:root{--bg:#f5f7fb;--panel:#fff;--panel-soft:#f8faff;--text:#172033;--muted:#7b8496;--line:#e7ebf3;--blue:#2f6bff;--blue-dark:#2457d6;--blue-soft:#eef4ff;--green:#12a97f;--green-soft:#eafaf5;--orange:#f59e0b;--orange-soft:#fff7e8;--red:#e34b4b;--red-soft:#fff1f1;--shadow:0 14px 40px rgba(19,32,61,.07);--shadow-soft:0 8px 22px rgba(19,32,61,.05);--radius:22px;--radius-sm:16px;--sidebar:230px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;line-height:1.65;font-size:15px}a{color:inherit;text-decoration:none}button,.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;border:0;border-radius:12px;background:var(--blue);color:#fff;padding:10px 16px;text-decoration:none;cursor:pointer;font-weight:650;line-height:1.4;transition:background .2s ease,transform .2s ease,box-shadow .2s 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