:root{--bg-blackboard:#1a1a1a;--bg-blackboard-light:#242424;--bg-blackboard-lighter:#2d2d2d;--bg-card:rgba(255,255,255,0.03);--bg-card-hover:rgba(255,255,255,0.06);--bg-card-active:rgba(255,255,255,0.09);--bg-overlay:rgba(0,0,0,0.7);--chalk-white:#e8e2d5;--chalk-white-dim:#b0a99a;--chalk-yellow:#f5d76e;--chalk-yellow-dim:#c4a84a;--chalk-green:#8fce8f;--chalk-green-dim:#5fa05f;--chalk-blue:#7eb8e8;--chalk-blue-dim:#4e88b8;--chalk-purple:#c8a2e8;--chalk-purple-dim:#9872b8;--chalk-red:#e8706a;--chalk-red-dim:#b8403a;--chalk-orange:#e8a860;--chalk-gray:#8a8578;--chalk-gray-light:#a8a396;--border-light:rgba(255,255,255,0.08);--border-medium:rgba(255,255,255,0.15);--border-yellow:rgba(245,215,110,0.25);--border-green:rgba(143,206,143,0.25);--border-blue:rgba(126,184,232,0.25);--border-purple:rgba(200,162,232,0.25);--border-red:rgba(232,112,106,0.25);--font-sans:"PingFang SC","Microsoft YaHei","Hiragino Sans GB","Helvetica Neue",Arial,sans-serif;--font-serif:"Songti SC","SimSun","STSong",serif;--font-guji:"KaiTi","STKaiti","楷体",serif;--font-mono:"SF Mono","Monaco","Consolas",monospace;--text-xs:0.75rem;--text-sm:0.875rem;--text-base:1rem;--text-lg:1.125rem;--text-xl:1.25rem;--text-2xl:1.5rem;--text-3xl:1.875rem;--text-4xl:2.25rem;--leading-tight:1.4;--leading-normal:1.7;--leading-relaxed:2;--leading-loose:2.2;--space-0:0;--space-1:0.25rem;--space-2:0.5rem;--space-3:0.75rem;--space-4:1rem;--space-5:1.25rem;--space-6:1.5rem;--space-8:2rem;--space-10:2.5rem;--space-12:3rem;--space-16:4rem;--space-20:5rem;--radius-sm:4px;--radius-md:8px;--radius-lg:12px;--radius-xl:16px;--radius-full:9999px;--shadow-sm:0 1px 2px rgba(0,0,0,0.1);--shadow-md:0 4px 6px rgba(0,0,0,0.15);--shadow-lg:0 10px 15px rgba(0,0,0,0.2);--shadow-xl:0 20px 25px rgba(0,0,0,0.25);--transition-fast:0.15s ease;--transition-normal:0.25s ease;--transition-slow:0.4s ease;--container-max:1200px;--article-max:860px;--guji-max:720px;--sidebar-width:280px;--z-dropdown:100;--z-sticky:200;--z-overlay:300;--z-modal:400;--z-toast:500;--chalk-bg:var(--bg-blackboard);--chalk-card-bg:var(--bg-card);--chalk-border:var(--border-light);--chalk-text:var(--chalk-white);--chalk-dim:var(--chalk-white-dim);--chalk-accent:var(--chalk-yellow)}[data-theme="parchment"]{--bg-blackboard:#f5efe0;--bg-blackboard-light:#ede5d0;--bg-blackboard-lighter:#e5dcc0;--bg-card:rgba(0,0,0,0.03);--bg-card-hover:rgba(0,0,0,0.06);--bg-card-active:rgba(0,0,0,0.09);--chalk-white:#3a3530;--chalk-white-dim:#6a6560;--chalk-yellow:#b8860b;--chalk-green:#2e7d32;--chalk-blue:#1565c0;--chalk-purple:#6a1b9a;--chalk-red:#c62828;--chalk-gray:#8a8578;--border-light:rgba(0,0,0,0.08);--border-medium:rgba(0,0,0,0.15);--border-yellow:rgba(184,134,11,0.25)}