/* === 基础重置 / 滚动条 / 通用工具 === */

/* ---- 基础 ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
    width: 100%; height: 100%;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: 14px; line-height: 1.5;
    background: #f3f4f6; color: #111827;
    -webkit-font-smoothing: antialiased;
}

::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #cdd2da; border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: #a8b0bc; }

/* 侧边栏内更精致的滚动条 */
.sidebar-nav::-webkit-scrollbar { width: 4px; }
.sidebar-nav::-webkit-scrollbar-track { background: transparent; margin: 4px 0; }
.sidebar-nav::-webkit-scrollbar-thumb { background: #d0d5dd; border-radius: 4px; }
.sidebar-nav::-webkit-scrollbar-thumb:hover { background: #a5adba; }

::selection { background: rgba(74,158,255,0.2); }

.hidden { display: none !important; }