) { .sidebar { left: var(--container-padding-md, 24px); transform: translateX(calc(-100% - var(--container-padding-md, 24px))); } }
@media (min-width:992px) { .sidebar { left: var(--container-padding-lg, 28px); transform: translateX(calc(-100% - var(--container-padding-lg, 28px))); } }
@media (min-width:1200px) { .sidebar { left: var(--container-padding-xl, 32px); transform: translateX(calc(-100% - var(--container-padding-xl, 32px))); } }

@media (max-width:768px) {
    .sidebar {
        width: var(--sidebar-mobile-width);
        max-width: var(--sidebar-max-mobile);
        left: var(--container-padding-xs, 16px);
        transform: translateX(calc(-100% - var(--container-padding-xs, 16px)));
    }
    .sidebar-wallpaper-avatar { width: 48px; height: 48px; }
    .sidebar-wallpaper-nickname { font-size: 16px; }
    .sidebar-wallpaper-signature { font-size: 11px; }
    .category-name { font-size: 13px; }
    .category-item { padding: 9px 14px 9px 40px; font-size: 12px; }
    .footer-btn i { font-size: 18px; }
    .footer-btn { padding: 6px 0; }
}
@media (max-width:480px) {
    .sidebar-wallpaper-user-info { left: 12px; bottom: 12px; gap: 8px; }
    .sidebar-wallpaper-avatar { width: 42px; height: 42px; }
    .daily-quote-card { margin: 8px 12px; }
    .daily-quote-card p { font-size: 11px; }
    .sidebar-wallpaper-nickname { font-size: 14px; }
    .sidebar-wallpaper-signature { font-size: 10px; }
}
@media (max-height:500px) and (orientation:landscape) {
    .sidebar { top: 60px !important; bottom: 10px; }
    .sidebar-wallpaper { aspect-ratio: 21/9; }
    .daily-quote-card { display: none; }
}

@media (prefers-reduced-motion:reduce) {
    .sidebar, .category-group-header, .category-item, .footer-btn, .category-toggle, .category-items {
        transition: none; animation: none;
    }
}

/* 深色模式 */
.dark-mode .sidebar {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    box-shadow: 0 25px 50px -12px rgba(0,0,0,0.5);
}
.dark-mode .daily-quote-card { background: var(--bg-secondary); }
.dark-mode .daily-quote-card p { color: var(--text-primary); }
.dark-mode .category-group {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 4px rgba(0,0,0,0.3);
}
.dark-mode .category-group-header:hover { background: rgba(67,97,238,0.2); }
.dark-mode .category-name { color: var(--text-primary); }
.dark-mode .category-name i { color: var(--primary-color); }
.dark-mode .category-toggle { color: var(--text-secondary); }
.dark-mode .category-toggle:hover { background: rgba(255,255,255,0.1); }
.dark-mode .category-item { color: var(--text-primary); }
.dark-mode .category-item:hover { background: rgba(67,97,238,0.25); color: var(--primary-color); }
.dark-mode .sidebar-footer {
    background: var(--bg-secondary);
    border-top-color: var(--border-color);
}
.dark-mode .footer-btn {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 4px rgba(0,0,0,0.3);
}
.dark-mode .footer-btn:hover { background: rgba(67,97,238,0.2); }
.dark-mode .footer-btn[data-action="notebook"] { color: #a78bfa; }
.dark-mode .footer-btn[data-action="notebook"]:hover { color: #c4b5fd; }
.dark-mode .footer-btn[data-action="about"] { color: #f472b6; }
.dark-mode .footer-btn[data-action="about"]:hover { color: #f9a8d4; }
.dark-mode .footer-btn[data-action="qq"] { color: #60a5fa; }
.dark-mode .footer-btn[data-action="qq"]:hover { color: #93c5fd; }