/* ==============================================
   设置系统：右上角设置入口 + 下拉菜单 + 开关按钮
   ============================================== */

/* 右上角设置入口 */
.sidebar-nav {
    position: fixed;
    right: 30px;
    top: 24px;
    z-index: 300;
}
.nav-item { position: relative; }
.menu-btn {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--glass-level-2);
    backdrop-filter: blur(var(--blur-medium)) saturate(170%);
    -webkit-backdrop-filter: blur(var(--blur-medium)) saturate(170%);
    border: 1px solid var(--glass-border-2);
    border-radius: var(--radius-pill);
    box-shadow: var(--shadow-soft), inset 0 1px 0 rgba(255, 255, 255, 0.3);
    cursor: pointer;
    user-select: none;
    overflow: hidden;
    opacity: 0.65;
    outline: none;
    -webkit-tap-highlight-color: transparent;
}
.menu-btn svg {
    width: 16px;
    height: 16px;
    stroke: var(--text-secondary);
    transition: stroke 0.3s ease, transform 0.4s var(--ease-ios);
}
.menu-btn:hover, .menu-btn:focus-visible, .menu-btn.active {
    opacity: 1;
    background: var(--glass-level-1);
    transform: translateY(-1px) scale(1.05);
    box-shadow: var(--shadow-elevated), inset 0 1px 0 rgba(255, 255, 255, 0.5);
    border-color: var(--glass-border-1);
}
.menu-btn:hover svg, .menu-btn:focus-visible svg, .menu-btn.active svg { stroke: #818cf8; }
.menu-btn.active svg { transform: rotate(90deg); }
.menu-btn:active { transform: translateY(0) scale(0.93); opacity: 0.7; }

/* 设置下拉弹窗 */
.dropdown {
    position: absolute;
    top: calc(100% + 10px);
    right: 0;
    min-width: 300px;
    max-width: calc(100vw - 40px);
    pointer-events: none;
    opacity: 0;
    visibility: hidden;
    clip-path: inset(0 0 calc(100% + 20px) calc(100% + 20px) round var(--radius-medium));
    transition: opacity var(--duration-fast) var(--ease-interrupt), clip-path var(--duration-slow) var(--ease-ios), visibility var(--duration-slow) linear;
    box-shadow: var(--shadow-elevated);
    border-radius: var(--radius-medium);
}
.dropdown.active {
    pointer-events: auto;
    opacity: 1;
    visibility: visible;
    clip-path: inset(0 0 0 0 round var(--radius-medium));
    transition: opacity var(--duration-fast) ease-out, clip-path var(--duration-slow) var(--ease-ios), visibility 0s linear;
}
.dropdown-content {
    background: var(--glass-level-1);
    backdrop-filter: blur(var(--blur-strong)) saturate(170%);
    -webkit-backdrop-filter: blur(var(--blur-strong)) saturate(170%);
    border: 1px solid var(--glass-border-1);
    border-radius: var(--radius-medium);
    padding: 20px 24px;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.3);
    pointer-events: auto;
    /* 小屏幕下内容可能超出视口高度，限制高度并允许滚动查看完整内容 */
    max-height: 80vh;
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
    touch-action: pan-y;
}

/* 菜单区块 */
.menu-section { padding: 12px 0; }
.menu-section + .menu-section { border-top: 1px solid var(--glass-border-3); }
.section-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
}
.section-icon {
    width: 18px;
    height: 18px;
    stroke: var(--text-tertiary);
    flex-shrink: 0;
}
.section-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
}
.section-desc {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* 设置行 */
.setting-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-left: 28px;
    padding-top: 4px;
    padding-bottom: 4px;
}
.setting-label {
    font-size: 14px;
    color: var(--text-secondary);
}

/* 折叠菜单行（用于液态玻璃效果，精致模式下才会弹出展开） */
.setting-row.collapsible {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    margin-top: 0 !important;
    padding-top: 0;
    padding-bottom: 0;
    transition: max-height 0.35s var(--ease-ios),
                opacity 0.3s ease,
                margin-top 0.35s var(--ease-ios),
                padding 0.35s var(--ease-ios);
    pointer-events: none;
}
.setting-row.collapsible.expanded {
    max-height: 40px;
    opacity: 1;
    margin-top: 8px !important;
    padding-top: 4px;
    padding-bottom: 4px;
    pointer-events: auto;
}

.switch-btn {
    position: relative;
    padding: 5px 14px;
    font-size: 13px;
    font-weight: 500;
    color: #818cf8;
    background: var(--glass-level-2);
    backdrop-filter: blur(var(--blur-medium)) saturate(170%);
    -webkit-backdrop-filter: blur(var(--blur-medium)) saturate(170%);
    border: 1px solid var(--glass-border-2);
    border-radius: var(--radius-pill);
    cursor: pointer;
    user-select: none;
    overflow: hidden;
    touch-action: manipulation;
    outline: none;
    -webkit-tap-highlight-color: transparent;
}
.switch-btn:hover, .switch-btn:focus-visible {
    background: var(--glass-level-1);
    transform: translateY(-1px);
    box-shadow: var(--shadow-soft);
}
.switch-btn:active { transform: scale(0.94); opacity: 0.7; }

/* Toast 提示 */
.copy-toast {
    position: fixed;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    padding: 10px 22px;
    background: var(--glass-level-1);
    border: 1px solid var(--glass-border-1);
    border-radius: var(--radius-pill);
    box-shadow: var(--shadow-normal), inset 0 1px 0 rgba(255, 255, 255, 0.4);
    font-size: 14px;
    color: var(--text-primary);
    opacity: 0;
    visibility: hidden;
    transition: all var(--duration-normal) var(--ease-ios);
    z-index: 9999;
    pointer-events: none;
}
.copy-toast.show { opacity: 1; visibility: visible; transform: translateX(-50%) translateY(0); }
.copy-toast.success { border-color: rgba(16, 185, 129, 0.5); }
.copy-toast.error { border-color: rgba(239, 68, 68, 0.5); color: var(--error-color); }

.guide-toast {
    position: fixed;
    top: 80px;
    right: 30px;
    padding: 10px 16px;
    background: var(--glass-level-1);
    border: 1px solid var(--glass-border-1);
    border-radius: 12px;
    box-shadow: var(--shadow-normal);
    font-size: 13px;
    color: var(--text-secondary);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--duration-normal) var(--ease-ios);
    z-index: 200;
    pointer-events: none;
}
.guide-toast.show { opacity: 1; visibility: visible; transform: translateY(0); }